src/zoom-memcached.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) Index Data
   3  * See the file LICENSE for details.
   4  */
   5 /**
   6  * \file zoom-memcached.c
   7  * \brief Implements query/record caching using memcached
   8  */
   9 #if HAVE_CONFIG_H
  10 #include <config.h>
  11 #endif
  12
  13 #include <assert.h>
  14 #include <string.h>
  15 #include <errno.h>
  16 #include "zoom-p.h"
  17
  18 #include <yaz/yaz-util.h>
  19 #include <yaz/xmalloc.h>
  20 #include <yaz/log.h>
  21 #include <yaz/diagbib1.h>
  22
  23 void ZOOM_memcached_init(ZOOM_connection c)
  24 {
  25 #if HAVE_LIBMEMCACHED_MEMCACHED_H
  26     c->mc_st = 0;
  27 #endif
  28 }
  29
  30 void ZOOM_memcached_destroy(ZOOM_connection c)
  31 {
  32 #if HAVE_LIBMEMCACHED_MEMCACHED_H
  33     if (c->mc_st)
  34         memcached_free(c->mc_st);
  35 #endif
  36 }
  37
  38 int ZOOM_memcached_configure(ZOOM_connection c)
  39 {
  40     const char *val;
  41 #if HAVE_LIBMEMCACHED_MEMCACHED_H
  42     if (c->mc_st)
  43     {
  44         memcached_free(c->mc_st);
  45         c->mc_st = 0;
  46     }
  47 #endif
  48     val = ZOOM_options_get(c->options, "memcached");
  49     if (val && *val)
  50     {
  51 #if HAVE_LIBMEMCACHED_MEMCACHED_H
  52         c->mc_st = memcached(val, strlen(val));
  53         if (!c->mc_st)
  54         {
  55             ZOOM_set_error(c, ZOOM_ERROR_MEMCACHED, val);
  56             return -1;
  57         }
  58 #else
  59         ZOOM_set_error(c, ZOOM_ERROR_MEMCACHED, "not enabled");
  60         return -1;
  61 #endif
  62     }
  63     return 0;
  64 }
  65
  66 void ZOOM_memcached_resultset(ZOOM_resultset r, ZOOM_query q)
  67 {
  68 #if HAVE_LIBMEMCACHED_MEMCACHED_H
  69     ZOOM_connection c = r->connection;
  70     r->mc_key = wrbuf_alloc();
  71     wrbuf_puts(r->mc_key, "0;");
  72     wrbuf_puts(r->mc_key, c->host_port);
  73     wrbuf_puts(r->mc_key, ";");
  74     if (c->user)
  75         wrbuf_puts(r->mc_key, c->user);
  76     wrbuf_puts(r->mc_key, ";");
  77     if (c->group)
  78         wrbuf_puts(r->mc_key, c->group);
  79     wrbuf_puts(r->mc_key, ";");
  80     if (c->password)
  81         wrbuf_sha1_puts(r->mc_key, c->password, 1);
  82     wrbuf_puts(r->mc_key, ";");
  83     {
  84         WRBUF w = wrbuf_alloc();
  85         ZOOM_query_get_hash(q, w);
  86         wrbuf_sha1_puts(r->mc_key, wrbuf_cstr(w), 1);
  87         wrbuf_destroy(w);
  88     }
  89     wrbuf_puts(r->mc_key, ";");
  90 #endif
  91 }
  92
  93 void ZOOM_memcached_search(ZOOM_connection c, ZOOM_resultset resultset)
  94 {
  95 #if HAVE_LIBMEMCACHED_MEMCACHED_H
  96     /* TODO: add sorting */
  97     if (c->mc_st && resultset->live_set == 0)
  98     {
  99         size_t v_len;
 100         uint32_t flags;
 101         memcached_return_t rc;
 102         char *v = memcached_get(c->mc_st, wrbuf_buf(resultset->mc_key),
 103                                 wrbuf_len(resultset->mc_key),
 104                                 &v_len, &flags, &rc);
 105         if (v)
 106         {
 107             ZOOM_Event event;
 108             WRBUF w = wrbuf_alloc();
 109
 110             wrbuf_write(w, v, v_len);
 111             free(v);
 112             resultset->size = odr_atoi(wrbuf_cstr(w));
 113
 114             yaz_log(YLOG_LOG, "For key %s got value %s",
 115                     wrbuf_cstr(resultset->mc_key), wrbuf_cstr(w));
 116
 117             wrbuf_destroy(w);
 118             event = ZOOM_Event_create(ZOOM_EVENT_RECV_SEARCH);
 119             ZOOM_connection_put_event(c, event);
 120             resultset->live_set = 1;
 121         }
 122     }
 123 #endif
 124 }
 125
 126 void ZOOM_memcached_hitcount(ZOOM_connection c, ZOOM_resultset resultset)
 127 {
 128 #if HAVE_LIBMEMCACHED_MEMCACHED_H
 129     if (c->mc_st && resultset->live_set == 0)
 130     {
 131         uint32_t flags = 0;
 132         memcached_return_t rc;
 133         time_t expiration = 36000;
 134         char str[40];
 135
 136         sprintf(str, ODR_INT_PRINTF, resultset->size);
 137         rc = memcached_set(c->mc_st,
 138                            wrbuf_buf(resultset->mc_key),wrbuf_len(resultset->mc_key),
 139                            str, strlen(str), expiration, flags);
 140         yaz_log(YLOG_LOG, "Store hit count key=%s value=%s rc=%u %s",
 141                 wrbuf_cstr(resultset->mc_key), str, (unsigned) rc,
 142                 memcached_last_error_message(c->mc_st));
 143     }
 144 #endif
 145 }
 146
 147 void ZOOM_memcached_add(ZOOM_resultset r, Z_NamePlusRecord *npr,
 148                         int pos,
 149                         const char *syntax, const char *elementSetName,
 150                         const char *schema,
 151                         Z_SRW_diagnostic *diag)
 152 {
 153 #if HAVE_LIBMEMCACHED_MEMCACHED_H
 154     if (r->connection->mc_st &&
 155         !diag && npr->which == Z_NamePlusRecord_databaseRecord)
 156     {
 157         WRBUF k = wrbuf_alloc();
 158         uint32_t flags = 0;
 159         memcached_return_t rc;
 160         time_t expiration = 36000;
 161         ODR odr = odr_createmem(ODR_ENCODE);
 162         char *rec_buf;
 163         int rec_len;
 164
 165         z_NamePlusRecord(odr, &npr, 0, 0);
 166         rec_buf = odr_getbuf(odr, &rec_len, 0);
 167
 168         wrbuf_write(k, wrbuf_buf(r->mc_key), wrbuf_len(r->mc_key));
 169         wrbuf_printf(k, ";%d;%s;%s;%s", pos,
 170                      syntax ? syntax : "",
 171                      elementSetName ? elementSetName : "",
 172                      schema ? schema : "");
 173         rc = memcached_set(r->connection->mc_st,
 174                            wrbuf_buf(k),wrbuf_len(k),
 175                            rec_buf, rec_len,
 176                            expiration, flags);
 177
 178         yaz_log(YLOG_LOG, "Store record lkey=%s len=%d rc=%u %s",
 179                 wrbuf_cstr(k), rec_len, (unsigned) rc,
 180                 memcached_last_error_message(r->connection->mc_st));
 181         odr_destroy(odr);
 182         wrbuf_destroy(k);
 183     }
 184 #endif
 185 }
 186
 187 Z_NamePlusRecord *ZOOM_memcached_lookup(ZOOM_resultset r, int pos,
 188                                         const char *syntax,
 189                                         const char *elementSetName,
 190                                         const char *schema)
 191 {
 192 #if HAVE_LIBMEMCACHED_MEMCACHED_H
 193     if (r->connection && r->connection->mc_st)
 194     {
 195         WRBUF k = wrbuf_alloc();
 196         size_t v_len;
 197         char *v_buf;
 198         uint32_t flags;
 199         memcached_return_t rc;
 200
 201         wrbuf_write(k, wrbuf_buf(r->mc_key), wrbuf_len(r->mc_key));
 202         wrbuf_printf(k, ";%d;%s;%s;%s", pos,
 203                      syntax ? syntax : "",
 204                      elementSetName ? elementSetName : "",
 205                      schema ? schema : "");
 206
 207         yaz_log(YLOG_LOG, "Lookup record %s", wrbuf_cstr(k));
 208         v_buf = memcached_get(r->connection->mc_st, wrbuf_buf(k), wrbuf_len(k),
 209                               &v_len, &flags, &rc);
 210         wrbuf_destroy(k);
 211         if (v_buf)
 212         {
 213             Z_NamePlusRecord *npr = 0;
 214
 215             odr_setbuf(r->odr, v_buf, v_len, 0);
 216             z_NamePlusRecord(r->odr, &npr, 0, 0);
 217             free(v_buf);
 218             if (npr)
 219                 yaz_log(YLOG_LOG, "returned memcached copy");
 220             return npr;
 221         }
 222     }
 223 #endif
 224     return 0;
 225
 226 }
 227 /*
 228  * Local variables:
 229  * c-basic-offset: 4
 230  * c-file-style: "Stroustrup"
 231  * indent-tabs-mode: nil
 232  * End:
 233  * vim: shiftwidth=4 tabstop=8 expandtab
 234  */
 235