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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| const VM = require('ethereumjs-vm') | ||
| const async = require('async') | ||
| const inherits = require('util').inherits | ||
| const FakeMerklePatriciaTree = require('fake-merkle-patricia-tree') | ||
| const ethUtil = require('ethereumjs-util') | ||
| const createPayload = require('../util/create-payload.js') | ||
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| module.exports = VmSubprovider | ||
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| function VmSubprovider(opts){ | ||
| const self = this | ||
| self.rootProvider = opts.rootProvider | ||
| self.currentBlock = 'latest' | ||
| var vm = self.vm = new VM() | ||
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| // intercept state lookups | ||
| vm.stateManager._lookupStorageTrie = self._createAccountStorageTrie.bind(self) | ||
| vm.stateManager.cache._lookupAccount = self._fetchAccount.bind(self) | ||
| } | ||
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| VmSubprovider.prototype._createAccountStorageTrie = function(address, cb){ | ||
| const self = this | ||
| var block = self.currentBlock | ||
| var storageTrie = new LazyStorageTrie({ | ||
| fetchStorage: fetchStorage, | ||
| }) | ||
| cb(null, storageTrie) | ||
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| function fetchStorage(key, cb){ | ||
| self._fetchAccountStorage(address, key, block, cb) | ||
| } | ||
| } | ||
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| VmSubprovider.prototype._emitPayload = function(payload, cb){ | ||
| const self = this | ||
| // console.log('emit payload!', payload) | ||
| self.rootProvider.sendAsync(createPayload(payload), cb) | ||
| // self.rootProvider.sendAsync(createPayload(payload), function(){ | ||
| // // console.log('payload return!', arguments) | ||
| // cb.apply(null, arguments) | ||
| // }) | ||
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| } | ||
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| VmSubprovider.prototype._fetchAccount = function(address, cb){ | ||
| const self = this | ||
| var block = self.currentBlock | ||
| console.log('fetch account:', address) | ||
| async.parallel({ | ||
| nonce: self._fetchAccountNonce.bind(self, address, block), | ||
| balance: self._fetchAccountBalance.bind(self, address, block), | ||
| _code: self._fetchAccountCode.bind(self, address, block), | ||
| }, function(err, results){ | ||
| if (err) return cb(err) | ||
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| results._exists = results.nonce !== '0x0' || results.balance != '0x0' || results._code != '0x' | ||
| // console.log('fetch account results:', results) | ||
| var account = new LazyAccount(results) | ||
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| cb(null, account) | ||
| }) | ||
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| } | ||
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| VmSubprovider.prototype._fetchAccountStorage = function(address, key, block, cb){ | ||
| const self = this | ||
| self._emitPayload({ method: 'eth_getStorageAt', params: [address, key, block] }, function(err, results){ | ||
| if (err) return cb(err) | ||
| cb(null, results.result) | ||
| }) | ||
| } | ||
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| VmSubprovider.prototype._fetchAccountBalance = function(address, block, cb){ | ||
| const self = this | ||
| self._emitPayload({ method: 'eth_getBalance', params: [address, block] }, function(err, results){ | ||
| if (err) return cb(err) | ||
| cb(null, results.result) | ||
| }) | ||
| } | ||
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| VmSubprovider.prototype._fetchAccountNonce = function(address, block, cb){ | ||
| const self = this | ||
| self._emitPayload({ method: 'eth_getTransactionCount', params: [address, block] }, function(err, results){ | ||
| if (err) return cb(err) | ||
| cb(null, results.result) | ||
| }) | ||
| } | ||
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| VmSubprovider.prototype._fetchAccountCode = function(address, block, cb){ | ||
| const self = this | ||
| self._emitPayload({ method: 'eth_getCode', params: [address, block] }, function(err, results){ | ||
| if (err) return cb(err) | ||
| cb(null, results.result) | ||
| }) | ||
| } | ||
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| // | ||
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| function LazyAccount(opts) { | ||
| const self = this | ||
| self._code = opts._code | ||
| self.exists = opts._exists | ||
| self.balance = opts.balance | ||
| self.stateRoot = '0x00' | ||
| } | ||
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| LazyAccount.prototype.serialize = function(){ | ||
| return new Buffer('') | ||
| } | ||
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| LazyAccount.prototype.setCode = function(_, value, cb){ | ||
| const self = this | ||
| self._code = value | ||
| cb() | ||
| } | ||
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| LazyAccount.prototype.getCode = function(_, cb){ | ||
| const self = this | ||
| cb(null, self._code) | ||
| } | ||
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| // | ||
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| inherits(LazyStorageTrie, FakeMerklePatriciaTree) | ||
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| function LazyStorageTrie(opts) { | ||
| const self = this | ||
| FakeMerklePatriciaTree.call(self) | ||
| self._fetchStorage = opts.fetchStorage | ||
| } | ||
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| LazyStorageTrie.prototype.get = function(key, cb){ | ||
| const self = this | ||
| var _super = FakeMerklePatriciaTree.prototype.get.bind(self) | ||
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| _super(key, function(err, value){ | ||
| if (err) return cb(err) | ||
| if (value) return cb(null, value) | ||
| // if value not in tree, try network | ||
| var keyHex = key.toString('hex') | ||
| self._fetchStorage(keyHex, function(err, rawValue){ | ||
| if (err) return cb(err) | ||
| var value = new Buffer(ethUtil.stripHexPrefix(rawValue), 'hex') | ||
| cb(null, value) | ||
| }) | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| const MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER | ||
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| module.exports = createPayload | ||
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| function createPayload(data){ | ||
| return { | ||
| id: getRandomId(), | ||
| jsonrpc: '2.0', | ||
| method: data.method, | ||
| params: data.params || [], | ||
| } | ||
| } | ||
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| function getRandomId(){ | ||
| return Math.floor(Math.random()*MAX_SAFE_INTEGER) | ||
| } |