Updating trunk VERSION from 2139.0 to 2140.0
[chromium-blink-merge.git] / components / component_updater / component_patcher.h
bloba7600f1580d47b58ebef60a683f0cfb5b237f4b4
1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 // Component updates can be either differential updates or full updates.
6 // Full updates come in CRX format; differential updates come in CRX-style
7 // archives, but have a different magic number. They contain "commands.json", a
8 // list of commands for the patcher to follow. The patcher uses these commands,
9 // the other files in the archive, and the files from the existing installation
10 // of the component to create the contents of a full update, which is then
11 // installed normally.
12 // Component updates are specified by the 'codebasediff' attribute of an
13 // updatecheck response:
14 // <updatecheck codebase="http://example.com/extension_1.2.3.4.crx"
15 // hash="12345" size="9854" status="ok" version="1.2.3.4"
16 // prodversionmin="2.0.143.0"
17 // codebasediff="http://example.com/diff_1.2.3.4.crx"
18 // hashdiff="123" sizediff="101"
19 // fp="1.123" />
20 // The component updater will attempt a differential update if it is available
21 // and allowed to, and fall back to a full update if it fails.
23 // After installation (diff or full), the component updater records "fp", the
24 // fingerprint of the installed files, to later identify the existing files to
25 // the server so that a proper differential update can be provided next cycle.
27 #ifndef COMPONENTS_COMPONENT_UPDATER_COMPONENT_PATCHER_H_
28 #define COMPONENTS_COMPONENT_UPDATER_COMPONENT_PATCHER_H_
30 #include "base/callback_forward.h"
31 #include "base/memory/ref_counted.h"
32 #include "base/memory/scoped_ptr.h"
33 #include "base/values.h"
34 #include "components/component_updater/component_unpacker.h"
36 namespace base {
37 class FilePath;
40 namespace component_updater {
42 class ComponentInstaller;
43 class DeltaUpdateOp;
44 class OutOfProcessPatcher;
46 // The type of a patch file.
47 enum PatchType {
48 kPatchTypeUnknown,
49 kPatchTypeCourgette,
50 kPatchTypeBsdiff,
53 // Encapsulates a task for applying a differential update to a component.
54 class ComponentPatcher : public base::RefCountedThreadSafe<ComponentPatcher> {
55 public:
56 // Takes an unpacked differential CRX (|input_dir|) and a component installer,
57 // and sets up the class to create a new (non-differential) unpacked CRX.
58 // If |in_process| is true, patching will be done completely within the
59 // existing process. Otherwise, some steps of patching may be done
60 // out-of-process.
61 ComponentPatcher(const base::FilePath& input_dir,
62 const base::FilePath& unpack_dir,
63 ComponentInstaller* installer,
64 scoped_refptr<OutOfProcessPatcher> out_of_process_patcher,
65 scoped_refptr<base::SequencedTaskRunner> task_runner);
67 // Starts patching files. This member function returns immediately, after
68 // posting a task to do the patching. When patching has been completed,
69 // |callback| will be called with the error codes if any error codes were
70 // encountered.
71 void Start(const ComponentUnpacker::Callback& callback);
73 private:
74 friend class base::RefCountedThreadSafe<ComponentPatcher>;
76 virtual ~ComponentPatcher();
78 void StartPatching();
80 void PatchNextFile();
82 void DonePatchingFile(ComponentUnpacker::Error error, int extended_error);
84 void DonePatching(ComponentUnpacker::Error error, int extended_error);
86 const base::FilePath input_dir_;
87 const base::FilePath unpack_dir_;
88 ComponentInstaller* const installer_;
89 scoped_refptr<OutOfProcessPatcher> out_of_process_patcher_;
90 ComponentUnpacker::Callback callback_;
91 scoped_ptr<base::ListValue> commands_;
92 base::ValueVector::const_iterator next_command_;
93 scoped_refptr<DeltaUpdateOp> current_operation_;
94 scoped_refptr<base::SequencedTaskRunner> task_runner_;
96 DISALLOW_COPY_AND_ASSIGN(ComponentPatcher);
99 } // namespace component_updater
101 #endif // COMPONENTS_COMPONENT_UPDATER_COMPONENT_PATCHER_H_