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I'm attempting to use the Azure storage SDK for node to create a Table in Table Store, if it does not exist.

The following code is valid and returns a 200 response, although there is no response content. However, the table is created as expected.

Upon investigation, I can see that the Azure Function app is logging the following -

Creating table 'Test'.
[warn] Warning: Unexpected call to 'log' on the context object after function execution has pleted. Please check for asynchronous calls that are not awaited or calls to 'done' made before function execution pletes.

So it seems that while the createTableInTableStore is working as expected, the async/await part of my function is not. I suspect that I'm doing something wrong, but from the looks of it I am correctly implementing await as and when it's requried.

How can I get the function to wait for the createTableInTableStore method to plete before it move on?

Example code

Please note that the azure-storage npm package is required (npm install azure-storage).

module.exports = async function (context) {
    var azure_storage = require('azure-storage');
    var table_service = azure_storage.createTableService(process.env["AzureWebJobsStorage"]);
    var create_table_result = await createTableInTableStore(context, table_service, "Test");
    return {
        res: create_table_result
    };
};

async function createTableInTableStore(context, table_service, table_name) {
    context.log("Creating table '"+table_name+"'.");
    return await table_service.createTableIfNotExists(table_name, function(error, result, response) {
        if (!error && result) {
            context.log.info("[Info] Table created successfully.")
        } else if (!error && !result) {
            context.log.info("[Info] Table already exists.")
        }
        if (error) {
            context.log.error("[Error] An unexpected error occurred.")
            context.log.error(" -----> " + response)
        }
    });
}

I'm attempting to use the Azure storage SDK for node to create a Table in Table Store, if it does not exist.

The following code is valid and returns a 200 response, although there is no response content. However, the table is created as expected.

Upon investigation, I can see that the Azure Function app is logging the following -

Creating table 'Test'.
[warn] Warning: Unexpected call to 'log' on the context object after function execution has pleted. Please check for asynchronous calls that are not awaited or calls to 'done' made before function execution pletes.

So it seems that while the createTableInTableStore is working as expected, the async/await part of my function is not. I suspect that I'm doing something wrong, but from the looks of it I am correctly implementing await as and when it's requried.

How can I get the function to wait for the createTableInTableStore method to plete before it move on?

Example code

Please note that the azure-storage npm package is required (npm install azure-storage).

module.exports = async function (context) {
    var azure_storage = require('azure-storage');
    var table_service = azure_storage.createTableService(process.env["AzureWebJobsStorage"]);
    var create_table_result = await createTableInTableStore(context, table_service, "Test");
    return {
        res: create_table_result
    };
};

async function createTableInTableStore(context, table_service, table_name) {
    context.log("Creating table '"+table_name+"'.");
    return await table_service.createTableIfNotExists(table_name, function(error, result, response) {
        if (!error && result) {
            context.log.info("[Info] Table created successfully.")
        } else if (!error && !result) {
            context.log.info("[Info] Table already exists.")
        }
        if (error) {
            context.log.error("[Error] An unexpected error occurred.")
            context.log.error(" -----> " + response)
        }
    });
}

• javascript
• node.js
• azure
• async-await
• azure-functions

Share Improve this question Follow asked Mar 1, 2019 at 12:07 David GardDavid Gard 12.1k4242 gold badges128128 silver badges263263 bronze badges 2

• 1 I'm not sure if you need these two await statement, so did you try to remove the second one? And the table_service.createTableIfNotExists returns a promise? – BrTkCa Commented Mar 1, 2019 at 12:27
• See the accepted answer below - I guess it wasn't returning a promise, and I misunderstood what await would do. Thanks. – David Gard Commented Mar 1, 2019 at 13:24

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 9

you can return a promise it will work. and use try catch to handle errors when you use await.

module.exports = async function (context) {
    try{
    var azure_storage = require('azure-storage');
    var table_service = azure_storage.createTableService(process.env["AzureWebJobsStorage"]);
    var create_table_result = await createTableInTableStore(context, table_service, "Test");
      return {
          res: create_table_result
      };
    }catch(err){
    //handle errr
    console.log(err);
     }
};

function createTableInTableStore(context, table_service, table_name) {
    context.log("Creating table '"+table_name+"'.");
    return new Promise((resolve, reject) => {
      table_service.createTableIfNotExists(table_name, function(error, result, response) {
        if (!error && result) {
            context.log.info("[Info] Table created successfully.")
            resolve(result)
        } else if (!error && !result) {
            context.log.info("[Info] Table already exists.")
            resolve(response)
        }
        if (error) {
            context.log.error("[Error] An unexpected error occurred.")
            context.log.error(" -----> " + response)
            reject(error)
        }
    });
});
}

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