From 16842a01fa7785f240677687a2212ed575b384e2 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Thu, 20 Mar 2014 21:06:14 +0000
Subject: allow type setting only once


diff --git a/client_list.c b/client_list.c
index 51c50fa..92f7b91 100644
--- a/client_list.c
+++ b/client_list.c
@@ -25,6 +25,19 @@
 #include "client_list.h"
 #include "datatypes.h"
 
+char* client_type_tostring(client_type_t type)
+{
+  switch(type)
+  {
+  case MASTER: return "master";
+  case STANDBY: return "standby";
+  case MASTER_HB: return "master_hb";
+  case STANDBY_HB: return "standby_hb";
+  case DEFAULT: return "unspecified";
+  }
+  return "<invalid>";
+}
+
 client_t* client_get_last(client_t* first)
 {
   if(!first)
diff --git a/client_list.h b/client_list.h
index 9ff5754..a23e76e 100644
--- a/client_list.h
+++ b/client_list.h
@@ -26,6 +26,7 @@
 
 enum client_type_enum { DEFAULT, MASTER, STANDBY, MASTER_HB, STANDBY_HB };
 typedef enum client_type_enum client_type_t;
+char* client_type_tostring(client_type_t);
 
 struct client_struct {
   int fd;
diff --git a/switchctl.c b/switchctl.c
index 7390e0a..37fae8b 100644
--- a/switchctl.c
+++ b/switchctl.c
@@ -88,7 +88,7 @@ void send_usage(int fd)
 
   send_response(fd, "Usage: ");
   send_response(fd, "  help      prints this");
-  send_response(fd, "  type      set client type, one of: master, standby, heartbeat");
+  send_response(fd, "  type      set client type, one of: master, standby, master_hb, standby_hb");
   send_response(fd, "  channel   switch to channel main or music");
   send_response(fd, "            client type master and standby only");
   send_response(fd, "  mode      switch to mode master or standby");
@@ -348,24 +348,30 @@ void process_cmd_type(const char* param, int fd, client_t* client_lst)
   if(param) {
     client_t* client = client_find(client_lst, fd);
     if(client) {
-      if(!strncmp(param, "master", 6)) {
-        client->type = MASTER;
-        client->gpi_listener = 1;
-      }
-      else if(!strncmp(param, "standby", 7)) {
-        client->type = STANDBY;
-        client->gpi_listener = 1;
+      if(client->type == DEFAULT) {
+        if(!strncmp(param, "master", 6)) {
+          client->type = MASTER;
+          client->gpi_listener = 1;
+        }
+        else if(!strncmp(param, "standby", 7)) {
+          client->type = STANDBY;
+          client->gpi_listener = 1;
+        }
+        else if(!strncmp(param, "master_hb", 9))
+          client->type = MASTER_HB;
+        else if(!strncmp(param, "standby_hb", 10))
+          client->type = STANDBY_HB;
+        else {
+          log_printf(DEBUG, "unkown client type '%s'", param);
+          send_response(fd, "EEE: type: unknown client type");
+          return;
+        }
+        log_printf(DEBUG, "client %d type set to %s", fd, param);
       }
-      else if(!strncmp(param, "master_hb", 9))
-        client->type = MASTER_HB;
-      else if(!strncmp(param, "standby_hb", 10))
-        client->type = STANDBY_HB;
       else {
-        log_printf(DEBUG, "unkown client type '%s'", param);
-        send_response(fd, "EEE: type: unknown client type");
-        return;
+        log_printf(ERROR, "unable to set client type for %d: type already set to %s", fd, client_type_tostring(client->type));
+        send_response(fd, "EEE: type: type already set");
       }
-      log_printf(DEBUG, "client %d type set to %s", fd, param);
     }
     else {
       log_printf(ERROR, "unable to set client type for %d: client not found", fd);
-- 
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