traefik/pkg/provider/configuration.go
Ludovic Fernandez f1b085fa36 Move code to pkg
2019-03-15 09:42:03 +01:00

193 lines
6 KiB
Go

package provider
import (
"bytes"
"context"
"reflect"
"sort"
"strings"
"text/template"
"unicode"
"github.com/Masterminds/sprig"
"github.com/containous/traefik/pkg/config"
"github.com/containous/traefik/pkg/log"
)
// Merge Merges multiple configurations.
func Merge(ctx context.Context, configurations map[string]*config.Configuration) *config.Configuration {
logger := log.FromContext(ctx)
configuration := &config.Configuration{
HTTP: &config.HTTPConfiguration{
Routers: make(map[string]*config.Router),
Middlewares: make(map[string]*config.Middleware),
Services: make(map[string]*config.Service),
},
TCP: &config.TCPConfiguration{
Routers: make(map[string]*config.TCPRouter),
Services: make(map[string]*config.TCPService),
},
}
servicesToDelete := map[string]struct{}{}
services := map[string][]string{}
routersToDelete := map[string]struct{}{}
routers := map[string][]string{}
middlewaresToDelete := map[string]struct{}{}
middlewares := 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 middlewareName, middleware := range conf.HTTP.Middlewares {
middlewares[middlewareName] = append(middlewares[middlewareName], root)
if !AddMiddleware(configuration.HTTP, middlewareName, middleware) {
middlewaresToDelete[middlewareName] = 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 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)
}
return configuration
}
// AddService Adds a service to a configurations.
func AddService(configuration *config.HTTPConfiguration, serviceName string, service *config.Service) bool {
if _, ok := configuration.Services[serviceName]; !ok {
configuration.Services[serviceName] = service
return true
}
if !configuration.Services[serviceName].LoadBalancer.Mergeable(service.LoadBalancer) {
return false
}
configuration.Services[serviceName].LoadBalancer.Servers = append(configuration.Services[serviceName].LoadBalancer.Servers, service.LoadBalancer.Servers...)
return true
}
// AddRouter Adds a router to a configurations.
func AddRouter(configuration *config.HTTPConfiguration, routerName string, router *config.Router) bool {
if _, ok := configuration.Routers[routerName]; !ok {
configuration.Routers[routerName] = router
return true
}
return reflect.DeepEqual(configuration.Routers[routerName], router)
}
// AddMiddleware Adds a middleware to a configurations.
func AddMiddleware(configuration *config.HTTPConfiguration, middlewareName string, middleware *config.Middleware) bool {
if _, ok := configuration.Middlewares[middlewareName]; !ok {
configuration.Middlewares[middlewareName] = middleware
return true
}
return reflect.DeepEqual(configuration.Middlewares[middlewareName], middleware)
}
// 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)
}
// BuildRouterConfiguration Builds a router configuration.
func BuildRouterConfiguration(ctx context.Context, configuration *config.HTTPConfiguration, defaultRouterName string, defaultRuleTpl *template.Template, model interface{}) {
logger := log.FromContext(ctx)
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]*config.Router)
configuration.Routers[defaultRouterName] = &config.Router{}
}
}
for routerName, router := range configuration.Routers {
loggerRouter := logger.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
}
}
if len(router.Service) == 0 {
if len(configuration.Services) > 1 {
delete(configuration.Routers, routerName)
loggerRouter.
Error("Could not define the service name for the router: too many services")
continue
}
for serviceName := range configuration.Services {
router.Service = serviceName
}
}
}
}
// Normalize Replace 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), "-")
}