private async Task PersistentAsync(
string name,
Stream stream,
bool overrideExisting = false,
CancellationToken cancellationToken = default)
{
var blobInfoStoreType = Configuration.GetConfigurationOrDefault(
DigniteAbpBlobContainerConfigurationNames.BlobInfoStore,
typeof(NullBlobInfoStore)
);
using (var scope = ServiceProvider.CreateScope())
{
var blobInfoStore = scope.ServiceProvider
.GetRequiredService(blobInfoStoreType)
.As <IBlobInfoStore>();
if (blobInfoStore is NullBlobInfoStore)
{
// 保存到容器中
await base.SaveAsync(name, stream, overrideExisting, cancellationToken);
}
else
{
// 计算stream hash
var hash = stream.ToMd5();
var blobInfo = new BasicBlobInfo(ContainerName, name)
{
};
if (await blobInfoStore.HashExistsAsync(ContainerName, hash, cancellationToken))
{
// 如果存在相同hash的blob，则创建其副本
var mainBlob = await blobInfoStore.FindByHashAsync(ContainerName, hash, cancellationToken);
blobInfo.ReferBlobName = mainBlob.BlobName;
// 记录Blob信息
await blobInfoStore.CreateAsync(blobInfo, cancellationToken);
}
else
{
blobInfo.BinarySize = stream.Length;
blobInfo.Hash = hash;
// 记录Blob信息；
//这里是在保存blob stream 前创建数据库记录，当后续发生异常时，希望能自动回滚本次操作；
await blobInfoStore.CreateAsync(blobInfo, cancellationToken);
// 保存到容器中
await base.SaveAsync(name, stream, overrideExisting, cancellationToken);
}
}
}
}
public Task CreateAsync(BasicBlobInfo blobInfo, CancellationToken cancellationToken = default)
{
return(Task.CompletedTask);
}
public async Task <IBlobInfo> FindByHashAsync(string containerName, string hash, CancellationToken cancellationToken = default)
{
BasicBlobInfo blobInfo = null;
return(await Task.FromResult(blobInfo));
}