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package dbserver
import (
"context"
"errors"
"fmt"
"net"
"net/http"
"os"
"strconv"
"github.com/containerd/log"
"github.com/docker/docker/libnetwork/cmd/networkdb-test/dummyclient"
"github.com/docker/docker/libnetwork/diagnostic"
"github.com/docker/docker/libnetwork/networkdb"
)
var (
nDB *networkdb.NetworkDB
server *diagnostic.Server
ipAddr string
)
func ipaddress(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "%s\n", ipAddr)
}
// Server starts the server
func Server(args []string) {
log.G(context.TODO()).Infof("[SERVER] Starting with arguments %v", args)
if len(args) < 1 {
log.G(context.TODO()).Fatal("Port number is a mandatory argument, aborting...")
}
port, _ := strconv.Atoi(args[0])
var localNodeName string
var ok bool
if localNodeName, ok = os.LookupEnv("TASK_ID"); !ok {
log.G(context.TODO()).Fatal("TASK_ID environment variable not set, aborting...")
}
log.G(context.TODO()).Infof("[SERVER] Starting node %s on port %d", localNodeName, port)
ip, err := getIPInterface("eth0")
if err != nil {
log.G(context.TODO()).Errorf("%s There was a problem with the IP %s\n", localNodeName, err)
return
}
ipAddr = ip
log.G(context.TODO()).Infof("%s uses IP %s\n", localNodeName, ipAddr)
server = diagnostic.New()
conf := networkdb.DefaultConfig()
conf.Hostname = localNodeName
conf.AdvertiseAddr = ipAddr
conf.BindAddr = ipAddr
nDB, err = networkdb.New(conf)
if err != nil {
log.G(context.TODO()).Infof("%s error in the DB init %s\n", localNodeName, err)
return
}
// Register network db handlers
nDB.RegisterDiagnosticHandlers(server)
server.HandleFunc("/myip", ipaddress)
dummyclient.RegisterDiagnosticHandlers(server, nDB)
server.EnableDiagnostic("", port)
// block here
select {}
}
func getIPInterface(name string) (string, error) {
ifaces, err := net.Interfaces()
if err != nil {
return "", err
}
for _, iface := range ifaces {
if iface.Name != name {
continue // not the name specified
}
if iface.Flags&net.FlagUp == 0 {
return "", errors.New("Interfaces is down")
}
addrs, err := iface.Addrs()
if err != nil {
return "", err
}
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if ip == nil || ip.IsLoopback() {
continue
}
ip = ip.To4()
if ip == nil {
continue
}
return ip.String(), nil
}
return "", errors.New("Interfaces does not have a valid IPv4")
}
return "", errors.New("Interface not found")
}
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