mirror of
https://github.com/grafana/grafana.git
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67 lines
2.2 KiB
Go
67 lines
2.2 KiB
Go
package httpclientprovider
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import (
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"fmt"
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"net/http"
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"net/http/httptrace"
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"strconv"
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"github.com/grafana/grafana-plugin-sdk-go/backend/httpclient"
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"go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/codes"
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semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
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"go.opentelemetry.io/otel/trace"
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"github.com/grafana/grafana/pkg/infra/log"
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"github.com/grafana/grafana/pkg/infra/tracing"
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)
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const (
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TracingMiddlewareName = "tracing"
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httpContentLengthTagKey = "http.content_length"
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)
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func TracingMiddleware(logger log.Logger, tracer tracing.Tracer) httpclient.Middleware {
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return httpclient.NamedMiddlewareFunc(TracingMiddlewareName, func(opts httpclient.Options, next http.RoundTripper) http.RoundTripper {
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return httpclient.RoundTripperFunc(func(req *http.Request) (*http.Response, error) {
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ctx, span := tracer.Start(req.Context(), "HTTP Outgoing Request", trace.WithSpanKind(trace.SpanKindClient))
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defer span.End()
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ctx = httptrace.WithClientTrace(ctx, otelhttptrace.NewClientTrace(ctx, otelhttptrace.WithoutSubSpans(), otelhttptrace.WithoutHeaders()))
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req = req.WithContext(ctx)
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for k, v := range opts.Labels {
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span.SetAttributes(attribute.String(k, v))
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}
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tracer.Inject(ctx, req.Header, span)
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res, err := next.RoundTrip(req)
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span.SetAttributes(semconv.HTTPURL(req.URL.String()))
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span.SetAttributes(semconv.HTTPMethod(req.Method))
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// ext.SpanKind.Set(span, ext.SpanKindRPCClientEnum)
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if err != nil {
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span.SetStatus(codes.Error, "request failed")
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span.RecordError(err)
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return res, err
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}
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if res != nil {
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// we avoid measuring contentlength less than zero because it indicates
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// that the content size is unknown. https://godoc.org/github.com/badu/http#Response
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if res.ContentLength > 0 {
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span.SetAttributes(attribute.Int64(httpContentLengthTagKey, res.ContentLength))
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}
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span.SetAttributes(semconv.HTTPStatusCode(res.StatusCode))
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if res.StatusCode >= 400 {
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span.SetStatus(codes.Error, fmt.Sprintf("error with HTTP status code %s", strconv.Itoa(res.StatusCode)))
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}
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}
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return res, err
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})
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})
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}
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