Add SHMLOG records for more backend fetch failures

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4233 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_fetch.c

@@ -351,8 +351,10 @@ FetchHdr(struct sess *sp)
 	hp = sp->wrk->bereq;
 
 	VBE_GetFd(sp);
-	if (sp->vbe == NULL)
+	if (sp->vbe == NULL) {
+		WSP(sp, SLT_FetchError, "no backend connection");
 		return (__LINE__);
+	}
 	vc = sp->vbe;
 	/* Inherit the backend timeouts from the selected backend */
 	SES_InheritBackendTimeouts(sp);
@@ -372,6 +374,7 @@ FetchHdr(struct sess *sp)
 	/* Deal with any message-body the request might have */
 	i = FetchReqBody(sp);
 	if (WRW_FlushRelease(w) || i > 0) {
+		WSP(sp, SLT_FetchError, "backend write error: %d", errno);
 		VBE_ClosedFd(sp);
 		/* XXX: other cleanup ? */
 		return (__LINE__);
@@ -389,19 +392,21 @@ FetchHdr(struct sess *sp)
 	TCP_set_read_timeout(vc->fd, sp->first_byte_timeout);
 	do {
 		i = HTC_Rx(sp->wrk->htc);
+		if (i < 0) {
+			WSP(sp, SLT_FetchError,
+			    "http read error: %d", errno);
+			VBE_ClosedFd(sp);
+			/* XXX: other cleanup ? */
+			return (__LINE__);
+		}
 		TCP_set_read_timeout(vc->fd, sp->between_bytes_timeout);
 	}
 	while (i == 0);
 
-	if (i < 0) {
-		VBE_ClosedFd(sp);
-		/* XXX: other cleanup ? */
-		return (__LINE__);
-	}
-
 	hp = sp->wrk->beresp;
 
 	if (http_DissectResponse(sp->wrk, sp->wrk->htc, hp)) {
+		WSP(sp, SLT_FetchError, "http format error");
 		VBE_ClosedFd(sp);
 		/* XXX: other cleanup ? */
 		return (__LINE__);
@@ -552,5 +557,3 @@ Fetch_Init(void)
 
 	CLI_AddFuncs(DEBUG_CLI, debug_cmds);
 }
-
-