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// Copyright (c) 2011 The Chromium OS 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 UPDATE_ENGINE_DOWNLOAD_ACTION_H_
#define UPDATE_ENGINE_DOWNLOAD_ACTION_H_
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <memory>
#include <string>
#include <curl/curl.h>
#include "update_engine/action.h"
#include "update_engine/delta_performer.h"
#include "update_engine/http_fetcher.h"
#include "update_engine/install_plan.h"
#include "update_engine/system_state.h"
// The Download Action downloads a specified url to disk. The url should point
// to an update in a delta payload format. The payload will be piped into a
// DeltaPerformer that will apply the delta to the disk.
namespace chromeos_update_engine {
class DownloadActionDelegate {
public:
// Called right before starting the download with |active| set to
// true. Called after completing the download with |active| set to
// false.
virtual void SetDownloadStatus(bool active) = 0;
// Called periodically after bytes are received. This method will be
// invoked only if the download is active. |bytes_received| is the
// number of bytes downloaded thus far. |total| is the number of
// bytes expected.
virtual void BytesReceived(uint64_t bytes_received, uint64_t total) = 0;
};
class PrefsInterface;
class DownloadAction : public InstallPlanAction,
public HttpFetcherDelegate {
public:
// Takes ownership of the passed in HttpFetcher. Useful for testing.
// A good calling pattern is:
// DownloadAction(prefs, system_state, new WhateverHttpFetcher);
DownloadAction(PrefsInterface* prefs,
SystemState* system_state,
HttpFetcher* http_fetcher);
virtual ~DownloadAction();
void PerformAction();
void TerminateProcessing();
// Testing
void SetTestFileWriter(FileWriter* writer) {
writer_ = writer;
}
int GetHTTPResponseCode() { return http_fetcher_->http_response_code(); }
// Debugging/logging
static std::string StaticType() { return "DownloadAction"; }
std::string Type() const { return StaticType(); }
// HttpFetcherDelegate methods (see http_fetcher.h)
virtual void ReceivedBytes(HttpFetcher *fetcher,
const char* bytes, int length);
virtual void SeekToOffset(off_t offset);
virtual void TransferComplete(HttpFetcher *fetcher, bool successful);
virtual void TransferTerminated(HttpFetcher *fetcher);
DownloadActionDelegate* delegate() const { return delegate_; }
void set_delegate(DownloadActionDelegate* delegate) {
delegate_ = delegate;
}
HttpFetcher* http_fetcher() { return http_fetcher_.get(); }
// Returns the p2p file id for the file being written or the empty
// string if we're not writing to a p2p file.
std::string p2p_file_id() { return p2p_file_id_; }
private:
// Closes the file descriptor for the p2p file being written and
// clears |p2p_file_id_| to indicate that we're no longer sharing
// the file. If |delete_p2p_file| is True, also deletes the file.
// If there is no p2p file descriptor, this method does nothing.
void CloseP2PSharingFd(bool delete_p2p_file);
// Starts sharing the p2p file. Must be called before
// WriteToP2PFile(). Returns True if this worked.
bool SetupP2PSharingFd();
// Writes |length| bytes of payload from |data| into |file_offset|
// of the p2p file. Also does sanity checks; for example ensures we
// don't end up with a file with holes in it.
//
// This method does nothing if SetupP2PSharingFd() hasn't been
// called or if CloseP2PSharingFd() has been called.
void WriteToP2PFile(const char *data, size_t length, off_t file_offset);
// The InstallPlan passed in
InstallPlan install_plan_;
// Update Engine preference store.
PrefsInterface* prefs_;
// Global context for the system.
SystemState* system_state_;
// Pointer to the HttpFetcher that does the http work.
std::unique_ptr<HttpFetcher> http_fetcher_;
// The FileWriter that downloaded data should be written to. It will
// either point to *decompressing_file_writer_ or *delta_performer_.
FileWriter* writer_;
std::unique_ptr<DeltaPerformer> delta_performer_;
// Used by TransferTerminated to figure if this action terminated itself or
// was terminated by the action processor.
ErrorCode code_;
// For reporting status to outsiders
DownloadActionDelegate* delegate_;
uint64_t bytes_received_;
// The file-id for the file we're sharing or the empty string
// if we're not using p2p to share.
std::string p2p_file_id_;
// The file descriptor for the p2p file used for caching the payload or -1
// if we're not using p2p to share.
int p2p_sharing_fd_;
// Set to |false| if p2p file is not visible.
bool p2p_visible_;
DISALLOW_COPY_AND_ASSIGN(DownloadAction);
};
// We want to be sure that we're compiled with large file support on linux,
// just in case we find ourselves downloading large images.
COMPILE_ASSERT(8 == sizeof(off_t), off_t_not_64_bit);
} // namespace chromeos_update_engine
#endif // UPDATE_ENGINE_DOWNLOAD_ACTION_H_