Emcee

package jsonrpc import ( "encoding/json" "fmt" ) // ID represents a JSON-RPC ID which must be either a string or number type ID struct { value interface{} } // NewID creates a JSON-RPC ID from a string or number func NewID(id interface{}) (ID, error) { switch v := id.(type) { case ID: return v, nil case string: return ID{value: v}, nil case int, int32, int64, float32, float64: return ID{value: v}, nil case nil: return ID{}, fmt.Errorf("id cannot be null") default: return ID{}, fmt.Errorf("id must be string or number, got %T", id) } } func (id ID) Value() interface{} { return id.value } func (id ID) IsNil() bool { return id.value == nil } // Equal compares two IDs for equality func (id ID) Equal(other interface{}) bool { // If comparing with raw value switch v := other.(type) { case string, int, int32, int64, float32, float64: return id.value == v case ID: return id.value == v.value default: return false } } var _ fmt.GoStringer = ID{} // GoString implements fmt.GoStringer func (id ID) GoString() string { switch v := id.value.(type) { case string: return fmt.Sprintf("%q", v) case float64, float32: return fmt.Sprintf("%g", v) case int, int32, int64: return fmt.Sprintf("%d", v) case nil: return "nil" default: return fmt.Sprintf("%v", v) } } var _ json.Marshaler = ID{} func (id ID) MarshalJSON() ([]byte, error) { switch id.value { case nil: return json.Marshal(0) default: return json.Marshal(id.value) } } var _ json.Unmarshaler = &ID{} // UnmarshalJSON implements json.Unmarshaler func (id *ID) UnmarshalJSON(data []byte) error { var raw interface{} if err := json.Unmarshal(data, &raw); err != nil { return err } switch v := raw.(type) { case string: id.value = v return nil case float64: // JSON numbers are decoded as float64 id.value = int(v) return nil case nil: return fmt.Errorf("id cannot be null") default: return fmt.Errorf("id must be string or number, got %T", raw) } }