public static IApplicationBuilder UseDataDogTracing(this IApplicationBuilder app, TraceSource source, TraceOptions options) => app.Use(async(context, next) =>
{
var resource = context.Request.Host.Host;
var path = context.Request.Path.HasValue ? context.Request.Path.Value : string.Empty;
using (var span = source.Begin("aspnet.request", options.ServiceName, resource, "web"))
using (var scope = new TraceContextScope(span))
{
if (options.AnalyticsEnabled)
{
span.SetMeta("_dd1.sr.eausr", "true");
}
span.SetMeta("http.method", context.Request.Method);
span.SetMeta("http.path", path);
span.SetMeta("http.query", context.Request.QueryString.HasValue ? context.Request.QueryString.Value : string.Empty);
try
{
await next();
}
catch (Exception ex)
{
span.SetError(ex);
throw;
}
span.SetMeta("http.status_code", context.Response.StatusCode.ToString());
}
});
static void Main(string[] args)
{
var source = new TraceSource();
var agent = new TraceAgent();
using (source.Subscribe(agent))
using (var span = source.Begin("sample-trace", "test-app", "Main", "console"))
{
TestSpan(span);
TestSpan(span);
TestSpan(span);
}
agent.OnCompleted();
agent.Completion.Wait();
}
