Merge pull request #176 from omnistream/master
Switch ETCD client to official client
Peter Bourgon
7 years ago
| 0 | 0 | package etcd |
| 1 | 1 | |
| 2 | 2 | import ( |
| 3 | "fmt" | |
| 4 | "strings" | |
| 3 | "crypto/tls" | |
| 4 | "crypto/x509" | |
| 5 | "io/ioutil" | |
| 6 | "net" | |
| 7 | "net/http" | |
| 8 | "time" | |
| 5 | 9 | |
| 6 | "github.com/coreos/go-etcd/etcd" | |
| 10 | etcd "github.com/coreos/etcd/client" | |
| 11 | "golang.org/x/net/context" | |
| 7 | 12 | ) |
| 8 | 13 | |
| 9 | 14 | // Client is a wrapper arround the etcd client. |
| 16 | 21 | } |
| 17 | 22 | |
| 18 | 23 | type client struct { |
| 19 | *etcd.Client | |
| 24 | keysAPI etcd.KeysAPI | |
| 25 | ctx context.Context | |
| 26 | } | |
| 27 | ||
| 28 | type ClientOptions struct { | |
| 29 | Cert string | |
| 30 | Key string | |
| 31 | CaCert string | |
| 32 | DialTimeout time.Duration | |
| 33 | DialKeepAline time.Duration | |
| 34 | HeaderTimeoutPerRequest time.Duration | |
| 20 | 35 | } |
| 21 | 36 | |
| 22 | 37 | // NewClient returns an *etcd.Client with a connection to the named machines. |
| 23 | 38 | // It will return an error if a connection to the cluster cannot be made. |
| 24 | 39 | // The parameter machines needs to be a full URL with schemas. |
| 25 | // e.g. "http://localhost:4001" will work, but "localhost:4001" will not. | |
| 26 | func NewClient(machines []string, cert, key, caCert string) (Client, error) { | |
| 27 | var c *etcd.Client | |
| 28 | var err error | |
| 40 | // e.g. "http://localhost:2379" will work, but "localhost:2379" will not. | |
| 41 | func NewClient(ctx context.Context, machines []string, options *ClientOptions) (Client, error) { | |
| 42 | var ( | |
| 43 | c etcd.KeysAPI | |
| 44 | err error | |
| 45 | caCertCt []byte | |
| 46 | tlsCert tls.Certificate | |
| 47 | ) | |
| 48 | if options == nil { | |
| 49 | options = &ClientOptions{} | |
| 50 | } | |
| 29 | 51 | |
| 30 | if cert != "" && key != "" { | |
| 31 | c, err = etcd.NewTLSClient(machines, cert, key, caCert) | |
| 52 | if options.Cert != "" && options.Key != "" { | |
| 53 | tlsCert, err = tls.LoadX509KeyPair(options.Cert, options.Key) | |
| 32 | 54 | if err != nil { |
| 33 | 55 | return nil, err |
| 34 | 56 | } |
| 57 | ||
| 58 | caCertCt, err = ioutil.ReadFile(options.CaCert) | |
| 59 | if err != nil { | |
| 60 | return nil, err | |
| 61 | } | |
| 62 | caCertPool := x509.NewCertPool() | |
| 63 | caCertPool.AppendCertsFromPEM(caCertCt) | |
| 64 | ||
| 65 | tlsConfig := &tls.Config{ | |
| 66 | Certificates: []tls.Certificate{tlsCert}, | |
| 67 | RootCAs: caCertPool, | |
| 68 | } | |
| 69 | ||
| 70 | transport := &http.Transport{ | |
| 71 | TLSClientConfig: tlsConfig, | |
| 72 | Dial: func(network, addr string) (net.Conn, error) { | |
| 73 | dial := &net.Dialer{ | |
| 74 | Timeout: options.DialTimeout, | |
| 75 | KeepAlive: options.DialKeepAline, | |
| 76 | } | |
| 77 | return dial.Dial(network, addr) | |
| 78 | }, | |
| 79 | } | |
| 80 | ||
| 81 | cfg := etcd.Config{ | |
| 82 | Endpoints: machines, | |
| 83 | Transport: transport, | |
| 84 | HeaderTimeoutPerRequest: options.HeaderTimeoutPerRequest, | |
| 85 | } | |
| 86 | ce, err := etcd.New(cfg) | |
| 87 | if err != nil { | |
| 88 | return nil, err | |
| 89 | } | |
| 90 | c = etcd.NewKeysAPI(ce) | |
| 35 | 91 | } else { |
| 36 | c = etcd.NewClient(machines) | |
| 92 | cfg := etcd.Config{ | |
| 93 | Endpoints: machines, | |
| 94 | Transport: etcd.DefaultTransport, | |
| 95 | HeaderTimeoutPerRequest: options.HeaderTimeoutPerRequest, | |
| 96 | } | |
| 97 | ce, err := etcd.New(cfg) | |
| 98 | if err != nil { | |
| 99 | return nil, err | |
| 100 | } | |
| 101 | c = etcd.NewKeysAPI(ce) | |
| 37 | 102 | } |
| 38 | success := c.SetCluster(machines) | |
| 39 | if !success { | |
| 40 | return nil, fmt.Errorf("cannot connect to the etcd cluster: %s", strings.Join(machines, ",")) | |
| 41 | } | |
| 42 | return &client{c}, nil | |
| 103 | return &client{c, ctx}, nil | |
| 43 | 104 | } |
| 44 | 105 | |
| 45 | 106 | // GetEntries implements the etcd Client interface. |
| 46 | 107 | func (c *client) GetEntries(key string) ([]string, error) { |
| 47 | resp, err := c.Get(key, false, true) | |
| 108 | resp, err := c.keysAPI.Get(c.ctx, key, &etcd.GetOptions{Recursive: true}) | |
| 48 | 109 | if err != nil { |
| 49 | 110 | return nil, err |
| 50 | 111 | } |
| 58 | 119 | |
| 59 | 120 | // WatchPrefix implements the etcd Client interface. |
| 60 | 121 | func (c *client) WatchPrefix(prefix string, responseChan chan *etcd.Response) { |
| 61 | c.Watch(prefix, 0, true, responseChan, nil) | |
| 122 | watch := c.keysAPI.Watcher(prefix, &etcd.WatcherOptions{AfterIndex: 0, Recursive: true}) | |
| 123 | for { | |
| 124 | res, err := watch.Next(c.ctx) | |
| 125 | if err != nil { | |
| 126 | return | |
| 127 | } | |
| 128 | responseChan <- res | |
| 129 | } | |
| 62 | 130 | } |