Make the dot substitution char configurable

Set the character used as the substitute in host and datasource names in
the collectd configuration block. The directive used to set this option
is DotCharactor and its default is '_' (underscore).

diff --git a/src/write_graphite.c b/src/write_graphite.c
index a468665..0de419f 100644 (file)
--- a/src/write_graphite.c
+++ b/src/write_graphite.c
@@ -51,10 +51,10 @@
 #include <netdb.h>
 
 #ifndef WG_FORMAT_NAME
-#define WG_FORMAT_NAME(ret, ret_len, vl, prefix, name) \
+#define WG_FORMAT_NAME(ret, ret_len, vl, cb, name) \
         wg_format_name (ret, ret_len, (vl)->host, (vl)->plugin, \
                          (vl)->plugin_instance, (vl)->type, \
-                         (vl)->type_instance, prefix, name)
+                         (vl)->type_instance, (cb)->prefix, name, (cb)->dotchar)
 #endif
 
 #ifndef WG_SEND_BUF_SIZE
@@ -72,6 +72,7 @@ struct wg_callback
     char    *host;
     int      port;
     char    *prefix;
+    char     dotchar;
 
     char     send_buf[WG_SEND_BUF_SIZE];
     size_t   send_buf_free;
@@ -308,7 +309,8 @@ static int wg_format_values (char *ret, size_t ret_len,
     return (0);
 }
 
-static int mangle_dots (char *dst, const char *src)
+static int swap_chars (char *dst, const char *src,
+        const char from, const char to)
 {
     size_t i;
 
@@ -316,9 +318,9 @@ static int mangle_dots (char *dst, const char *src)
 
     for (i = 0; i < strlen(src) ; i++)
     {
-        if (src[i] == '.')
+        if (src[i] == from)
         {
-            dst[i] = '_';
+            dst[i] = to;
             ++reps;
         }
         else
@@ -333,7 +335,7 @@ static int wg_format_name (char *ret, int ret_len,
         const char *hostname,
         const char *plugin, const char *plugin_instance,
         const char *type, const char *type_instance,
-        const char *prefix, const char *ds_name)
+        const char *prefix, const char *ds_name, const char dotchar)
 {
     int  status;
     char *n_hostname = 0;
@@ -348,7 +350,7 @@ static int wg_format_name (char *ret, int ret_len,
         return (-1);
     }
 
-    if (mangle_dots(n_hostname, hostname) == -1)
+    if (swap_chars(n_hostname, hostname, '.', dotchar) == -1)
     {
         ERROR ("Unable to normalize hostname");
         return (-1);
@@ -360,7 +362,7 @@ static int wg_format_name (char *ret, int ret_len,
             ERROR ("Unable to allocate memory for normalized datasource name buffer");
             return (-1);
         }
-        if (mangle_dots(n_type_instance, type_instance) == -1)
+        if (swap_chars(n_type_instance, type_instance, '.', dotchar) == -1)
         {
             ERROR ("Unable to normalize datasource name");
             return (-1);
@@ -507,8 +509,7 @@ static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
         for (i = 0; i < ds->ds_num; i++)
         {
             /* Copy the identifier to `key' and escape it. */
-            status = WG_FORMAT_NAME (key, sizeof (key), vl, cb->prefix, \
-                    ds->ds[i].name);
+            status = WG_FORMAT_NAME (key, sizeof (key), vl, cb, ds->ds[i].name);
             if (status != 0)
             {
                 ERROR ("write_graphite plugin: error with format_name");
@@ -539,7 +540,7 @@ static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
     else
     {
         /* Copy the identifier to `key' and escape it. */
-        status = WG_FORMAT_NAME (key, sizeof (key), vl, cb->prefix, NULL);
+        status = WG_FORMAT_NAME (key, sizeof (key), vl, cb, NULL);
         if (status != 0)
         {
             ERROR ("write_graphite plugin: error with format_name");
@@ -601,6 +602,21 @@ static int config_set_number (int *dest,
     return (0);
 }
 
+static int config_set_char (char *dest,
+        oconfig_item_t *ci)
+{
+    if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
+    {
+        WARNING ("write_graphite plugin: The `%s' config option "
+                "needs exactly one string argument.", ci->key);
+        return (-1);
+    }
+
+    *dest = ci->values[0].value.string[0];
+
+    return (0);
+}
+
 static int config_set_string (char **ret_string,
         oconfig_item_t *ci)
 {
@@ -646,6 +662,7 @@ static int wg_config_carbon (oconfig_item_t *ci)
     cb->port = 2003;
     cb->prefix = NULL;
     cb->server = NULL;
+    cb->dotchar = '_';
 
     pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 
@@ -659,6 +676,8 @@ static int wg_config_carbon (oconfig_item_t *ci)
             config_set_number (&cb->port, child);
         else if (strcasecmp ("Prefix", child->key) == 0)
             config_set_string (&cb->prefix, child);
+        else if (strcasecmp ("DotCharacter", child->key) == 0)
+            config_set_char (&cb->dotchar, child);
         else
         {
             ERROR ("write_graphite plugin: Invalid configuration "