/
subscriber.go
133 lines (129 loc) · 4.34 KB
/
subscriber.go
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package nats_utils
import (
"fmt"
"log"
"runtime/debug"
"time"
"github.com/golang/snappy"
stan "github.com/nats-io/stan.go"
)
func (n *NatsStreamingService) RunSubscriber(config SubscriberConfig) error {
var opts []stan.SubscriptionOption
var sub stan.Subscription
var err error
switch config.StartType {
case StartWithLastReceived:
opts = append(opts, stan.StartWithLastReceived())
case DeliverAllAvailable:
opts = append(opts, stan.DeliverAllAvailable())
case StartAtSequence:
opts = append(opts, stan.StartAtSequence(uint64(*config.StartMsgPosition)))
case StartAtTime:
opts = append(opts, stan.StartAtTime(*config.StartTime))
}
if config.MaxInflight != nil {
opts = append(opts, stan.MaxInflight(*config.MaxInflight))
}
if config.AckWaitSeconds != nil {
opts = append(opts, stan.AckWait(time.Duration(*config.AckWaitSeconds)*time.Second))
}
if config.DurableName != nil {
opts = append(opts, stan.DurableName(*config.DurableName))
}
if config.Type == ClassicSubscribe {
sub, err = n.conn.Subscribe(*config.ChannelName, func(m *stan.Msg) {
var err error
if n.configs.Compress {
m.Data, err = snappy.Decode(nil, m.Data)
}
if err != nil {
if n.configs.Logger != nil {
n.configs.Logger.Printf("nats_:_Subscribe_:_[channel: %s] error: %v, stack: %s\n", *config.ChannelName, err, string(debug.Stack()))
} else {
log.Printf("nats_:_Subscribe_:_[channel: %s] error: %v, stack: %s\n", *config.ChannelName, err, string(debug.Stack()))
}
return
}
if config.MsgHandler != nil {
// client function...
config.MsgHandler(m)
}
if config.LastMsgStorage != nil {
err = config.LastMsgStorage.SaveLastMessageInfo(*config.ChannelName,
MsgSubInfo{
Subject: *config.ChannelName,
Sequence: uint(m.Sequence),
Time: time.Unix(0, m.Timestamp),
})
if err != nil {
if n.configs.Logger != nil {
n.configs.Logger.Printf("nats_:_Subscribe_:_[channel: %s] error: %v, stack: %s\n", *config.ChannelName, err, string(debug.Stack()))
} else {
log.Printf("nats_:_Subscribe_:_[channel: %s] error: %v, stack: %s\n", *config.ChannelName, err, string(debug.Stack()))
}
}
} else {
n.cache.Set(*config.ChannelName, MsgSubInfo{
Subject: *config.ChannelName,
Sequence: uint(m.Sequence),
Time: time.Unix(0, m.Timestamp),
}, -1)
}
if config.SubMsgChan != nil {
config.SubMsgChan.In() <- m.Data
}
}, opts...)
} else if config.Type == QueueSubscribe {
sub, err = n.conn.QueueSubscribe(*config.ChannelName, *config.QueueName, func(m *stan.Msg) {
var err error
if n.configs.Compress {
m.Data, err = snappy.Decode(nil, m.Data)
}
if err != nil {
if n.configs.Logger != nil {
n.configs.Logger.Printf("nats_:_QueueSubscribe_:_[channel: %s, queue: %s] error: %v, stack: %s\n", *config.ChannelName, *config.QueueName, err, string(debug.Stack()))
} else {
log.Printf("nats_:_QueueSubscribe_:_[channel: %s, queue: %s] error: %v, stack: %s\n", *config.ChannelName, *config.QueueName, err, string(debug.Stack()))
}
return
}
if config.MsgHandler != nil {
// client function...
config.MsgHandler(m)
}
if config.LastMsgStorage != nil {
err = config.LastMsgStorage.SaveLastMessageInfo(fmt.Sprintf("%s:%s", *config.ChannelName, *config.QueueName),
MsgSubInfo{
Subject: *config.ChannelName,
Queue: config.QueueName,
Sequence: uint(m.Sequence),
Time: time.Unix(0, m.Timestamp),
})
if err != nil {
if n.configs.Logger != nil {
n.configs.Logger.Printf("nats_:_QueueSubscribe_:_[channel: %s, queue: %s] error: %v, stack: %s\n", *config.ChannelName, *config.QueueName, err, string(debug.Stack()))
} else {
log.Printf("nats_:_QueueSubscribe_:_[channel: %s, queue: %s] error: %v, stack: %s\n", *config.ChannelName, *config.QueueName, err, string(debug.Stack()))
}
}
} else {
n.cache.Set(fmt.Sprintf("%s:%s", *config.ChannelName, *config.QueueName), MsgSubInfo{
Subject: *config.ChannelName,
Queue: config.QueueName,
Sequence: uint(m.Sequence),
Time: time.Unix(0, m.Timestamp),
}, -1)
}
if config.SubMsgChan != nil {
config.SubMsgChan.In() <- m.Data
}
}, opts...)
}
defer func() {
if config.UnsubscribeAfterSubscribeEnd {
sub.Unsubscribe()
config.SubMsgChan.Close()
}
}()
return err
}