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; }
46