forked from cpuguy83/docker-grand-ambassador
/
grand_ambassador.go
119 lines (106 loc) · 2.92 KB
/
grand_ambassador.go
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package main
import (
"flag"
"fmt"
"github.com/cpuguy83/docker-grand-ambassador/docker"
"github.com/cpuguy83/docker-grand-ambassador/proxy"
"github.com/cpuguy83/docker-grand-ambassador/utils"
"log"
"net"
"os"
)
var (
dockerClient docker.Docker
)
func main() {
var (
socket = flag.String("sock", "/var/run/docker.sock", "Path to docker socket")
containerName = flag.String("name", "", "Name/ID of container to ambassadorize")
err error
)
flag.Parse()
if *containerName == "" {
fmt.Println("Missing required arguments")
os.Exit(1)
}
dockerClient, err := docker.NewClient(*socket)
if err != nil {
log.Printf("Could not connect to Docker: %s", err)
os.Exit(1)
}
container, err := dockerClient.FetchContainer(*containerName)
if err != nil {
log.Printf("%v", err)
os.Exit(1)
}
proxyChan := makeProxyChan(container)
log.Printf("Initializing proxy")
if err = proxyContainer(container, proxyChan); err != nil {
log.Printf("%v", err)
os.Exit(1)
}
events := dockerClient.GetEvents()
go handleEvents(container, events, dockerClient, proxyChan)
wait := make(chan bool)
<-wait
}
func handleEvents(container *docker.Container, eventChan chan *docker.Event, dockerClient docker.Docker, proxyChan chan net.Listener) error {
var err error
log.Printf("Handling Events for: %v: %v", container.Id, container.Name)
for event := range eventChan {
if container.Id == event.ContainerId {
log.Printf("Received event: %v", event)
switch event.Status {
case "die", "stop", "kill":
log.Printf("Handling event for stop/die/kill")
for srv := range proxyChan {
srv.Close()
}
case "start", "restart":
log.Printf("Handling event start/restart")
c, err := dockerClient.FetchContainer(event.ContainerId)
if err != nil {
log.Printf("%v", err)
os.Exit(2)
}
log.Printf("Closing old servers")
for srv := range proxyChan {
srv.Close()
}
log.Printf("Servers closed")
proxyChan = makeProxyChan(container)
if err = proxyContainer(c, proxyChan); err != nil {
log.Printf("%v", err)
os.Exit(2)
}
default:
log.Printf("Not handling event: %v", event)
}
}
}
log.Printf("Stopped handling events")
return nil
}
func proxyContainer(container *docker.Container, proxyChan chan net.Listener) error {
ip := container.NetworkSettings.IpAddress
ports := container.NetworkSettings.Ports
if len(ports) != 0 {
for key, _ := range ports {
port, proto := utils.SplitPort(key)
local := fmt.Sprintf("%v://0.0.0.0:%v", proto, port)
remote := fmt.Sprintf("%v://%v:%v", proto, ip, port)
out := fmt.Sprintf("Proxying %s:%s/%s", ip, port, proto)
log.Printf(out)
srv, err := gocat.NewProxy(local, remote)
if err != nil {
return err
}
proxyChan <- srv
}
}
close(proxyChan)
return nil
}
func makeProxyChan(container *docker.Container) chan net.Listener {
return make(chan net.Listener, len(container.NetworkSettings.Ports))
}