traefik/pkg/provider/nomad/config.go

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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")
}
if len(lb.Servers) == 0 {
lb.Servers = []dynamic.TCPServer{{}}
}
if i.Address == "" {
return errors.New("address is missing")
}
port := lb.Servers[0].Port
lb.Servers[0].Port = ""
if port == "" && i.Port > 0 {
port = strconv.Itoa(i.Port)
}
if port == "" {
return errors.New("port 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")
}
if len(lb.Servers) == 0 {
lb.Servers = []dynamic.UDPServer{{}}
}
if i.Address == "" {
return errors.New("address is missing")
}
port := lb.Servers[0].Port
lb.Servers[0].Port = ""
if port == "" && i.Port > 0 {
port = strconv.Itoa(i.Port)
}
if port == "" {
return errors.New("port 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")
}
if len(lb.Servers) == 0 {
server := dynamic.Server{}
server.SetDefaults()
lb.Servers = []dynamic.Server{server}
}
if i.Address == "" {
return errors.New("address is missing")
}
port := lb.Servers[0].Port
lb.Servers[0].Port = ""
if port == "" && i.Port > 0 {
port = strconv.Itoa(i.Port)
}
if port == "" {
return errors.New("port 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()))
}