Added Error message type to wire protocol

lnwire/error_generic.go

@@ -0,0 +1,74 @@
+package lnwire
+
+import (
+	"fmt"
+	"io"
+)
+
+//Multiple Clearing Requests are possible by putting this inside an array of
+//clearing requests
+type ErrorGeneric struct {
+	//We can use a different data type for this if necessary...
+	ChannelID uint64
+	//Some kind of message
+	//Max length 8192
+	Problem string
+}
+
+func (c *ErrorGeneric) Decode(r io.Reader, pver uint32) error {
+	//ChannelID(8)
+	//Problem
+	err := readElements(r,
+		&c.ChannelID,
+		&c.Problem,
+	)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+//Creates a new ErrorGeneric
+func NewErrorGeneric() *ErrorGeneric {
+	return &ErrorGeneric{}
+}
+
+//Serializes the item from the ErrorGeneric struct
+//Writes the data to w
+func (c *ErrorGeneric) Encode(w io.Writer, pver uint32) error {
+	err := writeElements(w,
+		c.ChannelID,
+		c.Problem,
+	)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *ErrorGeneric) Command() uint32 {
+	return CmdErrorGeneric
+}
+
+func (c *ErrorGeneric) MaxPayloadLength(uint32) uint32 {
+	//8+8192
+	return 8208
+}
+
+//Makes sure the struct data is valid (e.g. no negatives or invalid pkscripts)
+func (c *ErrorGeneric) Validate() error {
+	if len(c.Problem) > 8192 {
+		return fmt.Errorf("Problem string length too long")
+	}
+	//We're good!
+	return nil
+}
+
+func (c *ErrorGeneric) String() string {
+	return fmt.Sprintf("\n--- Begin ErrorGeneric ---\n") +
+		fmt.Sprintf("ChannelID:\t%d\n", c.ChannelID) +
+		fmt.Sprintf("Problem:\t%s\n", c.Problem) +
+		fmt.Sprintf("--- End ErrorGeneric ---\n")
+}