Sample Azure Function

The piece of code included here shows what an Azure Function implementation looks like in JavaScript.

Generated response

The sample function in this document generates the following JSON response:

{
    "state": {
        "transactionsCursor": "2018-01-01T00:00:00Z"
    },
    "insert": {
        "transactions": [{
                "date": "2017-12-31T05:12:05Z",
                "order_id": 1001,
                "amount": "$1200",
                "discount": "$12"
            },
            {
                "date": "2017-12-31T06:12:04Z",
                "order_id": 1001,
                "amount": "$1200",
                "discount": "$12"
            }
        ]
    },
    "delete": {
        "transactions": [{
                "date": "2017-12-31T05:12:05Z",
                "order_id": 1000,
                "amount": "$1200",
                "discount": "$12"
            },
            {
                "date": "2017-12-31T06:12:04Z",
                "order_id": 1000,
                "amount": "$1200",
                "discount": "$12"
            }
        ]
    },
    "schema": {
        "transactions": {
            "primary_key": [
                "order_id",
                "date"
            ]
        }
    },
    "hasMore": "false"
}

For more information about each of the fields in this response, see the Sync Overview section of our Functions documentation.

---

JavaScript

module.exports = function(context, req) {

    if (req.body.state === undefined) {
        context.res = {
            status: 400,
            body: "No state is defined!"
        };
    }

    if (req.body.secrets === undefined) {
        context.res = {
            status: 400,
            body: "No secret is defined!"
        };
    }

    context.res = {
        status: 200,
        body: update(req.body.state, req.body.secrets)
    };
    context.done();

};

function update(state, secrets) {
    // Fetch records using api calls
    let [insertTransactions, deleteTransactions, newTransactionsCursor] = apiResponse(state, secrets);

    // Populate records and state
    return ({
        state: {
            transactionsCursor: newTransactionsCursor
        },
        insert: {
            transactions: insertTransactions
        },
        delete: {
            transactions: deleteTransactions
        },
        schema: {
            transactions: {
                primary_key: ['order_id', 'date']
            }
        },
        hasMore: false
    });
}

function apiResponse(state, secrets) {
    var insertTransactions = [{
            "date": '2017-12-31T05:12:05Z',
            "order_id": 1001,
            "amount": '$1200',
            "discount": '$12'
        },
        {
            "date": '2017-12-31T06:12:04Z',
            "order_id": 1001,
            "amount": '$1200',
            "discount": '$12'
        },
    ];

    var deleteTransactions = [{
            "date": '2017-12-31T05:12:05Z',
            "order_id": 1000,
            "amount": '$1200',
            "discount": '$12'
        },
        {
            "date": '2017-12-31T06:12:04Z',
            "order_id": 1000,
            "amount": '$1200',
            "discount": '$12'
        },
    ];

    return [insertTransactions, deleteTransactions, '2018-01-01T00:00:00Z'];
}

For more information, read Microsoft Azure Functions' online documentation.