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package main
import (
"errors"
"github.com/Shopify/go-lua"
"github.com/anon55555/mt"
"net"
)
type clientState uint8
const (
csNew clientState = iota
csConnected
csDisconnected
)
type Handler interface {
create(client *Client)
push(l *lua.State)
canConnect() (bool, string)
connect()
handle(pkt *mt.Pkt, l *lua.State, idx int)
}
type Client struct {
address string
state clientState
handlers map[string]Handler
conn mt.Peer
queue chan *mt.Pkt
}
func getClient(l *lua.State) *Client {
return lua.CheckUserData(l, 1, "hydra.client").(*Client)
}
func l_client(l *lua.State) int {
client := &Client{
address: lua.CheckString(l, 1),
state: csNew,
handlers: map[string]Handler{},
}
l.PushUserData(client)
if lua.NewMetaTable(l, "hydra.client") {
lua.NewLibrary(l, []lua.RegistryFunction{
{Name: "address", Function: l_client_address},
{Name: "state", Function: l_client_state},
{Name: "handler", Function: l_client_handler},
{Name: "connect", Function: l_client_connect},
{Name: "disconnect", Function: l_client_disconnect},
})
l.SetField(-2, "__index")
}
l.SetMetaTable(-2)
return 1
}
func l_client_address(l *lua.State) int {
client := getClient(l)
l.PushString(client.address)
return 1
}
func l_client_state(l *lua.State) int {
client := getClient(l)
switch client.state {
case csNew:
l.PushString("new")
case csConnected:
l.PushString("connected")
case csDisconnected:
l.PushString("disconnected")
}
return 1
}
func l_client_handler(l *lua.State) int {
client := getClient(l)
name := lua.CheckString(l, 2)
handler, exists := client.handlers[name]
if !exists {
switch name {
case "callbacks":
handler = &Callbacks{}
case "auth":
handler = &Auth{}
default:
return 0
}
client.handlers[name] = handler
handler.create(client)
}
handler.push(l)
return 1
}
func l_client_connect(l *lua.State) int {
client := getClient(l)
if client.state != csNew {
l.PushBoolean(false)
l.PushString("invalid state")
return 2
}
for _, handler := range client.handlers {
ok, err := handler.canConnect()
if !ok {
l.PushBoolean(false)
l.PushString(err)
return 2
}
}
addr, err := net.ResolveUDPAddr("udp", client.address)
if err != nil {
l.PushBoolean(false)
l.PushString(err.Error())
return 2
}
conn, err := net.DialUDP("udp", nil, addr)
if err != nil {
l.PushBoolean(false)
l.PushString(err.Error())
return 2
}
client.state = csConnected
client.conn = mt.Connect(conn)
client.queue = make(chan *mt.Pkt, 1024)
for _, handler := range client.handlers {
handler.connect()
}
go func() {
for {
pkt, err := client.conn.Recv()
if err == nil {
client.queue <- &pkt
} else if errors.Is(err, net.ErrClosed) {
close(client.queue)
return
}
}
}()
l.PushBoolean(true)
return 1
}
func l_client_disconnect(l *lua.State) int {
client := getClient(l)
if client.state == csConnected {
client.conn.Close()
}
return 0
}
|
