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package grpc_ctxtags
import "context"
type ctxMarker struct{}
var (
// ctxMarkerKey is the Context value marker used by *all* logging middleware.
// The logging middleware object must interf
ctxMarkerKey = &ctxMarker{}
)
// Tags is the struct used for storing request tags between Context calls.
// This object is *not* thread safe, and should be handled only in the context of the request.
type Tags struct {
values map[string]interface{}
}
// Set sets the given key in the metadata tags.
func (t *Tags) Set(key string, value interface{}) *Tags {
t.values[key] = value
return t
}
// Has checks if the given key exists.
func (t *Tags) Has(key string) bool {
_, ok := t.values[key]
return ok
}
// Values returns a map of key to values.
// Do not modify the underlying map, please use Set instead.
func (t *Tags) Values() map[string]interface{} {
return t.values
}
// Extracts returns a pre-existing Tags object in the Context.
// If the context wasn't set in a tag interceptor, a no-op Tag storage is returned that will *not* be propagated in context.
func Extract(ctx context.Context) *Tags {
t, ok := ctx.Value(ctxMarkerKey).(*Tags)
if !ok {
return &Tags{values: make(map[string]interface{})}
}
return t
}
func setInContext(ctx context.Context, tags *Tags) context.Context {
return context.WithValue(ctx, ctxMarkerKey, tags)
}
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