commit 16e84cc1e1c8e1b02f646226e38cdc091c3f9a1a
author James Hawkins <jhawkins@google.com> Thu Apr 14 14:13:20 2016 -0700
committer James Hawkins <jhawkins@google.com> Mon Aug 15 14:52:29 2016 -0700
tree 7642925e2b38b4a873477a01a521d7ecf7f07721
parent c1167dd4c96a1638a5e5bb163d225abb99b15816

bootstat: Calculate and log the time_since_last_boot metric.

Bug: 28163811
Change-Id: I2e1350531f6a0fc891c270cfdfca6c8ad63f8040
(cherry picked from commit 2d8b3e66c6fd298bc8f4dc4e8205bb469a89a6f8)

bootstat/bootstat.cpp

diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index 26e0ffc..d547c19 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -169,7 +169,19 @@
 void RecordBootComplete() {
   BootEventRecordStore boot_event_store;
   BootEventRecordStore::BootEventRecord record;
+
   time_t uptime = bootstat::ParseUptime();
+  time_t current_time_utc = time(nullptr);
+
+  if (boot_event_store.GetBootEvent("last_boot_time_utc", &record)) {
+    time_t last_boot_time_utc = record.second;
+    time_t time_since_last_boot = difftime(current_time_utc,
+                                           last_boot_time_utc);
+    boot_event_store.AddBootEventWithValue("time_since_last_boot",
+                                           time_since_last_boot);
+  }
+
+  boot_event_store.AddBootEventWithValue("last_boot_time_utc", current_time_utc);
 
   // The boot_complete metric has two variants: boot_complete and
   // ota_boot_complete.  The latter signifies that the device is booting after