133 lines
3.4 KiB
Go
133 lines
3.4 KiB
Go
package consul
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import (
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"fmt"
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"log"
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"net/http"
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"time"
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consul "github.com/hashicorp/consul/api"
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)
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type Service struct {
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AppID string
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Name string
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Address string
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IP string
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Port int
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TTL time.Duration
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ConsulAgent *consul.Agent
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}
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var ErrServiceUnavailable = fmt.Errorf("Service is unavailable")
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func NewService(serverAddr, appID, appName, ip, domain string, appPort int) (*Service, error) {
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s := new(Service)
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s.AppID = appID
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s.Name = appName
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s.Address = domain
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s.IP = ip
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s.Port = appPort
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s.TTL = time.Second * 15
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client, err := consul.NewClient(newClientConfig(serverAddr))
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if err != nil {
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return nil, err
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}
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s.ConsulAgent = client.Agent()
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return s, nil
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}
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func newClientConfig(serverAddr string) *consul.Config {
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conf := consul.DefaultConfig()
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conf.Address = serverAddr
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return conf
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}
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func (s *Service) Register() error {
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def := &consul.AgentServiceRegistration{
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ID: s.Name + "_" + s.AppID,
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Name: s.Name,
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Address: s.IP,
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Port: s.Port,
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Tags: s.getTags(),
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Check: &consul.AgentServiceCheck{
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TTL: s.TTL.String(),
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},
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}
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if err := s.ConsulAgent.ServiceRegister(def); err != nil {
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return err
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}
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go s.UpdateTTL(def)
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return nil
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}
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func (s *Service) Unregister() error {
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return s.ConsulAgent.ServiceDeregister(s.AppID)
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}
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func (s *Service) UpdateTTL(service *consul.AgentServiceRegistration) {
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ticker := time.NewTicker(s.TTL / 2)
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for range ticker.C {
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ok, err := s.check()
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if !ok {
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if err := s.ConsulAgent.FailTTL("service:"+s.Name+"_"+s.AppID, err.Error()); err != nil {
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log.Println(err)
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}
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} else {
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if err := s.ConsulAgent.PassTTL("service:"+s.AppID, "OK"); err != nil {
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log.Println(err)
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}
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}
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}
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}
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func (s *Service) check() (bool, error) {
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client := &http.Client{}
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healthUrl := fmt.Sprintf("http://%s:%d/health", s.IP, s.Port)
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req, err := http.NewRequest(http.MethodGet, healthUrl, nil)
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if err != nil {
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return false, ErrServiceUnavailable
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}
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req.Header.Set("User-Agent", "Health Check")
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resp, err := client.Do(req)
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if err != nil {
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return false, ErrServiceUnavailable
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}
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defer resp.Body.Close()
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if resp.StatusCode == http.StatusOK {
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return true, nil
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}
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return false, ErrServiceUnavailable
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}
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func (s *Service) getTags() []string {
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fullName := fmt.Sprintf("%s-%s", s.Name, s.AppID)
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bFullAddr := fmt.Sprintf("http://%s:%d/", s.IP, s.Port) // FIXME: declare one once - dont need to refresh....
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tags := []string{
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"traefik.enable=true",
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"traefik.http.routers." + s.Name + ".rule=Host(`" + s.Address + "`)",
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"traefik.http.routers." + s.Name + ".entryPoints=https",
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"traefik.http.routers." + s.Name + ".service=" + s.Name,
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"traefik.http.routers." + s.Name + ".middlewares=compress,requestid",
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"traefik.http.routers." + s.Name + ".tls=true",
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// "traefik.http.services." + s.Name + ".loadbalancer.server.scheme=http",
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// "traefik.http.services." + s.Name + ".loadbalancer.server.port=" + port,
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"traefik.http.services." + s.Name + ".loadbalancer.passhostheader=false",
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"traefik.http.services." + s.Name + ".loadbalancer.servers." + fullName + ".url=" + bFullAddr,
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"traefik.http.middlewares.compress.compress=true",
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"traefik.http.middlewares.requestid.plugin.requestid.headerName=X-Request-ID",
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// "traefik.http.services." + fullName + ".loadbalancer.healthcheck.path=/health",
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// "traefik.http.services." + fullName + ".loadbalancer.healthcheck.interval=10s",
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}
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return tags
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}
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