FromContext/NewContext methods

client/context.go

@@ -0,0 +1,16 @@
+package client
+
+import (
+	"golang.org/x/net/context"
+)
+
+type clientKey struct{}
+
+func FromContext(ctx context.Context) (Client, bool) {
+	c, ok := ctx.Value(clientKey{}).(Client)
+	return c, ok
+}
+
+func NewContext(ctx context.Context, c Client) context.Context {
+	return context.WithValue(ctx, clientKey{}, c)
+}