/
bolt.go
386 lines (353 loc) · 8.34 KB
/
bolt.go
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package db
import (
"bytes"
"encoding/gob"
"sort"
"strconv"
"github.com/boltdb/bolt"
"github.com/echlebek/erickson/review"
)
type BoltDB struct {
*bolt.DB
}
type metaData struct {
Summaries map[string]review.Summary `json:"summaries"`
}
var (
_ Database = &BoltDB{}
rootKey = []byte("erickson")
metaKey = []byte("metadata")
reviewsKey = []byte("reviews")
revisionsKey = []byte("revisions")
summaryKey = []byte("summary")
usersKey = []byte("users")
)
func getReviewsBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
root := tx.Bucket(rootKey)
if root == nil {
return nil, ErrNoDB
}
reviews := root.Bucket(reviewsKey)
if reviews == nil {
return nil, ErrNoDB
}
return reviews, nil
}
func getReviewBucket(tx *bolt.Tx, id int) (*bolt.Bucket, error) {
reviewsBkt, err := getReviewsBucket(tx)
if err != nil {
return nil, err
}
bucket := reviewsBkt.Bucket(int2key(id))
if bucket == nil {
return nil, ErrNoReview(id)
}
return bucket, nil
}
func getMetaData(tx *bolt.Tx) (metaData, error) {
var meta metaData
root := tx.Bucket(rootKey)
if root == nil {
return meta, ErrNoDB
}
metaValue := root.Get(metaKey)
dec := gob.NewDecoder(bytes.NewReader(metaValue))
err := dec.Decode(&meta)
return meta, err
}
func setMetaData(tx *bolt.Tx, meta metaData) error {
root := tx.Bucket(rootKey)
if root == nil {
return ErrNoDB
}
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
if err := enc.Encode(meta); err != nil {
return err
}
return root.Put(metaKey, buf.Bytes())
}
func NewBoltDB(path string) (*BoltDB, error) {
var boltDB BoltDB
db, err := bolt.Open(path, 0600, nil)
if err != nil {
return nil, err
}
boltDB.DB = db
err = db.Update(func(tx *bolt.Tx) error {
root, err := tx.CreateBucketIfNotExists(rootKey)
if err != nil {
return err
}
if v := root.Get(metaKey); v == nil {
meta := metaData{Summaries: make(map[string]review.Summary)}
if err := setMetaData(tx, meta); err != nil {
return err
}
}
if _, err := root.CreateBucketIfNotExists(reviewsKey); err != nil {
return err
}
_, err = root.CreateBucketIfNotExists(usersKey)
return err
})
return &boltDB, err
}
func (db *BoltDB) CreateReview(r review.R) (int, error) {
var (
err error
reviewID int
)
err = db.Update(func(tx *bolt.Tx) error {
meta, err := getMetaData(tx)
if err != nil {
return err
}
reviewsBkt, err := getReviewsBucket(tx)
if err != nil {
return err
}
ns, err := reviewsBkt.NextSequence()
if err != nil {
return err
}
reviewID = int(ns)
newReview, err := reviewsBkt.CreateBucket(int2key(reviewID))
if err != nil {
return err
}
r.Summary.ID = reviewID
meta.Summaries[strconv.Itoa(reviewID)] = r.Summary
if err := setMetaData(tx, meta); err != nil {
return err
}
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
if err := enc.Encode(r.Revisions); err != nil {
return err
}
return newReview.Put(revisionsKey, buf.Bytes())
})
return int(reviewID), err
}
func (db *BoltDB) GetReview(id int) (review.R, error) {
var (
review review.R
err error
)
err = db.Update(func(tx *bolt.Tx) error {
review, err = getReview(tx, id)
return err
})
return review, err
}
func getReview(tx *bolt.Tx, id int) (review.R, error) {
var (
revisions []review.Revision
review review.R
)
metaData, err := getMetaData(tx)
if err != nil {
return review, err
}
root := tx.Bucket(rootKey)
if root == nil {
return review, ErrNoDB
}
reviews := root.Bucket(reviewsKey)
if reviews == nil {
return review, ErrNoDB
}
reviewBkt, err := getReviewBucket(tx, id)
if err != nil {
return review, err
}
review.Summary = metaData.Summaries[strconv.Itoa(id)]
rev := reviewBkt.Get(revisionsKey)
dec := gob.NewDecoder(bytes.NewReader(rev))
if err := dec.Decode(&revisions); err != nil {
return review, err
}
review.Revisions = revisions
return review, nil
}
type reviewSlice []review.Summary
func (r reviewSlice) Len() int {
return len(r)
}
func (r reviewSlice) Swap(i, j int) {
r[i], r[j] = r[j], r[i]
}
func (r reviewSlice) Less(i, j int) bool {
return r[i].ID < r[j].ID
}
func (db *BoltDB) GetSummaries() ([]review.Summary, error) {
var (
result []review.Summary
metaData metaData
)
err := db.Update(func(tx *bolt.Tx) (err error) {
metaData, err = getMetaData(tx)
return
})
for _, s := range metaData.Summaries {
result = append(result, s)
}
sort.Sort(reviewSlice(result))
return result, err
}
func (db *BoltDB) SetSummary(id int, summary review.Summary) error {
return db.Update(func(tx *bolt.Tx) error {
metaData, err := getMetaData(tx)
if err != nil {
return err
}
metaData.Summaries[strconv.Itoa(id)] = summary
return setMetaData(tx, metaData)
})
}
func int2key(i int) []byte {
return strconv.AppendInt([]byte{}, int64(i), 10)
}
func (db *BoltDB) DeleteReview(id int) error {
return db.Update(func(tx *bolt.Tx) error {
reviewsBkt, err := getReviewsBucket(tx)
if err != nil {
return err
}
if err := reviewsBkt.DeleteBucket(int2key(id)); err != nil {
return reviewBucketErr(id, err)
}
metaData, err := getMetaData(tx)
if err != nil {
return err
}
delete(metaData.Summaries, strconv.Itoa(id))
return setMetaData(tx, metaData)
})
}
func reviewBucketErr(id int, err error) error {
switch err {
case bolt.ErrBucketNotFound:
return ErrNoReview(id)
}
return err
}
func (db *BoltDB) AddRevision(id int, revision review.Revision) error {
return db.Update(func(tx *bolt.Tx) error {
var revisions []review.Revision
reviewBkt, err := getReviewBucket(tx, id)
if err != nil {
return err
}
revisionsValue := reviewBkt.Get(revisionsKey)
if revisionsValue != nil {
dec := gob.NewDecoder(bytes.NewReader(revisionsValue))
if err := dec.Decode(&revisions); err != nil {
return err
}
}
revisions = append(revisions, revision)
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
if err := enc.Encode(revisions); err != nil {
return err
}
return reviewBkt.Put(revisionsKey, buf.Bytes())
})
}
// UpdateRevision overwrites the specified revision with a new one.
func (db *BoltDB) UpdateRevision(id, revId int, revision review.Revision) error {
return db.Update(func(tx *bolt.Tx) error {
reviewBkt, err := getReviewBucket(tx, id)
if err != nil {
return err
}
var revisions []review.Revision
revisionsValue := reviewBkt.Get(revisionsKey)
dec := gob.NewDecoder(bytes.NewReader(revisionsValue))
if err := dec.Decode(&revisions); err != nil {
return err
}
if revId >= len(revisions) {
return ErrNoRevision(revId)
}
revisions[revId] = revision
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
if err := enc.Encode(revisions); err != nil {
return err
}
return reviewBkt.Put(revisionsKey, buf.Bytes())
})
}
func getUsersBucket(tx *bolt.Tx) (b *bolt.Bucket, err error) {
root := tx.Bucket(rootKey)
if root == nil {
err = ErrNoDB
return
}
b = root.Bucket(usersKey)
if b == nil {
err = ErrNoDB
}
return
}
func (db *BoltDB) CreateUser(u review.User) error {
return db.Update(func(tx *bolt.Tx) error {
userBkt, err := getUsersBucket(tx)
if err != nil {
return err
}
if userValue := userBkt.Get([]byte(u.Name)); userValue != nil {
return ErrUserExists
}
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
if err := enc.Encode(u); err != nil {
return err
}
return userBkt.Put([]byte(u.Name), buf.Bytes())
})
}
func (db *BoltDB) UpdateUser(u review.User) error {
return db.Update(func(tx *bolt.Tx) error {
userBkt, err := getUsersBucket(tx)
if err != nil {
return err
}
if userValue := userBkt.Get([]byte(u.Name)); userValue == nil {
return ErrNoUser
}
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
if err := enc.Encode(u); err != nil {
return err
}
return userBkt.Put([]byte(u.Name), buf.Bytes())
})
}
func (db *BoltDB) GetUser(username string) (u review.User, err error) {
err = db.Update(func(tx *bolt.Tx) error {
userBkt, err := getUsersBucket(tx)
if err != nil {
return err
}
userValue := userBkt.Get([]byte(username))
if userValue == nil {
return ErrNoUser
}
dec := gob.NewDecoder(bytes.NewReader(userValue))
return dec.Decode(&u)
})
return
}
func (db *BoltDB) DeleteUser(username string) error {
return db.Update(func(tx *bolt.Tx) error {
userBkt, err := getUsersBucket(tx)
if err != nil {
return err
}
return userBkt.Delete([]byte(username))
})
}