Add mosquitto_client_id_hashv broker helper function

include/mosquitto/broker.h

@@ -616,6 +616,14 @@ mosq_EXPORT bool mosquitto_client_clean_session(const struct mosquitto *client);
 mosq_EXPORT const char *mosquitto_client_id(const struct mosquitto *client);
 
 
+/*
+ * Function: mosquitto_client_id_hashv
+ *
+ * Retrieve the hash value associated with a client id.
+ */
+mosq_EXPORT unsigned mosquitto_client_id_hashv(const struct mosquitto *client);
+
+
 /*
  * Function: mosquitto_client_keepalive
  *

lib/mosquitto_internal.h

@@ -302,6 +302,7 @@ struct mosquitto {
 	char *id;
 	char *username;
 	char *password;
+	unsigned id_hashv;
 	uint16_t keepalive;
 	uint16_t last_mid;
 	enum mosquitto_client_state state;

src/context.c

@@ -329,7 +329,8 @@ void context__add_to_by_id(struct mosquitto *context)
 {
 	if(context->in_by_id == false){
 		context->in_by_id = true;
-		HASH_ADD_KEYPTR(hh_id, db.contexts_by_id, context->id, strlen(context->id), context);
+		HASH_VALUE(context->id, strlen(context->id), context->id_hashv);
+		HASH_ADD_KEYPTR_BYHASHVALUE(hh_id, db.contexts_by_id, context->id, strlen(context->id), context->id_hashv, context);
 	}
 }
 
@@ -348,6 +349,7 @@ void context__remove_from_by_id(struct mosquitto *context)
 		if(context_found){
 			HASH_DELETE(hh_id, db.contexts_by_id, context_found);
 		}
+		context->id_hashv = 0;
 		context->in_by_id = false;
 	}
 }

src/plugin_public.c

@@ -104,6 +104,16 @@ BROKER_EXPORT const char *mosquitto_client_id(const struct mosquitto *client)
 }
 
 
+BROKER_EXPORT unsigned mosquitto_client_id_hashv(const struct mosquitto *client)
+{
+	if(client){
+		return client->id_hashv;
+	}else{
+		return 0;
+	}
+}
+
+
 BROKER_EXPORT int mosquitto_client_keepalive(const struct mosquitto *client)
 {
 	if(client){