package nomad import ( "context" "errors" "fmt" "hash/fnv" "net" "sort" "strconv" "strings" "github.com/traefik/traefik/v2/pkg/config/dynamic" "github.com/traefik/traefik/v2/pkg/config/label" "github.com/traefik/traefik/v2/pkg/log" "github.com/traefik/traefik/v2/pkg/provider" "github.com/traefik/traefik/v2/pkg/provider/constraints" ) func (p *Provider) buildConfig(ctx context.Context, items []item) *dynamic.Configuration { configurations := make(map[string]*dynamic.Configuration) for _, i := range items { svcName := provider.Normalize(i.Node + "-" + i.Name + "-" + i.ID) ctxSvc := log.With(ctx, log.Str(log.ServiceName, svcName)) if !p.keepItem(ctxSvc, i) { continue } logger := log.FromContext(ctx) labels := tagsToLabels(i.Tags, p.Prefix) config, err := label.DecodeConfiguration(labels) if err != nil { logger.Errorf("Failed to decode configuration: %v", err) continue } var tcpOrUDP bool if len(config.TCP.Routers) > 0 || len(config.TCP.Services) > 0 { tcpOrUDP = true if err := p.buildTCPConfig(i, config.TCP); err != nil { logger.Errorf("Failed to build TCP service configuration: %v", err) continue } provider.BuildTCPRouterConfiguration(ctxSvc, config.TCP) } if len(config.UDP.Routers) > 0 || len(config.UDP.Services) > 0 { tcpOrUDP = true if err := p.buildUDPConfig(i, config.UDP); err != nil { logger.Errorf("Failed to build UDP service configuration: %v", err) continue } provider.BuildUDPRouterConfiguration(ctxSvc, config.UDP) } // tcp/udp, skip configuring http service if tcpOrUDP && len(config.HTTP.Routers) == 0 && len(config.HTTP.Middlewares) == 0 && len(config.HTTP.Services) == 0 { configurations[svcName] = config continue } // configure http service if err := p.buildServiceConfig(i, config.HTTP); err != nil { logger.Errorf("Failed to build HTTP service configuration: %v", err) continue } model := struct { Name string Labels map[string]string }{ Name: i.Name, Labels: labels, } provider.BuildRouterConfiguration(ctx, config.HTTP, getName(i), p.defaultRuleTpl, model) configurations[svcName] = config } return provider.Merge(ctx, configurations) } func (p *Provider) buildTCPConfig(i item, configuration *dynamic.TCPConfiguration) error { if len(configuration.Services) == 0 { configuration.Services = make(map[string]*dynamic.TCPService) lb := new(dynamic.TCPServersLoadBalancer) lb.SetDefaults() configuration.Services[getName(i)] = &dynamic.TCPService{ LoadBalancer: lb, } } for _, service := range configuration.Services { if err := p.addServerTCP(i, service.LoadBalancer); err != nil { return err } } return nil } func (p *Provider) buildUDPConfig(i item, configuration *dynamic.UDPConfiguration) error { if len(configuration.Services) == 0 { configuration.Services = make(map[string]*dynamic.UDPService) configuration.Services[getName(i)] = &dynamic.UDPService{ LoadBalancer: new(dynamic.UDPServersLoadBalancer), } } for _, service := range configuration.Services { if err := p.addServerUDP(i, service.LoadBalancer); err != nil { return err } } return nil } func (p *Provider) buildServiceConfig(i item, configuration *dynamic.HTTPConfiguration) error { if len(configuration.Services) == 0 { configuration.Services = make(map[string]*dynamic.Service) lb := new(dynamic.ServersLoadBalancer) lb.SetDefaults() configuration.Services[getName(i)] = &dynamic.Service{ LoadBalancer: lb, } } for _, service := range configuration.Services { if err := p.addServer(i, service.LoadBalancer); err != nil { return err } } return nil } // TODO: check whether it is mandatory to filter again. func (p *Provider) keepItem(ctx context.Context, i item) bool { logger := log.FromContext(ctx) if !i.ExtraConf.Enable { logger.Debug("Filtering disabled item") return false } matches, err := constraints.MatchTags(i.Tags, p.Constraints) if err != nil { logger.Errorf("Error matching constraint expressions: %v", err) return false } if !matches { logger.Debugf("Filtering out item due to constraints: %q", p.Constraints) return false } // TODO: filter on health when that information exists (nomad 1.4+) return true } func (p *Provider) addServerTCP(i item, lb *dynamic.TCPServersLoadBalancer) error { if lb == nil { return errors.New("load-balancer is missing") } var port string if len(lb.Servers) > 0 { port = lb.Servers[0].Port } if len(lb.Servers) == 0 { lb.Servers = []dynamic.TCPServer{{}} } if i.Port != 0 && port == "" { port = strconv.Itoa(i.Port) } lb.Servers[0].Port = "" if port == "" { return errors.New("port is missing") } if i.Address == "" { return errors.New("address is missing") } lb.Servers[0].Address = net.JoinHostPort(i.Address, port) return nil } func (p *Provider) addServerUDP(i item, lb *dynamic.UDPServersLoadBalancer) error { if lb == nil { return errors.New("load-balancer is missing") } var port string if len(lb.Servers) > 0 { port = lb.Servers[0].Port } if len(lb.Servers) == 0 { lb.Servers = []dynamic.UDPServer{{}} } if i.Port != 0 && port == "" { port = strconv.Itoa(i.Port) } lb.Servers[0].Port = "" if port == "" { return errors.New("port is missing") } if i.Address == "" { return errors.New("address is missing") } lb.Servers[0].Address = net.JoinHostPort(i.Address, port) return nil } func (p *Provider) addServer(i item, lb *dynamic.ServersLoadBalancer) error { if lb == nil { return errors.New("load-balancer is missing") } var port string if len(lb.Servers) > 0 { port = lb.Servers[0].Port } if len(lb.Servers) == 0 { server := dynamic.Server{} server.SetDefaults() lb.Servers = []dynamic.Server{server} } if i.Port != 0 && port == "" { port = strconv.Itoa(i.Port) } lb.Servers[0].Port = "" if port == "" { return errors.New("port is missing") } if i.Address == "" { return errors.New("address is missing") } scheme := lb.Servers[0].Scheme lb.Servers[0].Scheme = "" lb.Servers[0].URL = fmt.Sprintf("%s://%s", scheme, net.JoinHostPort(i.Address, port)) return nil } func getName(i item) string { if !i.ExtraConf.Canary { return provider.Normalize(i.Name) } tags := make([]string, len(i.Tags)) copy(tags, i.Tags) sort.Strings(tags) hasher := fnv.New64() hasher.Write([]byte(strings.Join(tags, ""))) return provider.Normalize(fmt.Sprintf("%s-%d", i.Name, hasher.Sum64())) }