node-http2

<!doctype html> <html lang="en"> <head> <title>Code coverage report for lib/protocol/stream.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../../prettify.css" /> <link rel="stylesheet" href="../../base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(../../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="../../index.html">all files</a> / <a href="index.html">lib/protocol/</a> stream.js </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 87.01% Statements 201/231 </div> <div class='fl pad1y space-right2'> 82.42% Branches 150/182 </div> <div class='fl pad1y space-right2'> 86.96% Functions 20/23 </div> <div class='fl pad1y space-right2'> 87.44% Lines 195/223 </div> </div> </div> <div class='status-line high'></div> <pre><table class="coverage"> <tr><td class="line-count quiet">1 2 3 4 5 6 7 8 9 10 11 12 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383×                                             22×             11×   22×           1117× 270× 270×                 1117×       13× 13× 13×       1117× 543× 543× 281×   262×   574× 400×       1117× 38×                 38× 17× 17×               21× 21× 14×   7× 7×                 1×   1× 1× 6× 2× 2×   6×    </td><td class="text"><pre class="prettyprint lang-js">var assert = require('assert');   // The Stream class // ================   // Stream is a [Duplex stream](https://nodejs.org/api/stream.html#stream_class_stream_duplex) // subclass that implements the [HTTP/2 Stream](https://tools.ietf.org/html/rfc7540#section-5) // concept. It has two 'sides': one that is used by the user to send/receive data (the `stream` // object itself) and one that is used by a Connection to read/write frames to/from the other peer // (`stream.upstream`).   var Duplex = require('stream').Duplex;   exports.Stream = Stream;   // Public API // ----------   // * **new Stream(log, connection)**: create a new Stream // // * **Event: 'headers' (headers)**: signals incoming headers // // * **Event: 'promise' (stream, headers)**: signals an incoming push promise // // * **Event: 'priority' (priority)**: signals a priority change. `priority` is a number between 0 // (highest priority) and 2^31-1 (lowest priority). Default value is 2^30. // // * **Event: 'error' (type)**: signals an error // // * **headers(headers)**: send headers // // * **promise(headers): Stream**: promise a stream // // * **priority(priority)**: set the priority of the stream. Priority can be changed by the peer // too, but once it is set locally, it can not be changed remotely. // // * **reset(error)**: reset the stream with an error code // // * **upstream**: a [Flow](flow.js) that is used by the parent connection to write/read frames // that are to be sent/arrived to/from the peer and are related to this stream. // // Headers are always in the [regular node.js header format][1]. // [1]: https://nodejs.org/api/http.html#http_message_headers   // Constructor // -----------   // The main aspects of managing the stream are: function Stream(log, connection) { Duplex.call(this);   // * logging this._log = log.child({ component: 'stream', s: this });   // * receiving and sending stream management commands this._initializeManagement();   // * sending and receiving frames to/from the upstream connection this._initializeDataFlow();   // * maintaining the state of the stream (idle, open, closed, etc.) and error detection this._initializeState();   this.connection = connection; }   Stream.prototype = Object.create(Duplex.prototype, { constructor: { value: Stream } });   // Managing the stream // -------------------   // the default stream priority is 2^30 var DEFAULT_PRIORITY = Math.pow(2, 30); var MAX_PRIORITY = Math.pow(2, 31) - 1;   // PUSH_PROMISE and HEADERS are forwarded to the user through events. Stream.prototype._initializeManagement = function _initializeManagement() { this._resetSent = false; this._priority = DEFAULT_PRIORITY; this._letPeerPrioritize = true; };   Stream.prototype.promise = function promise(headers) { var stream = new Stream(this._log, this.connection); stream._priority = Math.min(this._priority + 1, MAX_PRIORITY); this._pushUpstream({ type: 'PUSH_PROMISE', flags: {}, stream: this.id, promised_stream: stream, headers: headers }); return stream; };   Stream.prototype._onPromise = function _onPromise(frame) { this.emit('promise', frame.promised_stream, frame.headers); };   Stream.prototype.headers = function headers(headers) { this._pushUpstream({ type: 'HEADERS', flags: {}, stream: this.id, headers: headers }); };   Stream.prototype._onHeaders = function _onHeaders(frame) { Iif (frame.priority !== undefined) { this.priority(frame.priority, true); } this.emit('headers', frame.headers); };   Stream.prototype.priority = function priority(priority, peer) { if ((peer && this._letPeerPrioritize) || !peer) { if (!peer) { this._letPeerPrioritize = false;   var lastFrame = this.upstream.getLastQueuedFrame(); if (lastFrame && ((lastFrame.type === 'HEADERS') || (lastFrame.type === 'PRIORITY'))) { lastFrame.priority = priority; } else { this._pushUpstream({ type: 'PRIORITY', flags: {}, stream: this.id, priority: priority }); } }   this._log.debug({ priority: priority }, 'Changing priority'); this.emit('priority', priority); this._priority = priority; } };   Stream.prototype._onPriority = function _onPriority(frame) { this.priority(frame.priority, true); };   // Resetting the stream. Normally, an endpoint SHOULD NOT send more than one RST_STREAM frame for // any stream. Stream.prototype.reset = function reset(error) { if (!this._resetSent) { this._resetSent = true; this._pushUpstream({ type: 'RST_STREAM', flags: {}, stream: this.id, error: error }); } };   // Specify an alternate service for the origin of this stream Stream.prototype.altsvc = function altsvc(host, port, protocolID, maxAge, origin) { var stream; if (origin) { stream = 0; } else { stream = this.id; } this._pushUpstream({ type: 'ALTSVC', flags: {}, stream: stream, host: host, port: port, protocolID: protocolID, origin: origin, maxAge: maxAge }); };   // Data flow // ---------   // The incoming and the generated outgoing frames are received/transmitted on the `this.upstream` // [Flow](flow.html). The [Connection](connection.html) object instantiating the stream will read // and write frames to/from it. The stream itself is a regular [Duplex stream][1], and is used by // the user to write or read the body of the request. // [1]: https://nodejs.org/api/stream.html#stream_class_stream_duplex   // upstream side stream user side // // +------------------------------------+ // | | // +------------------+ | // | upstream | | // | | | // +--+ | +--| // read() | | _send() | _write() | | write(buf) // <--------------|B |<--------------|--------------| B|<------------ // | | | | | // frames +--+ | +--| buffers // | | | | | // -------------->|B |---------------|------------->| B|------------> // write(frame) | | _receive() | _read() | | read() // +--+ | +--| // | | | // | | | // +------------------+ | // | | // +------------------------------------+ // // B: input or output buffer   var Flow = require('./flow').Flow;   Stream.prototype._initializeDataFlow = function _initializeDataFlow() { this.id = undefined;   this._ended = false;   this.upstream = new Flow(); this.upstream._log = this._log; this.upstream._send = this._send.bind(this); this.upstream._receive = this._receive.bind(this); this.upstream.write = this._writeUpstream.bind(this); this.upstream.on('error', this.emit.bind(this, 'error'));   this.on('finish', this._finishing); };   Stream.prototype._pushUpstream = function _pushUpstream(frame) { this.upstream.push(frame); this._transition(true, frame); };   // Overriding the upstream's `write` allows us to act immediately instead of waiting for the input // queue to empty. This is important in case of control frames. Stream.prototype._writeUpstream = function _writeUpstream(frame) { this._log.debug({ frame: frame }, 'Receiving frame');   var moreNeeded = Flow.prototype.write.call(this.upstream, frame);   // * Transition to a new state if that's the effect of receiving the frame this._transition(false, frame);   // * If it's a control frame. Call the appropriate handler method. if (frame.type === 'HEADERS') { Iif (this._processedHeaders && !frame.flags['END_STREAM']) { this.emit('error', 'PROTOCOL_ERROR'); } this._processedHeaders = true; this._onHeaders(frame); } else if (frame.type === 'PUSH_PROMISE') { this._onPromise(frame); } else Iif (frame.type === 'PRIORITY') { this._onPriority(frame); } else Iif (frame.type === 'ALTSVC') { // TODO } else Iif (frame.type === 'BLOCKED') { // TODO }   // * If it's an invalid stream level frame, emit error else Iif ((frame.type !== 'DATA') && (frame.type !== 'WINDOW_UPDATE') && (frame.type !== 'RST_STREAM')) { this._log.error({ frame: frame }, 'Invalid stream level frame'); this.emit('error', 'PROTOCOL_ERROR'); }   return moreNeeded; };   // The `_receive` method (= `upstream._receive`) gets called when there's an incoming frame. Stream.prototype._receive = function _receive(frame, ready) { // * If it's a DATA frame, then push the payload into the output buffer on the other side. // Call ready when the other side is ready to receive more. if (!this._ended && (frame.type === 'DATA')) { var moreNeeded = this.push(frame.data); Iif (!moreNeeded) { this._receiveMore = ready; } }   // * Any frame may signal the end of the stream with the END_STREAM flag if (!this._ended && (frame.flags.END_STREAM || (frame.type === 'RST_STREAM'))) { this.push(null); this._ended = true; }   // * Postpone calling `ready` if `push()` returned a falsy value Eif (this._receiveMore !== ready) { ready(); } };   // The `_read` method is called when the user side is ready to receive more data. If there's a // pending write on the upstream, then call its pending ready callback to receive more frames. Stream.prototype._read = function _read() { Iif (this._receiveMore) { var receiveMore = this._receiveMore; delete this._receiveMore; receiveMore(); } };   // The `write` method gets called when there's a write request from the user. Stream.prototype._write =