Susan Hinrichs created TS-3578:
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Summary: Rearrange Client Session processing to give access to
socket at SSN_CLOSE for all protocols
Key: TS-3578
URL: https://issues.apache.org/jira/browse/TS-3578
Project: Traffic Server
Issue Type: Improvement
Components: HTTP, HTTP/2, SPDY
Reporter: Susan Hinrichs
I wanted to use the tcpinfo plugin look at the kernel measured RTT.
Unfortunately, there was really only visibility for HTTP/1.x. Not HTTP/2 or
SPDY. In the H2 and SPDY cases the underlying NetVC is a PluginVC and does not
have access to the underlying socket.
With HTTP/2, the SSN_CLOSE hook would trigger, but by the time the SSN_CLOSE
hook would go off, the netVC had already been closed.
I propose making the following changes.
1. Make SpdyClientSession a subclass of ProxyClientSession, so SSN_CLOSE_HOOK
can be triggered there too.
2. Rearrange the hook calling and net vc close so the SSN_CLOSE hook is called
before the net vc is closed.
I've made both changes on my dev build, and in my simple tests, the tcpinfo
plugin is recording times for traffic on top of HTTP/1.1, SPDY, and HTTP/2.
Since this involves rearranging some of the bowels of the protocol processing,
I'll set up a pull request for broader review.
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