init - add project files

vendor/github.com/jonboulle/clockwork/context.go

@@ -0,0 +1,25 @@
+package clockwork
+
+import (
+	"context"
+)
+
+// contextKey is private to this package so we can ensure uniqueness here. This
+// type identifies context values provided by this package.
+type contextKey string
+
+// keyClock provides a clock for injecting during tests. If absent, a real clock should be used.
+var keyClock = contextKey("clock") // clockwork.Clock
+
+// AddToContext creates a derived context that references the specified clock.
+func AddToContext(ctx context.Context, clock Clock) context.Context {
+	return context.WithValue(ctx, keyClock, clock)
+}
+
+// FromContext extracts a clock from the context. If not present, a real clock is returned.
+func FromContext(ctx context.Context) Clock {
+	if clock, ok := ctx.Value(keyClock).(Clock); ok {
+		return clock
+	}
+	return NewRealClock()
+}