/
restful.go
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/
restful.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package otelrestful // import "go.opentelemetry.io/contrib/instrumentation/github.com/emicklei/go-restful/otelrestful"
import (
"github.com/emicklei/go-restful/v3"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
semconv "go.opentelemetry.io/otel/semconv/v1.10.0"
oteltrace "go.opentelemetry.io/otel/trace"
)
const tracerName = "go.opentelemetry.io/contrib/instrumentation/github.com/emicklei/go-restful/otelrestful"
// OTelFilter returns a restful.FilterFunction which will trace an incoming request.
//
// The service parameter should describe the name of the (virtual) server handling
// the request. Options can be applied to configure the tracer and propagators
// used for this filter.
func OTelFilter(service string, opts ...Option) restful.FilterFunction {
cfg := config{}
for _, opt := range opts {
opt.apply(&cfg)
}
if cfg.TracerProvider == nil {
cfg.TracerProvider = otel.GetTracerProvider()
}
tracer := cfg.TracerProvider.Tracer(
tracerName,
oteltrace.WithInstrumentationVersion(SemVersion()),
)
if cfg.Propagators == nil {
cfg.Propagators = otel.GetTextMapPropagator()
}
return func(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
r := req.Request
ctx := cfg.Propagators.Extract(r.Context(), propagation.HeaderCarrier(r.Header))
route := req.SelectedRoutePath()
spanName := route
ctx, span := tracer.Start(ctx, spanName,
oteltrace.WithAttributes(semconv.NetAttributesFromHTTPRequest("tcp", r)...),
oteltrace.WithAttributes(semconv.EndUserAttributesFromHTTPRequest(r)...),
oteltrace.WithAttributes(semconv.HTTPServerAttributesFromHTTPRequest(service, route, r)...),
oteltrace.WithSpanKind(oteltrace.SpanKindServer),
)
defer span.End()
// pass the span through the request context
req.Request = req.Request.WithContext(ctx)
chain.ProcessFilter(req, resp)
attrs := semconv.HTTPAttributesFromHTTPStatusCode(resp.StatusCode())
spanStatus, spanMessage := semconv.SpanStatusFromHTTPStatusCodeAndSpanKind(resp.StatusCode(), oteltrace.SpanKindServer)
span.SetAttributes(attrs...)
span.SetStatus(spanStatus, spanMessage)
}
}