1 //===-- UserIDResolver.cpp --------------------------------------*- C++ -*-===//
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 
12 using namespace lldb_private;
13 
14 UserIDResolver::~UserIDResolver() = default;
15 
16 llvm::Optional<llvm::StringRef> UserIDResolver::Get(
17     id_t id, Map &cache,
18     llvm::Optional<std::string> (UserIDResolver::*do_get)(id_t)) {
19 
20   std::lock_guard<std::mutex> guard(m_mutex);
21   auto iter_bool = cache.try_emplace(id, llvm::None);
22   if (iter_bool.second)
23     iter_bool.first->second = (this->*do_get)(id);
24   if (iter_bool.first->second)
25     return llvm::StringRef(*iter_bool.first->second);
26   return llvm::None;
27 }
28 
29 namespace {
30 class NoopResolver : public UserIDResolver {
31 protected:
32   llvm::Optional<std::string> DoGetUserName(id_t uid) override {
33     return llvm::None;
34   }
35 
36   llvm::Optional<std::string> DoGetGroupName(id_t gid) override {
37     return llvm::None;
38   }
39 };
40 } // namespace
41 
42 static llvm::ManagedStatic<NoopResolver> g_noop_resolver;
43 
44 UserIDResolver &UserIDResolver::GetNoopResolver() { return *g_noop_resolver; }
45