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middleware.go
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middleware.go
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package opentrace
import (
"github.com/opentracing/opentracing-go"
"net/http"
)
type (
// Transport is used for the HTTP Client transport, it implements the RoundTripper interface
Transport struct {
// InterruptOnError
// E.g. HTTP request will be interrupted upon a tracer.Inject error
InterruptOnError bool
spanner Spanner
injector Injector
tracer opentracing.Tracer
}
roundTripperFn func(r *http.Request) (*http.Response, error)
)
// NewTransport returns http.RoundTripper
func NewTransport() *Transport {
return &Transport{
spanner: new(StandardSpanner),
injector: new(HTTPHeadersInjector),
}
}
// Transport middleware function
func (o *Transport) RoundTripper(next http.RoundTripper) http.RoundTripper {
return roundTripperFn(func(request *http.Request) (*http.Response, error) {
var (
span opentracing.Span
tracer opentracing.Tracer
)
if tracer = o.tracer; tracer == nil {
tracer = opentracing.GlobalTracer()
}
if span = o.spanner.OnRequest(tracer, request); span == nil {
return next.RoundTrip(request)
}
r := request
if err := o.injector.Inject(tracer, span.Context(), &r); err != nil && o.InterruptOnError {
return nil, err
}
response, err := next.RoundTrip(r)
o.spanner.OnResponse(span, response, err)
return response, err
})
}
// WithInterruptOnError sets a flag
func (o *Transport) WithInterruptOnError(flag bool) *Transport {
o.InterruptOnError = flag
return o
}
// WithSpanner sets a spanner
func (o *Transport) WithSpanner(spanner Spanner) *Transport {
o.spanner = spanner
return o
}
// WithInjector sets an injector
func (o *Transport) WithInjector(injector Injector) *Transport {
o.injector = injector
return o
}
// WithTracer sets a tracer
func (o *Transport) WithTracer(tracer opentracing.Tracer) *Transport {
o.tracer = tracer
return o
}
// RoundTrip
func (f roundTripperFn) RoundTrip(request *http.Request) (*http.Response, error) {
return f(request)
}