OLD | NEW |
| (Empty) |
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. | |
4 | |
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. | |
22 // | |
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. | |
26 | |
27 #ifndef COMPONENTS_COMPONENT_UPDATER_COMPONENT_PATCHER_H_ | |
28 #define COMPONENTS_COMPONENT_UPDATER_COMPONENT_PATCHER_H_ | |
29 | |
30 #include "base/callback_forward.h" | |
31 #include "base/macros.h" | |
32 #include "base/memory/ref_counted.h" | |
33 #include "base/memory/scoped_ptr.h" | |
34 #include "base/values.h" | |
35 #include "components/component_updater/component_unpacker.h" | |
36 | |
37 namespace base { | |
38 class FilePath; | |
39 } | |
40 | |
41 namespace component_updater { | |
42 | |
43 class ComponentInstaller; | |
44 class DeltaUpdateOp; | |
45 class OutOfProcessPatcher; | |
46 | |
47 // The type of a patch file. | |
48 enum PatchType { | |
49 kPatchTypeUnknown, | |
50 kPatchTypeCourgette, | |
51 kPatchTypeBsdiff, | |
52 }; | |
53 | |
54 // Encapsulates a task for applying a differential update to a component. | |
55 class ComponentPatcher : public base::RefCountedThreadSafe<ComponentPatcher> { | |
56 public: | |
57 // Takes an unpacked differential CRX (|input_dir|) and a component installer, | |
58 // and sets up the class to create a new (non-differential) unpacked CRX. | |
59 // If |in_process| is true, patching will be done completely within the | |
60 // existing process. Otherwise, some steps of patching may be done | |
61 // out-of-process. | |
62 ComponentPatcher(const base::FilePath& input_dir, | |
63 const base::FilePath& unpack_dir, | |
64 ComponentInstaller* installer, | |
65 scoped_refptr<OutOfProcessPatcher> out_of_process_patcher, | |
66 scoped_refptr<base::SequencedTaskRunner> task_runner); | |
67 | |
68 // Starts patching files. This member function returns immediately, after | |
69 // posting a task to do the patching. When patching has been completed, | |
70 // |callback| will be called with the error codes if any error codes were | |
71 // encountered. | |
72 void Start(const ComponentUnpacker::Callback& callback); | |
73 | |
74 private: | |
75 friend class base::RefCountedThreadSafe<ComponentPatcher>; | |
76 | |
77 virtual ~ComponentPatcher(); | |
78 | |
79 void StartPatching(); | |
80 | |
81 void PatchNextFile(); | |
82 | |
83 void DonePatchingFile(ComponentUnpacker::Error error, int extended_error); | |
84 | |
85 void DonePatching(ComponentUnpacker::Error error, int extended_error); | |
86 | |
87 const base::FilePath input_dir_; | |
88 const base::FilePath unpack_dir_; | |
89 ComponentInstaller* const installer_; | |
90 scoped_refptr<OutOfProcessPatcher> out_of_process_patcher_; | |
91 ComponentUnpacker::Callback callback_; | |
92 scoped_ptr<base::ListValue> commands_; | |
93 base::ValueVector::const_iterator next_command_; | |
94 scoped_refptr<DeltaUpdateOp> current_operation_; | |
95 scoped_refptr<base::SequencedTaskRunner> task_runner_; | |
96 | |
97 DISALLOW_COPY_AND_ASSIGN(ComponentPatcher); | |
98 }; | |
99 | |
100 } // namespace component_updater | |
101 | |
102 #endif // COMPONENTS_COMPONENT_UPDATER_COMPONENT_PATCHER_H_ | |
OLD | NEW |