@arturwojnar/hermes-postgresql/lib/subscribeToReplicationSlot/onData.js

Production-Ready TypeScript Outbox Pattern for PostgreSQL

import { assertNever } from '@arturwojnar/hermes';
import { XLogData_WalRecordStartByteNumber } from './consts.js';
import { processBeginMessage } from './processBeginMessage.js';
import { processCommitMessage } from './processCommitMessage.js';
import { processInsertMessage as _processInsertMessage } from './processInsertMessage.js';
import { processPrimaryKeepAliveMessage } from './processPrimaryKeepAliveMessage.js';
import { MessageType, parseMessageType, parseTopLevelType, TopLevelType } from './types.js';
const onData = (columnConfig) => {
    const processInsertMessage = _processInsertMessage(columnConfig);
    return (message) => {
        const topLevelType = parseTopLevelType(String.fromCharCode(message[0]));
        switch (topLevelType) {
            case TopLevelType.PrimaryKeepaliveMessage:
                return processPrimaryKeepAliveMessage(message);
            case TopLevelType.XLogData: {
                const data = message.subarray(XLogData_WalRecordStartByteNumber);
                const symbol = String.fromCharCode(data[0]);
                const type = parseMessageType(symbol);
                switch (type) {
                    case MessageType.Begin:
                        return processBeginMessage(data);
                    case MessageType.Insert:
                        return processInsertMessage(data);
                    case MessageType.Commit:
                        return processCommitMessage(data);
                    default:
                        return { topLevelType: TopLevelType.XLogData, messageType: MessageType.Other, symbol };
                }
            }
            default:
                assertNever(topLevelType);
        }
    };
};
export { onData };
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