1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22'use strict'; 23require('../common'); 24const assert = require('assert'); 25 26// This test verifies that passing a huge number to read(size) 27// will push up the highWaterMark, and cause the stream to read 28// more data continuously, but without triggering a nextTick 29// warning or RangeError. 30 31const Readable = require('stream').Readable; 32 33// Throw an error if we trigger a nextTick warning. 34process.throwDeprecation = true; 35 36const stream = new Readable({ highWaterMark: 2 }); 37let reads = 0; 38let total = 5000; 39stream._read = function(size) { 40 reads++; 41 size = Math.min(size, total); 42 total -= size; 43 if (size === 0) 44 stream.push(null); 45 else 46 stream.push(Buffer.allocUnsafe(size)); 47}; 48 49let depth = 0; 50 51function flow(stream, size, callback) { 52 depth += 1; 53 const chunk = stream.read(size); 54 55 if (!chunk) 56 stream.once('readable', flow.bind(null, stream, size, callback)); 57 else 58 callback(chunk); 59 60 depth -= 1; 61 console.log(`flow(${depth}): exit`); 62} 63 64flow(stream, 5000, function() { 65 console.log(`complete (${depth})`); 66}); 67 68process.on('exit', function(code) { 69 assert.strictEqual(reads, 2); 70 // We pushed up the high water mark 71 assert.strictEqual(stream.readableHighWaterMark, 8192); 72 // Length is 0 right now, because we pulled it all out. 73 assert.strictEqual(stream.readableLength, 0); 74 assert(!code); 75 assert.strictEqual(depth, 0); 76 console.log('ok'); 77}); 78