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BUG/MEDIUM: spoe: Return an error when the wrong ACK is received in sync mode

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This is required to let a message processing timed out. Because, when it
happens, there is no more context attached to the SPOE applet that sent the
NOTIFY frame. So when the ACK is received, it is too late. This is the same
situation when we receive the wrong ACK. It is invalid in sync mode. Otherwise,
the SPOE applet remains in the state "WAITING_SYNC_ACK" until the idle timeout
is reached. In such case, the applet is seen as busy and it is unusable. If this
happens too often, more and more applets will be created because some others are
blocked. If there is a maxconn on the SPOE backend, all processings will be
drastically slowdown.

Returning an error in such cases, in sync mode, allow us to terminate the SPOE
applet. Because it means the agent is unresponsive or too slow.

Note this bug exists only if the sync mode is used.

This patch must be backported in 1.8.
This commit is contained in:
Christopher Faulet 2018-05-25 10:42:37 +02:00 committed by Willy Tarreau
parent 44e609bfa5
commit 3a47e5e25c
1 changed files with 2 additions and 0 deletions
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2
src/flt_spoe.c
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@ -1030,6 +1030,8 @@ spoe_handle_agentack_frame(struct appctx *appctx, struct spoe_context **ctx,
(unsigned int)stream_id, (unsigned int)frame_id);
SPOE_APPCTX(appctx)->status_code = SPOE_FRM_ERR_FRAMEID_NOTFOUND;
if (appctx->st0 == SPOE_APPCTX_ST_WAITING_SYNC_ACK)
return -1;
return 0;
found: