/
bridge.go
115 lines (107 loc) · 2.25 KB
/
bridge.go
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/*
I think that the bridge is meant for network connections; at least that is what the "packet" and encoding indicates
to me. Probably not relevant for my use case
*/
package nes
import (
"encoding/gob"
"fmt"
"io"
"net"
"os"
)
func loop(conn net.Conn, incoming chan<- Packet, outgoing <-chan Packet) (err error) {
dec := gob.NewDecoder(conn)
enc := gob.NewEncoder(conn)
go func(c <-chan Packet, conn net.Conn, enc *gob.Encoder) {
for {
pkt := <-c
err := enc.Encode(&pkt)
if err != nil {
fmt.Fprintf(os.Stderr, "Encode err: %s\n", err)
if err == io.EOF {
break
}
}
}
conn.Close()
}(outgoing, conn, enc)
var pkt Packet
for {
err = dec.Decode(&pkt)
if err != nil {
fmt.Fprintf(os.Stderr, "Decode err: %s\n", err)
if err == io.EOF {
break
}
} else {
incoming <- pkt
}
}
conn.Close()
return
}
type Bridge struct {
nes *NES
incoming chan Packet
outgoing chan Packet
addr string
active bool
}
func newBridge(nes *NES, addr string) (bridge *Bridge) {
cin := make(chan Packet, 16)
cout := make(chan Packet, 16)
bridge = &Bridge{
nes: nes,
incoming: cin,
outgoing: cout,
addr: addr,
}
return
}
func (bridge *Bridge) runAsMaster() error {
fmt.Println("run bridge as master")
if len(bridge.addr) == 0 {
return nil
}
ln, err := net.Listen("tcp", bridge.addr)
if err != nil {
fmt.Fprintf(os.Stderr, "Listen error: %s\n", err)
return err
}
for {
conn, err := ln.Accept()
if err != nil {
fmt.Fprintf(os.Stderr, "Accept error: %s\n", err)
// Serve next conn
continue
}
lock := <-bridge.nes.lock
bridge.active = true
ev, err := bridge.nes.getLoadStateEvent()
bridge.outgoing <- Packet{
Tick: bridge.nes.Tick,
Ev: ev,
}
bridge.nes.lock <- lock
if err == nil {
if err := loop(conn, bridge.incoming, bridge.outgoing); err != nil {
fmt.Fprintf(os.Stderr, "Serving slave error: %s\n", err)
}
}
bridge.active = false
}
return err
}
func (bridge *Bridge) runAsSlave() error {
if len(bridge.addr) == 0 {
return nil
}
fmt.Println("run bridge as slave")
conn, err := net.Dial("tcp", bridge.addr)
if err != nil {
fmt.Fprintf(os.Stderr, "Connecting error: %s\n", err)
return err
}
return loop(conn, bridge.incoming, bridge.outgoing)
}