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package schedule
import (
"bufio"
"encoding/xml"
"fmt"
"net/http"
"sync"
"time"
)
type Service interface {
GetSchedule() (*Schedule, *time.Time, error)
}
type Schedule struct {
XMLName xml.Name `json:"-" xml:"schedule"`
Conference Conference `json:"conference" xml:"conference"`
Tracks []Track `json:"tracks" xml:"tracks>track"`
Days []Day `json:"days" xml:"day"`
}
type Conference struct {
Title string `json:"title" xml:"title"`
Venue string `json:"venue" xml:"venue"`
City string `json:"city" xml:"city"`
Start string `json:"start" xml:"start"`
End string `json:"end" xml:"end"`
Days int `json:"days" xml:"days"`
DayChange string `json:"dayChange" xml:"day_change"`
TimeslotDuration string `json:"timeslotDuration" xml:"timeslot_duration"`
BaseURL string `json:"baseUrl" xml:"base_url"`
TimeZoneName string `json:"timeZoneName" xml:"time_zone_name"`
}
type Track struct {
Name string `json:"name" xml:",chardata"`
}
type Day struct {
Date string `json:"date" xml:"date,attr"`
Start string `json:"start" xml:"start"`
End string `json:"end" xml:"end"`
Rooms []Room `json:"rooms" xml:"room"`
}
type Room struct {
Name string `json:"name" xml:"name,attr"`
Events []Event `json:"events" xml:"event"`
}
type Event struct {
ID int `json:"id" xml:"id,attr"`
GUID string `json:"guid" xml:"guid,attr"`
Date string `json:"date" xml:"date"`
Start string `json:"start" xml:"start"`
Duration string `json:"duration" xml:"duration"`
Room string `json:"room" xml:"room"`
URL string `json:"url" xml:"url"`
Track string `json:"track" xml:"track"`
Type string `json:"type" xml:"type"`
Title string `json:"title" xml:"title"`
Abstract string `json:"abstract" xml:"abstract"`
Persons []Person `json:"persons" xml:"persons>person"`
Attachments []Attachment `json:"attachments" xml:"attachments>attachment"`
Links []Link `json:"links" xml:"links>link"`
}
type Person struct {
ID int `json:"id" xml:"id,attr"`
Name string `json:"name" xml:",chardata"`
}
type Attachment struct {
Type string `json:"string" xml:"id,attr"`
Href string `json:"href" xml:"href,attr"`
Name string `json:"name" xml:",chardata"`
}
type Link struct {
Href string `json:"href" xml:"href,attr"`
Name string `json:"name" xml:",chardata"`
}
type service struct {
schedule *Schedule
pentabarfUrl string
lastUpdated time.Time
lock sync.Mutex
}
func NewService(pentabarfUrl string) (Service, error) {
service := &service{
pentabarfUrl: pentabarfUrl,
lastUpdated: time.Unix(0, 0),
}
err := service.updateSchedule()
if err != nil {
return nil, fmt.Errorf("could not read schedule from '%s' (is it a valid pentabarf XML file?): %w", pentabarfUrl, err)
}
return service, nil
}
func (s *service) GetSchedule() (*Schedule, *time.Time, error) {
if s.hasScheduleExpired() {
err := s.updateSchedule()
if err != nil {
return nil, nil, err
}
}
return s.schedule, &s.lastUpdated, nil
}
func (s *service) hasScheduleExpired() bool {
expire := s.lastUpdated.Add(15 * time.Minute)
return time.Now().After(expire)
}
func (s *service) updateSchedule() error {
s.lock.Lock()
defer s.lock.Unlock()
if !s.hasScheduleExpired() {
return nil
}
res, err := http.Get(s.pentabarfUrl)
if err != nil {
return err
}
reader := bufio.NewReader(res.Body)
var schedule Schedule
decoder := xml.NewDecoder(reader)
if err := decoder.Decode(&schedule); err != nil {
return fmt.Errorf("failed to decode XML: %w", err)
}
s.schedule = &schedule
s.lastUpdated = time.Now()
return nil
}
|
