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Fix/retry nats connect #33

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Merged
AndreiShipov merged 2 commits into from
Nov 17, 2025
Merged

Fix/retry nats connect #33

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46857a7
add retries for NATS connect
atauov Nov 13, 2025
c42fbe5
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atauov Nov 13, 2025
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27 changes: 20 additions & 7 deletions statefun/runtime.go
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Original file line number Diff line number Diff line change
Expand Up @@ -52,17 +52,30 @@ func NewRuntime(config RuntimeConfig) (*Runtime, error) {
shutdown: make(chan struct{}),
}

var err error
natsOpts := nats.GetDefaultOptions()
natsOpts.Url = r.config.natsURL
natsOpts.MaxReconnect = -1 // -1 - infinity attempts
natsOpts.ReconnectedCB = func(nc *nats.Conn) {
lg.GetLogger().Warnf(context.TODO(), "NATS reconnected %d times", nc.Statistics.Reconnects)
}

if r.config.enableTLS {
opts := []nats.Option{
nats.Secure(&tls.Config{InsecureSkipVerify: true}), // for self-assigned certificates
}
r.nc, err = nats.Connect(config.natsURL, opts...)
} else {
r.nc, err = nats.Connect(config.natsURL)
natsOpts.Secure = true
natsOpts.TLSConfig = &tls.Config{InsecureSkipVerify: true} // for self-assigned certificates
}

var err error
maxAttempts := system.GetEnvMustProceed("RETRIES_NATS_CONNECT", 10)
for attempt := 1; attempt <= maxAttempts; attempt++ {
r.nc, err = natsOpts.Connect()
if err != nil && attempt < maxAttempts {
lg.GetLogger().Errorf(context.TODO(), "Can't connect to NATS at attempt %d/%d: %v", attempt, maxAttempts, err)
// Linear backoff: increase delay by 1 second on each attempt
time.Sleep(time.Duration(1+attempt) * time.Second)
} else {
break
}
}
if err != nil {
return nil, err
}
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