Added dbServerStats() API for iocStats and similar

modules/database/src/ioc/db/dbServer.c

@@ -127,6 +127,26 @@ int dbServerClient(char *pBuf, size_t bufSize)
     return -1;
 }
 
+int dbServerStats(const char *name, unsigned *channels, unsigned *clients)
+{
+    dbServer *psrv = (dbServer *)ellFirst(&serverList);
+
+    if (state != running || !psrv)
+        return -1;
+
+    while (psrv) {
+        if (strcmp(name, psrv->name) == 0) {
+            if (!psrv->stats)
+                return -1;
+
+            psrv->stats(channels, clients);
+            return 0;
+        }
+        psrv = (dbServer *)ellNext(&psrv->node);
+    }
+    return -1;
+}
+
 #define STARTSTOP(routine, method, newState) \
 void routine(void) \
 { \

modules/database/src/ioc/db/dbServer.h

@@ -17,9 +17,6 @@
  * the dbServer interface provides allow the IOC to start, pause and stop
  * the servers together, and to provide status and debugging information
  * to the IOC user/developer through a common set of commands.
- *
- * @todo No API is provided yet for calling stats() methods.
- * Nothing in the IOC calls dbStopServers(), not sure where it should go.
  */
 
 #ifndef INC_dbServer_H
@@ -145,6 +142,18 @@ DBCORE_API void dbsr(unsigned level);
  */
 DBCORE_API int dbServerClient(char *pBuf, size_t bufSize);
 
+/** @brief Fetch statistics from named server.
+ *
+ * This is an API for iocStats and similar to fetch the number of channels
+ *  and clients connected to the named server layer.
+ * @param name Server name
+ * @param channels Where to return the channel count
+ * @param clients Where to return the client count
+ * @returns 0 on success; -1 if IOC isn't running, no such named server,
+ *  or that server doesn't implement the stats method.
+ */
+DBCORE_API int dbServerStats(const char *name, unsigned *channels, unsigned *clients);
+
 /** @brief Initialize all registered servers.
  *
  * Calls all dbServer::init() methods.