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/*
* Copyright (c) 2013-2021 node-coap contributors.
*
* node-coap is licensed under an MIT +no-false-attribs license.
* All rights not explicitly granted in the MIT license are reserved.
* See the included LICENSE file for more details.
*/
var Readable = require('readable-stream').Readable
, util = require('util')
, pktToMsg = require('./helpers').packetToMessage
function ObserveReadStream(packet, rsinfo, outSocket) {
Readable.call(this, { objectMode: true })
this.rsinfo = rsinfo
this.outSocket = outSocket
this._lastId = undefined
this._lastTime = 0
this._disableFiltering = false
this.append(packet)
}
util.inherits(ObserveReadStream, Readable)
ObserveReadStream.prototype.append = function(packet) {
Iif (!this.readable)
return
pktToMsg(this, packet)
// First notification
if (this._lastId === undefined) {
this._lastId = this.headers['Observe'] - 1
}
const dseq = (this.headers['Observe'] - this._lastId) & 0xffffff
const dtime = Date.now() - this._lastTime
if (this._disableFiltering || (dseq > 0 && dseq < (1 << 23)) || dtime > 128*1000) {
this._lastId = this.headers['Observe']
this._lastTime = Date.now()
this.push(packet.payload)
}
}
ObserveReadStream.prototype.close = function(eagerDeregister) {
this.push(null)
this.emit('close')
if (eagerDeregister) {
this.emit('deregister')
}
}
// nothing to do, data will be pushed from the server
ObserveReadStream.prototype._read = function() {}
module.exports = ObserveReadStream
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