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// Copyright (c) 2011 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 NET_FTP_FTP_TRANSACTION_H_
#define NET_FTP_FTP_TRANSACTION_H_
#include <stdint.h>
#include "net/base/completion_once_callback.h"
#include "net/base/io_buffer.h"
#include "net/base/load_states.h"
#include "net/base/net_export.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
namespace net {
class AuthCredentials;
class FtpResponseInfo;
class FtpRequestInfo;
class NetLogWithSource;
// Represents a single FTP transaction.
class NET_EXPORT_PRIVATE FtpTransaction {
public:
// Stops any pending IO and destroys the transaction object.
virtual ~FtpTransaction() {}
// Starts the FTP transaction (i.e., sends the FTP request).
//
// Returns OK if the transaction could be started synchronously, which means
// that the request was served from the cache (only supported for directory
// listings). ERR_IO_PENDING is returned to indicate that |callback| will be
// notified once response info is available or if an IO error occurs. Any
// other return value indicates that the transaction could not be started.
//
// Regardless of the return value, the caller is expected to keep the
// request_info object alive until Destroy is called on the transaction.
//
// NOTE: The transaction is not responsible for deleting the callback object.
//
// Profiling information for the request is saved to |net_log| if non-NULL.
virtual int Start(const FtpRequestInfo* request_info,
CompletionOnceCallback callback,
const NetLogWithSource& net_log,
const NetworkTrafficAnnotationTag& traffic_annotation) = 0;
// Restarts the FTP transaction with authentication credentials.
virtual int RestartWithAuth(const AuthCredentials& credentials,
CompletionOnceCallback callback) = 0;
// Once response info is available for the transaction, response data may be
// read by calling this method.
//
// Response data is copied into the given buffer and the number of bytes
// copied is returned. ERR_IO_PENDING is returned if response data is not yet
// available. |callback| is notified when the data copy completes, and it is
// passed the number of bytes that were successfully copied. Or, if a read
// error occurs, |callback| is notified of the error. Any other negative
// return value indicates that the transaction could not be read.
//
// NOTE: The transaction is not responsible for deleting the callback object.
//
virtual int Read(IOBuffer* buf,
int buf_len,
CompletionOnceCallback callback) = 0;
// Returns the response info for this transaction or NULL if the response
// info is not available.
virtual const FtpResponseInfo* GetResponseInfo() const = 0;
// Returns the load state for this transaction.
virtual LoadState GetLoadState() const = 0;
// Returns the upload progress in bytes. If there is no upload data,
// zero will be returned.
virtual uint64_t GetUploadProgress() const = 0;
};
} // namespace net
#endif // NET_FTP_FTP_TRANSACTION_H_
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