initial import

core/contextx/unmarshaler.go

@@ -0,0 +1,26 @@
+package contextx
+
+import (
+	"context"
+
+	"zero/core/mapping"
+)
+
+const contextTagKey = "ctx"
+
+var unmarshaler = mapping.NewUnmarshaler(contextTagKey)
+
+type contextValuer struct {
+	context.Context
+}
+
+func (cv contextValuer) Value(key string) (interface{}, bool) {
+	v := cv.Context.Value(key)
+	return v, v != nil
+}
+
+func For(ctx context.Context, v interface{}) error {
+	return unmarshaler.UnmarshalValuer(contextValuer{
+		Context: ctx,
+	}, v)
+}