rpc: also move Error to errors.go

Author: fjl

rpc/errors.go

@@ -33,6 +33,18 @@ func (err HTTPError) Error() string {
 	return fmt.Sprintf("%v: %s", err.Status, err.Body)
 }
 
+// Error wraps RPC errors, which contain an error code in addition to the message.
+type Error interface {
+	Error() string  // returns the message
+	ErrorCode() int // returns the code
+}
+
+// A DataError contains some data in addition to the error message.
+type DataError interface {
+	Error() string          // returns the message
+	ErrorData() interface{} // returns the error data
+}
+
 // Error types defined below are the built-in JSON-RPC errors.
 
 var (

rpc/types.go

@@ -35,18 +35,6 @@ type API struct {
 	Public    bool        // indication if the methods must be considered safe for public use
 }
 
-// Error wraps RPC errors, which contain an error code in addition to the message.
-type Error interface {
-	Error() string  // returns the message
-	ErrorCode() int // returns the code
-}
-
-// A DataError contains some data in addition to the error message.
-type DataError interface {
-	Error() string          // returns the message
-	ErrorData() interface{} // returns the error data
-}
-
 // ServerCodec implements reading, parsing and writing RPC messages for the server side of
 // a RPC session. Implementations must be go-routine safe since the codec can be called in
 // multiple go-routines concurrently.