main.go

/*
Copyright (c) 2016, UPMC Enterprises
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name UPMC Enterprises nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL UPMC ENTERPRISES BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PR)
OCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
*/

/*
    Changes
    2016-09-12: Lachlan Evenson - Add TPR creation PR 11
*/

package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	_ "net/http/pprof"
	"os"
	"os/signal"
	"path"
	"sync"
	"syscall"

	"github.com/boltdb/bolt"
)

var (
	dataDir          = "/var/lib/vault-manager"
	vaultToken       = ""
	vaultURL         = "http://127.0.0.1:8200"
	syncIntervalSecs = 5
	vltClient        *vaultClient
	tpr_name 	 = "customsecrets.enterprises.upmc.com"
	tpr_description  = "Secret which allows for secret creation of MySQL users"
	tpr_version      = "v1"
)

func main() {
	flag.StringVar(&dataDir, "data-dir", dataDir, "Data directory path.")
	flag.StringVar(&vaultToken, "vault-token", vaultToken, "Token to access vault.")
	flag.StringVar(&vaultURL, "vault-url", vaultURL, "URL to access vault.")
	flag.IntVar(&syncIntervalSecs, "sync-interval", syncIntervalSecs, "Sync interval in seconds.")
	flag.Parse()

	log.Println("Starting Kubernetes Vault Controller...")

	go func() {
		log.Println(http.ListenAndServe("127.0.0.1:6060", nil))
	}()

	db, err := bolt.Open(path.Join(dataDir, "data.db"), 0600, nil)
	if err != nil {
		log.Fatal(err)
	}

	err = db.Update(func(tx *bolt.Tx) error {
		_, err = tx.CreateBucketIfNotExists([]byte("Secrets"))
		if err != nil {
			return fmt.Errorf("create bucket: %s", err)
		}
		return nil
	})
	if err != nil {
		log.Fatal(err)
	}

	// Create ThirdPartyResource
	err = createKubernetesThirdPartyResource(tpr_name, tpr_description, tpr_version)
	if err != nil {
		log.Println(err)
	}

	// Init vault client
	vltClient, err = newVaultClient(vaultToken, vaultURL)

	if err != nil {
		log.Println("Could not create Vault Client! ", err)
	}

	log.Println("Kubernetes Vault Controller started successfully.")

	// Process all Certificates definitions during the startup process.
	err = syncCustomSecrets(db)
	if err != nil {
		log.Println(err)
	}

	doneChan := make(chan struct{})
	var wg sync.WaitGroup

	// Watch for events that add, modify, or delete CustomSecret definitions and
	// process them asynchronously.
	log.Println("Watching for custom secret events.")
	wg.Add(1)
	watchCustomSecretsEvents(db, doneChan, &wg)

	// Start the custom secret reconciler that will ensure all Custom Secret
	// definitions are implemented with a Vault secret and a Kubernetes secret.
	log.Println("Starting reconciliation loop.")
	wg.Add(1)
	reconcileCustomSecrets(syncIntervalSecs, db, doneChan, &wg)

	signalChan := make(chan os.Signal, 1)
	signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM)
	for {
		select {
		case <-signalChan:
			log.Printf("Shutdown signal received, exiting...")
			close(doneChan)
			wg.Wait()
			os.Exit(0)
		}
	}
}