141 lines
3.4 KiB
Go
141 lines
3.4 KiB
Go
package natspec
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import (
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"encoding/json"
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"fmt"
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"github.com/robertkrimen/otto"
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"strings"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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)
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type abi2method map[[8]byte]*method
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type NatSpec struct {
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jsvm *otto.Otto
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methods abi2method
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userDocJson, abiDocJson []byte
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userDoc userDoc
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// abiDoc abiDoc
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}
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// TODO: should initialise with abi and userdoc jsons
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func New() (self *NatSpec, err error) {
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// fetch abi, userdoc
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abi := []byte("")
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userdoc := []byte("")
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return NewWithDocs(abi, userdoc)
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}
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func NewWithDocs(abiDocJson, userDocJson []byte) (self *NatSpec, err error) {
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self = &NatSpec{
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jsvm: otto.New(),
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abiDocJson: abiDocJson,
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userDocJson: userDocJson,
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}
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_, err = self.jsvm.Run(natspecJS)
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if err != nil {
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return
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}
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_, err = self.jsvm.Run("var natspec = require('natspec');")
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if err != nil {
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return
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}
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err = json.Unmarshal(userDocJson, &self.userDoc)
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// err = parseAbiJson(abiDocJson, &self.abiDoc)
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return
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}
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// type abiDoc []method
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// type method struct {
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// Name string `json:name`
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// Inputs []input `json:inputs`
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// abiKey [8]byte
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// }
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// type input struct {
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// Name string `json:name`
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// Type string `json:type`
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// }
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type method struct {
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Notice string `json:notice`
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name string
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}
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type userDoc struct {
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Methods map[string]*method `json:methods`
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}
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func (self *NatSpec) makeAbi2method(abiKey [8]byte) (meth *method) {
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if self.methods != nil {
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meth = self.methods[abiKey]
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return
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}
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self.methods = make(abi2method)
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for signature, m := range self.userDoc.Methods {
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name := strings.Split(signature, "(")[0]
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hash := []byte(common.Bytes2Hex(crypto.Sha3([]byte(signature))))
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var key [8]byte
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copy(key[:], hash[:8])
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self.methods[key] = meth
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meth.name = name
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if key == abiKey {
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meth = m
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}
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}
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return
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}
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func (self *NatSpec) Notice(tx string, abi string) (notice string, err error) {
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var abiKey [8]byte
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copy(abiKey[:], []byte(abi)[:8])
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meth := self.makeAbi2method(abiKey)
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if meth == nil {
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err = fmt.Errorf("abi key %x does not match any method %v")
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return
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}
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notice, err = self.noticeForMethod(tx, meth.name, meth.Notice)
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return
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}
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func (self *NatSpec) noticeForMethod(tx string, name, expression string) (notice string, err error) {
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if _, err = self.jsvm.Run("var transaction = " + tx + ";"); err != nil {
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return "", fmt.Errorf("natspec.js error setting transaction: %v", err)
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}
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if _, err = self.jsvm.Run("var abi = " + string(self.abiDocJson) + ";"); err != nil {
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return "", fmt.Errorf("natspec.js error setting abi: %v", err)
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}
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if _, err = self.jsvm.Run("var method = '" + name + "';"); err != nil {
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return "", fmt.Errorf("natspec.js error setting method: %v", err)
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}
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if _, err = self.jsvm.Run("var expression = \"" + expression + "\";"); err != nil {
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return "", fmt.Errorf("natspec.js error setting expression: %v", err)
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}
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self.jsvm.Run("var call = {method: method,abi: abi,transaction: transaction};")
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value, err := self.jsvm.Run("natspec.evaluateExpression(expression, call);")
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if err != nil {
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return "", fmt.Errorf("natspec.js error evaluating expression: %v", err)
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}
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evalError := "Natspec evaluation failed, wrong input params"
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if value.String() == evalError {
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return "", fmt.Errorf("natspec.js error evaluating expression: wrong input params in expression '%s'", expression)
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}
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if len(value.String()) == 0 {
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return "", fmt.Errorf("natspec.js error evaluating expression")
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}
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return value.String(), nil
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}
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