Move metrics from namespace to class

Add a new metrics reporter interface to handle the current metrics
report for omaha (with metricsd). This helps to add metrics logging
for android phone devices (using other libraries) in the future.

Also change the unit tests accordingly.

Test: unit tests pass for pico
Change-Id: I703c8b6353e4b38bc89d6a71f01623978cf7a549
diff --git a/metrics_reporter_interface.h b/metrics_reporter_interface.h
new file mode 100644
index 0000000..458d98e
--- /dev/null
+++ b/metrics_reporter_interface.h
@@ -0,0 +1,185 @@
+//
+// Copyright (C) 2017 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.
+//
+
+#ifndef UPDATE_ENGINE_METRICS_REPORTER_INTERFACE_H_
+#define UPDATE_ENGINE_METRICS_REPORTER_INTERFACE_H_
+
+#include <base/time/time.h>
+
+#include "update_engine/certificate_checker.h"
+#include "update_engine/common/constants.h"
+#include "update_engine/common/error_code.h"
+#include "update_engine/metrics_constants.h"
+#include "update_engine/system_state.h"
+
+namespace chromeos_update_engine {
+
+class MetricsReporterInterface {
+ public:
+  virtual ~MetricsReporterInterface() = default;
+
+  virtual void Initialize() = 0;
+
+  // Helper function to report metrics related to rollback. The
+  // following metrics are reported:
+  //
+  //  |kMetricRollbackResult|
+  virtual void ReportRollbackMetrics(metrics::RollbackResult result) = 0;
+
+  // Helper function to report metrics reported once a day. The
+  // following metrics are reported:
+  //
+  //  |kMetricDailyOSAgeDays|
+  virtual void ReportDailyMetrics(base::TimeDelta os_age) = 0;
+
+  // Helper function to report metrics after completing an update check
+  // with the ChromeOS update server ("Omaha"). The following metrics
+  // are reported:
+  //
+  //  |kMetricCheckResult|
+  //  |kMetricCheckReaction|
+  //  |kMetricCheckDownloadErrorCode|
+  //  |kMetricCheckTimeSinceLastCheckMinutes|
+  //  |kMetricCheckTimeSinceLastCheckUptimeMinutes|
+  //
+  // The |kMetricCheckResult| metric will only be reported if |result|
+  // is not |kUnset|.
+  //
+  // The |kMetricCheckReaction| metric will only be reported if
+  // |reaction| is not |kUnset|.
+  //
+  // The |kMetricCheckDownloadErrorCode| will only be reported if
+  // |download_error_code| is not |kUnset|.
+  //
+  // The values for the |kMetricCheckTimeSinceLastCheckMinutes| and
+  // |kMetricCheckTimeSinceLastCheckUptimeMinutes| metrics are
+  // automatically reported and calculated by maintaining persistent
+  // and process-local state variables.
+  virtual void ReportUpdateCheckMetrics(
+      SystemState* system_state,
+      metrics::CheckResult result,
+      metrics::CheckReaction reaction,
+      metrics::DownloadErrorCode download_error_code) = 0;
+
+  // Helper function to report metrics after the completion of each
+  // update attempt. The following metrics are reported:
+  //
+  //  |kMetricAttemptNumber|
+  //  |kMetricAttemptPayloadType|
+  //  |kMetricAttemptPayloadSizeMiB|
+  //  |kMetricAttemptDurationSeconds|
+  //  |kMetricAttemptDurationUptimeSeconds|
+  //  |kMetricAttemptTimeSinceLastAttemptMinutes|
+  //  |kMetricAttemptTimeSinceLastAttemptUptimeMinutes|
+  //  |kMetricAttemptPayloadBytesDownloadedMiB|
+  //  |kMetricAttemptPayloadDownloadSpeedKBps|
+  //  |kMetricAttemptDownloadSource|
+  //  |kMetricAttemptResult|
+  //  |kMetricAttemptInternalErrorCode|
+  //  |kMetricAttemptDownloadErrorCode|
+  //
+  // The |kMetricAttemptInternalErrorCode| metric will only be reported
+  // if |internal_error_code| is not |kErrorSuccess|.
+  //
+  // The |kMetricAttemptDownloadErrorCode| metric will only be
+  // reported if |payload_download_error_code| is not |kUnset|.
+  //
+  // The values for the |kMetricAttemptTimeSinceLastAttemptMinutes| and
+  // |kMetricAttemptTimeSinceLastAttemptUptimeMinutes| metrics are
+  // automatically calculated and reported by maintaining persistent and
+  // process-local state variables.
+  virtual void ReportUpdateAttemptMetrics(
+      SystemState* system_state,
+      int attempt_number,
+      PayloadType payload_type,
+      base::TimeDelta duration,
+      base::TimeDelta duration_uptime,
+      int64_t payload_size,
+      int64_t payload_bytes_downloaded,
+      int64_t payload_download_speed_bps,
+      DownloadSource download_source,
+      metrics::AttemptResult attempt_result,
+      ErrorCode internal_error_code,
+      metrics::DownloadErrorCode payload_download_error_code,
+      metrics::ConnectionType connection_type) = 0;
+
+  // Reports the |kAbnormalTermination| for the |kMetricAttemptResult|
+  // metric. No other metrics in the UpdateEngine.Attempt.* namespace
+  // will be reported.
+  virtual void ReportAbnormallyTerminatedUpdateAttemptMetrics() = 0;
+
+  // Helper function to report the after the completion of a successful
+  // update attempt. The following metrics are reported:
+  //
+  //  |kMetricSuccessfulUpdateAttemptCount|
+  //  |kMetricSuccessfulUpdateUpdatesAbandonedCount|
+  //  |kMetricSuccessfulUpdatePayloadType|
+  //  |kMetricSuccessfulUpdatePayloadSizeMiB|
+  //  |kMetricSuccessfulUpdateBytesDownloadedMiBHttpsServer|
+  //  |kMetricSuccessfulUpdateBytesDownloadedMiBHttpServer|
+  //  |kMetricSuccessfulUpdateBytesDownloadedMiBHttpPeer|
+  //  |kMetricSuccessfulUpdateBytesDownloadedMiB|
+  //  |kMetricSuccessfulUpdateDownloadSourcesUsed|
+  //  |kMetricSuccessfulUpdateDownloadOverheadPercentage|
+  //  |kMetricSuccessfulUpdateTotalDurationMinutes|
+  //  |kMetricSuccessfulUpdateRebootCount|
+  //  |kMetricSuccessfulUpdateUrlSwitchCount|
+  //
+  // The values for the |kMetricSuccessfulUpdateDownloadSourcesUsed| are
+  // |kMetricSuccessfulUpdateBytesDownloadedMiB| metrics automatically
+  // calculated from examining the |num_bytes_downloaded| array.
+  virtual void ReportSuccessfulUpdateMetrics(
+      int attempt_count,
+      int updates_abandoned_count,
+      PayloadType payload_type,
+      int64_t payload_size,
+      int64_t num_bytes_downloaded[kNumDownloadSources],
+      int download_overhead_percentage,
+      base::TimeDelta total_duration,
+      int reboot_count,
+      int url_switch_count) = 0;
+
+  // Helper function to report the after the completion of a SSL certificate
+  // check. One of the following metrics is reported:
+  //
+  //  |kMetricCertificateCheckUpdateCheck|
+  //  |kMetricCertificateCheckDownload|
+  virtual void ReportCertificateCheckMetrics(ServerToCheck server_to_check,
+                                             CertificateCheckResult result) = 0;
+
+  // Helper function to report the number failed update attempts. The following
+  // metrics are reported:
+  //
+  // |kMetricFailedUpdateCount|
+  virtual void ReportFailedUpdateCount(int target_attempt) = 0;
+
+  // Helper function to report the time interval in minutes between a
+  // successful update and the reboot into the updated system. The following
+  // metrics are reported:
+  //
+  // |kMetricTimeToRebootMinutes|
+  virtual void ReportTimeToReboot(int time_to_reboot_minutes) = 0;
+
+  // Helper function to report the source of installation data. The following
+  // metrics are reported:
+  //
+  // |kMetricInstallDateProvisioningSource|
+  virtual void ReportInstallDateProvisioningSource(int source, int max) = 0;
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_METRICS_REPORTER_INTERFACE_H_