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|
package main
import (
"encoding/json"
"fmt"
"os"
"github.com/boltdb/bolt"
)
// Import converts an exported database dump into a new database.
func Import(path string, input string) {
f, err := os.Open(input)
if err != nil {
fatal(err)
return
}
defer f.Close()
// Read in entire dump.
var root []*rawMessage
if err := json.NewDecoder(f).Decode(&root); err != nil {
fatal(err)
}
// Open the database.
db, err := bolt.Open(path, 0600)
if err != nil {
fatal(err)
return
}
defer db.Close()
// Insert entire dump into database.
err = db.Update(func(tx *bolt.Tx) error {
// Loop over every message and create a bucket.
for _, message := range root {
// Validate that root messages are buckets.
if message.Type != "bucket" {
return fmt.Errorf("invalid root type: %q", message.Type)
}
// Create the bucket if it doesn't exist.
b, err := tx.CreateBucketIfNotExists(message.Key)
if err != nil {
return fmt.Errorf("create bucket: %s", err)
}
// Decode child messages.
var children []*rawMessage
if err := json.Unmarshal(message.Value, &children); err != nil {
return fmt.Errorf("decode children: %s", err)
}
// Import all the values into the bucket.
if err := importBucket(b, children); err != nil {
return fmt.Errorf("import bucket: %s", err)
}
}
return nil
})
if err != nil {
fatal("update: ", err)
}
}
func importBucket(b *bolt.Bucket, children []*rawMessage) error {
// Decode each message into a key/value pair.
for _, child := range children {
// Bucket messages are handled recursively.
if child.Type == "bucket" {
// Create the bucket if it doesn't exist.
subbucket, err := b.CreateBucketIfNotExists(child.Key)
if err != nil {
return fmt.Errorf("create bucket: %s", err)
}
// Decode child messages.
var subchildren []*rawMessage
if err := json.Unmarshal(child.Value, &subchildren); err != nil {
return fmt.Errorf("decode children: %s", err)
}
// Import subbucket.
if err := importBucket(subbucket, subchildren); err != nil {
return fmt.Errorf("import bucket: %s", err)
}
continue
}
// Non-bucket values are decoded from base64.
var value []byte
if err := json.Unmarshal(child.Value, &value); err != nil {
return fmt.Errorf("decode value: %s", err)
}
// Insert key/value into bucket.
if err := b.Put(child.Key, value); err != nil {
return fmt.Errorf("put: %s", err)
}
}
return nil
}
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