MAJOR: check: find out which port to use for health check at run time
HAProxy used to deduce port used for health checks when parsing configuration
at startup time.
Because of this way of working, it makes it complicated to change the port at
run time.
The current patch changes this behavior and makes HAProxy to choose the
port used for health checking when preparing the check task itself.
A new type of error is introduced and reported when no port can be found.
There won't be any impact on performance, since the process to find out the
port value is made of a few 'if' statements.
This patch also introduces a new check state CHK_ST_PORT_MISS: this flag is
used to report an error in the case when HAProxy needs to establish a TCP
connection to a server, to perform a health check but no TCP ports can be
found for it.
And last, it also introduces a new stream termination condition:
SF_ERR_CHK_PORT. Purpose of this flag is to report an error in the event when
HAProxy has to run a health check but no port can be found to perform it.
diff --git a/include/types/checks.h b/include/types/checks.h
index dd20184..283ff3d 100644
--- a/include/types/checks.h
+++ b/include/types/checks.h
@@ -41,6 +41,7 @@
#define CHK_ST_ENABLED 0x0004 /* this check is currently administratively enabled */
#define CHK_ST_PAUSED 0x0008 /* checks are paused because of maintenance (health only) */
#define CHK_ST_AGENT 0x0010 /* check is an agent check (otherwise it's a health check) */
+#define CHK_ST_PORT_MISS 0x0020 /* check can't be send because no port is configured to run it */
/* check status */
enum {
diff --git a/include/types/stream.h b/include/types/stream.h
index 17e74b8..0d8c500 100644
--- a/include/types/stream.h
+++ b/include/types/stream.h
@@ -73,6 +73,7 @@
#define SF_ERR_DOWN 0x00009000 /* the proxy killed a stream because the backend became unavailable */
#define SF_ERR_KILLED 0x0000a000 /* the proxy killed a stream because it was asked to do so */
#define SF_ERR_UP 0x0000b000 /* the proxy killed a stream because a preferred backend became available */
+#define SF_ERR_CHK_PORT 0x0000c000 /* no port could be found for a health check. TODO: check SF_ERR_SHIFT */
#define SF_ERR_MASK 0x0000f000 /* mask to get only stream error flags */
#define SF_ERR_SHIFT 12 /* bit shift */