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// Copyright 2014 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 COMPONENTS_COMPONENT_UPDATER_COMPONENT_PATCHER_OPERATION_H_
#define COMPONENTS_COMPONENT_UPDATER_COMPONENT_PATCHER_OPERATION_H_
#include <string>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "components/component_updater/component_unpacker.h"
namespace base {
class DictionaryValue;
} // namespace base
namespace component_updater {
extern const char kOp[];
extern const char kBsdiff[];
extern const char kCourgette[];
extern const char kInput[];
extern const char kPatch[];
class ComponentInstaller;
class DeltaUpdateOp : public base::RefCountedThreadSafe<DeltaUpdateOp> {
public:
DeltaUpdateOp();
// Parses, runs, and verifies the operation. Calls |callback| with the
// result of the operation. The callback is called using |task_runner|.
void Run(const base::DictionaryValue* command_args,
const base::FilePath& input_dir,
const base::FilePath& unpack_dir,
ComponentInstaller* installer,
const ComponentUnpacker::Callback& callback,
scoped_refptr<base::SequencedTaskRunner> task_runner);
protected:
virtual ~DeltaUpdateOp();
scoped_refptr<base::SequencedTaskRunner> GetTaskRunner();
std::string output_sha256_;
base::FilePath output_abs_path_;
private:
friend class base::RefCountedThreadSafe<DeltaUpdateOp>;
ComponentUnpacker::Error CheckHash();
// Subclasses must override DoParseArguments to parse operation-specific
// arguments. DoParseArguments returns DELTA_OK on success; any other code
// represents failure.
virtual ComponentUnpacker::Error DoParseArguments(
const base::DictionaryValue* command_args,
const base::FilePath& input_dir,
ComponentInstaller* installer) = 0;
// Subclasses must override DoRun to actually perform the patching operation.
// They must call the provided callback when they have completed their
// operations. In practice, the provided callback is always for "DoneRunning".
virtual void DoRun(const ComponentUnpacker::Callback& callback) = 0;
// Callback given to subclasses for when they complete their operation.
// Validates the output, and posts a task to the patching operation's
// callback.
void DoneRunning(ComponentUnpacker::Error error, int extended_error);
ComponentUnpacker::Callback callback_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
DISALLOW_COPY_AND_ASSIGN(DeltaUpdateOp);
};
// A 'copy' operation takes a file currently residing on the disk and moves it
// into the unpacking directory: this represents "no change" in the file being
// installed.
class DeltaUpdateOpCopy : public DeltaUpdateOp {
public:
DeltaUpdateOpCopy();
private:
~DeltaUpdateOpCopy() override;
// Overrides of DeltaUpdateOp.
ComponentUnpacker::Error DoParseArguments(
const base::DictionaryValue* command_args,
const base::FilePath& input_dir,
ComponentInstaller* installer) override;
void DoRun(const ComponentUnpacker::Callback& callback) override;
base::FilePath input_abs_path_;
DISALLOW_COPY_AND_ASSIGN(DeltaUpdateOpCopy);
};
// A 'create' operation takes a full file that was sent in the delta update
// archive and moves it into the unpacking directory: this represents the
// addition of a new file, or a file so different that no bandwidth could be
// saved by transmitting a differential update.
class DeltaUpdateOpCreate : public DeltaUpdateOp {
public:
DeltaUpdateOpCreate();
private:
~DeltaUpdateOpCreate() override;
// Overrides of DeltaUpdateOp.
ComponentUnpacker::Error DoParseArguments(
const base::DictionaryValue* command_args,
const base::FilePath& input_dir,
ComponentInstaller* installer) override;
void DoRun(const ComponentUnpacker::Callback& callback) override;
base::FilePath patch_abs_path_;
DISALLOW_COPY_AND_ASSIGN(DeltaUpdateOpCreate);
};
// An interface an embedder may fulfill to enable out-of-process patching.
class OutOfProcessPatcher
: public base::RefCountedThreadSafe<OutOfProcessPatcher> {
public:
virtual void Patch(const std::string& operation,
scoped_refptr<base::SequencedTaskRunner> task_runner,
const base::FilePath& input_abs_path,
const base::FilePath& patch_abs_path,
const base::FilePath& output_abs_path,
base::Callback<void(int result)> callback) = 0;
protected:
friend class base::RefCountedThreadSafe<OutOfProcessPatcher>;
virtual ~OutOfProcessPatcher() {}
};
// Both 'bsdiff' and 'courgette' operations take an existing file on disk,
// and a bsdiff- or Courgette-format patch file provided in the delta update
// package, and run bsdiff or Courgette to construct an output file in the
// unpacking directory.
class DeltaUpdateOpPatch : public DeltaUpdateOp {
public:
// |out_of_process_patcher| may be NULL.
DeltaUpdateOpPatch(const std::string& operation,
scoped_refptr<OutOfProcessPatcher> out_of_process_patcher);
private:
~DeltaUpdateOpPatch() override;
// Overrides of DeltaUpdateOp.
ComponentUnpacker::Error DoParseArguments(
const base::DictionaryValue* command_args,
const base::FilePath& input_dir,
ComponentInstaller* installer) override;
void DoRun(const ComponentUnpacker::Callback& callback) override;
// |success_code| is the code that indicates a successful patch.
// |result| is the code the patching operation returned.
void DonePatching(const ComponentUnpacker::Callback& callback, int result);
std::string operation_;
scoped_refptr<OutOfProcessPatcher> out_of_process_patcher_;
base::FilePath patch_abs_path_;
base::FilePath input_abs_path_;
DISALLOW_COPY_AND_ASSIGN(DeltaUpdateOpPatch);
};
DeltaUpdateOp* CreateDeltaUpdateOp(
const std::string& operation,
scoped_refptr<OutOfProcessPatcher> out_of_process_patcher);
} // namespace component_updater
#endif // COMPONENTS_COMPONENT_UPDATER_COMPONENT_PATCHER_OPERATION_H_
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