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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 package natspec
import ( import (
"fmt"
"github.com/obscuren/otto" "github.com/obscuren/otto"
"io/ioutil"
) )
type NatSpec struct { type NatSpec struct {
jsvm *otto.Otto 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 = new(NatSpec)
self.jsvm = otto.New() 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 { if err != nil {
return return
} }
@ -27,39 +24,40 @@ func NewNATSpec(transaction string) (self *NatSpec, err error) {
return return
} }
self.jsvm.Run("var transaction = " + transaction + ";")
return 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 + "\";") if _, err = self.jsvm.Run("var abi = " + abi + ";"); err != nil {
return 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) { if _, err = self.jsvm.Run("var expression = \"" + expression + "\";"); err != nil {
return "", fmt.Errorf("natspec.js error setting expression: %v", err)
_, 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 {
self.jsvm.Run("var call = {method: method,abi: abi,transaction: transaction};") self.jsvm.Run("var call = {method: method,abi: abi,transaction: transaction};")
value, err := self.jsvm.Run("natspec.evaluateExpression(expression, call);") value, err := self.jsvm.Run("natspec.evaluateExpression(expression, call);")
if err != nil { 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
} }

91
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){ },{}],2:[function(require,module,exports){
// shim for using process in browser // shim for using process in browser
@ -291,26 +293,26 @@ if (process.env.NODE_ENV !== 'build') {
var BigNumber = require('bignumber.js'); // jshint ignore:line var BigNumber = require('bignumber.js'); // jshint ignore:line
} }
var ETH_UNITS = [ var ETH_UNITS = [
'wei', 'wei',
'Kwei', 'Kwei',
'Mwei', 'Mwei',
'Gwei', 'Gwei',
'szabo', 'szabo',
'finney', 'finney',
'ether', 'ether',
'grand', 'grand',
'Mether', 'Mether',
'Gether', 'Gether',
'Tether', 'Tether',
'Pether', 'Pether',
'Eether', 'Eether',
'Zether', 'Zether',
'Yether', 'Yether',
'Nether', 'Nether',
'Dether', 'Dether',
'Vether', 'Vether',
'Uether' 'Uether'
]; ];
module.exports = { module.exports = {
@ -375,7 +377,7 @@ var formatInputInt = function (value) {
BigNumber.config(c.ETH_BIGNUMBER_ROUNDING_MODE); BigNumber.config(c.ETH_BIGNUMBER_ROUNDING_MODE);
value = value.round(); value = value.round();
if (value.lessThan(0)) if (value.lessThan(0))
value = new BigNumber("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 16).plus(value).plus(1); value = new BigNumber("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 16).plus(value).plus(1);
value = value.toString(16); value = value.toString(16);
} }
@ -404,7 +406,7 @@ var formatInputBool = function (value) {
/// Values are multiplied by 2^m and encoded as integers /// Values are multiplied by 2^m and encoded as integers
/// @returns byte representation of real /// @returns byte representation of real
var formatInputReal = function (value) { var formatInputReal = function (value) {
return formatInputInt(new BigNumber(value).times(new BigNumber(2).pow(128))); return formatInputInt(new BigNumber(value).times(new BigNumber(2).pow(128)));
}; };
@ -436,12 +438,12 @@ var formatOutputUInt = function (value) {
/// @returns input bytes formatted to real /// @returns input bytes formatted to real
var formatOutputReal = function (value) { var formatOutputReal = function (value) {
return formatOutputInt(value).dividedBy(new BigNumber(2).pow(128)); return formatOutputInt(value).dividedBy(new BigNumber(2).pow(128));
}; };
/// @returns input bytes formatted to ureal /// @returns input bytes formatted to ureal
var formatOutputUReal = function (value) { var formatOutputUReal = function (value) {
return formatOutputUInt(value).dividedBy(new BigNumber(2).pow(128)); return formatOutputUInt(value).dividedBy(new BigNumber(2).pow(128));
}; };
/// @returns right-aligned input bytes formatted to hex /// @returns right-aligned input bytes formatted to hex
@ -524,14 +526,14 @@ var namedType = function (name) {
}; };
/// Setups input formatters for solidity types /// Setups input formatters for solidity types
/// @returns an array of input formatters /// @returns an array of input formatters
var inputTypes = function () { var inputTypes = function () {
return [ return [
{ type: prefixedType('uint'), format: f.formatInputInt }, { type: prefixedType('uint'), format: f.formatInputInt },
{ type: prefixedType('int'), format: f.formatInputInt }, { type: prefixedType('int'), format: f.formatInputInt },
{ type: prefixedType('hash'), format: f.formatInputInt }, { type: prefixedType('hash'), format: f.formatInputInt },
{ type: prefixedType('string'), format: f.formatInputString }, { type: prefixedType('string'), format: f.formatInputString },
{ type: prefixedType('real'), format: f.formatInputReal }, { type: prefixedType('real'), format: f.formatInputReal },
{ type: prefixedType('ureal'), format: f.formatInputReal }, { type: prefixedType('ureal'), format: f.formatInputReal },
{ type: namedType('address'), format: f.formatInputInt }, { type: namedType('address'), format: f.formatInputInt },
@ -620,7 +622,7 @@ var toAscii = function(hex) {
return str; return str;
}; };
var toHex = function(str) { var toHex = function(str) {
var hex = ""; var hex = "";
for(var i = 0; i < str.length; i++) { for(var i = 0; i < str.length; i++) {
@ -642,7 +644,7 @@ var fromAscii = function(str, pad) {
/// @returns display name for function/event eg. multiply(uint256) -> multiply /// @returns display name for function/event eg. multiply(uint256) -> multiply
var extractDisplayName = function (name) { var extractDisplayName = function (name) {
var length = name.indexOf('('); var length = name.indexOf('(');
return length !== -1 ? name.substr(0, length) : name; return length !== -1 ? name.substr(0, length) : name;
}; };
@ -657,8 +659,8 @@ var extractTypeName = function (name) {
/// @returns abi array with filtered objects of type 'function' /// @returns abi array with filtered objects of type 'function'
var filterFunctions = function (json) { var filterFunctions = function (json) {
return json.filter(function (current) { return json.filter(function (current) {
return current.type === 'function'; return current.type === 'function';
}); });
}; };
/// Filters all events form input abi /// Filters all events form input abi
@ -3404,7 +3406,7 @@ module.exports = {
* @date 2015 * @date 2015
*/ */
var abi = require('./node_modules/ethereum.js/lib/abi.js'); var abi = require('./node_modules/ethereum.js/lib/abi.js');
/** /**
* This object should be used to evaluate natspec expression * This object should be used to evaluate natspec expression
@ -3418,7 +3420,7 @@ var natspec = (function () {
context[key] = obj[key]; context[key] = obj[key];
}); });
} }
/// generate codes, which will be evaluated /// generate codes, which will be evaluated
var generateCode = function (obj) { var generateCode = function (obj) {
return Object.keys(obj).reduce(function (acc, key) { return Object.keys(obj).reduce(function (acc, key) {
@ -3440,20 +3442,20 @@ var natspec = (function () {
/// @returns hashmap with all contract's method input variables /// @returns hashmap with all contract's method input variables
var getMethodInputParams = function (method, transaction) { var getMethodInputParams = function (method, transaction) {
// do it with output formatter (cause we have to decode) // do it with output formatter (cause we have to decode)
var params = abi.formatOutput(method.inputs, '0x' + transaction.params[0].data.slice(10)); var params = abi.formatOutput(method.inputs, '0x' + transaction.params[0].data.slice(10));
return method.inputs.reduce(function (acc, current, index) { return method.inputs.reduce(function (acc, current, index) {
acc[current.name] = params[index]; acc[current.name] = params[index];
return acc; return acc;
}, {}); }, {});
}; };
/// Should be called to evaluate expression /// Should be called to evaluate expression
var mapExpressionsToEvaluate = function (expression, cb) { var mapExpressionsToEvaluate = function (expression, cb) {
var evaluatedExpression = ""; var evaluatedExpression = "";
// match everything in `` quotes // match everything in backtick
var pattern = /\`(?:\\.|[^`\\])*\`/gim var pattern = /\` + "`" + `(?:\\.|[^` + "`" + `\\])*\` + "`" + `/gim
var match; var match;
var lastIndex = 0; var lastIndex = 0;
while ((match = pattern.exec(expression)) !== null) { while ((match = pattern.exec(expression)) !== null) {
@ -3464,9 +3466,9 @@ var natspec = (function () {
evaluatedExpression += evaluatedPart; evaluatedExpression += evaluatedPart;
lastIndex = pattern.lastIndex; lastIndex = pattern.lastIndex;
} }
evaluatedExpression += expression.slice(lastIndex); evaluatedExpression += expression.slice(lastIndex);
return evaluatedExpression; return evaluatedExpression;
}; };
@ -3478,11 +3480,11 @@ var natspec = (function () {
var evaluateExpression = function (expression, call) { var evaluateExpression = function (expression, call) {
//var self = this; //var self = this;
var context = {}; var context = {};
if (!!call) { if (!!call) {
try { try {
var method = getMethodWithName(call.abi, call.method); var method = getMethodWithName(call.abi, call.method);
var params = getMethodInputParams(method, call.transaction); var params = getMethodInputParams(method, call.transaction);
copyToContext(params, context); copyToContext(params, context);
} }
catch (err) { catch (err) {
@ -3498,7 +3500,7 @@ var natspec = (function () {
return fn(context).toString(); return fn(context).toString();
} }
catch (err) { catch (err) {
return 'undefined'; return 'undefined';
} }
}); });
@ -3511,7 +3513,8 @@ var natspec = (function () {
})(); })();
module.exports = natspec; module.exports = natspec;
},{"./node_modules/ethereum.js/lib/abi.js":3}]},{},[]); },{"./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) { func TestNotice(t *testing.T) {
ns, err := NewNATSpec(` tx := `
{ {
"jsonrpc": "2.0", "jsonrpc": "2.0",
"method": "eth_call", "method": "eth_call",
"params": [{ "params": [{
"to": "0x8521742d3f456bd237e312d6e30724960f72517a", "to": "0x8521742d3f456bd237e312d6e30724960f72517a",
"data": "0xc6888fa1000000000000000000000000000000000000000000000000000000000000007a" "data": "0xc6888fa1000000000000000000000000000000000000000000000000000000000000007a"
}], }],
"id": 6 "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 { if err != nil {
t.Errorf("NewNATSpec error %v", err) t.Errorf("NewNATSpec error %v", err)
} }
ns.SetABI(` notice, err := ns.Notice(tx, abi, method, desc)
[{
"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 := ns.Parse() if err != nil {
t.Errorf("expected no error got %v", err)
}
expected := "Will multiply 122 by 7 and return 854." expected := "Will multiply 122 by 7 and return 854."
if notice != expected { if notice != expected {
@ -48,4 +55,42 @@ func TestNotice(t *testing.T) {
} else { } else {
t.Logf("returned notice \"%v\"", notice) 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)
}
}
} }