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package main
import (
"bufio"
"errors"
"flag"
"fmt"
"io"
"log"
"net/http"
"os"
"runtime"
"strings"
"time"
)
func main() {
lAddr := flag.String("l", "127.0.0.1:3000", "Address HTTP-server will listen to")
wrksNum := flag.Int("n", runtime.NumCPU(), "Number of HTTP-workers to start")
flag.Parse()
if flag.NArg() != 1 {
printUsage()
}
luaExe := flag.Arg(0)
mustExist(luaExe)
httpClient := &http.Client{}
// queue for http messages for workers to handle
msgs := make(chan interface{}, 4096)
mux := http.NewServeMux()
wrks := []*Worker{}
// track routes for mux to avoid registering the same route twice
routes := make(map[string]bool)
// define luna.router module
routeModule := make(map[string]any)
routeModule["route"] = func (l *Lua) int {
var route string
var fn LuaRef
err := l.Scan(&route, &fn)
if err != nil {
fmt.Println("error:", err)
// FIXME: handle
return 0
}
// find corresponding worker for the lua context
var wrk *Worker
for _, wrk = range wrks {
if wrk.HasSameLua(l) {
wrk.SetRoute(route, fn)
break
}
}
if wrk == nil {
return 0
}
// check if route is already registered. otherwise
// mux.HandleFunc will panic
_, ok := routes[route]
if ok {
return 0
}
routes[route] = true
mux.HandleFunc(
route,
func (w http.ResponseWriter, r *http.Request) {
start := time.Now()
resCh := HandleHTTPRequest(msgs, route, r)
res := <- resCh
for k, h := range res.Headers {
w.Header().Set(k, h)
}
w.WriteHeader(int(res.Code))
fmt.Fprint(w, string(res.Body))
log.Printf(
"%s %s (%s) -> %d\n",
r.Method,
r.URL.Path,
time.Now().Sub(start),
res.Code,
)
},
)
return 0
}
// define luna.http module
httpModule := make(map[string]any)
httpModule["request"] = func (l *Lua) int {
var method, url, body string
headers := make(map[string]string)
err := l.Scan(&method, &url, &headers, &body)
if err != nil {
// FIXME: handle
fmt.Println("error:", err)
return 0
}
req, err := http.NewRequest(method, url, strings.NewReader(body))
if err != nil {
// FIXME: return error
return 0
}
for k, v := range headers {
req.Header.Add(k, v)
}
resp, err := httpClient.Do(req)
if err != nil {
// FIXME: return error
return 0
}
defer resp.Body.Close()
respBody, err := io.ReadAll(resp.Body)
if err != nil {
// FIXME: return error
return 0
}
respHeaders := make(map[string]any)
for k := range resp.Header {
respHeaders[k] = resp.Header.Get(k)
}
l.PushNumber(resp.StatusCode)
l.PushObject(respHeaders)
l.PushString(string(respBody))
return 3
}
module := make(map[string]any)
module["router"] = routeModule
module["http"] = httpModule
// start workers
for i := 0; i < *wrksNum; i++ {
wrk := NewWorker()
wrks = append(wrks, wrk)
go func () {
err := wrk.Start(luaExe, module)
if err != nil {
log.Fatal(err)
}
wrks = append(wrks, wrk)
log.Printf("worker %d started\n", i)
wrk.Listen(msgs)
}()
defer wrk.Stop()
}
// listen for evals from stdio
go func () {
reader := bufio.NewReader(os.Stdin)
for {
code, _ := reader.ReadString('\n')
if len(code) == 0 {
continue
}
for _, wrk := range wrks {
if err := wrk.Eval(code); err != nil {
log.Printf("error: %s\n", err)
break
}
}
}
}()
log.Printf("luna is running at %s...", *lAddr)
log.Fatal(http.ListenAndServe(*lAddr, mux))
}
func printUsage() {
fmt.Printf("usage: %s [luafile]\n", os.Args[0])
flag.PrintDefaults()
os.Exit(2)
}
func mustExist(file string) {
if _, err := os.Stat(file); errors.Is(err, os.ErrNotExist) {
fmt.Printf(`file "%s" does not exist\n`, file)
os.Exit(1)
}
}
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