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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| 'use strict' | ||
| /* @flow */ | ||
|
|
||
| const EventEmitter = require('events').EventEmitter | ||
| const stream = require('readable-stream') | ||
| const debug = require('debug') | ||
|
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| /* :: import type Multiplex from './index' | ||
| export type ChannelOpts = { | ||
| chunked?: bool, | ||
| halfOpen?: bool, | ||
| lazy?: bool | ||
| } | ||
| */ | ||
|
|
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| class Channel extends stream.Duplex { | ||
| constructor (name/* : Buffer | string */, plex/* : Multiplex */, opts/* : ChannelOpts = {} */) { | ||
| const halfOpen = Boolean(opts.halfOpen) | ||
| super({ | ||
| allowHalfOpen: halfOpen | ||
| }) | ||
|
|
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| this.name = name | ||
| this.log = debug('mplex:channel:' + this.name.toString()) | ||
| this.channel = 0 | ||
| this.initiator = false | ||
| this.chunked = Boolean(opts.chunked) | ||
| this.halfOpen = halfOpen | ||
| this.destroyed = false | ||
| this.finalized = false | ||
|
|
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| this._multiplex = plex | ||
| this._dataHeader = 0 | ||
| this._opened = false | ||
| this._awaitDrain = 0 | ||
| this._lazy = Boolean(opts.lazy) | ||
|
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| let finished = false | ||
| let ended = false | ||
| this.log('open, halfOpen: ' + this.halfOpen) | ||
|
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| this.once('end', () => { | ||
| this.log('end') | ||
| this._read() // trigger drain | ||
|
|
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| if (this.destroyed) { | ||
| return | ||
| } | ||
|
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| ended = true | ||
| if (finished) { | ||
| this._finalize() | ||
| } else if (!this.halfOpen) { | ||
| this.end() | ||
| } | ||
| }) | ||
|
|
||
| this.once('finish', function onfinish () { | ||
| if (this.destroyed) { | ||
| return | ||
| } | ||
|
|
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| if (!this._opened) { | ||
| return this.once('open', onfinish) | ||
| } | ||
|
|
||
| if (this._lazy && this.initiator) { | ||
| this._open() | ||
| } | ||
|
|
||
| this._multiplex._send( | ||
| this.channel << 3 | (this.initiator ? 4 : 3), | ||
| null | ||
| ) | ||
|
|
||
| finished = true | ||
|
|
||
| if (ended) { | ||
| this._finalize() | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| destroy (err/* : Error */) { | ||
| this._destroy(err, true) | ||
| } | ||
|
|
||
| _destroy (err/* : Error */, local/* : bool */) { | ||
| this.log('_destroy:' + (local ? 'local' : 'remote')) | ||
| if (this.destroyed) { | ||
| this.log('already destroyed') | ||
| return | ||
| } | ||
|
|
||
| this.destroyed = true | ||
|
|
||
| const hasErrorListeners = EventEmitter.listenerCount(this, 'error') > 0 | ||
|
|
||
| if (err && (!local || hasErrorListeners)) { | ||
| this.emit('error', err) | ||
| } | ||
|
|
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| this.emit('close') | ||
|
|
||
| if (local && this._opened) { | ||
| if (this._lazy && this.initiator) { | ||
| this._open() | ||
| } | ||
|
|
||
| const msg = err ? new Buffer(err.message) : null | ||
| try { | ||
| this._multiplex._send( | ||
| this.channel << 3 | (this.initiator ? 6 : 5), | ||
| msg | ||
| ) | ||
| } catch (e) {} | ||
| } | ||
|
|
||
| this._finalize() | ||
| } | ||
|
|
||
| _finalize () { | ||
| if (this.finalized) { | ||
| return | ||
| } | ||
|
|
||
| this.finalized = true | ||
| this.emit('finalize') | ||
| } | ||
|
|
||
| _write (data/* : Buffer */, enc/* : string */, cb/* : () => void */) { | ||
| this.log('write: ', data.length) | ||
| if (!this._opened) { | ||
| this.once('open', () => { | ||
| this._write(data, enc, cb) | ||
| }) | ||
| return | ||
| } | ||
|
|
||
| if (this.destroyed) { | ||
| cb() | ||
| return | ||
| } | ||
|
|
||
| if (this._lazy && this.initiator) { | ||
| this._open() | ||
| } | ||
|
|
||
| const drained = this._multiplex._send( | ||
| this._dataHeader, | ||
| data | ||
| ) | ||
|
|
||
| if (drained) { | ||
| cb() | ||
| return | ||
| } | ||
|
|
||
| this._multiplex._ondrain.push(cb) | ||
| } | ||
|
|
||
| _read () { | ||
| if (this._awaitDrain) { | ||
| const drained = this._awaitDrain | ||
| this._awaitDrain = 0 | ||
| this._multiplex._onchanneldrain(drained) | ||
| } | ||
| } | ||
|
|
||
| _open () { | ||
| let buf = null | ||
| if (Buffer.isBuffer(this.name)) { | ||
| buf = this.name | ||
| } else if (this.name !== this.channel.toString()) { | ||
| buf = new Buffer(this.name) | ||
| } | ||
|
|
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| this._lazy = false | ||
| this._multiplex._send(this.channel << 3 | 0, buf) | ||
| } | ||
|
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| open (channel/* : number */, initiator/* : bool */) { | ||
| this.log('open: ' + channel) | ||
| this.channel = channel | ||
| this.initiator = initiator | ||
| this._dataHeader = channel << 3 | (initiator ? 2 : 1) | ||
| this._opened = true | ||
| if (!this._lazy && this.initiator) this._open() | ||
| this.emit('open') | ||
| } | ||
| } | ||
|
|
||
| module.exports = Channel |
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