/************************ Section 结构 ************************
* Content-Length: 60408
* Content-Type:multipart/form-data; boundary=ZnGpDtePMx0KrHh_G0X99Yef9r8JZsRJSXC
*
* --ZnGpDtePMx0KrHh_G0X99Yef9r8JZsRJSXC
* Content-Disposition: form-data; name="fixedvolume"
*
* photo
* --ZnGpDtePMx0KrHh_G0X99Yef9r8JZsRJSXC
* Content-Disposition: form-data;name="72 x 72 (.png)"; filename="photo.jpg"
* Content-Type: application/octet-stream
* Content-Transfer-Encoding: binary
*
* ... binary data of the jpg ...
* --ZnGpDtePMx0KrHh_G0X99Yef9r8JZsRJSXC
* Content-Disposition: form-data;name="thumbnail"; filename="thumbnail.jpg"
* Content-Type: application/octet-stream
* Content-Transfer-Encoding: binary
*
* ... binary data of the jpg ...
* --ZnGpDtePMx0KrHh_G0X99Yef9r8JZsRJSXC
* Content-Disposition: form-data;name="00:00:06 (480 x 288)"; filename="ImageStabilization.wmv"
* Content-Type: application/octet-stream
* Content-Transfer-Encoding: binary
*
* ... binary data ...
* --ZnGpDtePMx0KrHh_G0X99Yef9r8JZsRJSXC--
****************************/
public async Task Handle()
{
// 读取boundary
var boundary = _context.Request.GetMultipartBoundary();
if (string.IsNullOrEmpty(boundary))
{
// 不支持的媒体类型
_context.Response.StatusCode = 415;
Log.Information("无Boundary，上传失败");
return;
}
SortedSetCache cache = null;
_db = new MySqlAccess(false);
// 记录已成功接收的文件，以备后续异常时删除这些文件
List <FileDesc> sucFiles = new List <FileDesc>();
try
{
var reader = new MultipartReader(boundary, _context.Request.Body);
var section = await reader.ReadNextSectionAsync(_context.RequestAborted);
var fmSection = section.AsFormDataSection();
if (fmSection != null && fmSection.Name == "fixedvolume")
{
// 选择固定卷
_volume = (await fmSection.GetValueAsync()).ToLower();
if (!Cfg.FixedVolumes.Contains(_volume))
{
// 无此固定卷，状态码：未满足前提条件
_context.Response.StatusCode = 412;
Log.Information("不存在固定卷 {0}，上传失败！", _volume);
return;
}
section = await reader.ReadNextSectionAsync(_context.RequestAborted);
}
else
{
// 选择正在使用数最低的卷
cache = new SortedSetCache(Cfg.VolumeKey);
_volume = await cache.GetMin();
// 该卷使用数加1
await cache.Increment(_volume);
}
// Section顺序：固定路径(可无)，文件，文件，缩略图，文件
// 缩略图由客户端生成，因提取视频帧耗资源，属于前面的文件
FileDesc lastFile = null;
while (section != null)
{
var fileSection = section.AsFileSection();
if (fileSection != null)
{
if (fileSection.Name == "thumbnail")
{
if (lastFile != null)
{
// 将缩略图复制到同路径
// 命名规则：原文件名添加后缀"-t.jpg"，如 143203944767549440.wmv-t.jpg
string fullPath = Path.Combine(Cfg.Root, lastFile.Path + Cfg.ThumbPostfix);
try
{
using (var writeStream = File.Create(fullPath))
{
await fileSection.FileStream.CopyToAsync(writeStream, _bufferSize, _context.RequestAborted);
}
}
catch { }
lastFile = null;
}
}
else
{
lastFile = await ReceiveFile(fileSection);
sucFiles.Add(lastFile);
}
}
section = await reader.ReadNextSectionAsync(_context.RequestAborted);
}
}
catch (Exception ex)
{
Log.Error(ex, "处理上传文件异常");
_result.Clear();
if (sucFiles.Count > 0)
{
// 删除已上传成功的文件和记录
StringBuilder sb = new StringBuilder();
foreach (var desc in sucFiles)
{
FileInfo fi = new FileInfo(Path.Combine(Cfg.Root, desc.Path));
if (fi.Exists)
{
try
{
fi.Delete();
}
catch { }
}
sb.Append(',');
sb.Append(desc.ID);
}
try
{
await _db.Exec($"delete from fsm_file where id in ({sb.ToString().TrimStart(',')})");
}
catch { }
}
}
finally
{
await _db.Close(true);
// 卷使用数减1
if (cache != null)
{
await cache.Decrement(_volume);
}
}
await Response();
}
/// <summary>
/// 初始化文件服务
/// </summary>
public static void Init()
{
// BaseDirectory程序集所在的目录，不可用Directory.GetCurrentDirectory()！
Root = Path.Combine(AppContext.BaseDirectory, "drive");
var dir = new DirectoryInfo(Root);
if (!dir.Exists)
{
dir.Create();
}
// 固定卷
var fv = Kit.GetCfg <string>("FixedVolume");
StringBuilder sb = new StringBuilder("初始化固定卷");
if (!string.IsNullOrEmpty(fv))
{
var vols = fv.Split(';');
foreach (var vol in vols)
{
var v = vol.Trim().ToLower();
if (v != string.Empty)
{
string path = Path.Combine(Root, v);
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
FixedVolumes.Add(v);
sb.Append(" ");
sb.Append(v);
}
}
}
sb.Append("，普通卷");
// 普通卷
SortedSetCache cache = new SortedSetCache(VolumeKey);
var subs = dir.GetDirectories();
if (subs != null && subs.Length > 0)
{
foreach (var sub in subs)
{
// 非固定卷
string v = sub.Name.ToLower();
if (!FixedVolumes.Contains(v))
{
Volumes.Add(sub.Name);
// 加入缓存
cache.Increment(v, 0).Wait();
sb.Append(" ");
sb.Append(v);
}
}
}
// 无普通卷时创建默认卷v0
if (Volumes.Count == 0)
{
Volumes.Add(_defaultVol);
Directory.CreateDirectory(Path.Combine(Root, _defaultVol));
cache.Increment(_defaultVol, 0).Wait();
sb.Append(" ");
sb.Append(_defaultVol);
}
Log.Information(sb.ToString());
}
