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stream: add bytesRead property for readable
Add a bytesRead property for readable is useful in some use cases. When user want know how many bytes read of readable, need to caculate it in userland. If encoding is specificed, get the value is very slowly. PR-URL: nodejs#4372 Reviewed-By: Trevor Norris <trev.norris@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,119 @@ | ||
'use strict'; | ||
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require('../common'); | ||
const assert = require('assert'); | ||
const Readable = require('stream').Readable; | ||
const Duplex = require('stream').Duplex; | ||
const Transform = require('stream').Transform; | ||
|
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(function() { | ||
const readable = new Readable({ | ||
read: function(n) { | ||
var i = this._index++; | ||
if (i > this._max) | ||
this.push(null); | ||
else | ||
this.push(new Buffer('a')); | ||
} | ||
}); | ||
|
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readable._max = 1000; | ||
readable._index = 1; | ||
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var total = 0; | ||
readable.on('data', function(chunk) { | ||
total += chunk.length; | ||
}); | ||
|
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readable.on('end', function() { | ||
assert.equal(total, readable.bytesRead); | ||
}); | ||
})(); | ||
|
||
(function() { | ||
const readable = new Readable({ | ||
read: function(n) { | ||
var i = this._index++; | ||
if (i > this._max) | ||
this.push(null); | ||
else | ||
this.push(new Buffer('a')); | ||
} | ||
}); | ||
|
||
readable._max = 1000; | ||
readable._index = 1; | ||
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var total = 0; | ||
readable.setEncoding('utf8'); | ||
readable.on('data', function(chunk) { | ||
total += Buffer.byteLength(chunk); | ||
}); | ||
|
||
readable.on('end', function() { | ||
assert.equal(total, readable.bytesRead); | ||
}); | ||
})(); | ||
|
||
(function() { | ||
const duplex = new Duplex({ | ||
read: function(n) { | ||
var i = this._index++; | ||
if (i > this._max) | ||
this.push(null); | ||
else | ||
this.push(new Buffer('a')); | ||
}, | ||
write: function(chunk, encoding, next) { | ||
next(); | ||
} | ||
}); | ||
|
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duplex._max = 1000; | ||
duplex._index = 1; | ||
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var total = 0; | ||
duplex.setEncoding('utf8'); | ||
duplex.on('data', function(chunk) { | ||
total += Buffer.byteLength(chunk); | ||
}); | ||
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duplex.on('end', function() { | ||
assert.equal(total, duplex.bytesRead); | ||
}); | ||
})(); | ||
|
||
(function() { | ||
const readable = new Readable({ | ||
read: function(n) { | ||
var i = this._index++; | ||
if (i > this._max) | ||
this.push(null); | ||
else | ||
this.push(new Buffer('{"key":"value"}')); | ||
} | ||
}); | ||
readable._max = 1000; | ||
readable._index = 1; | ||
|
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const transform = new Transform({ | ||
readableObjectMode : true, | ||
transform: function(chunk, encoding, next) { | ||
next(null, JSON.parse(chunk)); | ||
}, | ||
flush: function(done) { | ||
done(); | ||
} | ||
}); | ||
|
||
var total = 0; | ||
readable.on('data', function(chunk) { | ||
total += chunk.length; | ||
}); | ||
|
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transform.on('end', function() { | ||
assert.equal(0, transform.bytesRead); | ||
assert.equal(total, readable.bytesRead); | ||
}); | ||
readable.pipe(transform); | ||
})(); |