912 lines
33 KiB
Go
912 lines
33 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package fetcher
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import (
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"bytes"
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"errors"
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"fmt"
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mrand "math/rand"
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"sort"
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"time"
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mapset "github.com/deckarep/golang-set/v2"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/mclock"
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"github.com/ethereum/go-ethereum/core/txpool"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/metrics"
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)
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const (
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// maxTxAnnounces is the maximum number of unique transaction a peer
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// can announce in a short time.
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maxTxAnnounces = 4096
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// maxTxRetrievals is the maximum transaction number can be fetched in one
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// request. The rationale to pick 256 is:
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// - In eth protocol, the softResponseLimit is 2MB. Nowadays according to
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// Etherscan the average transaction size is around 200B, so in theory
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// we can include lots of transaction in a single protocol packet.
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// - However the maximum size of a single transaction is raised to 128KB,
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// so pick a middle value here to ensure we can maximize the efficiency
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// of the retrieval and response size overflow won't happen in most cases.
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maxTxRetrievals = 256
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// maxTxUnderpricedSetSize is the size of the underpriced transaction set that
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// is used to track recent transactions that have been dropped so we don't
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// re-request them.
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maxTxUnderpricedSetSize = 32768
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// txArriveTimeout is the time allowance before an announced transaction is
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// explicitly requested.
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txArriveTimeout = 500 * time.Millisecond
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// txGatherSlack is the interval used to collate almost-expired announces
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// with network fetches.
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txGatherSlack = 100 * time.Millisecond
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)
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var (
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// txFetchTimeout is the maximum allotted time to return an explicitly
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// requested transaction.
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txFetchTimeout = 5 * time.Second
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)
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var (
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txAnnounceInMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/in", nil)
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txAnnounceKnownMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/known", nil)
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txAnnounceUnderpricedMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/underpriced", nil)
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txAnnounceDOSMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/dos", nil)
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txBroadcastInMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/in", nil)
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txBroadcastKnownMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/known", nil)
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txBroadcastUnderpricedMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/underpriced", nil)
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txBroadcastOtherRejectMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/otherreject", nil)
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txRequestOutMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/out", nil)
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txRequestFailMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/fail", nil)
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txRequestDoneMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/done", nil)
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txRequestTimeoutMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/timeout", nil)
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txReplyInMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/in", nil)
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txReplyKnownMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/known", nil)
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txReplyUnderpricedMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/underpriced", nil)
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txReplyOtherRejectMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/otherreject", nil)
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txFetcherWaitingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/waiting/peers", nil)
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txFetcherWaitingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/waiting/hashes", nil)
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txFetcherQueueingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/queueing/peers", nil)
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txFetcherQueueingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/queueing/hashes", nil)
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txFetcherFetchingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/fetching/peers", nil)
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txFetcherFetchingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/fetching/hashes", nil)
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)
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// txAnnounce is the notification of the availability of a batch
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// of new transactions in the network.
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type txAnnounce struct {
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origin string // Identifier of the peer originating the notification
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hashes []common.Hash // Batch of transaction hashes being announced
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}
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// txRequest represents an in-flight transaction retrieval request destined to
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// a specific peers.
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type txRequest struct {
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hashes []common.Hash // Transactions having been requested
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stolen map[common.Hash]struct{} // Deliveries by someone else (don't re-request)
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time mclock.AbsTime // Timestamp of the request
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}
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// txDelivery is the notification that a batch of transactions have been added
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// to the pool and should be untracked.
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type txDelivery struct {
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origin string // Identifier of the peer originating the notification
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hashes []common.Hash // Batch of transaction hashes having been delivered
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direct bool // Whether this is a direct reply or a broadcast
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}
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// txDrop is the notification that a peer has disconnected.
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type txDrop struct {
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peer string
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}
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// TxFetcher is responsible for retrieving new transaction based on announcements.
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//
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// The fetcher operates in 3 stages:
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// - Transactions that are newly discovered are moved into a wait list.
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// - After ~500ms passes, transactions from the wait list that have not been
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// broadcast to us in whole are moved into a queueing area.
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// - When a connected peer doesn't have in-flight retrieval requests, any
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// transaction queued up (and announced by the peer) are allocated to the
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// peer and moved into a fetching status until it's fulfilled or fails.
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//
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// The invariants of the fetcher are:
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// - Each tracked transaction (hash) must only be present in one of the
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// three stages. This ensures that the fetcher operates akin to a finite
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// state automata and there's do data leak.
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// - Each peer that announced transactions may be scheduled retrievals, but
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// only ever one concurrently. This ensures we can immediately know what is
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// missing from a reply and reschedule it.
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type TxFetcher struct {
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notify chan *txAnnounce
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cleanup chan *txDelivery
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drop chan *txDrop
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quit chan struct{}
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underpriced mapset.Set[common.Hash] // Transactions discarded as too cheap (don't re-fetch)
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// Stage 1: Waiting lists for newly discovered transactions that might be
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// broadcast without needing explicit request/reply round trips.
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waitlist map[common.Hash]map[string]struct{} // Transactions waiting for an potential broadcast
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waittime map[common.Hash]mclock.AbsTime // Timestamps when transactions were added to the waitlist
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waitslots map[string]map[common.Hash]struct{} // Waiting announcements grouped by peer (DoS protection)
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// Stage 2: Queue of transactions that waiting to be allocated to some peer
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// to be retrieved directly.
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announces map[string]map[common.Hash]struct{} // Set of announced transactions, grouped by origin peer
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announced map[common.Hash]map[string]struct{} // Set of download locations, grouped by transaction hash
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// Stage 3: Set of transactions currently being retrieved, some which may be
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// fulfilled and some rescheduled. Note, this step shares 'announces' from the
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// previous stage to avoid having to duplicate (need it for DoS checks).
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fetching map[common.Hash]string // Transaction set currently being retrieved
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requests map[string]*txRequest // In-flight transaction retrievals
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alternates map[common.Hash]map[string]struct{} // In-flight transaction alternate origins if retrieval fails
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// Callbacks
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hasTx func(common.Hash) bool // Retrieves a tx from the local txpool
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addTxs func([]*types.Transaction) []error // Insert a batch of transactions into local txpool
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fetchTxs func(string, []common.Hash) error // Retrieves a set of txs from a remote peer
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step chan struct{} // Notification channel when the fetcher loop iterates
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clock mclock.Clock // Time wrapper to simulate in tests
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rand *mrand.Rand // Randomizer to use in tests instead of map range loops (soft-random)
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}
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// NewTxFetcher creates a transaction fetcher to retrieve transaction
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// based on hash announcements.
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func NewTxFetcher(hasTx func(common.Hash) bool, addTxs func([]*types.Transaction) []error, fetchTxs func(string, []common.Hash) error) *TxFetcher {
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return NewTxFetcherForTests(hasTx, addTxs, fetchTxs, mclock.System{}, nil)
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}
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// NewTxFetcherForTests is a testing method to mock out the realtime clock with
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// a simulated version and the internal randomness with a deterministic one.
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func NewTxFetcherForTests(
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hasTx func(common.Hash) bool, addTxs func([]*types.Transaction) []error, fetchTxs func(string, []common.Hash) error,
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clock mclock.Clock, rand *mrand.Rand) *TxFetcher {
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return &TxFetcher{
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notify: make(chan *txAnnounce),
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cleanup: make(chan *txDelivery),
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drop: make(chan *txDrop),
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quit: make(chan struct{}),
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waitlist: make(map[common.Hash]map[string]struct{}),
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waittime: make(map[common.Hash]mclock.AbsTime),
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waitslots: make(map[string]map[common.Hash]struct{}),
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announces: make(map[string]map[common.Hash]struct{}),
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announced: make(map[common.Hash]map[string]struct{}),
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fetching: make(map[common.Hash]string),
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requests: make(map[string]*txRequest),
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alternates: make(map[common.Hash]map[string]struct{}),
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underpriced: mapset.NewSet[common.Hash](),
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hasTx: hasTx,
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addTxs: addTxs,
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fetchTxs: fetchTxs,
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clock: clock,
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rand: rand,
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}
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}
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// Notify announces the fetcher of the potential availability of a new batch of
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// transactions in the network.
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func (f *TxFetcher) Notify(peer string, hashes []common.Hash) error {
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// Keep track of all the announced transactions
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txAnnounceInMeter.Mark(int64(len(hashes)))
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// Skip any transaction announcements that we already know of, or that we've
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// previously marked as cheap and discarded. This check is of course racy,
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// because multiple concurrent notifies will still manage to pass it, but it's
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// still valuable to check here because it runs concurrent to the internal
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// loop, so anything caught here is time saved internally.
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var (
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unknowns = make([]common.Hash, 0, len(hashes))
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duplicate, underpriced int64
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)
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for _, hash := range hashes {
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switch {
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case f.hasTx(hash):
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duplicate++
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case f.underpriced.Contains(hash):
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underpriced++
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default:
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unknowns = append(unknowns, hash)
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}
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}
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txAnnounceKnownMeter.Mark(duplicate)
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txAnnounceUnderpricedMeter.Mark(underpriced)
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// If anything's left to announce, push it into the internal loop
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if len(unknowns) == 0 {
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return nil
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}
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announce := &txAnnounce{
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origin: peer,
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hashes: unknowns,
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}
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select {
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case f.notify <- announce:
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return nil
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case <-f.quit:
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return errTerminated
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}
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}
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// Enqueue imports a batch of received transaction into the transaction pool
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// and the fetcher. This method may be called by both transaction broadcasts and
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// direct request replies. The differentiation is important so the fetcher can
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// re-schedule missing transactions as soon as possible.
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func (f *TxFetcher) Enqueue(peer string, txs []*types.Transaction, direct bool) error {
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var (
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inMeter = txReplyInMeter
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knownMeter = txReplyKnownMeter
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underpricedMeter = txReplyUnderpricedMeter
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otherRejectMeter = txReplyOtherRejectMeter
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)
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if !direct {
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inMeter = txBroadcastInMeter
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knownMeter = txBroadcastKnownMeter
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underpricedMeter = txBroadcastUnderpricedMeter
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otherRejectMeter = txBroadcastOtherRejectMeter
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}
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// Keep track of all the propagated transactions
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inMeter.Mark(int64(len(txs)))
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// Push all the transactions into the pool, tracking underpriced ones to avoid
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// re-requesting them and dropping the peer in case of malicious transfers.
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var (
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added = make([]common.Hash, 0, len(txs))
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)
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// proceed in batches
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for i := 0; i < len(txs); i += 128 {
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end := i + 128
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if end > len(txs) {
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end = len(txs)
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}
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var (
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duplicate int64
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underpriced int64
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otherreject int64
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)
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batch := txs[i:end]
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for j, err := range f.addTxs(batch) {
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// Track the transaction hash if the price is too low for us.
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// Avoid re-request this transaction when we receive another
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// announcement.
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if errors.Is(err, txpool.ErrUnderpriced) || errors.Is(err, txpool.ErrReplaceUnderpriced) {
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for f.underpriced.Cardinality() >= maxTxUnderpricedSetSize {
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f.underpriced.Pop()
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}
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f.underpriced.Add(batch[j].Hash())
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}
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// Track a few interesting failure types
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switch {
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case err == nil: // Noop, but need to handle to not count these
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case errors.Is(err, txpool.ErrAlreadyKnown):
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duplicate++
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case errors.Is(err, txpool.ErrUnderpriced) || errors.Is(err, txpool.ErrReplaceUnderpriced):
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underpriced++
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default:
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otherreject++
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}
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added = append(added, batch[j].Hash())
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}
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knownMeter.Mark(duplicate)
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underpricedMeter.Mark(underpriced)
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otherRejectMeter.Mark(otherreject)
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// If 'other reject' is >25% of the deliveries in any batch, sleep a bit.
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if otherreject > 128/4 {
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time.Sleep(200 * time.Millisecond)
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log.Warn("Peer delivering stale transactions", "peer", peer, "rejected", otherreject)
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}
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}
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select {
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case f.cleanup <- &txDelivery{origin: peer, hashes: added, direct: direct}:
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return nil
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case <-f.quit:
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return errTerminated
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}
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}
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// Drop should be called when a peer disconnects. It cleans up all the internal
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// data structures of the given node.
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func (f *TxFetcher) Drop(peer string) error {
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select {
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case f.drop <- &txDrop{peer: peer}:
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return nil
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case <-f.quit:
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return errTerminated
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}
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}
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// Start boots up the announcement based synchroniser, accepting and processing
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// hash notifications and block fetches until termination requested.
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func (f *TxFetcher) Start() {
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go f.loop()
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}
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// Stop terminates the announcement based synchroniser, canceling all pending
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// operations.
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func (f *TxFetcher) Stop() {
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close(f.quit)
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}
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func (f *TxFetcher) loop() {
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var (
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waitTimer = new(mclock.Timer)
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timeoutTimer = new(mclock.Timer)
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waitTrigger = make(chan struct{}, 1)
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timeoutTrigger = make(chan struct{}, 1)
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)
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for {
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select {
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case ann := <-f.notify:
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// Drop part of the new announcements if there are too many accumulated.
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// Note, we could but do not filter already known transactions here as
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// the probability of something arriving between this call and the pre-
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// filter outside is essentially zero.
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used := len(f.waitslots[ann.origin]) + len(f.announces[ann.origin])
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if used >= maxTxAnnounces {
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// This can happen if a set of transactions are requested but not
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// all fulfilled, so the remainder are rescheduled without the cap
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// check. Should be fine as the limit is in the thousands and the
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// request size in the hundreds.
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txAnnounceDOSMeter.Mark(int64(len(ann.hashes)))
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break
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}
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want := used + len(ann.hashes)
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if want > maxTxAnnounces {
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txAnnounceDOSMeter.Mark(int64(want - maxTxAnnounces))
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ann.hashes = ann.hashes[:want-maxTxAnnounces]
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}
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// All is well, schedule the remainder of the transactions
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idleWait := len(f.waittime) == 0
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_, oldPeer := f.announces[ann.origin]
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for _, hash := range ann.hashes {
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// If the transaction is already downloading, add it to the list
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// of possible alternates (in case the current retrieval fails) and
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// also account it for the peer.
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if f.alternates[hash] != nil {
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f.alternates[hash][ann.origin] = struct{}{}
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// Stage 2 and 3 share the set of origins per tx
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if announces := f.announces[ann.origin]; announces != nil {
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announces[hash] = struct{}{}
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} else {
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f.announces[ann.origin] = map[common.Hash]struct{}{hash: {}}
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}
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continue
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}
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// If the transaction is not downloading, but is already queued
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// from a different peer, track it for the new peer too.
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if f.announced[hash] != nil {
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f.announced[hash][ann.origin] = struct{}{}
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// Stage 2 and 3 share the set of origins per tx
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if announces := f.announces[ann.origin]; announces != nil {
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announces[hash] = struct{}{}
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} else {
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f.announces[ann.origin] = map[common.Hash]struct{}{hash: {}}
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}
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continue
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}
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// If the transaction is already known to the fetcher, but not
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// yet downloading, add the peer as an alternate origin in the
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// waiting list.
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if f.waitlist[hash] != nil {
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f.waitlist[hash][ann.origin] = struct{}{}
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if waitslots := f.waitslots[ann.origin]; waitslots != nil {
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waitslots[hash] = struct{}{}
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} else {
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f.waitslots[ann.origin] = map[common.Hash]struct{}{hash: {}}
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}
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continue
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}
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// Transaction unknown to the fetcher, insert it into the waiting list
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f.waitlist[hash] = map[string]struct{}{ann.origin: {}}
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f.waittime[hash] = f.clock.Now()
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if waitslots := f.waitslots[ann.origin]; waitslots != nil {
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waitslots[hash] = struct{}{}
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} else {
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f.waitslots[ann.origin] = map[common.Hash]struct{}{hash: {}}
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}
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}
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// If a new item was added to the waitlist, schedule it into the fetcher
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if idleWait && len(f.waittime) > 0 {
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f.rescheduleWait(waitTimer, waitTrigger)
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}
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// If this peer is new and announced something already queued, maybe
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// request transactions from them
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if !oldPeer && len(f.announces[ann.origin]) > 0 {
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f.scheduleFetches(timeoutTimer, timeoutTrigger, map[string]struct{}{ann.origin: {}})
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}
|
|
|
|
case <-waitTrigger:
|
|
// At least one transaction's waiting time ran out, push all expired
|
|
// ones into the retrieval queues
|
|
actives := make(map[string]struct{})
|
|
for hash, instance := range f.waittime {
|
|
if time.Duration(f.clock.Now()-instance)+txGatherSlack > txArriveTimeout {
|
|
// Transaction expired without propagation, schedule for retrieval
|
|
if f.announced[hash] != nil {
|
|
panic("announce tracker already contains waitlist item")
|
|
}
|
|
f.announced[hash] = f.waitlist[hash]
|
|
for peer := range f.waitlist[hash] {
|
|
if announces := f.announces[peer]; announces != nil {
|
|
announces[hash] = struct{}{}
|
|
} else {
|
|
f.announces[peer] = map[common.Hash]struct{}{hash: {}}
|
|
}
|
|
delete(f.waitslots[peer], hash)
|
|
if len(f.waitslots[peer]) == 0 {
|
|
delete(f.waitslots, peer)
|
|
}
|
|
actives[peer] = struct{}{}
|
|
}
|
|
delete(f.waittime, hash)
|
|
delete(f.waitlist, hash)
|
|
}
|
|
}
|
|
// If transactions are still waiting for propagation, reschedule the wait timer
|
|
if len(f.waittime) > 0 {
|
|
f.rescheduleWait(waitTimer, waitTrigger)
|
|
}
|
|
// If any peers became active and are idle, request transactions from them
|
|
if len(actives) > 0 {
|
|
f.scheduleFetches(timeoutTimer, timeoutTrigger, actives)
|
|
}
|
|
|
|
case <-timeoutTrigger:
|
|
// Clean up any expired retrievals and avoid re-requesting them from the
|
|
// same peer (either overloaded or malicious, useless in both cases). We
|
|
// could also penalize (Drop), but there's nothing to gain, and if could
|
|
// possibly further increase the load on it.
|
|
for peer, req := range f.requests {
|
|
if time.Duration(f.clock.Now()-req.time)+txGatherSlack > txFetchTimeout {
|
|
txRequestTimeoutMeter.Mark(int64(len(req.hashes)))
|
|
|
|
// Reschedule all the not-yet-delivered fetches to alternate peers
|
|
for _, hash := range req.hashes {
|
|
// Skip rescheduling hashes already delivered by someone else
|
|
if req.stolen != nil {
|
|
if _, ok := req.stolen[hash]; ok {
|
|
continue
|
|
}
|
|
}
|
|
// Move the delivery back from fetching to queued
|
|
if _, ok := f.announced[hash]; ok {
|
|
panic("announced tracker already contains alternate item")
|
|
}
|
|
if f.alternates[hash] != nil { // nil if tx was broadcast during fetch
|
|
f.announced[hash] = f.alternates[hash]
|
|
}
|
|
delete(f.announced[hash], peer)
|
|
if len(f.announced[hash]) == 0 {
|
|
delete(f.announced, hash)
|
|
}
|
|
delete(f.announces[peer], hash)
|
|
delete(f.alternates, hash)
|
|
delete(f.fetching, hash)
|
|
}
|
|
if len(f.announces[peer]) == 0 {
|
|
delete(f.announces, peer)
|
|
}
|
|
// Keep track of the request as dangling, but never expire
|
|
f.requests[peer].hashes = nil
|
|
}
|
|
}
|
|
// Schedule a new transaction retrieval
|
|
f.scheduleFetches(timeoutTimer, timeoutTrigger, nil)
|
|
|
|
// No idea if we scheduled something or not, trigger the timer if needed
|
|
// TODO(karalabe): this is kind of lame, can't we dump it into scheduleFetches somehow?
|
|
f.rescheduleTimeout(timeoutTimer, timeoutTrigger)
|
|
|
|
case delivery := <-f.cleanup:
|
|
// Independent if the delivery was direct or broadcast, remove all
|
|
// traces of the hash from internal trackers
|
|
for _, hash := range delivery.hashes {
|
|
if _, ok := f.waitlist[hash]; ok {
|
|
for peer, txset := range f.waitslots {
|
|
delete(txset, hash)
|
|
if len(txset) == 0 {
|
|
delete(f.waitslots, peer)
|
|
}
|
|
}
|
|
delete(f.waitlist, hash)
|
|
delete(f.waittime, hash)
|
|
} else {
|
|
for peer, txset := range f.announces {
|
|
delete(txset, hash)
|
|
if len(txset) == 0 {
|
|
delete(f.announces, peer)
|
|
}
|
|
}
|
|
delete(f.announced, hash)
|
|
delete(f.alternates, hash)
|
|
|
|
// If a transaction currently being fetched from a different
|
|
// origin was delivered (delivery stolen), mark it so the
|
|
// actual delivery won't double schedule it.
|
|
if origin, ok := f.fetching[hash]; ok && (origin != delivery.origin || !delivery.direct) {
|
|
stolen := f.requests[origin].stolen
|
|
if stolen == nil {
|
|
f.requests[origin].stolen = make(map[common.Hash]struct{})
|
|
stolen = f.requests[origin].stolen
|
|
}
|
|
stolen[hash] = struct{}{}
|
|
}
|
|
delete(f.fetching, hash)
|
|
}
|
|
}
|
|
// In case of a direct delivery, also reschedule anything missing
|
|
// from the original query
|
|
if delivery.direct {
|
|
// Mark the requesting successful (independent of individual status)
|
|
txRequestDoneMeter.Mark(int64(len(delivery.hashes)))
|
|
|
|
// Make sure something was pending, nuke it
|
|
req := f.requests[delivery.origin]
|
|
if req == nil {
|
|
log.Warn("Unexpected transaction delivery", "peer", delivery.origin)
|
|
break
|
|
}
|
|
delete(f.requests, delivery.origin)
|
|
|
|
// Anything not delivered should be re-scheduled (with or without
|
|
// this peer, depending on the response cutoff)
|
|
delivered := make(map[common.Hash]struct{})
|
|
for _, hash := range delivery.hashes {
|
|
delivered[hash] = struct{}{}
|
|
}
|
|
cutoff := len(req.hashes) // If nothing is delivered, assume everything is missing, don't retry!!!
|
|
for i, hash := range req.hashes {
|
|
if _, ok := delivered[hash]; ok {
|
|
cutoff = i
|
|
}
|
|
}
|
|
// Reschedule missing hashes from alternates, not-fulfilled from alt+self
|
|
for i, hash := range req.hashes {
|
|
// Skip rescheduling hashes already delivered by someone else
|
|
if req.stolen != nil {
|
|
if _, ok := req.stolen[hash]; ok {
|
|
continue
|
|
}
|
|
}
|
|
if _, ok := delivered[hash]; !ok {
|
|
if i < cutoff {
|
|
delete(f.alternates[hash], delivery.origin)
|
|
delete(f.announces[delivery.origin], hash)
|
|
if len(f.announces[delivery.origin]) == 0 {
|
|
delete(f.announces, delivery.origin)
|
|
}
|
|
}
|
|
if len(f.alternates[hash]) > 0 {
|
|
if _, ok := f.announced[hash]; ok {
|
|
panic(fmt.Sprintf("announced tracker already contains alternate item: %v", f.announced[hash]))
|
|
}
|
|
f.announced[hash] = f.alternates[hash]
|
|
}
|
|
}
|
|
delete(f.alternates, hash)
|
|
delete(f.fetching, hash)
|
|
}
|
|
// Something was delivered, try to reschedule requests
|
|
f.scheduleFetches(timeoutTimer, timeoutTrigger, nil) // Partial delivery may enable others to deliver too
|
|
}
|
|
|
|
case drop := <-f.drop:
|
|
// A peer was dropped, remove all traces of it
|
|
if _, ok := f.waitslots[drop.peer]; ok {
|
|
for hash := range f.waitslots[drop.peer] {
|
|
delete(f.waitlist[hash], drop.peer)
|
|
if len(f.waitlist[hash]) == 0 {
|
|
delete(f.waitlist, hash)
|
|
delete(f.waittime, hash)
|
|
}
|
|
}
|
|
delete(f.waitslots, drop.peer)
|
|
if len(f.waitlist) > 0 {
|
|
f.rescheduleWait(waitTimer, waitTrigger)
|
|
}
|
|
}
|
|
// Clean up any active requests
|
|
var request *txRequest
|
|
if request = f.requests[drop.peer]; request != nil {
|
|
for _, hash := range request.hashes {
|
|
// Skip rescheduling hashes already delivered by someone else
|
|
if request.stolen != nil {
|
|
if _, ok := request.stolen[hash]; ok {
|
|
continue
|
|
}
|
|
}
|
|
// Undelivered hash, reschedule if there's an alternative origin available
|
|
delete(f.alternates[hash], drop.peer)
|
|
if len(f.alternates[hash]) == 0 {
|
|
delete(f.alternates, hash)
|
|
} else {
|
|
f.announced[hash] = f.alternates[hash]
|
|
delete(f.alternates, hash)
|
|
}
|
|
delete(f.fetching, hash)
|
|
}
|
|
delete(f.requests, drop.peer)
|
|
}
|
|
// Clean up general announcement tracking
|
|
if _, ok := f.announces[drop.peer]; ok {
|
|
for hash := range f.announces[drop.peer] {
|
|
delete(f.announced[hash], drop.peer)
|
|
if len(f.announced[hash]) == 0 {
|
|
delete(f.announced, hash)
|
|
}
|
|
}
|
|
delete(f.announces, drop.peer)
|
|
}
|
|
// If a request was cancelled, check if anything needs to be rescheduled
|
|
if request != nil {
|
|
f.scheduleFetches(timeoutTimer, timeoutTrigger, nil)
|
|
f.rescheduleTimeout(timeoutTimer, timeoutTrigger)
|
|
}
|
|
|
|
case <-f.quit:
|
|
return
|
|
}
|
|
// No idea what happened, but bump some sanity metrics
|
|
txFetcherWaitingPeers.Update(int64(len(f.waitslots)))
|
|
txFetcherWaitingHashes.Update(int64(len(f.waitlist)))
|
|
txFetcherQueueingPeers.Update(int64(len(f.announces) - len(f.requests)))
|
|
txFetcherQueueingHashes.Update(int64(len(f.announced)))
|
|
txFetcherFetchingPeers.Update(int64(len(f.requests)))
|
|
txFetcherFetchingHashes.Update(int64(len(f.fetching)))
|
|
|
|
// Loop did something, ping the step notifier if needed (tests)
|
|
if f.step != nil {
|
|
f.step <- struct{}{}
|
|
}
|
|
}
|
|
}
|
|
|
|
// rescheduleWait iterates over all the transactions currently in the waitlist
|
|
// and schedules the movement into the fetcher for the earliest.
|
|
//
|
|
// The method has a granularity of 'gatherSlack', since there's not much point in
|
|
// spinning over all the transactions just to maybe find one that should trigger
|
|
// a few ms earlier.
|
|
func (f *TxFetcher) rescheduleWait(timer *mclock.Timer, trigger chan struct{}) {
|
|
if *timer != nil {
|
|
(*timer).Stop()
|
|
}
|
|
now := f.clock.Now()
|
|
|
|
earliest := now
|
|
for _, instance := range f.waittime {
|
|
if earliest > instance {
|
|
earliest = instance
|
|
if txArriveTimeout-time.Duration(now-earliest) < gatherSlack {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
*timer = f.clock.AfterFunc(txArriveTimeout-time.Duration(now-earliest), func() {
|
|
trigger <- struct{}{}
|
|
})
|
|
}
|
|
|
|
// rescheduleTimeout iterates over all the transactions currently in flight and
|
|
// schedules a cleanup run when the first would trigger.
|
|
//
|
|
// The method has a granularity of 'gatherSlack', since there's not much point in
|
|
// spinning over all the transactions just to maybe find one that should trigger
|
|
// a few ms earlier.
|
|
//
|
|
// This method is a bit "flaky" "by design". In theory the timeout timer only ever
|
|
// should be rescheduled if some request is pending. In practice, a timeout will
|
|
// cause the timer to be rescheduled every 5 secs (until the peer comes through or
|
|
// disconnects). This is a limitation of the fetcher code because we don't trac
|
|
// pending requests and timed out requests separately. Without double tracking, if
|
|
// we simply didn't reschedule the timer on all-timeout then the timer would never
|
|
// be set again since len(request) > 0 => something's running.
|
|
func (f *TxFetcher) rescheduleTimeout(timer *mclock.Timer, trigger chan struct{}) {
|
|
if *timer != nil {
|
|
(*timer).Stop()
|
|
}
|
|
now := f.clock.Now()
|
|
|
|
earliest := now
|
|
for _, req := range f.requests {
|
|
// If this request already timed out, skip it altogether
|
|
if req.hashes == nil {
|
|
continue
|
|
}
|
|
if earliest > req.time {
|
|
earliest = req.time
|
|
if txFetchTimeout-time.Duration(now-earliest) < gatherSlack {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
*timer = f.clock.AfterFunc(txFetchTimeout-time.Duration(now-earliest), func() {
|
|
trigger <- struct{}{}
|
|
})
|
|
}
|
|
|
|
// scheduleFetches starts a batch of retrievals for all available idle peers.
|
|
func (f *TxFetcher) scheduleFetches(timer *mclock.Timer, timeout chan struct{}, whitelist map[string]struct{}) {
|
|
// Gather the set of peers we want to retrieve from (default to all)
|
|
actives := whitelist
|
|
if actives == nil {
|
|
actives = make(map[string]struct{})
|
|
for peer := range f.announces {
|
|
actives[peer] = struct{}{}
|
|
}
|
|
}
|
|
if len(actives) == 0 {
|
|
return
|
|
}
|
|
// For each active peer, try to schedule some transaction fetches
|
|
idle := len(f.requests) == 0
|
|
|
|
f.forEachPeer(actives, func(peer string) {
|
|
if f.requests[peer] != nil {
|
|
return // continue in the for-each
|
|
}
|
|
if len(f.announces[peer]) == 0 {
|
|
return // continue in the for-each
|
|
}
|
|
hashes := make([]common.Hash, 0, maxTxRetrievals)
|
|
f.forEachHash(f.announces[peer], func(hash common.Hash) bool {
|
|
if _, ok := f.fetching[hash]; !ok {
|
|
// Mark the hash as fetching and stash away possible alternates
|
|
f.fetching[hash] = peer
|
|
|
|
if _, ok := f.alternates[hash]; ok {
|
|
panic(fmt.Sprintf("alternate tracker already contains fetching item: %v", f.alternates[hash]))
|
|
}
|
|
f.alternates[hash] = f.announced[hash]
|
|
delete(f.announced, hash)
|
|
|
|
// Accumulate the hash and stop if the limit was reached
|
|
hashes = append(hashes, hash)
|
|
if len(hashes) >= maxTxRetrievals {
|
|
return false // break in the for-each
|
|
}
|
|
}
|
|
return true // continue in the for-each
|
|
})
|
|
// If any hashes were allocated, request them from the peer
|
|
if len(hashes) > 0 {
|
|
f.requests[peer] = &txRequest{hashes: hashes, time: f.clock.Now()}
|
|
txRequestOutMeter.Mark(int64(len(hashes)))
|
|
|
|
go func(peer string, hashes []common.Hash) {
|
|
// Try to fetch the transactions, but in case of a request
|
|
// failure (e.g. peer disconnected), reschedule the hashes.
|
|
if err := f.fetchTxs(peer, hashes); err != nil {
|
|
txRequestFailMeter.Mark(int64(len(hashes)))
|
|
f.Drop(peer)
|
|
}
|
|
}(peer, hashes)
|
|
}
|
|
})
|
|
// If a new request was fired, schedule a timeout timer
|
|
if idle && len(f.requests) > 0 {
|
|
f.rescheduleTimeout(timer, timeout)
|
|
}
|
|
}
|
|
|
|
// forEachPeer does a range loop over a map of peers in production, but during
|
|
// testing it does a deterministic sorted random to allow reproducing issues.
|
|
func (f *TxFetcher) forEachPeer(peers map[string]struct{}, do func(peer string)) {
|
|
// If we're running production, use whatever Go's map gives us
|
|
if f.rand == nil {
|
|
for peer := range peers {
|
|
do(peer)
|
|
}
|
|
return
|
|
}
|
|
// We're running the test suite, make iteration deterministic
|
|
list := make([]string, 0, len(peers))
|
|
for peer := range peers {
|
|
list = append(list, peer)
|
|
}
|
|
sort.Strings(list)
|
|
rotateStrings(list, f.rand.Intn(len(list)))
|
|
for _, peer := range list {
|
|
do(peer)
|
|
}
|
|
}
|
|
|
|
// forEachHash does a range loop over a map of hashes in production, but during
|
|
// testing it does a deterministic sorted random to allow reproducing issues.
|
|
func (f *TxFetcher) forEachHash(hashes map[common.Hash]struct{}, do func(hash common.Hash) bool) {
|
|
// If we're running production, use whatever Go's map gives us
|
|
if f.rand == nil {
|
|
for hash := range hashes {
|
|
if !do(hash) {
|
|
return
|
|
}
|
|
}
|
|
return
|
|
}
|
|
// We're running the test suite, make iteration deterministic
|
|
list := make([]common.Hash, 0, len(hashes))
|
|
for hash := range hashes {
|
|
list = append(list, hash)
|
|
}
|
|
sortHashes(list)
|
|
rotateHashes(list, f.rand.Intn(len(list)))
|
|
for _, hash := range list {
|
|
if !do(hash) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// rotateStrings rotates the contents of a slice by n steps. This method is only
|
|
// used in tests to simulate random map iteration but keep it deterministic.
|
|
func rotateStrings(slice []string, n int) {
|
|
orig := make([]string, len(slice))
|
|
copy(orig, slice)
|
|
|
|
for i := 0; i < len(orig); i++ {
|
|
slice[i] = orig[(i+n)%len(orig)]
|
|
}
|
|
}
|
|
|
|
// sortHashes sorts a slice of hashes. This method is only used in tests in order
|
|
// to simulate random map iteration but keep it deterministic.
|
|
func sortHashes(slice []common.Hash) {
|
|
for i := 0; i < len(slice); i++ {
|
|
for j := i + 1; j < len(slice); j++ {
|
|
if bytes.Compare(slice[i][:], slice[j][:]) > 0 {
|
|
slice[i], slice[j] = slice[j], slice[i]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// rotateHashes rotates the contents of a slice by n steps. This method is only
|
|
// used in tests to simulate random map iteration but keep it deterministic.
|
|
func rotateHashes(slice []common.Hash, n int) {
|
|
orig := make([]common.Hash, len(slice))
|
|
copy(orig, slice)
|
|
|
|
for i := 0; i < len(orig); i++ {
|
|
slice[i] = orig[(i+n)%len(orig)]
|
|
}
|
|
}
|