traefik/pkg/provider/configuration.go

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package provider
import (
"bytes"
"context"
"reflect"
"sort"
"strings"
"text/template"
"unicode"
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"github.com/Masterminds/sprig/v3"
"github.com/traefik/traefik/v2/pkg/config/dynamic"
"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/tls"
"golang.org/x/exp/maps"
)
// Merge merges multiple configurations.
func Merge(ctx context.Context, configurations map[string]*dynamic.Configuration) *dynamic.Configuration {
logger := log.FromContext(ctx)
configuration := &dynamic.Configuration{
HTTP: &dynamic.HTTPConfiguration{
Routers: make(map[string]*dynamic.Router),
Middlewares: make(map[string]*dynamic.Middleware),
Services: make(map[string]*dynamic.Service),
ServersTransports: make(map[string]*dynamic.ServersTransport),
},
TCP: &dynamic.TCPConfiguration{
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Routers: make(map[string]*dynamic.TCPRouter),
Services: make(map[string]*dynamic.TCPService),
Middlewares: make(map[string]*dynamic.TCPMiddleware),
},
UDP: &dynamic.UDPConfiguration{
Routers: make(map[string]*dynamic.UDPRouter),
Services: make(map[string]*dynamic.UDPService),
},
TLS: &dynamic.TLSConfiguration{
Stores: make(map[string]tls.Store),
},
}
servicesToDelete := map[string]struct{}{}
services := map[string][]string{}
routersToDelete := map[string]struct{}{}
routers := map[string][]string{}
servicesTCPToDelete := map[string]struct{}{}
servicesTCP := map[string][]string{}
routersTCPToDelete := map[string]struct{}{}
routersTCP := map[string][]string{}
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servicesUDPToDelete := map[string]struct{}{}
servicesUDP := map[string][]string{}
routersUDPToDelete := map[string]struct{}{}
routersUDP := map[string][]string{}
middlewaresToDelete := map[string]struct{}{}
middlewares := map[string][]string{}
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middlewaresTCPToDelete := map[string]struct{}{}
middlewaresTCP := map[string][]string{}
transportsToDelete := map[string]struct{}{}
transports := map[string][]string{}
storesToDelete := map[string]struct{}{}
stores := map[string][]string{}
var sortedKeys []string
for key := range configurations {
sortedKeys = append(sortedKeys, key)
}
sort.Strings(sortedKeys)
for _, root := range sortedKeys {
conf := configurations[root]
for serviceName, service := range conf.HTTP.Services {
services[serviceName] = append(services[serviceName], root)
if !AddService(configuration.HTTP, serviceName, service) {
servicesToDelete[serviceName] = struct{}{}
}
}
for routerName, router := range conf.HTTP.Routers {
routers[routerName] = append(routers[routerName], root)
if !AddRouter(configuration.HTTP, routerName, router) {
routersToDelete[routerName] = struct{}{}
}
}
for transportName, transport := range conf.HTTP.ServersTransports {
transports[transportName] = append(transports[transportName], root)
if !AddTransport(configuration.HTTP, transportName, transport) {
transportsToDelete[transportName] = struct{}{}
}
}
for serviceName, service := range conf.TCP.Services {
servicesTCP[serviceName] = append(servicesTCP[serviceName], root)
if !AddServiceTCP(configuration.TCP, serviceName, service) {
servicesTCPToDelete[serviceName] = struct{}{}
}
}
for routerName, router := range conf.TCP.Routers {
routersTCP[routerName] = append(routersTCP[routerName], root)
if !AddRouterTCP(configuration.TCP, routerName, router) {
routersTCPToDelete[routerName] = struct{}{}
}
}
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for serviceName, service := range conf.UDP.Services {
servicesUDP[serviceName] = append(servicesUDP[serviceName], root)
if !AddServiceUDP(configuration.UDP, serviceName, service) {
servicesUDPToDelete[serviceName] = struct{}{}
}
}
for routerName, router := range conf.UDP.Routers {
routersUDP[routerName] = append(routersUDP[routerName], root)
if !AddRouterUDP(configuration.UDP, routerName, router) {
routersUDPToDelete[routerName] = struct{}{}
}
}
for middlewareName, middleware := range conf.HTTP.Middlewares {
middlewares[middlewareName] = append(middlewares[middlewareName], root)
if !AddMiddleware(configuration.HTTP, middlewareName, middleware) {
middlewaresToDelete[middlewareName] = struct{}{}
}
}
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for middlewareName, middleware := range conf.TCP.Middlewares {
middlewaresTCP[middlewareName] = append(middlewaresTCP[middlewareName], root)
if !AddMiddlewareTCP(configuration.TCP, middlewareName, middleware) {
middlewaresTCPToDelete[middlewareName] = struct{}{}
}
}
for storeName, store := range conf.TLS.Stores {
stores[storeName] = append(stores[storeName], root)
if !AddStore(configuration.TLS, storeName, store) {
storesToDelete[storeName] = struct{}{}
}
}
}
for serviceName := range servicesToDelete {
logger.WithField(log.ServiceName, serviceName).
Errorf("Service defined multiple times with different configurations in %v", services[serviceName])
delete(configuration.HTTP.Services, serviceName)
}
for routerName := range routersToDelete {
logger.WithField(log.RouterName, routerName).
Errorf("Router defined multiple times with different configurations in %v", routers[routerName])
delete(configuration.HTTP.Routers, routerName)
}
for transportName := range transportsToDelete {
logger.WithField(log.ServersTransportName, transportName).
Errorf("ServersTransport defined multiple times with different configurations in %v", transports[transportName])
delete(configuration.HTTP.ServersTransports, transportName)
}
for serviceName := range servicesTCPToDelete {
logger.WithField(log.ServiceName, serviceName).
Errorf("Service TCP defined multiple times with different configurations in %v", servicesTCP[serviceName])
delete(configuration.TCP.Services, serviceName)
}
for routerName := range routersTCPToDelete {
logger.WithField(log.RouterName, routerName).
Errorf("Router TCP defined multiple times with different configurations in %v", routersTCP[routerName])
delete(configuration.TCP.Routers, routerName)
}
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for serviceName := range servicesUDPToDelete {
logger.WithField(log.ServiceName, serviceName).
Errorf("UDP service defined multiple times with different configurations in %v", servicesUDP[serviceName])
delete(configuration.UDP.Services, serviceName)
}
for routerName := range routersUDPToDelete {
logger.WithField(log.RouterName, routerName).
Errorf("UDP router defined multiple times with different configurations in %v", routersUDP[routerName])
delete(configuration.UDP.Routers, routerName)
}
for middlewareName := range middlewaresToDelete {
logger.WithField(log.MiddlewareName, middlewareName).
Errorf("Middleware defined multiple times with different configurations in %v", middlewares[middlewareName])
delete(configuration.HTTP.Middlewares, middlewareName)
}
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for middlewareName := range middlewaresTCPToDelete {
logger.WithField(log.MiddlewareName, middlewareName).
Errorf("TCP Middleware defined multiple times with different configurations in %v", middlewaresTCP[middlewareName])
delete(configuration.TCP.Middlewares, middlewareName)
}
for storeName := range storesToDelete {
logger.WithField("storeName", storeName).
Errorf("TLS store defined multiple times with different configurations in %v", stores[storeName])
delete(configuration.TLS.Stores, storeName)
}
return configuration
}
// AddServiceTCP adds a service to a configurations.
func AddServiceTCP(configuration *dynamic.TCPConfiguration, serviceName string, service *dynamic.TCPService) bool {
if _, ok := configuration.Services[serviceName]; !ok {
configuration.Services[serviceName] = service
return true
}
if !configuration.Services[serviceName].LoadBalancer.Mergeable(service.LoadBalancer) {
return false
}
uniq := map[string]struct{}{}
for _, server := range configuration.Services[serviceName].LoadBalancer.Servers {
uniq[server.Address] = struct{}{}
}
for _, server := range service.LoadBalancer.Servers {
if _, ok := uniq[server.Address]; !ok {
configuration.Services[serviceName].LoadBalancer.Servers = append(configuration.Services[serviceName].LoadBalancer.Servers, server)
}
}
return true
}
// AddRouterTCP adds a router to a configurations.
func AddRouterTCP(configuration *dynamic.TCPConfiguration, routerName string, router *dynamic.TCPRouter) bool {
if _, ok := configuration.Routers[routerName]; !ok {
configuration.Routers[routerName] = router
return true
}
return reflect.DeepEqual(configuration.Routers[routerName], router)
}
// AddMiddlewareTCP adds a middleware to a configurations.
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func AddMiddlewareTCP(configuration *dynamic.TCPConfiguration, middlewareName string, middleware *dynamic.TCPMiddleware) bool {
if _, ok := configuration.Middlewares[middlewareName]; !ok {
configuration.Middlewares[middlewareName] = middleware
return true
}
return reflect.DeepEqual(configuration.Middlewares[middlewareName], middleware)
}
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// AddServiceUDP adds a service to a configuration.
func AddServiceUDP(configuration *dynamic.UDPConfiguration, serviceName string, service *dynamic.UDPService) bool {
if _, ok := configuration.Services[serviceName]; !ok {
configuration.Services[serviceName] = service
return true
}
if !configuration.Services[serviceName].LoadBalancer.Mergeable(service.LoadBalancer) {
return false
}
uniq := map[string]struct{}{}
for _, server := range configuration.Services[serviceName].LoadBalancer.Servers {
uniq[server.Address] = struct{}{}
}
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for _, server := range service.LoadBalancer.Servers {
if _, ok := uniq[server.Address]; !ok {
configuration.Services[serviceName].LoadBalancer.Servers = append(configuration.Services[serviceName].LoadBalancer.Servers, server)
}
}
return true
}
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// AddRouterUDP adds a router to a configuration.
func AddRouterUDP(configuration *dynamic.UDPConfiguration, routerName string, router *dynamic.UDPRouter) bool {
if _, ok := configuration.Routers[routerName]; !ok {
configuration.Routers[routerName] = router
return true
}
return reflect.DeepEqual(configuration.Routers[routerName], router)
}
// AddService adds a service to a configurations.
func AddService(configuration *dynamic.HTTPConfiguration, serviceName string, service *dynamic.Service) bool {
if _, ok := configuration.Services[serviceName]; !ok {
configuration.Services[serviceName] = service
return true
}
if !configuration.Services[serviceName].LoadBalancer.Mergeable(service.LoadBalancer) {
return false
}
uniq := map[string]struct{}{}
for _, server := range configuration.Services[serviceName].LoadBalancer.Servers {
uniq[server.URL] = struct{}{}
}
for _, server := range service.LoadBalancer.Servers {
if _, ok := uniq[server.URL]; !ok {
configuration.Services[serviceName].LoadBalancer.Servers = append(configuration.Services[serviceName].LoadBalancer.Servers, server)
}
}
return true
}
// AddRouter adds a router to a configurations.
func AddRouter(configuration *dynamic.HTTPConfiguration, routerName string, router *dynamic.Router) bool {
if _, ok := configuration.Routers[routerName]; !ok {
configuration.Routers[routerName] = router
return true
}
return reflect.DeepEqual(configuration.Routers[routerName], router)
}
// AddTransport adds a transport to a configurations.
func AddTransport(configuration *dynamic.HTTPConfiguration, transportName string, transport *dynamic.ServersTransport) bool {
if _, ok := configuration.ServersTransports[transportName]; !ok {
configuration.ServersTransports[transportName] = transport
return true
}
return reflect.DeepEqual(configuration.ServersTransports[transportName], transport)
}
// AddMiddleware adds a middleware to a configurations.
func AddMiddleware(configuration *dynamic.HTTPConfiguration, middlewareName string, middleware *dynamic.Middleware) bool {
if _, ok := configuration.Middlewares[middlewareName]; !ok {
configuration.Middlewares[middlewareName] = middleware
return true
}
return reflect.DeepEqual(configuration.Middlewares[middlewareName], middleware)
}
// AddStore adds a middleware to a configurations.
func AddStore(configuration *dynamic.TLSConfiguration, storeName string, store tls.Store) bool {
if _, ok := configuration.Stores[storeName]; !ok {
configuration.Stores[storeName] = store
return true
}
return reflect.DeepEqual(configuration.Stores[storeName], store)
}
// MakeDefaultRuleTemplate creates the default rule template.
func MakeDefaultRuleTemplate(defaultRule string, funcMap template.FuncMap) (*template.Template, error) {
defaultFuncMap := sprig.TxtFuncMap()
defaultFuncMap["normalize"] = Normalize
for k, fn := range funcMap {
defaultFuncMap[k] = fn
}
return template.New("defaultRule").Funcs(defaultFuncMap).Parse(defaultRule)
}
// BuildTCPRouterConfiguration builds a router configuration.
func BuildTCPRouterConfiguration(ctx context.Context, configuration *dynamic.TCPConfiguration) {
for routerName, router := range configuration.Routers {
loggerRouter := log.FromContext(ctx).WithField(log.RouterName, routerName)
if len(router.Rule) == 0 {
delete(configuration.Routers, routerName)
loggerRouter.Errorf("Empty rule")
continue
}
if router.Service == "" {
if len(configuration.Services) > 1 {
delete(configuration.Routers, routerName)
loggerRouter.
Errorf("Router %s cannot be linked automatically with multiple Services: %q", routerName, maps.Keys(configuration.Services))
continue
}
for serviceName := range configuration.Services {
router.Service = serviceName
}
}
}
}
// BuildUDPRouterConfiguration builds a router configuration.
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func BuildUDPRouterConfiguration(ctx context.Context, configuration *dynamic.UDPConfiguration) {
for routerName, router := range configuration.Routers {
loggerRouter := log.FromContext(ctx).WithField(log.RouterName, routerName)
if router.Service != "" {
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continue
}
if len(configuration.Services) > 1 {
delete(configuration.Routers, routerName)
loggerRouter.
Errorf("Router %s cannot be linked automatically with multiple Services: %q", routerName, maps.Keys(configuration.Services))
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continue
}
for serviceName := range configuration.Services {
router.Service = serviceName
break
}
}
}
// BuildRouterConfiguration builds a router configuration.
func BuildRouterConfiguration(ctx context.Context, configuration *dynamic.HTTPConfiguration, defaultRouterName string, defaultRuleTpl *template.Template, model interface{}) {
if len(configuration.Routers) == 0 {
if len(configuration.Services) > 1 {
log.FromContext(ctx).Info("Could not create a router for the container: too many services")
} else {
configuration.Routers = make(map[string]*dynamic.Router)
configuration.Routers[defaultRouterName] = &dynamic.Router{}
}
}
for routerName, router := range configuration.Routers {
loggerRouter := log.FromContext(ctx).WithField(log.RouterName, routerName)
if len(router.Rule) == 0 {
writer := &bytes.Buffer{}
if err := defaultRuleTpl.Execute(writer, model); err != nil {
loggerRouter.Errorf("Error while parsing default rule: %v", err)
delete(configuration.Routers, routerName)
continue
}
router.Rule = writer.String()
if len(router.Rule) == 0 {
loggerRouter.Error("Undefined rule")
delete(configuration.Routers, routerName)
continue
}
// Flag default rule routers to add the denyRouterRecursion middleware.
router.DefaultRule = true
}
if router.Service == "" {
if len(configuration.Services) > 1 {
delete(configuration.Routers, routerName)
loggerRouter.
Errorf("Router %s cannot be linked automatically with multiple Services: %q", routerName, maps.Keys(configuration.Services))
continue
}
for serviceName := range configuration.Services {
router.Service = serviceName
}
}
}
}
// Normalize replaces all special chars with `-`.
func Normalize(name string) string {
fargs := func(c rune) bool {
return !unicode.IsLetter(c) && !unicode.IsNumber(c)
}
// get function
return strings.Join(strings.FieldsFunc(name, fargs), "-")
}