traefik/pkg/provider/consulcatalog/config.go
2019-10-15 17:34:08 +02:00

200 lines
4.8 KiB
Go

package consulcatalog
import (
"context"
"errors"
"fmt"
"net"
"github.com/containous/traefik/v2/pkg/config/dynamic"
"github.com/containous/traefik/v2/pkg/config/label"
"github.com/containous/traefik/v2/pkg/log"
"github.com/containous/traefik/v2/pkg/provider"
"github.com/containous/traefik/v2/pkg/provider/constraints"
"github.com/hashicorp/consul/api"
)
func (p *Provider) buildConfiguration(ctx context.Context, items []itemData) *dynamic.Configuration {
configurations := make(map[string]*dynamic.Configuration)
for _, item := range items {
svcName := item.Name + "-" + item.ID
ctxSvc := log.With(ctx, log.Str("serviceName", svcName))
if !p.keepContainer(ctxSvc, item) {
continue
}
logger := log.FromContext(ctxSvc)
confFromLabel, err := label.DecodeConfiguration(item.Labels)
if err != nil {
logger.Error(err)
continue
}
if len(confFromLabel.TCP.Routers) > 0 || len(confFromLabel.TCP.Services) > 0 {
err := p.buildTCPServiceConfiguration(ctxSvc, item, confFromLabel.TCP)
if err != nil {
logger.Error(err)
continue
}
provider.BuildTCPRouterConfiguration(ctxSvc, confFromLabel.TCP)
if len(confFromLabel.HTTP.Routers) == 0 &&
len(confFromLabel.HTTP.Middlewares) == 0 &&
len(confFromLabel.HTTP.Services) == 0 {
configurations[svcName] = confFromLabel
continue
}
}
err = p.buildServiceConfiguration(ctxSvc, item, confFromLabel.HTTP)
if err != nil {
logger.Error(err)
continue
}
model := struct {
Name string
Labels map[string]string
}{
Name: item.Name,
Labels: item.Labels,
}
provider.BuildRouterConfiguration(ctx, confFromLabel.HTTP, item.Name, p.defaultRuleTpl, model)
configurations[svcName] = confFromLabel
}
return provider.Merge(ctx, configurations)
}
func (p *Provider) keepContainer(ctx context.Context, item itemData) bool {
logger := log.FromContext(ctx)
if !item.ExtraConf.Enable {
logger.Debug("Filtering disabled item")
return false
}
matches, err := constraints.Match(item.Labels, p.Constraints)
if err != nil {
logger.Errorf("Error matching constraints expression: %v", err)
return false
}
if !matches {
logger.Debugf("Container pruned by constraint expression: %q", p.Constraints)
return false
}
if item.Status != api.HealthPassing && item.Status != api.HealthWarning {
logger.Debug("Filtering unhealthy or starting item")
return false
}
return true
}
func (p *Provider) buildTCPServiceConfiguration(ctx context.Context, item itemData, configuration *dynamic.TCPConfiguration) error {
if len(configuration.Services) == 0 {
configuration.Services = make(map[string]*dynamic.TCPService)
lb := &dynamic.TCPServersLoadBalancer{}
lb.SetDefaults()
configuration.Services[item.Name] = &dynamic.TCPService{
LoadBalancer: lb,
}
}
for name, service := range configuration.Services {
ctxSvc := log.With(ctx, log.Str(log.ServiceName, name))
err := p.addServerTCP(ctxSvc, item, service.LoadBalancer)
if err != nil {
return err
}
}
return nil
}
func (p *Provider) buildServiceConfiguration(ctx context.Context, item itemData, configuration *dynamic.HTTPConfiguration) error {
if len(configuration.Services) == 0 {
configuration.Services = make(map[string]*dynamic.Service)
lb := &dynamic.ServersLoadBalancer{}
lb.SetDefaults()
configuration.Services[item.Name] = &dynamic.Service{
LoadBalancer: lb,
}
}
for name, service := range configuration.Services {
ctxSvc := log.With(ctx, log.Str(log.ServiceName, name))
err := p.addServer(ctxSvc, item, service.LoadBalancer)
if err != nil {
return err
}
}
return nil
}
func (p *Provider) addServerTCP(ctx context.Context, item itemData, loadBalancer *dynamic.TCPServersLoadBalancer) error {
if loadBalancer == nil {
return errors.New("load-balancer is not defined")
}
if len(loadBalancer.Servers) == 0 {
loadBalancer.Servers = []dynamic.TCPServer{{}}
}
var port string
if item.Port != "" {
port = item.Port
loadBalancer.Servers[0].Port = ""
}
if port == "" {
return errors.New("port is missing")
}
loadBalancer.Servers[0].Address = net.JoinHostPort(item.Address, port)
return nil
}
func (p *Provider) addServer(ctx context.Context, item itemData, loadBalancer *dynamic.ServersLoadBalancer) error {
if loadBalancer == nil {
return errors.New("load-balancer is not defined")
}
var port string
if len(loadBalancer.Servers) > 0 {
port = loadBalancer.Servers[0].Port
}
if len(loadBalancer.Servers) == 0 {
server := dynamic.Server{}
server.SetDefaults()
loadBalancer.Servers = []dynamic.Server{server}
}
if item.Port != "" {
port = item.Port
loadBalancer.Servers[0].Port = ""
}
if port == "" {
return errors.New("port is missing")
}
loadBalancer.Servers[0].URL = fmt.Sprintf("%s://%s", loadBalancer.Servers[0].Scheme, net.JoinHostPort(item.Address, port))
loadBalancer.Servers[0].Scheme = ""
return nil
}