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 "frontend/parser.h"
  33 #include "utils/error.h"
  34 #include "utils/strbuf.h"
  35
  36 #include <errno.h>
  37 #include <string.h>
  38
  39 /*
  40  * private helper functions
  41  */
  42
  43 typedef struct {
  44         sdb_strbuf_t *buf;
  45         sdb_store_matcher_t *filter;
  46
  47         size_t last_len;
  48 } tojson_data_t;
  49
  50 static int
  51 lookup_tojson(sdb_store_obj_t *obj, void *user_data)
  52 {
  53         tojson_data_t *data = user_data;
  54         int status;
  55
  56         if (data->filter && (! sdb_store_matcher_matches(data->filter, obj, NULL)))
  57                 return 0;
  58
  59         if (sdb_strbuf_len(data->buf) > data->last_len)
  60                 sdb_strbuf_append(data->buf, ",");
  61         data->last_len = sdb_strbuf_len(data->buf);
  62         status = sdb_store_host_tojson(obj, data->buf,
  63                         data->filter, /* flags = */ 0);
  64         return status;
  65 } /* lookup_tojson */
  66
  67 /*
  68  * public API
  69  */
  70
  71 int
  72 sdb_fe_query(sdb_conn_t *conn)
  73 {
  74         sdb_llist_t *parsetree;
  75         sdb_conn_node_t *node = NULL;
  76         int status = 0;
  77
  78         parsetree = sdb_fe_parse(sdb_strbuf_string(conn->buf),
  79                         (int)conn->cmd_len);
  80         if (! parsetree) {
  81                 char query[conn->cmd_len + 1];
  82                 strncpy(query, sdb_strbuf_string(conn->buf), conn->cmd_len);
  83                 query[sizeof(query) - 1] = '\0';
  84                 sdb_log(SDB_LOG_ERR, "frontend: Failed to parse query '%s'",
  85                                 query);
  86                 return -1;
  87         }
  88
  89         switch (sdb_llist_len(parsetree)) {
  90                 case 0:
  91                         /* skipping empty command */
  92                         break;
  93                 case 1:
  94                         node = SDB_CONN_NODE(sdb_llist_get(parsetree, 0));
  95                         break;
  96
  97                 default:
  98                         {
  99                                 char query[conn->cmd_len + 1];
 100                                 strncpy(query, sdb_strbuf_string(conn->buf), conn->cmd_len);
 101                                 query[sizeof(query) - 1] = '\0';
 102                                 sdb_log(SDB_LOG_WARNING, "frontend: Ignoring %d command%s "
 103                                                 "in multi-statement query '%s'",
 104                                                 sdb_llist_len(parsetree) - 1,
 105                                                 sdb_llist_len(parsetree) == 2 ? "" : "s",
 106                                                 query);
 107                                 node = SDB_CONN_NODE(sdb_llist_get(parsetree, 0));
 108                         }
 109         }
 110
 111         if (node) {
 112                 status = sdb_fe_exec(conn, node);
 113                 sdb_object_deref(SDB_OBJ(node));
 114         }
 115
 116         sdb_llist_destroy(parsetree);
 117         return status;
 118 } /* sdb_fe_query */
 119
 120 int
 121 sdb_fe_fetch(sdb_conn_t *conn)
 122 {
 123         char hostname[conn->cmd_len + 1];
 124         strncpy(hostname, sdb_strbuf_string(conn->buf), conn->cmd_len);
 125         hostname[sizeof(hostname) - 1] = '\0';
 126         return sdb_fe_exec_fetch(conn, hostname, /* filter = */ NULL);
 127 } /* sdb_fe_fetch */
 128
 129 int
 130 sdb_fe_list(sdb_conn_t *conn)
 131 {
 132         return sdb_fe_exec_list(conn, /* filter = */ NULL);
 133 } /* sdb_fe_list */
 134
 135 int
 136 sdb_fe_lookup(sdb_conn_t *conn)
 137 {
 138         sdb_store_matcher_t *m;
 139         int status;
 140
 141         m = sdb_fe_parse_matcher(sdb_strbuf_string(conn->buf),
 142                         (int)conn->cmd_len);
 143         if (! m) {
 144                 char expr[conn->cmd_len + 1];
 145                 strncpy(expr, sdb_strbuf_string(conn->buf), conn->cmd_len);
 146                 expr[sizeof(expr) - 1] = '\0';
 147                 sdb_log(SDB_LOG_ERR, "frontend: Failed to parse "
 148                                 "lookup condition '%s'", expr);
 149                 return -1;
 150         }
 151
 152         status = sdb_fe_exec_lookup(conn, m, /* filter = */ NULL);
 153         sdb_object_deref(SDB_OBJ(m));
 154         return status;
 155 } /* sdb_fe_lookup */
 156
 157 int
 158 sdb_fe_exec(sdb_conn_t *conn, sdb_conn_node_t *node)
 159 {
 160         if (! node)
 161                 return -1;
 162
 163         switch (node->cmd) {
 164                 case CONNECTION_FETCH:
 165                         return sdb_fe_exec_fetch(conn, CONN_FETCH(node)->name,
 166                                         /* filter = */ NULL);
 167                 case CONNECTION_LIST:
 168                         return sdb_fe_exec_list(conn, /* filter = */ NULL);
 169                 case CONNECTION_LOOKUP:
 170                 {
 171                         sdb_store_matcher_t *m = NULL, *filter = NULL;
 172                         if (CONN_LOOKUP(node)->matcher)
 173                                 m = CONN_LOOKUP(node)->matcher->matcher;
 174                         if (CONN_LOOKUP(node)->filter)
 175                                 filter = CONN_LOOKUP(node)->filter->matcher;
 176                         return sdb_fe_exec_lookup(conn, m, filter);
 177                 }
 178
 179                 default:
 180                         sdb_log(SDB_LOG_ERR, "frontend: Unknown command %i", node->cmd);
 181                         return -1;
 182         }
 183         return -1;
 184 } /* sdb_fe_exec */
 185
 186 int
 187 sdb_fe_exec_fetch(sdb_conn_t *conn, const char *name,
 188                 sdb_store_matcher_t *filter)
 189 {
 190         sdb_strbuf_t *buf;
 191         sdb_store_obj_t *host;
 192
 193         host = sdb_store_get_host(name);
 194         if (! host) {
 195                 sdb_log(SDB_LOG_DEBUG, "frontend: Failed to fetch host '%s': "
 196                                 "not found", name);
 197
 198                 sdb_strbuf_sprintf(conn->errbuf, "Host %s not found", name);
 199                 return -1;
 200         }
 201
 202         buf = sdb_strbuf_create(1024);
 203         if (! buf) {
 204                 char errbuf[1024];
 205                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 206                                 "buffer to handle FETCH command: %s",
 207                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 208
 209                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 210                 sdb_strbuf_destroy(buf);
 211                 sdb_object_deref(SDB_OBJ(host));
 212                 return -1;
 213         }
 214
 215         if (sdb_store_host_tojson(host, buf, filter, /* flags = */ 0)) {
 216                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 217                                 "host '%s' to JSON", name);
 218                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 219                 sdb_strbuf_destroy(buf);
 220                 sdb_object_deref(SDB_OBJ(host));
 221                 return -1;
 222         }
 223
 224         sdb_connection_send(conn, CONNECTION_OK,
 225                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 226         sdb_strbuf_destroy(buf);
 227         sdb_object_deref(SDB_OBJ(host));
 228         return 0;
 229 } /* sdb_fe_exec_fetch */
 230
 231 int
 232 sdb_fe_exec_list(sdb_conn_t *conn, sdb_store_matcher_t *filter)
 233 {
 234         sdb_strbuf_t *buf;
 235
 236         buf = sdb_strbuf_create(1024);
 237         if (! buf) {
 238                 char errbuf[1024];
 239                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 240                                 "buffer to handle LIST command: %s",
 241                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 242
 243                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 244                 sdb_strbuf_destroy(buf);
 245                 return -1;
 246         }
 247
 248         if (sdb_store_tojson(buf, filter, /* flags = */ SDB_SKIP_ALL)) {
 249                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 250                                 "store to JSON");
 251                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 252                 sdb_strbuf_destroy(buf);
 253                 return -1;
 254         }
 255
 256         sdb_connection_send(conn, CONNECTION_OK,
 257                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 258         sdb_strbuf_destroy(buf);
 259         return 0;
 260 } /* sdb_fe_exec_list */
 261
 262 int
 263 sdb_fe_exec_lookup(sdb_conn_t *conn, sdb_store_matcher_t *m,
 264                 sdb_store_matcher_t *filter)
 265 {
 266         tojson_data_t data = { NULL, filter, 0 };
 267
 268         data.buf = sdb_strbuf_create(1024);
 269         if (! data.buf) {
 270                 char errbuf[1024];
 271                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 272                                 "buffer to handle LOOKUP command: %s",
 273                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 274
 275                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 276                 sdb_strbuf_destroy(data.buf);
 277                 return -1;
 278         }
 279
 280         sdb_strbuf_append(data.buf, "[");
 281
 282         /* Let the JSON serializer handle the filter instead of the scanner. Else,
 283          * we'd have to filter twice -- once in the scanner and then again in the
 284          * serializer. */
 285         data.last_len = sdb_strbuf_len(data.buf);
 286         if (sdb_store_scan(m, /* filter */ NULL, lookup_tojson, &data)) {
 287                 sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup hosts");
 288                 sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup hosts");
 289                 sdb_strbuf_destroy(data.buf);
 290                 return -1;
 291         }
 292
 293         sdb_strbuf_append(data.buf, "]");
 294
 295         sdb_connection_send(conn, CONNECTION_OK,
 296                         (uint32_t)sdb_strbuf_len(data.buf), sdb_strbuf_string(data.buf));
 297         sdb_strbuf_destroy(data.buf);
 298         return 0;
 299 } /* sdb_fe_exec_lookup */
 300
 301 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 302