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 value)
  70 {
  71         value_list_t vl = VALUE_LIST_INIT;
  72
  73         vl.values = &(value_t) { .gauge = value };
  74         vl.values_len = 1;
  75         sstrncpy (vl.plugin, "zookeeper", sizeof (vl.plugin));
  76         sstrncpy (vl.type, type, sizeof (vl.type));
  77         if (type_inst != NULL)
  78                 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
  79
  80         plugin_dispatch_values (&vl);
  81 } /* zookeeper_submit_gauge */
  82
  83 static void zookeeper_submit_derive (const char * type, const char * type_inst, derive_t value)
  84 {
  85         value_list_t vl = VALUE_LIST_INIT;
  86
  87         vl.values = &(value_t) { .derive = value };
  88         vl.values_len = 1;
  89         sstrncpy (vl.plugin, "zookeeper", sizeof (vl.plugin));
  90         sstrncpy (vl.type, type, sizeof (vl.type));
  91         if (type_inst != NULL)
  92                 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
  93
  94         plugin_dispatch_values (&vl);
  95 } /* zookeeper_submit_derive */
  96
  97 static int zookeeper_connect (void)
  98 {
  99         int sk = -1;
 100         int status;
 101         struct addrinfo *ai_list;
 102         const char *host;
 103         const char *port;
 104
 105         host = (zk_host != NULL) ? zk_host : ZOOKEEPER_DEF_HOST;
 106         port = (zk_port != NULL) ? zk_port : ZOOKEEPER_DEF_PORT;
 107
 108         struct addrinfo ai_hints = {
 109                 .ai_family   = AF_UNSPEC,
 110                 .ai_socktype = SOCK_STREAM
 111         };
 112
 113         status = getaddrinfo (host, port, &ai_hints, &ai_list);
 114         if (status != 0)
 115         {
 116                 char errbuf[1024];
 117                 INFO ("getaddrinfo failed: %s",
 118                           (status == EAI_SYSTEM)
 119                           ? sstrerror (errno, errbuf, sizeof (errbuf))
 120                           : gai_strerror (status));
 121                 return (-1);
 122         }
 123
 124         for (struct addrinfo *ai = ai_list; ai != NULL; ai = ai->ai_next)
 125         {
 126                 sk = socket (ai->ai_family, SOCK_STREAM, 0);
 127                 if (sk < 0)
 128                 {
 129                         char errbuf[1024];
 130                         WARNING ("zookeeper: socket(2) failed: %s",
 131                                          sstrerror (errno, errbuf, sizeof(errbuf)));
 132                         continue;
 133                 }
 134                 status = (int) connect (sk, ai->ai_addr, ai->ai_addrlen);
 135                 if (status != 0)
 136                 {
 137                         char errbuf[1024];
 138                         close (sk);
 139                         sk = -1;
 140                         WARNING ("zookeeper: connect(2) failed: %s",
 141                                          sstrerror (errno, errbuf, sizeof(errbuf)));
 142                         continue;
 143                 }
 144
 145                 /* connected */
 146                 break;
 147         }
 148
 149         freeaddrinfo(ai_list);
 150         return (sk);
 151 } /* int zookeeper_connect */
 152
 153 static int zookeeper_query (char *buffer, size_t buffer_size)
 154 {
 155         int sk, status;
 156         size_t buffer_fill;
 157
 158         sk = zookeeper_connect();
 159         if (sk < 0)
 160         {
 161                 ERROR ("zookeeper: Could not connect to daemon");
 162                 return (-1);
 163         }
 164
 165         status = (int) swrite (sk, "mntr\r\n", strlen("mntr\r\n"));
 166         if (status != 0)
 167         {
 168                 char errbuf[1024];
 169                 ERROR ("zookeeper: write(2) failed: %s",
 170                            sstrerror (errno, errbuf, sizeof (errbuf)));
 171                 close (sk);
 172                 return (-1);
 173         }
 174
 175         memset (buffer, 0, buffer_size);
 176         buffer_fill = 0;
 177
 178         while ((status = (int) recv (sk, buffer + buffer_fill,
 179           buffer_size - buffer_fill, /* flags = */ 0)) != 0)
 180         {
 181                 if (status < 0)
 182                 {
 183                         char errbuf[1024];
 184                         if ((errno == EAGAIN) || (errno == EINTR))
 185                                 continue;
 186                         ERROR ("zookeeper: Error reading from socket: %s",
 187                                    sstrerror (errno, errbuf, sizeof (errbuf)));
 188                         close (sk);
 189                         return (-1);
 190                 }
 191
 192                 buffer_fill += (size_t) status;
 193         } /* while (recv) */
 194
 195         status = 0;
 196         if (buffer_fill == 0)
 197         {
 198                 WARNING ("zookeeper: No data returned by MNTR command.");
 199                 status = -1;
 200         }
 201
 202         close(sk);
 203         return (status);
 204 } /* int zookeeper_query */
 205
 206
 207 static int zookeeper_read (void) {
 208         char buf[4096];
 209         char *ptr;
 210         char *save_ptr;
 211         char *line;
 212         char *fields[2];
 213
 214         if (zookeeper_query (buf, sizeof (buf)) < 0)
 215         {
 216                 return (-1);
 217         }
 218
 219         ptr = buf;
 220         save_ptr = NULL;
 221         while ((line = strtok_r (ptr, "\n\r", &save_ptr)) != NULL)
 222         {
 223                 ptr = NULL;
 224                 if (strsplit(line, fields, 2) != 2)
 225                 {
 226                         continue;
 227                 }
 228 #define FIELD_CHECK(check, expected) \
 229         (strncmp (check, expected, strlen(expected)) == 0)
 230
 231                 if (FIELD_CHECK (fields[0], "zk_avg_latency"))
 232                 {
 233                         zookeeper_submit_gauge ("latency", "avg", atol(fields[1]));
 234                 }
 235                 else if (FIELD_CHECK(fields[0], "zk_min_latency"))
 236                 {
 237                         zookeeper_submit_gauge ("latency", "min", atol(fields[1]));
 238                 }
 239                 else if (FIELD_CHECK (fields[0], "zk_max_latency"))
 240                 {
 241                         zookeeper_submit_gauge ("latency", "max", atol(fields[1]));
 242                 }
 243                 else if (FIELD_CHECK (fields[0], "zk_packets_received"))
 244                 {
 245                         zookeeper_submit_derive ("packets", "received", atol(fields[1]));
 246                 }
 247                 else if (FIELD_CHECK (fields[0], "zk_packets_sent"))
 248                 {
 249                         zookeeper_submit_derive ("packets", "sent", atol(fields[1]));
 250                 }
 251                 else if (FIELD_CHECK (fields[0], "zk_num_alive_connections"))
 252                 {
 253                         zookeeper_submit_gauge ("current_connections", NULL, atol(fields[1]));
 254                 }
 255                 else if (FIELD_CHECK (fields[0], "zk_outstanding_requests"))
 256                 {
 257                         zookeeper_submit_gauge ("requests", "outstanding", atol(fields[1]));
 258                 }
 259                 else if (FIELD_CHECK (fields[0], "zk_znode_count"))
 260                 {
 261                         zookeeper_submit_gauge ("gauge", "znode", atol(fields[1]));
 262                 }
 263                 else if (FIELD_CHECK (fields[0], "zk_watch_count"))
 264                 {
 265                         zookeeper_submit_gauge ("gauge", "watch", atol(fields[1]));
 266                 }
 267                 else if (FIELD_CHECK (fields[0], "zk_ephemerals_count"))
 268                 {
 269                         zookeeper_submit_gauge ("gauge", "ephemerals", atol(fields[1]));
 270                 }
 271                 else if (FIELD_CHECK (fields[0], "zk_ephemerals_count"))
 272                 {
 273                         zookeeper_submit_gauge ("gauge", "ephemerals", 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_approximate_data_size"))
 280                 {
 281                         zookeeper_submit_gauge ("bytes", "approximate_data_size", atol(fields[1]));
 282                 }
 283                 else if (FIELD_CHECK (fields[0], "zk_followers"))
 284                 {
 285                         zookeeper_submit_gauge ("count", "followers", atol(fields[1]));
 286                 }
 287                 else if (FIELD_CHECK (fields[0], "zk_synced_followers"))
 288                 {
 289                         zookeeper_submit_gauge ("count", "synced_followers", atol(fields[1]));
 290                 }
 291                 else if (FIELD_CHECK (fields[0], "zk_pending_syncs"))
 292                 {
 293                         zookeeper_submit_gauge ("count", "pending_syncs", atol(fields[1]));
 294                 }
 295                 else
 296                 {
 297                         DEBUG("Uncollected zookeeper MNTR field %s", fields[0]);
 298                 }
 299         }
 300
 301         return (0);
 302 } /* zookeeper_read */
 303
 304 void module_register (void)
 305 {
 306         plugin_register_config ("zookeeper", zookeeper_config, config_keys, config_keys_num);
 307         plugin_register_read ("zookeeper", zookeeper_read);
 308 } /* void module_register */