From 7141f972700ed454438d8539dd0bec79c0b61cf4 Mon Sep 17 00:00:00 2001 From: Sebastian Jug Date: Tue, 16 Oct 2018 16:30:53 -0400 Subject: OpenTracing support added to start, stop, run, create, pull, and ps Drop context.Context field from cli.Context Signed-off-by: Sebastian Jug --- .../opentracing/opentracing-go/gocontext.go | 54 ++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 vendor/github.com/opentracing/opentracing-go/gocontext.go (limited to 'vendor/github.com/opentracing/opentracing-go/gocontext.go') diff --git a/vendor/github.com/opentracing/opentracing-go/gocontext.go b/vendor/github.com/opentracing/opentracing-go/gocontext.go new file mode 100644 index 000000000..05a62e70b --- /dev/null +++ b/vendor/github.com/opentracing/opentracing-go/gocontext.go @@ -0,0 +1,54 @@ +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) +} -- cgit v1.2.3-54-g00ecf