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pg-logical-replication
Advanced tools
Readme
$ npm install pg-logical-replication
wal2json
. A replication slot(test_slot_wal2json
) must be created on the PostgreSQL server.
SELECT * FROM pg_create_logical_replication_slot('test_slot_wal2json', 'wal2json')
const slotName = 'test_slot_wal2json';
const service = new LogicalReplicationService(
/**
* node-postgres Client options for connection
* https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/pg/index.d.ts#L16
*/
{
database: 'playground',
// ...
},
/**
* Logical replication service config
* https://github.com/kibae/pg-logical-replication/blob/main/src/logical-replication-service.ts#L9
*/
{
acknowledge: {
auto: true,
timeoutSeconds: 10
}
}
)
// `TestDecodingPlugin` for test_decoding and `ProtocolBuffersPlugin` for decoderbufs are also available.
const plugin = new Wal2JsonPlugin({
/**
* Plugin options for wal2json
* https://github.com/kibae/pg-logical-replication/blob/main/src/output-plugins/wal2json/wal2json-plugin-options.type.ts
*/
//...
});
/**
* Wal2Json.Output
* https://github.com/kibae/pg-logical-replication/blob/ts-main/src/output-plugins/wal2json/wal2json-plugin-output.type.ts
*/
service.on('data', (lsn: string, log: Wal2Json.Output) => {
// Do something what you want.
// log.change.filter((change) => change.kind === 'insert').length;
});
// Start subscribing to data change events.
(function proc() {
service.subscribe(plugin, slotName)
.catch((e) => {
console.error(e);
})
.then(() => {
setTimeout(proc, 100);
});
})();
Constructor(clientConfig: ClientConfig, config?: Partial<LogicalReplicationConfig>)
const service = new LogicalReplicationService(
/**
* node-postgres Client options for connection
* https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/pg/index.d.ts#L16
*/
clientConfig: {
user?: string | undefined;
database?: string | undefined;
password?: string | (() => string | Promise<string>) | undefined;
port?: number | undefined;
host?: string | undefined;
connectionString?: string | undefined;
keepAlive?: boolean | undefined;
stream?: stream.Duplex | undefined;
statement_timeout?: false | number | undefined;
parseInputDatesAsUTC?: boolean | undefined;
ssl?: boolean | ConnectionOptions | undefined;
query_timeout?: number | undefined;
keepAliveInitialDelayMillis?: number | undefined;
idle_in_transaction_session_timeout?: number | undefined;
application_name?: string | undefined;
connectionTimeoutMillis?: number | undefined;
types?: CustomTypesConfig | undefined;
options?: string | undefined;
},
/**
* Logical replication service config
* https://github.com/kibae/pg-logical-replication/blob/main/src/logical-replication-service.ts#L9
*/
config?: Partial<{
acknowledge?: {
/**
* If the value is false, acknowledge must be done manually.
* Default: true
*/
auto: boolean;
/**
* Acknowledge is performed every set time (sec). If 0, do not do it.
* Default: 10
*/
timeoutSeconds: 0 | 10 | number;
};
}>
)
subscribe(plugin: AbstractPlugin, slotName: string, uptoLsn?: string): Promise<this>
plugin
output plugins.slotName
Logical replication slot name. You can create slot via pg_create_logical_replication_slot function.uptoLsn
(optional) The starting point of the data to be streamed.acknowledge(lsn: string): Promise<boolean>
new LogicalReplicationService({}, {acknowledge: {auto: false}})
.on(event: 'start', listener: () => Promise<void> | void)
on(event: 'data', listener: (lsn: string, log: any) => Promise<void> | void)
on(event: 'error', listener: (err: Error) => void)
on(event: 'acknowledge', listener: (lsn: string) => Promise<void> | void)
on(event: 'heartbeat', listener: (lsn: string, timestamp: number, shouldRespond: boolean) => Promise<void> | void)
service.acknowledge()
.stop(): Promise<this>
isStop(): boolean
lastLsn(): string
PgoutputPlugin
for pgoutput (Native to PostgreSQL)Wal2JsonPlugin
for wal2jsonProtocolBuffersPlugin
for decoderbufsTestDecodingPlugin
for test_decoding (Not recommended)FAQs
PostgreSQL Location Replication client - logical WAL replication streaming
The npm package pg-logical-replication receives a total of 8,924 weekly downloads. As such, pg-logical-replication popularity was classified as popular.
We found that pg-logical-replication demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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