forked from ttacon/box
/
events.go
232 lines (203 loc) · 4.91 KB
/
events.go
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package box
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"strconv"
"github.com/google/go-querystring/query"
)
type EventService struct {
*Client
}
type Event struct {
Type string `json:"type"`
EventID string `json:"event_id"`
CreatedBy *User `json:"created_by"`
EventType string `json:"event_type"`
SessionID string `json:"session_id"`
Source json.RawMessage `json:"source"`
File *File `json:"-"`
Folder *Folder `json:"-"`
Comment *Comment `json:"-"`
Collaboration *Collaboration `json:"-"`
// Test and add the rest
}
type EventCollection struct {
Entries []*Event `json:"entries"`
ChunkSize int `json:"chunk_size"`
NextStreamPosition int `json:"next_stream_position"`
}
type EventQueryOptions struct {
StreamPosition string `url:"stream_position"`
StreamType string `url:"stream_type"`
Limit int `url:"limit"`
}
// Events retrieves events for the currently authenticated user.
//
// See: https://developers.box.com/docs/#events-get-events-for-a-user
func (e *EventService) Events(options EventQueryOptions) (*http.Response, *EventCollection, error) {
queryString, err := query.Values(options)
if err != nil {
return nil, nil, err
}
req, err := e.NewRequest(
"GET",
"/events?"+queryString.Encode(),
nil,
)
if err != nil {
return nil, nil, err
}
var data EventCollection
resp, err := e.Do(req, &data)
if err != nil {
return resp, nil, err
}
for _, eve := range data.Entries {
if eve.Source == nil {
continue
}
if err = finishParsing(eve); err != nil {
return resp, nil, err
}
}
return resp, &data, err
}
type LongPollInfo struct {
ChunkSize int `json:"chunk_size"`
Entries []LongPollConnInfo `json:"entries"`
}
type LongPollConnInfo struct {
Type string `json:"type"`
URL string `json:"url"`
TTL string `json:"ttl"`
MaxRetries string `json:"max_retries"`
RetryTimeout int `json:"retry_timeout"`
}
func (e *EventService) LongPollURL() (*http.Response, *LongPollInfo, error) {
req, err := e.NewRequest(
"OPTIONS",
"/events",
nil,
)
if err != nil {
return nil, nil, err
}
var data LongPollInfo
resp, err := e.Do(req, &data)
return resp, &data, err
}
func (e *EventService) ListenForEvent(i LongPollConnInfo, lastSync string) (*http.Response, []*Event, error) {
// get events for stream_position=now for sync token
var streamPos = lastSync
if len(streamPos) == 0 {
resp, events, err := e.Events(EventQueryOptions{
StreamPosition: "now",
})
if err != nil {
return resp, nil, err
}
streamPos = strconv.Itoa(events.NextStreamPosition)
}
// TODO(ttacon): timeout info
req, err := http.NewRequest(
"GET",
i.URL,
nil,
)
if err != nil {
return nil, nil, err
}
var d = make(map[string]interface{})
resp, err := e.Do(req, &d)
// TODO(ttacon): deal with timeouts
if err != nil {
return resp, nil, err
}
// get next event with last synced note
resp, events, err := e.Events(EventQueryOptions{
StreamPosition: streamPos,
Limit: 1,
})
if err != nil {
return resp, nil, err
}
return resp, events.Entries, err
}
func (e *EventService) Channel(size int) chan *Event {
eventStream := make(chan *Event, size)
go e.streamEvents(eventStream)
return eventStream
}
func (e *EventService) streamEvents(tunnel chan *Event) {
for {
_, longPollInfo, err := e.LongPollURL()
if err != nil {
close(tunnel)
return
}
if len(longPollInfo.Entries) != 1 {
close(tunnel)
return
}
_, events, err := e.ListenForEvent(longPollInfo.Entries[0], "")
if err != nil {
close(tunnel)
return
}
for _, eve := range events {
tunnel <- eve
}
}
}
////////// types //////////
////////// functions //////////
////////// enum funcs, whooo! //////////
func finishParsing(ev *Event) error {
switch eventSourceType(ev) {
case "file":
ev.File = &File{}
err := json.Unmarshal(ev.Source, ev.File)
if err != nil {
return err
}
ev.Source = nil
case "folder":
ev.Folder = &Folder{}
err := json.Unmarshal(ev.Source, ev.Folder)
if err != nil {
return err
}
ev.Source = nil
case "comment":
ev.Comment = &Comment{}
err := json.Unmarshal(ev.Source, ev.Comment)
if err != nil {
return err
}
ev.Source = nil
case "collaboration":
ev.Collaboration = &Collaboration{}
err := json.Unmarshal(ev.Source, ev.Collaboration)
if err != nil {
return err
}
ev.Source = nil
default:
fmt.Println(eventSourceType(ev))
return errors.New("not implemented yet (read I'm lazy :P )")
}
return nil
}
func eventSourceType(ev *Event) string {
// ugly hack, but performant enough until we generate and then
// manipulate unmarshaling code
type EventSourceType struct {
Type string `json:"type"`
}
var est EventSourceType
// explicit swallow the error
_ = json.Unmarshal(ev.Source, &est)
return est.Type
}