Allow asking for the current public IP

Ref #5

This commit adds the /getIP telegram command that allows asking for the
current public IP that the bot has stored.

As it is just a working version and the telegram API is not yet
complete, this command is not yet really tested. I need to provide a
more stable version of my Telegram API beforehand because as of now it's
just a mess really, but this will do for now.

tracker/bot/bot.go

@@ -9,6 +9,8 @@ import (
 	"git.faercol.me/faercol/public-ip-tracker/tracker/config"
 	"git.faercol.me/faercol/public-ip-tracker/tracker/ip"
 	"github.com/ahugues/go-telegram-api/bot"
+	"github.com/ahugues/go-telegram-api/notifier"
+	"github.com/ahugues/go-telegram-api/structs"
 )
 
 type Notifier struct {
@@ -16,6 +18,7 @@ type Notifier struct {
 	cancel      context.CancelFunc
 	tgBot       bot.Bot
 	tgChatID    int64
+	tgWatcher   notifier.EventNotifier
 	ipGetter    ip.IPGetter
 	timeGetter  func() time.Time
 	currentIP   net.IP
@@ -49,7 +52,35 @@ func (n *Notifier) sendUpdatedIPMsg() error {
 	return nil
 }
 
+func (n *Notifier) sendCurrentIP() error {
+	statusMsg := fmt.Sprintf("Current public IP is %s", n.currentIP)
+	if err := n.tgBot.SendMessage(n.ctx, n.tgChatID, statusMsg); err != nil {
+		return fmt.Errorf("failed to send message: %w", err)
+	}
+	return nil
+}
+
+func (n *Notifier) watchTG() {
+	id, updateChan := n.tgWatcher.Subscribe([]structs.UpdateType{structs.UpdateMessage})
+	go n.tgWatcher.Run(n.ctx)
+
+	for {
+		select {
+		case update := <-updateChan:
+			if update.Message.Text == "/getIP" {
+				if err := n.sendCurrentIP(); err != nil {
+					n.errChan <- fmt.Errorf("failed to reply current public IP: %w", err)
+				}
+			}
+		case <-n.ctx.Done():
+			n.tgWatcher.Unsubscribe(id)
+			return
+		}
+	}
+}
+
 func (n *Notifier) Run() {
+	go n.watchTG()
 	for {
 		select {
 		case <-time.After(n.frequency):
@@ -93,5 +124,6 @@ func New(ctx context.Context, config *config.Config) *Notifier {
 		errChan:    make(chan error, 10),
 		exitChan:   make(chan struct{}, 1),
 		frequency:  config.PollingFrequency,
+		tgWatcher:  notifier.New(config.Telegram.Token),
 	}
 }

tracker/bot/bot_test.go

@@ -9,6 +9,7 @@ import (
 
 	iptest "git.faercol.me/faercol/public-ip-tracker/tracker/ip/test"
 	"github.com/ahugues/go-telegram-api/structs"
+	"github.com/google/uuid"
 )
 
 const expectedChatID = 42
@@ -31,6 +32,17 @@ func (mb *mockTGBot) SendMessage(ctx context.Context, chatID int64, content stri
 	return mb.SendMessageFunc(ctx, chatID, content)
 }
 
+// Need to mock the notifier here too, but will do later on, I need to improve my lib in the future
+type mockTGNotifier struct {
+}
+
+func (mn *mockTGNotifier) Run(ctx context.Context) {}
+func (mn *mockTGNotifier) Subscribe(eventTypes []structs.UpdateType) (uuid.UUID, <-chan structs.Update) {
+	return uuid.New(), make(chan structs.Update)
+}
+func (mn *mockTGNotifier) Unsubscribe(id uuid.UUID) {}
+func (mn *mockTGNotifier) ErrChan() <-chan error    { return nil }
+
 func TestInit(t *testing.T) {
 	t.Parallel()
 
@@ -62,6 +74,7 @@ func TestInit(t *testing.T) {
 		timeGetter: func() time.Time { return time.Date(2023, 1, 28, 14, 17, 12, 0, time.UTC) },
 		ipGetter:   &ipGetter,
 		frequency:  1 * time.Minute,
+		tgWatcher:  &mockTGNotifier{},
 	}
 
 	if err := bot.SendInitMessage(); err != nil {
@@ -105,6 +118,7 @@ func TestUpdateIP(t *testing.T) {
 		exitChan:   make(chan struct{}, 1),
 		errChan:    make(chan error, 5),
 		ipGetter:   &ipGetter,
+		tgWatcher:  &mockTGNotifier{},
 		frequency:  500 * time.Millisecond,
 	}
 
@@ -161,6 +175,7 @@ func TestUpdateIPNoChange(t *testing.T) {
 		exitChan:   make(chan struct{}, 1),
 		errChan:    make(chan error, 5),
 		ipGetter:   &ipGetter,
+		tgWatcher:  &mockTGNotifier{},
 		frequency:  100 * time.Millisecond,
 	}
 

tracker/go.mod

@@ -2,4 +2,7 @@ module git.faercol.me/faercol/public-ip-tracker/tracker
 
 go 1.16
 
-require github.com/ahugues/go-telegram-api v0.0.0-20230128131122-4d5782beddd0
+require (
+	github.com/ahugues/go-telegram-api v0.0.0-20230129174520-b466e4321512
+	github.com/google/uuid v1.3.0
+)

tracker/go.sum

@@ -1,5 +1,6 @@
-github.com/ahugues/go-telegram-api v0.0.0-20230128131122-4d5782beddd0 h1:1R472WmBuKK9Bvt4+rlqj01z1MwlVic3Xzgjvql3PXA=
+github.com/ahugues/go-telegram-api v0.0.0-20230129174520-b466e4321512 h1:wYRUqplA7L8W9t6/k2ZYWxVVx4zYoW/1tpdogoJ/RFY=
-github.com/ahugues/go-telegram-api v0.0.0-20230128131122-4d5782beddd0/go.mod h1:8I/JWxd9GYM7dHOgGmkRI3Ei1u+nGvzeR2knIMmFw7E=
+github.com/ahugues/go-telegram-api v0.0.0-20230129174520-b466e4321512/go.mod h1:8I/JWxd9GYM7dHOgGmkRI3Ei1u+nGvzeR2knIMmFw7E=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/yuin/goldmark v1.4.1/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=