When called must either return a chunk of data or
null. If applicable return a chunk of data that matches the number of
bytes asked for. If no bytes are asked for it's recommended you return as large a chunk as you can.
If you return
null, it's expected you will emit
'readable' in the future to signal that more data is available. After emitting
'readable' it's expected that read's will return a non
Pipe allows you to pipe a readable stream into a writable stream. Pipe does the following:
- it emits
'pipe'on the writable stream with the readable stream as the value.
- it reads from the readable stream and write's each chunk returned from
readto the writable stream
- if the readable stream returns
nullfrom a read it waits until the readable stream emits
'readable'before it continues reading
- if the writable stream's
falseit stops reading until the writable stream emits
falsepipe will call
endon the writable stream when the readable stream emits
A readable stream emit's readable to signal that there is data to be read. i.e. future
read calls will return a chunk of data.
A readable stream emits
'end' when there is no more data to be read. The underlying source of data is depleted.
'end' implies that the source of data has ended cleanly.
A readable stream emits
'error' when some error has occurred. This generally means that the stream is in state beyond repair and should be aborted.
Writes a chunk of data to the underlying source of data. If applicable ensure you apply the encoding to the chunk. If this returns
false then the writable stream is saying that you are writing too fast and should slow down. When
false is returned, the writable stream will emit
'drain' in the future to signal that it's ok to write again.
Ending the streams means your saying there is no more data to be written and it's fine to clean up any underlying data sources. It's optional to write a single chunk when ending the stream (with encoding if applicable).
Emitted by a writable stream when it's ok to write again.
Emitted by a writable stream when it's finished writing everything. This happens after
.end() has been called.
Emitted by a writable stream when someone calls pipe on a readable stream with the writable as the destination.
src is the readable stream which is piping into the writable stream.
Note: This need not be implemented. A correct pipe implementation should emit
"pipe" on the target for you.
Emitted by the writable stream when an error occurs. Assume that the stream is in a corrupted state after it emits error.