/
date.go
238 lines (208 loc) · 5.59 KB
/
date.go
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package main
import (
"bytes"
"encoding/gob"
"errors"
"fmt"
"time"
"github.com/boltdb/bolt"
)
var datesBucket = []byte("dates")
// Date represents a schedule for a specific date
type Date struct {
Group string // The group identifier
Target string // The target number
Date time.Time // Start timestamp of event
Time time.Duration // Duration of event
}
// TimeToDateKey returns the BoltDB "date" bucket key for the
// given time.
func TimeToDateKey(t time.Time) []byte {
return []byte(t.String())
}
// DateRangeFor returns the BoltDB "date" bucket keys for
// the start and stop range filters to find Dates which
// may be applicable for the given time.
// We return -48hours and current.
func DateRangeFor(t time.Time) (from, to []byte) {
start := t.Add(-48 * time.Hour)
return TimeToDateKey(start), TimeToDateKey(t)
}
// DatesForGroup returns all Dates for the provided group
func DatesForGroup(db *bolt.DB, g *Group) (ret []Date, err error) {
err = db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(g.Key())
if b == nil {
return errors.New("Group bucket not found")
}
b = b.Bucket(datesBucket)
if b == nil {
return errors.New("Dates bucket not found")
}
c := b.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
var d Date
err = decodeDate(v, &d)
if err != nil {
Log.Error("Failed to decode date", "raw", v, "error", err)
continue
}
ret = append(ret, d)
}
return nil
})
return
}
// ActiveDate returns the currently-active Date in the schedule.
func ActiveDate(db *bolt.DB, g *Group, t time.Time) *Date {
var d Date
var err error
err = db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(g.Key())
if b == nil {
return fmt.Errorf("Group bucket not found")
}
b = b.Bucket(datesBucket)
if b == nil {
return fmt.Errorf("Dates bucket not found")
}
c := b.Cursor()
Log.Debug("Checking dates for", "group", g.Name, "size", b.Stats().KeyN)
for k, v := c.First(); k != nil; k, v = c.Next() {
Log.Debug("Checking date", "group", g.Name)
err = decodeDate(v, &d)
if err != nil {
Log.Error("Failed to decode date", "raw", v, "error", err)
continue
}
if d.ActiveAt(t) {
// Found
return nil
}
}
return fmt.Errorf("No active date found")
})
if err != nil {
Log.Info("Date target not found", "error", err, "group", g.Name)
return nil
}
if d.Target == "" {
return nil
}
return &d
}
// Key returns the BoltDB key for this date
func (d *Date) Key() []byte {
return []byte(d.Date.String())
}
// Save stores the Date in the database
func (d *Date) Save(tx *bolt.Tx) error {
b, err := tx.CreateBucketIfNotExists([]byte(d.Group))
if err != nil {
return err
}
b, err = b.CreateBucketIfNotExists(datesBucket)
if err != nil {
return err
}
data, err := encodeDate(d)
if err != nil {
return err
}
return b.Put(d.Key(), data)
}
// ToExternal exports a Date schedule to its external version
func (d *Date) ToExternal() *DateExternal {
var e DateExternal
e.Group = d.Group
e.Target = d.Target
e.Date = d.Date.Format("2006-01-02")
e.Start = d.Date.Format("15:04")
e.Stop = d.Date.Add(d.Time).Format("15:04")
return &e
}
// ActiveAt says whether the given time is
// within the schedule of this Date schedule
func (d *Date) ActiveAt(t time.Time) bool {
return t.After(d.Date.Add(-time.Second)) && t.Before(d.Date.Add(d.Time).Add(time.Second))
}
// NewDateFromCSV takes a slice of strings (from a CSV), and
// parses them into a Unit.
// Format:
// `groupId`, `date`, `startTime`, `stopTime`, `cell/target`
func NewDateFromCSV(db *bolt.DB, d []string) (*Date, error) {
if len(d) != 5 {
return nil, fmt.Errorf("CSV not in Group,Date,Time,Cell format")
}
e := DateExternal{
Group: d[0],
Date: d[1],
Start: d[2],
Stop: d[3],
Target: d[4],
}
return e.ToDate(db)
}
// DateExternal represents a Date schedule unit
// suitable for import and export
type DateExternal struct {
Group string `json:"group"` // Group ID
Target string `json:"target"` // Target
Date string `json:"date"` // Start date of event (YYYY-MM-DD)
Start string `json:"start"` // Start time (HH:MM)
Stop string `json:"stop"` // Stop Time (HH:MM)
}
// ToDate converts an exported date schedule to a proper Date schedule
func (e *DateExternal) ToDate(db *bolt.DB) (*Date, error) {
var ret Date
// Short-circuit if we have no target
if e.Target == "" {
return nil, ErrNilTarget
}
// 0: group
ret.Group = e.Group
if ret.Group == "" {
return nil, fmt.Errorf("Group is mandatory")
}
g, err := getGroup(db, e.Group)
if err != nil {
return nil, fmt.Errorf("Failed to find group: %s", err.Error())
}
loc, err := g.GetLocation()
if err != nil {
return nil, fmt.Errorf("Failed to get group location: %s", err.Error())
}
// 1: Date (yyyy-mm-dddd)
date, err := parseDate(e.Date, loc)
if err != nil {
return nil, fmt.Errorf("Failed to parse date: %s", err.Error())
}
ret.Date = date
// 2: Start time
start, err := parseTime(e.Start)
if err != nil {
return nil, fmt.Errorf("Failed to parse time range: %s", err.Error())
}
// 3: Stop time
stop, err := parseTime(e.Stop)
if err != nil {
return nil, fmt.Errorf("Failed to parse time range: %s", err.Error())
}
diff := stop - start
if diff < 0 {
// If the time is negative, we wrapped to the next day
diff += 24 * time.Hour
}
ret.Date = ret.Date.Add(start)
ret.Time = diff
ret.Target = e.Target
return &ret, nil
}
func encodeDate(d *Date) ([]byte, error) {
var buf bytes.Buffer
err := gob.NewEncoder(&buf).Encode(d)
return buf.Bytes(), err
}
func decodeDate(data []byte, d *Date) error {
return gob.NewDecoder(bytes.NewReader(data)).Decode(d)
}