Connect Google BigTable and Send Slack messages in our serverless environment

class GoogleBigtableSourceGetRows {
    async init() {
        // More info at https://www.npmjs.com/package/@google-cloud/bigtable
        // TODO: Create team variables. More info at https://yepcode.io/docs/processes/team-variables
        this.googleBigTable = new Bigtable({
            projectId: yepcode.env.GOOGLE_BIGTABLE_PROJECT_ID,
            credentials: JSON.parse(yepcode.env.GOOGLE_BIGTABLE_SERVICE_ACCOUNT_JSON),
        });
        // TODO: Customize your instance and table names
        this.table = await this.googleBigTable
            .instance("your-instance-name")
            .table("your-table-name");
    }

    async fetch(publish, done) {
        // You can customize get options. eg: get matching keys
        // Look at: https://cloud.google.com/nodejs/docs/reference/bigtable/latest/bigtable/getrowsoptions
        const getRowsOptions = {};
        const [rows] = await this.table.getRows(getRowsOptions);

        for (const rowResponse of rows) {
            const [row] = await rowResponse.get();
            const item = this._mapRowToItem(row);
            await publish(item);
        }
        done();
    }

    _mapRowToItem(row) {
        const columnsAndLastValue = Object.entries(row.data).map(
            ([columnName, columnContent]) => [
                columnName,
                this._getLastColumnValue(columnContent),
            ]
        );
        return Object.fromEntries(columnsAndLastValue);
    }

    _getLastColumnValue(columnContent) {
        // The second [0] is to access the last value
        // You can access previous values by accessing the next
        // elements in the list
        return columnContent[0][0].value;
    }

    async close() {}
}

class SlackTargetPostMessage {
    async init() {
        // More info at https://www.npmjs.com/package/@slack/bolt
        // TODO: Create team variables. More info at https://yepcode.io/docs/processes/team-variables
        this.slack = new App({
            token: yepcode.env.SLACK_TOKEN,
            signingSecret: yepcode.env.SLACK_SIGNING_SECRET,
        });
    }

    async consume(item) {
        // TODO: Customize your channel id and message content
        // See how to find channel id at: https://help.socialintents.com/article/148-how-to-find-your-slack-team-id-and-slack-channel-id
        return await this.slack.client.chat.postMessage({
            channel: "your-slack-channel-id",
            text: item.message,
        });
    }

    async close() {}
}