Mac Docker环境，利用Canal实现MySQL同步ES

050

Canal的使用

使用docker环境安装mysql、canal、elasticsearch，基于binlog利用canal实现mysql的数据同步到elasticsearch中，并在springboot进行整合。

  1. 安装mysql并配置binlog

  2. 安装elasticsearch

  3. 安装Canal server

  4. 在springboot实现整合

所用环境版本类型：

  • MacOS Monterey
  • mysql 5.7.36
  • es 7.17.9
  • cannal.server: 1.1.5

1、安装mysql

安装命令

// 拉取镜像
docker pull mysql:5.7.36
// 创建容器
docker run --name mysql5.7.36 -p 3306:3306 -e MYSQL_ROOT_PASSWORD=admin -d mysql:5.7.36
// 进入容器
docker exec -it mysql5.7.36 /bin/bash
// 添加vim编辑
apt-get update
apt-get install vim
#注意 apt-get报错，可换yum命令使用。
// 配置mysql
cd /etc/mysql/mysql.conf.d
vim mysqld.cnf  // 修改mysql配置
// 拉取镜像
docker pull mysql:5.7.36
// 创建容器
docker run --name mysql5.7.36 -p 3306:3306 -e MYSQL_ROOT_PASSWORD=admin -d mysql:5.7.36
// 进入容器
docker exec -it mysql5.7.36 /bin/bash
// 添加vim编辑
apt-get update
apt-get install vim
#注意 apt-get报错，可换yum命令使用。
// 配置mysql
cd /etc/mysql/mysql.conf.d
vim mysqld.cnf  // 修改mysql配置
// 拉取镜像
docker pull mysql:5.7.36
// 创建容器
docker run --name mysql5.7.36 -p 3306:3306 -e MYSQL_ROOT_PASSWORD=admin -d mysql:5.7.36
// 进入容器
docker exec -it mysql5.7.36 /bin/bash
// 添加vim编辑
apt-get update
apt-get install vim
#注意 apt-get报错，可换yum命令使用。
// 配置mysql
cd /etc/mysql/mysql.conf.d
vim mysqld.cnf  // 修改mysql配置

配置：与官网一致

[mysqld]
#binlog setting
log-bin=mysql-bin  // 开启logbin
binlog-format=ROW  // binlog日志格式
server-id=1  // mysql主从备份serverId,canal中不能与此相同
[mysqld]
#binlog setting
log-bin=mysql-bin  // 开启logbin
binlog-format=ROW  // binlog日志格式
server-id=1  // mysql主从备份serverId,canal中不能与此相同
[mysqld]
#binlog setting
log-bin=mysql-bin  // 开启logbin
binlog-format=ROW  // binlog日志格式
server-id=1  // mysql主从备份serverId,canal中不能与此相同

数据库创建一个canal账号，并且设置slave,dump权限

CREATE USER canal IDENTIFIED BY 'canal';  
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';
-- GRANT ALL PRIVILEGES ON *.* TO 'canal'@'%' ;
FLUSH PRIVILEGES;
CREATE USER canal IDENTIFIED BY 'canal';  
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';
-- GRANT ALL PRIVILEGES ON *.* TO 'canal'@'%' ;
FLUSH PRIVILEGES;
CREATE USER canal IDENTIFIED BY 'canal';  
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';
-- GRANT ALL PRIVILEGES ON *.* TO 'canal'@'%' ;
FLUSH PRIVILEGES;

因为mysql8.0.3后身份检验方式为caching_sha2_password，但canal使用的是mysql_native_password，因此需要设置检验方式（如果该版本之前的可跳过），否则会报错IOException: caching_sha2_password Auth failed

ALTER USER 'canal'@'%' IDENTIFIED WITH mysql_native_password BY 'canal';
select host,user,plugin from mysql.user ;
ALTER USER 'canal'@'%' IDENTIFIED WITH mysql_native_password BY 'canal';
select host,user,plugin from mysql.user ;
ALTER USER 'canal'@'%' IDENTIFIED WITH mysql_native_password BY 'canal';
select host,user,plugin from mysql.user ;

保存退出，然后重启mysql容器

docker restart mysql5.7.36
docker restart mysql5.7.36
docker restart mysql5.7.36

做完这一步可查看前面是否有误：

// 进入容器
docker exec -it mysql5.7.36 /bin/bash
mysql -uroot -p
show master status  // binlog日志文件
reset master; // 重启日志
show variables like 'binlog_format'; //查看是否配置成功
// 进入容器
docker exec -it mysql5.7.36 /bin/bash
mysql -uroot -p
show master status  // binlog日志文件
reset master; // 重启日志
show variables like 'binlog_format'; //查看是否配置成功
// 进入容器
docker exec -it mysql5.7.36 /bin/bash
mysql -uroot -p
show master status  // binlog日志文件
reset master; // 重启日志
show variables like 'binlog_format'; //查看是否配置成功

image-20230614112244334.png

查看日志文件：

cd /var/lib/mysql  // 进入日志文件目录
mysqlbinlog -vv mysql-bin.000001  // row格式查看日志
cd /var/lib/mysql  // 进入日志文件目录
mysqlbinlog -vv mysql-bin.000001  // row格式查看日志
cd /var/lib/mysql  // 进入日志文件目录
mysqlbinlog -vv mysql-bin.000001  // row格式查看日志

mysql已经安装成功了。

2、安装es

略。

3、安装canal-server

docker pull canal/canal-server:v1.1.5
docker run --name canal1.1.5 -p 11111:11111  --link mysql5.7.36:mysql5.7.36 -id canal/canal-server:v1.1.5
docker pull canal/canal-server:v1.1.5
docker run --name canal1.1.5 -p 11111:11111  --link mysql5.7.36:mysql5.7.36 -id canal/canal-server:v1.1.5
docker pull canal/canal-server:v1.1.5
docker run --name canal1.1.5 -p 11111:11111  --link mysql5.7.36:mysql5.7.36 -id canal/canal-server:v1.1.5

修改对应的配置：

docker exec -it canal1.1.5 /bin/bash
cd canal-server/conf/example/
vi instance.properties  // 修改配置
# 把0改成10，只要不和mysql的id相同就行
canal.instance.mysql.slaveId=10
# 修改成mysql对应的账号密码，mysql5.7.36就是mysql镜像的链接别名
canal.instance.master.address=mysql5.7.36:3306
canal.instance.dbUsername=canal
canal.instance.dbPassword=canal
docker exec -it canal1.1.5 /bin/bash
cd canal-server/conf/example/
vi instance.properties  // 修改配置


# 把0改成10，只要不和mysql的id相同就行
canal.instance.mysql.slaveId=10
# 修改成mysql对应的账号密码，mysql5.7.36就是mysql镜像的链接别名
canal.instance.master.address=mysql5.7.36:3306
canal.instance.dbUsername=canal
canal.instance.dbPassword=canal
docker exec -it canal1.1.5 /bin/bash
cd canal-server/conf/example/
vi instance.properties  // 修改配置


# 把0改成10，只要不和mysql的id相同就行
canal.instance.mysql.slaveId=10
# 修改成mysql对应的账号密码，mysql5.7.36就是mysql镜像的链接别名
canal.instance.master.address=mysql5.7.36:3306
canal.instance.dbUsername=canal
canal.instance.dbPassword=canal

#################################################
## mysql serverId , v1.0.26+ will autoGen
canal.instance.mysql.slaveId=10
# enable gtid use true/false
canal.instance.gtidon=false
# position info
canal.instance.master.address=mysql5.7.36:3306
canal.instance.master.journal.name=
canal.instance.master.position=
canal.instance.master.timestamp=
canal.instance.master.gtid=
# rds oss binlog
canal.instance.rds.accesskey=
canal.instance.rds.secretkey=
canal.instance.rds.instanceId=
# table meta tsdb info
canal.instance.tsdb.enable=true
#canal.instance.tsdb.url=jdbc:mysql://127.0.0.1:3306/canal_tsdb
#canal.instance.tsdb.dbUsername=canal
#canal.instance.tsdb.dbPassword=canal
#canal.instance.standby.address =
#canal.instance.standby.journal.name =
#canal.instance.standby.position =
#canal.instance.standby.timestamp =
#canal.instance.standby.gtid=
# username/password
canal.instance.dbUsername=canal
canal.instance.dbPassword=canal
canal.instance.connectionCharset = UTF-8
# enable druid Decrypt database password
canal.instance.enableDruid=false
#canal.instance.pwdPublicKey=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALK4BUxdDltRRE5/zXpVEVPUgunvscYFtEip3pmLlhrWpacX7y7GCMo2/JM6LeHmiiNdH1FWgGCpUfircSwlWKUCAwEAAQ==
# table regex
canal.instance.filter.regex=.*\\..*
# table black regex
canal.instance.filter.black.regex=mysql\\.slave_.*
# table field filter(format: schema1.tableName1:field1/field2,schema2.tableName2:field1/field2)
#canal.instance.filter.field=test1.t_product:id/subject/keywords,test2.t_company:id/name/contact/ch
# table field black filter(format: schema1.tableName1:field1/field2,schema2.tableName2:field1/field2)
#canal.instance.filter.black.field=test1.t_product:subject/product_image,test2.t_company:id/name/contact/ch
# mq config
canal.mq.topic=example
# dynamic topic route by schema or table regex
#canal.mq.dynamicTopic=mytest1.user,mytest2\\..*,.*\\..*
canal.mq.partition=0
# hash partition config
#canal.mq.partitionsNum=3
#canal.mq.partitionHash=test.table:id^name,.*\\..*
#canal.mq.dynamicTopicPartitionNum=test.*:4,mycanal:6
#################################################
#################################################
## mysql serverId , v1.0.26+ will autoGen
canal.instance.mysql.slaveId=10


# enable gtid use true/false
canal.instance.gtidon=false


# position info
canal.instance.master.address=mysql5.7.36:3306
canal.instance.master.journal.name=
canal.instance.master.position=
canal.instance.master.timestamp=
canal.instance.master.gtid=


# rds oss binlog
canal.instance.rds.accesskey=
canal.instance.rds.secretkey=
canal.instance.rds.instanceId=

# table meta tsdb info
canal.instance.tsdb.enable=true
#canal.instance.tsdb.url=jdbc:mysql://127.0.0.1:3306/canal_tsdb
#canal.instance.tsdb.dbUsername=canal
#canal.instance.tsdb.dbPassword=canal


#canal.instance.standby.address =
#canal.instance.standby.journal.name =
#canal.instance.standby.position =
#canal.instance.standby.timestamp =
#canal.instance.standby.gtid=


# username/password
canal.instance.dbUsername=canal
canal.instance.dbPassword=canal
canal.instance.connectionCharset = UTF-8
# enable druid Decrypt database password
canal.instance.enableDruid=false
#canal.instance.pwdPublicKey=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALK4BUxdDltRRE5/zXpVEVPUgunvscYFtEip3pmLlhrWpacX7y7GCMo2/JM6LeHmiiNdH1FWgGCpUfircSwlWKUCAwEAAQ==

# table regex
canal.instance.filter.regex=.*\\..*
# table black regex
canal.instance.filter.black.regex=mysql\\.slave_.*
# table field filter(format: schema1.tableName1:field1/field2,schema2.tableName2:field1/field2)
#canal.instance.filter.field=test1.t_product:id/subject/keywords,test2.t_company:id/name/contact/ch
# table field black filter(format: schema1.tableName1:field1/field2,schema2.tableName2:field1/field2)
#canal.instance.filter.black.field=test1.t_product:subject/product_image,test2.t_company:id/name/contact/ch


# mq config
canal.mq.topic=example
# dynamic topic route by schema or table regex
#canal.mq.dynamicTopic=mytest1.user,mytest2\\..*,.*\\..*
canal.mq.partition=0
# hash partition config
#canal.mq.partitionsNum=3
#canal.mq.partitionHash=test.table:id^name,.*\\..*
#canal.mq.dynamicTopicPartitionNum=test.*:4,mycanal:6
#################################################
#################################################
## mysql serverId , v1.0.26+ will autoGen
canal.instance.mysql.slaveId=10


# enable gtid use true/false
canal.instance.gtidon=false


# position info
canal.instance.master.address=mysql5.7.36:3306
canal.instance.master.journal.name=
canal.instance.master.position=
canal.instance.master.timestamp=
canal.instance.master.gtid=


# rds oss binlog
canal.instance.rds.accesskey=
canal.instance.rds.secretkey=
canal.instance.rds.instanceId=

# table meta tsdb info
canal.instance.tsdb.enable=true
#canal.instance.tsdb.url=jdbc:mysql://127.0.0.1:3306/canal_tsdb
#canal.instance.tsdb.dbUsername=canal
#canal.instance.tsdb.dbPassword=canal


#canal.instance.standby.address =
#canal.instance.standby.journal.name =
#canal.instance.standby.position =
#canal.instance.standby.timestamp =
#canal.instance.standby.gtid=


# username/password
canal.instance.dbUsername=canal
canal.instance.dbPassword=canal
canal.instance.connectionCharset = UTF-8
# enable druid Decrypt database password
canal.instance.enableDruid=false
#canal.instance.pwdPublicKey=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALK4BUxdDltRRE5/zXpVEVPUgunvscYFtEip3pmLlhrWpacX7y7GCMo2/JM6LeHmiiNdH1FWgGCpUfircSwlWKUCAwEAAQ==

# table regex
canal.instance.filter.regex=.*\\..*
# table black regex
canal.instance.filter.black.regex=mysql\\.slave_.*
# table field filter(format: schema1.tableName1:field1/field2,schema2.tableName2:field1/field2)
#canal.instance.filter.field=test1.t_product:id/subject/keywords,test2.t_company:id/name/contact/ch
# table field black filter(format: schema1.tableName1:field1/field2,schema2.tableName2:field1/field2)
#canal.instance.filter.black.field=test1.t_product:subject/product_image,test2.t_company:id/name/contact/ch


# mq config
canal.mq.topic=example
# dynamic topic route by schema or table regex
#canal.mq.dynamicTopic=mytest1.user,mytest2\\..*,.*\\..*
canal.mq.partition=0
# hash partition config
#canal.mq.partitionsNum=3
#canal.mq.partitionHash=test.table:id^name,.*\\..*
#canal.mq.dynamicTopicPartitionNum=test.*:4,mycanal:6
#################################################

也可精确点对点同步（不是很复杂默认就好，无需配置下面内容）

# 开始同步的binlog日志文件，注意这里的binlog文件名以你自己查出来的为准
canal.instance.master.journal.name=mysql-bin.000001
# 开始同步的binlog文件位置
canal.instance.master.position=0
# 开始同步时间点 时间戳形式
canal.instance.master.timestamp=1546272000
# 配置不同步的mysql库
canal.instance.filter.black.regex=mysql\..*
mysql数据同步起点说明：
canal.instance.master.journal.name + canal.instance.master.position : 精确指定一个binlog位点，进行启动
canal.instance.master.timestamp : 指定一个时间戳，canal会自动遍历mysql binlog，找到对应时间戳的binlog位点后，进行启动不指定任何信息：默认从当前数据库的位点，进行启动。(show master status)
# 开始同步的binlog日志文件，注意这里的binlog文件名以你自己查出来的为准
canal.instance.master.journal.name=mysql-bin.000001
# 开始同步的binlog文件位置
canal.instance.master.position=0
# 开始同步时间点 时间戳形式
canal.instance.master.timestamp=1546272000
# 配置不同步的mysql库
canal.instance.filter.black.regex=mysql\..*



mysql数据同步起点说明：
canal.instance.master.journal.name + canal.instance.master.position : 精确指定一个binlog位点，进行启动
canal.instance.master.timestamp : 指定一个时间戳，canal会自动遍历mysql binlog，找到对应时间戳的binlog位点后，进行启动不指定任何信息：默认从当前数据库的位点，进行启动。(show master status)
# 开始同步的binlog日志文件，注意这里的binlog文件名以你自己查出来的为准
canal.instance.master.journal.name=mysql-bin.000001
# 开始同步的binlog文件位置
canal.instance.master.position=0
# 开始同步时间点 时间戳形式
canal.instance.master.timestamp=1546272000
# 配置不同步的mysql库
canal.instance.filter.black.regex=mysql\..*



mysql数据同步起点说明：
canal.instance.master.journal.name + canal.instance.master.position : 精确指定一个binlog位点，进行启动
canal.instance.master.timestamp : 指定一个时间戳，canal会自动遍历mysql binlog，找到对应时间戳的binlog位点后，进行启动不指定任何信息：默认从当前数据库的位点，进行启动。(show master status)

instance.properties文件的配置详情可访问github.com/alibaba/can…

查看配置是否成功：

#首先重启一下canal
docker restart  canal1.1.5
docker exec -it canal1.1.5 /bin/bash
cd canal-server/logs/example/
tail -100f example.log  // 查看日志
#首先重启一下canal
docker restart  canal1.1.5

docker exec -it canal1.1.5 /bin/bash
cd canal-server/logs/example/
tail -100f example.log  // 查看日志
#首先重启一下canal
docker restart  canal1.1.5

docker exec -it canal1.1.5 /bin/bash
cd canal-server/logs/example/
tail -100f example.log  // 查看日志

image-20230614113556100.png

如以上状况，则说明mysql连接canal-server成功，此时mysql中的数据变化，都会在canal中有同步。

可以通过Java程序测试有没连接上mysql：

<dependency>
    <groupId>com.alibaba.otter</groupId>
    <artifactId>canal.client</artifactId>
    <version>1.1.4</version>
</dependency>
<dependency>
    <groupId>com.alibaba.otter</groupId>
    <artifactId>canal.client</artifactId>
    <version>1.1.4</version>
</dependency>
<dependency>
    <groupId>com.alibaba.otter</groupId>
    <artifactId>canal.client</artifactId>
    <version>1.1.4</version>
</dependency>

import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.common.utils.AddressUtils;
import com.alibaba.otter.canal.protocol.CanalEntry;
import com.alibaba.otter.canal.protocol.CanalEntry.*;
import com.alibaba.otter.canal.protocol.Message;
import java.net.InetSocketAddress;
import java.util.List;
public class SimpleCanalClientExample {
    public static void main(String args[]) {
        // 创建链接
        CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(AddressUtils.getHostIp(),
                11111), "example", "", "");
        int batchSize = 1000;
        int emptyCount = 0;
        try {
            connector.connect();
            connector.subscribe(".*\\..*");
            connector.rollback();
            int totalEmptyCount = 120;
            while (emptyCount < totalEmptyCount) {
                Message message = connector.getWithoutAck(batchSize); // 获取指定数量的数据
                long batchId = message.getId();
                int size = message.getEntries().size();
                if (batchId == -1 || size == 0) {
                    emptyCount++;
                    System.out.println("empty count : " + emptyCount);
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                    }
                } else {
                    emptyCount = 0;
                    // System.out.printf("message[batchId=%s,size=%s] \n", batchId, size);
                    printEntry(message.getEntries());
                }
                connector.ack(batchId); // 提交确认
                // connector.rollback(batchId); // 处理失败, 回滚数据
            }
            System.out.println("empty too many times, exit");
        } finally {
            connector.disconnect();
        }
    }
    private static void printEntry(List<Entry> entrys) {
        for (Entry entry : entrys) {
            if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN || entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONEND) {
                continue;
            }
            RowChange rowChage = null;
            try {
                rowChage = RowChange.parseFrom(entry.getStoreValue());
            } catch (Exception e) {
                throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(),
                        e);
            }
            EventType eventType = rowChage.getEventType();
            System.out.println(String.format("================> binlog[%s:%s] , name[%s,%s] , eventType : %s",
                    entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),
                    entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),
                    eventType));
            for (RowData rowData : rowChage.getRowDatasList()) {
                if (eventType == EventType.DELETE) {
                    printColumn(rowData.getBeforeColumnsList());
                } else if (eventType == EventType.INSERT) {
                    printColumn(rowData.getAfterColumnsList());
                } else {
                    System.out.println("-------> before");
                    printColumn(rowData.getBeforeColumnsList());
                    System.out.println("-------> after");
                    printColumn(rowData.getAfterColumnsList());
                }
            }
        }
    }
    private static void printColumn(List<Column> columns) {
        for (Column column : columns) {
            System.out.println(column.getName() + " : " + column.getValue() + "    update=" + column.getUpdated());
        }
    }
}
import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.common.utils.AddressUtils;
import com.alibaba.otter.canal.protocol.CanalEntry;
import com.alibaba.otter.canal.protocol.CanalEntry.*;
import com.alibaba.otter.canal.protocol.Message;

import java.net.InetSocketAddress;
import java.util.List;

public class SimpleCanalClientExample {
    public static void main(String args[]) {
        // 创建链接
        CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(AddressUtils.getHostIp(),
                11111), "example", "", "");
        int batchSize = 1000;
        int emptyCount = 0;
        try {
            connector.connect();
            connector.subscribe(".*\\..*");
            connector.rollback();
            int totalEmptyCount = 120;
            while (emptyCount < totalEmptyCount) {
                Message message = connector.getWithoutAck(batchSize); // 获取指定数量的数据
                long batchId = message.getId();
                int size = message.getEntries().size();
                if (batchId == -1 || size == 0) {
                    emptyCount++;
                    System.out.println("empty count : " + emptyCount);
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                    }
                } else {
                    emptyCount = 0;
                    // System.out.printf("message[batchId=%s,size=%s] \n", batchId, size);
                    printEntry(message.getEntries());
                }


                connector.ack(batchId); // 提交确认
                // connector.rollback(batchId); // 处理失败, 回滚数据
            }


            System.out.println("empty too many times, exit");
        } finally {
            connector.disconnect();
        }
    }


    private static void printEntry(List<Entry> entrys) {
        for (Entry entry : entrys) {
            if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN || entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONEND) {
                continue;
            }

            RowChange rowChage = null;
            try {
                rowChage = RowChange.parseFrom(entry.getStoreValue());
            } catch (Exception e) {
                throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(),
                        e);
            }

            EventType eventType = rowChage.getEventType();
            System.out.println(String.format("================> binlog[%s:%s] , name[%s,%s] , eventType : %s",
                    entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),
                    entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),
                    eventType));

            for (RowData rowData : rowChage.getRowDatasList()) {
                if (eventType == EventType.DELETE) {
                    printColumn(rowData.getBeforeColumnsList());
                } else if (eventType == EventType.INSERT) {
                    printColumn(rowData.getAfterColumnsList());
                } else {
                    System.out.println("-------> before");
                    printColumn(rowData.getBeforeColumnsList());
                    System.out.println("-------> after");
                    printColumn(rowData.getAfterColumnsList());
                }
            }
        }
    }

    private static void printColumn(List<Column> columns) {
        for (Column column : columns) {
            System.out.println(column.getName() + " : " + column.getValue() + "    update=" + column.getUpdated());
        }
    }
}

import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.common.utils.AddressUtils;
import com.alibaba.otter.canal.protocol.CanalEntry;
import com.alibaba.otter.canal.protocol.CanalEntry.*;
import com.alibaba.otter.canal.protocol.Message;

import java.net.InetSocketAddress;
import java.util.List;

public class SimpleCanalClientExample {
    public static void main(String args[]) {
        // 创建链接
        CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(AddressUtils.getHostIp(),
                11111), "example", "", "");
        int batchSize = 1000;
        int emptyCount = 0;
        try {
            connector.connect();
            connector.subscribe(".*\\..*");
            connector.rollback();
            int totalEmptyCount = 120;
            while (emptyCount < totalEmptyCount) {
                Message message = connector.getWithoutAck(batchSize); // 获取指定数量的数据
                long batchId = message.getId();
                int size = message.getEntries().size();
                if (batchId == -1 || size == 0) {
                    emptyCount++;
                    System.out.println("empty count : " + emptyCount);
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                    }
                } else {
                    emptyCount = 0;
                    // System.out.printf("message[batchId=%s,size=%s] \n", batchId, size);
                    printEntry(message.getEntries());
                }


                connector.ack(batchId); // 提交确认
                // connector.rollback(batchId); // 处理失败, 回滚数据
            }


            System.out.println("empty too many times, exit");
        } finally {
            connector.disconnect();
        }
    }


    private static void printEntry(List<Entry> entrys) {
        for (Entry entry : entrys) {
            if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN || entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONEND) {
                continue;
            }

            RowChange rowChage = null;
            try {
                rowChage = RowChange.parseFrom(entry.getStoreValue());
            } catch (Exception e) {
                throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(),
                        e);
            }

            EventType eventType = rowChage.getEventType();
            System.out.println(String.format("================&gt; binlog[%s:%s] , name[%s,%s] , eventType : %s",
                    entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),
                    entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),
                    eventType));

            for (RowData rowData : rowChage.getRowDatasList()) {
                if (eventType == EventType.DELETE) {
                    printColumn(rowData.getBeforeColumnsList());
                } else if (eventType == EventType.INSERT) {
                    printColumn(rowData.getAfterColumnsList());
                } else {
                    System.out.println("-------&gt; before");
                    printColumn(rowData.getBeforeColumnsList());
                    System.out.println("-------&gt; after");
                    printColumn(rowData.getAfterColumnsList());
                }
            }
        }
    }

    private static void printColumn(List<Column> columns) {
        for (Column column : columns) {
            System.out.println(column.getName() + " : " + column.getValue() + "    update=" + column.getUpdated());
        }
    }
}

在mysql的可视化工具进行数据更新后idea控制台就会有数据的显示。

4、整合springboot

自定义客户端client

1、新建一个springboot项目

引入依赖spring-boot-starter-data-elasticsearch、canal-spring-boot-starter

<!--  Canal客户端服务   -->
<dependency>
  <groupId>top.javatool</groupId>
  <artifactId>canal-spring-boot-starter</artifactId>
  <version>1.2.1-RELEASE</version>
</dependency>
<!-- elasticsearch-->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<!--  Canal客户端服务   -->
<dependency>
  <groupId>top.javatool</groupId>
  <artifactId>canal-spring-boot-starter</artifactId>
  <version>1.2.1-RELEASE</version>
</dependency>
<!-- elasticsearch-->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<!--  Canal客户端服务   -->
<dependency>
  <groupId>top.javatool</groupId>
  <artifactId>canal-spring-boot-starter</artifactId>
  <version>1.2.1-RELEASE</version>
</dependency>
<!-- elasticsearch-->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>

2、修改配置文件application.yml

# 应用名称
spring:
  # es配置
  elasticsearch:
    uris: http://localhost:9200
    username: root
    password: 123456
  # 数据库配置
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.244.17:3306/canal_test?useSSL=false&useUnicode=true&characterEncoding=utf-8
    username: root
    password: 123456
    
# canal服务端地址
canal:
  destination: example # canal的集群名字，要与安装canal时设置的名称一致
  server: 127.0.0.1:11111 # canal服务地址
  
# 设置canal消息日志打印级别
logging:
  level:
    top.javatool.canal.client: warn
# 应用名称
spring:
  # es配置
  elasticsearch:
    uris: http://localhost:9200
    username: root
    password: 123456
  # 数据库配置
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.244.17:3306/canal_test?useSSL=false&useUnicode=true&characterEncoding=utf-8
    username: root
    password: 123456
    
# canal服务端地址
canal:
  destination: example # canal的集群名字，要与安装canal时设置的名称一致
  server: 127.0.0.1:11111 # canal服务地址
  
# 设置canal消息日志打印级别
logging:
  level:
    top.javatool.canal.client: warn
# 应用名称
spring:
	# es配置
  elasticsearch:
    uris: http://localhost:9200
    username: root
    password: 123456
  # 数据库配置
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.244.17:3306/canal_test?useSSL=false&useUnicode=true&characterEncoding=utf-8
    username: root
    password: 123456
    
# canal服务端地址
canal:
  destination: example # canal的集群名字，要与安装canal时设置的名称一致
  server: 127.0.0.1:11111 # canal服务地址
  
# 设置canal消息日志打印级别
logging:
  level:
    top.javatool.canal.client: warn

3、新建实体类为下面数据同步做准备。

新建mysql表实体类

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableLogic;
import com.baomidou.mybatisplus.annotation.TableName;
import java.io.Serializable;
import java.util.Date;
import lombok.Data;
/**
 * 帖子
 *
 */
@TableName(value = "post")
@Data
public class Post implements Serializable {
    /**
     * id
     */
    @TableId(type = IdType.ASSIGN_ID)
    private Long id;
    /**
     * 标题
     */
    private String title;
    /**
     * 内容
     */
    private String content;
    /**
     * 标签列表 json
     */
    private String tags;
    /**
     * 点赞数
     */
    private Integer thumbNum;
    /**
     * 收藏数
     */
    private Integer favourNum;
    /**
     * 创建用户 id
     */
    private Long userId;
    /**
     * 创建时间
     */
    private Date createTime;
    /**
     * 更新时间
     */
    private Date updateTime;
    /**
     * 是否删除
     */
    @TableLogic
    private Integer isDelete;
    @TableField(exist = false)
    private static final long serialVersionUID = 1L;
}
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableLogic;
import com.baomidou.mybatisplus.annotation.TableName;
import java.io.Serializable;
import java.util.Date;
import lombok.Data;



/**
 * 帖子
 *
 */
@TableName(value = "post")
@Data
public class Post implements Serializable {


    /**

     * id
     */
    @TableId(type = IdType.ASSIGN_ID)
    private Long id;

    /**
     * 标题
     */
    private String title;

    /**
     * 内容
     */
    private String content;

    /**
     * 标签列表 json
     */
    private String tags;


    /**

     * 点赞数
     */

    private Integer thumbNum;

    /**
     * 收藏数
     */
    private Integer favourNum;


    /**
     * 创建用户 id
     */
    private Long userId;

    /**
     * 创建时间
     */
    private Date createTime;

    /**
     * 更新时间
     */
    private Date updateTime;

    /**
     * 是否删除
     */
    @TableLogic
    private Integer isDelete;

    @TableField(exist = false)
    private static final long serialVersionUID = 1L;
}
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableLogic;
import com.baomidou.mybatisplus.annotation.TableName;
import java.io.Serializable;
import java.util.Date;
import lombok.Data;



/**
 * 帖子
 *
 */
@TableName(value = "post")
@Data
public class Post implements Serializable {


    /**

     * id
     */
    @TableId(type = IdType.ASSIGN_ID)
    private Long id;

    /**
     * 标题
     */
    private String title;

    /**
     * 内容
     */
    private String content;

    /**
     * 标签列表 json
     */
    private String tags;


    /**

     * 点赞数
     */

    private Integer thumbNum;

    /**
     * 收藏数
     */
    private Integer favourNum;


    /**
     * 创建用户 id
     */
    private Long userId;

    /**
     * 创建时间
     */
    private Date createTime;

    /**
     * 更新时间
     */
    private Date updateTime;

    /**
     * 是否删除
     */
    @TableLogic
    private Integer isDelete;

    @TableField(exist = false)
    private static final long serialVersionUID = 1L;
}

新建es实体类

import com.google.common.reflect.TypeToken;
import com.google.gson.Gson;
import com.song.search.model.entity.Post;
import lombok.Data;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
import org.springframework.data.elasticsearch.annotations.FieldType;
import java.io.Serializable;
import java.util.Date;
import java.util.List;
/**
 * 帖子 ES 包装类
 *
 *
 **/
@Document(indexName = "post_v1")
@Data
public class PostEsDTO implements Serializable {
    private static final String DATE_TIME_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
    /**
     * id
     */
    @Id
    private Long id;
    /**
     * 标题
     */
    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
    private String title;
    /**
     * 内容
     */
    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
    private String content;
    /**
     * 标签列表
     */
    @Field(type = FieldType.Keyword)
    private List<String> tags;
    /**
     * 创建用户 id
     */
    @Field(type = FieldType.Keyword)
    private Long userId;
    /**
     * 创建时间
     */
    @Field(index = false, store = true, type = FieldType.Date, format = {}, pattern = DATE_TIME_PATTERN)
    private Date createTime;
    /**
     * 更新时间
     */
    @Field(index = false, store = true, type = FieldType.Date, format = {}, pattern = DATE_TIME_PATTERN)
    private Date updateTime;
    /**
     * 是否删除
     */
    @Field(type = FieldType.Keyword)
    private Integer isDelete;
    private static final long serialVersionUID = 1L;
    private static final Gson GSON = new Gson();
    /**
     * 对象转包装类
     *
     * @param post
     * @return
     */
    public static PostEsDTO objToDto(Post post) {
        if (post == null) {
            return null;
        }
        PostEsDTO postEsDTO = new PostEsDTO();
        BeanUtils.copyProperties(post, postEsDTO);
        String tagsStr = post.getTags();
        if (StringUtils.isNotBlank(tagsStr)) {
            postEsDTO.setTags(GSON.fromJson(tagsStr, new TypeToken<List<String>>() {
            }.getType()));
        }
        return postEsDTO;
    }
    /**
     * 包装类转对象
     *
     * @param postEsDTO
     * @return
     */
    public static Post dtoToObj(PostEsDTO postEsDTO) {
        if (postEsDTO == null) {
            return null;
        }
        Post post = new Post();
        BeanUtils.copyProperties(postEsDTO, post);
        List<String> tagList = postEsDTO.getTags();
        if (CollectionUtils.isNotEmpty(tagList)) {
            post.setTags(GSON.toJson(tagList));
        }
        return post;
    }
}
import com.google.common.reflect.TypeToken;
import com.google.gson.Gson;
import com.song.search.model.entity.Post;

import lombok.Data;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
import org.springframework.data.elasticsearch.annotations.FieldType;
import java.io.Serializable;
import java.util.Date;
import java.util.List;

/**
 * 帖子 ES 包装类
 *
 *
 **/
@Document(indexName = "post_v1")
@Data
public class PostEsDTO implements Serializable {


    private static final String DATE_TIME_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";

    /**
     * id
     */
    @Id
    private Long id;

    /**
     * 标题
     */
    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
    private String title;


    /**

     * 内容
     */

    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
    private String content;


    /**
     * 标签列表
     */
    @Field(type = FieldType.Keyword)
    private List<String> tags;


    /**
     * 创建用户 id
     */
    @Field(type = FieldType.Keyword)
    private Long userId;
    /**
     * 创建时间
     */
    @Field(index = false, store = true, type = FieldType.Date, format = {}, pattern = DATE_TIME_PATTERN)
    private Date createTime;

    /**
     * 更新时间
     */
    @Field(index = false, store = true, type = FieldType.Date, format = {}, pattern = DATE_TIME_PATTERN)
    private Date updateTime;

    /**
     * 是否删除
     */
    @Field(type = FieldType.Keyword)
    private Integer isDelete;

    private static final long serialVersionUID = 1L;

    private static final Gson GSON = new Gson();

    /**
     * 对象转包装类
     *
     * @param post
     * @return
     */
    public static PostEsDTO objToDto(Post post) {
        if (post == null) {
            return null;
        }
        PostEsDTO postEsDTO = new PostEsDTO();
        BeanUtils.copyProperties(post, postEsDTO);
        String tagsStr = post.getTags();
        if (StringUtils.isNotBlank(tagsStr)) {
            postEsDTO.setTags(GSON.fromJson(tagsStr, new TypeToken<List<String>>() {
            }.getType()));
        }
        return postEsDTO;
    }

    /**
     * 包装类转对象
     *
     * @param postEsDTO
     * @return
     */
    public static Post dtoToObj(PostEsDTO postEsDTO) {
        if (postEsDTO == null) {
            return null;
        }
        Post post = new Post();
        BeanUtils.copyProperties(postEsDTO, post);
        List<String> tagList = postEsDTO.getTags();
        if (CollectionUtils.isNotEmpty(tagList)) {
            post.setTags(GSON.toJson(tagList));
        }
        return post;
    }
}
import com.google.common.reflect.TypeToken;
import com.google.gson.Gson;
import com.song.search.model.entity.Post;

import lombok.Data;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
import org.springframework.data.elasticsearch.annotations.FieldType;
import java.io.Serializable;
import java.util.Date;
import java.util.List;

/**
 * 帖子 ES 包装类
 *
 *
 **/
@Document(indexName = "post_v1")
@Data
public class PostEsDTO implements Serializable {


    private static final String DATE_TIME_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";

    /**
     * id
     */
    @Id
    private Long id;

    /**
     * 标题
     */
    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
    private String title;


    /**

     * 内容
     */

    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
    private String content;


    /**
     * 标签列表
     */
    @Field(type = FieldType.Keyword)
    private List<String> tags;


    /**
     * 创建用户 id
     */
    @Field(type = FieldType.Keyword)
    private Long userId;
    /**
     * 创建时间
     */
    @Field(index = false, store = true, type = FieldType.Date, format = {}, pattern = DATE_TIME_PATTERN)
    private Date createTime;

    /**
     * 更新时间
     */
    @Field(index = false, store = true, type = FieldType.Date, format = {}, pattern = DATE_TIME_PATTERN)
    private Date updateTime;

    /**
     * 是否删除
     */
    @Field(type = FieldType.Keyword)
    private Integer isDelete;

    private static final long serialVersionUID = 1L;

    private static final Gson GSON = new Gson();

    /**
     * 对象转包装类
     *
     * @param post
     * @return
     */
    public static PostEsDTO objToDto(Post post) {
        if (post == null) {
            return null;
        }
        PostEsDTO postEsDTO = new PostEsDTO();
        BeanUtils.copyProperties(post, postEsDTO);
        String tagsStr = post.getTags();
        if (StringUtils.isNotBlank(tagsStr)) {
            postEsDTO.setTags(GSON.fromJson(tagsStr, new TypeToken<List<String>>() {
            }.getType()));
        }
        return postEsDTO;
    }

    /**
     * 包装类转对象
     *
     * @param postEsDTO
     * @return
     */
    public static Post dtoToObj(PostEsDTO postEsDTO) {
        if (postEsDTO == null) {
            return null;
        }
        Post post = new Post();
        BeanUtils.copyProperties(postEsDTO, post);
        List<String> tagList = postEsDTO.getTags();
        if (CollectionUtils.isNotEmpty(tagList)) {
            post.setTags(GSON.toJson(tagList));
        }
        return post;
    }
}

4、接下来我们基于canal-client提供的EntryHandler类来实现对于数据表的监控，从而达到数据的增删改同步。

import com.song.search.esdao.PostEsDao;
import com.song.search.model.dto.post.PostEsDTO;
import com.song.search.model.entity.Post;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import top.javatool.canal.client.annotation.CanalTable;
import top.javatool.canal.client.handler.EntryHandler;
import javax.annotation.Resource;
@CanalTable("post") // mysql数据库表明
@Component
@Slf4j
public class CanalSyncPostToEs implements EntryHandler<Post> {
    @Resource
    private PostEsDao postEsDao;
    /**
     * mysql中数据有新增时自动执行
     *
     * @param hotel 新增的数据
     */
    @Override
    public void insert(Post hotel) {
        PostEsDTO postEsDTO = PostEsDTO.objToDto(hotel);
        //把新增数据hotel,添加到ES即可
        postEsDao.save(postEsDTO);
    }
    /**
     * mysql中数据有修改时自动执行
     *
     * @param before 修改前的数据
     * @param after  修改后的数据
     */
    @Override
    public void update(Post before, Post after) {
        //把修改数据,更新到ES即可
        PostEsDTO postEsDTO = PostEsDTO.objToDto(after);
        //把新增数据hotel,添加到ES即可
        postEsDao.save(postEsDTO);
    }
    /**
     * ysql中数据有删除时自动执行
     *
     * @param hotel 要删除的数据
     */
    @Override
    public void delete(Post hotel) {
        //把要删除的数据hotel,从ES删除即可
        postEsDao.deleteById(hotel.getId());
    }
}
import com.song.search.esdao.PostEsDao;
import com.song.search.model.dto.post.PostEsDTO;
import com.song.search.model.entity.Post;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import top.javatool.canal.client.annotation.CanalTable;
import top.javatool.canal.client.handler.EntryHandler;
import javax.annotation.Resource;



@CanalTable("post") // mysql数据库表明
@Component
@Slf4j
public class CanalSyncPostToEs implements EntryHandler<Post> {


    @Resource
    private PostEsDao postEsDao;


    /**

     * mysql中数据有新增时自动执行
     *
     * @param hotel 新增的数据
     */
    @Override
    public void insert(Post hotel) {


        PostEsDTO postEsDTO = PostEsDTO.objToDto(hotel);
        //把新增数据hotel,添加到ES即可
        postEsDao.save(postEsDTO);

    }


    /**
     * mysql中数据有修改时自动执行
     *
     * @param before 修改前的数据
     * @param after  修改后的数据
     */
    @Override
    public void update(Post before, Post after) {


        //把修改数据,更新到ES即可
        PostEsDTO postEsDTO = PostEsDTO.objToDto(after);
        //把新增数据hotel,添加到ES即可
        postEsDao.save(postEsDTO);

    }

    /**
     * ysql中数据有删除时自动执行
     *
     * @param hotel 要删除的数据
     */
    @Override
    public void delete(Post hotel) {

        //把要删除的数据hotel,从ES删除即可
        postEsDao.deleteById(hotel.getId());
    }
}
import com.song.search.esdao.PostEsDao;
import com.song.search.model.dto.post.PostEsDTO;
import com.song.search.model.entity.Post;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import top.javatool.canal.client.annotation.CanalTable;
import top.javatool.canal.client.handler.EntryHandler;
import javax.annotation.Resource;



@CanalTable("post") // mysql数据库表明
@Component
@Slf4j
public class CanalSyncPostToEs implements EntryHandler<Post> {


    @Resource
    private PostEsDao postEsDao;


    /**

     * mysql中数据有新增时自动执行
     *
     * @param hotel 新增的数据
     */
    @Override
    public void insert(Post hotel) {


        PostEsDTO postEsDTO = PostEsDTO.objToDto(hotel);
        //把新增数据hotel,添加到ES即可
        postEsDao.save(postEsDTO);

    }


    /**
     * mysql中数据有修改时自动执行
     *
     * @param before 修改前的数据
     * @param after  修改后的数据
     */
    @Override
    public void update(Post before, Post after) {


        //把修改数据,更新到ES即可
        PostEsDTO postEsDTO = PostEsDTO.objToDto(after);
        //把新增数据hotel,添加到ES即可
        postEsDao.save(postEsDTO);

    }

    /**
     * ysql中数据有删除时自动执行
     *
     * @param hotel 要删除的数据
     */
    @Override
    public void delete(Post hotel) {

        //把要删除的数据hotel,从ES删除即可
        postEsDao.deleteById(hotel.getId());
    }
}

补充：es的dao操作/与mybatis操作数据库相同

/**
 * 帖子 ES 操作
 *
 *
 */
public interface PostEsDao extends ElasticsearchRepository<PostEsDTO, Long> {
}
/**
 * 帖子 ES 操作
 *
 *
 */
public interface PostEsDao extends ElasticsearchRepository<PostEsDTO, Long> {


}
/**
 * 帖子 ES 操作
 *
 *
 */
public interface PostEsDao extends ElasticsearchRepository<PostEsDTO, Long> {


}

最后测试一下数据库的增删改。

总结

自此利用canal实现mysql的数据同步到elasticsearch就演示完成了，如果有更加复杂的同步逻辑，也可以在代码中自定义实现，并且第三方组件canal-spring-boot-starter极大的简化了自定义canal客户端的难度。

遗憾的是canal-spring-boot-starter的作者目前已经停止了对其的维护，其最新版对应的canal实际是1.1.3版本的，不过实测还不影响我们对接canal1.1.5。对canal客户端又更高性能的需求，可以研究源码，高度二开。

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