120 lines
2.8 KiB
Go
120 lines
2.8 KiB
Go
package echotron
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import (
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"encoding/json"
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"fmt"
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"log"
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"net/http"
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"net/url"
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"time"
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)
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// PollingUpdates is a wrapper function for PollingUpdatesOptions.
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func PollingUpdates(token string) <-chan *Update {
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return PollingUpdatesOptions(token, true, UpdateOptions{Timeout: 120})
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}
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// PollingUpdatesOptions returns a read-only channel of incoming updates from the Telegram API.
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func PollingUpdatesOptions(token string, dropPendingUpdates bool, opts UpdateOptions) <-chan *Update {
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var updates = make(chan *Update)
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go func() {
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defer close(updates)
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var (
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api = NewAPI(token)
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timeout = opts.Timeout
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isFirstRun = true
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)
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// deletes webhook if present to run in long polling mode
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if _, err := api.DeleteWebhook(dropPendingUpdates); err != nil {
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log.Println("echotron.PollingUpdates", err)
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}
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for {
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if isFirstRun {
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opts.Timeout = 0
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}
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response, err := api.GetUpdates(&opts)
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if err != nil {
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log.Println("echotron.PollingUpdates", err)
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time.Sleep(5 * time.Second)
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continue
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}
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if !dropPendingUpdates || !isFirstRun {
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for _, u := range response.Result {
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updates <- u
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}
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}
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if l := len(response.Result); l > 0 {
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opts.Offset = response.Result[l-1].ID + 1
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}
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if isFirstRun {
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isFirstRun = false
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opts.Timeout = timeout
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}
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}
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}()
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return updates
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}
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// WebhookUpdates is a wrapper function for WebhookUpdatesOptions.
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func WebhookUpdates(url, token string) <-chan *Update {
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return WebhookUpdatesOptions(url, token, false, nil)
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}
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// WebhookUpdatesOptions returns a read-only channel of incoming updates from the Telegram API.
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// The webhookUrl should be provided in the following format: '<hostname>:<port>/<path>',
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// eg: 'https://example.com:443/bot_token'.
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// WebhookUpdatesOptions will then proceed to communicate the webhook url '<hostname>/<path>'
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// to Telegram and run a webserver that listens to ':<port>' and handles the path.
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func WebhookUpdatesOptions(whURL, token string, dropPendingUpdates bool, opts *WebhookOptions) <-chan *Update {
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u, err := url.Parse(whURL)
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if err != nil {
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panic(err)
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}
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wURL := u.Hostname() + u.EscapedPath()
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api := NewAPI(token)
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if _, err := api.SetWebhook(wURL, dropPendingUpdates, opts); err != nil {
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panic(err)
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}
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var updates = make(chan *Update)
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http.HandleFunc(u.EscapedPath(), func(w http.ResponseWriter, r *http.Request) {
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var update Update
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jsn, err := readRequest(r)
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if err != nil {
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log.Println("echotron.WebhookUpdates", err)
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return
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}
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if err := json.Unmarshal(jsn, &update); err != nil {
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log.Println("echotron.WebhookUpdates", err)
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return
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}
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updates <- &update
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})
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go func() {
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defer close(updates)
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port := fmt.Sprintf(":%s", u.Port())
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for {
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if err := http.ListenAndServe(port, nil); err != nil {
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log.Println("echotron.WebhookUpdates", err)
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time.Sleep(5 * time.Second)
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}
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}
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}()
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return updates
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}
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