1 files changed, 49 insertions, 0 deletions
diff --git a/src/buildtool/storage/target_cache_key.cpp b/src/buildtool/storage/target_cache_key.cpp
new file mode 100644
index 00000000..11ea5c84
--- /dev/null
+++ b/src/buildtool/storage/target_cache_key.cpp
@@ -0,0 +1,49 @@
+// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/buildtool/storage/target_cache_key.hpp"
+
+#include <exception>
+
+#include <nlohmann/json.hpp>
+
+#include "src/buildtool/common/artifact_digest.hpp"
+#include "src/buildtool/file_system/object_type.hpp"
+#include "src/buildtool/logging/log_level.hpp"
+#include "src/buildtool/logging/logger.hpp"
+#include "src/buildtool/storage/storage.hpp"
+
+auto TargetCacheKey::Create(std::string const& repo_key,
+                            BuildMaps::Base::NamedTarget const& target_name,
+                            Configuration const& effective_config) noexcept
+    -> std::optional<TargetCacheKey> {
+    try {
+        // target's repository is content-fixed, we can compute a cache key
+        auto target_desc = nlohmann::json{
+            {{"repo_key", repo_key},
+             {"target_name",
+              nlohmann::json{target_name.module, target_name.name}.dump()},
+             {"effective_config", effective_config.ToString()}}};
+        if (auto target_key = Storage::Instance().CAS().StoreBlob(
+                target_desc.dump(2), /*is_executable=*/false)) {
+            return TargetCacheKey{
+                {ArtifactDigest{*target_key}, ObjectType::File}};
+        }
+    } catch (std::exception const& ex) {
+        Logger::Log(LogLevel::Error,
+                    "Creating target cache key failed with:\n{}",
+                    ex.what());
+    }
+    return std::nullopt;
+}