djsundog/go-bbs
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first pass at using gaio for non-blocking net reads

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This commit is contained in:
Sundog Jones 2021-04-14 08:25:41 -07:00
parent f0a810c330
commit 30989fd935
2 changed files with 169 additions and 86 deletions
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2
go.sum Normal file
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@ -0,0 +1,2 @@
github.com/xtaci/gaio v1.2.9 h1:EuVc7Q2JDzIY2mk5mjtq4K5BgTuO+kj5LXzCwjOK+mo=
github.com/xtaci/gaio v1.2.9/go.mod h1:rJMerwiLCLnKa14YTM/sRggTPrnBZrlCg9U3DnV5VBE=

253
main.go
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@ -1,13 +1,11 @@
package main
import (
"bufio"
"flag"
"io"
"log"
"net"
"os/exec"
"strconv"
"strings"
"sync"
"time"
@ -38,108 +36,190 @@ func main() {
log.Panicln(err)
}
log.Println("new client", conn.RemoteAddr())
// set up io channel for this connection
chIO := make(chan gaio.OpResult)
log.Println("new client: ", conn.RemoteAddr())
// submit the first async write IO request
err = (chIO, conn, welcomeHandler())
err = w.Write(nil, conn, welcomeHandler())
if err != nil {
log.Printf("err sending welcomeHandler: %v\n", err)
log.Printf("err sending welcomeHandler: %v\n", err)
return
}
// hand off channel to menuHandler
menuHandler(chIO, conn, *w)
// menuHandler(w, conn)
wg := new(sync.WaitGroup)
// chan to terminate watcher goroutine when necessary
WatcherControl := make(chan string)
// watcher.WaitIO goroutine
wg.Add(1)
go func(WatcherControl *chan string) {
log.Println("starting menu watchercontrol")
defer wg.Done()
ControlLoop:
for {
log.Println("checking watcher waitio")
select {
case msg := <-*WatcherControl:
if msg == "stop" {
log.Println("closing menu watchercontrol")
break ControlLoop
}
default:
log.Println("menu watchercontrol waiting for IO")
inBuf := make([]byte, 256)
err := w.ReadTimeout(nil, conn, inBuf, time.Now().Add(time.Second))
if err != nil {
log.Printf("err on watcher readtimeout in menu: %v\n", err)
continue
}
results, err := w.WaitIO()
if err != nil {
log.Println("watcher wait err: ", err)
continue
}
log.Println("menu received IO!")
for _, res := range results {
if res.Operation == gaio.OpRead && res.Size > 0 {
log.Println("menu receive: ", strings.TrimSpace(string(res.Buffer[:res.Size-2])))
switch string(strings.TrimSpace(string(res.Buffer[:res.Size-2]))) {
case "welcome":
if err := w.Write(nil, conn, welcomeHandler()); err != nil {
log.Printf("error sending welcomeHandler from cmd `welcome`: %v", err)
}
case "adventure":
// start the door and wait
log.Printf("starting door handler...")
/*
if err := doorHandler(&c); err != nil {
log.Printf("error from cmd `adventure`: %v", err)
}
log.Printf("returning from door")
n, err := c.Write([]byte("\n\n> "))
if err != nil {
log.Printf("error writing to connection: %v", err)
} else {
log.Printf("wrote %d byte prompt to connection", n)
}
*/
case "exit":
/*
if err := exitHandler(); err != nil {
log.Printf("error sending exitHandler from cmd `exit`: %v", err)
}
*/
default:
err := w.Write(nil, conn, []byte("huh?\n\n> "))
if err != nil {
log.Printf("error writing to connection: %v", err)
}
}
} else {
log.Println("watcher confirming write:", string(res.Buffer))
}
}
}
time.Sleep(time.Second)
}
log.Println("watcher controlloop closed!")
}(&WatcherControl)
log.Println("main thread waiting on wg")
wg.Wait()
log.Printf("Goodbye %s!", conn.RemoteAddr())
}
}
func menuHandler(chIO chan gaio.OpResult, c net.Conn, w gaio.Watcher) {
log.Printf("Connection received: %s", c.RemoteAddr())
// watcher.WaitIO goroutine
go func() {
for {
results, err := w.WaitIO()
if err != nil {
log.Println(err)
return
}
for _, res := range results {
chIO <- res
}
}
}()
// send welcome banner
if err := welcomeHandler(&c); err != nil {
log.Printf("error sending welcomeHandler on initial connect: %v", err)
}
func menuHandler(w *gaio.Watcher, c net.Conn) {
wg := new(sync.WaitGroup)
// chan to terminate watcher goroutine when necessary
WatcherControl := make(chan string)
// watcher.WaitIO goroutine
wg.Add(1)
go func() {
go func(WatcherControl *chan string) {
log.Println("starting menu watchercontrol")
defer wg.Done()
scanner := bufio.NewScanner(c)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
line := scanner.Bytes()
log.Printf("Menu received line: %v (%v)", line, string(line))
switch string(line) {
case "welcome":
if err := welcomeHandler(&c); err != nil {
log.Printf("error sending welcomeHandler from cmd `welcome`: %v", err)
}
case "adventure":
// start the door and wait
log.Printf("starting door handler...")
if err := doorHandler(&c); err != nil {
log.Printf("error from cmd `adventure`: %v", err)
}
log.Printf("returning from door")
n, err := c.Write([]byte("\n\n> "))
if err != nil {
log.Printf("error writing to connection: %v", err)
} else {
log.Printf("wrote %d byte prompt to connection", n)
}
case "exit":
if err := exitHandler(c); err != nil {
log.Printf("error sending exitHandler from cmd `exit`: %v", err)
ControlLoop:
for {
log.Println("checking watcher waitio")
select {
case msg := <-*WatcherControl:
if msg == "stop" {
log.Println("closing menu watchercontrol")
break ControlLoop
}
default:
n, err := c.Write([]byte("huh?\n\n> "))
log.Println("menu watchercontrol waiting for IO")
results, err := w.WaitIO()
if err != nil {
log.Printf("error writing to connection: %v", err)
} else {
log.Printf("wrote %d bytes to connection", n)
log.Println(err)
return
}
log.Println("menu received IO!")
for _, res := range results {
if res.Operation == gaio.OpRead {
log.Println("menu receive: ", string(res.Buffer))
switch string(res.Buffer) {
case "":
// noop
case "welcome":
if err := w.Write(nil, c, welcomeHandler()); err != nil {
log.Printf("error sending welcomeHandler from cmd `welcome`: %v", err)
}
case "adventure":
// start the door and wait
log.Printf("starting door handler...")
/*
if err := doorHandler(&c); err != nil {
log.Printf("error from cmd `adventure`: %v", err)
}
log.Printf("returning from door")
n, err := c.Write([]byte("\n\n> "))
if err != nil {
log.Printf("error writing to connection: %v", err)
} else {
log.Printf("wrote %d byte prompt to connection", n)
}
*/
case "exit":
/*
if err := exitHandler(); err != nil {
log.Printf("error sending exitHandler from cmd `exit`: %v", err)
}
*/
default:
err := w.Write(nil, c, []byte("huh?\n\n> "))
if err != nil {
log.Printf("error writing to connection: %v", err)
}
}
} else {
log.Println("watcher confirming write:", string(res.Buffer))
}
}
}
time.Sleep(time.Second)
}
}()
time.Sleep(time.Millisecond)
log.Println("watcher controlloop closed!")
}(&WatcherControl)
log.Println("main thread waiting on wg")
wg.Wait()
log.Printf("Goodbye %s!", c.RemoteAddr())
}
func sendClientText(c net.Conn, s string) error {
n, err := c.Write([]byte(s))
if err != nil { // svr.ListenAndServe()
func sendClientText(w *gaio.Watcher, c net.Conn, s string) error {
err := w.Write(nil, c, []byte(s))
if err != nil {
log.Printf("error writing to connection: %v", err)
return err
} else {
log.Printf("wrote %d bytes to connection", n)
}
return nil
}
func welcomeHandler(c *net.Conn) error {
func welcomeHandler() []byte {
const bannerText = "\x1b[2J\x1b[H\x1b[31m\x1b[J\r\n" + `
_ __ _ ` + "" + `
@ -163,21 +243,21 @@ func welcomeHandler(c *net.Conn) error {
___/ / /_/ /_/ / /_/ / / /_/ (__ ) ` + "" + `
/____/\__/\__,_/\__,_/_/\____/____/ ` + "\x1b[32m\r\n\r\n\r\n" + `
Help is available: type help` + "\r\n\r\n> "
err := sendClientText(*c, bannerText)
if err != nil {
log.Printf("error writing to connection: %v", err)
}
return nil
return []byte(bannerText)
}
/*
func exitHandler(c net.Conn) error {
const exitMessage = "\x1b[2J\x1b[H\x1b[31m\x1b[J\r\n" + `
___| | |
\___ \ _ \ _ \ | | _ \ | | __| __ \ _' | __| _ \ __| _ \\ \ \ / __ \ _ \ | | |
| __/ __/ | | ( | | | \__ \ | | ( | ( __/ ( ( |\ \ \ / | | ( | | |_|
_____/ \___|\___| \__, |\___/ \__,_| ) ____/ .__/ \__,_|\___|\___| \___|\___/ \_/\_/ _.__/ \___/ \__, |_)
____/ / _| ____/
___| | |
\___ \ _ \ _ \ | | _ \ | | __| __ \ _' | __| _ \ __| _ \\ \ \ / __ \ _ \ | | |
| __/ __/ | | ( | | | \__ \ | | ( | ( __/ ( ( |\ \ \ / | | ( | | |_|
_____/ \___|\___| \__, |\___/ \__,_| ) ____/ .__/ \__,_|\___|\___| \___|\___/ \_/\_/ _.__/ \___/ \__, |_)
____/ / _| ____/
`
@ -258,3 +338,4 @@ func doorHandler(c *net.Conn) error {
}
return nil
}
*/