// Get information about a service
func getService(rw http.ResponseWriter, req *http.Request) {
// /services/{svcId}
svcId := req.URL.Query().Get(":svcId")
service, err := common.GetService(svcId)
if err != nil {
writeError(rw, req, err, http.StatusNotFound)
return
}
writeBody(rw, req, service, http.StatusOK)
}
// Get information about a backend server
func getServers(rw http.ResponseWriter, req *http.Request) {
// /services/{svcId}/servers
svcId := req.URL.Query().Get(":svcId")
service, err := common.GetService(svcId)
if err != nil {
writeError(rw, req, err, http.StatusNotFound)
return
}
if service.Servers == nil {
service.Servers = make([]core.Server, 0, 0)
}
// writeBody(rw, req, service, http.StatusOK)
writeBody(rw, req, service.Servers, http.StatusOK)
}
// DeleteService tells all members to remove the service from their database.
// rolls back on failure
func (r *Redis) DeleteService(id string) error {
conn := pool.Get()
defer conn.Close()
oldService, err := common.GetService(id)
// this should not return nil to ensure the service is gone from entire cluster
if err != nil && !strings.Contains(err.Error(), "No Service Found") {
return err
}
// publishString to others
err = r.publishString(conn, "delete-service", id)
if err != nil {
// if i failed to publishString, request should fail
return err
}
actionHash := fmt.Sprintf("%x", md5.Sum([]byte(fmt.Sprintf("delete-service %s", id))))
// ensure all members applied action
err = r.waitForMembers(conn, actionHash)
if err != nil {
uActionHash := fmt.Sprintf("%x", md5.Sum([]byte(fmt.Sprintf("set-service %s", oldService))))
// cleanup rollback cruft. clear actionHash ensures no mistakes on re-submit
defer conn.Do("DEL", uActionHash, actionHash)
// attempt rollback - no need to waitForMembers here
uerr := r.publishJson(conn, "set-service", oldService)
if uerr != nil {
err = fmt.Errorf("%v - %v", err, uerr)
}
return err
}
if database.CentralStore {
return database.DeleteService(id)
}
return nil
}
// SetServers tells all members to replace a service's servers with a new set.
// rolls back on failure
func (r *Redis) SetServers(svcId string, servers []core.Server) error {
conn := pool.Get()
defer conn.Close()
service, err := common.GetService(svcId)
if err != nil {
return NoServiceError
}
oldServers := service.Servers
// publishStringJson to others
err = r.publishStringJson(conn, "set-servers", svcId, servers)
if err != nil {
return err
}
actionHash := fmt.Sprintf("%x", md5.Sum([]byte(fmt.Sprintf("set-servers %s %s", servers, svcId))))
// ensure all members applied action
err = r.waitForMembers(conn, actionHash)
if err != nil {
uActionHash := fmt.Sprintf("%x", md5.Sum([]byte(fmt.Sprintf("set-servers %s %s", oldServers, svcId))))
// cleanup rollback cruft. clear actionHash ensures no mistakes on re-submit
defer conn.Do("DEL", uActionHash, actionHash)
// attempt rollback - no need to waitForMembers here
uerr := r.publishStringJson(conn, "set-servers", svcId, oldServers)
if uerr != nil {
err = fmt.Errorf("%v - %v", err, uerr)
}
return err
}
if database.CentralStore {
return database.SetServers(svcId, servers)
}
return nil
}
// Create a service
func postService(rw http.ResponseWriter, req *http.Request) {
// /services
service, err := parseReqService(req)
if err != nil {
writeError(rw, req, err, http.StatusBadRequest)
return
}
// idempotent additions (don't update service on post)
if svc, _ := common.GetService(service.Id); svc != nil {
writeBody(rw, req, service, http.StatusOK)
return
}
// save to cluster
err = cluster.SetService(service)
if err != nil {
writeError(rw, req, err, http.StatusInternalServerError)
return
}
writeBody(rw, req, service, http.StatusOK)
}
func (n None) GetService(id string) (*core.Service, error) {
return common.GetService(id)
}
// GetService - likely will never be called
func (r *Redis) GetService(id string) (*core.Service, error) {
return common.GetService(id)
}