1 /*
2 * SysDB - src/frontend/query.c
3 * Copyright (C) 2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
28 #include "sysdb.h"
30 #include "core/store.h"
31 #include "frontend/connection-private.h"
32 #include "utils/error.h"
33 #include "utils/strbuf.h"
35 #include <errno.h>
37 /*
38 * private helper functions
39 */
41 typedef struct {
42 sdb_strbuf_t *buf;
43 sdb_store_matcher_t *filter;
45 size_t last_len;
46 } tojson_data_t;
48 static int
49 lookup_tojson(sdb_store_obj_t *obj, void *user_data)
50 {
51 tojson_data_t *data = user_data;
52 int status;
54 if (data->filter && (! sdb_store_matcher_matches(data->filter, obj, NULL)))
55 return 0;
57 if (sdb_strbuf_len(data->buf) > data->last_len)
58 sdb_strbuf_append(data->buf, ",");
59 data->last_len = sdb_strbuf_len(data->buf);
60 status = sdb_store_host_tojson(obj, data->buf,
61 data->filter, /* flags = */ 0);
62 return status;
63 } /* lookup_tojson */
65 /*
66 * public API
67 */
69 int
70 sdb_fe_exec(sdb_conn_t *conn, sdb_conn_node_t *node)
71 {
72 if (! node)
73 return -1;
75 switch (node->cmd) {
76 case CONNECTION_FETCH:
77 return sdb_fe_fetch(conn, CONN_FETCH(node)->name,
78 /* filter = */ NULL);
79 case CONNECTION_LIST:
80 return sdb_fe_list(conn, /* filter = */ NULL);
81 case CONNECTION_LOOKUP:
82 return sdb_fe_lookup(conn, CONN_LOOKUP(node)->matcher->matcher,
83 /* filter = */ NULL);
85 default:
86 sdb_log(SDB_LOG_ERR, "frontend: Unknown command %i", node->cmd);
87 return -1;
88 }
89 return -1;
90 } /* sdb_fe_exec */
92 int
93 sdb_fe_fetch(sdb_conn_t *conn, const char *name, sdb_store_matcher_t *filter)
94 {
95 sdb_strbuf_t *buf;
96 sdb_store_obj_t *host;
98 host = sdb_store_get_host(name);
99 if (! host) {
100 sdb_log(SDB_LOG_DEBUG, "frontend: Failed to fetch host '%s': "
101 "not found", name);
103 sdb_strbuf_sprintf(conn->errbuf, "Host %s not found", name);
104 return -1;
105 }
107 buf = sdb_strbuf_create(1024);
108 if (! buf) {
109 char errbuf[1024];
110 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
111 "buffer to handle FETCH command: %s",
112 sdb_strerror(errno, errbuf, sizeof(errbuf)));
114 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
115 sdb_strbuf_destroy(buf);
116 sdb_object_deref(SDB_OBJ(host));
117 return -1;
118 }
120 if (sdb_store_host_tojson(host, buf, filter, /* flags = */ 0)) {
121 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
122 "host '%s' to JSON", name);
123 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
124 sdb_strbuf_destroy(buf);
125 sdb_object_deref(SDB_OBJ(host));
126 return -1;
127 }
129 sdb_connection_send(conn, CONNECTION_OK,
130 (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
131 sdb_strbuf_destroy(buf);
132 sdb_object_deref(SDB_OBJ(host));
133 return 0;
134 } /* sdb_fe_fetch */
136 int
137 sdb_fe_list(sdb_conn_t *conn, sdb_store_matcher_t *filter)
138 {
139 sdb_strbuf_t *buf;
141 buf = sdb_strbuf_create(1024);
142 if (! buf) {
143 char errbuf[1024];
144 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
145 "buffer to handle LIST command: %s",
146 sdb_strerror(errno, errbuf, sizeof(errbuf)));
148 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
149 sdb_strbuf_destroy(buf);
150 return -1;
151 }
153 if (sdb_store_tojson(buf, filter, /* flags = */ SDB_SKIP_ALL)) {
154 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
155 "store to JSON");
156 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
157 sdb_strbuf_destroy(buf);
158 return -1;
159 }
161 sdb_connection_send(conn, CONNECTION_OK,
162 (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
163 sdb_strbuf_destroy(buf);
164 return 0;
165 } /* sdb_fe_list */
167 int
168 sdb_fe_lookup(sdb_conn_t *conn, sdb_store_matcher_t *m,
169 sdb_store_matcher_t *filter)
170 {
171 tojson_data_t data = { NULL, filter, 0 };
173 data.buf = sdb_strbuf_create(1024);
174 if (! data.buf) {
175 char errbuf[1024];
176 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
177 "buffer to handle LOOKUP command: %s",
178 sdb_strerror(errno, errbuf, sizeof(errbuf)));
180 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
181 sdb_strbuf_destroy(data.buf);
182 return -1;
183 }
185 sdb_strbuf_append(data.buf, "[");
187 /* Let the JSON serializer handle the filter instead of the scanner. Else,
188 * we'd have to filter twice -- once in the scanner and then again in the
189 * serializer. */
190 data.last_len = sdb_strbuf_len(data.buf);
191 if (sdb_store_scan(m, /* filter */ NULL, lookup_tojson, &data)) {
192 sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup hosts");
193 sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup hosts");
194 sdb_strbuf_destroy(data.buf);
195 return -1;
196 }
198 sdb_strbuf_append(data.buf, "]");
200 sdb_connection_send(conn, CONNECTION_OK,
201 (uint32_t)sdb_strbuf_len(data.buf), sdb_strbuf_string(data.buf));
202 sdb_strbuf_destroy(data.buf);
203 return 0;
204 } /* sdb_fe_lookup */
206 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */