149 lines
3.6 KiB
Go
149 lines
3.6 KiB
Go
package consul
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import (
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"fmt"
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"net/http"
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"strconv"
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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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Domain string
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Address 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(servAddr, id, name, hostname, domain string, appPort int) (*Service, error) {
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s := new(Service)
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s.AppID = id
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s.Name = name
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s.Address = hostname
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s.Domain = domain
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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(servAddr))
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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) GetID() string {
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return fmt.Sprintf("%s_%s", s.Name, s.AppID)
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}
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func (s *Service) GetFullAddr() string {
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return fmt.Sprintf("http://%s:%d/", s.Address, s.Port)
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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.GetID(),
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Name: s.Name,
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Address: s.Address,
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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 func() { // startup register
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ticker := time.NewTicker(time.Millisecond * 100)
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for range ticker.C {
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ok, _ := s.healthCheck()
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if ok {
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ticker.Stop()
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}
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}
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}()
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go func() { // TTL
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ticker := time.NewTicker(s.TTL)
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for range ticker.C {
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s.healthCheck()
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}
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}()
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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.GetID())
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}
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func (s *Service) healthCheck() (bool, error) {
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alive := func() bool {
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client := &http.Client{}
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healthUrl := s.GetFullAddr() + "health"
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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
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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
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}
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defer resp.Body.Close()
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return resp.StatusCode == http.StatusOK
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}()
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if alive {
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if err := s.ConsulAgent.PassTTL("service:"+s.GetID(), "OK"); err != nil {
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return false, err
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}
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return true, nil
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}
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if err := s.ConsulAgent.FailTTL("service:"+s.GetID(), ErrServiceUnavailable.Error()); err != nil {
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return false, err
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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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tags := []string{
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"traefik.enable=true",
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"traefik.http.routers." + s.Name + ".rule=Host(`" + s.Domain + "`)",
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"traefik.http.routers." + s.Name + ".entryPoints=https",
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"traefik.http.routers." + s.Name + ".tls=true",
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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.services." + s.Name + ".loadbalancer.server.scheme=http",
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"traefik.http.services." + s.Name + ".loadbalancer.server.port=" + strconv.Itoa(s.Port),
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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." + s.Name + ".loadbalancer.passhostheader=false",
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// "traefik.http.services." + s.Name + ".loadbalancer.servers." + fullName + "=" + bFullAddr,
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// "traefik.http.services." + s.Name + ".loadbalancer.servers." + fullName + ".url=" + bFullAddr,
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// "traefik.http.services." + s.Name + ".loadbalancer.healthcheck.path=/health",
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// "traefik.http.services." + s.Name + ".loadbalancer.healthcheck.interval=10s",
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}
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return tags
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}
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