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 #include "common.h"
  29 #include "plugin.h"
  30
  31 #include <netdb.h>
  32 #include <sys/un.h>
  33 #include <netinet/in.h>
  34 #include <netinet/tcp.h>
  35
  36 #define ZOOKEEPER_DEF_HOST "127.0.0.1"
  37 #define ZOOKEEPER_DEF_PORT "2181"
  38
  39 static char *zk_host = NULL;
  40 static char *zk_port = NULL;
  41
  42 static const char *config_keys[] =
  43 {
  44         "Host",
  45         "Port"
  46 };
  47 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
  48
  49 static int zookeeper_config(const char *key, const char *value)
  50 {
  51         if (strncmp(key, "Host", strlen("Host")) == 0)
  52         {
  53                 sfree (zk_host);
  54                 zk_host = strdup (value);
  55         }
  56         else if (strncmp(key, "Port", strlen("Port")) == 0)
  57         {
  58                 sfree (zk_port);
  59                 zk_port = strdup (value);
  60         }
  61         else
  62         {
  63                 return -1;
  64         }
  65         return 0;
  66 }
  67
  68 static void zookeeper_submit_gauge (const char * type, const char * type_inst, gauge_t val)
  69 {
  70         value_t values[1];
  71         value_list_t vl = VALUE_LIST_INIT;
  72
  73         values[0].gauge = val;
  74
  75         vl.values = values;
  76         vl.values_len = 1;
  77         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
  78         sstrncpy (vl.plugin, "zookeeper", sizeof (vl.plugin));
  79         sstrncpy (vl.type, type, sizeof (vl.type));
  80         if (type_inst != NULL)
  81                 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
  82
  83         plugin_dispatch_values (&vl);
  84 } /* zookeeper_submit_gauge */
  85
  86 static void zookeeper_submit_derive (const char * type, const char * type_inst, derive_t val)
  87 {
  88         value_t values[1];
  89         value_list_t vl = VALUE_LIST_INIT;
  90
  91         values[0].derive = val;
  92
  93         vl.values = values;
  94         vl.values_len = 1;
  95         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
  96         sstrncpy (vl.plugin, "zookeeper", sizeof (vl.plugin));
  97         sstrncpy (vl.type, type, sizeof (vl.type));
  98         if (type_inst != NULL)
  99                 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
 100
 101         plugin_dispatch_values (&vl);
 102 } /* zookeeper_submit_derive */
 103
 104 static int zookeeper_connect (void)
 105 {
 106         int sk = -1;
 107         int status;
 108         struct addrinfo ai_hints = { 0 };
 109         struct addrinfo *ai;
 110         struct addrinfo *ai_list;
 111         const char *host;
 112         const char *port;
 113
 114         ai_hints.ai_family   = AF_UNSPEC;
 115         ai_hints.ai_socktype = SOCK_STREAM;
 116
 117         host = (zk_host != NULL) ? zk_host : ZOOKEEPER_DEF_HOST;
 118         port = (zk_port != NULL) ? zk_port : ZOOKEEPER_DEF_PORT;
 119         status = getaddrinfo (host, port, &ai_hints, &ai_list);
 120         if (status != 0)
 121         {
 122                 char errbuf[1024];
 123                 INFO ("getaddrinfo failed: %s",
 124                           (status == EAI_SYSTEM)
 125                           ? sstrerror (errno, errbuf, sizeof (errbuf))
 126                           : gai_strerror (status));
 127                 return (-1);
 128         }
 129
 130         for (ai = ai_list; ai != NULL; ai = ai->ai_next)
 131         {
 132                 sk = socket (ai->ai_family, SOCK_STREAM, 0);
 133                 if (sk < 0)
 134                 {
 135                         char errbuf[1024];
 136                         WARNING ("zookeeper: socket(2) failed: %s",
 137                                          sstrerror (errno, errbuf, sizeof(errbuf)));
 138                         continue;
 139                 }
 140                 status = (int) connect (sk, ai->ai_addr, ai->ai_addrlen);
 141                 if (status != 0)
 142                 {
 143                         char errbuf[1024];
 144                         close (sk);
 145                         sk = -1;
 146                         WARNING ("zookeeper: connect(2) failed: %s",
 147                                          sstrerror (errno, errbuf, sizeof(errbuf)));
 148                         continue;
 149                 }
 150
 151                 /* connected */
 152                 break;
 153         }
 154
 155         freeaddrinfo(ai_list);
 156         return (sk);
 157 } /* int zookeeper_connect */
 158
 159 static int zookeeper_query (char *buffer, size_t buffer_size)
 160 {
 161         int sk, status;
 162         size_t buffer_fill;
 163
 164         sk = zookeeper_connect();
 165         if (sk < 0)
 166         {
 167                 ERROR ("zookeeper: Could not connect to daemon");
 168                 return (-1);
 169         }
 170
 171         status = (int) swrite (sk, "mntr\r\n", strlen("mntr\r\n"));
 172         if (status != 0)
 173         {
 174                 char errbuf[1024];
 175                 ERROR ("zookeeper: write(2) failed: %s",
 176                            sstrerror (errno, errbuf, sizeof (errbuf)));
 177                 close (sk);
 178                 return (-1);
 179         }
 180
 181         memset (buffer, 0, buffer_size);
 182         buffer_fill = 0;
 183
 184         while ((status = (int) recv (sk, buffer + buffer_fill,
 185           buffer_size - buffer_fill, /* flags = */ 0)) != 0)
 186         {
 187                 if (status < 0)
 188                 {
 189                         char errbuf[1024];
 190                         if ((errno == EAGAIN) || (errno == EINTR))
 191                                 continue;
 192                         ERROR ("zookeeper: Error reading from socket: %s",
 193                                    sstrerror (errno, errbuf, sizeof (errbuf)));
 194                         close (sk);
 195                         return (-1);
 196                 }
 197
 198                 buffer_fill += (size_t) status;
 199         } /* while (recv) */
 200
 201         status = 0;
 202         if (buffer_fill == 0)
 203         {
 204                 WARNING ("zookeeper: No data returned by MNTR command.");
 205                 status = -1;
 206         }
 207
 208         close(sk);
 209         return (status);
 210 } /* int zookeeper_query */
 211
 212
 213 static int zookeeper_read (void) {
 214         char buf[4096];
 215         char *ptr;
 216         char *save_ptr;
 217         char *line;
 218         char *fields[2];
 219
 220         if (zookeeper_query (buf, sizeof (buf)) < 0)
 221         {
 222                 return (-1);
 223         }
 224
 225         ptr = buf;
 226         save_ptr = NULL;
 227         while ((line = strtok_r (ptr, "\n\r", &save_ptr)) != NULL)
 228         {
 229                 ptr = NULL;
 230                 if (strsplit(line, fields, 2) != 2)
 231                 {
 232                         continue;
 233                 }
 234 #define FIELD_CHECK(check, expected) \
 235         (strncmp (check, expected, strlen(expected)) == 0)
 236
 237                 if (FIELD_CHECK (fields[0], "zk_avg_latency"))
 238                 {
 239                         zookeeper_submit_gauge ("latency", "avg", atol(fields[1]));
 240                 }
 241                 else if (FIELD_CHECK(fields[0], "zk_min_latency"))
 242                 {
 243                         zookeeper_submit_gauge ("latency", "min", atol(fields[1]));
 244                 }
 245                 else if (FIELD_CHECK (fields[0], "zk_max_latency"))
 246                 {
 247                         zookeeper_submit_gauge ("latency", "max", atol(fields[1]));
 248                 }
 249                 else if (FIELD_CHECK (fields[0], "zk_packets_received"))
 250                 {
 251                         zookeeper_submit_derive ("packets", "received", atol(fields[1]));
 252                 }
 253                 else if (FIELD_CHECK (fields[0], "zk_packets_sent"))
 254                 {
 255                         zookeeper_submit_derive ("packets", "sent", atol(fields[1]));
 256                 }
 257                 else if (FIELD_CHECK (fields[0], "zk_num_alive_connections"))
 258                 {
 259                         zookeeper_submit_gauge ("current_connections", NULL, atol(fields[1]));
 260                 }
 261                 else if (FIELD_CHECK (fields[0], "zk_outstanding_requests"))
 262                 {
 263                         zookeeper_submit_gauge ("requests", "outstanding", atol(fields[1]));
 264                 }
 265                 else if (FIELD_CHECK (fields[0], "zk_znode_count"))
 266                 {
 267                         zookeeper_submit_gauge ("gauge", "znode", atol(fields[1]));
 268                 }
 269                 else if (FIELD_CHECK (fields[0], "zk_watch_count"))
 270                 {
 271                         zookeeper_submit_gauge ("gauge", "watch", 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_ephemerals_count"))
 282                 {
 283                         zookeeper_submit_gauge ("gauge", "ephemerals", atol(fields[1]));
 284                 }
 285                 else if (FIELD_CHECK (fields[0], "zk_approximate_data_size"))
 286                 {
 287                         zookeeper_submit_gauge ("bytes", "approximate_data_size", atol(fields[1]));
 288                 }
 289                 else if (FIELD_CHECK (fields[0], "zk_followers"))
 290                 {
 291                         zookeeper_submit_gauge ("count", "followers", atol(fields[1]));
 292                 }
 293                 else if (FIELD_CHECK (fields[0], "zk_synced_followers"))
 294                 {
 295                         zookeeper_submit_gauge ("count", "synced_followers", atol(fields[1]));
 296                 }
 297                 else if (FIELD_CHECK (fields[0], "zk_pending_syncs"))
 298                 {
 299                         zookeeper_submit_gauge ("count", "pending_syncs", atol(fields[1]));
 300                 }
 301                 else
 302                 {
 303                         DEBUG("Uncollected zookeeper MNTR field %s", fields[0]);
 304                 }
 305         }
 306
 307         return (0);
 308 } /* zookeeper_read */
 309
 310 void module_register (void)
 311 {
 312         plugin_register_config ("zookeeper", zookeeper_config, config_keys, config_keys_num);
 313         plugin_register_read ("zookeeper", zookeeper_read);
 314 } /* void module_register */