86 lines
2.9 KiB
Go
86 lines
2.9 KiB
Go
package node
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import (
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"strconv"
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)
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// if protocolError, ok := err.(*ProtocolError); ok { log(protocolError.Code, protocolError.Message) }
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type ProtocolError struct {
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Code int
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Message string
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}
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func (protocolError *ProtocolError) Error() string {
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return "remote error (" + strconv.Itoa(protocolError.Code) + "): " + protocolError.Message
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}
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// handler := &ResponseHandler{}
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// if err := handler.ValidateResponse(response, MsgPong); err != nil { return 0, err }
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type ResponseHandler struct{}
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// if err := handler.ValidateResponse(response, MsgPong); err != nil { return 0, err }
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func (handler *ResponseHandler) ValidateResponse(response *Message, expectedType MessageType) error {
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if response == nil {
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return &ProtocolError{Code: ErrCodeUnknown, Message: "nil response"}
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}
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// Check for error response
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if response.Type == MsgError {
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var errPayload ErrorPayload
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if err := response.ParsePayload(&errPayload); err != nil {
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return &ProtocolError{Code: ErrCodeUnknown, Message: "unable to parse error response"}
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}
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return &ProtocolError{Code: errPayload.Code, Message: errPayload.Message}
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}
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// Check expected type
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if response.Type != expectedType {
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return &ProtocolError{Code: ErrCodeInvalidMessage, Message: "unexpected response type: expected " + string(expectedType) + ", got " + string(response.Type)}
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}
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return nil
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}
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// var stats StatsPayload
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// if err := handler.ParseResponse(response, MsgStats, &stats); err != nil { return nil, err }
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func (handler *ResponseHandler) ParseResponse(response *Message, expectedType MessageType, target interface{}) error {
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if err := handler.ValidateResponse(response, expectedType); err != nil {
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return err
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}
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if target != nil {
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if err := response.ParsePayload(target); err != nil {
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return &ProtocolError{Code: ErrCodeInvalidMessage, Message: "failed to parse " + string(expectedType) + " payload: " + err.Error()}
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}
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}
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return nil
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}
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// if err := ValidateResponse(response, MsgPong); err != nil { return 0, err } // delegates to DefaultResponseHandler
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var DefaultResponseHandler = &ResponseHandler{}
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// if err := ValidateResponse(response, MsgPong); err != nil { return 0, err }
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func ValidateResponse(response *Message, expectedType MessageType) error {
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return DefaultResponseHandler.ValidateResponse(response, expectedType)
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}
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// var stats StatsPayload
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// if err := ParseResponse(response, MsgStats, &stats); err != nil { return nil, err }
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func ParseResponse(response *Message, expectedType MessageType, target interface{}) error {
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return DefaultResponseHandler.ParseResponse(response, expectedType, target)
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}
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// if node.IsProtocolError(err) { log("remote code:", node.GetProtocolErrorCode(err)) }
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func IsProtocolError(err error) bool {
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_, ok := err.(*ProtocolError)
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return ok
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}
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// code := GetProtocolErrorCode(err) // 0 when err is not a ProtocolError
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func GetProtocolErrorCode(err error) int {
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if protocolError, ok := err.(*ProtocolError); ok {
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return protocolError.Code
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}
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return 0
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}
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