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         if ((! conn) || (conn->cmd != CONNECTION_QUERY))
  79                 return -1;
  80
  81         parsetree = sdb_fe_parse(sdb_strbuf_string(conn->buf),
  82                         (int)conn->cmd_len);
  83         if (! parsetree) {
  84                 char query[conn->cmd_len + 1];
  85                 strncpy(query, sdb_strbuf_string(conn->buf), conn->cmd_len);
  86                 query[sizeof(query) - 1] = '\0';
  87                 sdb_log(SDB_LOG_ERR, "frontend: Failed to parse query '%s'",
  88                                 query);
  89                 return -1;
  90         }
  91
  92         switch (sdb_llist_len(parsetree)) {
  93                 case 0:
  94                         /* skipping empty command */
  95                         break;
  96                 case 1:
  97                         node = SDB_CONN_NODE(sdb_llist_get(parsetree, 0));
  98                         break;
  99
 100                 default:
 101                         {
 102                                 char query[conn->cmd_len + 1];
 103                                 strncpy(query, sdb_strbuf_string(conn->buf), conn->cmd_len);
 104                                 query[sizeof(query) - 1] = '\0';
 105                                 sdb_log(SDB_LOG_WARNING, "frontend: Ignoring %d command%s "
 106                                                 "in multi-statement query '%s'",
 107                                                 sdb_llist_len(parsetree) - 1,
 108                                                 sdb_llist_len(parsetree) == 2 ? "" : "s",
 109                                                 query);
 110                                 node = SDB_CONN_NODE(sdb_llist_get(parsetree, 0));
 111                         }
 112         }
 113
 114         if (node) {
 115                 status = sdb_fe_exec(conn, node);
 116                 sdb_object_deref(SDB_OBJ(node));
 117         }
 118
 119         sdb_llist_destroy(parsetree);
 120         return status;
 121 } /* sdb_fe_query */
 122
 123 int
 124 sdb_fe_fetch(sdb_conn_t *conn)
 125 {
 126         char hostname[conn->cmd_len + 1];
 127         if ((! conn) || (conn->cmd != CONNECTION_FETCH))
 128                 return -1;
 129         strncpy(hostname, sdb_strbuf_string(conn->buf), conn->cmd_len);
 130         hostname[sizeof(hostname) - 1] = '\0';
 131         return sdb_fe_exec_fetch(conn, hostname, /* filter = */ NULL);
 132 } /* sdb_fe_fetch */
 133
 134 int
 135 sdb_fe_list(sdb_conn_t *conn)
 136 {
 137         if ((! conn) || (conn->cmd != CONNECTION_LIST))
 138                 return -1;
 139         return sdb_fe_exec_list(conn, /* filter = */ NULL);
 140 } /* sdb_fe_list */
 141
 142 int
 143 sdb_fe_lookup(sdb_conn_t *conn)
 144 {
 145         sdb_store_matcher_t *m;
 146         int status;
 147
 148         if ((! conn) || (conn->cmd != CONNECTION_LOOKUP))
 149                 return -1;
 150
 151         m = sdb_fe_parse_matcher(sdb_strbuf_string(conn->buf),
 152                         (int)conn->cmd_len);
 153         if (! m) {
 154                 char expr[conn->cmd_len + 1];
 155                 strncpy(expr, sdb_strbuf_string(conn->buf), conn->cmd_len);
 156                 expr[sizeof(expr) - 1] = '\0';
 157                 sdb_log(SDB_LOG_ERR, "frontend: Failed to parse "
 158                                 "lookup condition '%s'", expr);
 159                 return -1;
 160         }
 161
 162         status = sdb_fe_exec_lookup(conn, m, /* filter = */ NULL);
 163         sdb_object_deref(SDB_OBJ(m));
 164         return status;
 165 } /* sdb_fe_lookup */
 166
 167 int
 168 sdb_fe_exec(sdb_conn_t *conn, sdb_conn_node_t *node)
 169 {
 170         if (! node)
 171                 return -1;
 172
 173         switch (node->cmd) {
 174                 case CONNECTION_FETCH:
 175                         return sdb_fe_exec_fetch(conn, CONN_FETCH(node)->name,
 176                                         /* filter = */ NULL);
 177                 case CONNECTION_LIST:
 178                         return sdb_fe_exec_list(conn, /* filter = */ NULL);
 179                 case CONNECTION_LOOKUP:
 180                 {
 181                         sdb_store_matcher_t *m = NULL, *filter = NULL;
 182                         if (CONN_LOOKUP(node)->matcher)
 183                                 m = CONN_LOOKUP(node)->matcher->matcher;
 184                         if (CONN_LOOKUP(node)->filter)
 185                                 filter = CONN_LOOKUP(node)->filter->matcher;
 186                         return sdb_fe_exec_lookup(conn, m, filter);
 187                 }
 188
 189                 default:
 190                         sdb_log(SDB_LOG_ERR, "frontend: Unknown command %i", node->cmd);
 191                         return -1;
 192         }
 193         return -1;
 194 } /* sdb_fe_exec */
 195
 196 int
 197 sdb_fe_exec_fetch(sdb_conn_t *conn, const char *name,
 198                 sdb_store_matcher_t *filter)
 199 {
 200         sdb_strbuf_t *buf;
 201         sdb_store_obj_t *host;
 202
 203         host = sdb_store_get_host(name);
 204         if (! host) {
 205                 sdb_log(SDB_LOG_DEBUG, "frontend: Failed to fetch host '%s': "
 206                                 "not found", name);
 207
 208                 sdb_strbuf_sprintf(conn->errbuf, "Host %s not found", name);
 209                 return -1;
 210         }
 211
 212         buf = sdb_strbuf_create(1024);
 213         if (! buf) {
 214                 char errbuf[1024];
 215                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 216                                 "buffer to handle FETCH command: %s",
 217                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 218
 219                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 220                 sdb_strbuf_destroy(buf);
 221                 sdb_object_deref(SDB_OBJ(host));
 222                 return -1;
 223         }
 224
 225         if (sdb_store_host_tojson(host, buf, filter, /* flags = */ 0)) {
 226                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 227                                 "host '%s' to JSON", name);
 228                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 229                 sdb_strbuf_destroy(buf);
 230                 sdb_object_deref(SDB_OBJ(host));
 231                 return -1;
 232         }
 233
 234         sdb_connection_send(conn, CONNECTION_OK,
 235                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 236         sdb_strbuf_destroy(buf);
 237         sdb_object_deref(SDB_OBJ(host));
 238         return 0;
 239 } /* sdb_fe_exec_fetch */
 240
 241 int
 242 sdb_fe_exec_list(sdb_conn_t *conn, sdb_store_matcher_t *filter)
 243 {
 244         sdb_strbuf_t *buf;
 245
 246         buf = sdb_strbuf_create(1024);
 247         if (! buf) {
 248                 char errbuf[1024];
 249                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 250                                 "buffer to handle LIST command: %s",
 251                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 252
 253                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 254                 sdb_strbuf_destroy(buf);
 255                 return -1;
 256         }
 257
 258         if (sdb_store_tojson(buf, filter, /* flags = */ SDB_SKIP_ALL)) {
 259                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 260                                 "store to JSON");
 261                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 262                 sdb_strbuf_destroy(buf);
 263                 return -1;
 264         }
 265
 266         sdb_connection_send(conn, CONNECTION_OK,
 267                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 268         sdb_strbuf_destroy(buf);
 269         return 0;
 270 } /* sdb_fe_exec_list */
 271
 272 int
 273 sdb_fe_exec_lookup(sdb_conn_t *conn, sdb_store_matcher_t *m,
 274                 sdb_store_matcher_t *filter)
 275 {
 276         tojson_data_t data = { NULL, filter, 0 };
 277
 278         data.buf = sdb_strbuf_create(1024);
 279         if (! data.buf) {
 280                 char errbuf[1024];
 281                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 282                                 "buffer to handle LOOKUP command: %s",
 283                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 284
 285                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 286                 sdb_strbuf_destroy(data.buf);
 287                 return -1;
 288         }
 289
 290         sdb_strbuf_append(data.buf, "[");
 291
 292         /* Let the JSON serializer handle the filter instead of the scanner. Else,
 293          * we'd have to filter twice -- once in the scanner and then again in the
 294          * serializer. */
 295         data.last_len = sdb_strbuf_len(data.buf);
 296         if (sdb_store_scan(m, /* filter */ NULL, lookup_tojson, &data)) {
 297                 sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup hosts");
 298                 sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup hosts");
 299                 sdb_strbuf_destroy(data.buf);
 300                 return -1;
 301         }
 302
 303         sdb_strbuf_append(data.buf, "]");
 304
 305         sdb_connection_send(conn, CONNECTION_OK,
 306                         (uint32_t)sdb_strbuf_len(data.buf), sdb_strbuf_string(data.buf));
 307         sdb_strbuf_destroy(data.buf);
 308         return 0;
 309 } /* sdb_fe_exec_lookup */
 310
 311 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 312