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etcd.go
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etcd.go
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package etcd
import (
"fmt"
"net"
"net/http"
"time"
etcdclient "github.com/coreos/etcd/client"
"golang.org/x/net/context"
"k8s.io/kubernetes/pkg/client/restclient"
etcdutil "k8s.io/kubernetes/pkg/storage/etcd/util"
knet "k8s.io/kubernetes/pkg/util/net"
configapi "github.com/openshift/origin/pkg/cmd/server/api"
)
// GetAndTestEtcdClient creates an etcd client based on the provided config. It will attempt to
// connect to the etcd server and block until the server responds at least once, or return an
// error if the server never responded.
func GetAndTestEtcdClient(etcdClientInfo configapi.EtcdConnectionInfo) (etcdclient.Client, error) {
etcdClient, err := MakeEtcdClient(etcdClientInfo)
if err != nil {
return nil, err
}
if err := TestEtcdClient(etcdClient); err != nil {
return nil, err
}
return etcdClient, nil
}
// MakeEtcdClient creates an etcd client based on the provided config.
func MakeEtcdClient(etcdClientInfo configapi.EtcdConnectionInfo) (etcdclient.Client, error) {
tlsConfig, err := restclient.TLSConfigFor(&restclient.Config{
TLSClientConfig: restclient.TLSClientConfig{
CertFile: etcdClientInfo.ClientCert.CertFile,
KeyFile: etcdClientInfo.ClientCert.KeyFile,
CAFile: etcdClientInfo.CA,
},
})
if err != nil {
return nil, err
}
transport := knet.SetTransportDefaults(&http.Transport{
TLSClientConfig: tlsConfig,
Dial: (&net.Dialer{
// default from http.DefaultTransport
Timeout: 30 * time.Second,
// Lower the keep alive for connections.
KeepAlive: 1 * time.Second,
}).Dial,
// Because watches are very bursty, defends against long delays in watch reconnections.
MaxIdleConnsPerHost: 500,
})
cfg := etcdclient.Config{
Endpoints: etcdClientInfo.URLs,
// TODO: Determine if transport needs optimization
Transport: transport,
}
return etcdclient.New(cfg)
}
// TestEtcdClient verifies a client is functional. It will attempt to
// connect to the etcd server and block until the server responds at least once, or return an
// error if the server never responded.
func TestEtcdClient(etcdClient etcdclient.Client) error {
for i := 0; ; i++ {
_, err := etcdclient.NewKeysAPI(etcdClient).Get(context.Background(), "/", nil)
if err == nil || etcdutil.IsEtcdNotFound(err) {
break
}
if i > 100 {
return fmt.Errorf("could not reach etcd: %v", err)
}
time.Sleep(50 * time.Millisecond)
}
return nil
}