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server.ts
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server.ts
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const zlib = require('zlib')
, fs = require('fs')
, qs = require('querystring')
, stream = require('stream')
, Buffer = require('buffer').Buffer
, etag = require('etag')
, path = require('path')
import obs from './observable'
import {Observable} from './observable'
const log = (...a) => console.log(...a)
// cookie middleware
export const cookie = context => {
const c = (key=undefined, val=undefined) => {
let {headers={}} = context.req
, {cookie=''} = headers
, ck = cookie
.split(';')
.map(c => c.trim())
.filter(c => c.length !== 0)
.reduce((acc, c) => {
let [key,val] = c.split('=').map(c => c.trim())
acc[key] = val
return acc
}, {})
if(key !== undefined) {
if(val === undefined) delete ck[key]
else ck[key] = val
context.res.setHeader('Set-Cookie', Object.keys(ck).map(k => `${k}=${ck[k]}`))
}
return ck
}
, clearCookie = () => context.res.setHeader('Set-Cookie', '')
context.cookie = c
context.clearCookie = clearCookie
return context
}
// send gzipped file
export const sendFile = context => {
const s = file => {
const {req, res} = context
res.statusCode = 200
addMIME(file, res) // try to auto-set a content-type if sending by URL
context.__handled = true
const e = (req.headers['accept-encoding'] || '')
const buf = file instanceof Buffer ? streamable(file) : fs.createReadStream(file)
if(e.match(/gzip/)) {
res.setHeader('content-encoding', 'gzip')
buf.pipe(zlib.createGzip()).pipe(res)
} else if(e.match(/deflate/)) {
res.setHeader('content-encoding', 'deflate')
buf.pipe(zlib.createDeflate()).pipe(res)
} else {
buf.pipe(res)
}
return context
}
context.sendFile = s
return context
}
// benchmark handler
export const benchmark = ctx => {
let before = +new Date
ctx.res.on('finish', () => {
let after = +new Date
console.log(ctx.req.url + ' --- ' + (after-before)+'ms')
})
return ctx
}
// parse data streams from req body
export const body = ctx => {
ctx.body = () =>
new Promise((res,rej) => {
let {req} = ctx
let buf = ''
req.setEncoding('utf8')
req.on('data', c => buf += c)
req.on('end', _ => {
ctx.body = () => Promise.resolve(buf)
res(buf)
})
})
return ctx
}
const streamable = buf => {
let i = 0
, x = new stream.Readable({
read(size) {
if(i < Buffer.byteLength(buf)) {
this.push(buf.slice(i,i+size))
i = i+size
} else {
this.push(null)
}
}
})
return x
}
// send gzipped response middleware
export const send = context => {
const { req, res } = context
, ifNoneMatch = req.headers['if-none-match']
, e = req.headers['accept-encoding'] || ''
, s = (buffer, code=200) => {
context.__handled = true
if(typeof buffer === 'number') {
res.statusCode = buffer
return res.end()
} else {
res.statusCode = code
}
if([null, undefined].indexOf(buffer) != -1) return res.end()
if(!(buffer instanceof Buffer))
buffer = Buffer.from(typeof buffer === 'object' ? JSON.stringify(buffer) : buffer)
let etag_buf = etag(buffer)
if(etag_buf && ifNoneMatch && etag_buf === ifNoneMatch){
res.statusCode = 304 // not modified
return res.end('')
}
res.setHeader('ETag', etag_buf)
buffer = streamable(buffer)
if(e.match(/gzip/)) {
res.setHeader('content-encoding', 'gzip')
buffer.pipe(zlib.createGzip()).pipe(res)
} else if(e.match(/deflate/)) {
res.setHeader('content-encoding', 'deflate')
buffer.pipe(zlib.createDeflate()).pipe(res)
} else {
buffer.pipe(res)
}
return context
}
context.send = s
return context
}
// routing middleware
export const route = type => (url, action) => context => {
if(context.__handled || context.req.method.toLowerCase() !== type.toLowerCase()) return context
const {req, res} = context
, reggie = url.replace(/\/\{((\w*)(\??))\}/ig, '\/?([^\\/]+$3)')
, r = RegExp(`^${reggie}$`)
, i = req.url.indexOf('?')
, v = r.exec(i === -1 ? req.url : req.url.slice(0,i))
if(!!v) {
context.__handled = true
const params = v.slice(1)
, query = qs.parse(req.url.slice(i+1))
context.params = params
context.query = query
action(context)
}
return context
}
export const get = route('get')
export const put = route('put')
export const post = route('post')
export const del = route('delete')
export const patch = route('patch')
export const option = route('option')
export const contextRouting = ctx => {
ctx.route = t => (...args) => route(t)(...args)(ctx)
'get,put,post,delete,patch,option'.split(',').map(k => ctx[k] = ctx.route(k))
return ctx
}
// static file serving async-middleware
export const serve = (folder='./', route='/', cache=true, age = 2628000) => context => {
if(context.__handled) return Promise.resolve(context)
const {req, res} = context
, ifNoneMatch = req.headers['if-none-match']
, {url: __url} = req
, q = __url.indexOf('?')
, hash = __url.indexOf('#')
, _url = __url.slice(0, q !== -1 ? q : (hash !== -1 ? hash : undefined))
, url =
_url
.slice(1) // remove prefixed /
.replace(new RegExp(`/^${route}/`,`ig`), '') // remove base-route
, filepath = `${process.cwd()}/${folder}/${url}`.replace(/\/\//ig, '/') // unescape slashes
, e = req.headers['accept-encoding'] || ''
const getFile = (filepath) =>
new Promise((res, rej) =>
fs.stat(filepath, (err, stats) =>
err ? res(context) : rej(stats) ))
.catch(stats => {
if(stats.isDirectory()){
// try /index.html
return getFile(path.join(filepath, 'index.html'))
} else if(stats.isFile()){
context.__handled = true
let etag_buf = etag(stats)
if(etag_buf && ifNoneMatch && etag_buf === ifNoneMatch){
res.statusCode = 304 // not modified
res.end('')
return Promise.reject(context)
}
res.setHeader('ETag', etag_buf)
addMIME(filepath, res)
if(!cache){
res.setHeader('cache-control', 'no-cache, no-store, must-revalidate')
res.setHeader('Pragma', 'no-cache')
res.setHeader('Expires', '-1')
} else {
res.setHeader('cache-control', `public, max-age=${age}`)
res.setHeader('Pragma', 'cache')
res.setHeader('Expires', new Date(+new Date + age*1000).toUTCString())
}
if(e.match(/gzip/)) {
res.setHeader('content-encoding', 'gzip')
fs.createReadStream(filepath).pipe(zlib.createGzip()).pipe(res)
} else if(e.match(/deflate/)) {
res.setHeader('content-encoding', 'deflate')
fs.createReadStream(filepath).pipe(zlib.createDeflate()).pipe(res)
} else {
fs.createReadStream(filepath).pipe(res)
}
return Promise.reject(context)
// return context // dont continue down the server pipeline
}
return context // continue down the server pipeline
})
return getFile(filepath)
}
export const contextServing = ctx => {
ctx.serve = serve
return ctx
}
const addMIME = (url, res) => {
if(typeof url !== 'string') return
const c = 'Content-Type'
url.match(/\.js$/) && res.setHeader(c, 'text/javascript')
url.match(/\.json$/) && res.setHeader(c, 'application/json')
url.match(/\.pdf$/) && res.setHeader(c, 'application/pdf')
url.match(/\.html$/) && res.setHeader(c, 'text/html')
url.match(/\.css$/) && res.setHeader(c, 'text/css')
url.match(/\.jpe?g$/) && res.setHeader(c, 'image/jpeg')
url.match(/\.png$/) && res.setHeader(c, 'image/png')
url.match(/\.gif$/) && res.setHeader(c, 'image/gif')
url.match(/\.svg$/) && res.setHeader(c, 'image/svg+xml')
}
export const server = (port=3000, timeout=5000, keepAlive=timeout, useCluster=true) => {
const http = require('http')
, cluster = require('cluster')
, domain = require('domain')
, numCPUs = require('os').cpus().length
const pipe = defaultPipe()
, root = pipe.root()
, boot = () => {
const s = http.createServer((req, res) => root({req, res}))
s.listen(port, (err) => err && console.error(err) || console.log(`Server running at :${port} on process ${process.pid}`))
s.timeout = timeout
s.keepAliveTimeout = keepAlive
}
if (cluster.isMaster && useCluster) {
for (var i = 0; i < numCPUs; i++) cluster.fork()
const onClose = worker => {
console.error('Worker closing. Restarting...')
cluster.fork()
}
cluster.on('disconnect', onClose)
// cluster.on('exit', onClose)
} else {
boot()
}
return pipe
}
export default server
export const setHeader = ctx => {
ctx.setHeader = (key, val) => ctx.res.setHeader(key, val)
return ctx
}
export const defaultPipe = $ =>
obs()
.map(
cookie,
send,
setHeader,
sendFile,
benchmark,
body,
contextRouting,
contextServing
)