Re: [quicwg/base-drafts] Fix for #3835 (#4014)

Martin Thomson <notifications@github.com> Thu, 20 August 2020 00:28 UTC

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Date: Wed, 19 Aug 2020 17:28:42 -0700
From: Martin Thomson <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Fix for #3835 (#4014)
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@martinthomson requested changes on this pull request.

I didn't want to do this.  I believe that more now that I've seen this.  These are both wrong, which demonstrates how this is non-trivial.  That's why this was originally limited to transitions.

> +              | Recv STREAM / STREAM_DATA_BLOCKED / RESET_STREAM
+              | Create Bidirectional Stream (Sending)
+              | Recv MAX_STREAM_DATA / STOP_SENDING (Bidirectional)
+              | Create Higher-Numbered Stream
+              v
+          +-------+
+          | Recv  | Recv RESET_STREAM
+       +->|       |-----------------------.
+Recv   |  +-------+                       |
+STREAM |    | |                           |
+       +----+ | Recv STREAM + FIN         |
+              v                           |
+          +-------+                       |
+          | Size  | Recv RESET_STREAM     |
+          | Known |---------------------->|
+          +-------+                       |

You receive STREAM frames here as well.

> +       +->|       |-----------------------.
+Recv   |  +-------+                       |
+STREAM |    | |                           |
+       +----+ | Recv STREAM + FIN         |
+              v                           |
+          +-------+                       |
+          | Size  | Recv RESET_STREAM     |
+          | Known |---------------------->|
+          +-------+                       |
+              |                           |
+              | Recv All Data             |
+              v                           v
+          +-------+ Recv RESET_STREAM +-------+
+          | Data  |--- (optional) --->| Reset |
+          | Recvd |  Recv All Data    | Recvd |
+          +-------+<-- (optional) ----+-------+

And here, in case of reordering or spurious retransmission.

> +               |      STREAM_DATA_BLOCKED  |
+               |                           |
+               | Peer Creates              |
+               |      Bidirectional Stream |
+               v                           |
+           +-------+                       |
+           | Send  | Send RESET_STREAM     |
+       +-->|       |---------------------->|
+Send   |   +-------+                       |
+STREAM |     | |                           |
+       +-----+ | Send STREAM + FIN         |
+               v                           v
+           +-------+                   +-------+
+           | Data  | Send RESET_STREAM | Reset |
+           | Sent  |------------------>| Sent  |
+           +-------+                   +-------+

You send STREAM frames here too when packets get declared lost.

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