Collect metrics for android update attempt

Report the update attempt/result metrics when an upate finishes;
and abnormally terminated updates/time to reboot when the device
reboots.

Bug: 30989466
Test: update_engine_unittest pass
Change-Id: Iea16b4e8003ae3dab5e9b7c65cf4b38d2219d203

1 files changed, 73 insertions, 1 deletions

diff --git a/metrics_utils.cc b/metrics_utils.cc
index 263bacd2..5cff2938 100644
--- a/metrics_utils.cc
+++ b/metrics_utils.cc
@@ -21,7 +21,8 @@
 #include <base/time/time.h>
 
 #include "update_engine/common/clock_interface.h"
-#include "update_engine/common/prefs_interface.h"
+#include "update_engine/common/constants.h"
+#include "update_engine/common/utils.h"
 #include "update_engine/system_state.h"
 
 using base::Time;
@@ -305,5 +306,76 @@ bool MonotonicDurationHelper(SystemState* system_state,
   return ret;
 }
 
+int64_t GetPersistedValue(const std::string& key, PrefsInterface* prefs) {
+  CHECK(prefs);
+  if (!prefs->Exists(key))
+    return 0;
+
+  int64_t stored_value;
+  if (!prefs->GetInt64(key, &stored_value))
+    return 0;
+
+  if (stored_value < 0) {
+    LOG(ERROR) << key << ": Invalid value (" << stored_value
+               << ") in persisted state. Defaulting to 0";
+    return 0;
+  }
+
+  return stored_value;
+}
+
+void SetNumReboots(int64_t num_reboots, PrefsInterface* prefs) {
+  CHECK(prefs);
+  prefs->SetInt64(kPrefsNumReboots, num_reboots);
+  LOG(INFO) << "Number of Reboots during current update attempt = "
+            << num_reboots;
+}
+
+void SetPayloadAttemptNumber(int64_t payload_attempt_number,
+                             PrefsInterface* prefs) {
+  CHECK(prefs);
+  prefs->SetInt64(kPrefsPayloadAttemptNumber, payload_attempt_number);
+  LOG(INFO) << "Payload Attempt Number = " << payload_attempt_number;
+}
+
+void SetSystemUpdatedMarker(ClockInterface* clock, PrefsInterface* prefs) {
+  CHECK(prefs);
+  CHECK(clock);
+  Time update_finish_time = clock->GetMonotonicTime();
+  prefs->SetInt64(kPrefsSystemUpdatedMarker,
+                  update_finish_time.ToInternalValue());
+  LOG(INFO) << "Updated Marker = " << utils::ToString(update_finish_time);
+}
+
+void SetUpdateTimestampStart(const Time& update_start_time,
+                             PrefsInterface* prefs) {
+  CHECK(prefs);
+  prefs->SetInt64(kPrefsUpdateTimestampStart,
+                  update_start_time.ToInternalValue());
+  LOG(INFO) << "Update Timestamp Start = "
+            << utils::ToString(update_start_time);
+}
+
+bool LoadAndReportTimeToReboot(MetricsReporterInterface* metrics_reporter,
+                               PrefsInterface* prefs,
+                               ClockInterface* clock) {
+  CHECK(prefs);
+  CHECK(clock);
+  int64_t stored_value = GetPersistedValue(kPrefsSystemUpdatedMarker, prefs);
+  if (stored_value == 0)
+    return false;
+
+  Time system_updated_at = Time::FromInternalValue(stored_value);
+  base::TimeDelta time_to_reboot =
+      clock->GetMonotonicTime() - system_updated_at;
+  if (time_to_reboot.ToInternalValue() < 0) {
+    LOG(ERROR) << "time_to_reboot is negative - system_updated_at: "
+               << utils::ToString(system_updated_at);
+    return false;
+  }
+  metrics_reporter->ReportTimeToReboot(time_to_reboot.InMinutes());
+  return true;
+}
+
 }  // namespace metrics_utils
 }  // namespace chromeos_update_engine