Factor out the metrics transmission logic

This new file will be the home of related metrics transmission logic
from `host/libs/metrics/send`.

Bug: 452136634

Author: cjreynol

base/cvd/cuttlefish/host/libs/metrics/BUILD.bazel

@@ -79,10 +79,9 @@ cf_cc_library(
         "//cuttlefish/common/libs/utils:result",
         "//cuttlefish/host/commands/cvd/instances",
         "//cuttlefish/host/commands/cvd/metrics:is_enabled",
-        "//cuttlefish/host/commands/metrics:send",
         "//cuttlefish/host/libs/metrics:event_type",
         "//cuttlefish/host/libs/metrics:metrics_conversion",
-        "//cuttlefish/host/libs/metrics:metrics_headers",
+        "//cuttlefish/host/libs/metrics:metrics_transmitter",
         "//cuttlefish/host/libs/metrics:metrics_writer",
         "//cuttlefish/host/libs/metrics:session_id",
         "//external_proto:clientanalytics_cc_proto",
@@ -91,6 +90,22 @@ cf_cc_library(
     ],
 )
 
+cf_cc_library(
+    name = "metrics_transmitter",
+    srcs = [
+        "metrics_transmitter.cc",
+    ],
+    hdrs = [
+        "metrics_transmitter.h",
+    ],
+    deps = [
+        "//cuttlefish/common/libs/utils:result",
+        "//cuttlefish/host/commands/metrics:send",
+        "//cuttlefish/host/libs/metrics:metrics_headers",
+        "//external_proto:clientanalytics_cc_proto",
+    ],
+)
+
 cf_cc_library(
     name = "metrics_writer",
     srcs = [

base/cvd/cuttlefish/host/libs/metrics/metrics_orchestration.cc

@@ -26,10 +26,9 @@
 #include "cuttlefish/common/libs/utils/result.h"
 #include "cuttlefish/host/commands/cvd/instances/instance_group_record.h"
 #include "cuttlefish/host/commands/cvd/metrics/is_enabled.h"
-#include "cuttlefish/host/commands/metrics/send.h"
 #include "cuttlefish/host/libs/metrics/event_type.h"
 #include "cuttlefish/host/libs/metrics/metrics_conversion.h"
-#include "cuttlefish/host/libs/metrics/metrics_defs.h"
+#include "cuttlefish/host/libs/metrics/metrics_transmitter.h"
 #include "cuttlefish/host/libs/metrics/metrics_writer.h"
 #include "cuttlefish/host/libs/metrics/session_id.h"
 #include "external_proto/clientanalytics.pb.h"
@@ -59,14 +58,6 @@ Result<void> SetUpMetrics(const std::string& metrics_directory) {
   return {};
 }
 
-Result<void> TransmitMetrics(const LogRequest& log_request) {
-  int reporting_outcome = metrics::PostRequest(log_request.SerializeAsString(),
-                                               metrics::ClearcutServer::kProd);
-  CF_EXPECTF(reporting_outcome != MetricsExitCodes::kSuccess,
-             "Issue reporting metrics: {}", reporting_outcome);
-  return {};
-}
-
 Result<void> GatherAndWriteMetrics(EventType event_type,
                                    const std::string& metrics_directory) {
   const std::string session_id =
@@ -81,7 +72,7 @@ Result<void> GatherAndWriteMetrics(EventType event_type,
     LOG(INFO) << "This will automatically send diagnostic information to "
                  "Google, such as crash reports and usage data from the host "
                  "machine managing the Android Virtual Device.";
-    CF_EXPECT(TransmitMetrics(log_request));
+    CF_EXPECT(TransmitMetricsEvent(log_request));
   }
   return {};
 }

base/cvd/cuttlefish/host/libs/metrics/metrics_transmitter.cc

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * 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 "cuttlefish/host/libs/metrics/metrics_transmitter.h"
+
+#include "cuttlefish/common/libs/utils/result.h"
+#include "cuttlefish/host/commands/metrics/send.h"
+#include "cuttlefish/host/libs/metrics/metrics_defs.h"
+#include "external_proto/clientanalytics.pb.h"
+
+namespace cuttlefish {
+
+Result<void> TransmitMetricsEvent(
+    const wireless_android_play_playlog::LogRequest& log_request) {
+  int reporting_outcome = metrics::PostRequest(log_request.SerializeAsString(),
+                                               metrics::ClearcutServer::kProd);
+  CF_EXPECTF(reporting_outcome != MetricsExitCodes::kSuccess,
+             "Issue reporting metrics: {}", reporting_outcome);
+  return {};
+}
+
+}  // namespace cuttlefish

base/cvd/cuttlefish/host/libs/metrics/metrics_transmitter.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include "cuttlefish/common/libs/utils/result.h"
+#include "external_proto/clientanalytics.pb.h"
+
+namespace cuttlefish {
+
+Result<void> TransmitMetricsEvent(
+    const wireless_android_play_playlog::LogRequest& log_request);
+
+}  // namespace cuttlefish