src/frontend/query.c

   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  */
  27
  28 #include "sysdb.h"
  29
  30 #include "core/store.h"
  31 #include "frontend/connection-private.h"
  32 #include "utils/error.h"
  33 #include "utils/strbuf.h"
  34
  35 #include <errno.h>
  36
  37 /*
  38  * private helper functions
  39  */
  40
  41 typedef struct {
  42         sdb_strbuf_t *buf;
  43         sdb_store_matcher_t *filter;
  44
  45         size_t last_len;
  46 } tojson_data_t;
  47
  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;
  53
  54         if (data->filter && (! sdb_store_matcher_matches(data->filter, obj, NULL)))
  55                 return 0;
  56
  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 */
  64
  65 /*
  66  * public API
  67  */
  68
  69 int
  70 sdb_fe_exec(sdb_conn_t *conn, sdb_conn_node_t *node)
  71 {
  72         if (! node)
  73                 return -1;
  74
  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);
  84
  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 */
  91
  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;
  97
  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);
 102
 103                 sdb_strbuf_sprintf(conn->errbuf, "Host %s not found", name);
 104                 return -1;
 105         }
 106
 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)));
 113
 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         }
 119
 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         }
 128
 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 */
 135
 136 int
 137 sdb_fe_list(sdb_conn_t *conn, sdb_store_matcher_t *filter)
 138 {
 139         sdb_strbuf_t *buf;
 140
 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)));
 147
 148                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 149                 sdb_strbuf_destroy(buf);
 150                 return -1;
 151         }
 152
 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         }
 160
 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 */
 166
 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 };
 172
 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)));
 179
 180                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 181                 sdb_strbuf_destroy(data.buf);
 182                 return -1;
 183         }
 184
 185         sdb_strbuf_append(data.buf, "[");
 186
 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         }
 197
 198         sdb_strbuf_append(data.buf, "]");
 199
 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 */
 205
 206 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 207