Differential updates for components.

chrome/browser/component_updater/component_updater_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/version.h"
 #include "googleurl/src/gurl.h"
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace base {
 class DictionaryValue;
 class FilePath;
 }
 
+class ComponentPatcher;
+
 // Component specific installers must derive from this class and implement
 // OnUpdateError() and Install(). A valid instance of this class must be
 // given to ComponentUpdateService::RegisterComponent().
 class ComponentInstaller {
  public :
   // Called by the component updater on the UI thread when there was a
   // problem unpacking or verifying the component. |error| is a non-zero
   // value which is only meaningful to the component updater.
   virtual void OnUpdateError(int error) = 0;
 
   // Called by the component updater when a component has been unpacked
   // and is ready to be installed. |manifest| contains the CRX manifest
   // json dictionary and |unpack_path| contains the temporary directory
   // with all the unpacked CRX files.
   virtual bool Install(const base::DictionaryValue& manifest,
                        const base::FilePath& unpack_path) = 0;
 
+  // Set |installed_file| to the full path to the installed |file|. |file| is
+  // the filename of the file in this component's CRX. Returns false if this is
+  // not possible (the file has been removed or modified, or its current
+  // location is unknown). Otherwise, returns true.
+  virtual bool GetInstalledFile(const std::string& file,
+                                base::FilePath* installed_file) = 0;
+
  protected:
   virtual ~ComponentInstaller() {}
 };
 
 // Describes a particular component that can be installed or updated. This
 // structure is required to register a component with the component updater.
-// Only |name| is optional. |pk_hash| is the SHA256 hash of the component's
-// public key. If the component is to be installed then version should be
-// "0" or "0.0", else it should be the current version.
+// |pk_hash| is the SHA256 hash of the component's public key. If the component
+// is to be installed then version should be "0" or "0.0", else it should be
+// the current version. |fingerprint| and |name| are optional.
 // |source| is by default pointing to BANDAID but if needed it can be made
 // to point to the webstore (CWS_PUBLIC) or to the webstore sandbox. It is
 // important to note that the BANDAID source if active throught the day
 // can pre-empt updates from the other sources down the list.
 struct CrxComponent {
   // Specifies the source url for manifest check.
   enum UrlSource {
     BANDAID,
     CWS_PUBLIC,
-    CWS_SANDBOX
+    CWS_SANDBOX,
   };
 
   std::vector<uint8> pk_hash;
   ComponentInstaller* installer;
   Version version;
+  std::string fingerprint;
   std::string name;
   UrlSource source;
   CrxComponent();
   ~CrxComponent();
 };
 
 // The component update service is in charge of installing or upgrading
 // select parts of chrome. Each part is called a component and managed by
 // instances of CrxComponent registered using RegisterComponent(). On the
 // server, each component is packaged as a CRX which is the same format used
@@ skipping 47 matching lines @@
     // How big each update request can be. Don't go above 2000.
     virtual size_t UrlSizeLimit() = 0;
     // The source of contexts for all the url requests.
     virtual net::URLRequestContextGetter* RequestContext() = 0;
     // True means that all ops are performed in this process.
     virtual bool InProcess() = 0;
     // The component updater will call this function when an interesting event
     // happens. It should be used mostly as a place to add application specific
     // logging or telemetry. |extra| is |event| dependent.
     virtual void OnEvent(Events event, int extra) = 0;
+    // Creates a new ComponentPatcher in a platform-specific way. This is useful
+    // for dependency injection.
+    virtual ComponentPatcher* CreateComponentPatcher() = 0;
+    // True means that this client can handle delta updates.
+    virtual bool DeltasEnabled() const = 0;
   };
 
   // Start doing update checks and installing new versions of registered
   // components after Configurator::InitialDelay() seconds.
   virtual Status Start() = 0;
 
   // Stop doing update checks. In-flight requests and pending installations
   // will not be canceled.
   virtual Status Stop() = 0;
 
@@ skipping 14 matching lines @@
 
   virtual ~ComponentUpdateService() {}
 };
 
 // Creates the component updater. You must pass a valid |config| allocated on
 // the heap which the component updater will own.
 ComponentUpdateService* ComponentUpdateServiceFactory(
     ComponentUpdateService::Configurator* config);
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_