https://github.com/MetaMask/metamask-extension/tree/develop/mascara

找了很多个实例，基本上很少是不使用线上钱包的，只有metamask-extension的mascara实例中实现了，下面是将整个metamask-extension下载下来，进行配置，然后运行的步骤：

进行环境部署：

Building locally

• InstallNode.jsversion 8.11.3 and npm version 6.1.0
  • If you are usingnvm(recommended) runningnvm usewill automatically choose the right node version for you.
  • Select npm 6.1.0:npm install -g npm@6.1.0
• Install dependencies:npm install
• Install gulp globally withnpm install -g gulp-cli.
• Build the project to the./dist/folder withgulp build.
• Optionally, to rebuild on file changes, rungulp dev.
• To package .zip files for distribution, rungulp zip, or run the full build & zip withgulp dist.

Uncompressed builds can be found in/dist, compressed builds can be found in/buildsonce they're built.

运行npm install时出现错误：

Unhandled rejection Error: Command failed: /usr/bin/git checkout 4.0error: pathspec'4.0'did not match any file(s) known to git.at ChildProcess.exithandler (child_process.js:291:12)at ChildProcess.emit (events.js:182:13)at maybeClose (internal/child_process.js:961:16)at Socket.stream.socket.on (internal/child_process.js:380:11)at Socket.emit (events.js:182:13)at Pipe._handle.close (net.js:595:12)

导致这个错误的原因在package.json这个文件中的：

"gulp": "github:gulpjs/gulp#4.0",

将其改成：

"gulp": "4.0",

就好了

再运行npm install,但是后面又出错：

/Users/user/.node-gyp/10.5.0/include/node/node.h:88:20: note: expanded frommacro'NODE_DEPRECATED'__attribute__((deprecated(message))) declarator^../src/addon.cpp:59:36: error: no matching member function forcall to'NewInstance'info.GetReturnValue().Set(cons->NewInstance(argc...~~~~~~^~~~~~~~~~~
/Users/user/.node-gyp/10.5.0/include/node/v8.h:3914:44: note: candidatefunction not viable: requires single argument'context', but 2argumentswere providedV8_WARN_UNUSED_RESULT MaybeLocal<Object>NewInstance(^
/Users/user/.node-gyp/10.5.0/include/node/v8.h:3911:44: note: candidatefunction not viable: requires3 arguments, but 2were providedV8_WARN_UNUSED_RESULT MaybeLocal<Object>NewInstance(^
4 warnings and 1error generated.
make:*** [Release/obj.target/sha3/src/addon.o] Error 1gyp ERR!build error
gyp ERR! stack Error: `make` failed with exit code: 2gyp ERR! stack     at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:262:23)
gyp ERR! stack     at ChildProcess.emit (events.js:182:13)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:237:12)
gyp ERR! System Darwin 18.0.0gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"gyp ERR! cwd /Users/user/metamask-extension-8c3091aa7ad31e41e8f62bd5c0b803de45816b0e/node_modules/sha3
gyp ERR! node -v v10.5.0gyp ERR! node-gyp -v v3.8.0gyp ERR!not ok
npm WARN The package css-loader is included asboth a dev and production dependency.
npm WARN The package eslint-plugin-react is included asboth a dev and production dependency.
npm WARN The package eth-json-rpc-middleware is included asboth a dev and production dependency.
npm WARN The package eth-keyring-controller is included asboth a dev and production dependency.
npm WARN The package file-loader is included asboth a dev and production dependency.
npm WARN The package gulpis included asboth a dev and production dependency.npm ERR!code ELIFECYCLE
npm ERR! errno 1npm ERR! sha3@1.2.0 install: `node-gyp rebuild`
npm ERR! Exit status 1npm ERR!npm ERR! Failed at the sha3@1.2.0install script.
npm ERR! This is probably not a problem with npm. There islikely additional logging output above.npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/user/.npm/_logs/2018-11-05T08_52_12_631Z-debug.log

这个原因好像是node版本，我的node版本是10.5.0的问题

后面找到个靠谱的方法，就是将之前的package-lock.json删掉，后面发现删了就好了：

old lock files were preventing us from getting the newer version of sha3 that fixed node 10 support.

之后运行gulp build去生成dist文件夹时也遇见了错误：

gulp build
fs.js:119throwerr;^Error: ENOENT: no such file or directory, scandir'/Users/user/metamask-extension-8c3091aa7ad31e41e8f62bd5c0b803de45816b0e/node_modules/gulp-sass/node_modules/node-sass/vendor'

解决办法：

说是运行npm rebuild node-sass,如果没有报错，那就是成功了

然后重新运行gulp build，又遇见一个错：

[18:07:02] Did you forget to signal async completion?
/Users/user/metamask-extension-8c3091aa7ad31e41e8f62bd5c0b803de45816b0e/gulpfile.js:522throwerr^Error: Parsing file/Users/user/metamask-extension-8c3091aa7ad31e41e8f62bd5c0b803de45816b0e/node_modules/eth-sig-util/index.js: Identifier 'Buffer' has already been declared (2:8)

解决方法：

到文件处将

const { Buffer } = require('buffer');

注释掉，因为nodejs将Buffer定义为全局变量，不用require，然后再运行gulp build ,然后就成功了，然后就能够看见多了一个dist文件夹

然后就能够运行mascara了：

但是在运行npm run mascara的时候，会出错：

npm run mascara> metamask-crx@0.0.0 mascara /Users/user/metamask-extension-8c3091aa7ad31e41e8f62bd5c0b803de45816b0e> gulp dev:mascara & node ./mascara/example/serverMascara service listening on port9001Dapp listening on port9002events.js:167throw er; //Unhandled 'error' event^Error: Cannot find module'uglifyify' from '/Users/user/metamask-extension-8c3091aa7ad31e41e8f62bd5c0b803de45816b0e'

解决办法：npm install uglifyify --save

然后后面再运行npm run mascara就没问题了

但是在浏览器上运行http://localhost:9002时又出现了很多问题

1.找不到proxy.js

在mascara/proxy/index.html 中有：

<script src="./proxy.js"></script>

但是在当前目录下是没有这个文件的，这个文件其实在

mascara/src/proxy.js

解决这个问题的办法是在mascara/server/index.js中添加一行：

server.use(express.static(path.join(__dirname, '/../../src')))

并将

server.use(express.static(path.join(__dirname, '/../proxy')))

注释掉（后面发现其实可以不用注释，下面会说），然后将index.html中写成：

<script src="/proxy.js"></script>

即可

2.添加proxy.js后又出现问题：找不到/script/background.js

出现问题的地方是proxy.js的：

const background = newSwController({fileName:'./script/background.js',keepAlive:true,keepAliveInterval:30000,keepAliveDelay,
})

将其改成'/background.js'，即可

3.但是最后还是有一个问题：

Unhandled promise rejection:typeError:undefined is not an object(evaluating 'serviceWorker.postMessage')

我觉得原因是

background.on('ready', () =>{const swStream =SwStream({serviceWorker: background.controller,//这里context: 'dapp',})pageStream.pipe(swStream).pipe(pageStream) //serviceWorker.postMessage肯定是这里运行了，但是这个promise出现了问题})

好好看了一下下面这两个模块的实现，去找原因：

const SwController = require('sw-controller')//本博客MetaMask/sw-controllerconst SwStream = require('sw-stream/lib/sw-stream.js')//本博客sw-stream

然后后面看见：

sw-stream/lib/sw-stream.js（这里有serviceWorker.postMessage，那就是说明background.controller.postMessage出了问题）

const PortStream = require('./message-channel-port-stream')module.exports=SericeWorkerStreamfunction SericeWorkerStream({ serviceWorker, context }) {//create message channel for communicationconst messageChannel = newMessageChannel()//send handshake including port to respond onserviceWorker.postMessage({ action: 'handshake', context }, [messageChannel.port2])//construct stream around local message channel portconst portStream = newPortStream(messageChannel.port1)returnportStream
}

后面再查看了一下sw-controller的代码，发现它的使用情况与proxy.js上写的有所不同：

const SwController = require('sw-controller')const createSwStream = require('sw-stream')//这里proxy.js上面写的是require('sw-stream/lib/sw-stream.js')const controller = newSwController({fileName:'/service-worker.js',//optional, scope used when registering service workerscope: '/',//default: true, pings the service worker to keep it alivekeepAlive: true,
})controller.once('ready', () =>{const swStream =createSwStream({serviceWorker: controller.getWorker(),//这里proxy.js上写的是background.controller，这很有可能就是controller没能真正得到，所以不能够使用postMessage的原因})//talk to the service worker
})controller.startWorker()

因此后面将proxy.js改为：

const createParentStream = require('iframe-stream').ParentStreamconst SwController = require('sw-controller')//const SwStream = require('sw-stream/lib/sw-stream.js')
const SwStream = require('sw-stream')//改了const keepAliveDelay = Math.floor(Math.random() * (30000 - 1000)) + 1000
const background = newSwController({fileName:'/background.js',keepAlive:true,keepAliveInterval:30000,keepAliveDelay,
})const pageStream =createParentStream()
background.on('ready', () =>{const swStream =SwStream({//serviceWorker: background.controller,
serviceWorker: background.getWorker(),//改了context:'dapp',})pageStream.pipe(swStream).pipe(pageStream)})
background.on('updatefound', () =>window.location.reload())background.on('error', console.error)
background.startWorker()

然后调用npm run mascara:

userdeMacBook-Pro:metamask-extension-8c3091aa7ad31e41e8f62bd5c0b803de45816b0e user$ npm run mascara> metamask-crx@0.0.0 mascara /Users/user/metamask-extension-8c3091aa7ad31e41e8f62bd5c0b803de45816b0e> gulp dev:mascara & node ./mascara/example/serverMascara service listening on port9001Dapp listening on port9002Bundle updated! (/Users/user/metamask-extension-8c3091aa7ad31e41e8f62bd5c0b803de45816b0e/mascara/example/app.js)
[10:41:31] Using gulpfile ~/metamask-extension-8c3091aa7ad31e41e8f62bd5c0b803de45816b0e/gulpfile.js
[10:41:31] Starting 'dev:mascara'...
[10:41:31] Starting 'clean'...
[10:41:31] Finished 'clean' after 132ms
[10:41:31] Starting 'dev:scss'...
[10:41:32] Finished 'dev:scss' after 638ms
[10:41:32] Starting 'dev:mascara:js'...
[10:41:32] Starting 'dev:copy'...
[10:41:32] Starting 'dev:reload'...
[10:41:32] Starting 'dev:mascara:js:ui'...
[10:41:32] Starting 'dev:mascara:js:proxy'...
[10:41:32] Starting 'dev:mascara:js:background'...
[10:41:32] Starting 'dev:mascara:js:metamascara'...
[10:41:32] Starting 'dev:copy:locales'...
[10:41:32] Starting 'dev:copy:images'...
[10:41:32] Starting 'dev:copy:contractImages'...
[10:41:32] Starting 'dev:copy:fonts'...
[10:41:32] Starting 'dev:copy:reload'...
[10:41:32] Starting 'dev:copy:html'...
[10:41:32] Starting 'dev:copy:manifest'...
[10:41:32] Starting 'dev:copy:html:mascara'...
[10:41:32] Finished 'dev:copy:html:mascara' after 89ms
[10:41:32] Finished 'dev:copy:manifest' after 153ms
[10:41:33] Finished 'dev:copy:reload' after 796ms
[10:41:33] Finished 'dev:copy:html' after 1.06s
[10:41:45] Finished 'dev:copy:locales' after 13s
[10:41:49] Finished 'dev:copy:images' after 17s
[10:41:51] 801665 bytes written (18.85seconds)
[10:41:51] Finished 'dev:mascara:js:proxy' after 19s
[10:41:53] 1236552 bytes written (20.51seconds)
[10:41:53] Finished 'dev:mascara:js:metamascara' after 21s
[10:41:59] 10910194 bytes written (27.35seconds)
[10:42:00] Finished 'dev:mascara:js:background' after 28s
[10:42:04] Finished 'dev:copy:contractImages' after 32s
[10:42:05] Finished 'dev:copy:fonts' after 33s
[10:42:05] Starting 'manifest:chrome'...
[10:42:05] Finished 'manifest:chrome' after 40ms
[10:42:05] Starting 'manifest:opera'...
[10:42:05] Finished 'manifest:opera' after 33ms
[10:42:05] Finished 'dev:copy' after 33s
[10:42:08] 27940940 bytes written (35.72seconds)
[10:42:09] Finished 'dev:mascara:js:ui' after 37s
[10:42:09] Finished 'dev:mascara:js' after 37 s

再在浏览器运行http://localhost:9002

然后就能够惊喜地发现，错误解决了: