mirror of
https://github.com/featurebasedb/featurebase.git
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63 lines
2 KiB
Go
63 lines
2 KiB
Go
// Copyright 2022 Molecula Corp. (DBA FeatureBase).
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// SPDX-License-Identifier: Apache-2.0
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package opentracing
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import (
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"context"
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"net/http"
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"github.com/featurebasedb/featurebase/v3/logger"
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"github.com/featurebasedb/featurebase/v3/tracing"
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"github.com/opentracing/opentracing-go"
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"github.com/opentracing/opentracing-go/ext"
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)
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// Ensure type implements interface.
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var _ tracing.Tracer = (*Tracer)(nil)
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// Tracer represents a wrapper for OpenTracing that implements tracing.Tracer.
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type Tracer struct {
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tracer opentracing.Tracer
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logger logger.Logger
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}
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// NewTracer returns a new instance of Tracer.
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func NewTracer(tracer opentracing.Tracer, logger logger.Logger) *Tracer {
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return &Tracer{tracer: tracer, logger: logger}
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}
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// StartSpanFromContext returns a new child span and context from a given context.
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func (t *Tracer) StartSpanFromContext(ctx context.Context, operationName string) (tracing.Span, context.Context) {
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var opts []opentracing.StartSpanOption
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if parent := opentracing.SpanFromContext(ctx); parent != nil {
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opts = append(opts, opentracing.ChildOf(parent.Context()))
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}
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span := t.tracer.StartSpan(operationName, opts...)
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return span, opentracing.ContextWithSpan(ctx, span)
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}
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// InjectHTTPHeaders adds the required HTTP headers to pass context between nodes.
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func (t *Tracer) InjectHTTPHeaders(r *http.Request) {
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if span := opentracing.SpanFromContext(r.Context()); span != nil {
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if err := t.tracer.Inject(
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span.Context(),
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opentracing.HTTPHeaders,
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opentracing.HTTPHeadersCarrier(r.Header),
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); err != nil {
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t.logger.Errorf("opentracing inject error: %s", err)
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}
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}
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}
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// ExtractHTTPHeaders reads the HTTP headers to derive incoming context.
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func (t *Tracer) ExtractHTTPHeaders(r *http.Request) (tracing.Span, context.Context) {
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// Deserialize tracing context into request.
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wireContext, _ := t.tracer.Extract(
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opentracing.HTTPHeaders,
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opentracing.HTTPHeadersCarrier(r.Header),
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)
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span := t.tracer.StartSpan("HTTP", ext.RPCServerOption(wireContext))
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ctx := opentracing.ContextWithSpan(r.Context(), span)
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return span, ctx
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}
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