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server.js
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server.js
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var qs = require('querystring')
, url = require('url')
, once = require('once')
, util = require('util')
, concat = require('concat-stream')
, split = require('binary-split')
, through = require('through')
, pump = require('pump')
, extend = require('extend')
;
function fromObject (obj, start) {
var i = start || 0
, results = []
;
Object.keys(obj).forEach(function (key) {
i += 1
results.push({seq:i, id:key, data:obj[key]})
})
return results
}
function fromArray (arr, start) {
start = start || 0
arr.forEach(function (a, i) {a.seq = i + start})
return arr
}
function SLEEPStream (opts) {
opts.limit = opts.limit || Infinity
opts.style = opts.style || 'array'
this.opts = opts
this.i = 0
var stream = through(this.change.bind(this), this.end.bind(this))
this.queue = stream.queue
this.emit = stream.emit
return stream
}
SLEEPStream.prototype.change = function (change) {
this.started = true
if (this.i > this.opts.limit) return this.end()
if (this.opts.style === 'newline') {
var ndrow = JSON.stringify(change) + (this.opts.sep || '\r\n')
this.queue(ndrow)
} else if (this.opts.style === 'array') {
if (this.i === 0) this.queue('[')
else this.queue(',')
this.queue(JSON.stringify(change))
} else if (this.opts.style === 'object') {
if (this.i === 0) this.queue('{"rows":[')
else this.queue(',')
this.queue(JSON.stringify(change))
} else if (this.opts.style === 'sse') {
this.queue('event: data\ndata: ' + JSON.stringify(change) + '\n\n')
} else {
this.emit('error', new Error('unknown feed style.'))
}
this.i += 1
}
SLEEPStream.prototype.end = function () {
if (this.ended) return
if (this.opts.style === 'newline' || this.opts.style === 'sse') {
// do nothing
} else if (this.opts.style === 'array') {
if (this.started) this.queue(']')
else this.queue('[]')
} else if (this.opts.style === 'object') {
if (this.started) this.queue(']}')
else this.queue('{"rows":[]}')
} else {
this.emit('error', new Error('unknown feed style.'))
}
this.queue(null)
this.ended = true
}
function readData (stream, cb) {
cb = once(cb)
var finished = false
stream.pipe(split()).pipe(through(write))
function write(buf) {
if (finished) return
var ret
try { ret = JSON.parse(buf) }
catch(e) { cb(e) }
if (ret) {
finished = true
cb(null, ret)
}
}
}
function SLEEP (getSequences, options) {
this.getSequences = getSequences
this.options = options || {}
}
SLEEP.prototype.httpHandler = function (req, resp) {
var self = this
if (req.method === 'GET') {
var opts = qs.parse(url.parse(req.url).query)
_httpHandler(opts)
} if (req.method === 'POST') {
readData(req, function (e, opts) {
if (e) return resp.writeHead(500, 'socket error')
_httpHandler(opts)
})
}
function _httpHandler (opts) {
resp.statusCode = 200
if (opts.style === 'sse') resp.setHeader('content-type', 'text/event-stream')
else resp.setHeader('content-type', 'application/json')
self.handler(opts, resp)
}
}
SLEEP.prototype.netHandler = function (socket) {
var self = this
readData(socket, function (e, opts) {
if (e) return socket.close()
self.handler(opts, socket)
})
}
SLEEP.prototype.handler = function (opts, stream) {
var self = this
var sl = new SLEEPStream(extend({}, this.options, opts))
pump(self.getSequences(opts), sl, stream)
}
exports.SLEEP = SLEEP
exports.SLEEPStream = SLEEPStream
exports.fromObject = fromObject
exports.fromArray = fromArray