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fasthttp.go
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fasthttp.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016 Datadog, Inc.
// Package fasthttp provides functions to trace the valyala/fasthttp package (https://github.com/valyala/fasthttp)
package fasthttp // import "github.com/nowfred/dd-trace-go/contrib/valyala/fasthttp.v1"
import (
"fmt"
"strconv"
"github.com/nowfred/dd-trace-go/contrib/internal/fasthttptrace"
"github.com/nowfred/dd-trace-go/ddtrace"
"github.com/nowfred/dd-trace-go/ddtrace/ext"
"github.com/nowfred/dd-trace-go/ddtrace/tracer"
"github.com/nowfred/dd-trace-go/internal/log"
"github.com/nowfred/dd-trace-go/internal/telemetry"
"github.com/valyala/fasthttp"
)
const componentName = "valyala/fasthttp.v1"
func init() {
telemetry.LoadIntegration(componentName)
tracer.MarkIntegrationImported(componentName)
}
// WrapHandler wraps a fasthttp.RequestHandler with tracing middleware
func WrapHandler(h fasthttp.RequestHandler, opts ...Option) fasthttp.RequestHandler {
cfg := newConfig()
for _, fn := range opts {
fn(cfg)
}
log.Debug("contrib/valyala/fasthttp.v1: Configuring Middleware: cfg: %#v", cfg)
spanOpts := []tracer.StartSpanOption{
tracer.ServiceName(cfg.serviceName),
}
return func(fctx *fasthttp.RequestCtx) {
if cfg.ignoreRequest(fctx) {
h(fctx)
return
}
spanOpts = append(spanOpts, defaultSpanOptions(fctx)...)
fcc := &fasthttptrace.HTTPHeadersCarrier{
ReqHeader: &fctx.Request.Header,
}
if sctx, err := tracer.Extract(fcc); err == nil {
spanOpts = append(spanOpts, tracer.ChildOf(sctx))
}
span := fasthttptrace.StartSpanFromContext(fctx, "http.request", spanOpts...)
defer span.Finish()
h(fctx)
span.SetTag(ext.ResourceName, cfg.resourceNamer(fctx))
status := fctx.Response.StatusCode()
if cfg.isStatusError(status) {
span.SetTag(ext.Error, fmt.Errorf("%d: %s", status, string(fctx.Response.Body())))
}
span.SetTag(ext.HTTPCode, strconv.Itoa(status))
}
}
func defaultSpanOptions(fctx *fasthttp.RequestCtx) []tracer.StartSpanOption {
opts := []ddtrace.StartSpanOption{
tracer.Tag(ext.Component, componentName),
tracer.Tag(ext.SpanKind, ext.SpanKindServer),
tracer.SpanType(ext.SpanTypeWeb),
tracer.Tag(ext.HTTPMethod, string(fctx.Method())),
tracer.Tag(ext.HTTPURL, string(fctx.URI().FullURI())),
tracer.Tag(ext.HTTPUserAgent, string(fctx.UserAgent())),
tracer.Measured(),
}
if host := string(fctx.Host()); len(host) > 0 {
opts = append(opts, tracer.Tag("http.host", host))
}
return opts
}