Mainflux.mainflux/readers/cassandra/setup_test.go

package cassandra_test

import (
	"fmt"
	"os"
	"testing"

	"github.com/gocql/gocql"
	log "github.com/mainflux/mainflux/logger"
	"github.com/mainflux/mainflux/writers/cassandra"
	dockertest "gopkg.in/ory-am/dockertest.v3"
)

var logger = log.New(os.Stdout)

func TestMain(m *testing.M) {
	pool, err := dockertest.NewPool("")
	if err != nil {
		logger.Error(fmt.Sprintf("Could not connect to docker: %s", err))
	}

	container, err := pool.Run("cassandra", "3.11.2", []string{})
	if err != nil {
		logger.Error(fmt.Sprintf("Could not start container: %s", err))
	}

	port := container.GetPort("9042/tcp")
	addr = fmt.Sprintf("%s:%s", addr, port)

	err = pool.Retry(func() error {
		if err := createKeyspace([]string{addr}); err != nil {
			return err
		}

		session, err := cassandra.Connect([]string{addr}, keyspace)
		if err != nil {
			return err
		}
		defer session.Close()

		return nil
	})

	if err != nil {
		logger.Error(fmt.Sprintf("Could not connect to docker: %s", err))
		os.Exit(1)
	}

	code := m.Run()

	if err := pool.Purge(container); err != nil {
		logger.Error(fmt.Sprintf("Could not purge container: %s", err))
	}

	os.Exit(code)
}

func createKeyspace(hosts []string) error {
	cluster := gocql.NewCluster(hosts...)
	cluster.Consistency = gocql.Quorum

	session, err := cluster.CreateSession()
	if err != nil {
		return err
	}
	defer session.Close()

	keyspaceCQL := fmt.Sprintf(`CREATE KEYSPACE IF NOT EXISTS %s WITH replication =
                   {'class':'SimpleStrategy','replication_factor':'1'}`, keyspace)

	return session.Query(keyspaceCQL).Exec()
}