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db.go
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db.go
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package main
import (
"encoding/json"
"io/ioutil"
"os"
)
// A DB read / writes scheduler's data from / to disk.
type DB struct {
Todos map[string]Todo
Triggers map[string]Trigger
filename string `json:"-"`
}
// NewDB returns a DB located in filename.
func NewDB(filename string) (*DB, error) {
db := DB{
filename: filename,
Todos: make(map[string]Todo),
Triggers: make(map[string]Trigger),
}
err := db.Read()
if err != nil {
return nil, err
}
return &db, nil
}
// Save stores the database onto disk. DB file will be created if doesn't exist.
func (db *DB) Write() error {
encoded, err := json.MarshalIndent(*db, "", " ")
if err != nil {
return err
}
err = ioutil.WriteFile(db.filename, encoded, 0644)
if err != nil {
return err
}
return nil
}
// Reads loads the database from disk. If file doesn't exit then DB will be empty.
func (db *DB) Read() error {
encoded, err := ioutil.ReadFile(db.filename)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
err = json.Unmarshal(encoded, db)
if err != nil {
return err
}
return nil
}