ceph/src/rgw/services/svc_zone_utils.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab ft=cpp
   3
   4 #include "svc_zone_utils.h"
   5 #include "svc_rados.h"
   6 #include "svc_zone.h"
   7
   8 #include "rgw/rgw_zone.h"
   9
  10 int RGWSI_ZoneUtils::do_start(optional_yield, const DoutPrefixProvider *dpp)
  11 {
  12   init_unique_trans_id_deps();
  13
  14   return 0;
  15 }
  16
  17 string RGWSI_ZoneUtils::gen_host_id() {
  18   /* uint64_t needs 16, two '-' separators and a trailing null */
  19   const string& zone_name = zone_svc->get_zone().name;
  20   const string& zonegroup_name = zone_svc->get_zonegroup().get_name();
  21   char charbuf[16 + zone_name.size() + zonegroup_name.size() + 2 + 1];
  22   snprintf(charbuf, sizeof(charbuf), "%llx-%s-%s", (unsigned long long)rados_svc->instance_id(), zone_name.c_str(), zonegroup_name.c_str());
  23   return string(charbuf);
  24 }
  25
  26 string RGWSI_ZoneUtils::unique_id(uint64_t unique_num)
  27 {
  28   char buf[32];
  29   snprintf(buf, sizeof(buf), ".%llu.%llu", (unsigned long long)rados_svc->instance_id(), (unsigned long long)unique_num);
  30   string s = zone_svc->get_zone_params().get_id() + buf;
  31   return s;
  32 }
  33
  34 void RGWSI_ZoneUtils::init_unique_trans_id_deps() {
  35   char buf[16 + 2 + 1]; /* uint64_t needs 16, 2 hyphens add further 2 */
  36
  37   snprintf(buf, sizeof(buf), "-%llx-", (unsigned long long)rados_svc->instance_id());
  38   url_encode(string(buf) + zone_svc->get_zone().name, trans_id_suffix);
  39 }
  40
  41 /* In order to preserve compatibility with Swift API, transaction ID
  42  * should contain at least 32 characters satisfying following spec:
  43  *  - first 21 chars must be in range [0-9a-f]. Swift uses this
  44  *    space for storing fragment of UUID obtained through a call to
  45  *    uuid4() function of Python's uuid module;
  46  *  - char no. 22 must be a hyphen;
  47  *  - at least 10 next characters constitute hex-formatted timestamp
  48  *    padded with zeroes if necessary. All bytes must be in [0-9a-f]
  49  *    range;
  50  *  - last, optional part of transaction ID is any url-encoded string
  51  *    without restriction on length. */
  52 string RGWSI_ZoneUtils::unique_trans_id(const uint64_t unique_num) {
  53   char buf[41]; /* 2 + 21 + 1 + 16 (timestamp can consume up to 16) + 1 */
  54   time_t timestamp = time(NULL);
  55
  56   snprintf(buf, sizeof(buf), "tx%021llx-%010llx",
  57            (unsigned long long)unique_num,
  58            (unsigned long long)timestamp);
  59
  60   return string(buf) + trans_id_suffix;
  61 }
  62