MINOR: config: Add failifnotcap() to emit an alert on proxy capabilities

This function must be used to emit an alert if a proxy does not have at
least one of the requested capabilities. An additional message may be
appended to the alert.

diff --git a/include/haproxy/cfgparse.h b/include/haproxy/cfgparse.h
index 85bd164f67a9eedbc17824b026817b47f664cfac..ecb5ffd1e4c90d6c5e7e29e2ad8840fe54149ca9 100644 (file)
--- a/include/haproxy/cfgparse.h
+++ b/include/haproxy/cfgparse.h
@@ -141,6 +141,31 @@ static inline int warnifnotcap(struct proxy *proxy, int cap, const char *file, i
        return 0;
 }
 
+/*
+ * Sends an alert if proxy <proxy> does not have at least one of the
+ * capabilities in <cap>. An optional <hint> may be added at the end
+ * of the alert to help the user. Returns 1 if an alert was emitted
+ * or 0 if the condition is valid.
+ */
+static inline int failifnotcap(struct proxy *proxy, int cap, const char *file, int line, const char *arg, const char *hint)
+{
+       char *msg;
+
+       switch (cap) {
+       case PR_CAP_BE: msg = "no backend"; break;
+       case PR_CAP_FE: msg = "no frontend"; break;
+       case PR_CAP_BE|PR_CAP_FE: msg = "neither frontend nor backend"; break;
+       default: msg = "not enough"; break;
+       }
+
+       if (!(proxy->cap & cap)) {
+               ha_alert("parsing [%s:%d] : '%s' not allowed because %s '%s' has %s capability.%s\n",
+                        file, line, arg, proxy_type_str(proxy), proxy->id, msg, hint ? hint : "");
+               return 1;
+       }
+       return 0;
+}
+
 /* simplified way to define a section parser */
 #define REGISTER_CONFIG_SECTION(name, parse, post)                            \
        INITCALL3(STG_REGISTER, cfg_register_section, (name), (parse), (post))