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tracing.go
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tracing.go
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package openpolicyagent
import (
"net/http"
"github.com/open-policy-agent/opa/plugins"
opatracing "github.com/open-policy-agent/opa/tracing"
"github.com/opentracing/opentracing-go"
"github.com/zalando/skipper/logging"
"github.com/zalando/skipper/proxy"
)
const (
spanNameHttpOut = "open-policy-agent.http"
)
func init() {
opatracing.RegisterHTTPTracing(&tracingFactory{})
}
type tracingFactory struct{}
type transport struct {
tracer opentracing.Tracer
bundleName string
manager *plugins.Manager
wrapped http.RoundTripper
}
func WithTracingOptTracer(tracer opentracing.Tracer) func(*transport) {
return func(t *transport) {
t.tracer = tracer
}
}
func WithTracingOptBundleName(bundleName string) func(*transport) {
return func(t *transport) {
t.bundleName = bundleName
}
}
func WithTracingOptManager(manager *plugins.Manager) func(*transport) {
return func(t *transport) {
t.manager = manager
}
}
func (*tracingFactory) NewTransport(tr http.RoundTripper, opts opatracing.Options) http.RoundTripper {
log := &logging.DefaultLog{}
wrapper := &transport{
wrapped: tr,
}
for _, o := range opts {
opt, ok := o.(func(*transport))
if !ok {
log.Warnf("invalid type for OPA tracing option, expected func(*transport) got %T, tracing information might be incomplete", o)
} else {
opt(wrapper)
}
}
return wrapper
}
func (*tracingFactory) NewHandler(f http.Handler, label string, opts opatracing.Options) http.Handler {
return f
}
func (tr *transport) RoundTrip(req *http.Request) (*http.Response, error) {
ctx := req.Context()
spanOpts := []opentracing.StartSpanOption{opentracing.Tags{
proxy.HTTPMethodTag: req.Method,
proxy.HTTPUrlTag: req.URL.String(),
proxy.HostnameTag: req.Host,
proxy.HTTPPathTag: req.URL.Path,
proxy.ComponentTag: "skipper",
proxy.SpanKindTag: proxy.SpanKindClient,
}}
var span opentracing.Span
if parentSpan := opentracing.SpanFromContext(ctx); parentSpan != nil {
spanOpts = append(spanOpts, opentracing.ChildOf(parentSpan.Context()))
span = parentSpan.Tracer().StartSpan(spanNameHttpOut, spanOpts...)
} else if tr.tracer != nil {
span = tr.tracer.StartSpan(spanNameHttpOut, spanOpts...)
}
if span != nil {
defer span.Finish()
setSpanTags(span, tr.bundleName, tr.manager)
req = req.WithContext(opentracing.ContextWithSpan(ctx, span))
carrier := opentracing.HTTPHeadersCarrier(req.Header)
span.Tracer().Inject(span.Context(), opentracing.HTTPHeaders, carrier)
}
resp, err := tr.wrapped.RoundTrip(req)
if err != nil && span != nil {
span.SetTag("error", true)
span.LogKV("event", "error", "message", err.Error())
}
return resp, err
}