localstore.go

/*
Copyright 2017 Tuenti Technologies S.L. All rights reserved.

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 main

import (
	"fmt"
	"sync"

	"k8s.io/apimachinery/pkg/api/meta"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/pkg/api/v1"
)

type Store interface {
	Delete(runtime.Object) runtime.Object
	Update(runtime.Object) runtime.Object
	Equal(runtime.Object, runtime.Object) (bool, error)
}

type LocalStore struct {
	sync.RWMutex

	Objects map[string]runtime.Object
}

func NewLocalStore() *LocalStore {
	return &LocalStore{
		Objects: make(map[string]runtime.Object),
	}
}

func (s *LocalStore) Equal(o runtime.Object, n runtime.Object) (bool, error) {
	return EqualResourceVersions(o, n)
}

func (s *LocalStore) Update(o runtime.Object) runtime.Object {
	s.Lock()
	defer s.Unlock()

	accessor, _ := meta.Accessor(o)
	link := accessor.GetSelfLink()
	old := s.Objects[link]
	s.Objects[link] = o
	return old
}

func (s *LocalStore) Delete(o runtime.Object) runtime.Object {
	s.Lock()
	defer s.Unlock()

	accessor, _ := meta.Accessor(o)
	link := accessor.GetSelfLink()
	old := s.Objects[link]
	delete(s.Objects, link)
	return old
}

type NodeStore struct {
	*LocalStore
}

func (s NodeStore) Equal(o runtime.Object, n runtime.Object) (bool, error) {
	// Not completelly accurate, but by now we are only using node names
	return EqualNames(o, n)
}

func (s *NodeStore) GetNames() []string {
	s.RLock()
	defer s.RUnlock()

	var nodeNames []string
	for _, o := range s.Objects {
		accessor, _ := meta.Accessor(o)
		nodeNames = append(nodeNames, accessor.GetName())
	}
	return nodeNames
}

type ServiceStore struct {
	*LocalStore
}

func (s *ServiceStore) List() ([]*v1.Service, error) {
	s.RLock()
	defer s.RUnlock()

	var services []*v1.Service
	for _, o := range s.Objects {
		service, ok := o.(*v1.Service)
		if !ok {
			return nil, fmt.Errorf("couldn't convert service")
		}
		services = append(services, service)
	}
	return services, nil
}

type EndpointsStore struct {
	*LocalStore
}

func (s EndpointsStore) Equal(o runtime.Object, n runtime.Object) (bool, error) {
	return EqualEndpoints(o, n)
}

func (s *EndpointsStore) List() ([]*v1.Endpoints, error) {
	s.RLock()
	defer s.RUnlock()

	var endpoints []*v1.Endpoints
	for _, o := range s.Objects {
		endpoint, ok := o.(*v1.Endpoints)
		if !ok {
			return nil, fmt.Errorf("couldn't convert endpoints")
		}
		endpoints = append(endpoints, endpoint)
	}
	return endpoints, nil
}