mirror of https://github.com/knative/docs.git
53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
package context
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import (
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"context"
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"net/url"
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)
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// Opaque key type used to store target
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type targetKeyType struct{}
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var targetKey = targetKeyType{}
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// WithTarget returns back a new context with the given target. Target is intended to be transport dependent.
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// For http transport, `target` should be a full URL and will be injected into the outbound http request.
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func WithTarget(ctx context.Context, target string) context.Context {
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return context.WithValue(ctx, targetKey, target)
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}
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// TargetFrom looks in the given context and returns `target` as a parsed url if found and valid, otherwise nil.
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func TargetFrom(ctx context.Context) *url.URL {
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c := ctx.Value(targetKey)
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if c != nil {
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if s, ok := c.(string); ok && s != "" {
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if target, err := url.Parse(s); err == nil {
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return target
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}
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}
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}
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return nil
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}
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// Opaque key type used to store topic
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type topicKeyType struct{}
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var topicKey = topicKeyType{}
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// WithTopic returns back a new context with the given topic. Topic is intended to be transport dependent.
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// For pubsub transport, `topic` should be a Pub/Sub Topic ID.
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func WithTopic(ctx context.Context, topic string) context.Context {
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return context.WithValue(ctx, topicKey, topic)
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}
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// TopicFrom looks in the given context and returns `topic` as a string if found and valid, otherwise "".
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func TopicFrom(ctx context.Context) string {
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c := ctx.Value(topicKey)
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if c != nil {
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if s, ok := c.(string); ok {
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return s
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}
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}
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return ""
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}
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