72 lines
1.3 KiB
Go
72 lines
1.3 KiB
Go
package main
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import (
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"net"
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"fmt"
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"os"
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"strings"
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)
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type DatabaseServer struct {
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port uint16
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store map[string]string
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}
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func NewDatabaseServer(port uint16) *DatabaseServer {
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return &DatabaseServer{
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port,
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make(map[string]string),
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}
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}
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func (s *DatabaseServer) Run() {
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addr := fmt.Sprintf("0.0.0.0:%d", s.port)
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pc, err := net.ListenPacket("udp", addr)
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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defer pc.Close()
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buf := make([]byte, 1000)
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fmt.Println("Database server listening for packets")
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for {
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n, addr, err := pc.ReadFrom(buf)
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if err != nil {
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continue
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}
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s.handle(pc, addr, string(buf[:n]))
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}
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}
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func (s *DatabaseServer) handle(pc net.PacketConn, addr net.Addr, req string) {
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var resp string
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fmt.Printf(">> %s\n", req)
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if strings.Contains(req, "=") {
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s.handleInsert(req)
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} else {
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resp = s.handleRetrieve(req)
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}
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if resp != "" {
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fmt.Printf("<< %s\n", resp)
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pc.WriteTo([]byte(resp), addr)
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}
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}
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func (s *DatabaseServer) handleInsert(req string) {
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parts := strings.SplitAfterN(req, "=", 2)
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key := strings.Trim(parts[0], "=")
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value := parts[1]
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if key == "version" {
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return
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}
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s.store[key] = value
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}
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func (s *DatabaseServer) handleRetrieve(req string) string{
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if req == "version" {
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return "version=Deathstar planetary target database v2.9 build 73839"
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}
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value := s.store[req]
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return fmt.Sprintf("%s=%s", req, value)
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}
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