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adding rate limiting to public client subscriptions, increasing subsc… #231

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4 changes: 4 additions & 0 deletions CHANGELOG
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Original file line number Diff line number Diff line change
@@ -1,3 +1,7 @@
3.0.4
- Features
- adding subscriptions rate limiting

3.0.3
- Features
- new websocket manager. Please refer to `/examples/ws` for usage examples.
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11 changes: 10 additions & 1 deletion pkg/mux/mux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,12 +5,18 @@ import (
"fmt"
"log"
"sync"
"time"

"github.com/bitfinexcom/bitfinex-api-go/pkg/models/event"
"github.com/bitfinexcom/bitfinex-api-go/pkg/mux/client"
"github.com/bitfinexcom/bitfinex-api-go/pkg/mux/msg"
)

const (
rateLimit = 60 * 1000 / 20 // 20 connections per minute
pubClientSubsLimit = 30
)

// Mux will manage all connections and subscriptions. Will check if subscriptions
// limit is reached and spawn new connection when that happens. It will also listen
// to all incomming client messages and reconnect client with all its subscriptions
Expand Down Expand Up @@ -105,6 +111,9 @@ func (m *Mux) Subscribe(sub event.Subscribe) *Mux {
m.mtx.Lock()
defer m.mtx.Unlock()

// make sure we don't hit the rate limit
time.Sleep(rateLimit * time.Millisecond)
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hmmm, thats not ideal for people that just use 1 or 5 subscriptions... takes a long time...

how about something that works also well for the many use cases where people have less than 20 connections?

maybe there is a lib for throttling in golang or something we can build with the mutexes we used elsewhere?


if subscribed := m.publicClients[m.cid].SubAdded(sub); subscribed {
return m
}
Expand Down Expand Up @@ -286,7 +295,7 @@ func (m *Mux) addPublicClient() *Mux {
c, err := client.
New().
WithID(m.cid).
WithSubsLimit(20).
WithSubsLimit(pubClientSubsLimit).
Public(m.publicURL)
if err != nil {
m.Err = err
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