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 static int
  42 lookup_tojson(sdb_store_obj_t *obj, void *user_data)
  43 {
  44         sdb_strbuf_t *buf = user_data;
  45         if (sdb_strbuf_len(buf) > 1)
  46                 sdb_strbuf_append(buf, ",");
  47         return sdb_store_host_tojson(obj, buf,
  48                         /* filter = */ NULL, /* flags = */ 0);
  49 } /* lookup_tojson */
  50
  51 /*
  52  * public API
  53  */
  54
  55 int
  56 sdb_fe_exec(sdb_conn_t *conn, sdb_conn_node_t *node)
  57 {
  58         if (! node)
  59                 return -1;
  60
  61         switch (node->cmd) {
  62                 case CONNECTION_FETCH:
  63                         return sdb_fe_fetch(conn, CONN_FETCH(node)->name);
  64                 case CONNECTION_LIST:
  65                         return sdb_fe_list(conn);
  66                 case CONNECTION_LOOKUP:
  67                         return sdb_fe_lookup(conn, CONN_LOOKUP(node)->matcher->matcher);
  68
  69                 default:
  70                         sdb_log(SDB_LOG_ERR, "frontend: Unknown command %i", node->cmd);
  71                         return -1;
  72         }
  73         return -1;
  74 } /* sdb_fe_exec */
  75
  76 int
  77 sdb_fe_fetch(sdb_conn_t *conn, const char *name)
  78 {
  79         sdb_strbuf_t *buf;
  80         sdb_store_obj_t *host;
  81
  82         host = sdb_store_get_host(name);
  83         if (! host) {
  84                 sdb_log(SDB_LOG_DEBUG, "frontend: Failed to fetch host '%s': "
  85                                 "not found", name);
  86
  87                 sdb_strbuf_sprintf(conn->errbuf, "Host %s not found", name);
  88                 return -1;
  89         }
  90
  91         buf = sdb_strbuf_create(1024);
  92         if (! buf) {
  93                 char errbuf[1024];
  94                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
  95                                 "buffer to handle FETCH command: %s",
  96                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
  97
  98                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
  99                 sdb_strbuf_destroy(buf);
 100                 sdb_object_deref(SDB_OBJ(host));
 101                 return -1;
 102         }
 103
 104         if (sdb_store_host_tojson(host, buf,
 105                                 /* filter = */ NULL, /* flags = */ 0)) {
 106                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 107                                 "host '%s' to JSON", name);
 108                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 109                 sdb_strbuf_destroy(buf);
 110                 sdb_object_deref(SDB_OBJ(host));
 111                 return -1;
 112         }
 113
 114         sdb_connection_send(conn, CONNECTION_OK,
 115                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 116         sdb_strbuf_destroy(buf);
 117         sdb_object_deref(SDB_OBJ(host));
 118         return 0;
 119 } /* sdb_fe_fetch */
 120
 121 int
 122 sdb_fe_list(sdb_conn_t *conn)
 123 {
 124         sdb_strbuf_t *buf;
 125
 126         buf = sdb_strbuf_create(1024);
 127         if (! buf) {
 128                 char errbuf[1024];
 129                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 130                                 "buffer to handle LIST command: %s",
 131                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 132
 133                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 134                 sdb_strbuf_destroy(buf);
 135                 return -1;
 136         }
 137
 138         if (sdb_store_tojson(buf,
 139                                 /* filter = */ NULL, /* flags = */ SDB_SKIP_ALL)) {
 140                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 141                                 "store to JSON");
 142                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 143                 sdb_strbuf_destroy(buf);
 144                 return -1;
 145         }
 146
 147         sdb_connection_send(conn, CONNECTION_OK,
 148                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 149         sdb_strbuf_destroy(buf);
 150         return 0;
 151 } /* sdb_fe_list */
 152
 153 int
 154 sdb_fe_lookup(sdb_conn_t *conn, sdb_store_matcher_t *m)
 155 {
 156         sdb_strbuf_t *buf;
 157
 158         buf = sdb_strbuf_create(1024);
 159         if (! buf) {
 160                 char errbuf[1024];
 161                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 162                                 "buffer to handle LOOKUP command: %s",
 163                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 164
 165                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 166                 sdb_strbuf_destroy(buf);
 167                 return -1;
 168         }
 169
 170         sdb_strbuf_append(buf, "[");
 171
 172         if (sdb_store_scan(m, /* filter */ NULL, lookup_tojson, buf)) {
 173                 sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup hosts");
 174                 sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup hosts");
 175                 sdb_strbuf_destroy(buf);
 176                 return -1;
 177         }
 178
 179         sdb_strbuf_append(buf, "]");
 180
 181         sdb_connection_send(conn, CONNECTION_OK,
 182                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 183         sdb_strbuf_destroy(buf);
 184         return 0;
 185 } /* sdb_fe_lookup */
 186
 187 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 188