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, $"DefaultPipe DoFilter_BeforeWriting {f.ToString()} error.");
buffer.Dispose();
rt = new PipeFilterResult(ctx.Client, null, false);
break;
}
}
return(rt);
}
async Task PipeB2A(CancellationToken cancellationToken)
{
SmartBuffer buffer = SmartBuffer.Rent(_bufferSize);//read buff
buffer.SignificantLength = await ClientB.ReadAsync(buffer.Memory, cancellationToken);
if (buffer.SignificantLength > 0)
{
if (_filtersB.Count > 0)
{
bool locked = false;
try
{
DoFilter_Lock(ref locked);
PipeFilterResult filterResult = DoFilter_AfterReading(ref buffer, _filtersB, cancellationToken);
if (!filterResult.Continue || cancellationToken.IsCancellationRequested)
{
ReportBroken();
return;
}
else
{
buffer = filterResult.Buffer;
}
DoFilter_UnLock(ref locked);
}
finally
{
DoFilter_UnLock(ref locked);
}
}//end FilterB
if (_filtersA.Count > 0)
{
bool locked = false;
try
{
DoFilter_Lock(ref locked);
PipeFilterResult filterResult = DoFilter_BeforeWriting(ref buffer, _filtersA, cancellationToken);
if (!filterResult.Continue || cancellationToken.IsCancellationRequested)
{
ReportBroken();
return;
}
else
{
buffer = filterResult.Buffer;
}
DoFilter_UnLock(ref locked);
}
finally
{
DoFilter_UnLock(ref locked);
}
}//end FilterA
int written = await ClientA.WriteAsync(buffer.Memory, cancellationToken);//Pipe
_logger?.LogInformation($"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.
}
}
