// Create a backend server
func postServer(rw http.ResponseWriter, req *http.Request) {
// /services/{svcId}/servers
svcId := req.URL.Query().Get(":svcId")
server, err := parseReqServer(req)
if err != nil {
writeError(rw, req, err, http.StatusBadRequest)
return
}
// idempotent additions (don't update server on post)
if srv, _ := common.GetServer(svcId, server.Id); srv != nil {
writeBody(rw, req, server, http.StatusOK)
return
}
// localhost doesn't work properly, use service.Host
if server.Host == "127.0.0.1" {
server.GenHost(svcId)
}
// save to cluster
err = cluster.SetServer(svcId, server)
if err != nil {
writeError(rw, req, err, http.StatusInternalServerError)
return
}
// todo: or service (which would include server)
writeBody(rw, req, server, http.StatusOK)
}
// Get information about a backend server
func getServer(rw http.ResponseWriter, req *http.Request) {
// /services/{svcId}/servers/{srvId}
svcId := req.URL.Query().Get(":svcId")
srvId := req.URL.Query().Get(":srvId")
server, err := common.GetServer(svcId, srvId)
if err != nil {
writeError(rw, req, err, http.StatusNotFound)
return
}
writeBody(rw, req, server, http.StatusOK)
}
// DeleteServer tells all members to remove the server from their database.
// rolls back on failure
func (r *Redis) DeleteServer(svcId, srvId string) error {
conn := pool.Get()
defer conn.Close()
oldServer, err := common.GetServer(svcId, srvId)
// mustn't return nil here to ensure cluster removes the server
if err != nil && !strings.Contains(err.Error(), "No Server Found") {
return err
}
// publishStringJson to others
// todo: swap srv/svc ids to match backender interface for better readability
err = r.publishString(conn, "delete-server", srvId, svcId)
if err != nil {
return err
}
actionHash := fmt.Sprintf("%x", md5.Sum([]byte(fmt.Sprintf("delete-server %s %s", srvId, svcId))))
// ensure all members applied action
err = r.waitForMembers(conn, actionHash)
if err != nil {
uActionHash := fmt.Sprintf("%x", md5.Sum([]byte(fmt.Sprintf("set-server %s %s", *oldServer, 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-server", svcId, oldServer)
if uerr != nil {
err = fmt.Errorf("%v - %v", err, uerr)
}
return err
}
if database.CentralStore {
return database.DeleteServer(svcId, srvId)
}
return nil
}
func (n None) GetServer(svcId, srvId string) (*core.Server, error) {
return common.GetServer(svcId, srvId)
}