7e551918d2303b5fa68d759a63cc981e4ef20f86
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 value)
70 {
71 value_list_t vl = VALUE_LIST_INIT;
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));
81 plugin_dispatch_values (&vl);
82 } /* zookeeper_submit_gauge */
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;
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));
96 plugin_dispatch_values (&vl);
97 } /* zookeeper_submit_derive */
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;
107 host = (zk_host != NULL) ? zk_host : ZOOKEEPER_DEF_HOST;
108 port = (zk_port != NULL) ? zk_port : ZOOKEEPER_DEF_PORT;
110 struct addrinfo ai_hints = {
111 .ai_family = AF_UNSPEC,
112 .ai_socktype = SOCK_STREAM
113 };
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 }
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 }
147 /* connected */
148 break;
149 }
151 freeaddrinfo(ai_list);
152 return (sk);
153 } /* int zookeeper_connect */
155 static int zookeeper_query (char *buffer, size_t buffer_size)
156 {
157 int sk, status;
158 size_t buffer_fill;
160 sk = zookeeper_connect();
161 if (sk < 0)
162 {
163 ERROR ("zookeeper: Could not connect to daemon");
164 return (-1);
165 }
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 }
177 memset (buffer, 0, buffer_size);
178 buffer_fill = 0;
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 }
194 buffer_fill += (size_t) status;
195 } /* while (recv) */
197 status = 0;
198 if (buffer_fill == 0)
199 {
200 WARNING ("zookeeper: No data returned by MNTR command.");
201 status = -1;
202 }
204 close(sk);
205 return (status);
206 } /* int zookeeper_query */
209 static int zookeeper_read (void) {
210 char buf[4096];
211 char *ptr;
212 char *save_ptr;
213 char *line;
214 char *fields[2];
216 if (zookeeper_query (buf, sizeof (buf)) < 0)
217 {
218 return (-1);
219 }
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)
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 }
303 return (0);
304 } /* zookeeper_read */
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 */