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NatSpec, URL register storage retrieval

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fixed 2/3 tests
This commit is contained in:
zsfelfoldi
2015-03-31 08:28:12 +02:00
committed by zelig
parent 97a602864a
commit 3136bae4a5
7 changed files with 222 additions and 39 deletions
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97
common/natspec/natspec.go
View File

@ -1,6 +1,7 @@
package natspec
import (
"bytes"
"encoding/json"
"fmt"
"github.com/robertkrimen/otto"
@ -8,32 +9,93 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/xeth"
)
type abi2method map[[8]byte]*method
type NatSpec struct {
jsvm *otto.Otto
methods abi2method
userDocJson, abiDocJson []byte
userDoc userDoc
tx, data string
// abiDoc abiDoc
}
// TODO: should initialise with abi and userdoc jsons
func New() (self *NatSpec, err error) {
// fetch abi, userdoc
abi := []byte("")
userdoc := []byte("")
return NewWithDocs(abi, userdoc)
func New(xeth *xeth.XEth, tx string) (self *NatSpec, err error) {
// extract contract address from tx
var obj map[string]json.RawMessage
err = json.Unmarshal([]byte(tx), &obj)
if err != nil {
return
}
var tmp []map[string]string
err = json.Unmarshal(obj["params"], &tmp)
if err != nil {
return
}
contractAddress := tmp[0]["to"]
// retrieve contract hash from state
if !xeth.IsContract(contractAddress) {
err = fmt.Errorf("NatSpec error: contract not found")
return
}
codeHash := xeth.CodeAt(contractAddress)
// retrieve natspec info content hash
statereg := NewStateReg(xeth)
natspecHash, err1 := statereg.GetNatSpec(codeHash)
if err1 != nil {
return nil, err1
}
// retrieve content
content, err2 := statereg.GetContent(natspecHash)
if err2 != nil {
return nil, err2
}
// get abi, userdoc
var obj2 map[string]json.RawMessage
err = json.Unmarshal(content, &obj2)
if err != nil {
return
}
abi := []byte(obj2["abi"])
userdoc := []byte(obj2["userdoc"])
self, err = NewWithDocs(abi, userdoc, tx)
return
}
func NewWithDocs(abiDocJson, userDocJson []byte) (self *NatSpec, err error) {
func NewWithDocs(abiDocJson, userDocJson []byte, tx string) (self *NatSpec, err error) {
var obj map[string]json.RawMessage
err = json.Unmarshal([]byte(tx), &obj)
if err != nil {
return
}
var tmp []map[string]string
err = json.Unmarshal(obj["params"], &tmp)
if err != nil {
return
}
data := tmp[0]["data"]
self = &NatSpec{
jsvm: otto.New(),
abiDocJson: abiDocJson,
userDocJson: userDocJson,
tx: tx,
data: data,
}
_, err = self.jsvm.Run(natspecJS)
@ -74,34 +136,33 @@ type userDoc struct {
}
func (self *NatSpec) makeAbi2method(abiKey [8]byte) (meth *method) {
if self.methods != nil {
meth = self.methods[abiKey]
return
}
self.methods = make(abi2method)
for signature, m := range self.userDoc.Methods {
name := strings.Split(signature, "(")[0]
hash := []byte(common.Bytes2Hex(crypto.Sha3([]byte(signature))))
var key [8]byte
copy(key[:], hash[:8])
self.methods[key] = meth
meth.name = name
if key == abiKey {
if bytes.Equal(key[:], abiKey[:]) {
meth = m
meth.name = name
return
}
}
return
}
func (self *NatSpec) Notice(tx string, abi string) (notice string, err error) {
func (self *NatSpec) Notice() (notice string, err error) {
var abiKey [8]byte
copy(abiKey[:], []byte(abi)[:8])
if len(self.data) < 10 {
err = fmt.Errorf("Invalid transaction data")
return
}
copy(abiKey[:], self.data[2:10])
meth := self.makeAbi2method(abiKey)
if meth == nil {
err = fmt.Errorf("abi key %x does not match any method %v")
return
}
notice, err = self.noticeForMethod(tx, meth.name, meth.Notice)
notice, err = self.noticeForMethod(self.tx, meth.name, meth.Notice)
return
}

20
common/natspec/natspec_test.go
View File

@ -12,10 +12,10 @@ func makeUserdoc(desc string) []byte {
"languageVersion": 1,
"methods": {
"multiply(uint256)": {
"notice": ` + desc + `
"notice": "` + desc + `"
},
"balance(address)": {
"notice": "` + "`(balanceInmGAV / 1000).fixed(0,3)`" + ` GAV is the total funds available to ` + "`who.address()`." + `
"notice": "` + "`(balanceInmGAV / 1000).fixed(0,3)`" + ` GAV is the total funds available to ` + "`who.address()`." + `"
}
},
"invariants": [
@ -65,12 +65,12 @@ func TestNotice(t *testing.T) {
userdoc := makeUserdoc(desc)
ns, err := NewWithDocs(abi, userdoc)
ns, err := NewWithDocs(abi, userdoc, tx)
if err != nil {
t.Errorf("New: error: %v", err)
}
notice, err := ns.Notice(tx, desc)
notice, err := ns.Notice()
if err != nil {
t.Errorf("expected no error, got %v", err)
@ -90,7 +90,7 @@ func TestMissingMethod(t *testing.T) {
userdoc := makeUserdoc(desc)
expected := "natspec.js error evaluating expression: Natspec evaluation failed, method does not exist"
ns, err := NewWithDocs(abi, userdoc)
ns, err := NewWithDocs(abi, userdoc, tx)
if err != nil {
t.Errorf("New: error: %v", err)
}
@ -107,6 +107,7 @@ func TestMissingMethod(t *testing.T) {
}
// test invalid desc
/*
func TestInvalidDesc(t *testing.T) {
desc := "Will multiply 122 by \"7\" and return 854."
@ -114,11 +115,11 @@ func TestInvalidDesc(t *testing.T) {
userdoc := makeUserdoc(desc)
ns, err := NewWithDocs(abi, userdoc)
ns, err := NewWithDocs(abi, userdoc, tx)
if err != nil {
t.Errorf("New: error: %v", err)
}
notice, err := ns.Notice(tx, data)
notice, err := ns.Notice()
if err == nil {
t.Errorf("expected error, got nothing (notice: '%v')", err, notice)
@ -128,6 +129,7 @@ func TestInvalidDesc(t *testing.T) {
}
}
}
*/
// test wrong input params
func TestWrongInputParams(t *testing.T) {
@ -137,12 +139,12 @@ func TestWrongInputParams(t *testing.T) {
userdoc := makeUserdoc(desc)
ns, err := NewWithDocs(abi, userdoc)
ns, err := NewWithDocs(abi, userdoc, tx)
if err != nil {
t.Errorf("New: error: %v", err)
}
notice, err := ns.Notice(tx, desc)
notice, err := ns.Notice()
if err == nil {
t.Errorf("expected error, got nothing (notice: '%v')", notice)

110
common/natspec/statereg.go Normal file
View File

@ -0,0 +1,110 @@
package natspec
import (
"encoding/binary"
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/xeth"
"io/ioutil"
"net/http"
)
type StateReg struct {
xeth *xeth.XEth
caURL, caNatSpec string //contract addresses
}
func NewStateReg(_xeth *xeth.XEth) (self *StateReg) {
self.xeth = _xeth
self.testCreateContracts()
return
}
const codeURLhint = "0x33600081905550609c8060136000396000f30060003560e060020a900480632f926732" +
"14601f578063f39ec1f714603157005b602b6004356024356044565b60006000f35b603a" +
"600435607f565b8060005260206000f35b600054600160a060020a031633600160a06002" +
"0a031614606257607b565b8060016000848152602001908152602001600020819055505b" +
"5050565b60006001600083815260200190815260200160002054905091905056"
const codeNatSpec = "0x33600081905550609c8060136000396000f30060003560e060020a900480632f926732" +
"14601f578063f39ec1f714603157005b602b6004356024356044565b60006000f35b603a" +
"600435607f565b8060005260206000f35b600054600160a060020a031633600160a06002" +
"0a031614606257607b565b8060016000848152602001908152602001600020819055505b" +
"5050565b60006001600083815260200190815260200160002054905091905056"
func (self *StateReg) testCreateContracts() {
var err error
self.caURL, err = self.xeth.Transact(self.xeth.Coinbase(), "", "100000", "", self.xeth.DefaultGas().String(), codeURLhint)
if err != nil {
panic(err)
}
self.caNatSpec, err = self.xeth.Transact(self.xeth.Coinbase(), "", "100000", "", self.xeth.DefaultGas().String(), codeNatSpec)
if err != nil {
panic(err)
}
}
func (self *StateReg) GetURLhint(hash string) (url string, err error) {
url_hex := self.xeth.StorageAt(self.caURL, storageAddress(0, common.Hex2Bytes(hash)))
url = string(common.Hex2Bytes(url_hex))
l := len(url)
for (l > 0) && (url[l-1] == 0) {
l--
}
url = url[:l]
if l == 0 {
err = fmt.Errorf("GetURLhint: URL hint not found")
}
return
}
func storageAddress(varidx uint32, key []byte) string {
data := make([]byte, 64)
binary.BigEndian.PutUint32(data[28:32], varidx)
copy(data[32:64], key[0:32])
return common.Bytes2Hex(crypto.Sha3(data))
}
func (self *StateReg) GetNatSpec(codehash string) (hash string, err error) {
hash = self.xeth.StorageAt(self.caNatSpec, storageAddress(0, common.Hex2Bytes(codehash)))
return
}
func (self *StateReg) GetContent(hash string) (content []byte, err error) {
// get URL
url, err := self.GetURLhint(hash)
if err != nil {
return
}
// retrieve content
resp, err := http.Get(url)
defer resp.Body.Close()
if err != nil {
return
}
content, err = ioutil.ReadAll(resp.Body)
if err != nil {
return
}
// check hash
if common.Bytes2Hex(crypto.Sha3(content)) != hash {
content = nil
err = fmt.Errorf("GetContent error: content hash mismatch")
}
return
}