[iOS] Upstream some stability code

ios/chrome/browser/crash_report/breakpad_helper.mm

Index: ios/chrome/browser/crash_report/breakpad_helper.mm
diff --git a/ios/chrome/browser/crash_report/breakpad_helper.mm b/ios/chrome/browser/crash_report/breakpad_helper.mm
new file mode 100644
index 0000000000000000000000000000000000000000..526ab12b18a2d5b340f1f20a90ba270771dfcd7b
--- /dev/null
+++ b/ios/chrome/browser/crash_report/breakpad_helper.mm
@@ -0,0 +1,361 @@
+// 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 "ios/chrome/browser/crash_report/breakpad_helper.h"
+
+#import <Foundation/Foundation.h>
+
+#include "base/auto_reset.h"
+#include "base/bind.h"
+#include "base/debug/crash_logging.h"
+#include "base/files/file_enumerator.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "base/strings/sys_string_conversions.h"
+#include "ios/chrome/browser/chrome_paths.h"
+#import "ios/chrome/browser/crash_report/crash_report_user_application_state.h"
+#include "ios/web/public/web_thread.h"
+
+// TODO(stuartmorgan): Move this up where it belongs once
+// http://code.google.com/p/google-breakpad/issues/detail?id=487
+// is fixed. For now, put it at the end to avoid compiler errors.
+#import "breakpad/src/client/ios/BreakpadController.h"
+
+namespace breakpad_helper {
+
+namespace {
+
+// Key in NSUserDefaults for a Boolean value that stores whether to upload
+// crash reports.
+NSString* const kCrashReportsUploadingEnabledKey =
+    @"CrashReportsUploadingEnabled";
+
+NSString* const kCrashedInBackground = @"crashed_in_background";
+NSString* const kFreeDiskInKB = @"free_disk_in_kb";
+NSString* const kFreeMemoryInKB = @"free_memory_in_kb";
+NSString* const kMemoryWarningInProgress = @"memory_warning_in_progress";
+NSString* const kMemoryWarningCount = @"memory_warning_count";
+NSString* const kUptimeAtRestoreInMs = @"uptime_at_restore_in_ms";
+NSString* const kUploadedInRecoveryMode = @"uploaded_in_recovery_mode";
+
+// Multiple state information are combined into one CrachReportMultiParameter
+// to save limited and finite number of ReportParameters.
+// These are the values grouped in the user_application_state parameter.
+NSString* const kDataProxyIsEnabled = @"dataproxy";
+NSString* const kOrientationState = @"orient";
+NSString* const kSignedIn = @"signIn";
+NSString* const kIsShowingPDF = @"pdf";
+NSString* const kVideoPlaying = @"avplay";
+
+// Whether the crash reporter is enabled.
+bool g_crash_reporter_enabled = false;
+
+void DeleteAllReportsInDirectory(base::FilePath directory) {
+  base::FileEnumerator enumerator(directory, false,
+                                  base::FileEnumerator::FILES);
+  base::FilePath cur_file;
+  while (!(cur_file = enumerator.Next()).value().empty()) {
+    if (cur_file.BaseName().value() != kReporterLogFilename)
+      base::DeleteFile(cur_file, false);
+  }
+}
+
+// Callback for base::debug::SetCrashKeyReportingFunctions
+void SetCrashKeyValueImpl(const base::StringPiece& key,
+                          const base::StringPiece& value) {
+  AddReportParameter(base::SysUTF8ToNSString(key.as_string()),
+                     base::SysUTF8ToNSString(value.as_string()), true);
+}
+
+// Callback for base::debug::SetCrashKeyReportingFunctions
+void ClearCrashKeyValueImpl(const base::StringPiece& key) {
+  RemoveReportParameter(base::SysUTF8ToNSString(key.as_string()));
+}
+
+// Callback for logging::SetLogMessageHandler
+bool FatalMessageHandler(int severity,
+                         const char* file,
+                         int line,
+                         size_t message_start,
+                         const std::string& str) {
+  // Do not handle non-FATAL.
+  if (severity != logging::LOG_FATAL)
+    return false;
+
+  // In case of OOM condition, this code could be reentered when
+  // constructing and storing the key.  Using a static is not
+  // thread-safe, but if multiple threads are in the process of a
+  // fatal crash at the same time, this should work.
+  static bool guarded = false;
+  if (guarded)
+    return false;
+
+  base::AutoReset<bool> guard(&guarded, true);
+
+  // Only log last path component.  This matches logging.cc.
+  if (file) {
+    const char* slash = strrchr(file, '/');
+    if (slash)
+      file = slash + 1;
+  }
+
+  NSString* fatal_key = @"LOG_FATAL";
+  NSString* fatal_value = [NSString
+      stringWithFormat:@"%s:%d: %s", file, line, str.c_str() + message_start];
+  AddReportParameter(fatal_key, fatal_value, true);
+
+  // Rather than including the code to force the crash here, allow the
+  // caller to do it.
+  return false;
+}
+
+// Caches the uploading flag in NSUserDefaults, so that we can access the value
+// in safe mode.
+void CacheUploadingEnabled(bool uploading_enabled) {
+  NSUserDefaults* user_defaults = [NSUserDefaults standardUserDefaults];
+  [user_defaults setBool:uploading_enabled ? YES : NO
+                  forKey:kCrashReportsUploadingEnabledKey];
+}
+
+}  // namespace
+
+void Start(const std::string& channel_name) {
+  DCHECK(!g_crash_reporter_enabled);
+  [[BreakpadController sharedInstance] start:YES];
+  base::debug::SetCrashKeyReportingFunctions(&SetCrashKeyValueImpl,
+                                             &ClearCrashKeyValueImpl);
+  logging::SetLogMessageHandler(&FatalMessageHandler);
+  g_crash_reporter_enabled = true;
+  // Register channel information.
+  if (channel_name.length()) {
+    AddReportParameter(@"channel", base::SysUTF8ToNSString(channel_name), true);
+  }
+  // Notifying the PathService on the location of the crashes so that crashes
+  // can be displayed to the user on the about:crashes page.
+  NSArray* cachesDirectories = NSSearchPathForDirectoriesInDomains(
+      NSCachesDirectory, NSUserDomainMask, YES);
+  NSString* cachePath = [cachesDirectories objectAtIndex:0];
+  NSString* dumpDirectory =
+      [cachePath stringByAppendingPathComponent:@kDefaultLibrarySubdirectory];
+  PathService::Override(ios::DIR_CRASH_DUMPS,
+                        base::FilePath(base::SysNSStringToUTF8(dumpDirectory)));
+}
+
+void SetEnabled(bool enabled) {
+  if (g_crash_reporter_enabled == enabled)
+    return;
+  g_crash_reporter_enabled = enabled;
+  if (g_crash_reporter_enabled) {
+    [[BreakpadController sharedInstance] start:NO];
+  } else {
+    [[BreakpadController sharedInstance] stop];
+    CacheUploadingEnabled(false);
+  }
+}
+
+void SetUploadingEnabled(bool enabled) {
+  CacheUploadingEnabled(g_crash_reporter_enabled && enabled);
+
+  if (!g_crash_reporter_enabled)
+    return;
+  [[BreakpadController sharedInstance] setUploadingEnabled:enabled];
+}
+
+bool IsUploadingEnabled() {
+  // Return the value cached by CacheUploadingEnabled().
+  return [[NSUserDefaults standardUserDefaults]
+      boolForKey:kCrashReportsUploadingEnabledKey];
+}
+
+void CleanupCrashReports() {
+  base::FilePath crash_directory;
+  PathService::Get(ios::DIR_CRASH_DUMPS, &crash_directory);
+  web::WebThread::PostBlockingPoolTask(
+      FROM_HERE, base::Bind(&DeleteAllReportsInDirectory, crash_directory));
+}
+
+void AddReportParameter(NSString* key, NSString* value, bool async) {
+  if (!g_crash_reporter_enabled)
+    return;
+  if (async) {
+    [[BreakpadController sharedInstance] addUploadParameter:value forKey:key];
+    return;
+  }
+  dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
+  [[BreakpadController sharedInstance] withBreakpadRef:^(BreakpadRef ref) {
+    if (ref)
+      BreakpadAddUploadParameter(ref, key, value);
+    dispatch_semaphore_signal(semaphore);
+  }];
+  dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
+  dispatch_release(semaphore);
+}
+
+int GetCrashReportCount() {
+  dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
+  __block int outerCrashReportCount = 0;
+  [[BreakpadController sharedInstance] getCrashReportCount:^(int count) {
+    outerCrashReportCount = count;
+    dispatch_semaphore_signal(semaphore);
+  }];
+  dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
+  dispatch_release(semaphore);
+  return outerCrashReportCount;
+}
+
+void GetCrashReportCount(void (^callback)(int)) {
+  [[BreakpadController sharedInstance] getCrashReportCount:callback];
+}
+
+bool HasReportToUpload() {
+  return GetCrashReportCount() > 0;
+}
+
+void RemoveReportParameter(NSString* key) {
+  if (!g_crash_reporter_enabled)
+    return;
+  [[BreakpadController sharedInstance] removeUploadParameterForKey:key];
+}
+
+void SetCurrentlyInBackground(bool background) {
+  if (background)
+    AddReportParameter(kCrashedInBackground, @"yes", true);
+  else
+    RemoveReportParameter(kCrashedInBackground);
+}
+
+void SetMemoryWarningCount(int count) {
+  if (count) {
+    AddReportParameter(kMemoryWarningCount,
+                       [NSString stringWithFormat:@"%d", count], true);
+  } else {
+    RemoveReportParameter(kMemoryWarningCount);
+  }
+}
+
+void SetMemoryWarningInProgress(bool value) {
+  if (value)
+    AddReportParameter(kMemoryWarningInProgress, @"yes", true);
+  else
+    RemoveReportParameter(kMemoryWarningInProgress);
+}
+
+void SetCurrentFreeMemoryInKB(int value) {
+  AddReportParameter(kFreeMemoryInKB, [NSString stringWithFormat:@"%d", value],
+                     true);
+}
+
+void SetCurrentFreeDiskInKB(int value) {
+  AddReportParameter(kFreeDiskInKB, [NSString stringWithFormat:@"%d", value],
+                     true);
+}
+
+void SetCurrentTabIsPDF(bool value) {
+  if (value) {
+    [[CrashReportUserApplicationState sharedInstance]
+        incrementValue:kIsShowingPDF];
+  } else {
+    [[CrashReportUserApplicationState sharedInstance]
+        decrementValue:kIsShowingPDF];
+  }
+}
+
+void SetCurrentOrientation(int statusBarOrientation, int deviceOrientation) {
+  DCHECK((statusBarOrientation < 10) && (deviceOrientation < 10));
+  int deviceAndUIOrientation = 10 * statusBarOrientation + deviceOrientation;
+  [[CrashReportUserApplicationState sharedInstance]
+       setValue:kOrientationState
+      withValue:deviceAndUIOrientation];
+}
+
+void SetCurrentlySignedIn(bool signedIn) {
+  if (signedIn) {
+    [[CrashReportUserApplicationState sharedInstance] setValue:kSignedIn
+                                                     withValue:1];
+  } else {
+    [[CrashReportUserApplicationState sharedInstance] removeValue:kSignedIn];
+  }
+}
+
+void SetDataReductionProxyIsEnabled(bool value) {
+  if (value) {
+    [[CrashReportUserApplicationState sharedInstance]
+         setValue:kDataProxyIsEnabled
+        withValue:value];
+  } else {
+    [[CrashReportUserApplicationState sharedInstance]
+        removeValue:kDataProxyIsEnabled];
+  }
+}
+
+void MediaStreamPlaybackDidStart() {
+  [[CrashReportUserApplicationState sharedInstance]
+      incrementValue:kVideoPlaying];
+}
+
+void MediaStreamPlaybackDidStop() {
+  [[CrashReportUserApplicationState sharedInstance]
+      decrementValue:kVideoPlaying];
+}
+
+// Records the current process uptime in the "uptime_at_restore_in_ms". This
+// will allow engineers to dremel crash logs to find crash whose delta between
+// process uptime at crash and process uptime at restore is smaller than X
+// seconds and find insta-crashers.
+void WillStartCrashRestoration() {
+  if (!g_crash_reporter_enabled)
+    return;
+  // We use gettimeofday and BREAKPAD_PROCESS_START_TIME to compute the
+  // uptime to stay as close as possible as how breakpad computes the
+  // "ProcessUptime" in order to have meaningful comparison in dremel.
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  // The values stored in the breakpad log are only accessible through a
+  // BreakpadRef. To record the process uptime at restore, the value of
+  // BREAKPAD_PROCESS_START_TIME is required to compute the delta.
+  [[BreakpadController sharedInstance] withBreakpadRef:^(BreakpadRef ref) {
+    if (!ref)
+      return;
+    NSString* processStartTimeSecondsString =
+        BreakpadKeyValue(ref, @BREAKPAD_PROCESS_START_TIME);
+    if (!processStartTimeSecondsString)
+      return;
+
+    time_t processStartTimeSeconds =
+        [processStartTimeSecondsString longLongValue];
+    time_t processUptimeSeconds = tv.tv_sec - processStartTimeSeconds;
+    unsigned long long processUptimeMilliseconds =
+        static_cast<unsigned long long>(processUptimeSeconds) *
+        base::Time::kMillisecondsPerSecond;
+    BreakpadAddUploadParameter(
+        ref, kUptimeAtRestoreInMs,
+        [NSString stringWithFormat:@"%llu", processUptimeMilliseconds]);
+  }];
+}
+
+void StartUploadingReportsInRecoveryMode() {
+  if (!g_crash_reporter_enabled)
+    return;
+  [[BreakpadController sharedInstance] stop];
+  [[BreakpadController sharedInstance] setParametersToAddAtUploadTime:@{
+    kUploadedInRecoveryMode : @"yes"
+  }];
+  [[BreakpadController sharedInstance] setUploadInterval:1];
+  [[BreakpadController sharedInstance] start:NO];
+  [[BreakpadController sharedInstance] setUploadingEnabled:YES];
+}
+
+void RestoreDefaultConfiguration() {
+  if (!g_crash_reporter_enabled)
+    return;
+  [[BreakpadController sharedInstance] stop];
+  [[BreakpadController sharedInstance] resetConfiguration];
+  [[BreakpadController sharedInstance] start:NO];
+  [[BreakpadController sharedInstance] setUploadingEnabled:NO];
+}
+
+}  // namespace breakpad_helper