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| // 多区域数据库管理器
class MultiRegionDatabaseManager {
private regions = new Map<string, DatabaseCluster>();
private replicationLag = new Map<string, number>();
// 配置数据库集群
async setupCluster(config: ClusterConfig): Promise<void> {
const { primaryRegion, replicaRegions } = config;
// 设置主库
const primary = await this.createPrimaryCluster(primaryRegion);
this.regions.set(primaryRegion, primary);
// 设置副本库
for (const region of replicaRegions) {
const replica = await this.createReplicaCluster(region, primary.connectionString);
this.regions.set(region, replica);
// 监控复制延迟
this.monitorReplicationLag(region, replica);
}
}
// 创建主集群
private async createPrimaryCluster(region: string): Promise<DatabaseCluster> {
const cluster: DatabaseCluster = {
region,
role: 'primary',
connectionString: this.buildConnectionString(region),
endpoints: await this.provisionDatabase(region, 'primary')
};
return cluster;
}
// 创建副本集群
private async createReplicaCluster(
region: string,
primaryConnectionString: string
): Promise<DatabaseCluster> {
const cluster: DatabaseCluster = {
region,
role: 'replica',
connectionString: this.buildConnectionString(region),
endpoints: await this.provisionDatabase(region, 'replica'),
source: primaryConnectionString
};
// 配置复制
await this.configureReplication(cluster);
return cluster;
}
// 配置复制
private async configureReplication(replica: DatabaseCluster): Promise<void> {
// 使用数据库原生复制
await this.setupLogicalReplication(replica);
// 或者使用 CDC
await this.setupCDCReplication(replica);
}
// 逻辑复制
private async setupLogicalReplication(replica: DatabaseCluster): Promise<void> {
// PostgreSQL 逻辑复制
const replicationSlot = `slot_${replica.region}`;
await this.executeSQL(replica.connectionString, `
CREATE PUBLICATION game_publication FOR ALL TABLES;
`);
await this.executeSQL(replica.source!, `
CREATE SUBSCRIPTION game_subscription
CONNECTION '${replica.connectionString}'
PUBLICATION game_publication
WITH (create_slot = false, slot_name = '${replicationSlot}');
`);
}
// CDC复制
private async setupCDCReplication(replica: DatabaseCluster): Promise<void> {
// 使用 Debezium
const debeziumConfig = {
'database.hostname': this.extractHost(replica.connectionString),
'database.port': 5432,
'database.user': 'replicator',
'database.password': 'password',
'database.server.name': `game_${replica.region}`,
'plugin.name': 'pgoutput',
'table.include.list': 'public.*'
};
// 启动 Debezium 连接器
await this.startDebeziumConnector(replica.region, debeziumConfig);
}
// 监控复制延迟
private monitorReplicationLag(region: string, replica: DatabaseCluster): void {
setInterval(async () => {
const lag = await this.getReplicationLag(replica);
this.replicationLag.set(region, lag);
// 告警
if (lag > 5000) { // 超过5秒
this.alertHighLag(region, lag);
}
}, 10000);
}
// 获取复制延迟
private async getReplicationLag(replica: DatabaseCluster): Promise<number> {
const result = await this.executeSQL(
replica.connectionString,
`SELECT pg_last_wal_receive_lsn() AS receive_lsn,
pg_last_wal_replay_lsn() AS replay_lsn,
EXTRACT(EPOCH FROM (NOW() - pg_last_xact_replay_timestamp())) * 1000 AS lag_ms`
);
return result[0]?.lag_ms || 0;
}
}
|