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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package otelhttptrace // import "go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace"
import (
"context"
"net/http"
"go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace/internal/semconvutil"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/baggage"
"go.opentelemetry.io/otel/propagation"
semconv "go.opentelemetry.io/otel/semconv/v1.20.0"
"go.opentelemetry.io/otel/trace"
)
// Option allows configuration of the httptrace Extract()
// and Inject() functions.
type Option interface {
apply(*config)
}
type optionFunc func(*config)
func (o optionFunc) apply(c *config) {
o(c)
}
type config struct {
propagators propagation.TextMapPropagator
}
func newConfig(opts []Option) *config {
c := &config{propagators: otel.GetTextMapPropagator()}
for _, o := range opts {
o.apply(c)
}
return c
}
// WithPropagators sets the propagators to use for Extraction and Injection.
func WithPropagators(props propagation.TextMapPropagator) Option {
return optionFunc(func(c *config) {
if props != nil {
c.propagators = props
}
})
}
// Extract returns the Attributes, Context Entries, and SpanContext that were encoded by Inject.
func Extract(ctx context.Context, req *http.Request, opts ...Option) ([]attribute.KeyValue, baggage.Baggage, trace.SpanContext) {
c := newConfig(opts)
ctx = c.propagators.Extract(ctx, propagation.HeaderCarrier(req.Header))
attrs := append(semconvutil.HTTPServerRequest("", req), semconvutil.NetTransport("tcp"))
if req.ContentLength > 0 {
a := semconv.HTTPRequestContentLength(int(req.ContentLength))
attrs = append(attrs, a)
}
return attrs, baggage.FromContext(ctx), trace.SpanContextFromContext(ctx)
}
// Inject sets attributes, context entries, and span context from ctx into
// the request.
func Inject(ctx context.Context, req *http.Request, opts ...Option) {
c := newConfig(opts)
c.propagators.Inject(ctx, propagation.HeaderCarrier(req.Header))
}
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