3 files changed, 69 insertions, 3 deletions
diff --git a/src/buildtool/execution_api/common/TARGETS b/src/buildtool/execution_api/common/TARGETS
index 4a9c60e1..1d0431f0 100644
--- a/src/buildtool/execution_api/common/TARGETS
+++ b/src/buildtool/execution_api/common/TARGETS
@@ -7,18 +7,20 @@
     , "execution_action.hpp"
     , "execution_response.hpp"
     ]
+  , "srcs": ["execution_api.cpp"]
   , "deps":
     [ ["@", "gsl", "", "gsl"]
     , ["src/buildtool/common", "common"]
     , ["src/buildtool/crypto", "hash_function"]
     , ["src/buildtool/execution_api/bazel_msg", "bazel_msg"]
     , ["src/buildtool/execution_api/bazel_msg", "bazel_msg_factory"]
-    , ["src/utils/cpp", "hex_string"]
-    , ["src/utils/cpp", "gsl"]
+    , ["src/buildtool/file_system", "file_system_manager"]
+    , ["src/buildtool/file_system", "object_type"]
     , ["src/buildtool/logging", "logging"]
+    , ["src/utils/cpp", "gsl"]
+    , ["src/utils/cpp", "hex_string"]
     ]
   , "stage": ["src", "buildtool", "execution_api", "common"]
-  , "private-deps": [["src/buildtool/file_system", "object_type"]]
   }
 , "bytestream-common":
   { "type": ["@", "rules", "CC", "library"]
diff --git a/src/buildtool/execution_api/common/execution_api.cpp b/src/buildtool/execution_api/common/execution_api.cpp
new file mode 100644
index 00000000..f91dee43
--- /dev/null
+++ b/src/buildtool/execution_api/common/execution_api.cpp
@@ -0,0 +1,56 @@
+// Copyright 2023 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/common/execution_api.hpp"
+
+#include "src/buildtool/execution_api/bazel_msg/bazel_blob_container.hpp"
+#include "src/buildtool/file_system/file_system_manager.hpp"
+
+#include <gsl/gsl>
+
+[[nodiscard]] auto IExecutionApi::UploadFile(
+    std::filesystem::path const& file_path,
+    ObjectType type) noexcept -> bool {
+    auto data = FileSystemManager::ReadFile(file_path);
+    if (not data) {
+        return false;
+    }
+    ArtifactDigest digest{};
+    switch (type) {
+        case ObjectType::File:
+            digest = ArtifactDigest::Create<ObjectType::File>(*data);
+            break;
+        case ObjectType::Executable:
+            digest = ArtifactDigest::Create<ObjectType::Executable>(*data);
+            break;
+        case ObjectType::Tree:
+            digest = ArtifactDigest::Create<ObjectType::Tree>(*data);
+            break;
+        case ObjectType::Symlink:
+            digest = ArtifactDigest::Create<ObjectType::Symlink>(*data);
+            break;
+        default:
+            Ensures(false);  // unreachable
+            return false;
+    }
+    BlobContainer container{};
+    try {
+        auto exec = IsExecutableObject(type);
+        container.Emplace(BazelBlob{digest, *data, exec});
+    } catch (std::exception const& ex) {
+        Logger::Log(LogLevel::Error, "failed to emplace blob: ", ex.what());
+        return false;
+    }
+    return Upload(container);
+}
diff --git a/src/buildtool/execution_api/common/execution_api.hpp b/src/buildtool/execution_api/common/execution_api.hpp
index 37abd5ea..d6ec49fb 100644
--- a/src/buildtool/execution_api/common/execution_api.hpp
+++ b/src/buildtool/execution_api/common/execution_api.hpp
@@ -15,6 +15,7 @@
 #ifndef INCLUDED_SRC_BUILDTOOL_EXECUTION_API_COMMON_EXECUTION_APIHPP
 #define INCLUDED_SRC_BUILDTOOL_EXECUTION_API_COMMON_EXECUTION_APIHPP
 
+#include <filesystem>
 #include <map>
 #include <memory>
 #include <optional>
@@ -27,6 +28,7 @@
 #include "src/buildtool/execution_api/bazel_msg/bazel_blob_container.hpp"
 #include "src/buildtool/execution_api/bazel_msg/bazel_msg_factory.hpp"
 #include "src/buildtool/execution_api/common/execution_action.hpp"
+#include "src/buildtool/file_system/object_type.hpp"
 
 /// \brief Abstract remote execution API
 /// Can be used to create actions.
@@ -116,6 +118,12 @@ class IExecutionApi {
                                       bool skip_find_missing = false) noexcept
         -> bool = 0;
 
+    /// \brief Upload a file to CAS as an object of the specified type.
+    /// It may be assumed that the file is owned entirely by the build process.
+    [[nodiscard]] virtual auto UploadFile(
+        std::filesystem::path const& file_path,
+        ObjectType type) noexcept -> bool;
+
     [[nodiscard]] virtual auto UploadTree(
         std::vector<DependencyGraph::NamedArtifactNodePtr> const&
             artifacts) noexcept -> std::optional<ArtifactDigest> = 0;