Differential updates for components.

chrome/browser/component_updater/component_updater_configurator.cc

 // Copyright (c) 2012 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/component_updater/component_updater_configurator.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
 #include "base/win/windows_version.h"
 #include "build/build_config.h"
+#include "chrome/browser/component_updater/component_patcher.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/omaha_query_params/omaha_query_params.h"
 #include "net/url_request/url_request_context_getter.h"
 
+#if defined(OS_WIN)
+#include "chrome/browser/component_updater/component_patcher_win.h"
+#endif
+
 namespace {
+
 // Default time constants.
 const int kDelayOneMinute = 60;
 const int kDelayOneHour = kDelayOneMinute * 60;
 
 // Debug values you can pass to --component-updater-debug=value1,value2.
 // Speed up component checking.
-const char kDebugFastUpdate[] = "fast-update";
+const char kSwitchFastUpdate[] = "fast-update";
 // Force out-of-process-xml parsing.
-const char kDebugOutOfProcess[] = "out-of-process";
+const char kSwitchOutOfProcess[] = "out-of-process";
 // Add "testrequest=1" parameter to the update check query.
-const char kDebugRequestParam[] = "test-request";
+const char kSwitchRequestParam[] = "test-request";
+// Disables differential updates.
+const char kSwitchDisableDeltaUpdates[] = "disable-delta-updates";
 
 // The urls from which an update manifest can be fetched.
 const char* kUrlSources[] = {
   "http://clients2.google.com/service/update2/crx",       // BANDAID
   "http://omaha.google.com/service/update2/crx",          // CWS_PUBLIC
-  "http://omaha.sandbox.google.com/service/update2/crx"   // CWS_SANDBOX
+  "http://omaha.sandbox.google.com/service/update2/crx",   // CWS_SANDBOX
 };
 
-bool HasDebugValue(const std::vector<std::string>& vec, const char* test) {
+bool HasSwitchValue(const std::vector<std::string>& vec, const char* test) {
   if (vec.empty())
     return 0;
   return (std::find(vec.begin(), vec.end(), test) != vec.end());
 }
 
 }  // namespace
 
 class ChromeConfigurator : public ComponentUpdateService::Configurator {
  public:
   ChromeConfigurator(const CommandLine* cmdline,
                      net::URLRequestContextGetter* url_request_getter);
 
   virtual ~ChromeConfigurator() {}
 
   virtual int InitialDelay() OVERRIDE;
   virtual int NextCheckDelay() OVERRIDE;
   virtual int StepDelay() OVERRIDE;
   virtual int MinimumReCheckWait() OVERRIDE;
   virtual int OnDemandDelay() OVERRIDE;
   virtual GURL UpdateUrl(CrxComponent::UrlSource source) OVERRIDE;
   virtual const char* ExtraRequestParams() OVERRIDE;
   virtual size_t UrlSizeLimit() OVERRIDE;
   virtual net::URLRequestContextGetter* RequestContext() OVERRIDE;
   virtual bool InProcess() OVERRIDE;
   virtual void OnEvent(Events event, int val) OVERRIDE;
+  virtual ComponentPatcher* CreateComponentPatcher() OVERRIDE;
+  virtual bool DeltasEnabled() const OVERRIDE;
 
  private:
   net::URLRequestContextGetter* url_request_getter_;
   std::string extra_info_;
   bool fast_update_;
   bool out_of_process_;
+  bool deltas_enabled_;
 };
 
 ChromeConfigurator::ChromeConfigurator(const CommandLine* cmdline,
     net::URLRequestContextGetter* url_request_getter)
       : url_request_getter_(url_request_getter),
         extra_info_(chrome::OmahaQueryParams::Get(
-            chrome::OmahaQueryParams::CHROME)) {
+            chrome::OmahaQueryParams::CHROME)),
+        fast_update_(false),
+        out_of_process_(false),
+        deltas_enabled_(false) {
   // Parse comma-delimited debug flags.
-  std::vector<std::string> debug_values;
-  Tokenize(cmdline->GetSwitchValueASCII(switches::kComponentUpdaterDebug),
-      ",", &debug_values);
-  fast_update_ = HasDebugValue(debug_values, kDebugFastUpdate);
-  out_of_process_ = HasDebugValue(debug_values, kDebugOutOfProcess);
+  std::vector<std::string> switch_values;
+  Tokenize(cmdline->GetSwitchValueASCII(switches::kComponentUpdater),
+      ",", &switch_values);
+  fast_update_ = HasSwitchValue(switch_values, kSwitchFastUpdate);
+  out_of_process_ = HasSwitchValue(switch_values, kSwitchOutOfProcess);
+#if defined(OS_WIN)
+  deltas_enabled_ = !HasSwitchValue(switch_values, kSwitchDisableDeltaUpdates);
+#else
+  deltas_enabled_ = false;
+#endif
 
   // Make the extra request params, they are necessary so omaha does
   // not deliver components that are going to be rejected at install time.
 #if defined(OS_WIN)
   if (base::win::OSInfo::GetInstance()->wow64_status() ==
       base::win::OSInfo::WOW64_ENABLED)
     extra_info_ += "&wow64=1";
 #endif
-  if (HasDebugValue(debug_values, kDebugRequestParam))
+  if (HasSwitchValue(switch_values, kSwitchRequestParam))
     extra_info_ += "&testrequest=1";
 }
 
 int ChromeConfigurator::InitialDelay() {
   return fast_update_ ? 1 : (6 * kDelayOneMinute);
 }
 
 int ChromeConfigurator::NextCheckDelay() {
   return fast_update_ ? 3 : (2 * kDelayOneHour);
 }
@@ skipping 49 matching lines @@
       break;
     case kInstallerError:
       UMA_HISTOGRAM_ENUMERATION("ComponentUpdater.InstallError", val, 100);
       break;
     default:
       NOTREACHED();
       break;
   }
 }
 
+ComponentPatcher* ChromeConfigurator::CreateComponentPatcher() {
+#if defined(OS_WIN)
+  return new ComponentPatcherWin();
+#else
+  return new ComponentPatcherCrossPlatform();
+#endif
+}
+
+bool ChromeConfigurator::DeltasEnabled() const {
+  return deltas_enabled_;
+}
+
 ComponentUpdateService::Configurator* MakeChromeComponentUpdaterConfigurator(
     const CommandLine* cmdline, net::URLRequestContextGetter* context_getter) {
   return new ChromeConfigurator(cmdline, context_getter);
 }