1 files changed, 72 insertions, 0 deletions
diff --git a/eth/error.go b/eth/error.go
new file mode 100644
index 000000000..9c4a68481
--- /dev/null
+++ b/eth/error.go
@@ -0,0 +1,72 @@
+package eth
+
+import (
+	"fmt"
+)
+
+const (
+	ErrMsgTooLarge = iota
+	ErrDecode
+	ErrInvalidMsgCode
+	ErrProtocolVersionMismatch
+	ErrNetworkIdMismatch
+	ErrGenesisBlockMismatch
+	ErrNoStatusMsg
+	ErrExtraStatusMsg
+	ErrInvalidBlock
+	ErrInvalidPoW
+	ErrUnrequestedBlock
+	ErrInsufficientChainInfo
+)
+
+var errorToString = map[int]string{
+	ErrMsgTooLarge:             "Message too long",
+	ErrDecode:                  "Invalid message",
+	ErrInvalidMsgCode:          "Invalid message code",
+	ErrProtocolVersionMismatch: "Protocol version mismatch",
+	ErrNetworkIdMismatch:       "NetworkId mismatch",
+	ErrGenesisBlockMismatch:    "Genesis block mismatch",
+	ErrNoStatusMsg:             "No status message",
+	ErrExtraStatusMsg:          "Extra status message",
+	ErrInvalidBlock:            "Invalid block",
+	ErrInvalidPoW:              "Invalid PoW",
+	ErrUnrequestedBlock:        "Unrequested block",
+	ErrInsufficientChainInfo:   "Insufficient chain info",
+}
+
+type protocolError struct {
+	Code    int
+	fatal   bool
+	message string
+	format  string
+	params  []interface{}
+	// size    int
+}
+
+func newProtocolError(code int, format string, params ...interface{}) *protocolError {
+	return &protocolError{Code: code, format: format, params: params}
+}
+
+func ProtocolError(code int, format string, params ...interface{}) (err *protocolError) {
+	err = newProtocolError(code, format, params...)
+	// report(err)
+	return
+}
+
+func (self protocolError) Error() (message string) {
+	if len(message) == 0 {
+		var ok bool
+		self.message, ok = errorToString[self.Code]
+		if !ok {
+			panic("invalid error code")
+		}
+		if self.format != "" {
+			self.message += ": " + fmt.Sprintf(self.format, self.params...)
+		}
+	}
+	return self.message
+}
+
+func (self *protocolError) Fatal() bool {
+	return self.fatal
+}