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// Copyright 2016 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package etcdmain
import (
"fmt"
"net"
"net/url"
"os"
"time"
"github.com/coreos/etcd/proxy/tcpproxy"
"github.com/spf13/cobra"
)
var (
gatewayListenAddr string
gatewayEndpoints []string
gatewayDNSCluster string
gatewayInsecureDiscovery bool
getewayRetryDelay time.Duration
gatewayCA string
)
var (
rootCmd = &cobra.Command{
Use: "etcd",
Short: "etcd server",
SuggestFor: []string{"etcd"},
}
)
func init() {
rootCmd.AddCommand(newGatewayCommand())
}
// newGatewayCommand returns the cobra command for "gateway".
func newGatewayCommand() *cobra.Command {
lpc := &cobra.Command{
Use: "gateway <subcommand>",
Short: "gateway related command",
}
lpc.AddCommand(newGatewayStartCommand())
return lpc
}
func newGatewayStartCommand() *cobra.Command {
cmd := cobra.Command{
Use: "start",
Short: "start the gateway",
Run: startGateway,
}
cmd.Flags().StringVar(&gatewayListenAddr, "listen-addr", "127.0.0.1:23790", "listen address")
cmd.Flags().StringVar(&gatewayDNSCluster, "discovery-srv", "", "DNS domain used to bootstrap initial cluster")
cmd.Flags().BoolVar(&gatewayInsecureDiscovery, "insecure-discovery", false, "accept insecure SRV records")
cmd.Flags().StringVar(&gatewayCA, "trusted-ca-file", "", "path to the client server TLS CA file.")
cmd.Flags().StringSliceVar(&gatewayEndpoints, "endpoints", []string{"127.0.0.1:2379"}, "comma separated etcd cluster endpoints")
cmd.Flags().DurationVar(&getewayRetryDelay, "retry-delay", time.Minute, "duration of delay before retrying failed endpoints")
return &cmd
}
func stripSchema(eps []string) []string {
var endpoints []string
for _, ep := range eps {
if u, err := url.Parse(ep); err == nil && u.Host != "" {
ep = u.Host
}
endpoints = append(endpoints, ep)
}
return endpoints
}
func startGateway(cmd *cobra.Command, args []string) {
endpoints := gatewayEndpoints
if eps := discoverEndpoints(gatewayDNSCluster, gatewayCA, gatewayInsecureDiscovery); len(eps) != 0 {
endpoints = eps
}
// Strip the schema from the endpoints because we start just a TCP proxy
endpoints = stripSchema(endpoints)
if len(endpoints) == 0 {
plog.Fatalf("no endpoints found")
}
l, err := net.Listen("tcp", gatewayListenAddr)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
tp := tcpproxy.TCPProxy{
Listener: l,
Endpoints: endpoints,
MonitorInterval: getewayRetryDelay,
}
// At this point, etcd gateway listener is initialized
notifySystemd()
tp.Run()
}
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