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'); 25const net = require('net'); 26const debuglog = require('util').debuglog('test'); 27 28let chars_recved = 0; 29let npauses = 0; 30let totalLength = 0; 31 32const server = net.createServer((connection) => { 33 const body = 'C'.repeat(1024); 34 let n = 1; 35 debuglog('starting write loop'); 36 while (connection.write(body)) { 37 n++; 38 } 39 debuglog('ended write loop'); 40 // Now that we're throttled, do some more writes to make sure the data isn't 41 // lost. 42 connection.write(body); 43 connection.write(body); 44 n += 2; 45 totalLength = n * body.length; 46 assert.ok(connection.bufferSize >= 0, `bufferSize: ${connection.bufferSize}`); 47 assert.ok( 48 connection.writableLength <= totalLength, 49 `writableLength: ${connection.writableLength}, totalLength: ${totalLength}` 50 ); 51 connection.end(); 52}); 53 54server.listen(0, () => { 55 const port = server.address().port; 56 debuglog(`server started on port ${port}`); 57 let paused = false; 58 const client = net.createConnection(port); 59 client.setEncoding('ascii'); 60 client.on('data', (d) => { 61 chars_recved += d.length; 62 debuglog(`got ${chars_recved}`); 63 if (!paused) { 64 client.pause(); 65 npauses += 1; 66 paused = true; 67 debuglog('pause'); 68 const x = chars_recved; 69 setTimeout(() => { 70 assert.strictEqual(chars_recved, x); 71 client.resume(); 72 debuglog('resume'); 73 paused = false; 74 }, 100); 75 } 76 }); 77 78 client.on('end', () => { 79 server.close(); 80 client.end(); 81 }); 82}); 83 84 85process.on('exit', () => { 86 assert.strictEqual(chars_recved, totalLength); 87 assert.strictEqual(npauses > 2, true); 88}); 89