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.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));
80 plugin_dispatch_values (&vl);
81 } /* zookeeper_submit_gauge */
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;
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));
94 plugin_dispatch_values (&vl);
95 } /* zookeeper_submit_derive */
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;
105 host = (zk_host != NULL) ? zk_host : ZOOKEEPER_DEF_HOST;
106 port = (zk_port != NULL) ? zk_port : ZOOKEEPER_DEF_PORT;
108 struct addrinfo ai_hints = {
109 .ai_family = AF_UNSPEC,
110 .ai_socktype = SOCK_STREAM
111 };
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 }
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 }
145 /* connected */
146 break;
147 }
149 freeaddrinfo(ai_list);
150 return (sk);
151 } /* int zookeeper_connect */
153 static int zookeeper_query (char *buffer, size_t buffer_size)
154 {
155 int sk, status;
156 size_t buffer_fill;
158 sk = zookeeper_connect();
159 if (sk < 0)
160 {
161 ERROR ("zookeeper: Could not connect to daemon");
162 return (-1);
163 }
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 }
175 memset (buffer, 0, buffer_size);
176 buffer_fill = 0;
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 }
192 buffer_fill += (size_t) status;
193 } /* while (recv) */
195 status = 0;
196 if (buffer_fill == 0)
197 {
198 WARNING ("zookeeper: No data returned by MNTR command.");
199 status = -1;
200 }
202 close(sk);
203 return (status);
204 } /* int zookeeper_query */
207 static int zookeeper_read (void) {
208 char buf[4096];
209 char *ptr;
210 char *save_ptr;
211 char *line;
212 char *fields[2];
214 if (zookeeper_query (buf, sizeof (buf)) < 0)
215 {
216 return (-1);
217 }
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)
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 }
301 return (0);
302 } /* zookeeper_read */
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 */