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.host, hostname_g, sizeof (vl.host));
  76         sstrncpy (vl.plugin, "zookeeper", sizeof (vl.plugin));
  77         sstrncpy (vl.type, type, sizeof (vl.type));
  78         if (type_inst != NULL)
  79                 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
  80
  81         plugin_dispatch_values (&vl);
  82 } /* zookeeper_submit_gauge */
  83
  84 static void zookeeper_submit_derive (const char * type, const char * type_inst, derive_t value)
  85 {
  86         value_list_t vl = VALUE_LIST_INIT;
  87
  88         vl.values = &(value_t) { .derive = value };
  89         vl.values_len = 1;
  90         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
  91         sstrncpy (vl.plugin, "zookeeper", sizeof (vl.plugin));
  92         sstrncpy (vl.type, type, sizeof (vl.type));
  93         if (type_inst != NULL)
  94                 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
  95
  96         plugin_dispatch_values (&vl);
  97 } /* zookeeper_submit_derive */
  98
  99 static int zookeeper_connect (void)
 100 {
 101         int sk = -1;
 102         int status;
 103         struct addrinfo *ai_list;
 104         const char *host;
 105         const char *port;
 106
 107         host = (zk_host != NULL) ? zk_host : ZOOKEEPER_DEF_HOST;
 108         port = (zk_port != NULL) ? zk_port : ZOOKEEPER_DEF_PORT;
 109
 110         struct addrinfo ai_hints = {
 111                 .ai_family   = AF_UNSPEC,
 112                 .ai_socktype = SOCK_STREAM
 113         };
 114
 115         status = getaddrinfo (host, port, &ai_hints, &ai_list);
 116         if (status != 0)
 117         {
 118                 char errbuf[1024];
 119                 INFO ("getaddrinfo failed: %s",
 120                           (status == EAI_SYSTEM)
 121                           ? sstrerror (errno, errbuf, sizeof (errbuf))
 122                           : gai_strerror (status));
 123                 return (-1);
 124         }
 125
 126         for (struct addrinfo *ai = ai_list; ai != NULL; ai = ai->ai_next)
 127         {
 128                 sk = socket (ai->ai_family, SOCK_STREAM, 0);
 129                 if (sk < 0)
 130                 {
 131                         char errbuf[1024];
 132                         WARNING ("zookeeper: socket(2) failed: %s",
 133                                          sstrerror (errno, errbuf, sizeof(errbuf)));
 134                         continue;
 135                 }
 136                 status = (int) connect (sk, ai->ai_addr, ai->ai_addrlen);
 137                 if (status != 0)
 138                 {
 139                         char errbuf[1024];
 140                         close (sk);
 141                         sk = -1;
 142                         WARNING ("zookeeper: connect(2) failed: %s",
 143                                          sstrerror (errno, errbuf, sizeof(errbuf)));
 144                         continue;
 145                 }
 146
 147                 /* connected */
 148                 break;
 149         }
 150
 151         freeaddrinfo(ai_list);
 152         return (sk);
 153 } /* int zookeeper_connect */
 154
 155 static int zookeeper_query (char *buffer, size_t buffer_size)
 156 {
 157         int sk, status;
 158         size_t buffer_fill;
 159
 160         sk = zookeeper_connect();
 161         if (sk < 0)
 162         {
 163                 ERROR ("zookeeper: Could not connect to daemon");
 164                 return (-1);
 165         }
 166
 167         status = (int) swrite (sk, "mntr\r\n", strlen("mntr\r\n"));
 168         if (status != 0)
 169         {
 170                 char errbuf[1024];
 171                 ERROR ("zookeeper: write(2) failed: %s",
 172                            sstrerror (errno, errbuf, sizeof (errbuf)));
 173                 close (sk);
 174                 return (-1);
 175         }
 176
 177         memset (buffer, 0, buffer_size);
 178         buffer_fill = 0;
 179
 180         while ((status = (int) recv (sk, buffer + buffer_fill,
 181           buffer_size - buffer_fill, /* flags = */ 0)) != 0)
 182         {
 183                 if (status < 0)
 184                 {
 185                         char errbuf[1024];
 186                         if ((errno == EAGAIN) || (errno == EINTR))
 187                                 continue;
 188                         ERROR ("zookeeper: Error reading from socket: %s",
 189                                    sstrerror (errno, errbuf, sizeof (errbuf)));
 190                         close (sk);
 191                         return (-1);
 192                 }
 193
 194                 buffer_fill += (size_t) status;
 195         } /* while (recv) */
 196
 197         status = 0;
 198         if (buffer_fill == 0)
 199         {
 200                 WARNING ("zookeeper: No data returned by MNTR command.");
 201                 status = -1;
 202         }
 203
 204         close(sk);
 205         return (status);
 206 } /* int zookeeper_query */
 207
 208
 209 static int zookeeper_read (void) {
 210         char buf[4096];
 211         char *ptr;
 212         char *save_ptr;
 213         char *line;
 214         char *fields[2];
 215
 216         if (zookeeper_query (buf, sizeof (buf)) < 0)
 217         {
 218                 return (-1);
 219         }
 220
 221         ptr = buf;
 222         save_ptr = NULL;
 223         while ((line = strtok_r (ptr, "\n\r", &save_ptr)) != NULL)
 224         {
 225                 ptr = NULL;
 226                 if (strsplit(line, fields, 2) != 2)
 227                 {
 228                         continue;
 229                 }
 230 #define FIELD_CHECK(check, expected) \
 231         (strncmp (check, expected, strlen(expected)) == 0)
 232
 233                 if (FIELD_CHECK (fields[0], "zk_avg_latency"))
 234                 {
 235                         zookeeper_submit_gauge ("latency", "avg", atol(fields[1]));
 236                 }
 237                 else if (FIELD_CHECK(fields[0], "zk_min_latency"))
 238                 {
 239                         zookeeper_submit_gauge ("latency", "min", atol(fields[1]));
 240                 }
 241                 else if (FIELD_CHECK (fields[0], "zk_max_latency"))
 242                 {
 243                         zookeeper_submit_gauge ("latency", "max", atol(fields[1]));
 244                 }
 245                 else if (FIELD_CHECK (fields[0], "zk_packets_received"))
 246                 {
 247                         zookeeper_submit_derive ("packets", "received", atol(fields[1]));
 248                 }
 249                 else if (FIELD_CHECK (fields[0], "zk_packets_sent"))
 250                 {
 251                         zookeeper_submit_derive ("packets", "sent", atol(fields[1]));
 252                 }
 253                 else if (FIELD_CHECK (fields[0], "zk_num_alive_connections"))
 254                 {
 255                         zookeeper_submit_gauge ("current_connections", NULL, atol(fields[1]));
 256                 }
 257                 else if (FIELD_CHECK (fields[0], "zk_outstanding_requests"))
 258                 {
 259                         zookeeper_submit_gauge ("requests", "outstanding", atol(fields[1]));
 260                 }
 261                 else if (FIELD_CHECK (fields[0], "zk_znode_count"))
 262                 {
 263                         zookeeper_submit_gauge ("gauge", "znode", atol(fields[1]));
 264                 }
 265                 else if (FIELD_CHECK (fields[0], "zk_watch_count"))
 266                 {
 267                         zookeeper_submit_gauge ("gauge", "watch", atol(fields[1]));
 268                 }
 269                 else if (FIELD_CHECK (fields[0], "zk_ephemerals_count"))
 270                 {
 271                         zookeeper_submit_gauge ("gauge", "ephemerals", atol(fields[1]));
 272                 }
 273                 else if (FIELD_CHECK (fields[0], "zk_ephemerals_count"))
 274                 {
 275                         zookeeper_submit_gauge ("gauge", "ephemerals", atol(fields[1]));
 276                 }
 277                 else if (FIELD_CHECK (fields[0], "zk_ephemerals_count"))
 278                 {
 279                         zookeeper_submit_gauge ("gauge", "ephemerals", atol(fields[1]));
 280                 }
 281                 else if (FIELD_CHECK (fields[0], "zk_approximate_data_size"))
 282                 {
 283                         zookeeper_submit_gauge ("bytes", "approximate_data_size", atol(fields[1]));
 284                 }
 285                 else if (FIELD_CHECK (fields[0], "zk_followers"))
 286                 {
 287                         zookeeper_submit_gauge ("count", "followers", atol(fields[1]));
 288                 }
 289                 else if (FIELD_CHECK (fields[0], "zk_synced_followers"))
 290                 {
 291                         zookeeper_submit_gauge ("count", "synced_followers", atol(fields[1]));
 292                 }
 293                 else if (FIELD_CHECK (fields[0], "zk_pending_syncs"))
 294                 {
 295                         zookeeper_submit_gauge ("count", "pending_syncs", atol(fields[1]));
 296                 }
 297                 else
 298                 {
 299                         DEBUG("Uncollected zookeeper MNTR field %s", fields[0]);
 300                 }
 301         }
 302
 303         return (0);
 304 } /* zookeeper_read */
 305
 306 void module_register (void)
 307 {
 308         plugin_register_config ("zookeeper", zookeeper_config, config_keys, config_keys_num);
 309         plugin_register_read ("zookeeper", zookeeper_read);
 310 } /* void module_register */