Protobuf events production and consumption.
This library was designed only with protobuf messages in mind but it has []byte
interfaces so any format is pluggable.
We are shipping with protoc-gen-go with builtin evpb plugin.
Protobuf messages do not have to be changed for this to work,
but You can use our protoc-gen-go generator like in example Makefile
to generate a static typed consumer and sender functions.
package main
import (
"log"
"os"
"os/signal"
"time"
"github.com/crackcomm/evpb/nsqpb"
pb "github.com/crackcomm/evpb/example/pb"
)
func consumer(movie *pb.Movie) (err error) {
log.Printf("title=%q year=%d", movie.Title, movie.Year)
return
}
func main() {
// Create new NSQ consumer with default nsq addr
queue := nsqpb.New(
nsqpb.WithAddrs("127.0.0.1:4150"),
)
// Register movies consumer
// without generating: would need a type casting
if err := pb.ConsumeMovie(queue, consumer); err != nil {
log.Fatal(err)
}
// Start sending movies to NSQ
go func() {
for range time.Tick(500 * time.Millisecond) {
// without generating: evpb.Send(queue, &pb.Movie{...})
// would need to lookup topic name by reflected type
if err := pb.SendMovie(queue, &pb.Movie{
Title: "Pulp Fiction",
Year: 1994,
}); err != nil {
log.Fatal(err)
}
}
}()
// Wait for interrupt signal
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt)
<-sig
}$ go get -u github.com/gogo/protobuf/...
$ go get -u github.com/crackcomm/evpb/protoc-gen-goevpb$ protoc -I${GOPATH}/src \
--goevpb_out=plugins=evpb:${GOPATH}/src \
${GOPATH}/src/${REPO}/example/pb/messages.proto- nsq
- channels (in-memory)
- http