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view conf/koi-win @ 8355:ad3a6f069498 quic

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Added proper handling of connection close phases. There are following flags in quic connection: closing - true, when a connection close is initiated, for whatever reason draining - true, when a CC frame is received from peer The following state machine is used for closing: +------------------+ | I/HS/AD | +------------------+ | | | | | V | | immediate close initiated: | | reasons: close by top-level protocol, fatal error | | + sends CC (probably with app-level message) | | + starts close_timer: 3 * PTO (current probe timeout) | | | | | V | | +---------+ - Reply to input with CC (rate-limited) | | | CLOSING | - Close/Reset all streams | | +---------+ | | | | | V V | | receives CC | | | | idle | | timer | | | V | | +----------+ | - MUST NOT send anything (MAY send a single CC) | | DRAINING | | - if not already started, starts close_timer: 3 * PTO | +----------+ | - if not already done, close all streams | | | | | | | close_timer fires | | V V +------------------------+ | CLOSED | - clean up all the resources, drop connection +------------------------+ state completely The ngx_quic_close_connection() function gets an "rc" argument, that signals reason of connection closing: NGX_OK - initiated by application (i.e. http/3), follow state machine NGX_DONE - timedout (while idle or draining) NGX_ERROR - fatal error, destroy connection immediately The PTO calculations are not yet implemented, hardcoded value of 5s is used.
author Vladimir Homutov <vl@nginx.com>
date Thu, 23 Apr 2020 13:41:08 +0300
parents 400711951595
children
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