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Author	SHA1	Message	Date
isaacs	b0de1e4a41	stream: Fix unshift() race conditions Fix #5272 The consumption of a readable stream is a dance with 3 partners. 1. The specific stream Author (A) 2. The Stream Base class (B), and 3. The Consumer of the stream (C) When B calls the _read() method that A implements, it sets a 'reading' flag, so that parallel calls to _read() can be avoided. When A calls stream.push(), B knows that it's safe to start calling _read() again. If the consumer C is some kind of parser that wants in some cases to pass the source stream off to some other party, but not before "putting back" some bit of previously consumed data (as in the case of Node's websocket http upgrade implementation). So, stream.unshift() will generally never be called by A, but only called by C. Prior to this patch, stream.unshift() also unset the state.reading flag, meaning that C could indicate the end of a read, and B would dutifully fire off another _read() call to A. This is inappropriate. In the case of fs streams, and other variably-laggy streams that don't tolerate overlapped _read() calls, this causes big problems. Also, calling stream.shift() after the 'end' event did not raise any kind of error, but would cause very strange behavior indeed. Calling it after the EOF chunk was seen, but before the 'end' event was fired would also cause weird behavior, and could lead to data being lost, since it would not emit another 'readable' event. This change makes it so that: 1. stream.unshift() does not set state.reading = false 2. stream.unshift() is allowed up until the 'end' event. 3. unshifting onto a EOF-encountered and zero-length (but not yet end-emitted) stream will defer the 'end' event until the new data is consumed. 4. pushing onto a EOF-encountered stream is now an error. So, if you read(), you have that single tick to safely unshift() data back into the stream, even if the null chunk was pushed, and the length was 0.	12 years ago

Author

SHA1

Message

Date

isaacs

b0de1e4a41

stream: Fix unshift() race conditions

Fix #5272

The consumption of a readable stream is a dance with 3 partners.

1. The specific stream Author (A)
2. The Stream Base class (B), and
3. The Consumer of the stream (C)

When B calls the _read() method that A implements, it sets a 'reading'
flag, so that parallel calls to _read() can be avoided.  When A calls
stream.push(), B knows that it's safe to start calling _read() again.

If the consumer C is some kind of parser that wants in some cases to
pass the source stream off to some other party, but not before "putting
back" some bit of previously consumed data (as in the case of Node's
websocket http upgrade implementation).  So, stream.unshift() will
generally *never* be called by A, but *only* called by C.

Prior to this patch, stream.unshift() *also* unset the state.reading
flag, meaning that C could indicate the end of a read, and B would
dutifully fire off another _read() call to A.  This is inappropriate.
In the case of fs streams, and other variably-laggy streams that don't
tolerate overlapped _read() calls, this causes big problems.

Also, calling stream.shift() after the 'end' event did not raise any
kind of error, but would cause very strange behavior indeed.  Calling it
after the EOF chunk was seen, but before the 'end' event was fired would
also cause weird behavior, and could lead to data being lost, since it
would not emit another 'readable' event.

This change makes it so that:

1. stream.unshift() does *not* set state.reading = false
2. stream.unshift() is allowed up until the 'end' event.
3. unshifting onto a EOF-encountered and zero-length (but not yet
end-emitted) stream will defer the 'end' event until the new data is
consumed.
4. pushing onto a EOF-encountered stream is now an error.

So, if you read(), you have that single tick to safely unshift() data
back into the stream, even if the null chunk was pushed, and the length
was 0.

12 years ago

1 Commits (dce35146e0e52de32c3836d01ada10f3ebbe8792)