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etcd.go
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etcd.go
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package etcd
import (
"fmt"
"runtime"
"strconv"
"github.com/ory/dockertest/v3"
etcd "go.etcd.io/etcd/client/v3"
"google.golang.org/grpc"
)
type cleaner interface {
Cleanup(func())
Log(...interface{})
}
type Resource struct {
Client *etcd.Client
Hosts []string
Port int
}
func Setup(pool *dockertest.Pool, cln cleaner) (*Resource, error) {
etcdImage := "bitnami/etcd"
if runtime.GOARCH == "arm64" {
etcdImage = "zcube/bitnami-compat-etcd"
}
container, err := pool.Run(etcdImage, "3.5", []string{
"ALLOW_NONE_AUTHENTICATION=yes",
})
if err != nil {
return nil, fmt.Errorf("could not create container: %v", err)
}
cln.Cleanup(func() {
if err := pool.Purge(container); err != nil {
cln.Log(fmt.Errorf("could not purge ETCD resource: %v", err))
}
})
var (
etcdClient *etcd.Client
etcdHosts []string
etcdPort int
etcdPortStr = container.GetPort("2379/tcp")
)
etcdPort, err = strconv.Atoi(etcdPortStr)
if err != nil {
return nil, fmt.Errorf("could not convert port %q to int: %v", etcdPortStr, err)
}
etcdHosts = []string{"http://localhost:" + etcdPortStr}
err = pool.Retry(func() (err error) {
etcdClient, err = etcd.New(etcd.Config{
Endpoints: etcdHosts,
DialOptions: []grpc.DialOption{
grpc.WithBlock(), // block until the underlying connection is up
},
})
return err
})
if err != nil {
return nil, fmt.Errorf("could not connect to dockerized ETCD: %v", err)
}
return &Resource{
Client: etcdClient,
Hosts: etcdHosts,
Port: etcdPort,
}, nil
}