9c6661eca2
This commit introduces a new tracing library, that replaces golang.org/x/net/trace, and supports (amongts other thing) nested traces. This is a minimal change, future patches will make use of the new functionality.
41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
package nettrace
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import "context"
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type ctxKeyT string
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const ctxKey ctxKeyT = "blitiri.com.ar/go/srv/nettrace"
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// NewContext returns a new context with the given trace attached.
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func NewContext(ctx context.Context, tr Trace) context.Context {
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return context.WithValue(ctx, ctxKey, tr)
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}
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// FromContext returns the trace attached to the given context (if any).
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func FromContext(ctx context.Context) (Trace, bool) {
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tr, ok := ctx.Value(ctxKey).(Trace)
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return tr, ok
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}
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// FromContextOrNew returns the trace attached to the given context, or a new
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// trace if there is none.
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func FromContextOrNew(ctx context.Context, family, title string) (Trace, context.Context) {
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tr, ok := FromContext(ctx)
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if ok {
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return tr, ctx
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}
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tr = New(family, title)
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return tr, NewContext(ctx, tr)
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}
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// ChildFromContext returns a new trace that is a child of the one attached to
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// the context (if any).
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func ChildFromContext(ctx context.Context, family, title string) Trace {
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parent, ok := FromContext(ctx)
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if ok {
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return parent.NewChild(family, title)
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}
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return New(family, title)
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}
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