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'use strict';
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const common = require('../common');
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const Readable = require('stream').Readable;
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const r = new Readable();
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const N = 256 * 1024;
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// Go ahead and allow the pathological case for this test.
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// Yes, it's an infinite loop, that's the point.
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process.maxTickDepth = N + 2;
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let reads = 0;
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stream: There is no _read cb, there is only push
This makes it so that `stream.push(chunk)` is the only way to signal the
end of reading, removing the confusing disparity between the
callback-style _read method, and the fact that most real-world streams
do not have a 1:1 corollation between the "please give me data" event,
and the actual arrival of a chunk of data.
It is still possible, of course, to implement a `CallbackReadable` on
top of this. Simply provide a method like this as the callback:
function readCallback(er, chunk) {
if (er)
stream.emit('error', er);
else
stream.push(chunk);
}
However, *only* fs streams actually would behave in this way, so it
makes not a lot of sense to make TCP, TLS, HTTP, and all the rest have
to bend into this uncomfortable paradigm.
12 years ago
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r._read = function(n) {
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const chunk = reads++ === N ? null : Buffer.allocUnsafe(1);
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stream: There is no _read cb, there is only push
This makes it so that `stream.push(chunk)` is the only way to signal the
end of reading, removing the confusing disparity between the
callback-style _read method, and the fact that most real-world streams
do not have a 1:1 corollation between the "please give me data" event,
and the actual arrival of a chunk of data.
It is still possible, of course, to implement a `CallbackReadable` on
top of this. Simply provide a method like this as the callback:
function readCallback(er, chunk) {
if (er)
stream.emit('error', er);
else
stream.push(chunk);
}
However, *only* fs streams actually would behave in this way, so it
makes not a lot of sense to make TCP, TLS, HTTP, and all the rest have
to bend into this uncomfortable paradigm.
12 years ago
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r.push(chunk);
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};
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r.on('readable', function onReadable() {
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if (!(r._readableState.length % 256))
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console.error('readable', r._readableState.length);
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r.read(N * 2);
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});
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r.on('end', common.mustCall(function() {}));
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r.read(0);
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