Split a MetricsLogStore object out of MetricsLogManager.

components/metrics/metrics_log_store_unittest.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/metrics/metrics_log_store.h"
+
+#include "components/metrics/metrics_pref_names.h"
+#include "components/metrics/test_metrics_service_client.h"
+#include "components/prefs/testing_pref_service.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace metrics {
+
+namespace {
+
+class MetricsLogStoreTest : public testing::Test {
+ public:
+  MetricsLogStoreTest() {
+    MetricsLogStore::RegisterPrefs(pref_service_.registry());
+  }
+  ~MetricsLogStoreTest() override {}
+
+  MetricsLog* CreateLog(MetricsLog::LogType log_type) {
+    return new MetricsLog("id", 0, log_type, &client_, &pref_service_);
+  }
+
+  // Returns the stored number of logs of the given type.
+  size_t TypeCount(MetricsLog::LogType log_type) {
+    int list_length = 0;
+    if (log_type == MetricsLog::INITIAL_STABILITY_LOG)
+      list_length =

[rkaplow, 2017/02/20 21:24:13]

I would just return pref_service_.Get(...) here, and then remove the else and
just return.

Or use type = log_type == MetricsLog::INITIAL_STABILITY_LOG ?
prefs::kMetricsInitialLogs : prefs::kMetricsOngoing
and return it that way

[Steven Holte, 2017/02/21 21:51:19]

Done.

+          pref_service_.GetList(prefs::kMetricsInitialLogs)->GetSize();
+    else
+      list_length =
+          pref_service_.GetList(prefs::kMetricsOngoingLogs)->GetSize();
+    return list_length;
+  }
+
+  TestMetricsServiceClient client_;
+  TestingPrefServiceSimple pref_service_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MetricsLogStoreTest);
+};
+
+}  // namespace
+
+TEST_F(MetricsLogStoreTest, StandardFlow) {
+  MetricsLogStore log_store(&pref_service_, 0);
+  log_store.LoadPersistedUnsentLogs();
+
+  // Make sure a new manager has a clean slate.
+  EXPECT_FALSE(log_store.has_staged_log());
+  EXPECT_FALSE(log_store.has_unsent_logs());
+
+  log_store.StoreLog("a", MetricsLog::ONGOING_LOG);
+  EXPECT_TRUE(log_store.has_unsent_logs());
+  EXPECT_FALSE(log_store.has_staged_log());
+
+  log_store.StageNextLog();
+  EXPECT_TRUE(log_store.has_staged_log());
+  EXPECT_FALSE(log_store.staged_log().empty());
+
+  log_store.DiscardStagedLog();
+  EXPECT_FALSE(log_store.has_staged_log());
+  EXPECT_FALSE(log_store.has_unsent_logs());
+}
+
+TEST_F(MetricsLogStoreTest, StoreAndLoad) {
+  // Set up some in-progress logging in a scoped log manager simulating the
+  // leadup to quitting, then persist as would be done on quit.
+  {
+    MetricsLogStore log_store(&pref_service_, 0);
+    log_store.LoadPersistedUnsentLogs();
+    EXPECT_FALSE(log_store.has_unsent_logs());
+    log_store.StoreLog("a", MetricsLog::ONGOING_LOG);
+    log_store.PersistUnsentLogs();
+    EXPECT_EQ(0U, TypeCount(MetricsLog::INITIAL_STABILITY_LOG));
+    EXPECT_EQ(1U, TypeCount(MetricsLog::ONGOING_LOG));
+  }
+
+  // Relaunch load and store more logs.
+  {
+    MetricsLogStore log_store(&pref_service_, 0);
+    log_store.LoadPersistedUnsentLogs();
+    EXPECT_TRUE(log_store.has_unsent_logs());
+    EXPECT_EQ(0U, TypeCount(MetricsLog::INITIAL_STABILITY_LOG));
+    EXPECT_EQ(1U, TypeCount(MetricsLog::ONGOING_LOG));
+    log_store.StoreLog("x", MetricsLog::INITIAL_STABILITY_LOG);
+    log_store.StageNextLog();
+    log_store.StoreLog("b", MetricsLog::ONGOING_LOG);
+
+    EXPECT_TRUE(log_store.has_unsent_logs());
+    EXPECT_TRUE(log_store.has_staged_log());
+    EXPECT_EQ(0U, TypeCount(MetricsLog::INITIAL_STABILITY_LOG));
+    EXPECT_EQ(1U, TypeCount(MetricsLog::ONGOING_LOG));
+
+    log_store.PersistUnsentLogs();
+    EXPECT_EQ(1U, TypeCount(MetricsLog::INITIAL_STABILITY_LOG));
+    EXPECT_EQ(2U, TypeCount(MetricsLog::ONGOING_LOG));
+  }
+
+  // Relaunch and verify that once logs are handled they are not re-persisted.
+  {
+    MetricsLogStore log_store(&pref_service_, 0);
+    log_store.LoadPersistedUnsentLogs();
+    EXPECT_TRUE(log_store.has_unsent_logs());
+
+    log_store.StageNextLog();
+    log_store.DiscardStagedLog();
+    // The initial log should be sent first; update the persisted storage to
+    // verify.
+    log_store.PersistUnsentLogs();
+    EXPECT_EQ(0U, TypeCount(MetricsLog::INITIAL_STABILITY_LOG));
+    EXPECT_EQ(2U, TypeCount(MetricsLog::ONGOING_LOG));
+
+    // Handle the first ongoing log.
+    log_store.StageNextLog();
+    log_store.DiscardStagedLog();
+    EXPECT_TRUE(log_store.has_unsent_logs());
+
+    // Handle the last log.
+    log_store.StageNextLog();
+    log_store.DiscardStagedLog();
+    EXPECT_FALSE(log_store.has_unsent_logs());
+
+    // Nothing should have changed "on disk" since PersistUnsentLogs hasn't been
+    // called again.
+    EXPECT_EQ(2U, TypeCount(MetricsLog::ONGOING_LOG));
+    // Persist, and make sure nothing is left.
+    log_store.PersistUnsentLogs();
+    EXPECT_EQ(0U, TypeCount(MetricsLog::INITIAL_STABILITY_LOG));
+    EXPECT_EQ(0U, TypeCount(MetricsLog::ONGOING_LOG));
+  }
+}
+
+TEST_F(MetricsLogStoreTest, StoreStagedOngoingLog) {
+  // Ensure that types are preserved when storing staged logs.
+  MetricsLogStore log_store(&pref_service_, 0);
+  log_store.LoadPersistedUnsentLogs();
+  log_store.StoreLog("a", MetricsLog::ONGOING_LOG);
+  log_store.StageNextLog();
+  log_store.PersistUnsentLogs();
+
+  EXPECT_EQ(0U, TypeCount(MetricsLog::INITIAL_STABILITY_LOG));
+  EXPECT_EQ(1U, TypeCount(MetricsLog::ONGOING_LOG));
+}
+
+TEST_F(MetricsLogStoreTest, StoreStagedInitialLog) {
+  // Ensure that types are preserved when storing staged logs.
+  MetricsLogStore log_store(&pref_service_, 0);
+  log_store.LoadPersistedUnsentLogs();
+  log_store.StoreLog("b", MetricsLog::INITIAL_STABILITY_LOG);
+  log_store.StageNextLog();
+  log_store.PersistUnsentLogs();
+
+  EXPECT_EQ(1U, TypeCount(MetricsLog::INITIAL_STABILITY_LOG));
+  EXPECT_EQ(0U, TypeCount(MetricsLog::ONGOING_LOG));
+}
+
+TEST_F(MetricsLogStoreTest, LargeLogDiscarding) {
+  // Set the size threshold very low, to verify that it's honored.
+  MetricsLogStore log_store(&pref_service_, 1);
+  log_store.LoadPersistedUnsentLogs();
+
+  log_store.StoreLog("persisted", MetricsLog::INITIAL_STABILITY_LOG);
+  log_store.StoreLog("not_persisted", MetricsLog::ONGOING_LOG);
+
+  // Only the stability log should be written out, due to the threshold.
+  log_store.PersistUnsentLogs();
+  EXPECT_EQ(1U, TypeCount(MetricsLog::INITIAL_STABILITY_LOG));
+  EXPECT_EQ(0U, TypeCount(MetricsLog::ONGOING_LOG));
+}
+
+TEST_F(MetricsLogStoreTest, DiscardOrder) {
+  // Ensure that the correct log is discarded if new logs are pushed while
+  // a log is staged.
+  MetricsLogStore log_store(&pref_service_, 0);
+  log_store.LoadPersistedUnsentLogs();
+
+  log_store.StoreLog("a", MetricsLog::ONGOING_LOG);
+  log_store.StoreLog("b", MetricsLog::ONGOING_LOG);
+  log_store.StageNextLog();
+  log_store.StoreLog("c", MetricsLog::INITIAL_STABILITY_LOG);
+  EXPECT_EQ(2U, log_store.ongoing_log_count());
+  EXPECT_EQ(1U, log_store.initial_log_count());
+  // Should discard the ongoing log staged earlier.
+  log_store.DiscardStagedLog();
+  EXPECT_EQ(1U, log_store.ongoing_log_count());
+  EXPECT_EQ(1U, log_store.initial_log_count());
+  // Initial log should be staged next.
+  log_store.StageNextLog();
+  log_store.DiscardStagedLog();
+  EXPECT_EQ(1U, log_store.ongoing_log_count());
+  EXPECT_EQ(0U, log_store.initial_log_count());
+}
+
+}  // namespace metrics