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package main
import (
"encoding/json"
"fmt"
"os"
"github.com/boltdb/bolt"
)
// Export exports the entire database as a JSON document.
func Export(path string) {
if _, err := os.Stat(path); os.IsNotExist(err) {
fatal(err)
return
}
// Open the database.
db, err := bolt.Open(path, 0600)
if err != nil {
fatal(err)
return
}
defer db.Close()
err = db.View(func(tx *bolt.Tx) error {
// Loop over every bucket and export it as a raw message.
var root []*rawMessage
err := tx.ForEach(func(name []byte, b *bolt.Bucket) error {
message, err := exportBucket(b)
if err != nil {
fatal(err)
}
message.Key = name
root = append(root, message)
return nil
})
if err != nil {
return err
}
// Encode all buckets into JSON.
output, err := json.Marshal(root)
if err != nil {
return fmt.Errorf("encode: ", err)
}
print(string(output))
return nil
})
if err != nil {
fatal(err)
}
}
func exportBucket(b *bolt.Bucket) (*rawMessage, error) {
// Encode individual key/value pairs into raw messages.
var children = make([]*rawMessage, 0)
err := b.ForEach(func(k, v []byte) error {
var err error
// If there is no value then it is a bucket.
if v == nil {
child, err := exportBucket(b.Bucket(k))
if err != nil {
return fmt.Errorf("bucket: %s", err)
}
child.Key = k
children = append(children, child)
return nil
}
// Otherwise it's a regular key.
var child = &rawMessage{Key: k}
if child.Value, err = json.Marshal(v); err != nil {
return fmt.Errorf("value: %s", err)
}
children = append(children, child)
return nil
})
if err != nil {
return nil, err
}
// Encode bucket into a raw message.
var root = rawMessage{Type: "bucket"}
if root.Value, err = json.Marshal(children); err != nil {
return nil, fmt.Errorf("children: %s", err)
}
return &root, nil
}
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