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73 lines
2.6 KiB
73 lines
2.6 KiB
// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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'use strict';
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require('../common');
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const assert = require('assert');
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const util = require('util');
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const stream = require('stream');
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let passed = false;
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function PassThrough() {
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stream.Transform.call(this);
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}
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util.inherits(PassThrough, stream.Transform);
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PassThrough.prototype._transform = function(chunk, encoding, done) {
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this.push(chunk);
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done();
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};
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function TestStream() {
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stream.Transform.call(this);
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}
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util.inherits(TestStream, stream.Transform);
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TestStream.prototype._transform = function(chunk, encoding, done) {
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if (!passed) {
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// Char 'a' only exists in the last write
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passed = chunk.toString().indexOf('a') >= 0;
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}
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done();
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};
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const s1 = new PassThrough();
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const s2 = new PassThrough();
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const s3 = new TestStream();
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s1.pipe(s3);
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// Don't let s2 auto close which may close s3
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s2.pipe(s3, {end: false});
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// We must write a buffer larger than highWaterMark
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const big = Buffer.alloc(s1._writableState.highWaterMark + 1, 'x');
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// Since big is larger than highWaterMark, it will be buffered internally.
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assert(!s1.write(big));
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// 'tiny' is small enough to pass through internal buffer.
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assert(s2.write('tiny'));
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// Write some small data in next IO loop, which will never be written to s3
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// Because 'drain' event is not emitted from s1 and s1 is still paused
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setImmediate(s1.write.bind(s1), 'later');
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// Assert after two IO loops when all operations have been done.
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process.on('exit', function() {
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assert(passed, 'Large buffer is not handled properly by Writable Stream');
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});
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