interesting
/
go-ethereum
mirror of https://github.com/ethereum/go-ethereum.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Merge pull request #2885 from bas-vk/subscriptions 

rpc: refactor subscriptions and filters
This commit is contained in:
Felix Lange 2016-08-17 17:14:42 +02:00 committed by GitHub
parent 3b39d4d1c1 47ff813012
commit 3369783e0a
15 changed files with 1304 additions and 1255 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
core/types/block.go
View File

@ -114,6 +114,28 @@ func (h *Header) UnmarshalJSON(data []byte) error {
return nil
}
func (h *Header) MarshalJSON() ([]byte, error) {
fields := map[string]interface{}{
"hash": h.Hash(),
"parentHash": h.ParentHash,
"number": fmt.Sprintf("%#x", h.Number),
"nonce": h.Nonce,
"receiptRoot": h.ReceiptHash,
"logsBloom": h.Bloom,
"sha3Uncles": h.UncleHash,
"stateRoot": h.Root,
"miner": h.Coinbase,
"difficulty": fmt.Sprintf("%#x", h.Difficulty),
"extraData": fmt.Sprintf("0x%x", h.Extra),
"gasLimit": fmt.Sprintf("%#x", h.GasLimit),
"gasUsed": fmt.Sprintf("%#x", h.GasUsed),
"timestamp": fmt.Sprintf("%#x", h.Time),
"transactionsRoot": h.TxHash,
}
return json.Marshal(fields)
}
func rlpHash(x interface{}) (h common.Hash) {
hw := sha3.NewKeccak256()
rlp.Encode(hw, x)

143
eth/downloader/api.go
View File

@ -19,10 +19,9 @@ package downloader
import (
"sync"
"golang.org/x/net/context"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/rpc"
"golang.org/x/net/context"
)
// PublicDownloaderAPI provides an API which gives information about the current synchronisation status.
@ -30,25 +29,48 @@ import (
type PublicDownloaderAPI struct {
d *Downloader
mux *event.TypeMux
muSyncSubscriptions sync.Mutex
syncSubscriptions map[string]rpc.Subscription
installSyncSubscription chan chan interface{}
uninstallSyncSubscription chan *uninstallSyncSubscriptionRequest
}
// NewPublicDownloaderAPI create a new PublicDownloaderAPI.
// NewPublicDownloaderAPI create a new PublicDownloaderAPI. The API has an internal event loop that
// listens for events from the downloader through the global event mux. In case it receives one of
// these events it broadcasts it to all syncing subscriptions that are installed through the
// installSyncSubscription channel.
func NewPublicDownloaderAPI(d *Downloader, m *event.TypeMux) *PublicDownloaderAPI {
api := &PublicDownloaderAPI{d: d, mux: m, syncSubscriptions: make(map[string]rpc.Subscription)}
api := &PublicDownloaderAPI{
d: d,
mux: m,
installSyncSubscription: make(chan chan interface{}),
uninstallSyncSubscription: make(chan *uninstallSyncSubscriptionRequest),
}
go api.run()
go api.eventLoop()
return api
}
func (api *PublicDownloaderAPI) run() {
sub := api.mux.Subscribe(StartEvent{}, DoneEvent{}, FailedEvent{})
// eventLoop runs an loop until the event mux closes. It will install and uninstall new
// sync subscriptions and broadcasts sync status updates to the installed sync subscriptions.
func (api *PublicDownloaderAPI) eventLoop() {
var (
sub = api.mux.Subscribe(StartEvent{}, DoneEvent{}, FailedEvent{})
syncSubscriptions = make(map[chan interface{}]struct{})
)
for {
select {
case i := <-api.installSyncSubscription:
syncSubscriptions[i] = struct{}{}
case u := <-api.uninstallSyncSubscription:
delete(syncSubscriptions, u.c)
close(u.uninstalled)
case event := <-sub.Chan():
if event == nil {
return
}
for event := range sub.Chan() {
var notification interface{}
switch event.Data.(type) {
case StartEvent:
result := &SyncingResult{Syncing: true}
@ -57,15 +79,42 @@ func (api *PublicDownloaderAPI) run() {
case DoneEvent, FailedEvent:
notification = false
}
// broadcast
for c := range syncSubscriptions {
c <- notification
}
}
}
}
api.muSyncSubscriptions.Lock()
for id, sub := range api.syncSubscriptions {
if sub.Notify(notification) == rpc.ErrNotificationNotFound {
delete(api.syncSubscriptions, id)
// Syncing provides information when this nodes starts synchronising with the Ethereum network and when it's finished.
func (api *PublicDownloaderAPI) Syncing(ctx context.Context) (*rpc.Subscription, error) {
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return &rpc.Subscription{}, rpc.ErrNotificationsUnsupported
}
rpcSub := notifier.CreateSubscription()
go func() {
statuses := make(chan interface{})
sub := api.SubscribeSyncStatus(statuses)
for {
select {
case status := <-statuses:
notifier.Notify(rpcSub.ID, status)
case <-rpcSub.Err():
sub.Unsubscribe()
return
case <-notifier.Closed():
sub.Unsubscribe()
return
}
}
api.muSyncSubscriptions.Unlock()
}
}()
return rpcSub, nil
}
// Progress gives progress indications when the node is synchronising with the Ethereum network.
@ -83,26 +132,42 @@ type SyncingResult struct {
Status Progress `json:"status"`
}
// Syncing provides information when this nodes starts synchronising with the Ethereum network and when it's finished.
func (api *PublicDownloaderAPI) Syncing(ctx context.Context) (rpc.Subscription, error) {
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return nil, rpc.ErrNotificationsUnsupported
}
subscription, err := notifier.NewSubscription(func(id string) {
api.muSyncSubscriptions.Lock()
delete(api.syncSubscriptions, id)
api.muSyncSubscriptions.Unlock()
})
if err != nil {
return nil, err
}
api.muSyncSubscriptions.Lock()
api.syncSubscriptions[subscription.ID()] = subscription
api.muSyncSubscriptions.Unlock()
return subscription, nil
// uninstallSyncSubscriptionRequest uninstalles a syncing subscription in the API event loop.
type uninstallSyncSubscriptionRequest struct {
c chan interface{}
uninstalled chan interface{}
}
// SyncStatusSubscription represents a syncing subscription.
type SyncStatusSubscription struct {
api *PublicDownloaderAPI // register subscription in event loop of this api instance
c chan interface{} // channel where events are broadcasted to
unsubOnce sync.Once // make sure unsubscribe logic is executed once
}
// Unsubscribe uninstalls the subscription from the DownloadAPI event loop.
// The status channel that was passed to subscribeSyncStatus isn't used anymore
// after this method returns.
func (s *SyncStatusSubscription) Unsubscribe() {
s.unsubOnce.Do(func() {
req := uninstallSyncSubscriptionRequest{s.c, make(chan interface{})}
s.api.uninstallSyncSubscription <- &req
for {
select {
case <-s.c:
// drop new status events until uninstall confirmation
continue
case <-req.uninstalled:
return
}
}
})
}
// SubscribeSyncStatus creates a subscription that will broadcast new synchronisation updates.
// The given channel must receive interface values, the result can either
func (api *PublicDownloaderAPI) SubscribeSyncStatus(status chan interface{}) *SyncStatusSubscription {
api.installSyncSubscription <- status
return &SyncStatusSubscription{api: api, c: status}
}

792
eth/filters/api.go
View File

@ -17,292 +17,414 @@
package filters
import (
"crypto/rand"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"math/big"
"sync"
"time"
"golang.org/x/net/context"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/rpc"
"golang.org/x/net/context"
)
var (
filterTickerTime = 5 * time.Minute
deadline = 5 * time.Minute // consider a filter inactive if it has not been polled for within deadline
)
// byte will be inferred
const (
unknownFilterTy = iota
blockFilterTy
transactionFilterTy
logFilterTy
)
// filter is a helper struct that holds meta information over the filter type
// and associated subscription in the event system.
type filter struct {
typ Type
deadline *time.Timer // filter is inactiv when deadline triggers
hashes []common.Hash
crit FilterCriteria
logs []Log
s *Subscription // associated subscription in event system
}
// PublicFilterAPI offers support to create and manage filters. This will allow external clients to retrieve various
// information related to the Ethereum protocol such als blocks, transactions and logs.
type PublicFilterAPI struct {
mux *event.TypeMux
quit chan struct{}
chainDb ethdb.Database
filterManager *FilterSystem
filterMapMu sync.RWMutex
filterMapping map[string]int // maps between filter internal filter identifiers and external filter identifiers
logMu sync.RWMutex
logQueue map[int]*logQueue
blockMu sync.RWMutex
blockQueue map[int]*hashQueue
transactionMu sync.RWMutex
transactionQueue map[int]*hashQueue
events *EventSystem
filtersMu sync.Mutex
filters map[rpc.ID]*filter
}
// NewPublicFilterAPI returns a new PublicFilterAPI instance.
func NewPublicFilterAPI(chainDb ethdb.Database, mux *event.TypeMux) *PublicFilterAPI {
svc := &PublicFilterAPI{
api := &PublicFilterAPI{
mux: mux,
chainDb: chainDb,
filterManager: NewFilterSystem(mux),
filterMapping: make(map[string]int),
logQueue: make(map[int]*logQueue),
blockQueue: make(map[int]*hashQueue),
transactionQueue: make(map[int]*hashQueue),
events: NewEventSystem(mux),
filters: make(map[rpc.ID]*filter),
}
go svc.start()
return svc
go api.timeoutLoop()
return api
}
// Stop quits the work loop.
func (s *PublicFilterAPI) Stop() {
close(s.quit)
// timeoutLoop runs every 5 minutes and deletes filters that have not been recently used.
// Tt is started when the api is created.
func (api *PublicFilterAPI) timeoutLoop() {
ticker := time.NewTicker(5 * time.Minute)
for {
<-ticker.C
api.filtersMu.Lock()
for id, f := range api.filters {
select {
case <-f.deadline.C:
f.s.Unsubscribe()
delete(api.filters, id)
default:
continue
}
}
api.filtersMu.Unlock()
}
}
// start the work loop, wait and process events.
func (s *PublicFilterAPI) start() {
timer := time.NewTicker(2 * time.Second)
defer timer.Stop()
done:
// NewPendingTransactionFilter creates a filter that fetches pending transaction hashes
// as transactions enter the pending state.
//
// It is part of the filter package because this filter can be used throug the
// `eth_getFilterChanges` polling method that is also used for log filters.
//
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_newpendingtransactionfilter
func (api *PublicFilterAPI) NewPendingTransactionFilter() rpc.ID {
var (
pendingTxs = make(chan common.Hash)
pendingTxSub = api.events.SubscribePendingTxEvents(pendingTxs)
)
api.filtersMu.Lock()
api.filters[pendingTxSub.ID] = &filter{typ: PendingTransactionsSubscription, deadline: time.NewTimer(deadline), hashes: make([]common.Hash, 0), s: pendingTxSub}
api.filtersMu.Unlock()
go func() {
for {
select {
case <-timer.C:
s.filterManager.Lock() // lock order like filterLoop()
s.logMu.Lock()
for id, filter := range s.logQueue {
if time.Since(filter.timeout) > filterTickerTime {
s.filterManager.Remove(id)
delete(s.logQueue, id)
}
}
s.logMu.Unlock()
s.blockMu.Lock()
for id, filter := range s.blockQueue {
if time.Since(filter.timeout) > filterTickerTime {
s.filterManager.Remove(id)
delete(s.blockQueue, id)
}
}
s.blockMu.Unlock()
s.transactionMu.Lock()
for id, filter := range s.transactionQueue {
if time.Since(filter.timeout) > filterTickerTime {
s.filterManager.Remove(id)
delete(s.transactionQueue, id)
}
}
s.transactionMu.Unlock()
s.filterManager.Unlock()
case <-s.quit:
break done
case ph := <-pendingTxs:
api.filtersMu.Lock()
if f, found := api.filters[pendingTxSub.ID]; found {
f.hashes = append(f.hashes, ph)
}
api.filtersMu.Unlock()
case <-pendingTxSub.Err():
api.filtersMu.Lock()
delete(api.filters, pendingTxSub.ID)
api.filtersMu.Unlock()
return
}
}
}()
return pendingTxSub.ID
}
// NewBlockFilter create a new filter that returns blocks that are included into the canonical chain.
func (s *PublicFilterAPI) NewBlockFilter() (string, error) {
// protect filterManager.Add() and setting of filter fields
s.filterManager.Lock()
defer s.filterManager.Unlock()
externalId, err := newFilterId()
if err != nil {
return "", err
// NewPendingTransactions creates a subscription that is triggered each time a transaction
// enters the transaction pool and was signed from one of the transactions this nodes manages.
func (api *PublicFilterAPI) NewPendingTransactions(ctx context.Context) (*rpc.Subscription, error) {
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return &rpc.Subscription{}, rpc.ErrNotificationsUnsupported
}
filter := New(s.chainDb)
id, err := s.filterManager.Add(filter, ChainFilter)
if err != nil {
return "", err
}
rpcSub := notifier.CreateSubscription()
s.blockMu.Lock()
s.blockQueue[id] = &hashQueue{timeout: time.Now()}
s.blockMu.Unlock()
go func() {
txHashes := make(chan common.Hash)
pendingTxSub := api.events.SubscribePendingTxEvents(txHashes)
filter.BlockCallback = func(block *types.Block, logs vm.Logs) {
s.blockMu.Lock()
defer s.blockMu.Unlock()
if queue := s.blockQueue[id]; queue != nil {
queue.add(block.Hash())
for {
select {
case h := <-txHashes:
notifier.Notify(rpcSub.ID, h)
case <-rpcSub.Err():
pendingTxSub.Unsubscribe()
return
case <-notifier.Closed():
pendingTxSub.Unsubscribe()
return
}
}
}()
s.filterMapMu.Lock()
s.filterMapping[externalId] = id
s.filterMapMu.Unlock()
return externalId, nil
return rpcSub, nil
}
// NewPendingTransactionFilter creates a filter that returns new pending transactions.
func (s *PublicFilterAPI) NewPendingTransactionFilter() (string, error) {
// protect filterManager.Add() and setting of filter fields
s.filterManager.Lock()
defer s.filterManager.Unlock()
// NewBlockFilter creates a filter that fetches blocks that are imported into the chain.
// It is part of the filter package since polling goes with eth_getFilterChanges.
//
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_newblockfilter
func (api *PublicFilterAPI) NewBlockFilter() rpc.ID {
var (
headers = make(chan *types.Header)
headerSub = api.events.SubscribeNewHeads(headers)
)
externalId, err := newFilterId()
if err != nil {
return "", err
api.filtersMu.Lock()
api.filters[headerSub.ID] = &filter{typ: BlocksSubscription, deadline: time.NewTimer(deadline), hashes: make([]common.Hash, 0), s: headerSub}
api.filtersMu.Unlock()
go func() {
for {
select {
case h := <-headers:
api.filtersMu.Lock()
if f, found := api.filters[headerSub.ID]; found {
f.hashes = append(f.hashes, h.Hash())
}
filter := New(s.chainDb)
id, err := s.filterManager.Add(filter, PendingTxFilter)
if err != nil {
return "", err
}
s.transactionMu.Lock()
s.transactionQueue[id] = &hashQueue{timeout: time.Now()}
s.transactionMu.Unlock()
filter.TransactionCallback = func(tx *types.Transaction) {
s.transactionMu.Lock()
defer s.transactionMu.Unlock()
if queue := s.transactionQueue[id]; queue != nil {
queue.add(tx.Hash())
api.filtersMu.Unlock()
case <-headerSub.Err():
api.filtersMu.Lock()
delete(api.filters, headerSub.ID)
api.filtersMu.Unlock()
return
}
}
}()
s.filterMapMu.Lock()
s.filterMapping[externalId] = id
s.filterMapMu.Unlock()
return externalId, nil
return headerSub.ID
}
// newLogFilter creates a new log filter.
func (s *PublicFilterAPI) newLogFilter(earliest, latest int64, addresses []common.Address, topics [][]common.Hash, callback func(log *vm.Log, removed bool)) (int, error) {
// protect filterManager.Add() and setting of filter fields
s.filterManager.Lock()
defer s.filterManager.Unlock()
filter := New(s.chainDb)
id, err := s.filterManager.Add(filter, LogFilter)
if err != nil {
return 0, err
// NewHeads send a notification each time a new (header) block is appended to the chain.
func (api *PublicFilterAPI) NewHeads(ctx context.Context) (*rpc.Subscription, error) {
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return &rpc.Subscription{}, rpc.ErrNotificationsUnsupported
}
s.logMu.Lock()
s.logQueue[id] = &logQueue{timeout: time.Now()}
s.logMu.Unlock()
rpcSub := notifier.CreateSubscription()
filter.SetBeginBlock(earliest)
filter.SetEndBlock(latest)
filter.SetAddresses(addresses)
filter.SetTopics(topics)
filter.LogCallback = func(log *vm.Log, removed bool) {
if callback != nil {
callback(log, removed)
} else {
s.logMu.Lock()
defer s.logMu.Unlock()
if queue := s.logQueue[id]; queue != nil {
queue.add(vmlog{log, removed})
}
}
}
go func() {
headers := make(chan *types.Header)
headersSub := api.events.SubscribeNewHeads(headers)
return id, nil
for {
select {
case h := <-headers:
notifier.Notify(rpcSub.ID, h)
case <-rpcSub.Err():
headersSub.Unsubscribe()
return
case <-notifier.Closed():
headersSub.Unsubscribe()
return
}
}
}()
return rpcSub, nil
}
// Logs creates a subscription that fires for all new log that match the given filter criteria.
func (s *PublicFilterAPI) Logs(ctx context.Context, args NewFilterArgs) (rpc.Subscription, error) {
func (api *PublicFilterAPI) Logs(ctx context.Context, crit FilterCriteria) (*rpc.Subscription, error) {
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return nil, rpc.ErrNotificationsUnsupported
return &rpc.Subscription{}, rpc.ErrNotificationsUnsupported
}
var (
externalId string
subscription rpc.Subscription
err error
)
rpcSub := notifier.CreateSubscription()
if externalId, err = newFilterId(); err != nil {
return nil, err
go func() {
matchedLogs := make(chan []Log)
logsSub := api.events.SubscribeLogs(crit, matchedLogs)
for {
select {
case logs := <-matchedLogs:
for _, log := range logs {
notifier.Notify(rpcSub.ID, &log)
}
// uninstall filter when subscription is unsubscribed/cancelled
if subscription, err = notifier.NewSubscription(func(string) {
s.UninstallFilter(externalId)
}); err != nil {
return nil, err
}
notifySubscriber := func(log *vm.Log, removed bool) {
rpcLog := toRPCLogs(vm.Logs{log}, removed)
if err := subscription.Notify(rpcLog); err != nil {
subscription.Cancel()
case <-rpcSub.Err(): // client send an unsubscribe request
logsSub.Unsubscribe()
return
case <-notifier.Closed(): // connection dropped
logsSub.Unsubscribe()
return
}
}
}()
// from and to block number are not used since subscriptions don't allow you to travel to "time"
var id int
if len(args.Addresses) > 0 {
id, err = s.newLogFilter(-1, -1, args.Addresses, args.Topics, notifySubscriber)
} else {
id, err = s.newLogFilter(-1, -1, nil, args.Topics, notifySubscriber)
}
if err != nil {
subscription.Cancel()
return nil, err
}
s.filterMapMu.Lock()
s.filterMapping[externalId] = id
s.filterMapMu.Unlock()
return subscription, err
return rpcSub, nil
}
// NewFilterArgs represents a request to create a new filter.
type NewFilterArgs struct {
FromBlock rpc.BlockNumber
ToBlock rpc.BlockNumber
// FilterCriteria represents a request to create a new filter.
type FilterCriteria struct {
FromBlock *big.Int
ToBlock *big.Int
Addresses []common.Address
Topics [][]common.Hash
}
// NewFilter creates a new filter and returns the filter id. It can be
// used to retrieve logs when the state changes. This method cannot be
// used to fetch logs that are already stored in the state.
//
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_newfilter
func (api *PublicFilterAPI) NewFilter(crit FilterCriteria) rpc.ID {
var (
logs = make(chan []Log)
logsSub = api.events.SubscribeLogs(crit, logs)
)
if crit.FromBlock == nil {
crit.FromBlock = big.NewInt(rpc.LatestBlockNumber.Int64())
}
if crit.ToBlock == nil {
crit.ToBlock = big.NewInt(rpc.LatestBlockNumber.Int64())
}
api.filtersMu.Lock()
api.filters[logsSub.ID] = &filter{typ: LogsSubscription, crit: crit, deadline: time.NewTimer(deadline), logs: make([]Log, 0), s: logsSub}
api.filtersMu.Unlock()
go func() {
for {
select {
case l := <-logs:
api.filtersMu.Lock()
if f, found := api.filters[logsSub.ID]; found {
f.logs = append(f.logs, l...)
}
api.filtersMu.Unlock()
case <-logsSub.Err():
api.filtersMu.Lock()
delete(api.filters, logsSub.ID)
api.filtersMu.Unlock()
return
}
}
}()
return logsSub.ID
}
// GetLogs returns logs matching the given argument that are stored within the state.
//
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getlogs
func (api *PublicFilterAPI) GetLogs(crit FilterCriteria) []Log {
if crit.FromBlock == nil {
crit.FromBlock = big.NewInt(rpc.LatestBlockNumber.Int64())
}
if crit.ToBlock == nil {
crit.ToBlock = big.NewInt(rpc.LatestBlockNumber.Int64())
}
filter := New(api.chainDb)
filter.SetBeginBlock(crit.FromBlock.Int64())
filter.SetEndBlock(crit.ToBlock.Int64())
filter.SetAddresses(crit.Addresses)
filter.SetTopics(crit.Topics)
return returnLogs(filter.Find())
}
// UninstallFilter removes the filter with the given filter id.
//
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_uninstallfilter
func (api *PublicFilterAPI) UninstallFilter(id rpc.ID) bool {
api.filtersMu.Lock()
f, found := api.filters[id]
if found {
delete(api.filters, id)
}
api.filtersMu.Unlock()
if found {
f.s.Unsubscribe()
}
return found
}
// GetFilterLogs returns the logs for the filter with the given id.
// If the filter could not be found an empty array of logs is returned.
//
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getfilterlogs
func (api *PublicFilterAPI) GetFilterLogs(id rpc.ID) []Log {
api.filtersMu.Lock()
f, found := api.filters[id]
api.filtersMu.Unlock()
if !found || f.typ != LogsSubscription {
return []Log{}
}
filter := New(api.chainDb)
filter.SetBeginBlock(f.crit.FromBlock.Int64())
filter.SetEndBlock(f.crit.ToBlock.Int64())
filter.SetAddresses(f.crit.Addresses)
filter.SetTopics(f.crit.Topics)
return returnLogs(filter.Find())
}
// GetFilterChanges returns the logs for the filter with the given id since
// last time is was called. This can be used for polling.
//
// For pending transaction and block filters the result is []common.Hash.
// (pending)Log filters return []Log. If the filter could not be found
// []interface{}{} is returned.
//
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getfilterchanges
func (api *PublicFilterAPI) GetFilterChanges(id rpc.ID) interface{} {
api.filtersMu.Lock()
defer api.filtersMu.Unlock()
if f, found := api.filters[id]; found {
if !f.deadline.Stop() {
// timer expired but filter is not yet removed in timeout loop
// receive timer value and reset timer
<-f.deadline.C
}
f.deadline.Reset(deadline)
switch f.typ {
case PendingTransactionsSubscription, BlocksSubscription:
hashes := f.hashes
f.hashes = nil
return returnHashes(hashes)
case PendingLogsSubscription, LogsSubscription:
logs := f.logs
f.logs = nil
return returnLogs(logs)
}
}
return []interface{}{}
}
// returnHashes is a helper that will return an empty hash array case the given hash array is nil,
// otherwise the given hashes array is returned.
func returnHashes(hashes []common.Hash) []common.Hash {
if hashes == nil {
return []common.Hash{}
}
return hashes
}
// returnLogs is a helper that will return an empty log array in case the given logs array is nil,
// otherwise the given logs array is returned.
func returnLogs(logs []Log) []Log {
if logs == nil {
return []Log{}
}
return logs
}
// UnmarshalJSON sets *args fields with given data.
func (args *NewFilterArgs) UnmarshalJSON(data []byte) error {
func (args *FilterCriteria) UnmarshalJSON(data []byte) error {
type input struct {
From *rpc.BlockNumber `json:"fromBlock"`
ToBlock *rpc.BlockNumber `json:"toBlock"`
@ -316,15 +438,15 @@ func (args *NewFilterArgs) UnmarshalJSON(data []byte) error {
}
if raw.From == nil || raw.From.Int64() < 0 {
args.FromBlock = rpc.LatestBlockNumber
args.FromBlock = big.NewInt(rpc.LatestBlockNumber.Int64())
} else {
args.FromBlock = *raw.From
args.FromBlock = big.NewInt(raw.From.Int64())
}
if raw.ToBlock == nil || raw.ToBlock.Int64() < 0 {
args.ToBlock = rpc.LatestBlockNumber
args.ToBlock = big.NewInt(rpc.LatestBlockNumber.Int64())
} else {
args.ToBlock = *raw.ToBlock
args.ToBlock = big.NewInt(raw.ToBlock.Int64())
}
args.Addresses = []common.Address{}
@ -414,255 +536,3 @@ func (args *NewFilterArgs) UnmarshalJSON(data []byte) error {
return nil
}
// NewFilter creates a new filter and returns the filter id. It can be uses to retrieve logs.
func (s *PublicFilterAPI) NewFilter(args NewFilterArgs) (string, error) {
externalId, err := newFilterId()
if err != nil {
return "", err
}
var id int
if len(args.Addresses) > 0 {
id, err = s.newLogFilter(args.FromBlock.Int64(), args.ToBlock.Int64(), args.Addresses, args.Topics, nil)
} else {
id, err = s.newLogFilter(args.FromBlock.Int64(), args.ToBlock.Int64(), nil, args.Topics, nil)
}
if err != nil {
return "", err
}
s.filterMapMu.Lock()
s.filterMapping[externalId] = id
s.filterMapMu.Unlock()
return externalId, nil
}
// GetLogs returns the logs matching the given argument.
func (s *PublicFilterAPI) GetLogs(args NewFilterArgs) []vmlog {
filter := New(s.chainDb)
filter.SetBeginBlock(args.FromBlock.Int64())
filter.SetEndBlock(args.ToBlock.Int64())
filter.SetAddresses(args.Addresses)
filter.SetTopics(args.Topics)
return toRPCLogs(filter.Find(), false)
}
// UninstallFilter removes the filter with the given filter id.
func (s *PublicFilterAPI) UninstallFilter(filterId string) bool {
s.filterManager.Lock()
defer s.filterManager.Unlock()
s.filterMapMu.Lock()
id, ok := s.filterMapping[filterId]
if !ok {
s.filterMapMu.Unlock()
return false
}
delete(s.filterMapping, filterId)
s.filterMapMu.Unlock()
s.filterManager.Remove(id)
s.logMu.Lock()
if _, ok := s.logQueue[id]; ok {
delete(s.logQueue, id)
s.logMu.Unlock()
return true
}
s.logMu.Unlock()
s.blockMu.Lock()
if _, ok := s.blockQueue[id]; ok {
delete(s.blockQueue, id)
s.blockMu.Unlock()
return true
}
s.blockMu.Unlock()
s.transactionMu.Lock()
if _, ok := s.transactionQueue[id]; ok {
delete(s.transactionQueue, id)
s.transactionMu.Unlock()
return true
}
s.transactionMu.Unlock()
return false
}
// getFilterType is a helper utility that determine the type of filter for the given filter id.
func (s *PublicFilterAPI) getFilterType(id int) byte {
if _, ok := s.blockQueue[id]; ok {
return blockFilterTy
} else if _, ok := s.transactionQueue[id]; ok {
return transactionFilterTy
} else if _, ok := s.logQueue[id]; ok {
return logFilterTy
}
return unknownFilterTy
}
// blockFilterChanged returns a collection of block hashes for the block filter with the given id.
func (s *PublicFilterAPI) blockFilterChanged(id int) []common.Hash {
s.blockMu.Lock()
defer s.blockMu.Unlock()
if s.blockQueue[id] != nil {
return s.blockQueue[id].get()
}
return nil
}
// transactionFilterChanged returns a collection of transaction hashes for the pending
// transaction filter with the given id.
func (s *PublicFilterAPI) transactionFilterChanged(id int) []common.Hash {
s.blockMu.Lock()
defer s.blockMu.Unlock()
if s.transactionQueue[id] != nil {
return s.transactionQueue[id].get()
}
return nil
}
// logFilterChanged returns a collection of logs for the log filter with the given id.
func (s *PublicFilterAPI) logFilterChanged(id int) []vmlog {
s.logMu.Lock()
defer s.logMu.Unlock()
if s.logQueue[id] != nil {
return s.logQueue[id].get()
}
return nil
}
// GetFilterLogs returns the logs for the filter with the given id.
func (s *PublicFilterAPI) GetFilterLogs(filterId string) []vmlog {
s.filterMapMu.RLock()
id, ok := s.filterMapping[filterId]
s.filterMapMu.RUnlock()
if !ok {
return toRPCLogs(nil, false)
}
if filter := s.filterManager.Get(id); filter != nil {
return toRPCLogs(filter.Find(), false)
}
return toRPCLogs(nil, false)
}
// GetFilterChanges returns the logs for the filter with the given id since last time is was called.
// This can be used for polling.
func (s *PublicFilterAPI) GetFilterChanges(filterId string) interface{} {
s.filterMapMu.RLock()
id, ok := s.filterMapping[filterId]
s.filterMapMu.RUnlock()
if !ok { // filter not found
return []interface{}{}
}
switch s.getFilterType(id) {
case blockFilterTy:
return returnHashes(s.blockFilterChanged(id))
case transactionFilterTy:
return returnHashes(s.transactionFilterChanged(id))
case logFilterTy:
return s.logFilterChanged(id)
}
return []interface{}{}
}
type vmlog struct {
*vm.Log
Removed bool `json:"removed"`
}
type logQueue struct {
mu sync.Mutex
logs []vmlog
timeout time.Time
id int
}
func (l *logQueue) add(logs ...vmlog) {
l.mu.Lock()
defer l.mu.Unlock()
l.logs = append(l.logs, logs...)
}
func (l *logQueue) get() []vmlog {
l.mu.Lock()
defer l.mu.Unlock()
l.timeout = time.Now()
tmp := l.logs
l.logs = nil
return tmp
}
type hashQueue struct {
mu sync.Mutex
hashes []common.Hash
timeout time.Time
id int
}
func (l *hashQueue) add(hashes ...common.Hash) {
l.mu.Lock()
defer l.mu.Unlock()
l.hashes = append(l.hashes, hashes...)
}
func (l *hashQueue) get() []common.Hash {
l.mu.Lock()
defer l.mu.Unlock()
l.timeout = time.Now()
tmp := l.hashes
l.hashes = nil
return tmp
}
// newFilterId generates a new random filter identifier that can be exposed to the outer world. By publishing random
// identifiers it is not feasible for DApp's to guess filter id's for other DApp's and uninstall or poll for them
// causing the affected DApp to miss data.
func newFilterId() (string, error) {
var subid [16]byte
n, _ := rand.Read(subid[:])
if n != 16 {
return "", errors.New("Unable to generate filter id")
}
return "0x" + hex.EncodeToString(subid[:]), nil
}
// toRPCLogs is a helper that will convert a vm.Logs array to an structure which
// can hold additional information about the logs such as whether it was deleted.
// Additionally when nil is given it will by default instead create an empty slice
// instead. This is required by the RPC specification.
func toRPCLogs(logs vm.Logs, removed bool) []vmlog {
convertedLogs := make([]vmlog, len(logs))
for i, log := range logs {
convertedLogs[i] = vmlog{Log: log, Removed: removed}
}
return convertedLogs
}
// returnHashes is a helper that will return an empty hash array case the given hash array is nil, otherwise is will
// return the given hashes. The RPC interfaces defines that always an array is returned.
func returnHashes(hashes []common.Hash) []common.Hash {
if hashes == nil {
return []common.Hash{}
}
return hashes
}

27
eth/filters/api_test.go
View File

@ -14,7 +14,7 @@
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package filters_test
package filters
import (
"encoding/json"
@ -22,7 +22,6 @@ import (
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/eth/filters"
"github.com/ethereum/go-ethereum/rpc"
)
@ -39,14 +38,14 @@ func TestUnmarshalJSONNewFilterArgs(t *testing.T) {
)
// default values
var test0 filters.NewFilterArgs
var test0 FilterCriteria
if err := json.Unmarshal([]byte("{}"), &test0); err != nil {
t.Fatal(err)
}
if test0.FromBlock != rpc.LatestBlockNumber {
if test0.FromBlock.Int64() != rpc.LatestBlockNumber.Int64() {
t.Fatalf("expected %d, got %d", rpc.LatestBlockNumber, test0.FromBlock)
}
if test0.ToBlock != rpc.LatestBlockNumber {
if test0.ToBlock.Int64() != rpc.LatestBlockNumber.Int64() {
t.Fatalf("expected %d, got %d", rpc.LatestBlockNumber, test0.ToBlock)
}
if len(test0.Addresses) != 0 {
@ -57,20 +56,20 @@ func TestUnmarshalJSONNewFilterArgs(t *testing.T) {
}
// from, to block number
var test1 filters.NewFilterArgs
var test1 FilterCriteria
vector := fmt.Sprintf(`{"fromBlock":"0x%x","toBlock":"0x%x"}`, fromBlock, toBlock)
if err := json.Unmarshal([]byte(vector), &test1); err != nil {
t.Fatal(err)
}
if test1.FromBlock != fromBlock {
if test1.FromBlock.Int64() != fromBlock.Int64() {
t.Fatalf("expected FromBlock %d, got %d", fromBlock, test1.FromBlock)
}
if test1.ToBlock != toBlock {
if test1.ToBlock.Int64() != toBlock.Int64() {
t.Fatalf("expected ToBlock %d, got %d", toBlock, test1.ToBlock)
}
// single address
var test2 filters.NewFilterArgs
var test2 FilterCriteria
vector = fmt.Sprintf(`{"address": "%s"}`, address0.Hex())
if err := json.Unmarshal([]byte(vector), &test2); err != nil {
t.Fatal(err)
@ -83,7 +82,7 @@ func TestUnmarshalJSONNewFilterArgs(t *testing.T) {
}
// multiple address
var test3 filters.NewFilterArgs
var test3 FilterCriteria
vector = fmt.Sprintf(`{"address": ["%s", "%s"]}`, address0.Hex(), address1.Hex())
if err := json.Unmarshal([]byte(vector), &test3); err != nil {
t.Fatal(err)
@ -99,7 +98,7 @@ func TestUnmarshalJSONNewFilterArgs(t *testing.T) {
}
// single topic
var test4 filters.NewFilterArgs
var test4 FilterCriteria
vector = fmt.Sprintf(`{"topics": ["%s"]}`, topic0.Hex())
if err := json.Unmarshal([]byte(vector), &test4); err != nil {
t.Fatal(err)
@ -115,7 +114,7 @@ func TestUnmarshalJSONNewFilterArgs(t *testing.T) {
}
// test multiple "AND" topics
var test5 filters.NewFilterArgs
var test5 FilterCriteria
vector = fmt.Sprintf(`{"topics": ["%s", "%s"]}`, topic0.Hex(), topic1.Hex())
if err := json.Unmarshal([]byte(vector), &test5); err != nil {
t.Fatal(err)
@ -137,7 +136,7 @@ func TestUnmarshalJSONNewFilterArgs(t *testing.T) {
}
// test optional topic
var test6 filters.NewFilterArgs
var test6 FilterCriteria
vector = fmt.Sprintf(`{"topics": ["%s", null, "%s"]}`, topic0.Hex(), topic2.Hex())
if err := json.Unmarshal([]byte(vector), &test6); err != nil {
t.Fatal(err)
@ -165,7 +164,7 @@ func TestUnmarshalJSONNewFilterArgs(t *testing.T) {
}
// test OR topics
var test7 filters.NewFilterArgs
var test7 FilterCriteria
vector = fmt.Sprintf(`{"topics": [["%s", "%s"], null, ["%s", null]]}`, topic0.Hex(), topic1.Hex(), topic2.Hex())
if err := json.Unmarshal([]byte(vector), &test7); err != nil {
t.Fatal(err)

120
eth/filters/filter.go
View File

@ -23,15 +23,10 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/ethdb"
)
type AccountChange struct {
Address, StateAddress []byte
}
// Filtering interface
// Filter can be used to retrieve and filter logs
type Filter struct {
created time.Time
@ -39,70 +34,72 @@ type Filter struct {
begin, end int64
addresses []common.Address
topics [][]common.Hash
BlockCallback func(*types.Block, vm.Logs)
TransactionCallback func(*types.Transaction)
LogCallback func(*vm.Log, bool)
}
// Create a new filter which uses a bloom filter on blocks to figure out whether a particular block
// is interesting or not.
// New creates a new filter which uses a bloom filter on blocks to figure out whether
// a particular block is interesting or not.
func New(db ethdb.Database) *Filter {
return &Filter{db: db}
}
// Set the earliest and latest block for filtering.
// SetBeginBlock sets the earliest block for filtering.
// -1 = latest block (i.e., the current block)
// hash = particular hash from-to
func (self *Filter) SetBeginBlock(begin int64) {
self.begin = begin
func (f *Filter) SetBeginBlock(begin int64) {
f.begin = begin
}
func (self *Filter) SetEndBlock(end int64) {
self.end = end
// SetEndBlock sets the latest block for filtering.
func (f *Filter) SetEndBlock(end int64) {
f.end = end
}
func (self *Filter) SetAddresses(addr []common.Address) {
self.addresses = addr
// SetAddresses matches only logs that are generated from addresses that are included
// in the given addresses.
func (f *Filter) SetAddresses(addr []common.Address) {
f.addresses = addr
}
func (self *Filter) SetTopics(topics [][]common.Hash) {
self.topics = topics
// SetTopics matches only logs that have topics matching the given topics.
func (f *Filter) SetTopics(topics [][]common.Hash) {
f.topics = topics
}
// Run filters logs with the current parameters set
func (self *Filter) Find() vm.Logs {
latestHash := core.GetHeadBlockHash(self.db)
latestBlock := core.GetBlock(self.db, latestHash, core.GetBlockNumber(self.db, latestHash))
func (f *Filter) Find() []Log {
latestHash := core.GetHeadBlockHash(f.db)
latestBlock := core.GetBlock(f.db, latestHash, core.GetBlockNumber(f.db, latestHash))
if latestBlock == nil {
return vm.Logs{}
return []Log{}
}
var beginBlockNo uint64 = uint64(self.begin)
if self.begin == -1 {
var beginBlockNo uint64 = uint64(f.begin)
if f.begin == -1 {
beginBlockNo = latestBlock.NumberU64()
}
var endBlockNo uint64 = uint64(self.end)
if self.end == -1 {
endBlockNo := uint64(f.end)
if f.end == -1 {
endBlockNo = latestBlock.NumberU64()
}
// if no addresses are present we can't make use of fast search which
// uses the mipmap bloom filters to check for fast inclusion and uses
// higher range probability in order to ensure at least a false positive
if len(self.addresses) == 0 {
return self.getLogs(beginBlockNo, endBlockNo)
if len(f.addresses) == 0 {
return f.getLogs(beginBlockNo, endBlockNo)
}
return self.mipFind(beginBlockNo, endBlockNo, 0)
return f.mipFind(beginBlockNo, endBlockNo, 0)
}
func (self *Filter) mipFind(start, end uint64, depth int) (logs vm.Logs) {
func (f *Filter) mipFind(start, end uint64, depth int) (logs []Log) {
level := core.MIPMapLevels[depth]
// normalise numerator so we can work in level specific batches and
// work with the proper range checks
for num := start / level * level; num <= end; num += level {
// find addresses in bloom filters
bloom := core.GetMipmapBloom(self.db, num, level)
for _, addr := range self.addresses {
bloom := core.GetMipmapBloom(f.db, num, level)
for _, addr := range f.addresses {
if bloom.TestBytes(addr[:]) {
// range check normalised values and make sure that
// we're resolving the correct range instead of the
@ -110,9 +107,9 @@ func (self *Filter) mipFind(start, end uint64, depth int) (logs vm.Logs) {
start := uint64(math.Max(float64(num), float64(start)))
end := uint64(math.Min(float64(num+level-1), float64(end)))
if depth+1 == len(core.MIPMapLevels) {
logs = append(logs, self.getLogs(start, end)...)
logs = append(logs, f.getLogs(start, end)...)
} else {
logs = append(logs, self.mipFind(start, end, depth+1)...)
logs = append(logs, f.mipFind(start, end, depth+1)...)
}
// break so we don't check the same range for each
// possible address. Checks on multiple addresses
@ -125,12 +122,15 @@ func (self *Filter) mipFind(start, end uint64, depth int) (logs vm.Logs) {
return logs
}
func (self *Filter) getLogs(start, end uint64) (logs vm.Logs) {
for i := start; i <= end; i++ {
func (f *Filter) getLogs(start, end uint64) (logs []Log) {
var block *types.Block
hash := core.GetCanonicalHash(self.db, i)
for i := start; i <= end; i++ {
hash := core.GetCanonicalHash(f.db, i)
if hash != (common.Hash{}) {
block = core.GetBlock(self.db, hash, i)
block = core.GetBlock(f.db, hash, i)
} else { // block not found
return logs
}
if block == nil { // block not found/written
return logs
@ -138,16 +138,20 @@ func (self *Filter) getLogs(start, end uint64) (logs vm.Logs) {
// Use bloom filtering to see if this block is interesting given the
// current parameters
if self.bloomFilter(block) {
if f.bloomFilter(block) {
// Get the logs of the block
var (
receipts = core.GetBlockReceipts(self.db, block.Hash(), i)
unfiltered vm.Logs
receipts = core.GetBlockReceipts(f.db, block.Hash(), i)
unfiltered []Log
)
for _, receipt := range receipts {
unfiltered = append(unfiltered, receipt.Logs...)
rl := make([]Log, len(receipt.Logs))
for i, l := range receipt.Logs {
rl[i] = Log{l, false}
}
logs = append(logs, self.FilterLogs(unfiltered)...)
unfiltered = append(unfiltered, rl...)
}
logs = append(logs, filterLogs(unfiltered, f.addresses, f.topics)...)
}
}
@ -164,26 +168,25 @@ func includes(addresses []common.Address, a common.Address) bool {
return false
}
func (self *Filter) FilterLogs(logs vm.Logs) vm.Logs {
var ret vm.Logs
func filterLogs(logs []Log, addresses []common.Address, topics [][]common.Hash) []Log {
var ret []Log
// Filter the logs for interesting stuff
Logs:
for _, log := range logs {
if len(self.addresses) > 0 && !includes(self.addresses, log.Address) {
if len(addresses) > 0 && !includes(addresses, log.Address) {
continue
}
logTopics := make([]common.Hash, len(self.topics))
logTopics := make([]common.Hash, len(topics))
copy(logTopics, log.Topics)
// If the to filtered topics is greater than the amount of topics in
// logs, skip.
if len(self.topics) > len(log.Topics) {
// If the to filtered topics is greater than the amount of topics in logs, skip.
if len(topics) > len(log.Topics) {
continue Logs
}
for i, topics := range self.topics {
for i, topics := range topics {
var match bool
for _, topic := range topics {
// common.Hash{} is a match all (wildcard)
@ -196,7 +199,6 @@ Logs:
if !match {
continue Logs
}
}
ret = append(ret, log)
@ -205,10 +207,10 @@ Logs:
return ret
}
func (self *Filter) bloomFilter(block *types.Block) bool {
if len(self.addresses) > 0 {
func (f *Filter) bloomFilter(block *types.Block) bool {
if len(f.addresses) > 0 {
var included bool
for _, addr := range self.addresses {
for _, addr := range f.addresses {
if types.BloomLookup(block.Bloom(), addr) {
included = true
break
@ -220,7 +222,7 @@ func (self *Filter) bloomFilter(block *types.Block) bool {
}
}
for _, sub := range self.topics {
for _, sub := range f.topics {
var included bool
for _, topic := range sub {
if (topic == common.Hash{}) || types.BloomLookup(block.Bloom(), topic) {

380
eth/filters/filter_system.go
View File

@ -14,179 +14,305 @@
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// package filters implements an ethereum filtering system for block,
// Package filters implements an ethereum filtering system for block,
// transactions and log events.
package filters
import (
"encoding/json"
"errors"
"fmt"
"sync"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/rpc"
)
// FilterType determines the type of filter and is used to put the filter in to
// Type determines the kind of filter and is used to put the filter in to
// the correct bucket when added.
type FilterType byte
type Type byte
const (
ChainFilter FilterType = iota // new block events filter
PendingTxFilter // pending transaction filter
LogFilter // new or removed log filter
PendingLogFilter // pending log filter
// UnknownSubscription indicates an unkown subscription type
UnknownSubscription Type = iota
// LogsSubscription queries for new or removed (chain reorg) logs
LogsSubscription
// PendingLogsSubscription queries for logs for the pending block
PendingLogsSubscription
// PendingTransactionsSubscription queries tx hashes for pending
// transactions entering the pending state
PendingTransactionsSubscription
// BlocksSubscription queries hashes for blocks that are imported
BlocksSubscription
)
// FilterSystem manages filters that filter specific events such as
// block, transaction and log events. The Filtering system can be used to listen
// for specific LOG events fired by the EVM (Ethereum Virtual Machine).
type FilterSystem struct {
filterMu sync.RWMutex
filterId int
var (
ErrInvalidSubscriptionID = errors.New("invalid id")
)
chainFilters map[int]*Filter
pendingTxFilters map[int]*Filter
logFilters map[int]*Filter
pendingLogFilters map[int]*Filter
// Log is a helper that can hold additional information about vm.Log
// necessary for the RPC interface.
type Log struct {
*vm.Log
Removed bool `json:"removed"`
}
// generic is an ugly hack for Get
generic map[int]*Filter
func (l *Log) MarshalJSON() ([]byte, error) {
fields := map[string]interface{}{
"address": l.Address,
"data": fmt.Sprintf("0x%x", l.Data),
"blockNumber": fmt.Sprintf("%#x", l.BlockNumber),
"logIndex": fmt.Sprintf("%#x", l.Index),
"blockHash": l.BlockHash,
"transactionHash": l.TxHash,
"transactionIndex": fmt.Sprintf("%#x", l.TxIndex),
"topics": l.Topics,
"removed": l.Removed,
}
return json.Marshal(fields)
}
type subscription struct {
id rpc.ID
typ Type
created time.Time
logsCrit FilterCriteria
logs chan []Log
hashes chan common.Hash
headers chan *types.Header
installed chan struct{} // closed when the filter is installed
err chan error // closed when the filter is uninstalled
}
// EventSystem creates subscriptions, processes events and broadcasts them to the
// subscription which match the subscription criteria.
type EventSystem struct {
mux *event.TypeMux
sub event.Subscription
install chan *subscription // install filter for event notification
uninstall chan *subscription // remove filter for event notification
}
// NewFilterSystem returns a newly allocated filter manager
func NewFilterSystem(mux *event.TypeMux) *FilterSystem {
fs := &FilterSystem{
chainFilters: make(map[int]*Filter),
pendingTxFilters: make(map[int]*Filter),
logFilters: make(map[int]*Filter),
pendingLogFilters: make(map[int]*Filter),
generic: make(map[int]*Filter),
// NewEventSystem creates a new manager that listens for event on the given mux,
// parses and filters them. It uses the all map to retrieve filter changes. The
// work loop holds its own index that is used to forward events to filters.
//
// The returned manager has a loop that needs to be stopped with the Stop function
// or by stopping the given mux.
func NewEventSystem(mux *event.TypeMux) *EventSystem {
m := &EventSystem{
mux: mux,
install: make(chan *subscription),
uninstall: make(chan *subscription),
}
fs.sub = mux.Subscribe(
core.PendingLogsEvent{},
core.RemovedLogsEvent{},
core.ChainEvent{},
core.TxPreEvent{},
vm.Logs(nil),
)
go fs.filterLoop()
return fs
go m.eventLoop()
return m
}
// Stop quits the filter loop required for polling events
func (fs *FilterSystem) Stop() {
fs.sub.Unsubscribe()
// Subscription is created when the client registers itself for a particular event.
type Subscription struct {
ID rpc.ID
f *subscription
es *EventSystem
unsubOnce sync.Once
}
// Acquire filter system maps lock, required to force lock acquisition
// sequence with filterMu acquired first to avoid deadlocks by callbacks
func (fs *FilterSystem) Lock() {
fs.filterMu.Lock()
// Err returns a channel that is closed when unsubscribed.
func (sub *Subscription) Err() <-chan error {
return sub.f.err
}
// Release filter system maps lock
func (fs *FilterSystem) Unlock() {
fs.filterMu.Unlock()
}
// Add adds a filter to the filter manager
// Expects filterMu to be locked.
func (fs *FilterSystem) Add(filter *Filter, filterType FilterType) (int, error) {
id := fs.filterId
filter.created = time.Now()
switch filterType {
case ChainFilter:
fs.chainFilters[id] = filter
case PendingTxFilter:
fs.pendingTxFilters[id] = filter
case LogFilter:
fs.logFilters[id] = filter
case PendingLogFilter:
fs.pendingLogFilters[id] = filter
default:
return 0, fmt.Errorf("unknown filter type %v", filterType)
}
fs.generic[id] = filter
fs.filterId++
return id, nil
}
// Remove removes a filter by filter id
// Expects filterMu to be locked.
func (fs *FilterSystem) Remove(id int) {
delete(fs.chainFilters, id)
delete(fs.pendingTxFilters, id)
delete(fs.logFilters, id)
delete(fs.pendingLogFilters, id)
delete(fs.generic, id)
}
func (fs *FilterSystem) Get(id int) *Filter {
fs.filterMu.RLock()
defer fs.filterMu.RUnlock()
return fs.generic[id]
}
// filterLoop waits for specific events from ethereum and fires their handlers
// when the filter matches the requirements.
func (fs *FilterSystem) filterLoop() {
for event := range fs.sub.Chan() {
switch ev := event.Data.(type) {
case core.ChainEvent:
fs.filterMu.RLock()
for _, filter := range fs.chainFilters {
if filter.BlockCallback != nil && !filter.created.After(event.Time) {
filter.BlockCallback(ev.Block, ev.Logs)
// Unsubscribe uninstalls the subscription from the event broadcast loop.
func (sub *Subscription) Unsubscribe() {
sub.unsubOnce.Do(func() {
uninstallLoop:
for {
// write uninstall request and consume logs/hashes. This prevents
// the eventLoop broadcast method to deadlock when writing to the
// filter event channel while the subscription loop is waiting for
// this method to return (and thus not reading these events).
select {
case sub.es.uninstall <- sub.f:
break uninstallLoop
case <-sub.f.logs:
case <-sub.f.hashes:
case <-sub.f.headers:
}
}
fs.filterMu.RUnlock()
case core.TxPreEvent:
fs.filterMu.RLock()
for _, filter := range fs.pendingTxFilters {
if filter.TransactionCallback != nil && !filter.created.After(event.Time) {
filter.TransactionCallback(ev.Tx)
}
}
fs.filterMu.RUnlock()
// wait for filter to be uninstalled in work loop before returning
// this ensures that the manager won't use the event channel which
// will probably be closed by the client asap after this method returns.
<-sub.Err()
})
}
// subscribe installs the subscription in the event broadcast loop.
func (es *EventSystem) subscribe(sub *subscription) *Subscription {
es.install <- sub
<-sub.installed
return &Subscription{ID: sub.id, f: sub, es: es}
}
// SubscribeLogs creates a subscription that will write all logs matching the
// given criteria to the given logs channel.
func (es *EventSystem) SubscribeLogs(crit FilterCriteria, logs chan []Log) *Subscription {
sub := &subscription{
id: rpc.NewID(),
typ: LogsSubscription,
logsCrit: crit,
created: time.Now(),
logs: logs,
hashes: make(chan common.Hash),
headers: make(chan *types.Header),
installed: make(chan struct{}),
err: make(chan error),
}
return es.subscribe(sub)
}
// SubscribePendingLogs creates a subscription that will write pending logs matching the
// given criteria to the given channel.
func (es *EventSystem) SubscribePendingLogs(crit FilterCriteria, logs chan []Log) *Subscription {
sub := &subscription{
id: rpc.NewID(),
typ: PendingLogsSubscription,
logsCrit: crit,
created: time.Now(),
logs: logs,
hashes: make(chan common.Hash),
headers: make(chan *types.Header),
installed: make(chan struct{}),
err: make(chan error),
}
return es.subscribe(sub)
}
// SubscribePendingTxEvents creates a sbuscription that writes transaction hashes for
// transactions that enter the transaction pool.
func (es *EventSystem) SubscribePendingTxEvents(hashes chan common.Hash) *Subscription {
sub := &subscription{
id: rpc.NewID(),
typ: PendingTransactionsSubscription,
created: time.Now(),
logs: make(chan []Log),
hashes: hashes,
headers: make(chan *types.Header),
installed: make(chan struct{}),
err: make(chan error),
}
return es.subscribe(sub)
}
// SubscribeNewHeads creates a subscription that writes the header of a block that is
// imported in the chain.
func (es *EventSystem) SubscribeNewHeads(headers chan *types.Header) *Subscription {
sub := &subscription{
id: rpc.NewID(),
typ: BlocksSubscription,
created: time.Now(),
logs: make(chan []Log),
hashes: make(chan common.Hash),
headers: headers,
installed: make(chan struct{}),
err: make(chan error),
}
return es.subscribe(sub)
}
type filterIndex map[Type]map[rpc.ID]*subscription
// broadcast event to filters that match criteria.
func broadcast(filters filterIndex, ev *event.Event) {
if ev == nil {
return
}
switch e := ev.Data.(type) {
case vm.Logs:
fs.filterMu.RLock()
for _, filter := range fs.logFilters {
if filter.LogCallback != nil && !filter.created.After(event.Time) {
for _, log := range filter.FilterLogs(ev) {
filter.LogCallback(log, false)
if len(e) > 0 {
for _, f := range filters[LogsSubscription] {
if ev.Time.After(f.created) {
if matchedLogs := filterLogs(convertLogs(e, false), f.logsCrit.Addresses, f.logsCrit.Topics); len(matchedLogs) > 0 {
f.logs <- matchedLogs
}
}
}
}
fs.filterMu.RUnlock()
case core.RemovedLogsEvent:
fs.filterMu.RLock()
for _, filter := range fs.logFilters {
if filter.LogCallback != nil && !filter.created.After(event.Time) {
for _, removedLog := range filter.FilterLogs(ev.Logs) {
filter.LogCallback(removedLog, true)
for _, f := range filters[LogsSubscription] {
if ev.Time.After(f.created) {
if matchedLogs := filterLogs(convertLogs(e.Logs, true), f.logsCrit.Addresses, f.logsCrit.Topics); len(matchedLogs) > 0 {
f.logs <- matchedLogs
}
}
}
fs.filterMu.RUnlock()
case core.PendingLogsEvent:
fs.filterMu.RLock()
for _, filter := range fs.pendingLogFilters {
if filter.LogCallback != nil && !filter.created.After(event.Time) {
for _, pendingLog := range ev.Logs {
filter.LogCallback(pendingLog, false)
for _, f := range filters[PendingLogsSubscription] {
if ev.Time.After(f.created) {
if matchedLogs := filterLogs(convertLogs(e.Logs, false), f.logsCrit.Addresses, f.logsCrit.Topics); len(matchedLogs) > 0 {
f.logs <- matchedLogs
}
}
}
fs.filterMu.RUnlock()
case core.TxPreEvent:
for _, f := range filters[PendingTransactionsSubscription] {
if ev.Time.After(f.created) {
f.hashes <- e.Tx.Hash()
}
}
case core.ChainEvent:
for _, f := range filters[BlocksSubscription] {
if ev.Time.After(f.created) {
f.headers <- e.Block.Header()
}
}
}
}
// eventLoop (un)installs filters and processes mux events.
func (es *EventSystem) eventLoop() {
var (
index = make(filterIndex)
sub = es.mux.Subscribe(core.PendingLogsEvent{}, core.RemovedLogsEvent{}, vm.Logs{}, core.TxPreEvent{}, core.ChainEvent{})
)
for {
select {
case ev, active := <-sub.Chan():
if !active { // system stopped
return
}
broadcast(index, ev)
case f := <-es.install:
if _, found := index[f.typ]; !found {
index[f.typ] = make(map[rpc.ID]*subscription)
}
index[f.typ][f.id] = f
close(f.installed)
case f := <-es.uninstall:
delete(index[f.typ], f.id)
close(f.err)
}
}
}
// convertLogs is a helper utility that converts vm.Logs to []filter.Log.
func convertLogs(in vm.Logs, removed bool) []Log {
logs := make([]Log, len(in))
for i, l := range in {
logs[i] = Log{l, removed}
}
return logs
}

353
eth/filters/filter_system_test.go
View File

@ -17,101 +17,310 @@
package filters
import (
"math/big"
"reflect"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/rpc"
)
func TestCallbacks(t *testing.T) {
var (
mux = new(event.TypeMux)
db, _ = ethdb.NewMemDatabase()
api = NewPublicFilterAPI(db, mux)
)
// TestBlockSubscription tests if a block subscription returns block hashes for posted chain events.
// It creates multiple subscriptions:
// - one at the start and should receive all posted chain events and a second (blockHashes)
// - one that is created after a cutoff moment and uninstalled after a second cutoff moment (blockHashes[cutoff1:cutoff2])
// - one that is created after the second cutoff moment (blockHashes[cutoff2:])
func TestBlockSubscription(t *testing.T) {
t.Parallel()
var (
mux event.TypeMux
fs = NewFilterSystem(&mux)
blockDone = make(chan struct{})
txDone = make(chan struct{})
logDone = make(chan struct{})
removedLogDone = make(chan struct{})
pendingLogDone = make(chan struct{})
genesis = core.WriteGenesisBlockForTesting(db)
chain, _ = core.GenerateChain(nil, genesis, db, 10, func(i int, gen *core.BlockGen) {})
chainEvents = []core.ChainEvent{}
)
blockFilter := &Filter{
BlockCallback: func(*types.Block, vm.Logs) {
close(blockDone)
},
}
txFilter := &Filter{
TransactionCallback: func(*types.Transaction) {
close(txDone)
},
}
logFilter := &Filter{
LogCallback: func(l *vm.Log, oob bool) {
if !oob {
close(logDone)
}
},
}
removedLogFilter := &Filter{
LogCallback: func(l *vm.Log, oob bool) {
if oob {
close(removedLogDone)
}
},
}
pendingLogFilter := &Filter{
LogCallback: func(*vm.Log, bool) {
close(pendingLogDone)
},
for _, blk := range chain {
chainEvents = append(chainEvents, core.ChainEvent{Hash: blk.Hash(), Block: blk})
}
fs.Add(blockFilter, ChainFilter)
fs.Add(txFilter, PendingTxFilter)
fs.Add(logFilter, LogFilter)
fs.Add(removedLogFilter, LogFilter)
fs.Add(pendingLogFilter, PendingLogFilter)
chan0 := make(chan *types.Header)
sub0 := api.events.SubscribeNewHeads(chan0)
chan1 := make(chan *types.Header)
sub1 := api.events.SubscribeNewHeads(chan1)
mux.Post(core.ChainEvent{})
mux.Post(core.TxPreEvent{})
mux.Post(vm.Logs{&vm.Log{}})
mux.Post(core.RemovedLogsEvent{Logs: vm.Logs{&vm.Log{}}})
mux.Post(core.PendingLogsEvent{Logs: vm.Logs{&vm.Log{}}})
const dura = 5 * time.Second
failTimer := time.NewTimer(dura)
go func() { // simulate client
i1, i2 := 0, 0
for i1 != len(chainEvents) || i2 != len(chainEvents) {
select {
case <-blockDone:
case <-failTimer.C:
t.Error("block filter failed to trigger (timeout)")
case header := <-chan0:
if chainEvents[i1].Hash != header.Hash() {
t.Errorf("sub0 received invalid hash on index %d, want %x, got %x", i1, chainEvents[i1].Hash, header.Hash())
}
i1++
case header := <-chan1:
if chainEvents[i2].Hash != header.Hash() {
t.Errorf("sub1 received invalid hash on index %d, want %x, got %x", i2, chainEvents[i2].Hash, header.Hash())
}
i2++
}
}
failTimer.Reset(dura)
select {
case <-txDone:
case <-failTimer.C:
t.Error("transaction filter failed to trigger (timeout)")
sub0.Unsubscribe()
sub1.Unsubscribe()
}()
time.Sleep(1 * time.Second)
for _, e := range chainEvents {
mux.Post(e)
}
failTimer.Reset(dura)
select {
case <-logDone:
case <-failTimer.C:
t.Error("log filter failed to trigger (timeout)")
<-sub0.Err()
<-sub1.Err()
}
// TestPendingTxFilter tests whether pending tx filters retrieve all pending transactions that are posted to the event mux.
func TestPendingTxFilter(t *testing.T) {
t.Parallel()
var (
transactions = []*types.Transaction{
types.NewTransaction(0, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), new(big.Int), new(big.Int), nil),
types.NewTransaction(1, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), new(big.Int), new(big.Int), nil),
types.NewTransaction(2, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), new(big.Int), new(big.Int), nil),
types.NewTransaction(3, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), new(big.Int), new(big.Int), nil),
types.NewTransaction(4, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), new(big.Int), new(big.Int), nil),
}
failTimer.Reset(dura)
select {
case <-removedLogDone:
case <-failTimer.C:
t.Error("removed log filter failed to trigger (timeout)")
hashes []common.Hash
)
fid0 := api.NewPendingTransactionFilter()
time.Sleep(1 * time.Second)
for _, tx := range transactions {
ev := core.TxPreEvent{Tx: tx}
mux.Post(ev)
}
failTimer.Reset(dura)
select {
case <-pendingLogDone:
case <-failTimer.C:
t.Error("pending log filter failed to trigger (timeout)")
for {
h := api.GetFilterChanges(fid0).([]common.Hash)
hashes = append(hashes, h...)
if len(hashes) >= len(transactions) {
break
}
time.Sleep(100 * time.Millisecond)
}
for i := range hashes {
if hashes[i] != transactions[i].Hash() {
t.Errorf("hashes[%d] invalid, want %x, got %x", i, transactions[i].Hash(), hashes[i])
}
}
}
// TestLogFilter tests whether log filters match the correct logs that are posted to the event mux.
func TestLogFilter(t *testing.T) {
t.Parallel()
var (
firstAddr = common.HexToAddress("0x1111111111111111111111111111111111111111")
secondAddr = common.HexToAddress("0x2222222222222222222222222222222222222222")
thirdAddress = common.HexToAddress("0x3333333333333333333333333333333333333333")
notUsedAddress = common.HexToAddress("0x9999999999999999999999999999999999999999")
firstTopic = common.HexToHash("0x1111111111111111111111111111111111111111111111111111111111111111")
secondTopic = common.HexToHash("0x2222222222222222222222222222222222222222222222222222222222222222")
notUsedTopic = common.HexToHash("0x9999999999999999999999999999999999999999999999999999999999999999")
allLogs = vm.Logs{
// Note, these are used for comparison of the test cases.
vm.NewLog(firstAddr, []common.Hash{}, []byte(""), 0),
vm.NewLog(firstAddr, []common.Hash{firstTopic}, []byte(""), 1),
vm.NewLog(secondAddr, []common.Hash{firstTopic}, []byte(""), 1),
vm.NewLog(thirdAddress, []common.Hash{secondTopic}, []byte(""), 2),
vm.NewLog(thirdAddress, []common.Hash{secondTopic}, []byte(""), 3),
}
testCases = []struct {
crit FilterCriteria
expected vm.Logs
id rpc.ID
}{
// match all
{FilterCriteria{}, allLogs, ""},
// match none due to no matching addresses
{FilterCriteria{Addresses: []common.Address{common.Address{}, notUsedAddress}, Topics: [][]common.Hash{allLogs[0].Topics}}, vm.Logs{}, ""},
// match logs based on addresses, ignore topics
{FilterCriteria{Addresses: []common.Address{firstAddr}}, allLogs[:2], ""},
// match none due to no matching topics (match with address)
{FilterCriteria{Addresses: []common.Address{secondAddr}, Topics: [][]common.Hash{[]common.Hash{notUsedTopic}}}, vm.Logs{}, ""},
// match logs based on addresses and topics
{FilterCriteria{Addresses: []common.Address{thirdAddress}, Topics: [][]common.Hash{[]common.Hash{firstTopic, secondTopic}}}, allLogs[3:5], ""},
// match logs based on multiple addresses and "or" topics
{FilterCriteria{Addresses: []common.Address{secondAddr, thirdAddress}, Topics: [][]common.Hash{[]common.Hash{firstTopic, secondTopic}}}, allLogs[2:5], ""},
// block numbers are ignored for filters created with New***Filter, these return all logs that match the given criterias when the state changes
{FilterCriteria{Addresses: []common.Address{firstAddr}, FromBlock: big.NewInt(1), ToBlock: big.NewInt(2)}, allLogs[:2], ""},
}
err error
)
// create all filters
for i := range testCases {
testCases[i].id = api.NewFilter(testCases[i].crit)
}
// raise events
time.Sleep(1 * time.Second)
if err = mux.Post(allLogs); err != nil {
t.Fatal(err)
}
for i, tt := range testCases {
var fetched []Log
for { // fetch all expected logs
fetched = append(fetched, api.GetFilterChanges(tt.id).([]Log)...)
if len(fetched) >= len(tt.expected) {
break
}
time.Sleep(100 * time.Millisecond)
}
if len(fetched) != len(tt.expected) {
t.Errorf("invalid number of logs for case %d, want %d log(s), got %d", i, len(tt.expected), len(fetched))
return
}
for l := range fetched {
if fetched[l].Removed {
t.Errorf("expected log not to be removed for log %d in case %d", l, i)
}
if !reflect.DeepEqual(fetched[l].Log, tt.expected[l]) {
t.Errorf("invalid log on index %d for case %d", l, i)
}
}
}
}
// TestPendingLogsSubscription tests if a subscription receives the correct pending logs that are posted to the event mux.
func TestPendingLogsSubscription(t *testing.T) {
t.Parallel()
var (
firstAddr = common.HexToAddress("0x1111111111111111111111111111111111111111")
secondAddr = common.HexToAddress("0x2222222222222222222222222222222222222222")
thirdAddress = common.HexToAddress("0x3333333333333333333333333333333333333333")
notUsedAddress = common.HexToAddress("0x9999999999999999999999999999999999999999")
firstTopic = common.HexToHash("0x1111111111111111111111111111111111111111111111111111111111111111")
secondTopic = common.HexToHash("0x2222222222222222222222222222222222222222222222222222222222222222")
thirdTopic = common.HexToHash("0x3333333333333333333333333333333333333333333333333333333333333333")
forthTopic = common.HexToHash("0x4444444444444444444444444444444444444444444444444444444444444444")
notUsedTopic = common.HexToHash("0x9999999999999999999999999999999999999999999999999999999999999999")
allLogs = []core.PendingLogsEvent{
core.PendingLogsEvent{Logs: vm.Logs{vm.NewLog(firstAddr, []common.Hash{}, []byte(""), 0)}},
core.PendingLogsEvent{Logs: vm.Logs{vm.NewLog(firstAddr, []common.Hash{firstTopic}, []byte(""), 1)}},
core.PendingLogsEvent{Logs: vm.Logs{vm.NewLog(secondAddr, []common.Hash{firstTopic}, []byte(""), 2)}},
core.PendingLogsEvent{Logs: vm.Logs{vm.NewLog(thirdAddress, []common.Hash{secondTopic}, []byte(""), 3)}},
core.PendingLogsEvent{Logs: vm.Logs{vm.NewLog(thirdAddress, []common.Hash{secondTopic}, []byte(""), 4)}},
core.PendingLogsEvent{Logs: vm.Logs{
vm.NewLog(thirdAddress, []common.Hash{firstTopic}, []byte(""), 5),
vm.NewLog(thirdAddress, []common.Hash{thirdTopic}, []byte(""), 5),
vm.NewLog(thirdAddress, []common.Hash{forthTopic}, []byte(""), 5),
vm.NewLog(firstAddr, []common.Hash{firstTopic}, []byte(""), 5),
}},
}
convertLogs = func(pl []core.PendingLogsEvent) vm.Logs {
var logs vm.Logs
for _, l := range pl {
logs = append(logs, l.Logs...)
}
return logs
}
testCases = []struct {
crit FilterCriteria
expected vm.Logs
c chan []Log
sub *Subscription
}{
// match all
{FilterCriteria{}, convertLogs(allLogs), nil, nil},
// match none due to no matching addresses
{FilterCriteria{Addresses: []common.Address{common.Address{}, notUsedAddress}, Topics: [][]common.Hash{[]common.Hash{}}}, vm.Logs{}, nil, nil},
// match logs based on addresses, ignore topics
{FilterCriteria{Addresses: []common.Address{firstAddr}}, append(convertLogs(allLogs[:2]), allLogs[5].Logs[3]), nil, nil},
// match none due to no matching topics (match with address)
{FilterCriteria{Addresses: []common.Address{secondAddr}, Topics: [][]common.Hash{[]common.Hash{notUsedTopic}}}, vm.Logs{}, nil, nil},
// match logs based on addresses and topics
{FilterCriteria{Addresses: []common.Address{thirdAddress}, Topics: [][]common.Hash{[]common.Hash{firstTopic, secondTopic}}}, append(convertLogs(allLogs[3:5]), allLogs[5].Logs[0]), nil, nil},
// match logs based on multiple addresses and "or" topics
{FilterCriteria{Addresses: []common.Address{secondAddr, thirdAddress}, Topics: [][]common.Hash{[]common.Hash{firstTopic, secondTopic}}}, append(convertLogs(allLogs[2:5]), allLogs[5].Logs[0]), nil, nil},
// block numbers are ignored for filters created with New***Filter, these return all logs that match the given criterias when the state changes
{FilterCriteria{Addresses: []common.Address{firstAddr}, FromBlock: big.NewInt(2), ToBlock: big.NewInt(3)}, append(convertLogs(allLogs[:2]), allLogs[5].Logs[3]), nil, nil},
// multiple pending logs, should match only 2 topics from the logs in block 5
{FilterCriteria{Addresses: []common.Address{thirdAddress}, Topics: [][]common.Hash{[]common.Hash{firstTopic, forthTopic}}}, vm.Logs{allLogs[5].Logs[0], allLogs[5].Logs[2]}, nil, nil},
}
)
// create all subscriptions, this ensures all subscriptions are created before the events are posted.
// on slow machines this could otherwise lead to missing events when the subscription is created after
// (some) events are posted.
for i := range testCases {
testCases[i].c = make(chan []Log)
testCases[i].sub = api.events.SubscribePendingLogs(testCases[i].crit, testCases[i].c)
}
for n, test := range testCases {
i := n
tt := test
go func() {
var fetched []Log
fetchLoop:
for {
logs := <-tt.c
fetched = append(fetched, logs...)
if len(fetched) >= len(tt.expected) {
break fetchLoop
}
}
if len(fetched) != len(tt.expected) {
t.Fatalf("invalid number of logs for case %d, want %d log(s), got %d", i, len(tt.expected), len(fetched))
}
for l := range fetched {
if fetched[l].Removed {
t.Errorf("expected log not to be removed for log %d in case %d", l, i)
}
if !reflect.DeepEqual(fetched[l].Log, tt.expected[l]) {
t.Errorf("invalid log on index %d for case %d", l, i)
}
}
}()
}
// raise events
time.Sleep(1 * time.Second)
for _, l := range allLogs {
if err := mux.Post(l); err != nil {
t.Fatal(err)
}
}
}

122
internal/ethapi/api.go
View File

@ -24,7 +24,6 @@ import (
"fmt"
"math/big"
"strings"
"sync"
"time"
"github.com/ethereum/ethash"
@ -346,36 +345,11 @@ func (s *PrivateAccountAPI) SignAndSendTransaction(ctx context.Context, args Sen
// It offers only methods that operate on public data that is freely available to anyone.
type PublicBlockChainAPI struct {
b Backend
muNewBlockSubscriptions sync.Mutex // protects newBlocksSubscriptions
newBlockSubscriptions map[string]func(core.ChainEvent) error // callbacks for new block subscriptions
}
// NewPublicBlockChainAPI creates a new Etheruem blockchain API.
func NewPublicBlockChainAPI(b Backend) *PublicBlockChainAPI {
api := &PublicBlockChainAPI{
b: b,
newBlockSubscriptions: make(map[string]func(core.ChainEvent) error),
}
go api.subscriptionLoop()
return api
}
// subscriptionLoop reads events from the global event mux and creates notifications for the matched subscriptions.
func (s *PublicBlockChainAPI) subscriptionLoop() {
sub := s.b.EventMux().Subscribe(core.ChainEvent{})
for event := range sub.Chan() {
if chainEvent, ok := event.Data.(core.ChainEvent); ok {
s.muNewBlockSubscriptions.Lock()
for id, notifyOf := range s.newBlockSubscriptions {
if notifyOf(chainEvent) == rpc.ErrNotificationNotFound {
delete(s.newBlockSubscriptions, id)
}
}
s.muNewBlockSubscriptions.Unlock()
}
}
return &PublicBlockChainAPI{b}
}
// BlockNumber returns the block number of the chain head.
@ -470,45 +444,6 @@ func (s *PublicBlockChainAPI) GetUncleCountByBlockHash(ctx context.Context, bloc
return nil
}
// NewBlocksArgs allows the user to specify if the returned block should include transactions and in which format.
type NewBlocksArgs struct {
IncludeTransactions bool `json:"includeTransactions"`
TransactionDetails bool `json:"transactionDetails"`
}
// NewBlocks triggers a new block event each time a block is appended to the chain. It accepts an argument which allows
// the caller to specify whether the output should contain transactions and in what format.
func (s *PublicBlockChainAPI) NewBlocks(ctx context.Context, args NewBlocksArgs) (rpc.Subscription, error) {
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return nil, rpc.ErrNotificationsUnsupported
}
// create a subscription that will remove itself when unsubscribed/cancelled
subscription, err := notifier.NewSubscription(func(subId string) {
s.muNewBlockSubscriptions.Lock()
delete(s.newBlockSubscriptions, subId)
s.muNewBlockSubscriptions.Unlock()
})
if err != nil {
return nil, err
}
// add a callback that is called on chain events which will format the block and notify the client
s.muNewBlockSubscriptions.Lock()
s.newBlockSubscriptions[subscription.ID()] = func(e core.ChainEvent) error {
notification, err := s.rpcOutputBlock(e.Block, args.IncludeTransactions, args.TransactionDetails)
if err == nil {
return subscription.Notify(notification)
}
glog.V(logger.Warn).Info("unable to format block %v\n", err)
return nil
}
s.muNewBlockSubscriptions.Unlock()
return subscription, nil
}
// GetCode returns the code stored at the given address in the state for the given block number.
func (s *PublicBlockChainAPI) GetCode(ctx context.Context, address common.Address, blockNr rpc.BlockNumber) (string, error) {
state, _, err := s.b.StateAndHeaderByNumber(blockNr)
@ -868,39 +803,11 @@ func newRPCTransaction(b *types.Block, txHash common.Hash) (*RPCTransaction, err
// PublicTransactionPoolAPI exposes methods for the RPC interface
type PublicTransactionPoolAPI struct {
b Backend
muPendingTxSubs sync.Mutex
pendingTxSubs map[string]rpc.Subscription
}
// NewPublicTransactionPoolAPI creates a new RPC service with methods specific for the transaction pool.
func NewPublicTransactionPoolAPI(b Backend) *PublicTransactionPoolAPI {
api := &PublicTransactionPoolAPI{
b: b,
pendingTxSubs: make(map[string]rpc.Subscription),
}
go api.subscriptionLoop()
return api
}
// subscriptionLoop listens for events on the global event mux and creates notifications for subscriptions.
func (s *PublicTransactionPoolAPI) subscriptionLoop() {
sub := s.b.EventMux().Subscribe(core.TxPreEvent{})
for event := range sub.Chan() {
tx := event.Data.(core.TxPreEvent)
if from, err := tx.Tx.FromFrontier(); err == nil {
if s.b.AccountManager().HasAddress(from) {
s.muPendingTxSubs.Lock()
for id, sub := range s.pendingTxSubs {
if sub.Notify(tx.Tx.Hash()) == rpc.ErrNotificationNotFound {
delete(s.pendingTxSubs, id)
}
}
s.muPendingTxSubs.Unlock()
}
}
}
return &PublicTransactionPoolAPI{b}
}
func getTransaction(chainDb ethdb.Database, b Backend, txHash common.Hash) (*types.Transaction, bool, error) {
@ -1353,31 +1260,6 @@ func (s *PublicTransactionPoolAPI) PendingTransactions() []*RPCTransaction {
return transactions
}
// NewPendingTransactions creates a subscription that is triggered each time a transaction enters the transaction pool
// and is send from one of the transactions this nodes manages.
func (s *PublicTransactionPoolAPI) NewPendingTransactions(ctx context.Context) (rpc.Subscription, error) {
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return nil, rpc.ErrNotificationsUnsupported
}
subscription, err := notifier.NewSubscription(func(id string) {
s.muPendingTxSubs.Lock()
delete(s.pendingTxSubs, id)
s.muPendingTxSubs.Unlock()
})
if err != nil {
return nil, err
}
s.muPendingTxSubs.Lock()
s.pendingTxSubs[subscription.ID()] = subscription
s.muPendingTxSubs.Unlock()
return subscription, nil
}
// Resend accepts an existing transaction and a new gas price and limit. It will remove the given transaction from the
// pool and reinsert it with the new gas price and limit.
func (s *PublicTransactionPoolAPI) Resend(ctx context.Context, tx *Tx, gasPrice, gasLimit *rpc.HexNumber) (common.Hash, error) {

297
rpc/notification.go
View File

@ -1,297 +0,0 @@
// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package rpc
import (
"errors"
"sync"
"time"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"golang.org/x/net/context"
)
var (
// ErrNotificationsUnsupported is returned when the connection doesn't support notifications
ErrNotificationsUnsupported = errors.New("subscription notifications not supported by the current transport")
// ErrNotificationNotFound is returned when the notification for the given id is not found
ErrNotificationNotFound = errors.New("notification not found")
// errNotifierStopped is returned when the notifier is stopped (e.g. codec is closed)
errNotifierStopped = errors.New("unable to send notification")
// errNotificationQueueFull is returns when there are too many notifications in the queue
errNotificationQueueFull = errors.New("too many pending notifications")
)
// unsubSignal is a signal that the subscription is unsubscribed. It is used to flush buffered
// notifications that might be pending in the internal queue.
var unsubSignal = new(struct{})
// UnsubscribeCallback defines a callback that is called when a subcription ends.
// It receives the subscription id as argument.
type UnsubscribeCallback func(id string)
// notification is a helper object that holds event data for a subscription
type notification struct {
sub *bufferedSubscription // subscription id
data interface{} // event data
}
// A Notifier type describes the interface for objects that can send create subscriptions
type Notifier interface {
// Create a new subscription. The given callback is called when this subscription
// is cancelled (e.g. client send an unsubscribe, connection closed).
NewSubscription(UnsubscribeCallback) (Subscription, error)
// Cancel subscription
Unsubscribe(id string) error
}
type notifierKey struct{}
// NotifierFromContext returns the Notifier value stored in ctx, if any.
func NotifierFromContext(ctx context.Context) (Notifier, bool) {
n, ok := ctx.Value(notifierKey{}).(Notifier)
return n, ok
}
// Subscription defines the interface for objects that can notify subscribers
type Subscription interface {
// Inform client of an event
Notify(data interface{}) error
// Unique identifier
ID() string
// Cancel subscription
Cancel() error
}
// bufferedSubscription is a subscription that uses a bufferedNotifier to send
// notifications to subscribers.
type bufferedSubscription struct {
id string
unsubOnce sync.Once // call unsub method once
unsub UnsubscribeCallback // called on Unsubscribed
notifier *bufferedNotifier // forward notifications to
pending chan interface{} // closed when active
flushed chan interface{} // closed when all buffered notifications are send
lastNotification time.Time // last time a notification was send
}
// ID returns the subscription identifier that the client uses to refer to this instance.
func (s *bufferedSubscription) ID() string {
return s.id
}
// Cancel informs the notifier that this subscription is cancelled by the API
func (s *bufferedSubscription) Cancel() error {
return s.notifier.Unsubscribe(s.id)
}
// Notify the subscriber of a particular event.
func (s *bufferedSubscription) Notify(data interface{}) error {
return s.notifier.send(s.id, data)
}
// bufferedNotifier is a notifier that queues notifications in an internal queue and
// send them as fast as possible to the client from this queue. It will stop if the
// queue grows past a given size.
type bufferedNotifier struct {
codec ServerCodec // underlying connection
mu sync.Mutex // guard internal state
subscriptions map[string]*bufferedSubscription // keep track of subscriptions associated with codec
queueSize int // max number of items in queue
queue chan *notification // notification queue
stopped bool // indication if this notifier is ordered to stop
}
// newBufferedNotifier returns a notifier that queues notifications in an internal queue
// from which notifications are send as fast as possible to the client. If the queue size
// limit is reached (client is unable to keep up) it will stop and closes the codec.
func newBufferedNotifier(codec ServerCodec, size int) *bufferedNotifier {
notifier := &bufferedNotifier{
codec: codec,
subscriptions: make(map[string]*bufferedSubscription),
queue: make(chan *notification, size),
queueSize: size,
}
go notifier.run()
return notifier
}
// NewSubscription creates a new subscription that forwards events to this instance internal
// queue. The given callback is called when the subscription is unsubscribed/cancelled.
func (n *bufferedNotifier) NewSubscription(callback UnsubscribeCallback) (Subscription, error) {
id, err := newSubscriptionID()
if err != nil {
return nil, err
}
n.mu.Lock()
defer n.mu.Unlock()
if n.stopped {
return nil, errNotifierStopped
}
sub := &bufferedSubscription{
id: id,
unsub: callback,
notifier: n,
pending: make(chan interface{}),
flushed: make(chan interface{}),
lastNotification: time.Now(),
}
n.subscriptions[id] = sub
return sub, nil
}
// Remove the given subscription. If subscription is not found notificationNotFoundErr is returned.
func (n *bufferedNotifier) Unsubscribe(subid string) error {
n.mu.Lock()
sub, found := n.subscriptions[subid]
n.mu.Unlock()
if found {
// send the unsubscribe signal, this will cause the notifier not to accept new events
// for this subscription and will close the flushed channel after the last (buffered)
// notification was send to the client.
if err := n.send(subid, unsubSignal); err != nil {
return err
}
// wait for confirmation that all (buffered) events are send for this subscription.
// this ensures that the unsubscribe method response is not send before all buffered
// events for this subscription are send.
<-sub.flushed
return nil
}
return ErrNotificationNotFound
}
// Send enques the given data for the subscription with public ID on the internal queue. t returns
// an error when the notifier is stopped or the queue is full. If data is the unsubscribe signal it
// will remove the subscription with the given id from the subscription collection.
func (n *bufferedNotifier) send(id string, data interface{}) error {
n.mu.Lock()
defer n.mu.Unlock()
if n.stopped {
return errNotifierStopped
}
var (
subscription *bufferedSubscription
found bool
)
// check if subscription is associated with this connection, it might be cancelled
// (subscribe/connection closed)
if subscription, found = n.subscriptions[id]; !found {
glog.V(logger.Error).Infof("received notification for unknown subscription %s\n", id)
return ErrNotificationNotFound
}
// received the unsubscribe signal. Add it to the queue to make sure any pending notifications
// for this subscription are send. When the run loop receives this singal it will signal that
// all pending subscriptions are flushed and that the confirmation of the unsubscribe can be
// send to the user. Remove the subscriptions to make sure new notifications are not accepted.
if data == unsubSignal {
delete(n.subscriptions, id)
if subscription.unsub != nil {
subscription.unsubOnce.Do(func() { subscription.unsub(id) })
}
}
subscription.lastNotification = time.Now()
if len(n.queue) >= n.queueSize {
glog.V(logger.Warn).Infoln("too many buffered notifications -> close connection")
n.codec.Close()
return errNotificationQueueFull
}
n.queue <- &notification{subscription, data}
return nil
}
// run reads notifications from the internal queue and sends them to the client. In case of an
// error, or when the codec is closed it will cancel all active subscriptions and returns.
func (n *bufferedNotifier) run() {
defer func() {
n.mu.Lock()
defer n.mu.Unlock()
n.stopped = true
close(n.queue)
// on exit call unsubscribe callback
for id, sub := range n.subscriptions {
if sub.unsub != nil {
sub.unsubOnce.Do(func() { sub.unsub(id) })
}
close(sub.flushed)
delete(n.subscriptions, id)
}
}()
for {
select {
case notification := <-n.queue:
// It can happen that an event is raised before the RPC server was able to send the sub
// id to the client. Therefore subscriptions are marked as pending until the sub id was
// send. The RPC server will activate the subscription by closing the pending chan.
<-notification.sub.pending
if notification.data == unsubSignal {
// unsubSignal is the last accepted message for this subscription. Raise the signal
// that all buffered notifications are sent by closing the flushed channel. This
// indicates that the response for the unsubscribe can be send to the client.
close(notification.sub.flushed)
} else {
msg := n.codec.CreateNotification(notification.sub.id, notification.data)
if err := n.codec.Write(msg); err != nil {
n.codec.Close()
// unable to send notification to client, unsubscribe all subscriptions
glog.V(logger.Warn).Infof("unable to send notification - %v\n", err)
return
}
}
case <-n.codec.Closed(): // connection was closed
glog.V(logger.Debug).Infoln("codec closed, stop subscriptions")
return
}
}
}
// Marks the subscription as active. This will causes the notifications for this subscription to be
// forwarded to the client.
func (n *bufferedNotifier) activate(subid string) {
n.mu.Lock()
defer n.mu.Unlock()
if sub, found := n.subscriptions[subid]; found {
close(sub.pending)
}
}

12
rpc/server.go
View File

@ -166,7 +166,7 @@ func (s *Server) serveRequest(codec ServerCodec, singleShot bool, options CodecO
// to send notification to clients. It is thight to the codec/connection. If the
// connection is closed the notifier will stop and cancels all active subscriptions.
if options&OptionSubscriptions == OptionSubscriptions {
ctx = context.WithValue(ctx, notifierKey{}, newBufferedNotifier(codec, notificationBufferSize))
ctx = context.WithValue(ctx, notifierKey{}, newNotifier(codec))
}
s.codecsMu.Lock()
if atomic.LoadInt32(&s.run) != 1 { // server stopped
@ -247,7 +247,7 @@ func (s *Server) Stop() {
}
// createSubscription will call the subscription callback and returns the subscription id or error.
func (s *Server) createSubscription(ctx context.Context, c ServerCodec, req *serverRequest) (string, error) {
func (s *Server) createSubscription(ctx context.Context, c ServerCodec, req *serverRequest) (ID, error) {
// subscription have as first argument the context following optional arguments
args := []reflect.Value{req.callb.rcvr, reflect.ValueOf(ctx)}
args = append(args, req.args...)
@ -257,7 +257,7 @@ func (s *Server) createSubscription(ctx context.Context, c ServerCodec, req *ser
return "", reply[1].Interface().(error)
}
return reply[0].Interface().(Subscription).ID(), nil
return reply[0].Interface().(*Subscription).ID, nil
}
// handle executes a request and returns the response from the callback.
@ -273,8 +273,8 @@ func (s *Server) handle(ctx context.Context, codec ServerCodec, req *serverReque
return codec.CreateErrorResponse(&req.id, &callbackError{ErrNotificationsUnsupported.Error()}), nil
}
subid := req.args[0].String()
if err := notifier.Unsubscribe(subid); err != nil {
subid := ID(req.args[0].String())
if err := notifier.unsubscribe(subid); err != nil {
return codec.CreateErrorResponse(&req.id, &callbackError{err.Error()}), nil
}
@ -292,7 +292,7 @@ func (s *Server) handle(ctx context.Context, codec ServerCodec, req *serverReque
// active the subscription after the sub id was successfully sent to the client
activateSub := func() {
notifier, _ := NotifierFromContext(ctx)
notifier.(*bufferedNotifier).activate(subid)
notifier.activate(subid)
}
return codec.CreateResponse(req.id, subid), activateSub

2
rpc/server_test.go
View File

@ -72,7 +72,7 @@ func (s *Service) InvalidRets3() (string, string, error) {
return "", "", nil
}
func (s *Service) Subscription(ctx context.Context) (Subscription, error) {
func (s *Service) Subscription(ctx context.Context) (*Subscription, error) {
return nil, nil
}

135
rpc/subscription.go Normal file
View File

@ -0,0 +1,135 @@
// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package rpc
import (
"errors"
"sync"
"golang.org/x/net/context"
)
var (
// ErrNotificationsUnsupported is returned when the connection doesn't support notifications
ErrNotificationsUnsupported = errors.New("notifications not supported")
// ErrNotificationNotFound is returned when the notification for the given id is not found
ErrSubscriptionNotFound = errors.New("subscription not found")
)
// ID defines a psuedo random number that is used to identify RPC subscriptions.
type ID string
// a Subscription is created by a notifier and tight to that notifier. The client can use
// this subscription to wait for an unsubscribe request for the client, see Err().
type Subscription struct {
ID ID
err chan error // closed on unsubscribe
}
// Err returns a channel that is closed when the client send an unsubscribe request.
func (s *Subscription) Err() <-chan error {
return s.err
}
// notifierKey is used to store a notifier within the connection context.
type notifierKey struct{}
// Notifier is tight to a RPC connection that supports subscriptions.
// Server callbacks use the notifier to send notifications.
type Notifier struct {
codec ServerCodec
subMu sync.RWMutex // guards active and inactive maps
stopped bool
active map[ID]*Subscription
inactive map[ID]*Subscription
}
// newNotifier creates a new notifier that can be used to send subscription
// notifications to the client.
func newNotifier(codec ServerCodec) *Notifier {
return &Notifier{
codec: codec,
active: make(map[ID]*Subscription),
inactive: make(map[ID]*Subscription),
}
}
// NotifierFromContext returns the Notifier value stored in ctx, if any.
func NotifierFromContext(ctx context.Context) (*Notifier, bool) {
n, ok := ctx.Value(notifierKey{}).(*Notifier)
return n, ok
}
// CreateSubscription returns a new subscription that is coupled to the
// RPC connection. By default subscriptions are inactive and notifications
// are dropped until the subscription is marked as active. This is done
// by the RPC server after the subscription ID is send to the client.
func (n *Notifier) CreateSubscription() *Subscription {
s := &Subscription{NewID(), make(chan error)}
n.subMu.Lock()
n.inactive[s.ID] = s
n.subMu.Unlock()
return s
}
// Notify sends a notification to the client with the given data as payload.
// If an error occurs the RPC connection is closed and the error is returned.
func (n *Notifier) Notify(id ID, data interface{}) error {
n.subMu.RLock()
defer n.subMu.RUnlock()
_, active := n.active[id]
if active {
notification := n.codec.CreateNotification(string(id), data)
if err := n.codec.Write(notification); err != nil {
n.codec.Close()
return err
}
}
return nil
}
// Closed returns a channel that is closed when the RPC connection is closed.
func (n *Notifier) Closed() <-chan interface{} {
return n.codec.Closed()
}
// unsubscribe a subscription.
// If the subscription could not be found ErrSubscriptionNotFound is returned.
func (n *Notifier) unsubscribe(id ID) error {
n.subMu.Lock()
defer n.subMu.Unlock()
if s, found := n.active[id]; found {
close(s.err)
delete(n.active, id)
return nil
}
return ErrSubscriptionNotFound
}
// activate enables a subscription. Until a subscription is enabled all
// notifications are dropped. This method is called by the RPC server after
// the subscription ID was sent to client. This prevents notifications being
// send to the client before the subscription ID is send to the client.
func (n *Notifier) activate(id ID) {
n.subMu.Lock()
defer n.subMu.Unlock()
if sub, found := n.inactive[id]; found {
n.active[id] = sub
delete(n.inactive, id)
}
}

34
rpc/notification_test.go → rpc/subscription_test.go
View File

@ -50,7 +50,7 @@ func (s *NotificationTestService) Unsubscribe(subid string) {
s.mu.Unlock()
}
func (s *NotificationTestService) SomeSubscription(ctx context.Context, n, val int) (Subscription, error) {
func (s *NotificationTestService) SomeSubscription(ctx context.Context, n, val int) (*Subscription, error) {
notifier, supported := NotifierFromContext(ctx)
if !supported {
return nil, ErrNotificationsUnsupported
@ -59,17 +59,29 @@ func (s *NotificationTestService) SomeSubscription(ctx context.Context, n, val i
// by explicitly creating an subscription we make sure that the subscription id is send back to the client
// before the first subscription.Notify is called. Otherwise the events might be send before the response
// for the eth_subscribe method.
subscription, err := notifier.NewSubscription(s.Unsubscribe)
if err != nil {
return nil, err
}
subscription := notifier.CreateSubscription()
go func() {
// test expects n events, if we begin sending event immediatly some events
// will probably be dropped since the subscription ID might not be send to
// the client.
time.Sleep(5 * time.Second)
for i := 0; i < n; i++ {
if err := subscription.Notify(val + i); err != nil {
if err := notifier.Notify(subscription.ID, val+i); err != nil {
return
}
}
select {
case <-notifier.Closed():
s.mu.Lock()
s.unsubscribed = true
s.mu.Unlock()
case <-subscription.Err():
s.mu.Lock()
s.unsubscribed = true
s.mu.Unlock()
}
}()
return subscription, nil
@ -77,7 +89,7 @@ func (s *NotificationTestService) SomeSubscription(ctx context.Context, n, val i
// HangSubscription blocks on s.unblockHangSubscription before
// sending anything.
func (s *NotificationTestService) HangSubscription(ctx context.Context, val int) (Subscription, error) {
func (s *NotificationTestService) HangSubscription(ctx context.Context, val int) (*Subscription, error) {
notifier, supported := NotifierFromContext(ctx)
if !supported {
return nil, ErrNotificationsUnsupported
@ -85,12 +97,10 @@ func (s *NotificationTestService) HangSubscription(ctx context.Context, val int)
s.gotHangSubscriptionReq <- struct{}{}
<-s.unblockHangSubscription
subscription, err := notifier.NewSubscription(s.Unsubscribe)
if err != nil {
return nil, err
}
subscription := notifier.CreateSubscription()
go func() {
subscription.Notify(val)
notifier.Notify(subscription.ID, val)
}()
return subscription, nil
}

4
rpc/types.go
View File

@ -269,6 +269,6 @@ func (bn *BlockNumber) UnmarshalJSON(data []byte) error {
return fmt.Errorf("blocknumber not in range [%d, %d]", earliestBlockNumber, maxBlockNumber)
}
func (bn *BlockNumber) Int64() int64 {
return (int64)(*bn)
func (bn BlockNumber) Int64() int64 {
return (int64)(bn)
}

42
rpc/utils.go
View File

@ -17,17 +17,26 @@
package rpc
import (
"crypto/rand"
"bufio"
crand "crypto/rand"
"encoding/binary"
"encoding/hex"
"errors"
"math/big"
"math/rand"
"reflect"
"sync"
"time"
"unicode"
"unicode/utf8"
"golang.org/x/net/context"
)
var (
subscriptionIDGenMu sync.Mutex
subscriptionIDGen = idGenerator()
)
// Is this an exported - upper case - name?
func isExported(name string) bool {
rune, _ := utf8.DecodeRuneInString(name)
@ -218,11 +227,28 @@ METHODS:
return callbacks, subscriptions
}
func newSubscriptionID() (string, error) {
var subid [16]byte
n, _ := rand.Read(subid[:])
if n != 16 {
return "", errors.New("Unable to generate subscription id")
// idGenerator helper utility that generates a (pseudo) random sequence of
// bytes that are used to generate identifiers.
func idGenerator() *rand.Rand {
if seed, err := binary.ReadVarint(bufio.NewReader(crand.Reader)); err == nil {
return rand.New(rand.NewSource(seed))
}
return "0x" + hex.EncodeToString(subid[:]), nil
return rand.New(rand.NewSource(int64(time.Now().Nanosecond())))
}
// NewID generates a identifier that can be used as an identifier in the RPC interface.
// e.g. filter and subscription identifier.
func NewID() ID {
subscriptionIDGenMu.Lock()
defer subscriptionIDGenMu.Unlock()
id := make([]byte, 16)
for i := 0; i < len(id); i += 7 {
val := subscriptionIDGen.Int63()
for j := 0; i+j < len(id) && j < 7; j++ {
id[i+j] = byte(val)
val >>= 8
}
}
return ID("0x" + hex.EncodeToString(id))
}