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feat: add a function to tell if a context subscribes to query events

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This can save us some work if the caller doesn't actually care about these events.
This commit is contained in:
Steven Allen 2020-04-29 13:11:46 -07:00
parent a14197ce56
commit 5d9ec0280b
1 changed files with 7 additions and 0 deletions
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7
routing/query.go
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@ -102,3 +102,10 @@ func PublishQueryEvent(ctx context.Context, ev *QueryEvent) {
ech := ich.(*eventChannel)
ech.send(ctx, ev)
}
// SubscribesToQueryEvents returns true if the context subscribes to query
// events. If this function returns falls, calling `PublishQueryEvent` on the
// context will be a no-op.
func SubscribesToQueryEvents(ctx context.Context) bool {
return ctx.Value(routingQueryKey{}) != nil
}