mirror of
https://github.com/status-im/status-go.git
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eeca435064
Update vendor Integrate rendezvous into status node Add a test with failover using rendezvous Use multiple servers in client Use discovery V5 by default and test that node can be started with rendezvous discovet Fix linter Update rendezvous client to one with instrumented stream Address feedback Fix test with updated topic limits Apply several suggestions Change log to debug for request errors because we continue execution Remove web3js after rebase Update rendezvous package
58 lines
2.0 KiB
Go
58 lines
2.0 KiB
Go
package opentracing
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import "golang.org/x/net/context"
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type contextKey struct{}
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var activeSpanKey = contextKey{}
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// ContextWithSpan returns a new `context.Context` that holds a reference to
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// `span`'s SpanContext.
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func ContextWithSpan(ctx context.Context, span Span) context.Context {
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return context.WithValue(ctx, activeSpanKey, span)
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}
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// SpanFromContext returns the `Span` previously associated with `ctx`, or
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// `nil` if no such `Span` could be found.
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//
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// NOTE: context.Context != SpanContext: the former is Go's intra-process
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// context propagation mechanism, and the latter houses OpenTracing's per-Span
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// identity and baggage information.
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func SpanFromContext(ctx context.Context) Span {
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val := ctx.Value(activeSpanKey)
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if sp, ok := val.(Span); ok {
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return sp
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}
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return nil
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}
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// StartSpanFromContext starts and returns a Span with `operationName`, using
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// any Span found within `ctx` as a ChildOfRef. If no such parent could be
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// found, StartSpanFromContext creates a root (parentless) Span.
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//
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// The second return value is a context.Context object built around the
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// returned Span.
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//
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// Example usage:
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//
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// SomeFunction(ctx context.Context, ...) {
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// sp, ctx := opentracing.StartSpanFromContext(ctx, "SomeFunction")
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// defer sp.Finish()
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// ...
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// }
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func StartSpanFromContext(ctx context.Context, operationName string, opts ...StartSpanOption) (Span, context.Context) {
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return startSpanFromContextWithTracer(ctx, GlobalTracer(), operationName, opts...)
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}
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// startSpanFromContextWithTracer is factored out for testing purposes.
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func startSpanFromContextWithTracer(ctx context.Context, tracer Tracer, operationName string, opts ...StartSpanOption) (Span, context.Context) {
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var span Span
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if parentSpan := SpanFromContext(ctx); parentSpan != nil {
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opts = append(opts, ChildOf(parentSpan.Context()))
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span = tracer.StartSpan(operationName, opts...)
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} else {
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span = tracer.StartSpan(operationName, opts...)
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}
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return span, ContextWithSpan(ctx, span)
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}
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