Generate build timing metrics to proto format file

Test: Dumped the text formated based metrics file to out dir,
and checked the file.
Bug: b/63815990

Change-Id: Iff476f72a0be74eb53b6b26ef468d11c0f24a404
diff --git a/ui/metrics/metrics.go b/ui/metrics/metrics.go
new file mode 100644
index 0000000..790b67a
--- /dev/null
+++ b/ui/metrics/metrics.go
@@ -0,0 +1,161 @@
+// Copyright 2018 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 metrics
+
+import (
+	"io/ioutil"
+	"os"
+	"strconv"
+
+	"android/soong/ui/metrics/metrics_proto"
+
+	"github.com/golang/protobuf/proto"
+)
+
+const (
+	RunSetupTool = "setup"
+	RunKati      = "kati"
+	RunSoong     = "soong"
+	PrimaryNinja = "ninja"
+	TestRun      = "test"
+)
+
+type Metrics struct {
+	metrics    metrics_proto.MetricsBase
+	TimeTracer TimeTracer
+}
+
+func New() (metrics *Metrics) {
+	m := &Metrics{
+		metrics:    metrics_proto.MetricsBase{},
+		TimeTracer: &timeTracerImpl{},
+	}
+	return m
+}
+
+func (m *Metrics) SetTimeMetrics(perf metrics_proto.PerfInfo) {
+	switch perf.GetName() {
+	case RunKati:
+		m.metrics.KatiRuns = append(m.metrics.KatiRuns, &perf)
+		break
+	case RunSoong:
+		m.metrics.SoongRuns = append(m.metrics.SoongRuns, &perf)
+		break
+	case PrimaryNinja:
+		m.metrics.NinjaRuns = append(m.metrics.NinjaRuns, &perf)
+		break
+	default:
+		// ignored
+	}
+}
+
+func (m *Metrics) SetMetadataMetrics(metadata map[string]string) {
+	for k, v := range metadata {
+		switch k {
+		case "BUILD_ID":
+			m.metrics.BuildId = proto.String(v)
+			break
+		case "PLATFORM_VERSION_CODENAME":
+			m.metrics.PlatformVersionCodename = proto.String(v)
+			break
+		case "TARGET_PRODUCT":
+			m.metrics.TargetProduct = proto.String(v)
+			break
+		case "TARGET_BUILD_VARIANT":
+			switch v {
+			case "user":
+				m.metrics.TargetBuildVariant = metrics_proto.MetricsBase_USER.Enum()
+			case "userdebug":
+				m.metrics.TargetBuildVariant = metrics_proto.MetricsBase_USERDEBUG.Enum()
+			case "eng":
+				m.metrics.TargetBuildVariant = metrics_proto.MetricsBase_ENG.Enum()
+			default:
+				// ignored
+			}
+		case "TARGET_ARCH":
+			m.metrics.TargetArch = m.getArch(v)
+		case "TARGET_ARCH_VARIANT":
+			m.metrics.TargetArchVariant = proto.String(v)
+		case "TARGET_CPU_VARIANT":
+			m.metrics.TargetCpuVariant = proto.String(v)
+		case "HOST_ARCH":
+			m.metrics.HostArch = m.getArch(v)
+		case "HOST_2ND_ARCH":
+			m.metrics.Host_2NdArch = m.getArch(v)
+		case "HOST_OS":
+			m.metrics.HostOs = proto.String(v)
+		case "HOST_OS_EXTRA":
+			m.metrics.HostOsExtra = proto.String(v)
+		case "HOST_CROSS_OS":
+			m.metrics.HostCrossOs = proto.String(v)
+		case "HOST_CROSS_ARCH":
+			m.metrics.HostCrossArch = proto.String(v)
+		case "HOST_CROSS_2ND_ARCH":
+			m.metrics.HostCross_2NdArch = proto.String(v)
+		case "OUT_DIR":
+			m.metrics.OutDir = proto.String(v)
+		default:
+			// ignored
+		}
+	}
+}
+
+func (m *Metrics) getArch(arch string) *metrics_proto.MetricsBase_ARCH {
+	switch arch {
+	case "arm":
+		return metrics_proto.MetricsBase_ARM.Enum()
+	case "arm64":
+		return metrics_proto.MetricsBase_ARM64.Enum()
+	case "x86":
+		return metrics_proto.MetricsBase_X86.Enum()
+	case "x86_64":
+		return metrics_proto.MetricsBase_X86_64.Enum()
+	default:
+		return metrics_proto.MetricsBase_UNKNOWN.Enum()
+	}
+}
+
+func (m *Metrics) SetBuildDateTime(date_time string) {
+	if date_time != "" {
+		date_time_timestamp, err := strconv.ParseInt(date_time, 10, 64)
+		if err != nil {
+			panic(err)
+		}
+		m.metrics.BuildDateTimestamp = &date_time_timestamp
+	}
+}
+
+func (m *Metrics) Serialize() (data []byte, err error) {
+	return proto.Marshal(&m.metrics)
+}
+
+// exports the output to the file at outputPath
+func (m *Metrics) Dump(outputPath string) (err error) {
+	data, err := m.Serialize()
+	if err != nil {
+		return err
+	}
+	tempPath := outputPath + ".tmp"
+	err = ioutil.WriteFile(tempPath, []byte(data), 0777)
+	if err != nil {
+		return err
+	}
+	err = os.Rename(tempPath, outputPath)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}