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| 1 | +/* |
| 2 | +Copyright 2021 The Dapr Authors |
| 3 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +you may not use this file except in compliance with the License. |
| 5 | +You may obtain a copy of the License at |
| 6 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | +Unless required by applicable law or agreed to in writing, software |
| 8 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 9 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 10 | +See the License for the specific language governing permissions and |
| 11 | +limitations under the License. |
| 12 | +*/ |
| 13 | + |
| 14 | +package client |
| 15 | + |
| 16 | +import ( |
| 17 | + "context" |
| 18 | + "net" |
| 19 | + "os" |
| 20 | + "sync/atomic" |
| 21 | + "testing" |
| 22 | + "time" |
| 23 | + |
| 24 | + "github.com/stretchr/testify/assert" |
| 25 | + "google.golang.org/grpc" |
| 26 | + "google.golang.org/grpc/credentials/insecure" |
| 27 | +) |
| 28 | + |
| 29 | +const ( |
| 30 | + unresponsiveServerHost = "127.0.0.1" |
| 31 | + unresponsiveTCPPort = "0" // Port set to 0 so O.S. auto-selects one for us |
| 32 | + unresponsiveUnixSocketFilePath = "/tmp/unresponsive-server.socket" |
| 33 | + |
| 34 | + waitTimeout = 5 * time.Second |
| 35 | + connectionTimeout = 4 * waitTimeout // Larger than waitTimeout but still bounded |
| 36 | + autoCloseTimeout = 2 * connectionTimeout // Server will close connections after this |
| 37 | +) |
| 38 | + |
| 39 | +type Server struct { |
| 40 | + listener net.Listener |
| 41 | + address string |
| 42 | + done chan bool |
| 43 | + nClientsSeen uint64 |
| 44 | +} |
| 45 | + |
| 46 | +func (s *Server) Close() { |
| 47 | + close(s.done) |
| 48 | + if err := s.listener.Close(); err != nil { |
| 49 | + logger.Fatal(err) |
| 50 | + } |
| 51 | + os.Remove(unresponsiveUnixSocketFilePath) |
| 52 | +} |
| 53 | + |
| 54 | +func (s *Server) listenButKeepSilent() { |
| 55 | + for { |
| 56 | + conn, err := s.listener.Accept() // Accept connections but that's it! |
| 57 | + if err != nil { |
| 58 | + select { |
| 59 | + case <-s.done: |
| 60 | + return |
| 61 | + default: |
| 62 | + logger.Fatal(err) |
| 63 | + break |
| 64 | + } |
| 65 | + } else { |
| 66 | + go func(conn net.Conn) { |
| 67 | + atomic.AddUint64(&s.nClientsSeen, 1) |
| 68 | + time.Sleep(autoCloseTimeout) |
| 69 | + conn.Close() |
| 70 | + }(conn) |
| 71 | + } |
| 72 | + } |
| 73 | +} |
| 74 | + |
| 75 | +func createUnresponsiveTCPServer() (*Server, error) { |
| 76 | + return createUnresponsiveServer("tcp", net.JoinHostPort(unresponsiveServerHost, unresponsiveTCPPort)) |
| 77 | +} |
| 78 | + |
| 79 | +func createUnresponsiveUnixServer() (*Server, error) { |
| 80 | + return createUnresponsiveServer("unix", unresponsiveUnixSocketFilePath) |
| 81 | +} |
| 82 | + |
| 83 | +func createUnresponsiveServer(network string, unresponsiveServerAddress string) (*Server, error) { |
| 84 | + serverListener, err := net.Listen(network, unresponsiveServerAddress) |
| 85 | + if err != nil { |
| 86 | + logger.Fatalf("Creation of test server on network %s and address %s failed with error: %v", |
| 87 | + network, unresponsiveServerAddress, err) |
| 88 | + return nil, err |
| 89 | + } |
| 90 | + |
| 91 | + server := &Server{ |
| 92 | + listener: serverListener, |
| 93 | + address: serverListener.Addr().String(), |
| 94 | + done: make(chan bool), |
| 95 | + nClientsSeen: 0, |
| 96 | + } |
| 97 | + |
| 98 | + go server.listenButKeepSilent() |
| 99 | + |
| 100 | + return server, nil |
| 101 | +} |
| 102 | + |
| 103 | +func createNonBlockingClient(ctx context.Context, serverAddr string) (client Client, err error) { |
| 104 | + conn, err := grpc.DialContext( |
| 105 | + ctx, |
| 106 | + serverAddr, |
| 107 | + grpc.WithTransportCredentials(insecure.NewCredentials()), |
| 108 | + ) |
| 109 | + if err != nil { |
| 110 | + logger.Fatal(err) |
| 111 | + return nil, err |
| 112 | + } |
| 113 | + return NewClientWithConnection(conn), nil |
| 114 | +} |
| 115 | + |
| 116 | +func TestGrpcWaitHappyCase(t *testing.T) { |
| 117 | + ctx := context.Background() |
| 118 | + |
| 119 | + err := testClient.Wait(ctx, waitTimeout) |
| 120 | + assert.NoError(t, err) |
| 121 | +} |
| 122 | + |
| 123 | +func TestGrpcWaitUnresponsiveTcpServer(t *testing.T) { |
| 124 | + ctx := context.Background() |
| 125 | + |
| 126 | + server, err := createUnresponsiveTCPServer() |
| 127 | + assert.NoError(t, err) |
| 128 | + defer server.Close() |
| 129 | + |
| 130 | + clientConnectionTimeoutCtx, cancel := context.WithTimeout(ctx, connectionTimeout) |
| 131 | + defer cancel() |
| 132 | + client, err := createNonBlockingClient(clientConnectionTimeoutCtx, server.address) |
| 133 | + assert.NoError(t, err) |
| 134 | + |
| 135 | + err = client.Wait(ctx, waitTimeout) |
| 136 | + assert.Error(t, err) |
| 137 | + assert.Equal(t, errWaitTimedOut, err) |
| 138 | + assert.Equal(t, uint64(1), atomic.LoadUint64(&server.nClientsSeen)) |
| 139 | +} |
| 140 | + |
| 141 | +func TestGrpcWaitUnresponsiveUnixServer(t *testing.T) { |
| 142 | + ctx := context.Background() |
| 143 | + |
| 144 | + server, err := createUnresponsiveUnixServer() |
| 145 | + assert.NoError(t, err) |
| 146 | + defer server.Close() |
| 147 | + |
| 148 | + clientConnectionTimeoutCtx, cancel := context.WithTimeout(ctx, connectionTimeout) |
| 149 | + defer cancel() |
| 150 | + client, err := createNonBlockingClient(clientConnectionTimeoutCtx, "unix://"+server.address) |
| 151 | + assert.NoError(t, err) |
| 152 | + |
| 153 | + err = client.Wait(ctx, waitTimeout) |
| 154 | + assert.Error(t, err) |
| 155 | + assert.Equal(t, errWaitTimedOut, err) |
| 156 | + assert.Equal(t, uint64(1), atomic.LoadUint64(&server.nClientsSeen)) |
| 157 | +} |
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