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"
28 #include "common.h"
29 #include "plugin.h"
31 #include <netdb.h>
32 #include <sys/un.h>
33 #include <netinet/in.h>
34 #include <netinet/tcp.h>
36 #define ZOOKEEPER_DEF_HOST "127.0.0.1"
37 #define ZOOKEEPER_DEF_PORT "2181"
39 static char *zk_host = NULL;
40 static char *zk_port = NULL;
42 static const char *config_keys[] =
43 {
44 "Host",
45 "Port"
46 };
47 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
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 }
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;
73 values[0].gauge = val;
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));
83 plugin_dispatch_values (&vl);
84 } /* zookeeper_submit_gauge */
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;
91 values[0].derive = val;
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));
101 plugin_dispatch_values (&vl);
102 } /* zookeeper_submit_derive */
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;
114 ai_hints.ai_family = AF_UNSPEC;
115 ai_hints.ai_socktype = SOCK_STREAM;
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 }
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 }
151 /* connected */
152 break;
153 }
155 freeaddrinfo(ai_list);
156 return (sk);
157 } /* int zookeeper_connect */
159 static int zookeeper_query (char *buffer, size_t buffer_size)
160 {
161 int sk, status;
162 size_t buffer_fill;
164 sk = zookeeper_connect();
165 if (sk < 0)
166 {
167 ERROR ("zookeeper: Could not connect to daemon");
168 return (-1);
169 }
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 }
181 memset (buffer, 0, buffer_size);
182 buffer_fill = 0;
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 }
198 buffer_fill += (size_t) status;
199 } /* while (recv) */
201 status = 0;
202 if (buffer_fill == 0)
203 {
204 WARNING ("zookeeper: No data returned by MNTR command.");
205 status = -1;
206 }
208 close(sk);
209 return (status);
210 } /* int zookeeper_query */
213 static int zookeeper_read (void) {
214 char buf[4096];
215 char *ptr;
216 char *save_ptr;
217 char *line;
218 char *fields[2];
220 if (zookeeper_query (buf, sizeof (buf)) < 0)
221 {
222 return (-1);
223 }
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)
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 }
307 return (0);
308 } /* zookeeper_read */
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 */