etcd/tests/integration/clientv3/naming/resolver_test.go
Piotr Tabor 5d7c1db3a9 Introduce grpc-1.30+ compatible client/v3/naming API.
This is not yet implementation, just API and tests to be filled
with implementation in next CLs,
tracked by: https://github.com/etcd-io/etcd/issues/12652

We propose here 3 packages:
 - clientv3/naming/endpoints ->
    That is abstraction layer over etcd that allows to write, read &
    watch Endpoints information. It's independent from GRPC API. It hides
    the storage details.

 - clientv3/naming/endpoints/internal ->
    That contains the grpc's compatible Update class to preserve the
    internal JSON mashalling format.

 - clientv3/naming/resolver ->
   That implements the GRPC resolver API, such that etcd can be
   used for connection.Dial in grpc.

Please see the grpc_naming.md document changes & grpcproxy/cluster.go
new integration, to see how the new abstractions work.
2021-01-30 12:32:19 +01:00

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Go

// Copyright 2016 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package naming_test
import (
"context"
"testing"
"go.etcd.io/etcd/client/v3/naming/endpoints"
"go.etcd.io/etcd/client/v3/naming/resolver"
"google.golang.org/grpc"
"go.etcd.io/etcd/pkg/v3/testutil"
"go.etcd.io/etcd/tests/v3/integration"
)
// This test mimics scenario described in grpc_naming.md doc.
func TestEtcdGrpcResolver(t *testing.T) {
t.Skip("Not implemented yet")
defer testutil.AfterTest(t)
// s1 := // TODO: Dummy GRPC service listening on 127.0.0.1:20000
// s2 := // TODO: Dummy GRPC service listening on 127.0.0.1:20001
clus := integration.NewClusterV3(t, &integration.ClusterConfig{Size: 1})
defer clus.Terminate(t)
em, err := endpoints.NewManager(clus.RandClient(), "foo")
if err != nil {
t.Fatal("failed to create EndpointManager", err)
}
e1 := endpoints.Endpoint{Addr: "127.0.0.1:20000"}
e2 := endpoints.Endpoint{Addr: "127.0.0.1:20001"}
err = em.AddEndpoint(context.TODO(), "foo/e1", e1)
if err != nil {
t.Fatal("failed to add foo", err)
}
etcdResolver, err := resolver.NewBuilder(clus.RandClient())
conn, err := grpc.Dial("etc://foo", grpc.WithResolvers(etcdResolver))
if err != nil {
t.Fatal("failed to connect to foo (e1)", err)
}
// TODO: send requests to conn, ensure s1 received it.
em.DeleteEndpoint(context.TODO(), "foo/e1")
em.AddEndpoint(context.TODO(), "foo/e2", e2)
// TODO: Send requests to conn and make sure s2 receive it.
// Might require restarting s1 to break the existing (open) connection.
conn.GetState() // this line is to avoid compiler warning that conn is unused.
}