/// <summary>
/// 增量下载文件
/// </summary>
/// <param name="storageNode">GetStorageNode方法返回的存储节点</param>
/// <param name="fileName">文件名</param>
/// <param name="offset">从文件起始点的偏移量</param>
/// <param name="length">要读取的字节数</param>
/// <returns>文件内容</returns>
public static byte[] DownloadFile(StorageNode storageNode, string fileName, long offset, long length)
{
fileName = GetFileName(storageNode.GroupName, fileName);
using (var storageReqeust = DOWNLOAD_FILE.CreateRequest(storageNode.EndPoint, offset, length, storageNode.GroupName, fileName))
{
var storageResponse = new DOWNLOAD_FILE.Response(storageReqeust.GetStorageResponse());
return(storageResponse.Content);
}
}
/// <summary>
/// 异步下载
/// </summary>
/// <param name="storageNode"></param>
/// <param name="fileName"></param>
/// <returns></returns>
public static async Task <byte[]> DownloadFileAsync(StorageNode storageNode, string fileName)
{
fileName = GetFileName(storageNode.GroupName, fileName);
using (var storageReqeust = DOWNLOAD_FILE.CreateRequest(storageNode.EndPoint, 0L, 0L, storageNode.GroupName, fileName))
{
Task <byte[]> task = null; // storageReqeust.ReadBytesAsync();
await task;
return(task.Result);
}
}
public override FDFSRequest GetRequest(params object[] paramList)
{
if (paramList.Length != 4)
{
throw new FDFSException("param count is wrong");
}
var storageNode = (StorageNode)paramList[0];
var fileName = (string)paramList[1];
var offsetInfo = (Tuple <long, long>)paramList[2];
var downloadFile = new DOWNLOAD_FILE
{
ConnectionType = FDFSConnectionType.StorageConnection,
EndPoint = storageNode.EndPoint,
Callback = (IDownloadCallback)paramList[3]
};
var groupNameByteCount = Util.StringByteCount(storageNode.GroupName);
if (groupNameByteCount > 16)
{
throw new FDFSException("groupName is too long");
}
var fileNameByteCount = Util.StringByteCount(fileName);
int length = 16 + 16 + fileNameByteCount;
downloadFile.SetBodyBuffer(length);
int offset = 0;
Util.LongToBuffer(offsetInfo.Item1, downloadFile.BodyBuffer, offset);
offset += 8;
Util.LongToBuffer(offsetInfo.Item2, downloadFile.BodyBuffer, offset);
offset += 8;
Util.StringToByte(storageNode.GroupName, downloadFile.BodyBuffer, offset, groupNameByteCount);
if (groupNameByteCount < 16)
{
for (var i = offset + groupNameByteCount; i < offset + 16; i++)
{
downloadFile.BodyBuffer[i] = 0;
}
}
offset += 16;
Util.StringToByte(fileName, downloadFile.BodyBuffer, offset, fileNameByteCount);
downloadFile.Header = new FDFSHeader(length, FDFSConstants.STORAGE_PROTO_CMD_DOWNLOAD_FILE, 0);
return(downloadFile);
}
/// <summary>
/// 下载文件
/// </summary>
/// <param name="storageNode">GetStorageNode方法返回的存储节点</param>
/// <param name="fileName">文件名</param>
/// <exception cref="System.Exception">读取网络资源异常</exception>
/// <returns>文件内容</returns>
public static byte[] DownloadFile(StorageNode storageNode, string fileName)
{
fileName = GetFileName(storageNode.GroupName, fileName);
using (var storageReqeust = DOWNLOAD_FILE.CreateRequest(storageNode.EndPoint, 0L, 0L, storageNode.GroupName, fileName))
{
// 同步下载
var storageResponse = new DOWNLOAD_FILE.Response(storageReqeust.GetStorageResponse());
if (storageResponse.Content == null)
{
throw new System.Exception(storageReqeust.Message);
}
return(storageResponse.Content);
}
}
/// <summary>
///
/// </summary>
/// <param name="paramList">
/// 1,IPEndPoint IPEndPoint-->the storage IPEndPoint
/// 2,long offset-->file offset
/// 3,long byteSize -->download file bytes
/// 4,string groupName
/// 5,string fileName
/// </param>
/// <returns></returns>
public override FDFSRequest GetRequest(params object[] paramList)
{
if (paramList.Length != 5)
{
throw new FDFSException("param count is wrong");
}
IPEndPoint endPoint = (IPEndPoint)paramList[0];
long offset = (long)paramList[1];
long byteSize = (long)paramList[2];
string groupName = (string)paramList[3];
string fileName = (string)paramList[4];
DOWNLOAD_FILE result = new DOWNLOAD_FILE();
result.Connection = ConnectionManager.GetStorageConnection(endPoint);
if (groupName.Length > Consts.FDFS_GROUP_NAME_MAX_LEN)
{
throw new FDFSException("groupName is too long");
}
long length = Consts.FDFS_PROTO_PKG_LEN_SIZE +
Consts.FDFS_PROTO_PKG_LEN_SIZE +
Consts.FDFS_GROUP_NAME_MAX_LEN +
fileName.Length;
byte[] bodyBuffer = new byte[length];
byte[] offsetBuffer = Util.LongToBuffer(offset);
byte[] byteSizeBuffer = Util.LongToBuffer(byteSize);
byte[] groupNameBuffer = Util.StringToByte(groupName);
byte[] fileNameBuffer = Util.StringToByte(fileName);
Array.Copy(offsetBuffer, 0, bodyBuffer, 0, offsetBuffer.Length);
Array.Copy(byteSizeBuffer, 0, bodyBuffer, Consts.FDFS_PROTO_PKG_LEN_SIZE, byteSizeBuffer.Length);
Array.Copy(groupNameBuffer, 0, bodyBuffer, Consts.FDFS_PROTO_PKG_LEN_SIZE +
Consts.FDFS_PROTO_PKG_LEN_SIZE, groupNameBuffer.Length);
Array.Copy(fileNameBuffer, 0, bodyBuffer, Consts.FDFS_PROTO_PKG_LEN_SIZE +
Consts.FDFS_PROTO_PKG_LEN_SIZE + Consts.FDFS_GROUP_NAME_MAX_LEN, fileNameBuffer.Length);
result.Body = bodyBuffer;
result.Header = new FDFSHeader(length, Consts.STORAGE_PROTO_CMD_DOWNLOAD_FILE, 0);
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="paramList">
/// 1,IPEndPoint IPEndPoint-->the storage IPEndPoint
/// 2,long offset-->file offset
/// 3,long byteSize -->download file bytes
/// 4,string groupName
/// 5,string fileName
/// </param>
/// <returns></returns>
public override FDFSRequest GetRequest(params object[] paramList)
{
if (paramList.Length != 5)
throw new FDFSException("param count is wrong");
IPEndPoint endPoint = (IPEndPoint)paramList[0];
long offset = (long)paramList[1];
long byteSize = (long)paramList[2];
string groupName = (string)paramList[3];
string fileName = (string)paramList[4];
DOWNLOAD_FILE result = new DOWNLOAD_FILE();
result.Connection = ConnectionManager.GetStorageConnection(endPoint);
if (groupName.Length > Consts.FDFS_GROUP_NAME_MAX_LEN)
throw new FDFSException("groupName is too long");
long length = Consts.FDFS_PROTO_PKG_LEN_SIZE +
Consts.FDFS_PROTO_PKG_LEN_SIZE +
Consts.FDFS_GROUP_NAME_MAX_LEN +
fileName.Length;
byte[] bodyBuffer = new byte[length];
byte[] offsetBuffer = Util.LongToBuffer(offset);
byte[] byteSizeBuffer = Util.LongToBuffer(byteSize);
byte[] groupNameBuffer = Util.StringToByte(groupName);
byte[] fileNameBuffer = Util.StringToByte(fileName);
Array.Copy(offsetBuffer, 0, bodyBuffer, 0, offsetBuffer.Length);
Array.Copy(byteSizeBuffer, 0, bodyBuffer, Consts.FDFS_PROTO_PKG_LEN_SIZE, byteSizeBuffer.Length);
Array.Copy(groupNameBuffer, 0, bodyBuffer, Consts.FDFS_PROTO_PKG_LEN_SIZE +
Consts.FDFS_PROTO_PKG_LEN_SIZE, groupNameBuffer.Length);
Array.Copy(fileNameBuffer, 0, bodyBuffer, Consts.FDFS_PROTO_PKG_LEN_SIZE +
Consts.FDFS_PROTO_PKG_LEN_SIZE + Consts.FDFS_GROUP_NAME_MAX_LEN, fileNameBuffer.Length);
result.Body = bodyBuffer;
result.Header = new FDFSHeader(length, Consts.STORAGE_PROTO_CMD_DOWNLOAD_FILE, 0);
return result;
}
