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package common
/*
Message represents a protocol-agnostic message.
*/
type Message struct {
ID string `json:"id"`
Protocol string `json:"protocol"`
ReplyTo string `json:"replyto"`
Via string `json:"via"` // uuid of the service to send this to
Body string `json:"body"`
BodyParams map[string]interface{} `json:"bodyparams"`
Sender string `json:"sender"`
SenderParams map[string]interface{} `json:"senderparams"`
Destination string `json:"destination"`
DestinationParams map[string]interface{} `json:"destinationparams"`
Kind string `json:"kind"`
Metadata map[string]interface{} `json:"metadata"`
Incoming bool `json:"incoming"`
}
/*
Birth is what a service sends when it first comes alive.
*/
type Birth struct {
ID string `json:"id"` // Also functions as a ping-channel
EventKinds []string `json:"kinds"`
}

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package common
import (
"io"
"log"
"os"
"runtime"
"github.com/Xe/uuid"
"github.com/namsral/flag"
"github.com/nats-io/nats"
)
var (
natsServer = flag.String("nats-url", "nats://127.0.0.1:4242", "where to connect to for nats")
)
// Uplink to the hive
type Uplink struct {
*nats.EncodedConn
*log.Logger
Nats *nats.Conn
ID string
}
// Connect just connects you to nats, no fuss.
func Connect() (*Uplink, error) {
nc, err := nats.Connect(*natsServer)
if err != nil {
return nil, err
}
c, err := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
if err != nil {
return nil, err
}
runtime.SetFinalizer(nc, autoclose)
runtime.SetFinalizer(c, autoclose)
id := uuid.New()
u := &Uplink{
EncodedConn: c,
Logger: log.New(os.Stdout, id+" ", log.LstdFlags),
ID: id,
Nats: nc,
}
_, err = c.Subscribe(u.ID+":ping", func(subj, reply string, msg string) {
c.Publish(reply, "pong")
})
if err != nil {
return nil, err
}
return u, nil
}
func autoclose(c io.Closer) {
if err := c.Close(); err != nil {
log.Printf("%v", err)
}
}