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/*
Package longpoll implements Bots Long Poll API.
See more https://vk.com/dev/bots_longpoll
*/
package longpoll // import "github.com/SevereCloud/vksdk/v2/longpoll-bot"
import (
"context"
"encoding/json"
"fmt"
"net/http"
"github.com/SevereCloud/vksdk/v2"
"github.com/SevereCloud/vksdk/v2/api"
"github.com/SevereCloud/vksdk/v2/events"
"github.com/SevereCloud/vksdk/v2/internal"
)
// Response struct.
type Response struct {
Ts string `json:"ts"`
Updates []events.GroupEvent `json:"updates"`
Failed int `json:"failed"`
}
// LongPoll struct.
type LongPoll struct {
GroupID int
Server string
Key string
Ts string
Wait int
VK *api.VK
Client *http.Client
cancel context.CancelFunc
funcFullResponseList []func(Response)
events.FuncList
}
// NewLongPoll returns a new LongPoll.
//
// The LongPoll will use the http.DefaultClient.
// This means that if the http.DefaultClient is modified by other components
// of your application the modifications will be picked up by the SDK as well.
func NewLongPoll(vk *api.VK, groupID int) (*LongPoll, error) {
lp := &LongPoll{
VK: vk,
GroupID: groupID,
Wait: 25,
Client: http.DefaultClient,
}
lp.FuncList = *events.NewFuncList()
err := lp.updateServer(true)
return lp, err
}
// NewLongPollCommunity returns a new LongPoll for community token.
//
// The LongPoll will use the http.DefaultClient.
// This means that if the http.DefaultClient is modified by other components
// of your application the modifications will be picked up by the SDK as well.
func NewLongPollCommunity(vk *api.VK) (*LongPoll, error) {
resp, err := vk.GroupsGetByID(nil)
if err != nil {
return nil, err
}
lp := &LongPoll{
VK: vk,
GroupID: resp[0].ID,
Wait: 25,
Client: http.DefaultClient,
}
lp.FuncList = *events.NewFuncList()
err = lp.updateServer(true)
return lp, err
}
func (lp *LongPoll) updateServer(updateTs bool) error {
params := api.Params{
"group_id": lp.GroupID,
}
serverSetting, err := lp.VK.GroupsGetLongPollServer(params)
if err != nil {
return err
}
lp.Key = serverSetting.Key
lp.Server = serverSetting.Server
if updateTs {
lp.Ts = serverSetting.Ts
}
return nil
}
func (lp *LongPoll) check(ctx context.Context) (response Response, err error) {
u := fmt.Sprintf("%s?act=a_check&key=%s&ts=%s&wait=%d", lp.Server, lp.Key, lp.Ts, lp.Wait)
req, err := http.NewRequestWithContext(ctx, http.MethodGet, u, nil)
if err != nil {
return response, err
}
resp, err := lp.Client.Do(req)
if err != nil {
return response, err
}
defer resp.Body.Close()
err = json.NewDecoder(resp.Body).Decode(&response)
if err != nil {
return response, err
}
err = lp.checkResponse(response)
return response, err
}
func (lp *LongPoll) checkResponse(response Response) (err error) {
switch response.Failed {
case 0:
lp.Ts = response.Ts
case 1:
lp.Ts = response.Ts
case 2:
err = lp.updateServer(false)
case 3:
err = lp.updateServer(true)
default:
err = &Failed{response.Failed}
}
return
}
func (lp *LongPoll) autoSetting(ctx context.Context) error {
params := api.Params{
"group_id": lp.GroupID,
"enabled": true,
"api_version": vksdk.API,
}.WithContext(ctx)
for _, event := range lp.ListEvents() {
params[string(event)] = true
}
// Updating LongPoll settings
_, err := lp.VK.GroupsSetLongPollSettings(params)
return err
}
// Run handler.
func (lp *LongPoll) Run() error {
return lp.RunWithContext(context.Background())
}
// RunWithContext handler.
func (lp *LongPoll) RunWithContext(ctx context.Context) error {
return lp.run(ctx)
}
func (lp *LongPoll) run(ctx context.Context) error {
ctx, lp.cancel = context.WithCancel(ctx)
err := lp.autoSetting(ctx)
if err != nil {
return err
}
for {
select {
case _, ok := <-ctx.Done():
if !ok {
return nil
}
default:
resp, err := lp.check(ctx)
if err != nil {
return err
}
ctx = context.WithValue(ctx, internal.LongPollTsKey, resp.Ts)
for _, event := range resp.Updates {
err = lp.Handler(ctx, event)
if err != nil {
return err
}
}
for _, f := range lp.funcFullResponseList {
f(resp)
}
}
}
}
// Shutdown gracefully shuts down the longpoll without interrupting any active connections.
func (lp *LongPoll) Shutdown() {
if lp.cancel != nil {
lp.cancel()
}
}
// FullResponse handler.
func (lp *LongPoll) FullResponse(f func(Response)) {
lp.funcFullResponseList = append(lp.funcFullResponseList, f)
}
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