public async Task Invoke(HttpContext context, ITracer tracer)
{
if (!this.options.Enabled ||
tracer == null ||
context.Request.Path.Value.EqualsPatternAny(this.options.PathBlackListPatterns))
{
await this.next.Invoke(context).AnyContext();
}
else
{
var uri = context.Request.GetUri();
object action = null;
object controller = null;
context.GetRouteData()?.Values.TryGetValue("Action", out action);
context.GetRouteData()?.Values.TryGetValue("Controller", out controller);
// dehydrate the span infos
var parentSpan = new Span(
context.Request.Headers.GetValue("x-traceid").EmptyToNull() ?? ActivityTraceId.CreateRandom().ToString() /*context.GetCorrelationId()*/, // dehydrate the span infos
context.Request.Headers.GetValue("x-spanid"));
parentSpan.SetSampled(context.Request.Headers.GetValue("x-tracesampled").To <bool>());
using (var scope = tracer.BuildSpan(
$"{LogTraceNames.Http} {action ?? context.Request.Method.ToLowerInvariant()} {uri.AbsolutePath}{(controller != null ? $" ({controller.ToString().Singularize()})" : string.Empty)}",
LogKeys.InboundRequest,
SpanKind.Server,
parentSpan)
// TODO: get service name as operationname (servicedescriptor?)
.IgnoreParentSpan()
//.SetSpanId(context.GetRequestId())
.WithTag(SpanTagKey.HttpMethod, context.Request.Method.ToLowerInvariant())
.WithTag(SpanTagKey.HttpUrl, context.Request.GetDisplayUrl())
.WithTag(SpanTagKey.HttpHost, uri.Port > 0 ? $"{uri.Host}:{uri.Port}" : uri.Host)
.WithTag(SpanTagKey.HttpPath, uri.AbsolutePath)
// TODO: request size? SpanTagKey.HttpRequestSize
.WithTag(SpanTagKey.HttpRequestId, context.GetRequestId()).Activate(this.logger))
{
try
{
if (scope.Span.IsSampled == false)
{
this.logger.LogDebug($"{{LogKey:l}} span not sampled (id={scope.Span.SpanId}, sampler={scope.Span.Tags.GetValueOrDefault(SpanTagKey.SamplerType)})", LogKeys.Tracing);
}
else
{
this.logger.LogDebug($"{{LogKey:l}} span sampled (id={scope.Span.SpanId}, sampler={scope.Span.Tags.GetValueOrDefault(SpanTagKey.SamplerType)})", LogKeys.Tracing);
}
await this.next.Invoke(context).AnyContext();
scope.Span.WithTag("http.status_code", context.Response.StatusCode);
// TODO: response size?
if (context.Response.StatusCode > 399)
{
scope.Span.SetStatus(SpanStatus.Failed, $"{context.Response.StatusCode} ({ReasonPhrases.GetReasonPhrase(context.Response.StatusCode)})");
}
else
{
scope.Span.SetStatus(SpanStatus.Succeeded, $"{context.Response.StatusCode} ({ReasonPhrases.GetReasonPhrase(context.Response.StatusCode)})");
}
}
catch (Exception ex)
{
tracer.Fail(exception: ex);
throw;
}
}
}
}