diff options
Diffstat (limited to 'vendor/github.com/opentracing/opentracing-go/gocontext.go')
-rw-r--r-- | vendor/github.com/opentracing/opentracing-go/gocontext.go | 54 |
1 files changed, 0 insertions, 54 deletions
diff --git a/vendor/github.com/opentracing/opentracing-go/gocontext.go b/vendor/github.com/opentracing/opentracing-go/gocontext.go deleted file mode 100644 index 05a62e70b..000000000 --- a/vendor/github.com/opentracing/opentracing-go/gocontext.go +++ /dev/null @@ -1,54 +0,0 @@ -package opentracing - -import "context" - -type contextKey struct{} - -var activeSpanKey = contextKey{} - -// ContextWithSpan returns a new `context.Context` that holds a reference to -// `span`'s SpanContext. -func ContextWithSpan(ctx context.Context, span Span) context.Context { - return context.WithValue(ctx, activeSpanKey, span) -} - -// SpanFromContext returns the `Span` previously associated with `ctx`, or -// `nil` if no such `Span` could be found. -// -// NOTE: context.Context != SpanContext: the former is Go's intra-process -// context propagation mechanism, and the latter houses OpenTracing's per-Span -// identity and baggage information. -func SpanFromContext(ctx context.Context) Span { - val := ctx.Value(activeSpanKey) - if sp, ok := val.(Span); ok { - return sp - } - return nil -} - -// StartSpanFromContext starts and returns a Span with `operationName`, using -// any Span found within `ctx` as a ChildOfRef. If no such parent could be -// found, StartSpanFromContext creates a root (parentless) Span. -// -// The second return value is a context.Context object built around the -// returned Span. -// -// Example usage: -// -// SomeFunction(ctx context.Context, ...) { -// sp, ctx := opentracing.StartSpanFromContext(ctx, "SomeFunction") -// defer sp.Finish() -// ... -// } -func StartSpanFromContext(ctx context.Context, operationName string, opts ...StartSpanOption) (Span, context.Context) { - return startSpanFromContextWithTracer(ctx, GlobalTracer(), operationName, opts...) -} - -// startSpanFromContextWithTracer is factored out for testing purposes. -func startSpanFromContextWithTracer(ctx context.Context, tracer Tracer, operationName string, opts ...StartSpanOption) (Span, context.Context) { - if parentSpan := SpanFromContext(ctx); parentSpan != nil { - opts = append(opts, ChildOf(parentSpan.Context())) - } - span := tracer.StartSpan(operationName, opts...) - return span, ContextWithSpan(ctx, span) -} |