This repository has been archived by the owner on Aug 12, 2021. It is now read-only.
forked from dokku/plugn
/
gateway.go
135 lines (128 loc) · 2.79 KB
/
gateway.go
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package main
import (
"io"
"io/ioutil"
"log"
"os"
"os/signal"
"strings"
"sync"
"github.com/progrium/duplex/poc2/duplex"
"github.com/progrium/plugin-demo/demo/coproc"
)
func runGateway() {
log.Println("starting gateway...")
wg := new(sync.WaitGroup)
host := coproc.StartHost(findPlugins())
wg.Add(1)
go func() {
host.Wait()
wg.Done()
}()
gateway := startGateway(wg, host)
go func() {
handler := make(chan os.Signal, 1)
signal.Notify(handler, os.Interrupt)
first := true
for sig := range handler {
switch sig {
case os.Interrupt:
log.Println("ctrl-c detected")
gateway.Shutdown()
host.Shutdown(!first)
first = false
}
}
}()
wg.Wait()
}
func findPlugins() []string {
var plugins []string
enabled, err := ioutil.ReadDir(PluginPath + "/enabled")
if err != nil {
log.Println(err)
return []string{}
}
for _, file := range enabled {
filepath := PluginPath + "/available/" + file.Name() + "/" + file.Name()
if _, err := os.Stat(filepath); err == nil {
plugins = append(plugins, filepath)
}
}
return plugins
}
func startGateway(wg *sync.WaitGroup, plugins *coproc.Host) *duplex.Peer {
gateway := duplex.NewPeer()
gateway.SetOption(duplex.OptName, "plugn:gateway")
err := gateway.Bind("unix://" + PluginPath + "/gateway.sock")
if err != nil {
panic(err)
}
wg.Add(1)
go func() {
for {
meta, ch := gateway.Accept()
if meta == nil {
break
}
if meta.Service() == "reload" {
log.Println("reload received...")
plugins.RestartWith(findPlugins())
ch.Close()
continue
}
go func() {
for _, peer := range gateway.Peers() {
if !strings.HasPrefix(peer, "plugn") {
hook, err := gateway.Open(peer, meta.Service(), meta.Headers())
if err != nil {
log.Println("unable to trigger", peer)
continue
}
io.Copy(ch, hook)
hook.Close()
}
}
ch.Close()
}()
}
wg.Done()
}()
return gateway
}
func TriggerGateway(args []string) {
gatewaySock := PluginPath + "/gateway.sock"
if _, err := os.Stat(gatewaySock); os.IsNotExist(err) {
return
}
trigger := duplex.NewPeer()
defer trigger.Shutdown()
trigger.SetOption(duplex.OptName, "plugn:trigger")
err := trigger.Connect("unix://" + gatewaySock)
if err != nil {
panic(err)
}
ch, err := trigger.Open("plugn:gateway", args[0], args[1:])
if err != nil {
panic(err)
}
io.Copy(os.Stdout, ch)
ch.Close()
}
func ReloadGateway(args []string) {
gatewaySock := PluginPath + "/gateway.sock"
if _, err := os.Stat(gatewaySock); os.IsNotExist(err) {
return
}
trigger := duplex.NewPeer()
defer trigger.Shutdown()
trigger.SetOption(duplex.OptName, "plugn:reload")
err := trigger.Connect("unix://" + gatewaySock)
if err != nil {
panic(err)
}
_, err = trigger.Open("plugn:gateway", "reload", nil)
if err != nil {
panic(err)
}
}