1 files changed, 87 insertions, 0 deletions
diff --git a/android/metrics.go b/android/metrics.go
new file mode 100644
index 000000000..b7aee5466
--- /dev/null
+++ b/android/metrics.go
@@ -0,0 +1,87 @@
+// Copyright 2020 Google Inc. All rights reserved.
+//
+// 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.
+
+package android
+
+import (
+	"io/ioutil"
+	"runtime"
+
+	"github.com/golang/protobuf/proto"
+
+	soong_metrics_proto "android/soong/ui/metrics/metrics_proto"
+)
+
+var soongMetricsOnceKey = NewOnceKey("soong metrics")
+
+type SoongMetrics struct {
+	Modules  int
+	Variants int
+}
+
+func ReadSoongMetrics(config Config) SoongMetrics {
+	return config.Get(soongMetricsOnceKey).(SoongMetrics)
+}
+
+func init() {
+	RegisterSingletonType("soong_metrics", soongMetricsSingletonFactory)
+}
+
+func soongMetricsSingletonFactory() Singleton { return soongMetricsSingleton{} }
+
+type soongMetricsSingleton struct{}
+
+func (soongMetricsSingleton) GenerateBuildActions(ctx SingletonContext) {
+	metrics := SoongMetrics{}
+	ctx.VisitAllModules(func(m Module) {
+		if ctx.PrimaryModule(m) == m {
+			metrics.Modules++
+		}
+		metrics.Variants++
+	})
+	ctx.Config().Once(soongMetricsOnceKey, func() interface{} {
+		return metrics
+	})
+}
+
+func collectMetrics(config Config) *soong_metrics_proto.SoongBuildMetrics {
+	metrics := &soong_metrics_proto.SoongBuildMetrics{}
+
+	soongMetrics := ReadSoongMetrics(config)
+	metrics.Modules = proto.Uint32(uint32(soongMetrics.Modules))
+	metrics.Variants = proto.Uint32(uint32(soongMetrics.Variants))
+
+	memStats := runtime.MemStats{}
+	runtime.ReadMemStats(&memStats)
+	metrics.MaxHeapSize = proto.Uint64(memStats.HeapSys)
+	metrics.TotalAllocCount = proto.Uint64(memStats.Mallocs)
+	metrics.TotalAllocSize = proto.Uint64(memStats.TotalAlloc)
+
+	return metrics
+}
+
+func WriteMetrics(config Config, metricsFile string) error {
+	metrics := collectMetrics(config)
+
+	buf, err := proto.Marshal(metrics)
+	if err != nil {
+		return err
+	}
+	err = ioutil.WriteFile(absolutePath(metricsFile), buf, 0666)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}