Use custom limiter

go.mod

@@ -7,7 +7,6 @@ require (
 	github.com/stretchr/testify v1.7.1
 	go.uber.org/zap v1.21.0
 	golang.org/x/net v0.0.0-20220526153639-5463443f8c37
-	golang.org/x/time v0.0.0-20220411224347-583f2d630306
 	gopkg.in/yaml.v3 v3.0.1
 )
 

go.sum

@@ -48,8 +48,6 @@ golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/time v0.0.0-20220411224347-583f2d630306 h1:+gHMid33q6pen7kv9xvT+JRinntgeXO2AeZVd0AWD3w=
-golang.org/x/time v0.0.0-20220411224347-583f2d630306/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=

limiter/limiter.go

@@ -0,0 +1,47 @@
+package limiter
+
+import (
+	"sync"
+	"time"
+)
+
+type Limiter interface {
+	Wait()
+}
+
+type limiter struct {
+	tick    time.Duration
+	count   uint
+	entries []time.Time
+	index   uint
+	mutex   sync.Mutex
+}
+
+func NewLimiter(tick time.Duration, count uint) Limiter {
+	l := limiter{
+		tick:  tick,
+		count: count,
+		index: 0,
+	}
+	l.entries = make([]time.Time, count)
+	before := time.Now().Add(-2 * tick)
+	for i, _ := range l.entries {
+		l.entries[i] = before
+	}
+	return &l
+}
+func (l *limiter) Wait() {
+	l.mutex.Lock()
+	defer l.mutex.Unlock()
+	last := &l.entries[l.index]
+	next := last.Add(l.tick)
+	now := time.Now()
+	if now.Before(next) {
+		time.Sleep(next.Sub(now))
+	}
+	*last = time.Now()
+	l.index = l.index + 1
+	if l.index == l.count {
+		l.index = 0
+	}
+}

telegram/telegram.go

@@ -2,7 +2,6 @@ package telegram
 
 import (
 	"bytes"
-	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -11,8 +10,8 @@ import (
 	"net/url"
 	"time"
 
+	"go.balki.me/tss/limiter"
 	"go.balki.me/tss/log"
-	"golang.org/x/time/rate"
 )
 
 type TelegramSender interface {
@@ -22,8 +21,8 @@ type TelegramSender interface {
 type telegramSender struct {
 	client            *http.Client
 	authToken         string
-	rateLimiterPerMin *rate.Limiter
-	rateLimiterPerSec *rate.Limiter
+	rateLimiterPerMin limiter.Limiter
+	rateLimiterPerSec limiter.Limiter
 }
 
 func (ts *telegramSender) SendLink(link, channel, rhash, title string) error {
@@ -47,15 +46,8 @@ func (ts *telegramSender) SendLink(link, channel, rhash, title string) error {
 
 	apiUrl := fmt.Sprintf("https://api.telegram.org/bot%s/sendMessage", ts.authToken)
 
-	err = ts.rateLimiterPerMin.Wait(context.TODO())
-	if err != nil {
-		return err
-	}
-
-	err = ts.rateLimiterPerSec.Wait(context.TODO())
-	if err != nil {
-		return err
-	}
+	ts.rateLimiterPerMin.Wait()
+	ts.rateLimiterPerSec.Wait()
 
 	res, err := ts.client.Post(apiUrl, "application/json", bytes.NewReader(data))
 	if err != nil {
@@ -79,9 +71,9 @@ func NewTelegramSender(transport http.RoundTripper, authToken string) TelegramSe
 		client:    &http.Client{Transport: transport},
 		authToken: authToken,
 		// 20 requests per min with some buffer
-		rateLimiterPerMin: rate.NewLimiter(rate.Every(65*time.Second), 20),
+		rateLimiterPerMin: limiter.NewLimiter(65*time.Second, 20),
 		// 1 msg per sec with some buffer
-		rateLimiterPerSec: rate.NewLimiter(rate.Every(1050*time.Millisecond), 1),
+		rateLimiterPerSec: limiter.NewLimiter(1050*time.Millisecond, 1),
 	}
 }