Create a more descriptive process title for connections.

This commit introduces the function
`pgagroal_set_connection_proc_title()` that builds a process title
with the form:

      user@host:port/database

using in turn the `pgagroal_set_proc_title` function.
The `pgagroal_set_connection_proc_title` function is used only by the
`worker` process stuff and required to identify the primary server (to
get the hostname and port).

Related to agroal#215.

src/include/pgagroal.h

@@ -62,7 +62,6 @@ extern "C" {
 #define PGAGROAL_DEFAULT_ADMINS_FILE PGAGROAL_DEFAULT_CONFIGURATION_PATH "pgagroal_admins.conf"
 #define PGAGROAL_DEFAULT_SUPERUSER_FILE PGAGROAL_DEFAULT_CONFIGURATION_PATH "pgagroal_superuser.conf"
 
-
 #define MAX_BUFFER_SIZE      65535
 #define DEFAULT_BUFFER_SIZE  65535
 #define SECURITY_BUFFER_SIZE   512

src/include/utils.h

@@ -254,6 +254,20 @@ pgagroal_base64_decode(char* encoded, size_t encoded_length, char** raw, int* ra
 void
 pgagroal_set_proc_title(int argc, char** argv, char* s1, char* s2);
 
+/**
+ * Sets the process title for a given connection.
+ *
+ * Uses `pgagroal_set_proc_title` to build an information string
+ * with the form
+ *    user@host:port/database
+ *
+ * @param argc the number of arguments
+ * @param argv command line arguments
+ * @param connection the struct connection pointer for the established connection.
+ */
+void
+pgagroal_set_connection_proc_title(int argc, char** argv, struct connection* connection);
+
 #ifdef DEBUG
 
 /**

src/libpgagroal/utils.c

@@ -30,6 +30,7 @@
 #include <pgagroal.h>
 #include <logging.h>
 #include <utils.h>
+#include <server.h>
 
 /* system */
 #include <ev.h>
@@ -758,10 +759,10 @@ pgagroal_set_proc_title(int argc, char** argv, char* s1, char* s2)
    // when the application was started
    if (max_process_title_size == 0)
    {
-       for (int i = 0; i < argc; i++)
-       {
-           max_process_title_size += strlen(argv[i]) + 1;
-       }
+      for (int i = 0; i < argc; i++)
+      {
+         max_process_title_size += strlen(argv[i]) + 1;
+      }
    }
 
    // compose the new title
@@ -791,6 +792,25 @@ pgagroal_set_proc_title(int argc, char** argv, char* s1, char* s2)
 #endif
 }
 
+void
+pgagroal_set_connection_proc_title(int argc, char** argv, struct connection* connection)
+{
+   struct configuration* config;
+   int primary;
+   char info[MISC_LENGTH];
+
+   config = (struct configuration*)shmem;
+
+   pgagroal_get_primary(&primary);
+
+   snprintf(info, MISC_LENGTH, "%s@%s:%d",
+            connection->username,
+            config->servers[primary].host,
+            config->servers[primary].port);
+
+   pgagroal_set_proc_title(argc, argv, info, connection->database);
+}
+
 #ifdef DEBUG
 
 int

src/libpgagroal/worker.c

@@ -106,7 +106,7 @@ pgagroal_worker(int client_fd, char* address, char** argv)
       pgagroal_prometheus_client_active_add();
 
       pgagroal_pool_status();
-      pgagroal_set_proc_title(1, argv, config->connections[slot].username, config->connections[slot].database);
+      pgagroal_set_connection_proc_title(1, argv, &config->connections[slot]);
 
       if (config->pipeline == PIPELINE_PERFORMANCE)
       {