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natspec for poc-9

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- put natspec.js in a heredoc string (to help binary)
- constructor takes no args, just sets up js vm
- API: only exports Notice(transaction, abi, method, expression string) (string, error)
- effort to turn natspec.js error strings to proper go errors
- test errors
This commit is contained in:
zelig 2015-03-08 20:09:13 +07:00
parent 07955b3041
commit 97dc4edb45
3 changed files with 148 additions and 102 deletions
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58
ethutil/natspec/natspec.go
View File

@ -1,24 +1,21 @@
package natspec
import (
"fmt"
"github.com/obscuren/otto"
"io/ioutil"
)
type NatSpec struct {
jsvm *otto.Otto
}
func NewNATSpec(transaction string) (self *NatSpec, err error) {
// TODO: should initialise with abi and userdoc jsons
func NewNATSpec() (self *NatSpec, err error) {
self = new(NatSpec)
self.jsvm = otto.New()
code, err := ioutil.ReadFile("natspec.js")
if err != nil {
return
}
_, err = self.jsvm.Run(string(code))
_, err = self.jsvm.Run(natspecJS)
if err != nil {
return
}
@ -27,39 +24,40 @@ func NewNATSpec(transaction string) (self *NatSpec, err error) {
return
}
self.jsvm.Run("var transaction = " + transaction + ";")
return
}
func (self *NatSpec) SetDescription(desc string) (err error) {
func (self *NatSpec) Notice(transaction, abi, method, expression string) (string, error) {
var err error
if _, err = self.jsvm.Run("var transaction = " + transaction + ";"); err != nil {
return "", fmt.Errorf("natspec.js error setting transaction: %v", err)
}
_, err = self.jsvm.Run("var expression = \"" + desc + "\";")
return
if _, err = self.jsvm.Run("var abi = " + abi + ";"); err != nil {
return "", fmt.Errorf("natspec.js error setting abi: %v", err)
}
}
if _, err = self.jsvm.Run("var method = '" + method + "';"); err != nil {
return "", fmt.Errorf("natspec.js error setting method: %v", err)
}
func (self *NatSpec) SetABI(abi string) (err error) {
_, err = self.jsvm.Run("var abi = " + abi + ";")
return
}
func (self *NatSpec) SetMethod(method string) (err error) {
_, err = self.jsvm.Run("var method = '" + method + "';")
return
}
func (self *NatSpec) Parse() string {
if _, err = self.jsvm.Run("var expression = \"" + expression + "\";"); err != nil {
return "", fmt.Errorf("natspec.js error setting expression: %v", err)
}
self.jsvm.Run("var call = {method: method,abi: abi,transaction: transaction};")
value, err := self.jsvm.Run("natspec.evaluateExpression(expression, call);")
if err != nil {
return err.Error()
return "", fmt.Errorf("natspec.js error evaluating expression: %v", err)
}
return value.String()
evalError := "Natspec evaluation failed, wrong input params"
if value.String() == evalError {
return "", fmt.Errorf("natspec.js error evaluating expression: wrong input params in expression '%s'", expression)
}
if len(value.String()) == 0 {
return "", fmt.Errorf("natspec.js error evaluating expression")
}
return value.String(), nil
}

9
ethutil/natspec/natspec.js → ethutil/natspec/natspec_js.go
View File

@ -1,4 +1,6 @@
require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
package natspec
const natspecJS = `require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
},{}],2:[function(require,module,exports){
// shim for using process in browser
@ -3452,8 +3454,8 @@ var natspec = (function () {
var mapExpressionsToEvaluate = function (expression, cb) {
var evaluatedExpression = "";
// match everything in `` quotes
var pattern = /\`(?:\\.|[^`\\])*\`/gim
// match everything in backtick
var pattern = /\` + "`" + `(?:\\.|[^` + "`" + `\\])*\` + "`" + `/gim
var match;
var lastIndex = 0;
while ((match = pattern.exec(expression)) !== null) {
@ -3515,3 +3517,4 @@ module.exports = natspec;
},{"./node_modules/ethereum.js/lib/abi.js":3}]},{},[]);
`

101
ethutil/natspec/natspec_test.go
View File

@ -6,41 +6,48 @@ import (
func TestNotice(t *testing.T) {
ns, err := NewNATSpec(`
tx := `
{
"jsonrpc": "2.0",
"method": "eth_call",
"params": [{
"to": "0x8521742d3f456bd237e312d6e30724960f72517a",
"data": "0xc6888fa1000000000000000000000000000000000000000000000000000000000000007a"
}],
"id": 6
}
`)
"jsonrpc": "2.0",
"method": "eth_call",
"params": [{
"to": "0x8521742d3f456bd237e312d6e30724960f72517a",
"data": "0xc6888fa1000000000000000000000000000000000000000000000000000000000000007a"
}],
"id": 6
}
`
abi := `
[{
"name": "multiply",
"constant": false,
"type": "function",
"inputs": [{
"name": "a",
"type": "uint256"
}],
"outputs": [{
"name": "d",
"type": "uint256"
}]
}]
`
desc := "Will multiply `a` by 7 and return `a * 7`."
method := "multiply"
ns, err := NewNATSpec()
if err != nil {
t.Errorf("NewNATSpec error %v", err)
}
ns.SetABI(`
[{
"name": "multiply",
"constant": false,
"type": "function",
"inputs": [{
"name": "a",
"type": "uint256"
}],
"outputs": [{
"name": "d",
"type": "uint256"
}]
}]
`)
ns.SetDescription("Will multiply `a` by 7 and return `a * 7`.")
ns.SetMethod("multiply")
notice, err := ns.Notice(tx, abi, method, desc)
notice := ns.Parse()
if err != nil {
t.Errorf("expected no error got %v", err)
}
expected := "Will multiply 122 by 7 and return 854."
if notice != expected {
@ -48,4 +55,42 @@ func TestNotice(t *testing.T) {
} else {
t.Logf("returned notice \"%v\"", notice)
}
notice, err = ns.Notice(tx, abi, method, "Will multiply 122 by \"7\" and return 854.")
expected = "natspec.js error setting expression: (anonymous): Line 1:41 Unexpected number"
if err == nil {
t.Errorf("expected error, got nothing (notice: '%v')", err, notice)
} else {
if err.Error() != expected {
t.Errorf("expected error '%s' got '%v' (notice: '%v')", expected, err, notice)
}
}
// badDesc := "Will multiply `e` by 7 and return `a * 7`."
// notice, err = ns.Notice(tx, abi, method, badDesc)
// expected = "natspec.js error evaluating expression: wrong input param in expression ''"
// if err == nil {
// t.Errorf("expected error, got nothing (notice: '%v')", notice)
// } else {
// if err.Error() != expected {
// t.Errorf("expected error '%s' got '%v' (notice: '%v')", expected, err, notice)
// }
// }
notice, err = ns.Notice(tx, abi, "missing_method", desc)
expected = "natspec.js error evaluating expression: wrong input params in expression 'Will multiply `a` by 7 and return `a * 7`.'"
if err == nil {
t.Errorf("expected error, got nothing (notice: '%v')", notice)
} else {
if err.Error() != expected {
t.Errorf("expected error '%s' got '%v' (notice: '%v')", expected, err, notice)
}
}
}