initial commit

protocol/ping.go

@@ -0,0 +1,39 @@
+package protocol
+
+import (
+	"fmt"
+	"strings"
+)
+
+type PingPDU struct {
+	From      string `validate:"required,alphanum,max=7"`
+	To        string `validate:"required,alphanum,max=7"`
+	Timestamp string `validate:"required,max=32"`
+}
+
+func (p *PingPDU) Serialize() string {
+	return fmt.Sprintf("$PI%s:%s:%s%s", p.From, p.To, p.Timestamp, PacketDelimeter)
+}
+
+func ParsePingPDU(rawPacket string) (*PingPDU, error) {
+	rawPacket = strings.TrimSuffix(rawPacket, PacketDelimeter)
+	rawPacket = strings.TrimPrefix(rawPacket, "$PI")
+	fields := strings.Split(rawPacket, Delimeter)
+
+	if len(fields) != 3 {
+		return nil, NewGenericFSDError(SyntaxError)
+	}
+
+	pdu := PingPDU{
+		From:      fields[0],
+		To:        fields[1],
+		Timestamp: fields[2],
+	}
+
+	err := V.Struct(pdu)
+	if err != nil {
+		return nil, NewGenericFSDError(SyntaxError)
+	}
+
+	return &pdu, nil
+}