静态服务器
使用node搭建一个可在任何目录下通过命令启动的一个简单http静态服务器
安装：npm install yg-server -g
启动：yg-server
可通过以上命令安装，启动，来看一下最终的效果
TODO
初始化
初始化静态服务器
const http = require('http'); // http模块const url = require('url'); // 解析路径const path = require('path'); // path模块const fs = require('fs'); // 文件处理模块const mime = require('mime'); // 解析文件类型const crypto = require('crypto'); // 加密模块const zlib = require('zlib'); // 压缩const openbrowser = require('open'); //自动启动浏览器 const handlebars = require('handlebars'); // 模版const templates = require('./templates'); // 用来渲染的模版文件class StaticServer { constructor(options) { this.host = options.host; this.port = options.port; this.rootPath = process.cwd(); this.cors = options.cors; this.openbrowser = options.openbrowser; }}处理错误响应
在写具体业务前，先封装几个处理响应的函数，分别是错误的响应处理，没有找到资源的响应处理，在后面会调用这么几个函数来做响应
responseError(req, res, err) { res.writeHead(500); res.end(`there is something wrong in th server! please try later!`); } responseNotFound(req, res) { // 这里是用handlerbar处理了一个模版并返回，这个模版只是单纯的一个写着404html const html = handlebars.compile(templates.notFound)(); res.writeHead(404, { 'Content-Type': 'text/html' }); res.end(html); }处理缓存
在前面的一篇文章里我介绍过node处理缓存的几种方式，这里为了方便我只使用的协商缓存，通过ETag来做验证
cacheHandler(req, res, filepath) { return new Promise((resolve, reject) => { const readStream = fs.createReadStream(filepath); const md5 = crypto.createHash('md5'); const ifNoneMatch = req.headers['if-none-match']; readStream.on('data', data => { md5.update(data); }); readStream.on('end', () => { let etag = md5.digest('hex'); if (ifNoneMatch === etag) { resolve(true); } resolve(etag); }); readStream.on('error', err => { reject(err); }); }); }处理压缩
compressHandler(req, res) { const acceptEncoding = req.headers['accept-encoding']; if (//bgzip/b/.test(acceptEncoding)) { res.setHeader('Content-Encoding', 'gzip'); return zlib.createGzip(); } else if (//bdeflate/b/.test(acceptEncoding)) { res.setHeader('Content-Encoding', 'deflate'); return zlib.createDeflate(); } else { return false; } }启动静态服务器
start() { const server = http.createSercer((req, res) => this.requestHandler(req, res)); server.listen(this.port, () => { if (this.openbrowser) { openbrowser(`http://${this.host}:${this.port}`); } console.log(`server started in http://${this.host}:${this.port}`); }); }请求处理
requestHandler(req, res) { // 通过url模块解析请求路径，获取请求文件 const { pathname } = url.parse(req.url); // 获取请求的文件路径 const filepath = path.join(this.rootPath, pathname); // 判断文件是否存在 fs.stat(filepath, (err, stat) => { if (!err) { if (stat.isDirectory()) { this.responseDirectory(req, res, filepath, pathname); } else { this.responseFile(req, res, filepath, stat); } } else { this.responseNotFound(req, res); } }); }处理请求的文件
responseFile(req, res, filepath, stat) { this.cacheHandler(req, res, filepath).then( data => { if (data === true) { res.writeHead(304); res.end(); } else { res.setHeader('Content-Type', mime.getType(filepath) + ';charset=utf-8'); res.setHeader('Etag', data); this.cors && res.setHeader('Access-Control-Allow-Origin', '*'); const compress = this.compressHandler(req, res); if (compress) { fs.createReadStream(filepath) .pipe(compress) .pipe(res); } else { fs.createReadStream(filepath).pipe(res); } } }, error => { this.responseError(req, res, error); } ); }处理请求的文件夹
responseDirectory(req, res, filepath, pathname) { fs.readdir(filepath, (err, files) => { if (!err) { const fileList = files.map(file => { const isDirectory = fs.statSync(filepath + '/' + file).isDirectory(); return { filename: file, url: path.join(pathname, file), isDirectory }; }); const html = handlebars.compile(templates.fileList)({ title: pathname, fileList }); res.setHeader('Content-Type', 'text/html'); res.end(html); } });app.js完整代码
const http = require('http');const url = require('url');const path = require('path');const fs = require('fs');const mime = require('mime');const crypto = require('crypto');const zlib = require('zlib');const openbrowser = require('open');const handlebars = require('handlebars');const templates = require('./templates');class StaticServer { constructor(options) { this.host = options.host; this.port = options.port; this.rootPath = process.cwd(); this.cors = options.cors; this.openbrowser = options.openbrowser; } /** * handler request * @param {*} req * @param {*} res */ requestHandler(req, res) { const { pathname } = url.parse(req.url); const filepath = path.join(this.rootPath, pathname); // To check if a file exists fs.stat(filepath, (err, stat) => { if (!err) { if (stat.isDirectory()) { this.responseDirectory(req, res, filepath, pathname); } else { this.responseFile(req, res, filepath, stat); } } else { this.responseNotFound(req, res); } }); } /** * Reads the contents of a directory , response files list to client * @param {*} req * @param {*} res * @param {*} filepath */ responseDirectory(req, res, filepath, pathname) { fs.readdir(filepath, (err, files) => { if (!err) { const fileList = files.map(file => { const isDirectory = fs.statSync(filepath + '/' + file).isDirectory(); return { filename: file, url: path.join(pathname, file), isDirectory }; }); const html = handlebars.compile(templates.fileList)({ title: pathname, fileList }); res.setHeader('Content-Type', 'text/html'); res.end(html); } }); } /** * response resource * @param {*} req * @param {*} res * @param {*} filepath */ async responseFile(req, res, filepath, stat) { this.cacheHandler(req, res, filepath).then( data => { if (data === true) { res.writeHead(304); res.end(); } else { res.setHeader('Content-Type', mime.getType(filepath) + ';charset=utf-8'); res.setHeader('Etag', data); this.cors && res.setHeader('Access-Control-Allow-Origin', '*'); const compress = this.compressHandler(req, res); if (compress) { fs.createReadStream(filepath) .pipe(compress) .pipe(res); } else { fs.createReadStream(filepath).pipe(res); } } }, error => { this.responseError(req, res, error); } ); } /** * not found request file * @param {*} req * @param {*} res */ responseNotFound(req, res) { const html = handlebars.compile(templates.notFound)(); res.writeHead(404, { 'Content-Type': 'text/html' }); res.end(html); } /** * server error * @param {*} req * @param {*} res * @param {*} err */ responseError(req, res, err) { res.writeHead(500); res.end(`there is something wrong in th server! please try later!`); } /** * To check if a file have cache * @param {*} req * @param {*} res * @param {*} filepath */ cacheHandler(req, res, filepath) { return new Promise((resolve, reject) => { const readStream = fs.createReadStream(filepath); const md5 = crypto.createHash('md5'); const ifNoneMatch = req.headers['if-none-match']; readStream.on('data', data => { md5.update(data); }); readStream.on('end', () => { let etag = md5.digest('hex'); if (ifNoneMatch === etag) { resolve(true); } resolve(etag); }); readStream.on('error', err => { reject(err); }); }); } /** * compress file * @param {*} req * @param {*} res */ compressHandler(req, res) { const acceptEncoding = req.headers['accept-encoding']; if (//bgzip/b/.test(acceptEncoding)) { res.setHeader('Content-Encoding', 'gzip'); return zlib.createGzip(); } else if (//bdeflate/b/.test(acceptEncoding)) { res.setHeader('Content-Encoding', 'deflate'); return zlib.createDeflate(); } else { return false; } } /** * server start */ start() { const server = http.createServer((req, res) => this.requestHandler(req, res)); server.listen(this.port, () => { if (this.openbrowser) { openbrowser(`http://${this.host}:${this.port}`); } console.log(`server started in http://${this.host}:${this.port}`); }); }}module.exports = StaticServer;创建命令行工具
module.exports = { host: 'localhost', port: 3000, cors: true, openbrowser: true, index: 'index.html', charset: 'utf8'};#! /usr/bin/env nodeconst yargs = require('yargs');const path = require('path');const config = require('./config');const StaticServer = require('../src/app');const pkg = require(path.join(__dirname, '..', 'package.json'));const options = yargs .version(pkg.name + '@' + pkg.version) .usage('yg-server [options]') .option('p', { alias: 'port', describe: '设置服务器端口号', type: 'number', default: config.port }) .option('o', { alias: 'openbrowser', describe: '是否打开浏览器', type: 'boolean', default: config.openbrowser }) .option('n', { alias: 'host', describe: '设置主机名', type: 'string', default: config.host }) .option('c', { alias: 'cors', describe: '是否允许跨域', type: 'string', default: config.cors }) .option('v', { alias: 'version', type: 'string' }) .example('yg-server -p 8000 -o localhost', '在根目录开启监听8000端口的静态服务器') .help('h').argv;const server = new StaticServer(options);server.start();入口文件
最后回到根目录下的index.js，将我们的模块导出，这样可以在根目录下通过node index来调试
module.exports = require('./bin/static-server');配置命令
配置命令非常简单，进入到package.json文件里
加入一句话
"bin": { "yg-server": "bin/static-server.js" },总结
写到这里基本上就写完了，另外还有几个模版文件，是用来在客户端展示的，可以看我的github，我就不贴了，只是一些html而已，你也可以自己设置，这个博客写多了是在是太卡了，字都打不动了。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。
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