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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.
#include "net/base/completion_callback.h"
#include "net/base/io_buffer.h"
#include "net/base/load_states.h"
#include "net/base/net_export.h"
namespace net {
class AuthCredentials;
class FtpResponseInfo;
class FtpRequestInfo;
class BoundNetLog;
// Represents a single FTP transaction.
class NET_EXPORT_PRIVATE FtpTransaction {
// 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 the
// CompletionCallback 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,
const CompletionCallback& callback,
const BoundNetLog& net_log) = 0;
// Restarts the FTP transaction with authentication credentials.
virtual int RestartWithAuth(const AuthCredentials& credentials,
const CompletionCallback& 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. The CompletionCallback 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, the CompletionCallback 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,
const CompletionCallback& 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 GetUploadProgress() const = 0;
} // namespace net