1 files changed, 66 insertions, 0 deletions
diff --git a/src/buildtool/execution_api/local/local_cas_reader.cpp b/src/buildtool/execution_api/local/local_cas_reader.cpp
new file mode 100644
index 00000000..411bc5d7
--- /dev/null
+++ b/src/buildtool/execution_api/local/local_cas_reader.cpp
@@ -0,0 +1,66 @@
+// Copyright 2024 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/execution_api/local/local_cas_reader.hpp"
+
+#include "src/buildtool/crypto/hash_function.hpp"
+#include "src/buildtool/execution_api/bazel_msg/bazel_msg_factory.hpp"
+#include "src/buildtool/file_system/file_system_manager.hpp"
+#include "src/buildtool/logging/log_level.hpp"
+#include "src/buildtool/logging/logger.hpp"
+#include "src/utils/cpp/path.hpp"
+
+auto LocalCasReader::ReadDirectory(ArtifactDigest const& digest) const noexcept
+    -> std::optional<bazel_re::Directory> {
+    if (auto const path = cas_.TreePath(digest)) {
+        if (auto const content = FileSystemManager::ReadFile(*path)) {
+            return BazelMsgFactory::MessageFromString<bazel_re::Directory>(
+                *content);
+        }
+    }
+    Logger::Log(
+        LogLevel::Error, "Directory {} not found in CAS", digest.hash());
+    return std::nullopt;
+}
+
+auto LocalCasReader::ReadGitTree(ArtifactDigest const& digest) const noexcept
+    -> std::optional<GitRepo::tree_entries_t> {
+    if (auto const path = cas_.TreePath(digest)) {
+        if (auto const content = FileSystemManager::ReadFile(*path)) {
+            auto check_symlinks =
+                [this](std::vector<bazel_re::Digest> const& ids) {
+                    for (auto const& id : ids) {
+                        auto link_path = cas_.BlobPath(id,
+                                                       /*is_executable=*/false);
+                        if (not link_path) {
+                            return false;
+                        }
+                        // in the local CAS we store as files
+                        auto content = FileSystemManager::ReadFile(*link_path);
+                        if (not content or not PathIsNonUpwards(*content)) {
+                            return false;
+                        }
+                    }
+                    return true;
+                };
+            return GitRepo::ReadTreeData(
+                *content,
+                HashFunction::ComputeTreeHash(*content).Bytes(),
+                check_symlinks,
+                /*is_hex_id=*/false);
+        }
+    }
+    Logger::Log(LogLevel::Debug, "Tree {} not found in CAS", digest.hash());
+    return std::nullopt;
+}