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package client
import (
"fmt"
"net/http"
"github.com/go-openapi/strfmt"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/opentracing/opentracing-go/log"
"github.com/go-openapi/runtime"
)
type tracingTransport struct {
transport runtime.ClientTransport
host string
opts []opentracing.StartSpanOption
}
func newOpenTracingTransport(transport runtime.ClientTransport, host string, opts []opentracing.StartSpanOption,
) runtime.ClientTransport {
return &tracingTransport{
transport: transport,
host: host,
opts: opts,
}
}
func (t *tracingTransport) Submit(op *runtime.ClientOperation) (interface{}, error) {
if op.Context == nil {
return t.transport.Submit(op)
}
params := op.Params
reader := op.Reader
var span opentracing.Span
defer func() {
if span != nil {
span.Finish()
}
}()
op.Params = runtime.ClientRequestWriterFunc(func(req runtime.ClientRequest, reg strfmt.Registry) error {
span = createClientSpan(op, req.GetHeaderParams(), t.host, t.opts)
return params.WriteToRequest(req, reg)
})
op.Reader = runtime.ClientResponseReaderFunc(func(response runtime.ClientResponse, consumer runtime.Consumer) (interface{}, error) {
if span != nil {
code := response.Code()
ext.HTTPStatusCode.Set(span, uint16(code))
if code >= 400 {
ext.Error.Set(span, true)
}
}
return reader.ReadResponse(response, consumer)
})
submit, err := t.transport.Submit(op)
if err != nil && span != nil {
ext.Error.Set(span, true)
span.LogFields(log.Error(err))
}
return submit, err
}
func createClientSpan(op *runtime.ClientOperation, header http.Header, host string,
opts []opentracing.StartSpanOption) opentracing.Span {
ctx := op.Context
span := opentracing.SpanFromContext(ctx)
if span != nil {
opts = append(opts, ext.SpanKindRPCClient)
span, _ = opentracing.StartSpanFromContextWithTracer(
ctx, span.Tracer(), operationName(op), opts...)
ext.Component.Set(span, "go-openapi")
ext.PeerHostname.Set(span, host)
span.SetTag("http.path", op.PathPattern)
ext.HTTPMethod.Set(span, op.Method)
_ = span.Tracer().Inject(
span.Context(),
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(header))
return span
}
return nil
}
func operationName(op *runtime.ClientOperation) string {
if op.ID != "" {
return op.ID
}
return fmt.Sprintf("%s_%s", op.Method, op.PathPattern)
}