lldb/source/Utility/UserIDResolver.cpp

   1 //===-- UserIDResolver.cpp ------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "lldb/Utility/UserIDResolver.h"
  10 #include "llvm/Support/ManagedStatic.h"
  11 #include <optional>
  12
  13 using namespace lldb_private;
  14
  15 UserIDResolver::~UserIDResolver() = default;
  16
  17 std::optional<llvm::StringRef> UserIDResolver::Get(
  18     id_t id, Map &cache,
  19     std::optional<std::string> (UserIDResolver::*do_get)(id_t)) {
  20
  21   std::lock_guard<std::mutex> guard(m_mutex);
  22   auto iter_bool = cache.try_emplace(id, std::nullopt);
  23   if (iter_bool.second)
  24     iter_bool.first->second = (this->*do_get)(id);
  25   if (iter_bool.first->second)
  26     return llvm::StringRef(*iter_bool.first->second);
  27   return std::nullopt;
  28 }
  29
  30 namespace {
  31 class NoopResolver : public UserIDResolver {
  32 protected:
  33   std::optional<std::string> DoGetUserName(id_t uid) override {
  34     return std::nullopt;
  35   }
  36
  37   std::optional<std::string> DoGetGroupName(id_t gid) override {
  38     return std::nullopt;
  39   }
  40 };
  41 } // namespace
  42
  43 static llvm::ManagedStatic<NoopResolver> g_noop_resolver;
  44
  45 UserIDResolver &UserIDResolver::GetNoopResolver() { return *g_noop_resolver; }