sqmicro-streams/test/my-sql-stream.js

SQ micro streams.

const { ConnectionStream } = require('../');

module.exports = class MySqlStream extends ConnectionStream {
    async clean(keys) {
        if (!keys || keys.size < 1) {
            return;
        }
        
        let SQL = `DELETE * FROM my_table WHERE keys IN (${[...keys].join(',')})`;
        return await this.connection.query(SQL);
    }

    async copy(rows) {
        let SQL = `COPY my_table(key, value) FROM STDIN (DELIMITER '|')`;
        return this.connection.copy(SQL, rows);
    }
    
    async mapEvent(ev) {
        await this.clean(ev.refreshKeys);
        await this.copy(ev.rows);
    }

    validateConnection(c) {
        const errors = [];
        
        if (typeof c.query !== 'function') {
            errors.push('Connection instance should have query() method.');
        }

        if (typeof c.copy !== 'function') {
            errors.push('Connection instance should have copy() method');
        }

        return errors;
    }
};