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
12using namespace lldb_private;
13
14UserIDResolver::~UserIDResolver() = default;
15
16llvm::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
29namespace {
30class NoopResolver : public UserIDResolver {
31protected:
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
42static llvm::ManagedStatic<NoopResolver> g_noop_resolver;
43
44UserIDResolver &UserIDResolver::GetNoopResolver() { return *g_noop_resolver; }
45