write_riemann plugin: Implement communication over TCP.

diff --git a/src/collectd.conf.in b/src/collectd.conf.in
index 9f0390e..699c0e0 100644 (file)
--- a/src/collectd.conf.in
+++ b/src/collectd.conf.in
@@ -1065,6 +1065,7 @@
 #      <Node "example">
 #              Host "localhost"
 #              Port 5555
+#              Protocol UDP
 #              StoreRates true
 #              AlwaysAppendDS false
 #      </Node>

diff --git a/src/collectd.conf.pod b/src/collectd.conf.pod
index 5ada55a..aa2871d 100644 (file)
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@ -5546,7 +5546,9 @@ Synopsis:
    <Node "example">
      Host "localhost"
      Port "5555"
-     StoreRates false
+     Protocol UDP
+     StoreRates true
+     AlwaysAppendDS false
      Delay 10
    </Node>
    Tag "foobar"
@@ -5573,7 +5575,12 @@ Hostname or address to connect to. Defaults to C<localhost>.
 
 Service name or port number to connect to. Defaults to C<5555>.
 
-=item B<StoreRates> B<false>|B<true>
+=item B<Protocol> B<UDP>|B<TCP>
+
+Specify the protocol to use when communicating with I<Riemann>. Defaults to
+B<UDP>.
+
+=item B<StoreRates> B<true>|B<false>
 
 If set to B<true> (the default), convert counter values to rates. If set to
 B<false> counter values are stored as is, i.e. as an increasing integer number.

diff --git a/src/write_riemann.c b/src/write_riemann.c
index 62d75f3..df0c373 100644 (file)
--- a/src/write_riemann.c
+++ b/src/write_riemann.c
@@ -47,6 +47,7 @@ struct riemann_host {
        _Bool                    always_append_ds;
        char                    *node;
        char                    *service;
+       _Bool                    use_tcp;
        int                      s;
 
        int                      reference_count;
@@ -118,6 +119,9 @@ riemann_send(struct riemann_host *host, Msg const *msg)
        }
 
        buffer_len = msg__get_packed_size(msg);
+       if (host->use_tcp)
+               buffer_len += 4;
+
        buffer = malloc (buffer_len);
        if (buffer == NULL) {
                pthread_mutex_unlock (&host->lock);
@@ -126,7 +130,16 @@ riemann_send(struct riemann_host *host, Msg const *msg)
        }
        memset (buffer, 0, buffer_len);
 
-       msg__pack(msg, buffer);
+       if (host->use_tcp)
+       {
+               uint32_t length = htonl ((uint32_t) (buffer_len - 4));
+               memcpy (buffer, &length, 4);
+               msg__pack(msg, buffer + 4);
+       }
+       else
+       {
+               msg__pack(msg, buffer);
+       }
 
        status = (int) swrite (host->s, buffer, buffer_len);
        if (status != 0)
@@ -460,7 +473,7 @@ riemann_connect(struct riemann_host *host)
        memset(&hints, 0, sizeof(hints));
        memset(&service, 0, sizeof(service));
        hints.ai_family = AF_UNSPEC;
-       hints.ai_socktype = SOCK_DGRAM;
+       hints.ai_socktype = host->use_tcp ? SOCK_STREAM : SOCK_DGRAM;
 #ifdef AI_ADDRCONFIG
        hints.ai_flags |= AI_ADDRCONFIG;
 #endif
@@ -562,6 +575,7 @@ riemann_config_node(oconfig_item_t *ci)
        host->service = NULL;
        host->store_rates = 1;
        host->always_append_ds = 0;
+       host->use_tcp = 0;
 
        status = cf_util_get_string (ci, &host->name);
        if (status != 0) {
@@ -590,6 +604,28 @@ riemann_config_node(oconfig_item_t *ci)
                                                "option.");
                                break;
                        }
+               } else if (strcasecmp ("Protocol", child->key) == 0) {
+                       char tmp[16];
+                       status = cf_util_get_string_buffer (child,
+                                       tmp, sizeof (tmp));
+                       if (status != 0)
+                       {
+                               ERROR ("write_riemann plugin: cf_util_get_"
+                                               "string_buffer failed with "
+                                               "status %i.", status);
+                               break;
+                       }
+
+                       if (strcasecmp ("UDP", tmp) == 0)
+                               host->use_tcp = 0;
+                       else if (strcasecmp ("TCP", tmp) == 0)
+                               host->use_tcp = 1;
+                       else
+                               WARNING ("write_riemann plugin: The value "
+                                               "\"%s\" is not valid for the "
+                                               "\"Protocol\" option. Use "
+                                               "either \"UDP\" or \"TCP\".",
+                                               tmp);
                } else if (strcasecmp ("StoreRates", child->key) == 0) {
                        status = cf_util_get_boolean (child, &host->store_rates);
                        if (status != 0)