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stream: Increase highWaterMark on large reads
If the consumer of a Readable is asking for N bytes, and N > hwm, then clearly we have set the hwm to low, and ought to increase it. Fix #4931
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// Copyright Joyent, Inc. and other Node contributors. | ||
// | ||
// Permission is hereby granted, free of charge, to any person obtaining a | ||
// copy of this software and associated documentation files (the | ||
// "Software"), to deal in the Software without restriction, including | ||
// without limitation the rights to use, copy, modify, merge, publish, | ||
// distribute, sublicense, and/or sell copies of the Software, and to permit | ||
// persons to whom the Software is furnished to do so, subject to the | ||
// following conditions: | ||
// | ||
// The above copyright notice and this permission notice shall be included | ||
// in all copies or substantial portions of the Software. | ||
// | ||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | ||
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN | ||
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, | ||
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | ||
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | ||
// USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
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var common = require('../common'); | ||
var assert = require('assert'); | ||
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// this test verifies that passing a huge number to read(size) | ||
// will push up the highWaterMark, and cause the stream to read | ||
// more data continuously, but without triggering a nextTick | ||
// warning or RangeError. | ||
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var Readable = require('stream').Readable; | ||
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// throw an error if we trigger a nextTick warning. | ||
process.throwDeprecation = true; | ||
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var stream = new Readable({ highWaterMark: 2, bufferSize: 2 }); | ||
var reads = 0; | ||
stream._read = function(size) { | ||
reads++; | ||
stream.push(new Buffer(size)); | ||
}; | ||
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var depth = 0; | ||
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function flow(stream, size, callback) { | ||
depth += 1; | ||
var chunk = stream.read(size); | ||
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if (!chunk) | ||
stream.once('readable', flow.bind(null, stream, size, callback)); | ||
else | ||
callback(chunk); | ||
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depth -= 1; | ||
console.log('flow(' + depth + '): exit'); | ||
} | ||
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flow(stream, 5000, function() { | ||
console.log('complete (' + depth + ')'); | ||
}); | ||
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process.on('exit', function(code) { | ||
assert.equal(reads, 5000); | ||
// we pushed up the high water mark | ||
assert.equal(stream._readableState.highWaterMark, 5000); | ||
assert.equal(stream._readableState.length, 5000); | ||
assert(!code); | ||
assert.equal(depth, 0); | ||
console.log('ok'); | ||
}); |