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                 {
  83                         sdb_store_matcher_t *m = NULL, *filter = NULL;
  84                         if (CONN_LOOKUP(node)->matcher)
  85                                 m = CONN_LOOKUP(node)->matcher->matcher;
  86                         if (CONN_LOOKUP(node)->filter)
  87                                 filter = CONN_LOOKUP(node)->filter->matcher;
  88                         return sdb_fe_lookup(conn, m, filter);
  89                 }
  90
  91                 default:
  92                         sdb_log(SDB_LOG_ERR, "frontend: Unknown command %i", node->cmd);
  93                         return -1;
  94         }
  95         return -1;
  96 } /* sdb_fe_exec */
  97
  98 int
  99 sdb_fe_fetch(sdb_conn_t *conn, const char *name, sdb_store_matcher_t *filter)
 100 {
 101         sdb_strbuf_t *buf;
 102         sdb_store_obj_t *host;
 103
 104         host = sdb_store_get_host(name);
 105         if (! host) {
 106                 sdb_log(SDB_LOG_DEBUG, "frontend: Failed to fetch host '%s': "
 107                                 "not found", name);
 108
 109                 sdb_strbuf_sprintf(conn->errbuf, "Host %s not found", name);
 110                 return -1;
 111         }
 112
 113         buf = sdb_strbuf_create(1024);
 114         if (! buf) {
 115                 char errbuf[1024];
 116                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 117                                 "buffer to handle FETCH command: %s",
 118                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 119
 120                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 121                 sdb_strbuf_destroy(buf);
 122                 sdb_object_deref(SDB_OBJ(host));
 123                 return -1;
 124         }
 125
 126         if (sdb_store_host_tojson(host, buf, filter, /* flags = */ 0)) {
 127                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 128                                 "host '%s' to JSON", name);
 129                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 130                 sdb_strbuf_destroy(buf);
 131                 sdb_object_deref(SDB_OBJ(host));
 132                 return -1;
 133         }
 134
 135         sdb_connection_send(conn, CONNECTION_OK,
 136                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 137         sdb_strbuf_destroy(buf);
 138         sdb_object_deref(SDB_OBJ(host));
 139         return 0;
 140 } /* sdb_fe_fetch */
 141
 142 int
 143 sdb_fe_list(sdb_conn_t *conn, sdb_store_matcher_t *filter)
 144 {
 145         sdb_strbuf_t *buf;
 146
 147         buf = sdb_strbuf_create(1024);
 148         if (! buf) {
 149                 char errbuf[1024];
 150                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 151                                 "buffer to handle LIST command: %s",
 152                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 153
 154                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 155                 sdb_strbuf_destroy(buf);
 156                 return -1;
 157         }
 158
 159         if (sdb_store_tojson(buf, filter, /* flags = */ SDB_SKIP_ALL)) {
 160                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 161                                 "store to JSON");
 162                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 163                 sdb_strbuf_destroy(buf);
 164                 return -1;
 165         }
 166
 167         sdb_connection_send(conn, CONNECTION_OK,
 168                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 169         sdb_strbuf_destroy(buf);
 170         return 0;
 171 } /* sdb_fe_list */
 172
 173 int
 174 sdb_fe_lookup(sdb_conn_t *conn, sdb_store_matcher_t *m,
 175                 sdb_store_matcher_t *filter)
 176 {
 177         tojson_data_t data = { NULL, filter, 0 };
 178
 179         data.buf = sdb_strbuf_create(1024);
 180         if (! data.buf) {
 181                 char errbuf[1024];
 182                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 183                                 "buffer to handle LOOKUP command: %s",
 184                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 185
 186                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 187                 sdb_strbuf_destroy(data.buf);
 188                 return -1;
 189         }
 190
 191         sdb_strbuf_append(data.buf, "[");
 192
 193         /* Let the JSON serializer handle the filter instead of the scanner. Else,
 194          * we'd have to filter twice -- once in the scanner and then again in the
 195          * serializer. */
 196         data.last_len = sdb_strbuf_len(data.buf);
 197         if (sdb_store_scan(m, /* filter */ NULL, lookup_tojson, &data)) {
 198                 sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup hosts");
 199                 sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup hosts");
 200                 sdb_strbuf_destroy(data.buf);
 201                 return -1;
 202         }
 203
 204         sdb_strbuf_append(data.buf, "]");
 205
 206         sdb_connection_send(conn, CONNECTION_OK,
 207                         (uint32_t)sdb_strbuf_len(data.buf), sdb_strbuf_string(data.buf));
 208         sdb_strbuf_destroy(data.buf);
 209         return 0;
 210 } /* sdb_fe_lookup */
 211
 212 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 213