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_zone.h"
   9
  10 using namespace std;
  11
  12 int RGWSI_ZoneUtils::do_start(optional_yield, const DoutPrefixProvider *dpp)
  13 {
  14   init_unique_trans_id_deps();
  15
  16   return 0;
  17 }
  18
  19 string RGWSI_ZoneUtils::gen_host_id() {
  20   /* uint64_t needs 16, two '-' separators and a trailing null */
  21   const string& zone_name = zone_svc->get_zone().name;
  22   const string& zonegroup_name = zone_svc->get_zonegroup().get_name();
  23   char charbuf[16 + zone_name.size() + zonegroup_name.size() + 2 + 1];
  24   snprintf(charbuf, sizeof(charbuf), "%llx-%s-%s", (unsigned long long)rados_svc->instance_id(), zone_name.c_str(), zonegroup_name.c_str());
  25   return string(charbuf);
  26 }
  27
  28 string RGWSI_ZoneUtils::unique_id(uint64_t unique_num)
  29 {
  30   char buf[32];
  31   snprintf(buf, sizeof(buf), ".%llu.%llu", (unsigned long long)rados_svc->instance_id(), (unsigned long long)unique_num);
  32   string s = zone_svc->get_zone_params().get_id() + buf;
  33   return s;
  34 }
  35
  36 void RGWSI_ZoneUtils::init_unique_trans_id_deps() {
  37   char buf[16 + 2 + 1]; /* uint64_t needs 16, 2 hyphens add further 2 */
  38
  39   snprintf(buf, sizeof(buf), "-%llx-", (unsigned long long)rados_svc->instance_id());
  40   url_encode(string(buf) + zone_svc->get_zone().name, trans_id_suffix);
  41 }
  42
  43 /* In order to preserve compatibility with Swift API, transaction ID
  44  * should contain at least 32 characters satisfying following spec:
  45  *  - first 21 chars must be in range [0-9a-f]. Swift uses this
  46  *    space for storing fragment of UUID obtained through a call to
  47  *    uuid4() function of Python's uuid module;
  48  *  - char no. 22 must be a hyphen;
  49  *  - at least 10 next characters constitute hex-formatted timestamp
  50  *    padded with zeroes if necessary. All bytes must be in [0-9a-f]
  51  *    range;
  52  *  - last, optional part of transaction ID is any url-encoded string
  53  *    without restriction on length. */
  54 string RGWSI_ZoneUtils::unique_trans_id(const uint64_t unique_num) {
  55   char buf[41]; /* 2 + 21 + 1 + 16 (timestamp can consume up to 16) + 1 */
  56   time_t timestamp = time(NULL);
  57
  58   snprintf(buf, sizeof(buf), "tx%021llx-%010llx",
  59            (unsigned long long)unique_num,
  60            (unsigned long long)timestamp);
  61
  62   return string(buf) + trans_id_suffix;
  63 }
  64