github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/cdc/kv/grpc_pool_impl_test.go (about)

     1  // Copyright 2021 PingCAP, Inc.
     2  //
     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  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package kv
    15  
    16  import (
    17  	"context"
    18  	"testing"
    19  
    20  	"github.com/pingcap/tiflow/pkg/security"
    21  	"github.com/stretchr/testify/require"
    22  )
    23  
    24  // Use clientSuite for some special reasons, the embed etcd uses zap as the only candidate
    25  // logger and in the logger initialization it also initializes the grpclog/loggerv2, which
    26  // is not a thread-safe operation and it must be called before any gRPC functions
    27  // ref: https://github.com/grpc/grpc-go/blob/master/grpclog/loggerv2.go#L67-L72
    28  func TestConnArray(t *testing.T) {
    29  	t.Parallel()
    30  
    31  	ctx, cancel := context.WithCancel(context.Background())
    32  	defer cancel()
    33  
    34  	pool := NewGrpcPoolImpl(ctx, &security.Credential{})
    35  	defer pool.Close()
    36  	addr := "127.0.0.1:20161"
    37  	conn, err := pool.GetConn(addr)
    38  	require.Nil(t, err)
    39  	require.Equal(t, int64(1), conn.active)
    40  	pool.ReleaseConn(conn, addr)
    41  	require.Equal(t, int64(0), conn.active)
    42  
    43  	lastConn := conn
    44  	// First grpcConnCapacity*2 connections will use initial two connections.
    45  	for i := 0; i < grpcConnCapacity*2; i++ {
    46  		conn, err := pool.GetConn(addr)
    47  		require.Nil(t, err)
    48  		require.NotSame(t, conn.ClientConn, lastConn.ClientConn)
    49  		require.Equal(t, int64(i)/2+1, conn.active)
    50  		lastConn = conn
    51  	}
    52  	// The following grpcConnCapacity*2 connections will trigger resize of connection array.
    53  	for i := 0; i < grpcConnCapacity*2; i++ {
    54  		conn, err := pool.GetConn(addr)
    55  		require.Nil(t, err)
    56  		require.NotSame(t, conn.ClientConn, lastConn.ClientConn)
    57  		require.Equal(t, int64(i)/2+1, conn.active)
    58  		lastConn = conn
    59  	}
    60  }
    61  
    62  func TestConnArrayRecycle(t *testing.T) {
    63  	t.Parallel()
    64  
    65  	ctx, cancel := context.WithCancel(context.Background())
    66  	defer cancel()
    67  
    68  	pool := NewGrpcPoolImpl(ctx, &security.Credential{})
    69  	defer pool.Close()
    70  	addr := "127.0.0.1:20161"
    71  
    72  	bucket := 6
    73  	// sharedConns will store SharedConn with the same index according to connArray bucket.
    74  	sharedConns := make([]*sharedConn, bucket)
    75  	// get conn for 6000 times, and grpc pool will create 6 buckets
    76  	for i := 0; i < grpcConnCapacity*bucket; i++ {
    77  		conn, err := pool.GetConn(addr)
    78  		require.Nil(t, err)
    79  		if i%(grpcConnCapacity*resizeBucketStep) == 0 {
    80  			sharedConns[i/grpcConnCapacity] = conn
    81  		}
    82  		if i%(grpcConnCapacity*resizeBucketStep) == 1 {
    83  			sharedConns[i/grpcConnCapacity+1] = conn
    84  		}
    85  	}
    86  	for i := 2; i < bucket; i++ {
    87  		require.Equal(t, int64(grpcConnCapacity), sharedConns[i].active)
    88  		for j := 0; j < grpcConnCapacity; j++ {
    89  			pool.ReleaseConn(sharedConns[i], addr)
    90  		}
    91  	}
    92  	empty := pool.bucketConns[addr].recycle()
    93  	require.False(t, empty)
    94  	require.Len(t, pool.bucketConns[addr].conns, 2)
    95  
    96  	for i := 0; i < 2; i++ {
    97  		require.Equal(t, int64(grpcConnCapacity), sharedConns[i].active)
    98  		for j := 0; j < grpcConnCapacity; j++ {
    99  			pool.ReleaseConn(sharedConns[i], addr)
   100  		}
   101  	}
   102  	empty = pool.bucketConns[addr].recycle()
   103  	require.True(t, empty)
   104  	require.Len(t, pool.bucketConns[addr].conns, 0)
   105  }