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 **/
27 #include "collectd.h"
29 #include "common.h"
30 #include "plugin.h"
32 #include <netdb.h>
33 #include <sys/un.h>
34 #include <netinet/in.h>
35 #include <netinet/tcp.h>
37 #define ZOOKEEPER_DEF_HOST "127.0.0.1"
38 #define ZOOKEEPER_DEF_PORT "2181"
40 static char *zk_host = NULL;
41 static char *zk_port = NULL;
43 static const char *config_keys[] =
44 {
45 "Host",
46 "Port"
47 };
48 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
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 }
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;
74 values[0].gauge = val;
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));
84 plugin_dispatch_values (&vl);
85 } /* zookeeper_submit_gauge */
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;
92 values[0].derive = val;
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));
102 plugin_dispatch_values (&vl);
103 } /* zookeeper_submit_derive */
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;
113 host = (zk_host != NULL) ? zk_host : ZOOKEEPER_DEF_HOST;
114 port = (zk_port != NULL) ? zk_port : ZOOKEEPER_DEF_PORT;
116 struct addrinfo ai_hints = {
117 .ai_family = AF_UNSPEC,
118 .ai_socktype = SOCK_STREAM
119 };
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 }
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 }
153 /* connected */
154 break;
155 }
157 freeaddrinfo(ai_list);
158 return (sk);
159 } /* int zookeeper_connect */
161 static int zookeeper_query (char *buffer, size_t buffer_size)
162 {
163 int sk, status;
164 size_t buffer_fill;
166 sk = zookeeper_connect();
167 if (sk < 0)
168 {
169 ERROR ("zookeeper: Could not connect to daemon");
170 return (-1);
171 }
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 }
183 memset (buffer, 0, buffer_size);
184 buffer_fill = 0;
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 }
200 buffer_fill += (size_t) status;
201 } /* while (recv) */
203 status = 0;
204 if (buffer_fill == 0)
205 {
206 WARNING ("zookeeper: No data returned by MNTR command.");
207 status = -1;
208 }
210 close(sk);
211 return (status);
212 } /* int zookeeper_query */
215 static int zookeeper_read (void) {
216 char buf[4096];
217 char *ptr;
218 char *save_ptr;
219 char *line;
220 char *fields[2];
222 if (zookeeper_query (buf, sizeof (buf)) < 0)
223 {
224 return (-1);
225 }
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)
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 }
309 return (0);
310 } /* zookeeper_read */
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 */