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mockserver.go
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mockserver.go
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// Copyright 2018 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 mockserver
import (
"context"
"fmt"
"io/ioutil"
"net"
"os"
"sync"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"google.golang.org/grpc"
"google.golang.org/grpc/resolver"
)
// MockServer provides a mocked out grpc server of the etcdserver interface.
type MockServer struct {
ln net.Listener
Network string
Address string
GrpcServer *grpc.Server
}
func (ms *MockServer) ResolverAddress() resolver.Address {
switch ms.Network {
case "unix":
return resolver.Address{Addr: fmt.Sprintf("unix://%s", ms.Address)}
case "tcp":
return resolver.Address{Addr: ms.Address}
default:
panic("illegal network type: " + ms.Network)
}
}
// MockServers provides a cluster of mocket out gprc servers of the etcdserver interface.
type MockServers struct {
mu sync.RWMutex
Servers []*MockServer
wg sync.WaitGroup
}
// StartMockServers creates the desired count of mock servers
// and starts them.
func StartMockServers(count int) (ms *MockServers, err error) {
return StartMockServersOnNetwork(count, "tcp")
}
// StartMockServersOnNetwork creates mock servers on either 'tcp' or 'unix' sockets.
func StartMockServersOnNetwork(count int, network string) (ms *MockServers, err error) {
switch network {
case "tcp":
return startMockServersTcp(count)
case "unix":
return startMockServersUnix(count)
default:
return nil, fmt.Errorf("unsupported network type: %s", network)
}
}
func startMockServersTcp(count int) (ms *MockServers, err error) {
addrs := make([]string, 0, count)
for i := 0; i < count; i++ {
addrs = append(addrs, "localhost:0")
}
return startMockServers("tcp", addrs)
}
func startMockServersUnix(count int) (ms *MockServers, err error) {
dir := os.TempDir()
addrs := make([]string, 0, count)
for i := 0; i < count; i++ {
f, err := ioutil.TempFile(dir, "etcd-unix-so-")
if err != nil {
return nil, fmt.Errorf("failed to allocate temp file for unix socket: %v", err)
}
fn := f.Name()
err = os.Remove(fn)
if err != nil {
return nil, fmt.Errorf("failed to remove temp file before creating unix socket: %v", err)
}
addrs = append(addrs, fn)
}
return startMockServers("unix", addrs)
}
func startMockServers(network string, addrs []string) (ms *MockServers, err error) {
ms = &MockServers{
Servers: make([]*MockServer, len(addrs)),
wg: sync.WaitGroup{},
}
defer func() {
if err != nil {
ms.Stop()
}
}()
for idx, addr := range addrs {
ln, err := net.Listen(network, addr)
if err != nil {
return nil, fmt.Errorf("failed to listen %v", err)
}
ms.Servers[idx] = &MockServer{ln: ln, Network: network, Address: ln.Addr().String()}
ms.StartAt(idx)
}
return ms, nil
}
// StartAt restarts mock server at given index.
func (ms *MockServers) StartAt(idx int) (err error) {
ms.mu.Lock()
defer ms.mu.Unlock()
if ms.Servers[idx].ln == nil {
ms.Servers[idx].ln, err = net.Listen(ms.Servers[idx].Network, ms.Servers[idx].Address)
if err != nil {
return fmt.Errorf("failed to listen %v", err)
}
}
svr := grpc.NewServer()
pb.RegisterKVServer(svr, &mockKVServer{})
ms.Servers[idx].GrpcServer = svr
ms.wg.Add(1)
go func(svr *grpc.Server, l net.Listener) {
svr.Serve(l)
}(ms.Servers[idx].GrpcServer, ms.Servers[idx].ln)
return nil
}
// StopAt stops mock server at given index.
func (ms *MockServers) StopAt(idx int) {
ms.mu.Lock()
defer ms.mu.Unlock()
if ms.Servers[idx].ln == nil {
return
}
ms.Servers[idx].GrpcServer.Stop()
ms.Servers[idx].GrpcServer = nil
ms.Servers[idx].ln = nil
ms.wg.Done()
}
// Stop stops the mock server, immediately closing all open connections and listeners.
func (ms *MockServers) Stop() {
for idx := range ms.Servers {
ms.StopAt(idx)
}
ms.wg.Wait()
}
type mockKVServer struct{}
func (m *mockKVServer) Range(context.Context, *pb.RangeRequest) (*pb.RangeResponse, error) {
return &pb.RangeResponse{}, nil
}
func (m *mockKVServer) Put(context.Context, *pb.PutRequest) (*pb.PutResponse, error) {
return &pb.PutResponse{}, nil
}
func (m *mockKVServer) DeleteRange(context.Context, *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, error) {
return &pb.DeleteRangeResponse{}, nil
}
func (m *mockKVServer) Txn(context.Context, *pb.TxnRequest) (*pb.TxnResponse, error) {
return &pb.TxnResponse{}, nil
}
func (m *mockKVServer) Compact(context.Context, *pb.CompactionRequest) (*pb.CompactionResponse, error) {
return &pb.CompactionResponse{}, nil
}