package registry import ( "crypto/tls" "errors" "fmt" "net" "net/http" "runtime" "sync" "time" consul "github.com/hashicorp/consul/api" hash "github.com/mitchellh/hashstructure" ) const ( ConsulRegisterTCPCheckKey = "consul_register_tcp_check" ) type consulRegistry struct { Address string Client *consul.Client opts Options sync.Mutex register map[string]uint64 } func newTransport(config *tls.Config) *http.Transport { if config == nil { config = &tls.Config{ InsecureSkipVerify: true, } } t := &http.Transport{ Proxy: http.ProxyFromEnvironment, Dial: (&net.Dialer{ Timeout: 30 * time.Second, KeepAlive: 30 * time.Second, }).Dial, TLSHandshakeTimeout: 10 * time.Second, TLSClientConfig: config, } runtime.SetFinalizer(&t, func(tr **http.Transport) { (*tr).CloseIdleConnections() }) return t } func newConsulRegistry(opts ...Option) Registry { var options Options for _, o := range opts { o(&options) } // use default config config := consul.DefaultConfig() if options.Context != nil { // Use the consul config passed in the options, if available if c, ok := options.Context.Value("consul_config").(*consul.Config); ok { config = c } } // check if there are any addrs if len(options.Addrs) > 0 { addr, port, err := net.SplitHostPort(options.Addrs[0]) if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" { port = "8500" addr = options.Addrs[0] config.Address = fmt.Sprintf("%s:%s", addr, port) } else if err == nil { config.Address = fmt.Sprintf("%s:%s", addr, port) } } // requires secure connection? if options.Secure || options.TLSConfig != nil { if config.HttpClient == nil { config.HttpClient = new(http.Client) } config.Scheme = "https" // We're going to support InsecureSkipVerify config.HttpClient.Transport = newTransport(options.TLSConfig) } // create the client client, _ := consul.NewClient(config) // set timeout if options.Timeout > 0 { config.HttpClient.Timeout = options.Timeout } cr := &consulRegistry{ Address: config.Address, Client: client, opts: options, register: make(map[string]uint64), } return cr } func (c *consulRegistry) Deregister(s *Service) error { if len(s.Nodes) == 0 { return errors.New("Require at least one node") } // delete our hash of the service c.Lock() delete(c.register, s.Name) c.Unlock() node := s.Nodes[0] return c.Client.Agent().ServiceDeregister(node.Id) } func getDeregisterTTL(t time.Duration) time.Duration { // splay slightly for the watcher? splay := time.Second * 5 deregTTL := t + splay // consul has a minimum timeout on deregistration of 1 minute. if t < time.Minute { deregTTL = time.Minute + splay } return deregTTL } func (c *consulRegistry) Register(s *Service, opts ...RegisterOption) error { if len(s.Nodes) == 0 { return errors.New("Require at least one node") } var options RegisterOptions for _, o := range opts { o(&options) } if c.opts.Context != nil { tcpCheckInterval, ok := c.opts.Context. Value(ConsulRegisterTCPCheckKey).(time.Duration) if ok { options.TCPCheck = true options.Interval = tcpCheckInterval } } // create hash of service; uint64 h, err := hash.Hash(s, nil) if err != nil { return err } // use first node node := s.Nodes[0] // get existing hash c.Lock() v, ok := c.register[s.Name] c.Unlock() // if it's already registered and matches then just pass the check if ok && v == h { // if the err is nil we're all good, bail out // if not, we don't know what the state is, so full re-register if err := c.Client.Agent().PassTTL("service:"+node.Id, ""); err == nil { return nil } } // encode the tags tags := encodeMetadata(node.Metadata) tags = append(tags, encodeEndpoints(s.Endpoints)...) tags = append(tags, encodeVersion(s.Version)...) var check *consul.AgentServiceCheck if options.TCPCheck { deregTTL := getDeregisterTTL(options.Interval) check = &consul.AgentServiceCheck{ TCP: fmt.Sprintf("%s:%d", node.Address, node.Port), Interval: fmt.Sprintf("%v", options.Interval), DeregisterCriticalServiceAfter: fmt.Sprintf("%v", deregTTL), } // if the TTL is greater than 0 create an associated check } else if options.TTL > time.Duration(0) { deregTTL := getDeregisterTTL(options.TTL) check = &consul.AgentServiceCheck{ TTL: fmt.Sprintf("%v", options.TTL), DeregisterCriticalServiceAfter: fmt.Sprintf("%v", deregTTL), } } // register the service if err := c.Client.Agent().ServiceRegister(&consul.AgentServiceRegistration{ ID: node.Id, Name: s.Name, Tags: tags, Port: node.Port, Address: node.Address, Check: check, }); err != nil { return err } // save our hash of the service c.Lock() c.register[s.Name] = h c.Unlock() // if the TTL is 0 we don't mess with the checks if options.TTL == time.Duration(0) { return nil } // pass the healthcheck return c.Client.Agent().PassTTL("service:"+node.Id, "") } func (c *consulRegistry) GetService(name string) ([]*Service, error) { rsp, _, err := c.Client.Health().Service(name, "", false, nil) if err != nil { return nil, err } serviceMap := map[string]*Service{} for _, s := range rsp { if s.Service.Service != name { continue } // version is now a tag version, _ := decodeVersion(s.Service.Tags) // service ID is now the node id id := s.Service.ID // key is always the version key := version // address is service address address := s.Service.Address // use node address if len(address) == 0 { address = s.Node.Address } svc, ok := serviceMap[key] if !ok { svc = &Service{ Endpoints: decodeEndpoints(s.Service.Tags), Name: s.Service.Service, Version: version, } serviceMap[key] = svc } var del bool for _, check := range s.Checks { // delete the node if the status is critical if check.Status == "critical" { del = true break } } // if delete then skip the node if del { continue } svc.Nodes = append(svc.Nodes, &Node{ Id: id, Address: address, Port: s.Service.Port, Metadata: decodeMetadata(s.Service.Tags), }) } var services []*Service for _, service := range serviceMap { services = append(services, service) } return services, nil } func (c *consulRegistry) ListServices() ([]*Service, error) { rsp, _, err := c.Client.Catalog().Services(nil) if err != nil { return nil, err } var services []*Service for service := range rsp { services = append(services, &Service{Name: service}) } return services, nil } func (c *consulRegistry) Watch(opts ...WatchOption) (Watcher, error) { return newConsulWatcher(c, opts...) } func (c *consulRegistry) String() string { return "consul" } func (c *consulRegistry) Options() Options { return c.opts }