1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "host/commands/cvd/flag.h"
18
19 #include "host/commands/cvd/common_utils.h"
20
21 namespace cuttlefish {
22
Name() const23 Result<std::string> CvdFlagProxy::Name() const {
24 CF_EXPECT(GetType() != FlagType::kUnknown, "Unsupported flag type");
25 auto decode_name = Overload{
26 [](auto&& param) -> std::string { return param.Name(); },
27 };
28 return std::visit(decode_name, flag_);
29 }
30
GetType() const31 CvdFlagProxy::FlagType CvdFlagProxy::GetType() const {
32 auto decode_type = Overload{
33 [](const CvdFlag<bool>&) -> FlagType { return FlagType::kBool; },
34 [](const CvdFlag<std::int32_t>&) -> FlagType { return FlagType::kInt32; },
35 [](const CvdFlag<std::string>&) -> FlagType { return FlagType::kString; },
36 [](auto) -> FlagType { return FlagType::kUnknown; },
37 };
38 return std::visit(decode_type, flag_);
39 }
40
HasDefaultValue() const41 Result<bool> CvdFlagProxy::HasDefaultValue() const {
42 CF_EXPECT(GetType() != FlagType::kUnknown, "Unsupported flag type of typeid");
43 auto decode_default_value = Overload{
44 [](auto&& flag) -> bool { return flag.HasDefaultValue(); },
45 };
46 return std::visit(decode_default_value, flag_);
47 }
48
Flags() const49 std::vector<CvdFlagProxy> FlagCollection::Flags() const {
50 std::vector<CvdFlagProxy> flags;
51 flags.reserve(name_flag_map_.size());
52 for (const auto& [name, flag] : name_flag_map_) {
53 flags.push_back(flag);
54 }
55 return flags;
56 }
57
58 template <typename T>
FilterKnownTypeFlag(const CvdFlag<T> & flag,cvd_common::Args & args)59 static Result<std::optional<CvdFlagProxy::ValueVariant>> FilterKnownTypeFlag(
60 const CvdFlag<T>& flag, cvd_common::Args& args) {
61 std::optional<T> opt = CF_EXPECT(flag.FilterFlag(args));
62 if (!opt) {
63 return std::nullopt;
64 }
65 CvdFlagProxy::ValueVariant value_variant = *opt;
66 return value_variant;
67 }
68
FilterFlag(cvd_common::Args & args) const69 Result<std::optional<CvdFlagProxy::ValueVariant>> CvdFlagProxy::FilterFlag(
70 cvd_common::Args& args) const {
71 CF_EXPECT(GetType() != FlagType::kUnknown, "Unsupported flag type of typeid");
72 std::optional<CvdFlagProxy::ValueVariant> output;
73 auto filter_flag = Overload{
74 [&args](const CvdFlag<std::int32_t>& int32_t_flag)
75 -> Result<std::optional<ValueVariant>> {
76 return FilterKnownTypeFlag(int32_t_flag, args);
77 },
78 [&args](const CvdFlag<bool>& bool_flag)
79 -> Result<std::optional<ValueVariant>> {
80 return FilterKnownTypeFlag(bool_flag, args);
81 },
82 [&args](const CvdFlag<std::string>& string_flag)
83 -> Result<std::optional<ValueVariant>> {
84 return FilterKnownTypeFlag(string_flag, args);
85 },
86 [](auto) -> Result<std::optional<ValueVariant>> {
87 return CF_ERR("Invalid type is passed to FlagCollection::FilterFlags");
88 },
89 };
90 output = CF_EXPECT(std::visit(filter_flag, flag_));
91 return output;
92 }
93
94 Result<std::unordered_map<std::string, FlagCollection::FlagValuePair>>
FilterFlags(cvd_common::Args & args) const95 FlagCollection::FilterFlags(cvd_common::Args& args) const {
96 std::unordered_map<std::string, FlagCollection::FlagValuePair> output;
97 for (const auto& [name, flag_proxy] : name_flag_map_) {
98 auto value_opt = CF_EXPECT(flag_proxy.FilterFlag(args));
99 if (!value_opt) {
100 continue;
101 }
102 output.emplace(name,
103 FlagValuePair{.flag = flag_proxy, .value = *value_opt});
104 }
105 return output;
106 }
107
108 Result<std::unordered_map<std::string, FlagCollection::FlagValuePair>>
CalculateFlags(cvd_common::Args & args) const109 FlagCollection::CalculateFlags(cvd_common::Args& args) const {
110 auto output = CF_EXPECT(FilterFlags(args));
111 for (const auto& [name, flag_proxy] : name_flag_map_) {
112 if (Contains(output, name)) {
113 // the flag was given with a value, there is no need for update it
114 continue;
115 }
116 if (!CF_EXPECT(flag_proxy.HasDefaultValue())) {
117 continue;
118 }
119 switch (flag_proxy.GetType()) {
120 case CvdFlagProxy::FlagType::kBool:
121 output.emplace(
122 name,
123 FlagValuePair{.flag = flag_proxy,
124 .value = CF_EXPECT(flag_proxy.DefaultValue<bool>())});
125 break;
126 case CvdFlagProxy::FlagType::kInt32:
127 output.emplace(
128 name, FlagValuePair{.flag = flag_proxy,
129 .value = CF_EXPECT(
130 flag_proxy.DefaultValue<std::int32_t>())});
131 break;
132 case CvdFlagProxy::FlagType::kString:
133 output.emplace(
134 name, FlagValuePair{.flag = flag_proxy,
135 .value = CF_EXPECT(
136 flag_proxy.DefaultValue<std::string>())});
137 break;
138 default:
139 return CF_ERR("Unsupported FlagType in "
140 << "--" << name);
141 }
142 }
143 return output;
144 }
145
146 } // namespace cuttlefish
147