ceph/src/crush/CrushLocation.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include <vector>
   5
   6 #include "CrushLocation.h"
   7 #include "CrushWrapper.h"
   8 #include "common/ceph_context.h"
   9 #include "common/config.h"
  10 #include "common/debug.h"
  11 #include "common/errno.h"
  12 #include "include/common_fwd.h"
  13 #include "include/compat.h"
  14 #include "include/str_list.h"
  15
  16 namespace ceph::crush {
  17
  18 int CrushLocation::update_from_conf()
  19 {
  20   if (cct->_conf->crush_location.length())
  21     return _parse(cct->_conf->crush_location);
  22   return 0;
  23 }
  24
  25 int CrushLocation::_parse(const std::string& s)
  26 {
  27   std::multimap<std::string,std::string> new_crush_location;
  28   std::vector<std::string> lvec;
  29   get_str_vec(s, ";, \t", lvec);
  30   int r = CrushWrapper::parse_loc_multimap(lvec, &new_crush_location);
  31   if (r < 0) {
  32     lderr(cct) << "warning: crush_location '" << cct->_conf->crush_location
  33                << "' does not parse, keeping original crush_location "
  34                << loc << dendl;
  35     return -EINVAL;
  36   }
  37   std::lock_guard l(lock);
  38   loc.swap(new_crush_location);
  39   lgeneric_dout(cct, 10) << "crush_location is " << loc << dendl;
  40   return 0;
  41 }
  42
  43 int CrushLocation::update_from_hook()
  44 {
  45   if (cct->_conf->crush_location_hook.length() == 0)
  46     return 0;
  47
  48 #if defined(WITH_SEASTAR) && !defined(WITH_ALIEN)
  49   ceph_abort_msg("crimson does not support crush_location_hook, it must stay empty");
  50 #else
  51   if (0 != access(cct->_conf->crush_location_hook.c_str(), R_OK)) {
  52     lderr(cct) << "the user define crush location hook: " << cct->_conf->crush_location_hook
  53                << " may not exist or can not access it" << dendl;
  54     return errno;
  55   }
  56
  57   SubProcessTimed hook(
  58     cct->_conf->crush_location_hook.c_str(),
  59     SubProcess::CLOSE, SubProcess::PIPE, SubProcess::PIPE,
  60     cct->_conf->crush_location_hook_timeout);
  61   hook.add_cmd_args(
  62     "--cluster", cct->_conf->cluster.c_str(),
  63     "--id", cct->_conf->name.get_id().c_str(),
  64     "--type", cct->_conf->name.get_type_str(),
  65     NULL);
  66   int ret = hook.spawn();
  67   if (ret != 0) {
  68     lderr(cct) << "error: failed run " << cct->_conf->crush_location_hook << ": "
  69                << hook.err() << dendl;
  70     return ret;
  71   }
  72
  73   ceph::buffer::list bl;
  74   ret = bl.read_fd(hook.get_stdout(), 100 * 1024);
  75   if (ret < 0) {
  76     lderr(cct) << "error: failed read stdout from "
  77                << cct->_conf->crush_location_hook
  78                << ": " << cpp_strerror(-ret) << dendl;
  79     ceph::buffer::list err;
  80     err.read_fd(hook.get_stderr(), 100 * 1024);
  81     lderr(cct) << "stderr:\n";
  82     err.hexdump(*_dout);
  83     *_dout << dendl;
  84   }
  85
  86   if (hook.join() != 0) {
  87     lderr(cct) << "error: failed to join: " << hook.err() << dendl;
  88     return -EINVAL;
  89   }
  90
  91   if (ret < 0)
  92     return ret;
  93
  94   std::string out;
  95   bl.begin().copy(bl.length(), out);
  96   out.erase(out.find_last_not_of(" \n\r\t")+1);
  97   return _parse(out);
  98 #endif // WITH_SEASTAR && !WITH_ALIEN
  99 }
 100
 101 int CrushLocation::init_on_startup()
 102 {
 103   if (cct->_conf->crush_location.length()) {
 104     return update_from_conf();
 105   }
 106   if (cct->_conf->crush_location_hook.length()) {
 107     return update_from_hook();
 108   }
 109
 110   // start with a sane default
 111   char hostname[HOST_NAME_MAX + 1];
 112   int r = gethostname(hostname, sizeof(hostname));
 113   if (r < 0)
 114     strcpy(hostname, "unknown_host");
 115   // use short hostname
 116   for (unsigned i=0; hostname[i]; ++i) {
 117     if (hostname[i] == '.') {
 118       hostname[i] = '\0';
 119       break;
 120     }
 121   }
 122   std::lock_guard l(lock);
 123   loc.clear();
 124   loc.insert(std::make_pair<std::string,std::string>("host", hostname));
 125   loc.insert(std::make_pair<std::string,std::string>("root", "default"));
 126   return 0;
 127 }
 128
 129 std::multimap<std::string,std::string> CrushLocation::get_location() const
 130 {
 131   std::lock_guard l(lock);
 132   return loc;
 133 }
 134
 135 std::ostream& operator<<(std::ostream& os, const CrushLocation& loc)
 136 {
 137   bool first = true;
 138   for (auto& [type, pos] : loc.get_location()) {
 139     if (first) {
 140       first = false;
 141     } else {
 142       os << ", ";
 143     }
 144     os << '"' << type << '=' << pos << '"';
 145   }
 146   return os;
 147 }
 148
 149 }