Add publig IP getter #9
3 changed files with 204 additions and 1 deletions
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@ -6,6 +6,7 @@ import (
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"time"
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"git.faercol.me/faercol/public-ip-tracker/tracker/config"
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"git.faercol.me/faercol/public-ip-tracker/tracker/ip"
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"github.com/ahugues/go-telegram-api/bot"
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)
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@ -14,10 +15,16 @@ type Notifier struct {
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cancel context.CancelFunc
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tgBot *bot.ConcreteBot
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notifChannel int64
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ipGetter *ip.IPGetter
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}
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func (n *Notifier) SendInitMessage() error {
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initMsg := fmt.Sprintf("Public IP tracked initialized at %v", time.Now())
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publicIP, err := n.ipGetter.GetCurrentPublicIP(n.ctx)
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if err != nil {
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return fmt.Errorf("failed to get current public IP: %w", err)
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}
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initMsg := fmt.Sprintf("Public IP tracker initialized at %v, public IP is %s", time.Now(), publicIP)
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if err := n.tgBot.SendMessage(n.ctx, n.notifChannel, initMsg); err != nil {
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return fmt.Errorf("failed to send initialization message: %w", err)
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}
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@ -33,5 +40,6 @@ func New(ctx context.Context, config *config.Config) *Notifier {
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cancel: cancel,
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tgBot: tgBot,
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notifChannel: config.Telegram.ChannelID,
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ipGetter: ip.New(),
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}
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}
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61
tracker/ip/ip.go
Normal file
61
tracker/ip/ip.go
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@ -0,0 +1,61 @@
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package ip
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"net"
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"net/http"
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"time"
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)
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const ifconfigURL = "https://ifconfig.me"
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const httpMaxRead = 100
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const httpTimeout = 10 * time.Second
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type IPGetter struct {
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httpClt *http.Client
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remoteAddress string
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timeout time.Duration
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}
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func (c *IPGetter) GetCurrentPublicIP(ctx context.Context) (net.IP, error) {
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reqCtx, cancel := context.WithTimeout(ctx, c.timeout)
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defer cancel()
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req, err := http.NewRequestWithContext(reqCtx, http.MethodGet, c.remoteAddress, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to prepare public IP request: %w", err)
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}
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resp, err := c.httpClt.Do(req)
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if err != nil {
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return nil, fmt.Errorf("failed to get current IP from ifconfig: %w", err)
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}
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("invalid returncode %d", resp.StatusCode)
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}
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if resp.ContentLength > httpMaxRead {
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return nil, fmt.Errorf("response too big: %d/%d", resp.ContentLength, httpMaxRead)
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}
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buf := bytes.NewBuffer([]byte{})
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if _, err := io.CopyN(buf, resp.Body, resp.ContentLength); err != nil {
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return nil, fmt.Errorf("error parsing body: %w", err)
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}
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content := string(buf.Bytes())
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res := net.ParseIP(content)
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if res == nil {
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return nil, fmt.Errorf("got an invalid public IP %q", content)
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}
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return res, nil
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}
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func New() *IPGetter {
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return &IPGetter{
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httpClt: http.DefaultClient,
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remoteAddress: ifconfigURL,
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timeout: httpTimeout,
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}
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}
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134
tracker/ip/ip_test.go
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134
tracker/ip/ip_test.go
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@ -0,0 +1,134 @@
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package ip
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import (
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"context"
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"net/http"
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"net/http/httptest"
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"strings"
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"testing"
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"time"
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)
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func TestGetIPOK(t *testing.T) {
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t.Parallel()
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mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusOK)
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w.Write([]byte("198.51.100.42"))
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}))
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defer mockSrv.Close()
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clt := IPGetter{
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httpClt: mockSrv.Client(),
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remoteAddress: mockSrv.URL,
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timeout: 1 * time.Second,
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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val, err := clt.GetCurrentPublicIP(ctx)
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if err != nil {
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t.Fatalf("Unexpected error %s", err.Error())
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}
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if val.String() != "198.51.100.42" {
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t.Fatalf("Unexpected public IP %v", val)
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}
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}
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func TestGetIPServerErr(t *testing.T) {
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t.Parallel()
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mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusInternalServerError)
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}))
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defer mockSrv.Close()
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clt := IPGetter{
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httpClt: mockSrv.Client(),
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remoteAddress: mockSrv.URL,
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timeout: 1 * time.Second,
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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_, err := clt.GetCurrentPublicIP(ctx)
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if err == nil {
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t.Fatal("Unexpected nil error")
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} else if err.Error() != "invalid returncode 500" {
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t.Fatalf("Unexpected error %s", err.Error())
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}
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}
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func TestGetIPUnreachable(t *testing.T) {
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t.Parallel()
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mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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}))
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mockSrv.Close()
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clt := IPGetter{
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httpClt: mockSrv.Client(),
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remoteAddress: mockSrv.URL,
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timeout: 1 * time.Second,
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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_, err := clt.GetCurrentPublicIP(ctx)
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if err == nil {
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t.Fatal("Unexpected nil error")
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} else if !strings.Contains(err.Error(), "connect: connection refused") {
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t.Fatalf("Unexpected error %s", err.Error())
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}
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}
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func TestGetIPInvalidResponse(t *testing.T) {
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t.Parallel()
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mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusOK)
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w.Write([]byte("toto"))
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}))
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defer mockSrv.Close()
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clt := IPGetter{
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httpClt: mockSrv.Client(),
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remoteAddress: mockSrv.URL,
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timeout: 1 * time.Second,
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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_, err := clt.GetCurrentPublicIP(ctx)
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if err == nil {
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t.Fatal("Unexpected nil error")
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} else if err.Error() != `got an invalid public IP "toto"` {
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t.Fatalf("Unexpected error %s", err.Error())
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}
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}
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func TestGetIPTimeout(t *testing.T) {
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t.Parallel()
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mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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time.Sleep(100 * time.Millisecond)
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w.WriteHeader(http.StatusOK)
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w.Write([]byte("toto"))
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}))
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defer mockSrv.Close()
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clt := IPGetter{
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httpClt: mockSrv.Client(),
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remoteAddress: mockSrv.URL,
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timeout: 1 * time.Millisecond,
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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_, err := clt.GetCurrentPublicIP(ctx)
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if err == nil {
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t.Fatal("Unexpected nil error")
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} else if !strings.Contains(err.Error(), "context deadline exceeded") {
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t.Fatalf("Unexpected error %s", err.Error())
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}
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}
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