/
connect.go
99 lines (81 loc) · 2.1 KB
/
connect.go
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package interconnect
import (
"context"
"fmt"
"io"
"log"
"os"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/encoding/gzip"
nats "github.com/nats-io/nats.go"
"github.com/spf13/viper"
event "github.com/tcfw/evntsrc/internal/event/protos"
pb "github.com/tcfw/evntsrc/internal/interconnect/protos"
"google.golang.org/grpc"
)
//Connect connects to a remote endpoint
func Connect(endpoint string, nats string) error {
cert := viper.GetString("certificate")
if _, err := os.Stat(cert); os.IsNotExist(err) {
return fmt.Errorf("Certificate not found: %s", err.Error())
}
creds, err := credentials.NewClientTLSFromFile(cert, "")
if err != nil {
return err
}
log.Printf("Starting interconnect client: region: %s: remote: %s", viper.GetString("region"), endpoint)
conn, err := grpc.Dial(endpoint, grpc.WithTransportCredentials(creds))
if err != nil {
return fmt.Errorf("Failed to connect to remote: %s", err.Error())
}
client := pb.NewInterconnectServiceClient(conn)
stream, err := client.Relay(context.Background(), grpc.UseCompressor(gzip.Name))
if err != nil {
return fmt.Errorf("Failed to start relay: %s", err.Error())
}
return startRelay(stream, nats)
}
func startRelay(stream pb.InterconnectService_RelayClient, natsEndpoint string) error {
log.Println("Opening relay [LOCAL]...")
toRelay := make(chan *event.Event, 1000)
closed := false
nc, err := nats.Connect(natsEndpoint)
if err != nil {
return fmt.Errorf("Failed to connect to NATS: %s", err.Error())
}
rl := &relay{natsConn: nc}
writeClose, err := rl.WritePipe(toRelay)
if err != nil {
return err
}
go func() {
for {
ev, ok := <-toRelay
if !ok {
closed = true
break
}
stream.Send(&pb.ForwardingRequest{Event: ev})
}
}()
for {
if closed {
stream.CloseSend()
return nil
}
forwardedEventReq, err := stream.Recv()
if err == io.EOF {
log.Println("Closing relay [LOCAL]...")
stream.CloseSend()
return nil
}
if err != nil {
close(writeClose)
return err
}
if err := rl.publishedForwarded(forwardedEventReq); err != nil {
close(writeClose)
return err
}
}
}