274 lines
8.8 KiB
Go
274 lines
8.8 KiB
Go
package provider
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import (
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"bytes"
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"context"
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"reflect"
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"sort"
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"strings"
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"text/template"
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"unicode"
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"github.com/Masterminds/sprig"
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"github.com/containous/traefik/v2/pkg/config/dynamic"
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"github.com/containous/traefik/v2/pkg/log"
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)
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// Merge Merges multiple configurations.
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func Merge(ctx context.Context, configurations map[string]*dynamic.Configuration) *dynamic.Configuration {
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logger := log.FromContext(ctx)
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configuration := &dynamic.Configuration{
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HTTP: &dynamic.HTTPConfiguration{
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Routers: make(map[string]*dynamic.Router),
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Middlewares: make(map[string]*dynamic.Middleware),
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Services: make(map[string]*dynamic.Service),
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},
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TCP: &dynamic.TCPConfiguration{
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Routers: make(map[string]*dynamic.TCPRouter),
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Services: make(map[string]*dynamic.TCPService),
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},
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}
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servicesToDelete := map[string]struct{}{}
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services := map[string][]string{}
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routersToDelete := map[string]struct{}{}
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routers := map[string][]string{}
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servicesTCPToDelete := map[string]struct{}{}
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servicesTCP := map[string][]string{}
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routersTCPToDelete := map[string]struct{}{}
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routersTCP := map[string][]string{}
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middlewaresToDelete := map[string]struct{}{}
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middlewares := map[string][]string{}
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var sortedKeys []string
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for key := range configurations {
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sortedKeys = append(sortedKeys, key)
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}
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sort.Strings(sortedKeys)
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for _, root := range sortedKeys {
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conf := configurations[root]
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for serviceName, service := range conf.HTTP.Services {
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services[serviceName] = append(services[serviceName], root)
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if !AddService(configuration.HTTP, serviceName, service) {
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servicesToDelete[serviceName] = struct{}{}
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}
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}
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for routerName, router := range conf.HTTP.Routers {
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routers[routerName] = append(routers[routerName], root)
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if !AddRouter(configuration.HTTP, routerName, router) {
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routersToDelete[routerName] = struct{}{}
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}
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}
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for serviceName, service := range conf.TCP.Services {
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servicesTCP[serviceName] = append(servicesTCP[serviceName], root)
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if !AddServiceTCP(configuration.TCP, serviceName, service) {
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servicesTCPToDelete[serviceName] = struct{}{}
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}
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}
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for routerName, router := range conf.TCP.Routers {
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routersTCP[routerName] = append(routersTCP[routerName], root)
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if !AddRouterTCP(configuration.TCP, routerName, router) {
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routersTCPToDelete[routerName] = struct{}{}
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}
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}
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for middlewareName, middleware := range conf.HTTP.Middlewares {
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middlewares[middlewareName] = append(middlewares[middlewareName], root)
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if !AddMiddleware(configuration.HTTP, middlewareName, middleware) {
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middlewaresToDelete[middlewareName] = struct{}{}
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}
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}
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}
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for serviceName := range servicesToDelete {
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logger.WithField(log.ServiceName, serviceName).
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Errorf("Service defined multiple times with different configurations in %v", services[serviceName])
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delete(configuration.HTTP.Services, serviceName)
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}
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for routerName := range routersToDelete {
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logger.WithField(log.RouterName, routerName).
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Errorf("Router defined multiple times with different configurations in %v", routers[routerName])
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delete(configuration.HTTP.Routers, routerName)
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}
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for serviceName := range servicesTCPToDelete {
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logger.WithField(log.ServiceName, serviceName).
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Errorf("Service TCP defined multiple times with different configurations in %v", servicesTCP[serviceName])
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delete(configuration.TCP.Services, serviceName)
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}
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for routerName := range routersTCPToDelete {
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logger.WithField(log.RouterName, routerName).
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Errorf("Router TCP defined multiple times with different configurations in %v", routersTCP[routerName])
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delete(configuration.TCP.Routers, routerName)
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}
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for middlewareName := range middlewaresToDelete {
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logger.WithField(log.MiddlewareName, middlewareName).
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Errorf("Middleware defined multiple times with different configurations in %v", middlewares[middlewareName])
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delete(configuration.HTTP.Middlewares, middlewareName)
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}
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return configuration
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}
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// AddServiceTCP Adds a service to a configurations.
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func AddServiceTCP(configuration *dynamic.TCPConfiguration, serviceName string, service *dynamic.TCPService) bool {
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if _, ok := configuration.Services[serviceName]; !ok {
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configuration.Services[serviceName] = service
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return true
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}
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if !configuration.Services[serviceName].LoadBalancer.Mergeable(service.LoadBalancer) {
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return false
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}
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configuration.Services[serviceName].LoadBalancer.Servers = append(configuration.Services[serviceName].LoadBalancer.Servers, service.LoadBalancer.Servers...)
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return true
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}
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// AddRouterTCP Adds a router to a configurations.
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func AddRouterTCP(configuration *dynamic.TCPConfiguration, routerName string, router *dynamic.TCPRouter) bool {
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if _, ok := configuration.Routers[routerName]; !ok {
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configuration.Routers[routerName] = router
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return true
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}
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return reflect.DeepEqual(configuration.Routers[routerName], router)
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}
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// AddService Adds a service to a configurations.
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func AddService(configuration *dynamic.HTTPConfiguration, serviceName string, service *dynamic.Service) bool {
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if _, ok := configuration.Services[serviceName]; !ok {
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configuration.Services[serviceName] = service
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return true
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}
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if !configuration.Services[serviceName].LoadBalancer.Mergeable(service.LoadBalancer) {
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return false
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}
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configuration.Services[serviceName].LoadBalancer.Servers = append(configuration.Services[serviceName].LoadBalancer.Servers, service.LoadBalancer.Servers...)
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return true
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}
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// AddRouter Adds a router to a configurations.
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func AddRouter(configuration *dynamic.HTTPConfiguration, routerName string, router *dynamic.Router) bool {
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if _, ok := configuration.Routers[routerName]; !ok {
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configuration.Routers[routerName] = router
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return true
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}
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return reflect.DeepEqual(configuration.Routers[routerName], router)
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}
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// AddMiddleware Adds a middleware to a configurations.
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func AddMiddleware(configuration *dynamic.HTTPConfiguration, middlewareName string, middleware *dynamic.Middleware) bool {
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if _, ok := configuration.Middlewares[middlewareName]; !ok {
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configuration.Middlewares[middlewareName] = middleware
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return true
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}
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return reflect.DeepEqual(configuration.Middlewares[middlewareName], middleware)
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}
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// MakeDefaultRuleTemplate Creates the default rule template.
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func MakeDefaultRuleTemplate(defaultRule string, funcMap template.FuncMap) (*template.Template, error) {
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defaultFuncMap := sprig.TxtFuncMap()
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defaultFuncMap["normalize"] = Normalize
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for k, fn := range funcMap {
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defaultFuncMap[k] = fn
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}
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return template.New("defaultRule").Funcs(defaultFuncMap).Parse(defaultRule)
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}
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// BuildTCPRouterConfiguration Builds a router configuration.
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func BuildTCPRouterConfiguration(ctx context.Context, configuration *dynamic.TCPConfiguration) {
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for routerName, router := range configuration.Routers {
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loggerRouter := log.FromContext(ctx).WithField(log.RouterName, routerName)
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if len(router.Rule) == 0 {
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delete(configuration.Routers, routerName)
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loggerRouter.Errorf("Empty rule")
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continue
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}
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if len(router.Service) == 0 {
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if len(configuration.Services) > 1 {
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delete(configuration.Routers, routerName)
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loggerRouter.
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Error("Could not define the service name for the router: too many services")
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continue
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}
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for serviceName := range configuration.Services {
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router.Service = serviceName
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}
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}
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}
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}
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// BuildRouterConfiguration Builds a router configuration.
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func BuildRouterConfiguration(ctx context.Context, configuration *dynamic.HTTPConfiguration, defaultRouterName string, defaultRuleTpl *template.Template, model interface{}) {
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if len(configuration.Routers) == 0 {
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if len(configuration.Services) > 1 {
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log.FromContext(ctx).Info("Could not create a router for the container: too many services")
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} else {
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configuration.Routers = make(map[string]*dynamic.Router)
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configuration.Routers[defaultRouterName] = &dynamic.Router{}
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}
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}
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for routerName, router := range configuration.Routers {
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loggerRouter := log.FromContext(ctx).WithField(log.RouterName, routerName)
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if len(router.Rule) == 0 {
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writer := &bytes.Buffer{}
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if err := defaultRuleTpl.Execute(writer, model); err != nil {
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loggerRouter.Errorf("Error while parsing default rule: %v", err)
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delete(configuration.Routers, routerName)
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continue
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}
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router.Rule = writer.String()
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if len(router.Rule) == 0 {
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loggerRouter.Error("Undefined rule")
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delete(configuration.Routers, routerName)
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continue
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}
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}
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if len(router.Service) == 0 {
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if len(configuration.Services) > 1 {
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delete(configuration.Routers, routerName)
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loggerRouter.
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Error("Could not define the service name for the router: too many services")
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continue
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}
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for serviceName := range configuration.Services {
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router.Service = serviceName
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}
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}
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}
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}
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// Normalize Replace all special chars with `-`.
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func Normalize(name string) string {
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fargs := func(c rune) bool {
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return !unicode.IsLetter(c) && !unicode.IsNumber(c)
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}
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// get function
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return strings.Join(strings.FieldsFunc(name, fargs), "-")
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}
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