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package db
import (
"bytes"
"encoding/json"
"fmt"
"log"
"net/url"
"strconv"
"strings"
"github.com/boltdb/bolt"
"github.com/gorilla/schema"
"github.com/nilslice/cms/content"
"github.com/nilslice/cms/management/editor"
"github.com/nilslice/cms/management/manager"
)
var store *bolt.DB
func init() {
var err error
store, err = bolt.Open("store.db", 0666, nil)
if err != nil {
log.Fatal(err)
}
// initialize db with all content type buckets
store.Update(func(tx *bolt.Tx) error {
for t := range content.Types {
_, err := tx.CreateBucketIfNotExists([]byte(t))
if err != nil {
return err
}
}
return nil
})
}
// Set inserts or updates values in the database.
// The `target` argument is a string made up of namespace:id (string:int)
func Set(target string, data url.Values) (int, error) {
t := strings.Split(target, ":")
ns, id := t[0], t[1]
// check if content id == -1 (indicating new post).
// if so, run an insert which will assign the next auto incremented int.
// this is done because boltdb begins its bucket auto increment value at 0,
// which is the zero-value of an int in the Item struct field for ID.
// this is a problem when the original first post (with auto ID = 0) gets
// overwritten by any new post, originally having no ID, defauting to 0.
if id == "-1" {
return insert(ns, data)
}
return update(ns, id, data)
}
func update(ns, id string, data url.Values) (int, error) {
cid, err := strconv.Atoi(id)
if err != nil {
return 0, err
}
err = store.Update(func(tx *bolt.Tx) error {
b, err := tx.CreateBucketIfNotExists([]byte(ns))
if err != nil {
return err
}
j, err := toJSON(ns, data)
if err != nil {
return err
}
err = b.Put([]byte(fmt.Sprintf("%d", cid)), j)
if err != nil {
return err
}
return nil
})
if err != nil {
return 0, nil
}
return cid, nil
}
func insert(ns string, data url.Values) (int, error) {
var effectedID int
err := store.Update(func(tx *bolt.Tx) error {
b, err := tx.CreateBucketIfNotExists([]byte(ns))
if err != nil {
return err
}
// get the next available ID and convert to string
// also set effectedID to int of ID
id, err := b.NextSequence()
if err != nil {
return err
}
cid := strconv.FormatUint(id, 10)
effectedID, err = strconv.Atoi(cid)
if err != nil {
return err
}
data.Add("id", cid)
j, err := toJSON(ns, data)
if err != nil {
return err
}
err = b.Put([]byte(cid), j)
if err != nil {
return err
}
return nil
})
if err != nil {
return 0, err
}
return effectedID, nil
}
func toJSON(ns string, data url.Values) ([]byte, error) {
// find the content type and decode values into it
t, ok := content.Types[ns]
if !ok {
return nil, fmt.Errorf(content.ErrTypeNotRegistered, ns)
}
post := t()
dec := schema.NewDecoder()
dec.SetAliasTag("json") // allows simpler struct tagging when creating a content type
dec.IgnoreUnknownKeys(true) // will skip over form values submitted, but not in struct
err := dec.Decode(post, data)
if err != nil {
return nil, err
}
slug, err := manager.Slug(post.(editor.Editable))
if err != nil {
return nil, err
}
post.(editor.Editable).SetSlug(slug)
// marshall content struct to json for db storage
j, err := json.Marshal(post)
if err != nil {
return nil, err
}
return j, nil
}
// Get retrives one item from the database. Non-existent values will return an empty []byte
// The `target` argument is a string made up of namespace:id (string:int)
func Get(target string) ([]byte, error) {
t := strings.Split(target, ":")
ns, id := t[0], t[1]
val := &bytes.Buffer{}
err := store.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(ns))
_, err := val.Write(b.Get([]byte(id)))
if err != nil {
fmt.Println(err)
return err
}
return nil
})
if err != nil {
return nil, err
}
return val.Bytes(), nil
}
// GetAll retrives all items from the database within the provided namespace
func GetAll(namespace string) [][]byte {
var posts [][]byte
store.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(namespace))
len := b.Stats().KeyN
posts = make([][]byte, 0, len)
b.ForEach(func(k, v []byte) error {
posts = append(posts, v)
return nil
})
return nil
})
return posts
}
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