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