Fixed packet send callback issues #130
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There were two issues here. 1. When Socket.send called with or without callback alternately, the trigger order is incorrect. 2. The 'drain' event from transport is one per packet for transports supporting framing like websocket and is all in one for those without framing like polling.
rauchg
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Dec 26, 2012
Fixed packet send callback issues
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@roamm this makes a test fail: |
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@guille I fixed this and added 2 more test cases, in a new pull request. |
darrachequesne
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May 8, 2020
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darrachequesne
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Jun 13, 2024
With the `websocket` transport, the callbacks which indicate that the
packets are actually written were not properly called.
Example:
```js
socket.send("hello", () => {
// the message has been written to the underlying transport
});
```
The bug was caused by the `websocket` transport (and `webtransport` as
well) having its `supportsFraming` property set to `true`, despite
having been changed in [1] to emit a single `drain` event for each
batch of messages written to the transport like the `polling` transport
always did. Note that although [1] is partially reverted in [2], the
new `drain` event behavior is preserved as called out in that commit's
message.
The `supportsFraming` attribute was introduced in [3] (amended by [4])
as a way to distinguish transports that emit one `drain` per message
from those that emit one `drain` per batch. Since the delivery of
`send` callbacks depends on matching `drain` events with
`transport.send` calls, that distinction is vital to correct behavior.
However, now that all transports have converged to "one `drain` per
batch" behavior, this `supportsFraming` property can be retired (and
the code for calling callbacks simplified).
[1]: #618
[2]: a65a047
[3]: #130
[4]: #132
Related: #698
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There were two issues here.