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etcd.go
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etcd.go
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// Copyright (c) 2016 by António Meireles <antonio.meireles@reformi.st>.
//
// 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.
//
// adapted from github.com/kubernetes/minikube/pkg/localkube/etcd.go
//
package server
import (
"crypto/tls"
"fmt"
"net"
"net/http"
"time"
"github.com/coreos/etcd/client"
"github.com/coreos/etcd/etcdserver"
"github.com/coreos/etcd/etcdserver/api/v2http"
"github.com/coreos/etcd/pkg/transport"
"github.com/coreos/etcd/pkg/types"
)
const (
EtcdName = "corectld.store"
)
var (
// EtcdClientURLs have listeners created and handle etcd API traffic
EtcdClientURLs = []string{"http://localhost:2379"}
// EtcdPeerURLs don't have listeners created for them, they are used to pass
// Etcd validation
EtcdPeerURLs = []string{"http://localhost:2380"}
)
// Etcd is a Server which manages an Etcd cluster
type EtcdServer struct {
*etcdserver.EtcdServer
config *etcdserver.ServerConfig
clientListens []net.Listener
}
// NewEtcd creates a new default etcd Server using 'dataDir' for persistence.
// Panics if could not be configured.
func (d *ServerContext) NewEtcd(clientURLStrs,
peerURLStrs []string, name, dataDirectory string) error {
clientURLs, err := types.NewURLs(clientURLStrs)
if err != nil {
return err
}
peerURLs, err := types.NewURLs(peerURLStrs)
if err != nil {
return err
}
d.EtcdServer = &EtcdServer{
config: &etcdserver.ServerConfig{
Name: name,
ClientURLs: clientURLs,
PeerURLs: peerURLs,
DataDir: dataDirectory,
InitialPeerURLsMap: map[string]types.URLs{
name: peerURLs,
},
NewCluster: true,
SnapCount: etcdserver.DefaultSnapCount,
MaxSnapFiles: 5,
MaxWALFiles: 5,
TickMs: 100,
ElectionTicks: 10,
},
}
if err := d.EtcdServer.Start(); err != nil {
return err
}
// set client
etcdc, err := client.
New(client.Config{
Endpoints: clientURLStrs,
Transport: client.DefaultTransport,
HeaderTimeoutPerRequest: 1 * time.Second,
})
if err != nil {
return err
}
d.EtcdClient = client.NewKeysAPI(etcdc)
return nil
}
// Starts starts the etcd server and listening for client connections
func (e *EtcdServer) Start() (err error) {
e.EtcdServer, err = etcdserver.NewServer(e.config)
if err != nil {
return fmt.Errorf("Etcd config error: %v", err)
}
// create client listeners
clientListeners, err := createListeners(e.config.ClientURLs)
if err != nil {
return
}
// start etcd
e.EtcdServer.Start()
// setup client listeners
ch := v2http.NewClientHandler(e.EtcdServer, e.requestTimeout())
for _, l := range clientListeners {
go func(l net.Listener) {
srv := &http.Server{
Handler: ch,
ReadTimeout: 5 * time.Minute,
}
panic(srv.Serve(l))
}(l)
}
return
}
// Stop closes all connections and stops the Etcd server
func (e *EtcdServer) Stop() {
if e.EtcdServer != nil {
e.EtcdServer.Stop()
}
for _, l := range e.clientListens {
l.Close()
}
}
func (e *EtcdServer) requestTimeout() time.Duration {
// from github.com/coreos/etcd/etcdserver/config.go
return 5*time.Second + 2*time.Duration(e.config.ElectionTicks)*
time.Duration(e.config.TickMs)*time.Millisecond
}
func createListeners(urls types.URLs) (listeners []net.Listener, err error) {
for _, url := range urls {
var l net.Listener
if l, err = net.Listen("tcp", url.Host); err != nil {
return
}
if l, err = transport.
NewKeepAliveListener(l, url.Scheme, &tls.Config{}); err != nil {
return
}
listeners = append(listeners, l)
}
return
}