// 打开指定的清单文件 (带校验)
public static bool OpenManifestFile(string filePath, string checksum, out Manifest manifest)
{
if (File.Exists(filePath))
{
using (var fs = File.OpenRead(filePath))
{
var crc = new Crc16();
crc.Update(fs);
if (crc.hex == checksum)
{
fs.Seek(0, SeekOrigin.Begin);
var bytes = new byte[fs.Position];
var read = fs.Read(bytes, 0, bytes.Length);
if (read == bytes.Length)
{
var json = Encoding.UTF8.GetString(bytes);
manifest = JsonUtility.FromJson <Manifest>(json);
return(manifest != null);
}
}
}
}
manifest = null;
return(false);
}
private void _HttpDownload(string url, int partialSize, byte[] buffer, Utils.Crc16 crc, Stream targetStream, int timeout)
{
PrintDebug($"downloading from {url}");
var uri = new Uri(url);
var req = WebRequest.CreateHttp(uri);
req.Method = WebRequestMethods.Http.Get;
req.ContentType = BundleContentType;
req.ReadWriteTimeout = 10000;
if (timeout > 0)
{
req.Timeout = timeout * 1000;
}
if (partialSize > 0)
{
req.AddRange(partialSize);
}
using (var rsp = req.GetResponse())
{
using (var webStream = rsp.GetResponseStream())
{
var recvAll = 0L;
while (recvAll < rsp.ContentLength)
{
var recv = webStream.Read(buffer, 0, buffer.Length);
if (recv > 0 && _running)
{
recvAll += recv;
targetStream.Write(buffer, 0, recv);
crc.Update(buffer, 0, recv);
_progress = Mathf.Clamp01((float)(recvAll + partialSize) / _size);
if (_slow > 0)
{
Thread.Sleep(_slow); // 模拟低速下载
}
// PrintDebug($"{recvAll + partialSize}, {_size}, {_progress}");
}
else
{
break;
}
}
}
}
// PrintDebug($"download exited");
}
// 打开指定的清单文件 (带校验)
public static Manifest ParseManifestFile(string filePath, FileEntry fileEntry, string password)
{
if (File.Exists(filePath))
{
using (var fs = File.OpenRead(filePath))
{
var crc = new Crc16();
crc.Update(fs);
if (crc.hex == fileEntry.checksum && fs.Length == fileEntry.size)
{
fs.Seek(0, SeekOrigin.Begin);
return(ParseManifestStream(fs, fileEntry, password));
}
}
}
return(null);
}
private void DownloadExec(object state)
{
var buffer = new byte[BufferSize];
var tempPath = _finalPath + PartExt;
var metaPath = _finalPath + Metadata.Ext;
var retry = 0;
FileStream fileStream = null;
while (true)
{
string error = null;
var crc = new Utils.Crc16();
var partialSize = 0;
var success = true;
if (fileStream == null)
{
try
{
if (File.Exists(tempPath)) // 处理续传
{
var fileInfo = new FileInfo(tempPath);
fileStream = fileInfo.Open(FileMode.OpenOrCreate, FileAccess.ReadWrite);
partialSize = (int)fileInfo.Length;
if (partialSize > _size) // 目标文件超过期望大小, 直接废弃
{
fileStream.SetLength(0);
partialSize = 0;
}
else if (partialSize <= _size) // 续传
{
crc.Update(fileStream);
PrintDebug($"partial check {partialSize} && {_size} ({crc.hex})");
}
}
else // 创建下载文件
{
fileStream = File.Open(tempPath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
fileStream.SetLength(0);
}
}
catch (Exception exception)
{
// PrintError($"file exception: {exception}");
error = $"file exception: {exception}";
success = false;
}
}
else
{
fileStream.SetLength(0L);
}
if (success && (_size <= 0 || partialSize < _size))
{
try
{
_HttpDownload(this.url, partialSize, buffer, crc, fileStream, _timeout);
}
catch (Exception exception)
{
// PrintError($"network exception: {exception}");
error = $"network exception: {exception}";
success = false;
}
}
if (success && fileStream.Length != _size)
{
if (_size > 0)
{
// PrintError($"filesize exception: {fileStream.Length} != {_size}");
error = $"wrong file size: {fileStream.Length} != {_size}";
success = false;
}
else
{
_size = (int)fileStream.Length;
}
}
else if (success && crc.hex != _checksum)
{
if (_checksum != null)
{
// PrintError($"checksum exception: {crc.hex} != {_checksum}");
error = $"corrupted file: {crc.hex} != {_checksum}";
success = false;
}
else
{
_checksum = crc.hex;
}
}
lock (this)
{
if (_isDone || _destroy)
{
success = false;
}
}
if (success)
{
try
{
// _WriteStream(buffer, fileStream, finalPath);
fileStream.Close();
fileStream = null;
if (File.Exists(_finalPath))
{
File.Delete(_finalPath);
}
File.Move(tempPath, _finalPath);
_WriteMetadata(metaPath);
Complete(null);
// PrintDebug("download succeeded");
break;
}
catch (Exception exception)
{
// PrintError($"write exception: {exception}");
error = $"write exception: {exception}";
success = false;
}
}
if (!Retry(++retry))
{
if (fileStream != null)
{
fileStream.Close();
fileStream = null;
}
Complete(error ?? "unknown error");
PrintError($"[stop] download failed ({error})");
break;
}
Thread.Sleep(1000);
PrintError($"[retry] ({_destroy}) download failed ({error})");
}
PrintDebug("download task thread exited");
}
private void ProcessJob(JobInfo jobInfo)
{
Debug.LogFormat("processing job: {0} ({1})", jobInfo.name, jobInfo.comment);
var tempPath = jobInfo.path + PartExt;
if (_fileStream != null)
{
_fileStream.Close();
_fileStream = null;
}
while (true)
{
string error = null;
var partialSize = 0;
var success = true;
var wsize = jobInfo.size;
var wchecksum = jobInfo.checksum;
_crc.Clear();
if (_fileStream == null)
{
try
{
var fileInfo = new FileInfo(tempPath);
if (fileInfo.Exists) // 处理续传
{
_fileStream = fileInfo.Open(FileMode.OpenOrCreate, FileAccess.ReadWrite);
partialSize = (int)fileInfo.Length;
if (partialSize > jobInfo.size) // 目标文件超过期望大小, 直接废弃
{
_fileStream.SetLength(0);
partialSize = 0;
}
else if (partialSize <= jobInfo.size) // 续传
{
_crc.Update(_fileStream);
Debug.LogFormat("partial check {0} && {1} ({2})", partialSize, jobInfo.size,
_crc.hex);
}
}
else // 创建下载文件
{
if (!Directory.Exists(fileInfo.DirectoryName))
{
Directory.CreateDirectory(fileInfo.DirectoryName);
}
_fileStream = File.Open(tempPath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
_fileStream.SetLength(0);
}
}
catch (Exception exception)
{
Debug.LogErrorFormat("file exception: {0}\n{1}", jobInfo.path, exception);
error = $"file exception: {exception}";
success = false;
}
}
else
{
_fileStream.SetLength(0L);
}
if (success && (jobInfo.size <= 0 || partialSize < jobInfo.size))
{
var url = GetUrl(jobInfo);
try
{
var uri = new Uri(url);
var req = WebRequest.CreateHttp(uri);
req.Method = WebRequestMethods.Http.Get;
req.ContentType = BundleContentType;
req.ReadWriteTimeout = 10000;
if (_timeout > 0)
{
req.Timeout = _timeout;
}
if (partialSize > 0)
{
req.AddRange(partialSize);
}
using (var rsp = req.GetResponse())
{
using (var webStream = rsp.GetResponseStream())
{
var recvAll = 0L;
var recvCalc = 0L;
var stopwatch = new Stopwatch();
stopwatch.Start();
while (recvAll < rsp.ContentLength)
{
var _bpms = Math.Max(1, jobInfo.bytesPerSecond / 10);
var recv = webStream.Read(_buffer, 0, Math.Min(_bpms, _buffer.Length));
if (recv > 0 && !_destroy)
{
recvCalc += recv;
if (recvCalc >= _bpms)
{
var millisecs = stopwatch.ElapsedMilliseconds;
var delay = (int)(100.0 * recvCalc / _bpms - millisecs);
// Debug.LogFormat("net ++ {0} {1} sbps {2} recv {3}", delay, millisecs, _bpms, recvCalc);
if (delay > 0)
{
Thread.Sleep(delay);
}
stopwatch.Restart();
recvCalc -= _bpms;
}
recvAll += recv;
_fileStream.Write(_buffer, 0, recv);
_crc.Update(_buffer, 0, recv);
jobInfo.bytes = (int)(recvAll + partialSize);
// PrintDebug($"{recvAll + partialSize}, {_size}, {_progress}");
}
else
{
break;
}
}
}
}
}
catch (Exception exception)
{
Debug.LogErrorFormat("network exception: {0}\n{1}", url, exception);
error = $"network exception: {exception}";
success = false;
}
}
if (success && _fileStream.Length != jobInfo.size)
{
if (jobInfo.size > 0)
{
error = string.Format("filesize exception: {0} {1} != {2}", jobInfo.name,
_fileStream.Length, jobInfo.size);
Debug.LogError(error);
success = false;
}
else
{
wsize = (int)_fileStream.Length;
}
}
if (success && _crc.hex != jobInfo.checksum)
{
if (!string.IsNullOrEmpty(jobInfo.checksum))
{
error = string.Format("corrupted file: {0} {1} != {2}", jobInfo.name, _crc.hex,
jobInfo.checksum);
Debug.LogError(error);
success = false;
}
else
{
wchecksum = _crc.hex;
}
}
if (_destroy)
{
success = false;
}
if (success)
{
try
{
// _WriteStream(buffer, fileStream, finalPath);
_fileStream.Close();
_fileStream = null;
if (File.Exists(jobInfo.path))
{
File.Delete(jobInfo.path);
}
File.Move(tempPath, jobInfo.path);
// 写入额外的 meta
var meta = new Metadata()
{
checksum = wchecksum,
size = wsize,
};
var json = JsonUtility.ToJson(meta);
var metaPath = jobInfo.path + Metadata.Ext;
File.WriteAllText(metaPath, json);
Complete(jobInfo);
break;
}
catch (Exception exception)
{
error = string.Format("write exception: {0}\n{1}", jobInfo.name, exception);
Debug.LogError(error);
success = false;
}
}
jobInfo.tried++;
if (jobInfo.retry > 0 && jobInfo.tried >= jobInfo.retry)
{
if (_fileStream != null)
{
_fileStream.Close();
_fileStream = null;
}
jobInfo.error = error ?? "unknown error";
Complete(jobInfo);
break;
}
Thread.Sleep(2000);
Debug.LogErrorFormat("[retry] download failed: {0}\n{1}", jobInfo.name, error);
}
}