Howdy all,
humour me another round. My question today:
The writable.end() call takes three arguments: (1) chunk to write if any, (2)
encoding, (3) callback for when all writing is done.
Assuming there is nothing left to write, I am hoping it is okay to pass null,
null to the first two arguments.
And I am guessing it is also safe to assume that the end() will be queued up
after any pending write()s.
With regard to the callback argument, the docs say:
> callback Function Optional. Called when the final chunk is successfully
> written.
My question is what does “successfully written” really mean? In particular, can
the callback rely on fs’s file.bytesWritten to have the correct value? The doc
for the latter says:
> The number of bytes written so far. Does not include data that is still
> queued for writing.
These two bits suggest the below is safe to do:
req.on
(
‘data’,
function(chunk)
{
console.log(“Sending “ + chunk.length + “ bytes to be written.”);
write_stream.write(chunk);
}
);
req.on
(
‘end’,
write_stream.end
(
null, null,
function()
{
console.log(“Yay, the file is written. Size is “ +
write_stream.bytesWritten);
}
);
);
But in my experience, it does not seem to be. If I send 1000 bytes, the first
log prints, say, 4 times with 250 byte writes, as expected. But the
bytesWritten value is much smaller than the 1000 bytes sent (all numbers are
made up).
I can post more fleshed out sample code if/once you confirm my assumptions are
correct. I realise there are other ways to do this (e.g: pipe, or listen to the
‘final’ event for the writeable, etc), but I am curious if the above is even
expected behaviour.
Thank you,
—ravi
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