Slow Reports: Set a minimum time in between reports, and check for OTR sessions

chrome/browser/tracing/chrome_tracing_delegate.cc

 // Copyright 2015 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 "chrome/browser/tracing/chrome_tracing_delegate.h"
+
+#include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/pref_service.h"
+#include "base/time/time.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/tracing/crash_service_uploader.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_otr_state.h"
+#include "chrome/common/pref_names.h"
+#include "content/public/browser/background_tracing_config.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace {
+
+const int kMinDaysUntilNextUpload = 7;
+
+}  // namespace
+
+void ChromeTracingDelegate::RegisterPrefs(PrefRegistrySimple* registry) {
+  registry->RegisterInt64Pref(prefs::kBackgroundTracingLastUpload, 0);
+}
+
+ChromeTracingDelegate::ChromeTracingDelegate() : incognito_launched_(false) {
+  CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  BrowserList::AddObserver(this);
+}
+
+ChromeTracingDelegate::~ChromeTracingDelegate() {
+  CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  BrowserList::RemoveObserver(this);
+}
+
+void ChromeTracingDelegate::OnBrowserAdded(Browser* browser) {
+  if (browser->profile()->IsOffTheRecord())
+    incognito_launched_ = true;
+}
 
 scoped_ptr<content::TraceUploader> ChromeTracingDelegate::GetTraceUploader(
     net::URLRequestContextGetter* request_context) {
   return scoped_ptr<content::TraceUploader>(
       new TraceCrashServiceUploader(request_context));
 }
+
+bool ChromeTracingDelegate::IsAllowedToBeginBackgroundScenario(
+    const content::BackgroundTracingConfig& config,
+    bool requires_anonymized_data) {
+  Profile* profile = g_browser_process->profile_manager()
+                         ->GetLastUsedProfile()
+                         ->GetOriginalProfile();
+  DCHECK(profile);
+  // Safeguard, in case background tracing is responsible for a crash on
+  // startup.
+  if (profile->GetLastSessionExitType() == Profile::EXIT_CRASHED)
+    return false;
+
+  if (requires_anonymized_data && chrome::IsOffTheRecordSessionActive())
+    return false;
+
+  if (config.mode ==
+      content::BackgroundTracingConfig::PREEMPTIVE_TRACING_MODE) {
+    PrefService* local_state = g_browser_process->local_state();
+    DCHECK(local_state);
+    const base::Time last_upload_time = base::Time::FromInternalValue(
+        local_state->GetInt64(prefs::kBackgroundTracingLastUpload));
+    if (!last_upload_time.is_null()) {
+      base::Time computed_next_allowed_time =
+          last_upload_time + base::TimeDelta::FromDays(kMinDaysUntilNextUpload);
+      if (computed_next_allowed_time > base::Time::Now()) {
+        return false;
+      }
+    }
+  }
+
+  return true;
+}
+
+bool ChromeTracingDelegate::IsAllowedToEndBackgroundScenario(
+    const content::BackgroundTracingConfig& config,
+    bool requires_anonymized_data) {
+  if (requires_anonymized_data && incognito_launched_)
+    return false;
+
+  if (config.mode ==
+      content::BackgroundTracingConfig::PREEMPTIVE_TRACING_MODE) {
+    PrefService* local_state = g_browser_process->local_state();
+    DCHECK(local_state);
+    local_state->SetInt64(prefs::kBackgroundTracingLastUpload,
+                          base::Time::Now().ToInternalValue());
+
+    // We make sure we've persisted the value in case finalizing the tracing
+    // causes a crash.
+    local_state->CommitPendingWrite();
+  }
+
+  return true;
+}