/
docker.go
78 lines (66 loc) · 1.51 KB
/
docker.go
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package testutils // import "lib.hemtjan.st/testutils"
import (
"fmt"
"log"
"github.com/goiiot/libmqtt"
"github.com/ory/dockertest"
)
type dummyMqtt struct {
initCh chan error
}
// onConnect handler
func (d *dummyMqtt) onConnect(server string, code byte, err error) {
if code != libmqtt.CodeSuccess && err == nil {
err = fmt.Errorf("error code %d", int(code))
}
if d.initCh != nil {
if err != nil {
d.initCh <- err
} else {
close(d.initCh)
}
}
}
// mqttBroker starts an MQTT broker using Docker
// It returns a host:port string as well as a cleanup function that you can defer
func MQTTBroker() (string, func()) {
pool, err := dockertest.NewPool("")
if err != nil {
log.Fatalf("Could not connect to docker: %s", err)
}
resource, err := pool.Run("ansi/mosquitto", "latest", nil)
if err != nil {
log.Fatalf("Could not start resource: %s", err)
}
host := resource.GetHostPort("1883/tcp")
if host == "" {
log.Fatalf("Empty host")
}
if err := pool.Retry(func() error {
client, err := libmqtt.NewClient(
libmqtt.WithServer(host),
libmqtt.WithDialTimeout(1),
)
if err != nil {
log.Fatal(err)
}
d := &dummyMqtt{
initCh: make(chan error),
}
client.Connect(d.onConnect)
err, _ = <-d.initCh
d.initCh = nil
if err != nil {
client.Destroy(true)
return err
}
return nil
}); err != nil {
log.Fatalf("Could not connect to MQTT: %s", err)
}
return host, func() {
if err := pool.Purge(resource); err != nil {
log.Printf("Could not purge resource: %s", err)
}
}
}