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boltBackend.go
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boltBackend.go
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package main
import (
"bytes"
"encoding/binary"
"encoding/json"
"github.com/boltdb/bolt"
"github.com/capgemini/terraform-control/persistence"
"io"
"os"
"path/filepath"
)
var (
boltEnvironmentsBucket = []byte("environments")
boltBlobBucket = []byte("blob")
boltBuckets = [][]byte{
boltEnvironmentsBucket,
boltBlobBucket,
}
)
var (
boltDataVersion byte = 1
)
// BoltBackend - directory where data will be written. This directory will be
// created if it doesn't exist.
type BoltBackend struct {
Dir string
}
// GetBlob Function to persist in bolt
func (b *BoltBackend) GetBlob(k string) (*persistence.BlobData, error) {
db, err := b.db()
if err != nil {
return nil, err
}
defer db.Close()
var data []byte
err = db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket(boltBlobBucket)
data = bucket.Get([]byte(k))
return nil
})
if err != nil {
return nil, err
}
if data == nil {
return nil, nil
}
// We have to copy the data since it isn't valid once we close the DB
data = append([]byte{}, data...)
return &persistence.BlobData{
Key: k,
Data: bytes.NewReader(data),
}, nil
}
// PutBlob function to persist data and update bucket
func (b *BoltBackend) PutBlob(k string, d *persistence.BlobData) error {
db, err := b.db()
if err != nil {
return err
}
defer db.Close()
var buf bytes.Buffer
if _, err := io.Copy(&buf, d.Data); err != nil {
return err
}
return db.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket(boltBlobBucket)
return bucket.Put([]byte(k), buf.Bytes())
})
}
// GetAllEnvironments returns all environments persisted in bolt
func (b *BoltBackend) GetAllEnvironments() ([]*Environment, error) {
db, err := b.db()
if err != nil {
return nil, err
}
defer db.Close()
var result []*Environment
var env *Environment
err = db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket(boltEnvironmentsBucket).Bucket([]byte(
boltEnvironmentsBucket))
// If the bucket doesn't exist, we haven't written this yet
if bucket == nil {
return nil
}
c := bucket.Cursor()
count := 0
for k, v := c.First(); k != nil; k, v = c.Next() {
//fmt.Printf("key=%s, value=%s\n", k, v)
env = &Environment{}
err := b.structRead(env, v)
if err != nil {
return err
}
result = append(result, env)
count = count + 1
}
return nil
})
if err != nil {
return nil, err
}
return result, nil
}
// GetEnvironment returns environment specific details stored
func (b *BoltBackend) GetEnvironment(id int) (*Environment, error) {
db, err := b.db()
if err != nil {
return nil, err
}
defer db.Close()
var result *Environment
err = db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket(boltEnvironmentsBucket).Bucket([]byte(
boltEnvironmentsBucket))
// If the bucket doesn't exist, we haven't written this yet
if bucket == nil {
return nil
}
// Get the key for this infra
data := bucket.Get([]byte(itob(id)))
if data == nil {
return nil
}
result = &Environment{}
return b.structRead(result, data)
})
if err != nil {
return nil, err
}
return result, nil
}
// PutEnvironment adds or changes details for existing environment
func (b *BoltBackend) PutEnvironment(environment *Environment) error {
db, err := b.db()
if err != nil {
return err
}
defer db.Close()
return db.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket(boltEnvironmentsBucket)
bucket, err = bucket.CreateBucketIfNotExists([]byte(
boltEnvironmentsBucket))
if err != nil {
return err
}
if environment.ID == 0 {
id, _ := bucket.NextSequence()
environment.ID = int(id)
}
data, err := b.structData(environment)
if err != nil {
return err
}
return bucket.Put(itob(environment.ID), data)
})
}
// itob does some maths function
func itob(v int) []byte {
b := make([]byte, 8)
binary.BigEndian.PutUint64(b, uint64(v))
return b
}
// db returns the database handle, and sets up the DB if it has never
// been created.
func (b *BoltBackend) db() (*bolt.DB, error) {
// Make the directory to store our DB
if err := os.MkdirAll(b.Dir, 0755); err != nil {
return nil, err
}
// Create/Open the DB
db, err := bolt.Open(filepath.Join(b.Dir, "environments.db"), 0644, nil)
if err != nil {
return nil, err
}
// Create the buckets
err = db.Update(func(tx *bolt.Tx) error {
for _, b := range boltBuckets {
if _, err := tx.CreateBucketIfNotExists(b); err != nil {
return err
}
}
return nil
})
if err != nil {
return nil, err
}
return db, nil
}
func (b *BoltBackend) structData(d interface{}) ([]byte, error) {
// Let's just output it in human-readable format to make it easy
// for debugging. Disk space won't matter that much for this data.
return json.MarshalIndent(d, "", "\t")
}
func (b *BoltBackend) structRead(d interface{}, raw []byte) error {
dec := json.NewDecoder(bytes.NewReader(raw))
return dec.Decode(d)
}