PipeFilterResult DoFilter_BeforeWriting(ref SmartBuffer buffer, SortedSet <PipeFilter> filters, CancellationToken cancellationToken)
{
PipeFilterResult rt = default;
foreach (var f in filters)
{
_logger?.LogInformation($"DefaultPipe DoFilter_BeforeWriting {f.ToString()}...");
PipeFilterContext ctx = new PipeFilterContext(f.Client, buffer.Memory, buffer.SignificantLength);
try
{
rt = f.BeforeWriting(ctx);
if (!rt.Continue || cancellationToken.IsCancellationRequested)
{
buffer.Dispose();
rt.Buffer?.Dispose();
break;
}
buffer.Dispose();
buffer = rt.Buffer;
//next filter
}
catch (Exception ex)
{
_logger?.LogError(ex, $"DefaultPipe DoFilter_BeforeWriting {f.ToString()} error.");
buffer.Dispose();
rt = new PipeFilterResult(ctx.Client, null, false);
break;
}
}
return(rt);
}
PipeFilterResult ExecuteFilter_BeforeWriting(IClient client, SmartBuffer memory, SortedSet <PipeFilter> filters, CancellationToken cancellationToken)
{
SmartBuffer prevFilterMemory = memory;
bool @continue = true;
foreach (var filter in filters.Reverse())
{
try
{
var result = filter.BeforeWriting(new PipeFilterContext(client, prevFilterMemory.SignificanMemory));
prevFilterMemory.Dispose();
prevFilterMemory = result.Buffer;
@continue = result.Continue;
if (!result.Continue)
{
break;
}
if (cancellationToken.IsCancellationRequested)
{
break;
}
}
catch (Exception ex)
{
@continue = false;
_logger?.LogError(ex, $"ExecuteFilter_BeforeWriting [{client.EndPoint.ToString()}].");
}
}
return(new PipeFilterResult(client, prevFilterMemory, @continue));
}
/// <summary>
/// Write to the client.
/// </summary>
/// <param name="data"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
public async ValueTask <WriteResult> Write(ReadOnlyMemory <byte> data, CancellationToken cancellationToken)
{
if (data.IsEmpty)
{
_logger?.LogWarning($"PipeWriter Try to write empty memory. [{Client.EndPoint.ToString()}].");
return(new WriteResult(Failed, 0));
}
ReadOnlyMemory <byte> toWrite = data;
SmartBuffer filterResultBuffer = null;
if (FilterEnabled && FilterChain.Count > 0)
{
var result = ExecuteFilter(data, cancellationToken);
if (!result.Continue)
{
result.Buffer?.Dispose();
_logger?.LogInformation($"Pipe broke by filter [{Client.EndPoint.ToString()}].");
return(new WriteResult(BrokeByFilter, 0));
}
else
{
filterResultBuffer = result.Buffer;
toWrite = null != filterResultBuffer ? filterResultBuffer.SignificantMemory : ReadOnlyMemory <byte> .Empty;
}
}
_logger?.LogInformation($"{toWrite.Length} bytes left after [OnWriting] filtering.");
if (!toWrite.IsEmpty)
{
int written = await Client.WriteAsync(toWrite, cancellationToken);
filterResultBuffer?.Dispose();
if (0 >= written)
{
return(new WriteResult(Failed, written));
}
else
{
return(new WriteResult(Succeeded, written));
}
}
else
{
return(new WriteResult(Succeeded, 0));
}
}
/// <summary>
/// Execute filters.
/// </summary>
/// <param name="data"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
protected ClientFilterResult ExecuteFilter(ReadOnlyMemory <byte> data, CancellationToken cancellationToken)
{
SmartBuffer prevFilterMemory = null;
bool @continue = true;
int time = 0;
foreach (var filter in FilterChain)
{
try
{
if (time > 0 && null == prevFilterMemory)
{
@continue = true; break;
}
var result = filter.OnReading(new ClientFilterContext(Client, null == prevFilterMemory ? data : prevFilterMemory.SignificantMemory));
time++;
prevFilterMemory?.Dispose();
prevFilterMemory = result.Buffer;
@continue = result.Continue;
if (!result.Continue)
{
break;
}
if (cancellationToken.IsCancellationRequested)
{
break;
}
}
catch (Exception ex)
{
@continue = false;
_logger?.LogError(ex, $"PipeReader ExecuteFilter_OnReading [{Client.EndPoint.ToString()}].");
}
}
return(new ClientFilterResult(Client, prevFilterMemory, @continue));
}
/// <summary>
/// Execute filters.
/// </summary>
/// <param name="client"></param>
/// <param name="data"></param>
/// <param name="filters"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
ClientFilterResult ExecuteFilter_BeforeWriting(IClient client, ReadOnlyMemory <byte> data, SortedSet <IClientWriterFilter> filters, CancellationToken cancellationToken)
{
SmartBuffer prevFilterMemory = null;
bool @continue = true;
int time = 0;
foreach (var filter in filters.Reverse())//emm
{
try
{
if (time > 0 && null == prevFilterMemory)
{
@continue = true; break;
}
var result = filter.BeforeWriting(new ClientFilterContext(client, null == prevFilterMemory ? data : prevFilterMemory.SignificantMemory));
time++;
prevFilterMemory?.Dispose();
prevFilterMemory = result.Buffer;
@continue = result.Continue;
if (!result.Continue)
{
break;
}
if (cancellationToken.IsCancellationRequested)
{
break;
}
}
catch (Exception ex)
{
@continue = false;
_logger?.LogError(ex, $"ExecuteFilter_BeforeWriting [{client.EndPoint.ToString()}].");
}
}
return(new ClientFilterResult(client, prevFilterMemory, @continue));
}
async Task PipeB2A(CancellationToken cancellationToken)
{
SmartBuffer buffer = SmartBuffer.Rent(_bufferSize);//read buff
buffer.SignificantLength = await ClientB.ReadAsync(buffer.Memory, cancellationToken);
if (buffer.SignificantLength > 0)
{
if (_filtersB.Count > 0)
{
bool locked = false;
try
{
DoFilter_Lock(ref locked);
PipeFilterResult filterResult = DoFilter_AfterReading(ref buffer, _filtersB, cancellationToken);
if (!filterResult.Continue || cancellationToken.IsCancellationRequested)
{
ReportBroken();
return;
}
else
{
buffer = filterResult.Buffer;
}
DoFilter_UnLock(ref locked);
}
finally
{
DoFilter_UnLock(ref locked);
}
}//end FilterB
if (_filtersA.Count > 0)
{
bool locked = false;
try
{
DoFilter_Lock(ref locked);
PipeFilterResult filterResult = DoFilter_BeforeWriting(ref buffer, _filtersA, cancellationToken);
if (!filterResult.Continue || cancellationToken.IsCancellationRequested)
{
ReportBroken();
return;
}
else
{
buffer = filterResult.Buffer;
}
DoFilter_UnLock(ref locked);
}
finally
{
DoFilter_UnLock(ref locked);
}
}//end FilterA
int written = await ClientA.WriteAsync(buffer.Memory, cancellationToken);//Pipe
_logger?.LogInformation($"DefaultPipe Pipe B to A {written} bytes.");
if (written < 0)
{
ClientA.Close();
buffer.Dispose();
ReportBroken();
return;
}
}
else if (0 == buffer.SignificantLength)
{
_logger?.LogInformation($"DefaultPipe read = 0.");
}
else//<0
{
_logger?.LogInformation($"DefaultPipe error, read={buffer.SignificantLength}.");
ClientB.Close();
ReportBroken();
return;
}
buffer.Dispose();//free memory.
if (!cancellationToken.IsCancellationRequested)
{
await PipeB2A(cancellationToken);//continue.
}
}
