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| author | altaf-creator <dev@altafcreator.com> | 2025-11-16 19:08:29 +0800 |
|---|---|---|
| committer | altaf-creator <dev@altafcreator.com> | 2025-11-16 19:08:29 +0800 |
| commit | 434aa8343fdcbb4d5002f934979913c099489bee (patch) | |
| tree | 55bab4ec5a6151be57797d34f61faf5ea744471b /frontend-old/node_modules/websocket-driver/lib/websocket/streams.js | |
| parent | 893c388d4e99442a36005e5971a87730623f946e (diff) | |
sdk, del
Diffstat (limited to 'frontend-old/node_modules/websocket-driver/lib/websocket/streams.js')
| -rw-r--r-- | frontend-old/node_modules/websocket-driver/lib/websocket/streams.js | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/frontend-old/node_modules/websocket-driver/lib/websocket/streams.js b/frontend-old/node_modules/websocket-driver/lib/websocket/streams.js deleted file mode 100644 index 96ab31f..0000000 --- a/frontend-old/node_modules/websocket-driver/lib/websocket/streams.js +++ /dev/null @@ -1,146 +0,0 @@ -'use strict'; - -/** - -Streams in a WebSocket connection ---------------------------------- - -We model a WebSocket as two duplex streams: one stream is for the wire protocol -over an I/O socket, and the other is for incoming/outgoing messages. - - - +----------+ +---------+ +----------+ - [1] write(chunk) -->| ~~~~~~~~ +----->| parse() +----->| ~~~~~~~~ +--> emit('data') [2] - | | +----+----+ | | - | | | | | - | IO | | [5] | Messages | - | | V | | - | | +---------+ | | - [4] emit('data') <--+ ~~~~~~~~ |<-----+ frame() |<-----+ ~~~~~~~~ |<-- write(chunk) [3] - +----------+ +---------+ +----------+ - - -Message transfer in each direction is simple: IO receives a byte stream [1] and -sends this stream for parsing. The parser will periodically emit a complete -message text on the Messages stream [2]. Similarly, when messages are written -to the Messages stream [3], they are framed using the WebSocket wire format and -emitted via IO [4]. - -There is a feedback loop via [5] since some input from [1] will be things like -ping, pong and close frames. In these cases the protocol responds by emitting -responses directly back to [4] rather than emitting messages via [2]. - -For the purposes of flow control, we consider the sources of each Readable -stream to be as follows: - -* [2] receives input from [1] -* [4] receives input from [1] and [3] - -The classes below express the relationships described above without prescribing -anything about how parse() and frame() work, other than assuming they emit -'data' events to the IO and Messages streams. They will work with any protocol -driver having these two methods. -**/ - - -var Stream = require('stream').Stream, - util = require('util'); - - -var IO = function(driver) { - this.readable = this.writable = true; - this._paused = false; - this._driver = driver; -}; -util.inherits(IO, Stream); - -// The IO pause() and resume() methods will be called when the socket we are -// piping to gets backed up and drains. Since IO output [4] comes from IO input -// [1] and Messages input [3], we need to tell both of those to return false -// from write() when this stream is paused. - -IO.prototype.pause = function() { - this._paused = true; - this._driver.messages._paused = true; -}; - -IO.prototype.resume = function() { - this._paused = false; - this.emit('drain'); - - var messages = this._driver.messages; - messages._paused = false; - messages.emit('drain'); -}; - -// When we receive input from a socket, send it to the parser and tell the -// source whether to back off. -IO.prototype.write = function(chunk) { - if (!this.writable) return false; - this._driver.parse(chunk); - return !this._paused; -}; - -// The IO end() method will be called when the socket piping into it emits -// 'close' or 'end', i.e. the socket is closed. In this situation the Messages -// stream will not emit any more data so we emit 'end'. -IO.prototype.end = function(chunk) { - if (!this.writable) return; - if (chunk !== undefined) this.write(chunk); - this.writable = false; - - var messages = this._driver.messages; - if (messages.readable) { - messages.readable = messages.writable = false; - messages.emit('end'); - } -}; - -IO.prototype.destroy = function() { - this.end(); -}; - - -var Messages = function(driver) { - this.readable = this.writable = true; - this._paused = false; - this._driver = driver; -}; -util.inherits(Messages, Stream); - -// The Messages pause() and resume() methods will be called when the app that's -// processing the messages gets backed up and drains. If we're emitting -// messages too fast we should tell the source to slow down. Message output [2] -// comes from IO input [1]. - -Messages.prototype.pause = function() { - this._driver.io._paused = true; -}; - -Messages.prototype.resume = function() { - this._driver.io._paused = false; - this._driver.io.emit('drain'); -}; - -// When we receive messages from the user, send them to the formatter and tell -// the source whether to back off. -Messages.prototype.write = function(message) { - if (!this.writable) return false; - if (typeof message === 'string') this._driver.text(message); - else this._driver.binary(message); - return !this._paused; -}; - -// The Messages end() method will be called when a stream piping into it emits -// 'end'. Many streams may be piped into the WebSocket and one of them ending -// does not mean the whole socket is done, so just process the input and move -// on leaving the socket open. -Messages.prototype.end = function(message) { - if (message !== undefined) this.write(message); -}; - -Messages.prototype.destroy = function() {}; - - -exports.IO = IO; -exports.Messages = Messages; |
