src/zookeeper.c

   1 /**
   2  * collectd - src/zookeeper.c
   3  * Copyright (C) 2014       Google, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *   Jeremy Katz <jeremy at katzbox.net>
  25  **/
  26
  27 #include "collectd.h"
  28
  29 #include "common.h"
  30 #include "plugin.h"
  31
  32 #include <netdb.h>
  33 #include <sys/un.h>
  34 #include <netinet/in.h>
  35 #include <netinet/tcp.h>
  36
  37 #define ZOOKEEPER_DEF_HOST "127.0.0.1"
  38 #define ZOOKEEPER_DEF_PORT "2181"
  39
  40 static char *zk_host = NULL;
  41 static char *zk_port = NULL;
  42
  43 static const char *config_keys[] =
  44 {
  45         "Host",
  46         "Port"
  47 };
  48 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
  49
  50 static int zookeeper_config(const char *key, const char *value)
  51 {
  52         if (strncmp(key, "Host", strlen("Host")) == 0)
  53         {
  54                 sfree (zk_host);
  55                 zk_host = strdup (value);
  56         }
  57         else if (strncmp(key, "Port", strlen("Port")) == 0)
  58         {
  59                 sfree (zk_port);
  60                 zk_port = strdup (value);
  61         }
  62         else
  63         {
  64                 return -1;
  65         }
  66         return 0;
  67 }
  68
  69 static void zookeeper_submit_gauge (const char * type, const char * type_inst, gauge_t val)
  70 {
  71         value_t values[1];
  72         value_list_t vl = VALUE_LIST_INIT;
  73
  74         values[0].gauge = val;
  75
  76         vl.values = values;
  77         vl.values_len = 1;
  78         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
  79         sstrncpy (vl.plugin, "zookeeper", sizeof (vl.plugin));
  80         sstrncpy (vl.type, type, sizeof (vl.type));
  81         if (type_inst != NULL)
  82                 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
  83
  84         plugin_dispatch_values (&vl);
  85 } /* zookeeper_submit_gauge */
  86
  87 static void zookeeper_submit_derive (const char * type, const char * type_inst, derive_t val)
  88 {
  89         value_t values[1];
  90         value_list_t vl = VALUE_LIST_INIT;
  91
  92         values[0].derive = val;
  93
  94         vl.values = values;
  95         vl.values_len = 1;
  96         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
  97         sstrncpy (vl.plugin, "zookeeper", sizeof (vl.plugin));
  98         sstrncpy (vl.type, type, sizeof (vl.type));
  99         if (type_inst != NULL)
 100                 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
 101
 102         plugin_dispatch_values (&vl);
 103 } /* zookeeper_submit_derive */
 104
 105 static int zookeeper_connect (void)
 106 {
 107         int sk = -1;
 108         int status;
 109         struct addrinfo *ai_list;
 110         const char *host;
 111         const char *port;
 112
 113         host = (zk_host != NULL) ? zk_host : ZOOKEEPER_DEF_HOST;
 114         port = (zk_port != NULL) ? zk_port : ZOOKEEPER_DEF_PORT;
 115
 116         struct addrinfo ai_hints = {
 117                 .ai_family   = AF_UNSPEC,
 118                 .ai_socktype = SOCK_STREAM
 119         };
 120
 121         status = getaddrinfo (host, port, &ai_hints, &ai_list);
 122         if (status != 0)
 123         {
 124                 char errbuf[1024];
 125                 INFO ("getaddrinfo failed: %s",
 126                           (status == EAI_SYSTEM)
 127                           ? sstrerror (errno, errbuf, sizeof (errbuf))
 128                           : gai_strerror (status));
 129                 return (-1);
 130         }
 131
 132         for (struct addrinfo *ai = ai_list; ai != NULL; ai = ai->ai_next)
 133         {
 134                 sk = socket (ai->ai_family, SOCK_STREAM, 0);
 135                 if (sk < 0)
 136                 {
 137                         char errbuf[1024];
 138                         WARNING ("zookeeper: socket(2) failed: %s",
 139                                          sstrerror (errno, errbuf, sizeof(errbuf)));
 140                         continue;
 141                 }
 142                 status = (int) connect (sk, ai->ai_addr, ai->ai_addrlen);
 143                 if (status != 0)
 144                 {
 145                         char errbuf[1024];
 146                         close (sk);
 147                         sk = -1;
 148                         WARNING ("zookeeper: connect(2) failed: %s",
 149                                          sstrerror (errno, errbuf, sizeof(errbuf)));
 150                         continue;
 151                 }
 152
 153                 /* connected */
 154                 break;
 155         }
 156
 157         freeaddrinfo(ai_list);
 158         return (sk);
 159 } /* int zookeeper_connect */
 160
 161 static int zookeeper_query (char *buffer, size_t buffer_size)
 162 {
 163         int sk, status;
 164         size_t buffer_fill;
 165
 166         sk = zookeeper_connect();
 167         if (sk < 0)
 168         {
 169                 ERROR ("zookeeper: Could not connect to daemon");
 170                 return (-1);
 171         }
 172
 173         status = (int) swrite (sk, "mntr\r\n", strlen("mntr\r\n"));
 174         if (status != 0)
 175         {
 176                 char errbuf[1024];
 177                 ERROR ("zookeeper: write(2) failed: %s",
 178                            sstrerror (errno, errbuf, sizeof (errbuf)));
 179                 close (sk);
 180                 return (-1);
 181         }
 182
 183         memset (buffer, 0, buffer_size);
 184         buffer_fill = 0;
 185
 186         while ((status = (int) recv (sk, buffer + buffer_fill,
 187           buffer_size - buffer_fill, /* flags = */ 0)) != 0)
 188         {
 189                 if (status < 0)
 190                 {
 191                         char errbuf[1024];
 192                         if ((errno == EAGAIN) || (errno == EINTR))
 193                                 continue;
 194                         ERROR ("zookeeper: Error reading from socket: %s",
 195                                    sstrerror (errno, errbuf, sizeof (errbuf)));
 196                         close (sk);
 197                         return (-1);
 198                 }
 199
 200                 buffer_fill += (size_t) status;
 201         } /* while (recv) */
 202
 203         status = 0;
 204         if (buffer_fill == 0)
 205         {
 206                 WARNING ("zookeeper: No data returned by MNTR command.");
 207                 status = -1;
 208         }
 209
 210         close(sk);
 211         return (status);
 212 } /* int zookeeper_query */
 213
 214
 215 static int zookeeper_read (void) {
 216         char buf[4096];
 217         char *ptr;
 218         char *save_ptr;
 219         char *line;
 220         char *fields[2];
 221
 222         if (zookeeper_query (buf, sizeof (buf)) < 0)
 223         {
 224                 return (-1);
 225         }
 226
 227         ptr = buf;
 228         save_ptr = NULL;
 229         while ((line = strtok_r (ptr, "\n\r", &save_ptr)) != NULL)
 230         {
 231                 ptr = NULL;
 232                 if (strsplit(line, fields, 2) != 2)
 233                 {
 234                         continue;
 235                 }
 236 #define FIELD_CHECK(check, expected) \
 237         (strncmp (check, expected, strlen(expected)) == 0)
 238
 239                 if (FIELD_CHECK (fields[0], "zk_avg_latency"))
 240                 {
 241                         zookeeper_submit_gauge ("latency", "avg", atol(fields[1]));
 242                 }
 243                 else if (FIELD_CHECK(fields[0], "zk_min_latency"))
 244                 {
 245                         zookeeper_submit_gauge ("latency", "min", atol(fields[1]));
 246                 }
 247                 else if (FIELD_CHECK (fields[0], "zk_max_latency"))
 248                 {
 249                         zookeeper_submit_gauge ("latency", "max", atol(fields[1]));
 250                 }
 251                 else if (FIELD_CHECK (fields[0], "zk_packets_received"))
 252                 {
 253                         zookeeper_submit_derive ("packets", "received", atol(fields[1]));
 254                 }
 255                 else if (FIELD_CHECK (fields[0], "zk_packets_sent"))
 256                 {
 257                         zookeeper_submit_derive ("packets", "sent", atol(fields[1]));
 258                 }
 259                 else if (FIELD_CHECK (fields[0], "zk_num_alive_connections"))
 260                 {
 261                         zookeeper_submit_gauge ("current_connections", NULL, atol(fields[1]));
 262                 }
 263                 else if (FIELD_CHECK (fields[0], "zk_outstanding_requests"))
 264                 {
 265                         zookeeper_submit_gauge ("requests", "outstanding", atol(fields[1]));
 266                 }
 267                 else if (FIELD_CHECK (fields[0], "zk_znode_count"))
 268                 {
 269                         zookeeper_submit_gauge ("gauge", "znode", atol(fields[1]));
 270                 }
 271                 else if (FIELD_CHECK (fields[0], "zk_watch_count"))
 272                 {
 273                         zookeeper_submit_gauge ("gauge", "watch", atol(fields[1]));
 274                 }
 275                 else if (FIELD_CHECK (fields[0], "zk_ephemerals_count"))
 276                 {
 277                         zookeeper_submit_gauge ("gauge", "ephemerals", atol(fields[1]));
 278                 }
 279                 else if (FIELD_CHECK (fields[0], "zk_ephemerals_count"))
 280                 {
 281                         zookeeper_submit_gauge ("gauge", "ephemerals", atol(fields[1]));
 282                 }
 283                 else if (FIELD_CHECK (fields[0], "zk_ephemerals_count"))
 284                 {
 285                         zookeeper_submit_gauge ("gauge", "ephemerals", atol(fields[1]));
 286                 }
 287                 else if (FIELD_CHECK (fields[0], "zk_approximate_data_size"))
 288                 {
 289                         zookeeper_submit_gauge ("bytes", "approximate_data_size", atol(fields[1]));
 290                 }
 291                 else if (FIELD_CHECK (fields[0], "zk_followers"))
 292                 {
 293                         zookeeper_submit_gauge ("count", "followers", atol(fields[1]));
 294                 }
 295                 else if (FIELD_CHECK (fields[0], "zk_synced_followers"))
 296                 {
 297                         zookeeper_submit_gauge ("count", "synced_followers", atol(fields[1]));
 298                 }
 299                 else if (FIELD_CHECK (fields[0], "zk_pending_syncs"))
 300                 {
 301                         zookeeper_submit_gauge ("count", "pending_syncs", atol(fields[1]));
 302                 }
 303                 else
 304                 {
 305                         DEBUG("Uncollected zookeeper MNTR field %s", fields[0]);
 306                 }
 307         }
 308
 309         return (0);
 310 } /* zookeeper_read */
 311
 312 void module_register (void)
 313 {
 314         plugin_register_config ("zookeeper", zookeeper_config, config_keys, config_keys_num);
 315         plugin_register_read ("zookeeper", zookeeper_read);
 316 } /* void module_register */