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init.go
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init.go
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package service
import (
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"errors"
"fmt"
"log"
"net"
"net/http"
"os"
"strings"
"sync"
"time"
etcd "github.com/coreos/etcd/client"
"github.com/coreos/etcd/pkg/transport"
)
var (
logger *log.Logger
clientSingleton etcd.Client
clientSingletonO = &sync.Once{}
hostname string
)
func KAPI() etcd.KeysAPI {
return etcd.NewKeysAPI(Client())
}
func Client() etcd.Client {
clientSingletonO.Do(func() {
var err error
hosts := []string{"http://localhost:2379"}
if len(os.Getenv("ETCD_HOSTS")) != 0 {
hosts = strings.Split(os.Getenv("ETCD_HOSTS"), ",")
} else if len(os.Getenv("ETCD_HOST")) != 0 {
hosts = []string{os.Getenv("ETCD_HOST")}
} else if len(os.Getenv("ETCD_1_PORT_2379_TCP_ADDR")) != 0 {
hosts = []string{
"http://" +
os.Getenv("ETCD_1_PORT_2379_TCP_ADDR") +
":" + os.Getenv("ETCD_1_PORT_2379_TCP_PORT"),
}
}
cacert := os.Getenv("ETCD_CACERT")
tlskey := os.Getenv("ETCD_TLS_KEY")
tlscert := os.Getenv("ETCD_TLS_CERT")
if len(cacert) != 0 && len(tlskey) != 0 && len(tlscert) != 0 {
for i, host := range hosts {
if !strings.Contains(host, "https://") {
hosts[i] = strings.Replace(host, "http", "https", 1)
}
}
var tlsconfig *tls.Config
if os.Getenv("ETCD_TLS_INMEMORY") == "true" {
tlsconfig, err = tlsconfigFromMemory(tlscert, tlskey, cacert)
} else {
tlsconfig, err = tlsconfigFromFiles(tlscert, tlskey, cacert)
}
if err != nil {
panic(err)
}
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).Dial,
TLSHandshakeTimeout: 10 * time.Second,
TLSClientConfig: tlsconfig,
}
c, err := etcd.New(etcd.Config{Endpoints: hosts, Transport: transport})
if err != nil {
panic(err)
}
clientSingleton = c
} else {
clientSingleton, err = etcd.New(etcd.Config{Endpoints: hosts, Transport: etcd.DefaultTransport})
if err != nil {
panic(err)
}
}
})
return clientSingleton
}
func init() {
if len(os.Getenv("HOSTNAME")) != 0 {
hostname = os.Getenv("HOSTNAME")
} else {
h, err := os.Hostname()
if err != nil {
panic(err)
}
hostname = h
}
logger = log.New(os.Stderr, "[etcd-discovery] ", log.LstdFlags)
}
func tlsconfigFromFiles(cert, key, ca string) (*tls.Config, error) {
return transport.TLSInfo{
CertFile: cert, KeyFile: key, TrustedCAFile: ca,
}.ClientConfig()
}
func tlsconfigFromMemory(certb64, keyb64, cab64 string) (*tls.Config, error) {
certpem, err := base64.StdEncoding.DecodeString(certb64)
if err != nil {
return nil, err
}
keypem, err := base64.StdEncoding.DecodeString(keyb64)
if err != nil {
return nil, err
}
capem, err := base64.StdEncoding.DecodeString(cab64)
if err != nil {
return nil, err
}
ca, _ := pem.Decode(capem)
if ca == nil {
return nil, errors.New("ca: invalid PEM")
}
certPool := x509.NewCertPool()
caCert, err := x509.ParseCertificate(ca.Bytes)
if err != nil {
return nil, fmt.Errorf("ca: not a valid certificate %v", err)
}
certPool.AddCert(caCert)
certkey, err := tls.X509KeyPair(certpem, keypem)
if err != nil {
return nil, fmt.Errorf("cert/key: invalid key pair/certificate %v", err)
}
return &tls.Config{
Certificates: []tls.Certificate{certkey},
RootCAs: certPool,
MinVersion: tls.VersionTLS12,
}, nil
}