/
webserver.go
162 lines (143 loc) · 4.46 KB
/
webserver.go
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package main
import (
"fmt"
"net/http"
"os"
"os/exec"
"os/signal"
"path"
"strings"
"syscall"
"text/template"
"github.com/nyxtom/gracefulhttp"
"github.com/nyxtom/workclient"
)
// WebServer is a simple work client enabled http server
type WebServer struct {
workclient.WorkClient
cmdArgs []string
closed bool
httpServer *gracefulhttp.Server
}
// NewWebServer returns a work client enabled http server
func NewWebServer(config workclient.Config, fd int, cmdArgs []string) *WebServer {
server := new(WebServer)
server.cmdArgs = cmdArgs
server.httpServer = gracefulhttp.NewServer(config.WebAddr, 0)
server.httpServer.ReadTimeout = config.ReadTimeout
server.httpServer.WriteTimeout = config.WriteTimeout
server.httpServer.MaxHeaderBytes = config.MaxHeaderBytes
server.httpServer.FileDescriptor = fd
server.Configure(config, server.listen, server.stopListening)
return server
}
// ServeWeb will create a web server, attach signal flags and run the worker
func ServeWeb(config workclient.Config, fd int, cmdArgs []string) {
server := NewWebServer(config, fd, cmdArgs)
server.AttachSignals()
server.Run()
}
// RestartGraceful will perform a no-downtime restart by passing off the socket to the forked process
func (server *WebServer) RestartGraceful() {
server.LogInfo("initiated graceful restart for web server")
fd := server.httpServer.Fd()
args := []string{}
for _, k := range server.cmdArgs[1:] {
if !strings.Contains(k, "--fd=") {
args = append(args, k)
}
}
args = append(args, fmt.Sprintf("--fd=%d", fd))
cmd := exec.Command(server.cmdArgs[0], args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Start()
if err != nil {
server.LogErr(err)
}
}
// AttachSignals will create a channel to OS.Signal to listen for any signup events..etc
func (server *WebServer) AttachSignals() {
sc := make(chan os.Signal)
signal.Notify(sc,
syscall.SIGHUP,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT,
syscall.SIGKILL,
os.Interrupt)
go func() {
for {
signal := <-sc
if signal == syscall.SIGHUP {
server.RestartGraceful()
} else {
close(sc)
server.Close()
break
}
}
}()
}
func (server *WebServer) listen() {
if server.httpServer.FileDescriptor == 0 {
server.LogInfoF("listening on %s", server.httpServer.Addr)
} else {
server.LogInfoF("listening on existing file descriptor %d, %s", server.httpServer.FileDescriptor, server.httpServer.Addr)
}
handleFunc("/", server.logReq, server.index)
//handleFunc("/restart", server.logReq, server.restart)
//handleFunc("/shutdown", server.logReq, server.shutdown)
http.Handle("/css/", http.StripPrefix("/css/", http.FileServer(http.Dir("./app/css"))))
http.Handle("/imgs/", http.StripPrefix("/imgs/", http.FileServer(http.Dir("./app/imgs"))))
http.Handle("/js/", http.StripPrefix("/js/", http.FileServer(http.Dir("./app/js"))))
items := []string{"apple-touch-icon.png", "crossdomain.xml", "favicon.ico", "humans.txt", "robots.txt", "tile-wide.png", "tile.png", "browserconfig.xml"}
for _, k := range items {
handleFunc("/"+k, server.logReq, func(w http.ResponseWriter, req *http.Request) {
http.ServeFile(w, req, "./"+k)
})
}
err := server.httpServer.ListenAndServe()
if err != nil {
server.LogErr(err)
server.Close()
}
}
func (server *WebServer) stopListening() {
server.httpServer.Close()
}
func (server *WebServer) logReq(w http.ResponseWriter, req *http.Request) {
server.LogInfoF("%v %v from %v", req.Method, req.URL, req.RemoteAddr)
}
func (server *WebServer) index(w http.ResponseWriter, req *http.Request) {
lp := path.Join("app", "index.html")
server.handleTemplate(w, req, lp)
}
func (server *WebServer) handleTemplate(w http.ResponseWriter, req *http.Request, lp string) {
tmpl, err := template.ParseFiles(lp)
if err != nil {
server.LogErr(err)
http.Error(w, http.StatusText(500), 500)
return
}
if err := tmpl.Execute(w, nil); err != nil {
server.LogErr(err)
http.Error(w, http.StatusText(500), 500)
}
}
/*
func (server *WebServer) restart(w http.ResponseWriter, req *http.Request) {
server.RestartGraceful()
http.Redirect(w, req, "/", http.StatusFound)
}
func (server *WebServer) shutdown(w http.ResponseWriter, req *http.Request) {
server.Close()
}*/
// handleFunc takes a prefix and a list of http handlers to execute them as an in-order stack
func handleFunc(path string, fns ...func(http.ResponseWriter, *http.Request)) {
http.HandleFunc(path, func(w http.ResponseWriter, req *http.Request) {
for _, fn := range fns {
fn(w, req)
}
})
}