package.json

  "main": "index.js",

  "scripts": {

    "test": "node test/index.js",

    "prepublish": "npm run build && npm run bundle",

    "build": "babel zero.js index.js -d dist/es5 && babel subproviders -d dist/es5/subproviders && babel util -d dist/es5/util",

    "bundle": "mkdir -p ./dist && npm run bundle-engine && npm run bundle-zero",

    "bundle-zero": "browserify -s ZeroClientProvider -e zero.js -t [ babelify --presets [ es2015 ] ] > dist/ZeroClientProvider.js",

    "bundle-engine": "browserify -s ProviderEngine -e index.js -t [ babelify --presets [ es2015 ] ] > dist/ProviderEngine.js"

  },

从script可以看出来，运行该项目，首先要prepublish

npm run prepublish

作用就是将根目录下的index.js\zero.js\subproviders和util文件夹中的所有文件都使用babel转成es5的版本，存放在dist文件夹中。然后分别使用browserify将index.js\zero.js转成es5版本的dist/ProviderEngine.js\dist/ZeroClientProvider.js

browserify命令行参数意思：

–transform, -t: 对上层文件进行转换

–entry, -e: 应用程序的入口

–standalone -s: 生成一个UMB的绑定的接口，提供给其他模块使用。

返回：

> web3-provider-engine@14.1. prepublish /Users/wanghui/provider-engine-master

> npm run build && npm run bundle

> web3-provider-engine@14.1. build /Users/wanghui/provider-engine-master

> babel zero.js index.js -d dist/es5 && babel subproviders -d dist/es5/subproviders && babel util -d dist/es5/util

zero.js -> dist/es5/zero.js

index.js -> dist/es5/index.js

subproviders/cache.js -> dist/es5/subproviders/cache.js

subproviders/default-fixture.js -> dist/es5/subproviders/default-fixture.js

subproviders/etherscan.js -> dist/es5/subproviders/etherscan.js

subproviders/fetch.js -> dist/es5/subproviders/fetch.js

subproviders/filters.js -> dist/es5/subproviders/filters.js

subproviders/fixture.js -> dist/es5/subproviders/fixture.js

subproviders/gasprice.js -> dist/es5/subproviders/gasprice.js

subproviders/hooked-wallet-ethtx.js -> dist/es5/subproviders/hooked-wallet-ethtx.js

subproviders/hooked-wallet.js -> dist/es5/subproviders/hooked-wallet.js

subproviders/inflight-cache.js -> dist/es5/subproviders/inflight-cache.js

subproviders/infura.js -> dist/es5/subproviders/infura.js

subproviders/ipc.js -> dist/es5/subproviders/ipc.js

subproviders/nonce-tracker.js -> dist/es5/subproviders/nonce-tracker.js

subproviders/provider.js -> dist/es5/subproviders/provider.js

subproviders/rpc.js -> dist/es5/subproviders/rpc.js

subproviders/sanitizer.js -> dist/es5/subproviders/sanitizer.js

subproviders/stream.js -> dist/es5/subproviders/stream.js

subproviders/subprovider.js -> dist/es5/subproviders/subprovider.js

subproviders/subscriptions.js -> dist/es5/subproviders/subscriptions.js

subproviders/vm.js -> dist/es5/subproviders/vm.js

subproviders/wallet.js -> dist/es5/subproviders/wallet.js

subproviders/websocket.js -> dist/es5/subproviders/websocket.js

subproviders/whitelist.js -> dist/es5/subproviders/whitelist.js

util/assert.js -> dist/es5/util/assert.js

util/async.js -> dist/es5/util/async.js

util/create-payload.js -> dist/es5/util/create-payload.js

util/estimate-gas.js -> dist/es5/util/estimate-gas.js

util/random-id.js -> dist/es5/util/random-id.js

util/rpc-cache-utils.js -> dist/es5/util/rpc-cache-utils.js

util/rpc-hex-encoding.js -> dist/es5/util/rpc-hex-encoding.js

util/stoplight.js -> dist/es5/util/stoplight.js

> web3-provider-engine@14.1. bundle /Users/wanghui/provider-engine-master

> mkdir -p ./dist && npm run bundle-engine && npm run bundle-zero

> web3-provider-engine@14.1. bundle-engine /Users/wanghui/provider-engine-master

> browserify -s ProviderEngine -e index.js -t [ babelify --presets [ es2015 ] ] > dist/ProviderEngine.js

> web3-provider-engine@14.1. bundle-zero /Users/wanghui/provider-engine-master

> browserify -s ZeroClientProvider -e zero.js -t [ babelify --presets [ es2015 ] ] > dist/ZeroClientProvider.js

然后运行test:

npm run test

返回：

> web3-provider-engine@14.1. test /Users/wanghui/provider-engine-master

> node test/index.js

(node:) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.

TAP version

# fallthrough test

ok  did not error

ok  has response

ok  providerA did see "test_rpc"

ok  providerA did NOT handle "test_rpc"

ok  providerB did see "test_rpc"

ok  providerB did handle "test_rpc"

ok  providerC did NOT see "test_rpc"

ok  providerC did NOT handle "test_rpc"

# cacheIdentifierForPayload for latest block

ok  cacheIds are unique

# blockTagForPayload for different methods

ok  block tag for eth_getBalance is correct

ok  block tag for eth_getCode is correct

ok  block tag for eth_getTransactionCount is correct

ok  block tag for eth_getStorageAt is correct

ok  block tag for eth_call is correct

ok  block tag for eth_estimateGas is correct

ok  block tag for eth_getBlockByNumber is correct

# cache - skipCache - true

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did NOT handle "eth_getBalance"

ok  handlingProvider did see "eth_getBalance"

ok  handlingProvider did handle "eth_getBalance"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did handle "eth_getBalance"

ok  handlingProvider did NOT see "eth_getBalance"

ok  handlingProvider did NOT handle "eth_getBalance"

# cache - skipCache - false

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did NOT handle "eth_getBalance"

ok  handlingProvider did see "eth_getBalance"

ok  handlingProvider did handle "eth_getBalance"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did handle "eth_getBalance"

ok  handlingProvider did NOT see "eth_getBalance"

ok  handlingProvider did NOT handle "eth_getBalance"

# cache - getBalance + undefined blockTag

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did NOT handle "eth_getBalance"

ok  handlingProvider did see "eth_getBalance"

ok  handlingProvider did handle "eth_getBalance"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did handle "eth_getBalance"

ok  handlingProvider did NOT see "eth_getBalance"

ok  handlingProvider did NOT handle "eth_getBalance"

# cache - getBalance + latest blockTag

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did NOT handle "eth_getBalance"

ok  handlingProvider did see "eth_getBalance"

ok  handlingProvider did handle "eth_getBalance"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did handle "eth_getBalance"

ok  handlingProvider did NOT see "eth_getBalance"

ok  handlingProvider did NOT handle "eth_getBalance"

# cache - getBalance + pending blockTag

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did NOT handle "eth_getBalance"

ok  handlingProvider did see "eth_getBalance"

ok  handlingProvider did handle "eth_getBalance"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did handle "eth_getBalance"

ok  handlingProvider did NOT see "eth_getBalance"

ok  handlingProvider did NOT handle "eth_getBalance"

# cache - getTransactionByHash for transaction that doesn't exist

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getTransactionByHash"

ok  cacheProvider did NOT handle "eth_getTransactionByHash"

ok  handlingProvider did see "eth_getTransactionByHash"

ok  handlingProvider did handle "eth_getTransactionByHash"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getTransactionByHash"

ok  cacheProvider did handle "eth_getTransactionByHash"

ok  handlingProvider did NOT see "eth_getTransactionByHash"

ok  handlingProvider did NOT handle "eth_getTransactionByHash"

# cache - getTransactionByHash for transaction that's pending

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getTransactionByHash"

ok  cacheProvider did NOT handle "eth_getTransactionByHash"

ok  handlingProvider did see "eth_getTransactionByHash"

ok  handlingProvider did handle "eth_getTransactionByHash"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getTransactionByHash"

ok  cacheProvider did handle "eth_getTransactionByHash"

ok  handlingProvider did NOT see "eth_getTransactionByHash"

ok  handlingProvider did NOT handle "eth_getTransactionByHash"

# cache - getTransactionByHash for mined transaction

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getTransactionByHash"

ok  cacheProvider did NOT handle "eth_getTransactionByHash"

ok  handlingProvider did see "eth_getTransactionByHash"

ok  handlingProvider did handle "eth_getTransactionByHash"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getTransactionByHash"

ok  cacheProvider did handle "eth_getTransactionByHash"

ok  handlingProvider did NOT see "eth_getTransactionByHash"

ok  handlingProvider did NOT handle "eth_getTransactionByHash"

# cache - getCode for latest block, then for earliest block, should not return cached response on second request

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getCode"

ok  cacheProvider did NOT handle "eth_getCode"

ok  handlingProvider did see "eth_getCode"

ok  handlingProvider did handle "eth_getCode"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getCode"

ok  cacheProvider did handle "eth_getCode"

ok  handlingProvider did NOT see "eth_getCode"

ok  handlingProvider did NOT handle "eth_getCode"

# cache - getCode for a specific block, then for the one before it, should not return cached response on second request

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getCode"

ok  cacheProvider did NOT handle "eth_getCode"

ok  handlingProvider did see "eth_getCode"

ok  handlingProvider did handle "eth_getCode"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getCode"

ok  cacheProvider did handle "eth_getCode"

ok  handlingProvider did NOT see "eth_getCode"

ok  handlingProvider did NOT handle "eth_getCode"

# cache - getCode for a specific block, then the one after it, should return cached response on second request

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getCode"

ok  cacheProvider did NOT handle "eth_getCode"

ok  handlingProvider did see "eth_getCode"

ok  handlingProvider did handle "eth_getCode"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getCode"

ok  cacheProvider did handle "eth_getCode"

ok  handlingProvider did NOT see "eth_getCode"

ok  handlingProvider did NOT handle "eth_getCode"

# cache - getCode for an unspecified block, then for the latest, should return cached response on second request

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getCode"

ok  cacheProvider did NOT handle "eth_getCode"

ok  handlingProvider did see "eth_getCode"

ok  handlingProvider did handle "eth_getCode"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getCode"

ok  cacheProvider did handle "eth_getCode"

ok  handlingProvider did NOT see "eth_getCode"

ok  handlingProvider did NOT handle "eth_getCode"

# cache - getBlockForNumber for latest then block

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did NOT handle "eth_getBlockByNumber"

ok  handlingProvider did see "eth_getBlockByNumber"

ok  handlingProvider did handle "eth_getBlockByNumber"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did handle "eth_getBlockByNumber"

ok  handlingProvider did NOT see "eth_getBlockByNumber"

ok  handlingProvider did NOT handle "eth_getBlockByNumber"

# cache - getBlockForNumber for latest then block

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did NOT handle "eth_getBlockByNumber"

ok  handlingProvider did see "eth_getBlockByNumber"

ok  handlingProvider did handle "eth_getBlockByNumber"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did handle "eth_getBlockByNumber"

ok  handlingProvider did NOT see "eth_getBlockByNumber"

ok  handlingProvider did NOT handle "eth_getBlockByNumber"

# cache - getBlockForNumber for  then block

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did NOT handle "eth_getBlockByNumber"

ok  handlingProvider did see "eth_getBlockByNumber"

ok  handlingProvider did handle "eth_getBlockByNumber"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did handle "eth_getBlockByNumber"

ok  handlingProvider did NOT see "eth_getBlockByNumber"

ok  handlingProvider did NOT handle "eth_getBlockByNumber"

# cache - getBlockForNumber for block

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did NOT handle "eth_getBlockByNumber"

ok  handlingProvider did see "eth_getBlockByNumber"

ok  handlingProvider did handle "eth_getBlockByNumber"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did handle "eth_getBlockByNumber"

ok  handlingProvider did NOT see "eth_getBlockByNumber"

ok  handlingProvider did NOT handle "eth_getBlockByNumber"

# cache - getBlockForNumber for block

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did NOT handle "eth_getBlockByNumber"

ok  handlingProvider did see "eth_getBlockByNumber"

ok  handlingProvider did handle "eth_getBlockByNumber"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did handle "eth_getBlockByNumber"

ok  handlingProvider did NOT see "eth_getBlockByNumber"

ok  handlingProvider did NOT handle "eth_getBlockByNumber"

# cache - getStorageAt for same block should cache

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getStorageAt"

ok  cacheProvider did NOT handle "eth_getStorageAt"

ok  handlingProvider did see "eth_getStorageAt"

ok  handlingProvider did handle "eth_getStorageAt"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getStorageAt"

ok  cacheProvider did handle "eth_getStorageAt"

ok  handlingProvider did NOT see "eth_getStorageAt"

ok  handlingProvider did NOT handle "eth_getStorageAt"

# cache - getStorageAt for different block should not cache

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getStorageAt"

ok  cacheProvider did NOT handle "eth_getStorageAt"

ok  handlingProvider did see "eth_getStorageAt"

ok  handlingProvider did handle "eth_getStorageAt"

ok  did not error

ok  has response

ok  cacheProvider did see "eth_getStorageAt"

ok  cacheProvider did handle "eth_getStorageAt"

ok  handlingProvider did NOT see "eth_getStorageAt"

ok  handlingProvider did NOT handle "eth_getStorageAt"

# inflight cache - getBalance for latest

ok  did not error

ok  has responses

ok  cacheProvider did see "eth_getBalance"

ok  cacheProvider did NOT handle "eth_getBalance"

ok  handlingProvider did see "eth_getBalance"

ok  handlingProvider did handle "eth_getBalance"

# inflight cache - getBlock for latest

ok  did not error

ok  has responses

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did NOT handle "eth_getBlockByNumber"

ok  handlingProvider did see "eth_getBlockByNumber"

ok  handlingProvider did handle "eth_getBlockByNumber"

# inflight cache - getBlock for latest then

ok  did not error

ok  has responses

ok  cacheProvider did see "eth_getBlockByNumber"

ok  cacheProvider did NOT handle "eth_getBlockByNumber"

ok  handlingProvider did see "eth_getBlockByNumber"

ok  handlingProvider did handle "eth_getBlockByNumber"

# filters - basic block filter

ok  did not error

ok  has response

ok  filterProvider did see "eth_newBlockFilter"

ok  filterProvider did handle "eth_newBlockFilter"

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  correct result

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  did not error

# filters - log filter - basic

ok  did not error

ok  has response

ok  filterProvider did see "eth_newFilter"

ok  filterProvider did handle "eth_newFilter"

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  correct result

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  did not error

# filters - log filter - mixed case

ok  did not error

ok  has response

ok  filterProvider did see "eth_newFilter"

ok  filterProvider did handle "eth_newFilter"

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  correct result

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  did not error

# filters - log filter - address array

ok  did not error

ok  has response

ok  filterProvider did see "eth_newFilter"

ok  filterProvider did handle "eth_newFilter"

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  correct result

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  did not error

# filters - log filter - and logic

ok  did not error

ok  has response

ok  filterProvider did see "eth_newFilter"

ok  filterProvider did handle "eth_newFilter"

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  correct result

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  did not error

# filters - log filter - or logic

ok  did not error

ok  has response

ok  filterProvider did see "eth_newFilter"

ok  filterProvider did handle "eth_newFilter"

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  correct result

ok  correct result

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  did not error

# filters - log filter - wildcard logic

ok  did not error

ok  has response

ok  filterProvider did see "eth_newFilter"

ok  filterProvider did handle "eth_newFilter"

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  correct result

ok  correct result

ok  did not error

ok  did not error

ok  has response

ok  filterProvider did see "eth_getFilterChanges"

ok  filterProvider did handle "eth_getFilterChanges"

ok  correct number of results

ok  did not error

# filters - eth_getFilterLogs called with non log filter id should return []

ok  did not error

ok  has response

ok  filterProvider did see "eth_newBlockFilter"

ok  filterProvider did handle "eth_newBlockFilter"

ok  did not error

ok  has response

ok  has response.result

ok  filterProvider did see "eth_getFilterLogs

ok  filterProvider did handle "eth_getFilterLogs

ok  eth_getFilterLogs returned an empty result for a non log filter

ok  did not error

# subscriptions - basic block subscription

ok  did not error

ok  has response

ok  subscriptionSubprovider did see "eth_subscribe"

ok  subscriptionSubprovider did handle "eth_subscribe"

ok  did not error

ok  did not error

ok  has notification

ok  notification has correct subscription id

ok  correct result

ok  did not error

ok  did not error

# subscriptions - log subscription - basic

ok  did not error

ok  has response

ok  subscriptionSubprovider did see "eth_subscribe"

ok  subscriptionSubprovider did handle "eth_subscribe"

ok  did not error

ok  did not error

ok  has notification

ok  notification has correct subscription id

ok  correct result

ok  did not error

ok  did not error

# subscriptions - log subscription - and logic

ok  did not error

ok  has response

ok  subscriptionSubprovider did see "eth_subscribe"

ok  subscriptionSubprovider did handle "eth_subscribe"

ok  did not error

ok  did not error

ok  has notification

ok  notification has correct subscription id

ok  correct result

ok  did not error

ok  did not error

# subscriptions - log subscription - or logic

ok  did not error

ok  has response

ok  subscriptionSubprovider did see "eth_subscribe"

ok  subscriptionSubprovider did handle "eth_subscribe"

ok  did not error

ok  did not error

ok  has notification

ok  notification has correct subscription id

ok  correct result

ok  did not error

ok  did not error

ok  has notification

ok  correct result

ok  did not error

ok  did not error

# subscriptions - log subscription - wildcard logic

ok  did not error

ok  has response

ok  subscriptionSubprovider did see "eth_subscribe"

ok  subscriptionSubprovider did handle "eth_subscribe"

ok  did not error

ok  did not error

ok  has notification

ok  notification has correct subscription id

ok  correct result

ok  did not error

ok  did not error

ok  has notification

ok  correct result

ok  did not error

ok  did not error

# tx sig

ok  did not error

ok  has response

ok  providerA did see "signTransaction"

ok  providerA did handle "signTransaction"

ok  providerB did see "eth_getTransactionCount"

ok  providerB did NOT handle "eth_getTransactionCount"

ok  providerC did see "eth_getTransactionCount"

ok  providerC did handle "eth_getTransactionCount"

ok  providerB did see "eth_gasPrice"

ok  providerB did handle "eth_gasPrice"

ok  providerC did see "eth_sendRawTransaction"

ok  providerC did handle "eth_sendRawTransaction"

# no such account

ok  did error

# sign message

ok  did not error

ok  has response

ok  signed response is correct

# sign message personal_sign - kumavis fml manual test I

ok  null

ok  has response

ok  rpc result is as expected

# sign message personal_sign - kumavis fml manual test I

ok  null

ok  has response

ok  rpc result is as expected

# sign message personal_sign - kumavis fml manual test II

ok  null

ok  has response

ok  rpc result is as expected

# sign message personal_sign - kumavis fml manual test II

ok  null

ok  has response

ok  rpc result is as expected

# sign message personal_sign - kumavis fml manual test III

ok  null

ok  has response

ok  rpc result is as expected

# sign message personal_sign - kumavis fml manual test III

ok  null

ok  has response

ok  rpc result is as expected

# recover message personal_ecRecover - geth kumavis manual I recover

ok  null

ok  has response

ok  rpc result is as expected

# recover message personal_ecRecover - geth kumavis manual II recover

ok  null

ok  has response

ok  rpc result is as expected

# sign message eth_signTypedData - sign typed message

ok  null

ok  has response

ok  rpc result is as expected

# sender validation, with mixed-case

ok  correctly validated sender

# Sanitizer removes unknown keys

ok  should be falsy

ok  should be equal

ok  should be equal

ok  should be equal

ok  should be equal

ok  should be equal

ok  no error

ok  result was received correctly

# binary search eth_estimateGas implementation

ok  did not error

ok  has response

ok  properly calculates gas needed

ok  ran expected number of iterations

ok  did not error

ok  has response

ok  properly calculates gas needed

ok  ran expected number of iterations

ok  did not error

ok  has response

ok  properly calculates gas needed

ok  ran expected number of iterations

ok  did not error

..

# tests

# pass  

# ok

然后根目录下我们能够看见有一个example.js，对其进行修改：

const Ethjs = require('ethjs')

//const ProviderEngine = require('./index.js')//这里没使用到这个，因为zero.js中已经调用它，你可以自己使用这个来add自己想添加的Subprovider，设置自己的providerEngine

const ZeroClientProvider = require('./zero.js')//已经将ProviderEngine需要的Subprovider都add进去了

// create engine

const providerEngine = ZeroClientProvider({

  // supports http and websockets

  // but defaults to infura's mainnet rest api

  // rpcUrl: 'https://mainnet.infura.io',

  rpcUrl: 'http://localhost:7545',//连接本地的ganache

  // rpcUrl: 'wss://mainnet.infura.io/ws',

  // rpcUrl: 'ws://localhost:8545/ws',

})

// use the provider to instantiate Ethjs, Web3, etc

const eth = new Ethjs(providerEngine)

// log new blocks

providerEngine.on('block', function(block) {

  const blockNumber = Number.parseInt(block.number.toString('hex'), )

  const blockHash = `0x${block.hash.toString('hex')}`

  console.log(`block: #${blockNumber} ${blockHash}`)

})

然后在终端进行运行：

userdeMacBook-Pro:provider-engine-master user$ node example.js

block: # 0x9f19e5f94819dd3edba2b0ae9d08f9c7d93b507aef26ede53febf78fea06ae8d

该block是ganache上初始化生成的：

然后下面就分析下其的代码来学习这个是怎么实现的：

provider-engine/index.js

const EventEmitter = require('events').EventEmitter

const inherits = require('util').inherits

const ethUtil = require('ethereumjs-util')

const EthBlockTracker = require('eth-block-tracker') //看本博客MetaMask/eth-block-tracker

const map = require('async/map')

const eachSeries = require('async/eachSeries')

const Stoplight = require('./util/stoplight.js')

const cacheUtils = require('./util/rpc-cache-utils.js')

const createPayload = require('./util/create-payload.js')

const noop = function(){}

module.exports = Web3ProviderEngine

inherits(Web3ProviderEngine, EventEmitter)

function Web3ProviderEngine(opts) {//

  const self = this

  EventEmitter.call(self)

  self.setMaxListeners()

  // parse options

  opts = opts || {}

  // block polling

  const directProvider = { sendAsync: self._handleAsync.bind(self) } //4 设置sendAsync方法，当以运行sendAsync就会去运行self._handleAsync

  const blockTrackerProvider = opts.blockTrackerProvider || directProvider //5 设置区块跟踪器跟踪的provider

  self._blockTracker = opts.blockTracker || new EthBlockTracker({ //6 设置blockTracker，如果没有则根据provider生成

    provider: blockTrackerProvider,

    pollingInterval: opts.pollingInterval || ,

  })

  // handle new block

  self._blockTracker.on('block', (jsonBlock) => {//监听block，当生成block就会触发回调

    const bufferBlock = toBufferBlock(jsonBlock)//并将block中数据值转换成buffer格式

    self._setCurrentBlock(bufferBlock) //然后将该区块记录下来

  })

  // emit block events from the block tracker

  self._blockTracker.on('block', self.emit.bind(self, 'rawBlock'))//监听'block'事件，触发时触发EventEmitter的'rawBlock'事件

  self._blockTracker.on('sync', self.emit.bind(self, 'sync'))

  self._blockTracker.on('latest', self.emit.bind(self, 'latest'))

  // set initialization blocker

  self._ready = new Stoplight()

  // unblock initialization after first block

  self._blockTracker.once('block', () => {

    self._ready.go()

  })

  // local state

  self.currentBlock = null

  self._providers = []

}

// public

Web3ProviderEngine.prototype.start = function(cb = noop){

  const self = this

  // start block polling

  self._blockTracker.start().then(cb).catch(cb)

}

Web3ProviderEngine.prototype.stop = function(){

  const self = this

  // stop block polling

  self._blockTracker.stop()

}

Web3ProviderEngine.prototype.addProvider = function(source){

  const self = this

  self._providers.push(source)//在zero.js处会调用engine.addProvider(各类subproviders)，这些subproviders会存放在self._providers

  source.setEngine(this) //调用该self._providers的setEngine，

}

Web3ProviderEngine.prototype.send = function(payload){//说明这个Web3ProviderEngine的方法都是异步的

  throw new Error('Web3ProviderEngine does not support synchronous requests.')

}

Web3ProviderEngine.prototype.sendAsync = function(payload, cb){

  const self = this

  self._ready.await(function(){

    if (Array.isArray(payload)) {

      // handle batch

      map(payload, self._handleAsync.bind(self), cb)

    } else {

      // handle single

      self._handleAsync(payload, cb)

    }

  })

}

// private

Web3ProviderEngine.prototype._handleAsync = function(payload, finished) {//

  var self = this

  var currentProvider = -1 //就是现在并没有添加任何的subproviders

  var result = null

  var error = null

  var stack = []

  next()

  function next(after) {

    currentProvider +=

    stack.unshift(after)//unshift() 方法可向数组的开头添加一个或更多元素，并返回新的长度，stack中存储end之前要运行的操作after

    // Bubbled down as far as we could go, and the request wasn't

    // handled. Return an error.

    if (currentProvider >= self._providers.length) {//如果此时的currentProvider的值大于self._providers的长度，说明现有的subproviders不能够解决该payload

      end(new Error('Request for method "' + payload.method + '" not handled by any subprovider. Please check your subprovider configuration to ensure this method is handled.'))

    } else {

      try {

        var provider = self._providers[currentProvider]//获取对应的subproviders

        provider.handleRequest(payload, next, end)//然后运行该subproviders的handleRequest，如果调用的method不是当前的provider能够解决的，就会重新调用next()，查找下一个subproviders是否能够解决

      } catch (e) {

        end(e)

      }

    }

  }

  function end(_error, _result) {

    error = _error

    result = _result

    eachSeries(stack, function(fn, callback) {//eachSeries(arr, iterator, [callback])

      if (fn) {

        fn(error, result, callback)

      } else {

        callback()

      }

    }, function() {//将stack数组中的fn迭代运行后，就调用最后这个回调将运行结果输出

      // console.log('COMPLETED:', payload)

      // console.log('RESULT: ', result)

      var resultObj = {

        id: payload.id,

        jsonrpc: payload.jsonrpc,

        result: result

      }

      if (error != null) {

        resultObj.error = {

          message: error.stack || error.message || error,

          code: -

        }

        // respond with both error formats

        finished(error, resultObj)

      } else {

        finished(null, resultObj)

      }

    })

  }

}

//

// from remote-data

//

Web3ProviderEngine.prototype._setCurrentBlock = function(block){

  const self = this

  self.currentBlock = block

  self.emit('block', block)//触发block事件

}

// util

function toBufferBlock (jsonBlock) {//将block中数据值转换成buffer格式

  return {

    number:           ethUtil.toBuffer(jsonBlock.number),

    hash:             ethUtil.toBuffer(jsonBlock.hash),

    parentHash:       ethUtil.toBuffer(jsonBlock.parentHash),

    nonce:            ethUtil.toBuffer(jsonBlock.nonce),

    mixHash:          ethUtil.toBuffer(jsonBlock.mixHash),

    sha3Uncles:       ethUtil.toBuffer(jsonBlock.sha3Uncles),

    logsBloom:        ethUtil.toBuffer(jsonBlock.logsBloom),

    transactionsRoot: ethUtil.toBuffer(jsonBlock.transactionsRoot),

    stateRoot:        ethUtil.toBuffer(jsonBlock.stateRoot),

    receiptsRoot:     ethUtil.toBuffer(jsonBlock.receiptRoot || jsonBlock.receiptsRoot),

    miner:            ethUtil.toBuffer(jsonBlock.miner),

    difficulty:       ethUtil.toBuffer(jsonBlock.difficulty),

    totalDifficulty:  ethUtil.toBuffer(jsonBlock.totalDifficulty),

    size:             ethUtil.toBuffer(jsonBlock.size),

    extraData:        ethUtil.toBuffer(jsonBlock.extraData),

    gasLimit:         ethUtil.toBuffer(jsonBlock.gasLimit),

    gasUsed:          ethUtil.toBuffer(jsonBlock.gasUsed),

    timestamp:        ethUtil.toBuffer(jsonBlock.timestamp),

    transactions:     jsonBlock.transactions,

  }

provider-engine/zero.js

const ProviderEngine = require('./index.js')

const DefaultFixture = require('./subproviders/default-fixture.js')//设置静态文件的默认存储区域

const NonceTrackerSubprovider = require('./subproviders/nonce-tracker.js')

const CacheSubprovider = require('./subproviders/cache.js')

const FilterSubprovider = require('./subproviders/filters.js')

const SubscriptionSubprovider = require('./subproviders/subscriptions')

const InflightCacheSubprovider = require('./subproviders/inflight-cache')

const HookedWalletSubprovider = require('./subproviders/hooked-wallet.js')

const SanitizingSubprovider = require('./subproviders/sanitizer.js')

const InfuraSubprovider = require('./subproviders/infura.js')

const FetchSubprovider = require('./subproviders/fetch.js')

const WebSocketSubprovider = require('./subproviders/websocket.js')

//zero将该添加进的subproviders都添加进来了

module.exports = ZeroClientProvider

function ZeroClientProvider(opts = {}){//

  const connectionType = getConnectionType(opts)//

  const engine = new ProviderEngine(opts.engineParams)//3 engineParams是对engine的设置，如果没有就使用默认定义，设置Web3ProviderEngine

  //7 设置相应的Subprovider，将其添加到Web3ProviderEngine中

  // static

  const staticSubprovider = new DefaultFixture(opts.static)

  engine.addProvider(staticSubprovider)

  // nonce tracker

  engine.addProvider(new NonceTrackerSubprovider())

  // sanitization 卫生处理？？

  const sanitizer = new SanitizingSubprovider()

  engine.addProvider(sanitizer)

  // cache layer

  const cacheSubprovider = new CacheSubprovider()

  engine.addProvider(cacheSubprovider)

  // filters + subscriptions

  // for websockets, only polyfill filters

  if (connectionType === 'ws') {

    const filterSubprovider = new FilterSubprovider()

    engine.addProvider(filterSubprovider)

  // otherwise, polyfill both subscriptions and filters

  } else {

    const filterAndSubsSubprovider = new SubscriptionSubprovider()

    // forward subscription events through provider

    filterAndSubsSubprovider.on('data', (err, notification) => {

      engine.emit('data', err, notification)

    })

    engine.addProvider(filterAndSubsSubprovider)

  }

  // inflight cache

  const inflightCache = new InflightCacheSubprovider()

  engine.addProvider(inflightCache)

  // id mgmt

  const idmgmtSubprovider = new HookedWalletSubprovider({ //钱包，只实现了一部分的功能

    // accounts

    getAccounts: opts.getAccounts,

    // transactions

    processTransaction: opts.processTransaction,

    approveTransaction: opts.approveTransaction,

    signTransaction: opts.signTransaction,

    publishTransaction: opts.publishTransaction,

    // messages

    // old eth_sign

    processMessage: opts.processMessage,

    approveMessage: opts.approveMessage,

    signMessage: opts.signMessage,

    // new personal_sign

    processPersonalMessage: opts.processPersonalMessage,

    processTypedMessage: opts.processTypedMessage,

    approvePersonalMessage: opts.approvePersonalMessage,

    approveTypedMessage: opts.approveTypedMessage,

    signPersonalMessage: opts.signPersonalMessage,

    signTypedMessage: opts.signTypedMessage,

    personalRecoverSigner: opts.personalRecoverSigner,

  })

  engine.addProvider(idmgmtSubprovider)

  // data source

  const dataSubprovider = opts.dataSubprovider || createDataSubprovider(connectionType, opts)

  // for websockets, forward subscription events through provider

  if (connectionType === 'ws') {

    dataSubprovider.on('data', (err, notification) => {

      engine.emit('data', err, notification)

    })

  }

  engine.addProvider(dataSubprovider)

  // start polling

  if (!opts.stopped) {

    engine.start() //8 打开engine

  }

  return engine

}

function createDataSubprovider(connectionType, opts) {

  const { rpcUrl, debug } = opts

  // default to infura

  if (!connectionType) {//如果使用的不是http和ws,就使用infura进行连接

    return new InfuraSubprovider()

  }

  if (connectionType === 'http') {

    return new FetchSubprovider({ rpcUrl, debug })

  }

  if (connectionType === 'ws') {

    return new WebSocketSubprovider({ rpcUrl, debug })

  }

  throw new Error(`ProviderEngine - unrecognized connectionType "${connectionType}"`)

}

function getConnectionType({ rpcUrl }) {//2检查传给zero的参数是否正确

  if (!rpcUrl) return undefined//2如果没有传入rpcUrl，那么就返回连接失败

  const protocol = rpcUrl.split(':')[].toLowerCase() //2要将协议处小写，因为大写将不成功，如需要将HTTP换成http

  switch (protocol) {

    case 'http':

    case 'https': //2 http/https返回的type为http

      return 'http'

    case 'ws':

    case 'wss'://2 ws/wss返回的类型是ws

      return 'ws'

    default: //2 否则就传无法识别协议类型

      throw new Error(`ProviderEngine - unrecognized protocol in "${rpcUrl}"`)

  }

}

这两个是核心代码，试着使用一下

const ProviderEngine = require('web3-provider-engine')

const CacheSubprovider = require('web3-provider-engine/subproviders/cache.js')

const FixtureSubprovider = require('web3-provider-engine/subproviders/fixture.js')

const FilterSubprovider = require('web3-provider-engine/subproviders/filters.js')

const VmSubprovider = require('web3-provider-engine/subproviders/vm.js')

const HookedWalletSubprovider = require('web3-provider-engine/subproviders/hooked-wallet.js')

const NonceSubprovider = require('web3-provider-engine/subproviders/nonce-tracker.js')

const RpcSubprovider = require('web3-provider-engine/subproviders/rpc.js')

const createPayload = require('web3-provider-engine/util/create-payload.js')

const ethUtil = require('ethereumjs-util')

const Transaction = require('ethereumjs-tx')

var engine = new ProviderEngine()

// var web3 = new Web3(engine)

var privateKey = new Buffer.from('9af0f29100b9575ffe7d5596d87003b6ada89076ca84342f1fe57d85acde4ca6', 'hex')

var address = new Buffer.from('0x3455f15cc11F2E77c055f931A6C918ccc7c18fd8', 'hex')

var addressHex = '0x'+address.toString('hex')

// static results

engine.addProvider(new FixtureSubprovider({

  web3_clientVersion: 'ProviderEngine/v0.0.0/javascript',

  net_listening: true,

  eth_hashrate: '0x00',

  eth_mining: false,

  eth_syncing: true,

}))

// cache layer

engine.addProvider(new CacheSubprovider())

// filters

engine.addProvider(new FilterSubprovider())

// pending nonce

engine.addProvider(new NonceSubprovider())

// vm

engine.addProvider(new VmSubprovider())

// id mgmt

engine.addProvider(new HookedWalletSubprovider({

  getAccounts: function(cb){

    cb(null, [addressHex])

  },

  // approveTransaction: function(cb){ ... },

  signTransaction: function(txParams, cb){

    var tx = new Transaction(txParams)

    tx.sign(privateKey)

    var rawTx = '0x'+tx.serialize().toString('hex')

    cb(null, rawTx)

  },

}))

// data source

engine.addProvider(new RpcSubprovider({

  rpcUrl: 'http://localhost:7545',

  eth_gasPrice: '0x1234',

  eth_getTransactionCount: '0x00',

  eth_sendRawTransaction: function(payload, next, done){

    var rawTx = ethUtil.toBuffer(payload.params[])

    var tx = new Transaction(rawTx)

    var hash = '0x'+tx.hash().toString('hex')

    done(null, hash)

  }

}))

// log new blocks

engine.on('block', function(block){

  console.log('================================')

  console.log('BLOCK CHANGED:', '#'+block.number.toString('hex'), '0x'+block.hash.toString('hex'))

  console.log('================================')

})

// network connectivity error

engine.on('error', function(err){

  // report connectivity errors

  console.error(err.stack)

})

var txPayload1 = {

  method: 'eth_sendTransaction',

  params: [{

    from: addressHex,

    to: addressHex,

    value: '0x01',

    gas: '0x6691b7',

  }]

}

// start polling for blocks

engine.start()

engine.sendAsync(createPayload(txPayload1), function(err, response){

  if(!err){

    console.log(response)

  }else{

    console.log(err.message+err.stack)

  }

})

然后运行可得：

userdeMacBook-Pro:test-provider user$ supervisor --harmony main.js

Running node-supervisor with

  program '--harmony main.js'

  --watch '.'

  --extensions 'node,js'

  --exec 'node'

Starting child process with 'node --harmony main.js'

Watching directory '/Users/user/test-provider' for changes.

Press rs for restarting the process.

================================

BLOCK CHANGED: # 0x9f19e5f94819dd3edba2b0ae9d08f9c7d93b507aef26ede53febf78fea06ae8d

================================

{ id: ,

  jsonrpc: '2.0',

  result:

   '0xe1b85b3a4f7e02f2865d7b087698ef5428a0f9333b70fcef761e844051471737' }

================================

BLOCK CHANGED: # 0x93b6468b8a3176f15a2bf89fbe42e873f54e681e171605adf44aeb6e01582041

================================

从这里我们可以看出来，这个provider-engine的作用其实也就相当于自己定义了一个自己的web3 provider，然后就能够调用相应的函数了。

只是相应的函数的调用要自己在相应的Subprovider进行定义，不同Subprovider对应的函数是：

Current RPC method support:

static
  • web3_clientVersion
  • net_version
  • net_listening
  • net_peerCount
  • eth_protocolVersion
  • eth_hashrate
  • eth_mining
  • eth_syncing
filters
  • eth_newBlockFilter
  • eth_newPendingTransactionFilter
  • eth_newFilter
  • eth_uninstallFilter
  • eth_getFilterLogs
  • eth_getFilterChanges
accounts manager
vm
  • eth_call
  • eth_estimateGas
db source
  • db_putString
  • db_getString
  • db_putHex
  • db_getHex
compiler
  • eth_getCompilers
  • eth_compileLLL
  • eth_compileSerpent
  • eth_compileSolidity
shh gateway
  • shh_version
  • shh_post
  • shh_newIdentity
  • shh_hasIdentity
  • shh_newGroup
  • shh_addToGroup
data source ( fallback to rpc )
  • eth_gasPrice
  • eth_blockNumber
  • eth_getBalance
  • eth_getBlockByHash
  • eth_getBlockByNumber
  • eth_getBlockTransactionCountByHash
  • eth_getBlockTransactionCountByNumber
  • eth_getCode
  • eth_getStorageAt
  • eth_getTransactionByBlockHashAndIndex
  • eth_getTransactionByBlockNumberAndIndex
  • eth_getTransactionByHash
  • eth_getTransactionCount
  • eth_getTransactionReceipt
  • eth_getUncleByBlockHashAndIndex
  • eth_getUncleByBlockNumberAndIndex
  • eth_getUncleCountByBlockHash
  • eth_getUncleCountByBlockNumber
  • eth_sendRawTransaction
  • eth_getLogs ( not used in web3.js )
( not supported )
  • eth_getWork
  • eth_submitWork
  • eth_submitHashrate ( not used in web3.js )

可以看test代码了解一下这个到底怎么用：

npm run test 中有一个警告：

(node:) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.

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