Created
April 11, 2013 19:49
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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. | |
var common = require('../common'); | |
var assert = require('assert'); | |
var stream = require('stream'); | |
var hwm = 10; | |
var r = stream.Readable({ highWaterMark: hwm }); | |
var chunks = 10; | |
var t = (chunks * 5); | |
var data = new Buffer(chunks * hwm + Math.ceil(hwm / 2)); | |
for (var i = 0; i < data.length; i++) { | |
var c = 'asdf'.charCodeAt(i % 4); | |
data[i] = c; | |
} | |
var pos = 0; | |
var pushedNull = false; | |
r._read = function(n) { | |
if (pushedNull) { | |
throw new Error('_read after null push!?'); | |
} | |
// every third chunk is fast | |
push(!(chunks % 3)); | |
function push(fast) { | |
var c = pos >= data.length ? null : data.slice(pos, pos + n); | |
console.error('push', c === null ? 'null' : c.length); | |
pushedNull = pushedNull || c === null; | |
if (fast) { | |
pos += n; | |
r.push(c); | |
} else { | |
setTimeout(function() { | |
pos += n; | |
r.push(c); | |
}); | |
} | |
} | |
}; | |
var w = stream.Writable(); | |
var written = []; | |
w._write = function(chunk, encoding, cb) { | |
written.push(chunk.toString()); | |
cb(); | |
}; | |
var ended = false; | |
r.on('end', function() { | |
ended = true; | |
w.end(); | |
}); | |
r.on('readable', function() { | |
var chunk; | |
while (null !== (chunk = r.read(10))) { | |
w.write(chunk); | |
if (chunk.length > 4) | |
r.unshift(new Buffer('1234')); | |
} | |
}); | |
w.on('finish', function() { | |
// each chunk should start with 1234, and then be asfdasdfasdf... | |
// The first got pulled out before the first unshift('1234'), so it's | |
// lacking that piece. | |
assert.equal(written[0], 'asdfasdfas'); | |
var asdf = 'd'; | |
console.error('written[0]=%s', written[0]); | |
for (var i = 1; i < written.length; i++) { | |
console.error('written[%d]=%s', i, written[i]); | |
assert.equal(written[i].slice(0, 4), '1234'); | |
for (var j = 4; j < written[i].length; j++) { | |
var c = written[i].charAt(j); | |
assert.equal(c, asdf); | |
switch (asdf) { | |
case 'a': asdf = 's'; break; | |
case 's': asdf = 'd'; break; | |
case 'd': asdf = 'f'; break; | |
case 'f': asdf = 'a'; break; | |
} | |
} | |
} | |
console.log('ok'); | |
}); |
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