Add option to write_graphite: DropDuplicateFields

This option drops duplicate type and type_instance fields or duplicate
type and plugin fields.

example_host.memory.memory.cached becomes example_host.memory.cached
example_host.cpu.0.cpu.idle becomes example_host.cpu.0.idle

diff --git a/src/collectd.conf.in b/src/collectd.conf.in
index 0fc13dc..7ac9f2d 100644 (file)
--- a/src/collectd.conf.in
+++ b/src/collectd.conf.in
@@ -1415,6 +1415,7 @@
 #    StoreRates true
 #    AlwaysAppendDS false
 #    EscapeCharacter "_"
+#    DropDuplicateFields false
 #  </Node>
 #</Plugin>
 

diff --git a/src/utils_format_graphite.c b/src/utils_format_graphite.c
index e523420..c726265 100644 (file)
--- a/src/utils_format_graphite.c
+++ b/src/utils_format_graphite.c
@@ -150,18 +150,25 @@ static int gr_format_name (char *ret, int ret_len,
         sstrncpy (tmp_plugin, n_plugin, sizeof (tmp_plugin));
 
     if (n_type_instance[0] != '\0')
-        ssnprintf (tmp_type, sizeof (tmp_type), "%s%c%s",
-            n_type,
-            (flags & GRAPHITE_SEPARATE_INSTANCES) ? '.' : '-',
-            n_type_instance);
+        if ((flags & GRAPHITE_DROP_DUPE_FIELDS) && strcmp(n_plugin, n_type) == 0)
+            sstrncpy (tmp_type, n_type_instance, sizeof (tmp_type));
+        else
+            ssnprintf (tmp_type, sizeof (tmp_type), "%s%c%s",
+                n_type,
+                (flags & GRAPHITE_SEPARATE_INSTANCES) ? '.' : '-',
+                n_type_instance);
     else
         sstrncpy (tmp_type, n_type, sizeof (tmp_type));
 
     /* Assert always_append_ds -> ds_name */
     assert (!(flags & GRAPHITE_ALWAYS_APPEND_DS) || (ds_name != NULL));
     if (ds_name != NULL)
-        ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s",
-            prefix, n_host, postfix, tmp_plugin, tmp_type, ds_name);
+        if ((flags & GRAPHITE_DROP_DUPE_FIELDS) && strcmp(tmp_plugin, tmp_type) == 0)
+            ssnprintf (ret, ret_len, "%s%s%s.%s.%s",
+                prefix, n_host, postfix, tmp_plugin, ds_name);
+        else
+            ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s",
+                prefix, n_host, postfix, tmp_plugin, tmp_type, ds_name);
     else
         ssnprintf (ret, ret_len, "%s%s%s.%s.%s",
             prefix, n_host, postfix, tmp_plugin, tmp_type);

diff --git a/src/utils_format_graphite.h b/src/utils_format_graphite.h
index 60576da..5165f9e 100644 (file)
--- a/src/utils_format_graphite.h
+++ b/src/utils_format_graphite.h
@@ -29,6 +29,7 @@
 #define GRAPHITE_STORE_RATES        0x01
 #define GRAPHITE_SEPARATE_INSTANCES 0x02
 #define GRAPHITE_ALWAYS_APPEND_DS   0x04
+#define GRAPHITE_DROP_DUPE_FIELDS   0x08
 
 int format_graphite (char *buffer,
     size_t buffer_size, const data_set_t *ds,

diff --git a/src/write_graphite.c b/src/write_graphite.c
index fe2376a..dd7f966 100644 (file)
--- a/src/write_graphite.c
+++ b/src/write_graphite.c
@@ -548,6 +548,9 @@ static int wg_config_node (oconfig_item_t *ci)
         else if (strcasecmp ("AlwaysAppendDS", child->key) == 0)
             cf_util_get_flag (child, &cb->format_flags,
                     GRAPHITE_ALWAYS_APPEND_DS);
+        else if (strcasecmp ("DropDuplicateFields", child->key) == 0)
+            cf_util_get_flag (child, &cb->format_flags,
+                    GRAPHITE_DROP_DUPE_FIELDS);
         else if (strcasecmp ("EscapeCharacter", child->key) == 0)
             config_set_char (&cb->escape_char, child);
         else