Implement Traefik provider for Nomad orchestrator
This commit is contained in:
Seth Hoenig
GitHub
parent
becee5e393
commit
aa0b5466a9
23 changed files with 4328 additions and 7 deletions
267
pkg/provider/nomad/config.go
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267
pkg/provider/nomad/config.go
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package nomad
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"strconv"
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"github.com/traefik/traefik/v2/pkg/config/dynamic"
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"github.com/traefik/traefik/v2/pkg/config/label"
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"github.com/traefik/traefik/v2/pkg/log"
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"github.com/traefik/traefik/v2/pkg/provider"
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"github.com/traefik/traefik/v2/pkg/provider/constraints"
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)
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func (p *Provider) buildConfig(ctx context.Context, items []item) *dynamic.Configuration {
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configurations := make(map[string]*dynamic.Configuration)
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for _, i := range items {
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svcName := provider.Normalize(i.Node + "-" + i.Name + "-" + i.ID)
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ctxSvc := log.With(ctx, log.Str(log.ServiceName, svcName))
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if !p.keepItem(ctxSvc, i) {
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continue
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}
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logger := log.FromContext(ctx)
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labels := tagsToLabels(i.Tags, p.Prefix)
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config, err := label.DecodeConfiguration(labels)
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if err != nil {
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logger.Errorf("Failed to decode configuration: %v", err)
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continue
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}
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var tcpOrUDP bool
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if len(config.TCP.Routers) > 0 || len(config.TCP.Services) > 0 {
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tcpOrUDP = true
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if err := p.buildTCPConfig(i, config.TCP); err != nil {
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logger.Errorf("Failed to build TCP service configuration: %v", err)
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continue
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}
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provider.BuildTCPRouterConfiguration(ctxSvc, config.TCP)
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}
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if len(config.UDP.Routers) > 0 || len(config.UDP.Services) > 0 {
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tcpOrUDP = true
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if err := p.buildUDPConfig(i, config.UDP); err != nil {
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logger.Errorf("Failed to build UDP service configuration: %v", err)
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continue
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}
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provider.BuildUDPRouterConfiguration(ctxSvc, config.UDP)
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}
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// tcp/udp, skip configuring http service
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if tcpOrUDP && len(config.HTTP.Routers) == 0 &&
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len(config.HTTP.Middlewares) == 0 &&
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len(config.HTTP.Services) == 0 {
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configurations[svcName] = config
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continue
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}
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// configure http service
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if err := p.buildServiceConfig(i, config.HTTP); err != nil {
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logger.Errorf("Failed to build HTTP service configuration: %v", err)
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continue
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}
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model := struct {
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Name string
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Labels map[string]string
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}{
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Name: i.Name,
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Labels: labels,
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}
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provider.BuildRouterConfiguration(ctx, config.HTTP, provider.Normalize(i.Name), p.defaultRuleTpl, model)
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configurations[svcName] = config
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}
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return provider.Merge(ctx, configurations)
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}
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func (p *Provider) buildTCPConfig(i item, configuration *dynamic.TCPConfiguration) error {
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if len(configuration.Services) == 0 {
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configuration.Services = make(map[string]*dynamic.TCPService)
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lb := new(dynamic.TCPServersLoadBalancer)
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lb.SetDefaults()
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configuration.Services[provider.Normalize(i.Name)] = &dynamic.TCPService{
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LoadBalancer: lb,
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}
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}
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for _, service := range configuration.Services {
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if err := p.addServerTCP(i, service.LoadBalancer); err != nil {
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return err
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}
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}
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return nil
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}
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func (p *Provider) buildUDPConfig(i item, configuration *dynamic.UDPConfiguration) error {
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if len(configuration.Services) == 0 {
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configuration.Services = make(map[string]*dynamic.UDPService)
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configuration.Services[provider.Normalize(i.Name)] = &dynamic.UDPService{
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LoadBalancer: new(dynamic.UDPServersLoadBalancer),
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}
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}
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for _, service := range configuration.Services {
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if err := p.addServerUDP(i, service.LoadBalancer); err != nil {
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return err
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}
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}
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return nil
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}
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func (p *Provider) buildServiceConfig(i item, configuration *dynamic.HTTPConfiguration) error {
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if len(configuration.Services) == 0 {
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configuration.Services = make(map[string]*dynamic.Service)
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lb := new(dynamic.ServersLoadBalancer)
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lb.SetDefaults()
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configuration.Services[provider.Normalize(i.Name)] = &dynamic.Service{
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LoadBalancer: lb,
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}
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}
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for _, service := range configuration.Services {
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if err := p.addServer(i, service.LoadBalancer); err != nil {
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return err
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}
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}
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return nil
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}
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// TODO: check whether it is mandatory to filter again.
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func (p *Provider) keepItem(ctx context.Context, i item) bool {
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logger := log.FromContext(ctx)
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if !i.ExtraConf.Enable {
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logger.Debug("Filtering disabled item")
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return false
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}
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matches, err := constraints.MatchTags(i.Tags, p.Constraints)
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if err != nil {
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logger.Errorf("Error matching constraint expressions: %v", err)
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return false
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}
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if !matches {
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logger.Debugf("Filtering out item due to constraints: %q", p.Constraints)
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return false
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}
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// TODO: filter on health when that information exists (nomad 1.4+)
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return true
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}
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func (p *Provider) addServerTCP(i item, lb *dynamic.TCPServersLoadBalancer) error {
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if lb == nil {
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return errors.New("load-balancer is missing")
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}
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var port string
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if len(lb.Servers) > 0 {
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port = lb.Servers[0].Port
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}
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if len(lb.Servers) == 0 {
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lb.Servers = []dynamic.TCPServer{{}}
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}
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if i.Port != 0 && port == "" {
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port = strconv.Itoa(i.Port)
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}
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lb.Servers[0].Port = ""
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if port == "" {
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return errors.New("port is missing")
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}
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if i.Address == "" {
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return errors.New("address is missing")
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}
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lb.Servers[0].Address = net.JoinHostPort(i.Address, port)
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return nil
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}
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func (p *Provider) addServerUDP(i item, lb *dynamic.UDPServersLoadBalancer) error {
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if lb == nil {
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return errors.New("load-balancer is missing")
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}
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var port string
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if len(lb.Servers) > 0 {
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port = lb.Servers[0].Port
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}
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if len(lb.Servers) == 0 {
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lb.Servers = []dynamic.UDPServer{{}}
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}
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if i.Port != 0 && port == "" {
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port = strconv.Itoa(i.Port)
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}
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lb.Servers[0].Port = ""
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if port == "" {
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return errors.New("port is missing")
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}
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if i.Address == "" {
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return errors.New("address is missing")
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}
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lb.Servers[0].Address = net.JoinHostPort(i.Address, port)
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return nil
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}
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func (p *Provider) addServer(i item, lb *dynamic.ServersLoadBalancer) error {
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if lb == nil {
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return errors.New("load-balancer is missing")
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}
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var port string
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if len(lb.Servers) > 0 {
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port = lb.Servers[0].Port
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}
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if len(lb.Servers) == 0 {
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server := dynamic.Server{}
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server.SetDefaults()
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lb.Servers = []dynamic.Server{server}
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}
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if i.Port != 0 && port == "" {
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port = strconv.Itoa(i.Port)
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}
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lb.Servers[0].Port = ""
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if port == "" {
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return errors.New("port is missing")
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}
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if i.Address == "" {
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return errors.New("address is missing")
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}
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scheme := lb.Servers[0].Scheme
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lb.Servers[0].Scheme = ""
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lb.Servers[0].URL = fmt.Sprintf("%s://%s", scheme, net.JoinHostPort(i.Address, port))
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return nil
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}
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