{{ if ne .Diff 0 }}{{ .Diff }}m{{ else }}start{{ end }}
{{ .Memo }}
{{ end }}
{{ end }}
`
// Moment is the main information this servers remembers
type Moment struct {
Key string
Time time.Time
Diff int64
Memo string
}
// main is the main function
func main() {
fmt.Println("Starting tracking backend server")
path := DBFilename
db, err := bolt.Open(path, 0666, nil)
if err != nil {
log.Println(err)
return
}
defer db.Close()
indieAuthHandler := &IndieAuthHandler{}
http.Handle("/auth/", http.StripPrefix("/auth/", indieAuthHandler))
ih := &indexHandler{DB: db}
http.Handle("/", ih)
mh := &momentHandler{DB: db}
http.Handle("/moment", mh)
log.Fatal(http.ListenAndServe(":8096", nil))
}
// loadMoments loads the moments with today as the prefix of the key from the database
func loadMoments(db *bolt.DB, today string) ([]Moment, error) {
var moments []Moment
err := db.View(func(tx *bolt.Tx) error {
// Assume bucket exists and has keys
b := tx.Bucket([]byte(BucketKeyMoments))
if b == nil {
// no bucket found, so moments should be empty
return nil
}
c := b.Cursor()
prefix := []byte(today)
var prevTime time.Time
for k, v := c.Seek(prefix); k != nil && bytes.HasPrefix(k, prefix); k, v = c.Next() {
var moment Moment
err := json.Unmarshal(v, &moment)
if err != nil {
return err
}
if prevTime.IsZero() {
moment.Diff = 0
} else {
d := float64(moment.Time.Sub(prevTime)) / 1000000000.0 / 60.0
moment.Diff = int64(math.Ceil(d))
}
prevTime = moment.Time
moments = append(moments, moment)
}
// TODO(peter): if there are no moments, here we can add a moment for the start of the day
return nil
})
return moments, err
}
// saveMemo saves one memo to the database, it automatically generates a key
// based on the timestamp
func saveMemo(db *bolt.DB, timestamp time.Time, memo string) error {
err := db.Update(func(tx *bolt.Tx) error {
bucket, err := tx.CreateBucketIfNotExists([]byte(BucketKeyMoments))
if err != nil {
return err
}
key := timestamp.Format(time.RFC3339)
m := Moment{
Key: key,
Memo: memo,
Time: timestamp,
}
buf, err := json.Marshal(m)
if err != nil {
return err
}
return bucket.Put([]byte(m.Key), buf)
})
return err
}