impl config State and config Interval

config/state.go

@@ -0,0 +1,27 @@
+package config
+
+import (
+	"encoding/json"
+	"errors"
+)
+
+type State string
+
+var States = map[int]State{
+	27006: "NC",
+	84058: "UT",
+}
+
+func (state *State) UnmarshalJSON(b []byte) error {
+	var s string
+	if err := json.Unmarshal(b, &s); err != nil {
+		return err
+	}
+	for k := range States {
+		if string(States[k]) == s {
+			*state = States[k]
+			return nil
+		}
+	}
+	return errors.New("unknown state " + s)
+}