1*0b57cec5SDimitry Andric //===-- UserIDResolver.cpp ------------------------------------------------===//
2*0b57cec5SDimitry Andric //
3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*0b57cec5SDimitry Andric //
7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===//
8*0b57cec5SDimitry Andric 
9*0b57cec5SDimitry Andric #include "lldb/Utility/UserIDResolver.h"
10*0b57cec5SDimitry Andric #include "llvm/Support/ManagedStatic.h"
11*0b57cec5SDimitry Andric #include <optional>
12*0b57cec5SDimitry Andric 
13*0b57cec5SDimitry Andric using namespace lldb_private;
14*0b57cec5SDimitry Andric 
15*0b57cec5SDimitry Andric UserIDResolver::~UserIDResolver() = default;
16*0b57cec5SDimitry Andric 
Get(id_t id,Map & cache,std::optional<std::string> (UserIDResolver::* do_get)(id_t))17*0b57cec5SDimitry Andric std::optional<llvm::StringRef> UserIDResolver::Get(
18*0b57cec5SDimitry Andric     id_t id, Map &cache,
19*0b57cec5SDimitry Andric     std::optional<std::string> (UserIDResolver::*do_get)(id_t)) {
20*0b57cec5SDimitry Andric 
21*0b57cec5SDimitry Andric   std::lock_guard<std::mutex> guard(m_mutex);
22*0b57cec5SDimitry Andric   auto iter_bool = cache.try_emplace(id, std::nullopt);
23*0b57cec5SDimitry Andric   if (iter_bool.second)
24*0b57cec5SDimitry Andric     iter_bool.first->second = (this->*do_get)(id);
25*0b57cec5SDimitry Andric   if (iter_bool.first->second)
26*0b57cec5SDimitry Andric     return llvm::StringRef(*iter_bool.first->second);
27*0b57cec5SDimitry Andric   return std::nullopt;
28*0b57cec5SDimitry Andric }
29*0b57cec5SDimitry Andric 
30*0b57cec5SDimitry Andric namespace {
31*0b57cec5SDimitry Andric class NoopResolver : public UserIDResolver {
32*0b57cec5SDimitry Andric protected:
DoGetUserName(id_t uid)33*0b57cec5SDimitry Andric   std::optional<std::string> DoGetUserName(id_t uid) override {
34*0b57cec5SDimitry Andric     return std::nullopt;
35*0b57cec5SDimitry Andric   }
36*0b57cec5SDimitry Andric 
DoGetGroupName(id_t gid)37*0b57cec5SDimitry Andric   std::optional<std::string> DoGetGroupName(id_t gid) override {
38*0b57cec5SDimitry Andric     return std::nullopt;
39*0b57cec5SDimitry Andric   }
40*0b57cec5SDimitry Andric };
41*0b57cec5SDimitry Andric } // namespace
42*0b57cec5SDimitry Andric 
43*0b57cec5SDimitry Andric static llvm::ManagedStatic<NoopResolver> g_noop_resolver;
44*0b57cec5SDimitry Andric 
GetNoopResolver()45 UserIDResolver &UserIDResolver::GetNoopResolver() { return *g_noop_resolver; }
46