102 lines
2.0 KiB
Go
102 lines
2.0 KiB
Go
package reader
|
|
|
|
import (
|
|
"context"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/sirupsen/logrus"
|
|
"src.dualinventive.com/go/dinet"
|
|
)
|
|
|
|
// MessageReader reads incomming messages from a pubsub connection and send the messages to Influx
|
|
type MessageReader struct {
|
|
mu sync.Mutex
|
|
|
|
pubsub dinet.Conn
|
|
w dinet.Writer
|
|
}
|
|
|
|
// New creates a new message reader
|
|
func New(pubSubURI string, w dinet.Writer) (*MessageReader, error) {
|
|
con, err := dinet.NewConn(dinet.TransportZmq)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
err = con.Connect(pubSubURI + "?type=sub")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
reader := &MessageReader{}
|
|
reader.pubsub = con
|
|
reader.w = w
|
|
|
|
return reader, err
|
|
}
|
|
|
|
// Serve reads incomming messages from a pubsub connection and send the messages to Redis
|
|
func (r *MessageReader) Serve(ctx context.Context) {
|
|
var wg sync.WaitGroup
|
|
// Wait until the goroutine ends
|
|
defer wg.Wait()
|
|
|
|
wg.Add(1)
|
|
go func() {
|
|
defer wg.Done()
|
|
<-ctx.Done()
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if err := r.pubsub.Close(); err != nil {
|
|
logrus.Error("Unable to close pub sub connection:", err)
|
|
}
|
|
}()
|
|
|
|
for {
|
|
if ctx.Err() != nil {
|
|
logrus.Infof("reader context error: %v", ctx.Err())
|
|
return
|
|
}
|
|
// Receive messages from the reader connection
|
|
msg, err := r.pubsub.Recv()
|
|
if err != nil {
|
|
if err == dinet.ErrDisconnected {
|
|
logrus.Warn("Reconnecting due to error:", err)
|
|
} else {
|
|
logrus.Error("Unable to receive publish message due to:", err)
|
|
}
|
|
r.reconnect(ctx)
|
|
continue
|
|
}
|
|
|
|
if err := r.w.Send(msg); err != nil {
|
|
logrus.Warn("Send error: ", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (r *MessageReader) reconnect(ctx context.Context) {
|
|
select {
|
|
case <-ctx.Done():
|
|
// Do not reconnect when the context is closed
|
|
return
|
|
default:
|
|
}
|
|
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
// Try to reconnect
|
|
for err := r.pubsub.Reconnect(); err != nil; err = r.pubsub.Reconnect() {
|
|
select {
|
|
case <-ctx.Done():
|
|
// Do not reconnect when the context is closed
|
|
return
|
|
default:
|
|
}
|
|
|
|
logrus.Warn("Reconnect error: ", err)
|
|
time.Sleep(100 * time.Millisecond)
|
|
}
|
|
}
|