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, $"DefaultPipe DoFilter_BeforeWriting {f.ToString()} error.");
buffer.Dispose();
rt = new PipeFilterResult(ctx.Client, null, false);
break;
}
}
return(rt);
}
public override PipeFilterResult AfterReading(PipeFilterContext ctx)
{
_logger?.LogInformation($"TestPipeFilter AfterReading data={ctx.Memory.ToArray().ToHexString()}");
var newBuff = SmartBuffer.Rent(ctx.Memory.Length - 4);
ctx.Memory.Slice(4).CopyTo(newBuff.Memory);
newBuff.SignificantLength = ctx.Memory.Length - 4;
return(new PipeFilterResult(ctx.Client, newBuff, true));
}
public override PipeFilterResult BeforeWriting(PipeFilterContext ctx)
{
_logger?.LogInformation($"TestPipeFilter BeforeWriting data={ctx.Memory.ToArray().ToHexString()}");
var newBuff = SmartBuffer.Rent(ctx.Memory.Length + 4);
var p = newBuff.Memory.Span;
p[0] = 0x12;
p[1] = 0x34;
p[4] = 0xAB;
p[3] = 0xCD;
ctx.Memory.CopyTo(newBuff.Memory.Slice(4));
newBuff.SignificantLength = ctx.Memory.Length + 4;
return(new PipeFilterResult(ctx.Client, newBuff, true));
}
public abstract PipeFilterResult BeforeWriting(PipeFilterContext filterContext);
public abstract PipeFilterResult AfterReading(PipeFilterContext filterContext);