gceurlmap.go

/*
Copyright 2017 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package utils

import (
	"fmt"

	compute "google.golang.org/api/compute/v1"
)

// GCEURLMap is a nested map of hostname->path regex->backend
type GCEURLMap map[string]map[string]*compute.BackendService

// GetDefaultBackend performs a destructive read and returns the default
// backend of the urlmap.
func (g GCEURLMap) GetDefaultBackend() *compute.BackendService {
	var d *compute.BackendService
	var exists bool
	if h, ok := g[DefaultBackendKey]; ok {
		if d, exists = h[DefaultBackendKey]; exists {
			delete(h, DefaultBackendKey)
		}
		delete(g, DefaultBackendKey)
	}
	return d
}

// String implements the string interface for the GCEURLMap.
func (g GCEURLMap) String() string {
	msg := ""
	for host, um := range g {
		msg += fmt.Sprintf("%v\n", host)
		for url, be := range um {
			msg += fmt.Sprintf("\t%v: ", url)
			if be == nil {
				msg += fmt.Sprintf("No backend\n")
			} else {
				msg += fmt.Sprintf("%v\n", be.Name)
			}
		}
	}
	return msg
}

// PutDefaultBackend performs a destructive write replacing the
// default backend of the url map with the given backend.
func (g GCEURLMap) PutDefaultBackend(d *compute.BackendService) {
	g[DefaultBackendKey] = map[string]*compute.BackendService{
		DefaultBackendKey: d,
	}
}