Twilio binding for Azure Functions

• 07/09/2018
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This article explains how to send text messages by using Twilio bindings in Azure Functions. Azure Functions supports output bindings for Twilio.

This is reference information for Azure Functions developers. If you're new to Azure Functions, start with the following resources:

• Create your first function: C#, JavaScript, Java, or Python.
• Azure Functions developer reference.
• Language-specific reference: C#, C# script, F#, Java, JavaScript, or Python.
• Azure Functions triggers and bindings concepts.
• Code and test Azure Functions locally.

Packages - Functions 1.x

The Twilio bindings are provided in the Microsoft.Azure.WebJobs.Extensions.Twilio NuGet package, version 1.x. Source code for the package is in the azure-webjobs-sdk GitHub repository.

The following table tells how to add support for this binding in each development environment.

Packages - Functions 2.x and higher

The Twilio bindings are provided in the Microsoft.Azure.WebJobs.Extensions.Twilio NuGet package, version 3.x. Source code for the package is in the azure-webjobs-sdk GitHub repository.

The following table tells how to add support for this binding in each development environment.

To learn how to update existing binding extensions in the portal without having to republish your function app project, see Update your extensions.

Example - Functions 1.x

See the language-specific example:

• C#
• C# script (.csx)
• JavaScript

C# example

The following example shows a C# function that sends a text message when triggered by a queue message.

[FunctionName("QueueTwilio")]
[return: TwilioSms(AccountSidSetting = "TwilioAccountSid", AuthTokenSetting = "TwilioAuthToken", From = "+1425XXXXXXX" )]
public static SMSMessage Run(
    [QueueTrigger("myqueue-items", Connection = "AzureWebJobsStorage")] JObject order,
    TraceWriter log)
{
    log.Info($"C# Queue trigger function processed: {order}");

    var message = new SMSMessage()
    {
        Body = $"Hello {order["name"]}, thanks for your order!",
        To = order["mobileNumber"].ToString()
    };

    return message;
}

This example uses the TwilioSms attribute with the method return value. An alternative is to use the attribute with an out SMSMessage parameter or an ICollector<SMSMessage> or IAsyncCollector<SMSMessage> parameter.

C# script example

The following example shows a Twilio output binding in a function.json file and a C# script function that uses the binding. The function uses an out parameter to send a text message.

Here's binding data in the function.json file:

Example function.json:

{
  "type": "twilioSms",
  "name": "message",
  "accountSid": "TwilioAccountSid",
  "authToken": "TwilioAuthToken",
  "to": "+1704XXXXXXX",
  "from": "+1425XXXXXXX",
  "direction": "out",
  "body": "Azure Functions Testing"
}

Here's C# script code:

#r "Newtonsoft.Json"
#r "Twilio.Api"

using System;
using Newtonsoft.Json;
using Twilio;

public static void Run(string myQueueItem, out SMSMessage message,  TraceWriter log)
{
    log.Info($"C# Queue trigger function processed: {myQueueItem}");

    // In this example the queue item is a JSON string representing an order that contains the name of a 
    // customer and a mobile number to send text updates to.
    dynamic order = JsonConvert.DeserializeObject(myQueueItem);
    string msg = "Hello " + order.name + ", thank you for your order.";

    // Even if you want to use a hard coded message and number in the binding, you must at least 
    // initialize the SMSMessage variable.
    message = new SMSMessage();

    // A dynamic message can be set instead of the body in the output binding. In this example, we use 
    // the order information to personalize a text message to the mobile number provided for
    // order status updates.
    message.Body = msg;
    message.To = order.mobileNumber;
}

You can't use out parameters in asynchronous code. Here's an asynchronous C# script code example:

#r "Newtonsoft.Json"
#r "Twilio.Api"

using System;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Twilio;

public static async Task Run(string myQueueItem, IAsyncCollector<SMSMessage> message,  ILogger log)
{
    log.LogInformation($"C# Queue trigger function processed: {myQueueItem}");

    // In this example the queue item is a JSON string representing an order that contains the name of a 
    // customer and a mobile number to send text updates to.
    dynamic order = JsonConvert.DeserializeObject(myQueueItem);
    string msg = "Hello " + order.name + ", thank you for your order.";

    // Even if you want to use a hard coded message and number in the binding, you must at least 
    // initialize the SMSMessage variable.
    SMSMessage smsText = new SMSMessage();

    // A dynamic message can be set instead of the body in the output binding. In this example, we use 
    // the order information to personalize a text message to the mobile number provided for
    // order status updates.
    smsText.Body = msg;
    smsText.To = order.mobileNumber;

    await message.AddAsync(smsText);
}

JavaScript example

The following example shows a Twilio output binding in a function.json file and a JavaScript function that uses the binding.

Here's binding data in the function.json file:

Example function.json:

{
  "type": "twilioSms",
  "name": "message",
  "accountSid": "TwilioAccountSid",
  "authToken": "TwilioAuthToken",
  "to": "+1704XXXXXXX",
  "from": "+1425XXXXXXX",
  "direction": "out",
  "body": "Azure Functions Testing"
}

Here's the JavaScript code:

module.exports = function (context, myQueueItem) {
    context.log('Node.js queue trigger function processed work item', myQueueItem);

    // In this example the queue item is a JSON string representing an order that contains the name of a 
    // customer and a mobile number to send text updates to.
    var msg = "Hello " + myQueueItem.name + ", thank you for your order.";

    // Even if you want to use a hard coded message and number in the binding, you must at least 
    // initialize the message binding.
    context.bindings.message = {};

    // A dynamic message can be set instead of the body in the output binding. In this example, we use 
    // the order information to personalize a text message to the mobile number provided for
    // order status updates.
    context.bindings.message = {
        body : msg,
        to : myQueueItem.mobileNumber
    };

    context.done();
};

Example - Functions 2.x and higher

See the language-specific example:

• 2.x+ C#
• 2.x+ C# script (.csx)
• 2.x+ JavaScript

2.x+ C# example

The following example shows a C# function that sends a text message when triggered by a queue message.

using Microsoft.Azure.WebJobs;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Linq;
using Twilio.Rest.Api.V2010.Account;
using Twilio.Types;
namespace TwilioQueueOutput
{
    public static class QueueTwilio
    {
        [FunctionName("QueueTwilio")]
        [return: TwilioSms(AccountSidSetting = "TwilioAccountSid", AuthTokenSetting = "TwilioAuthToken", From = "+1425XXXXXXX")]
        public static CreateMessageOptions Run(
        [QueueTrigger("myqueue-items", Connection = "AzureWebJobsStorage")] JObject order,
        ILogger log)
        {
            log.LogInformation($"C# Queue trigger function processed: {order}");

            var message = new CreateMessageOptions(new PhoneNumber(order["mobileNumber"].ToString()))
            {
                Body = $"Hello {order["name"]}, thanks for your order!"
            };

            return message;
        }
    }
}

This example uses the TwilioSms attribute with the method return value. An alternative is to use the attribute with an out CreateMessageOptions parameter or an ICollector<CreateMessageOptions> or IAsyncCollector<CreateMessageOptions> parameter.

2.x+ C# script example

The following example shows a Twilio output binding in a function.json file and a C# script function that uses the binding. The function uses an out parameter to send a text message.

Here's binding data in the function.json file:

Example function.json:

{
  "type": "twilioSms",
  "name": "message",
  "accountSidSetting": "TwilioAccountSid",
  "authTokenSetting": "TwilioAuthToken",
  "from": "+1425XXXXXXX",
  "direction": "out",
  "body": "Azure Functions Testing"
}

Here's C# script code:

#r "Newtonsoft.Json"
#r "Twilio"
#r "Microsoft.Azure.WebJobs.Extensions.Twilio"

using System;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Microsoft.Azure.WebJobs.Extensions.Twilio;
using Twilio.Rest.Api.V2010.Account;
using Twilio.Types;

public static void Run(string myQueueItem, out CreateMessageOptions message,  ILogger log)
{
    log.LogInformation($"C# Queue trigger function processed: {myQueueItem}");

    // In this example the queue item is a JSON string representing an order that contains the name of a
    // customer and a mobile number to send text updates to.
    dynamic order = JsonConvert.DeserializeObject(myQueueItem);
    string msg = "Hello " + order.name + ", thank you for your order.";

    // You must initialize the CreateMessageOptions variable with the "To" phone number.
    message = new CreateMessageOptions(new PhoneNumber("+1704XXXXXXX"));

    // A dynamic message can be set instead of the body in the output binding. In this example, we use
    // the order information to personalize a text message.
    message.Body = msg;
}

You can't use out parameters in asynchronous code. Here's an asynchronous C# script code example:

#r "Newtonsoft.Json"
#r "Twilio"
#r "Microsoft.Azure.WebJobs.Extensions.Twilio"

using System;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Microsoft.Azure.WebJobs.Extensions.Twilio;
using Twilio.Rest.Api.V2010.Account;
using Twilio.Types;

public static async Task Run(string myQueueItem, IAsyncCollector<CreateMessageOptions> message,  ILogger log)
{
    log.LogInformation($"C# Queue trigger function processed: {myQueueItem}");

    // In this example the queue item is a JSON string representing an order that contains the name of a
    // customer and a mobile number to send text updates to.
    dynamic order = JsonConvert.DeserializeObject(myQueueItem);
    string msg = "Hello " + order.name + ", thank you for your order.";

    // You must initialize the CreateMessageOptions variable with the "To" phone number.
    CreateMessageOptions smsText = new CreateMessageOptions(new PhoneNumber("+1704XXXXXXX"));

    // A dynamic message can be set instead of the body in the output binding. In this example, we use
    // the order information to personalize a text message.
    smsText.Body = msg;

    await message.AddAsync(smsText);
}

2.x+ JavaScript example

The following example shows a Twilio output binding in a function.json file and a JavaScript function that uses the binding.

Here's binding data in the function.json file:

Example function.json:

{
  "type": "twilioSms",
  "name": "message",
  "accountSidSetting": "TwilioAccountSid",
  "authTokenSetting": "TwilioAuthToken",
  "from": "+1425XXXXXXX",
  "direction": "out",
  "body": "Azure Functions Testing"
}

Here's the JavaScript code:

module.exports = function (context, myQueueItem) {
    context.log('Node.js queue trigger function processed work item', myQueueItem);

    // In this example the queue item is a JSON string representing an order that contains the name of a
    // customer and a mobile number to send text updates to.
    var msg = "Hello " + myQueueItem.name + ", thank you for your order.";

    // Even if you want to use a hard coded message in the binding, you must at least
    // initialize the message binding.
    context.bindings.message = {};

    // A dynamic message can be set instead of the body in the output binding. The "To" number 
    // must be specified in code. 
    context.bindings.message = {
        body : msg,
        to : myQueueItem.mobileNumber
    };

    context.done();
};

Attributes

In C# class libraries, use the TwilioSms attribute.

For information about attribute properties that you can configure, see Configuration. Here's a TwilioSms attribute example in a method signature:

[FunctionName("QueueTwilio")]
[return: TwilioSms(AccountSidSetting = "TwilioAccountSid", AuthTokenSetting = "TwilioAuthToken", From = "+1425XXXXXXX")]
public static CreateMessageOptions Run(
[QueueTrigger("myqueue-items", Connection = "AzureWebJobsStorage")] JObject order, ILogger log)
{
    ...
}

For a complete example, see C# example.

Configuration

The following table explains the binding configuration properties that you set in the function.json file and the TwilioSms attribute.

When you're developing locally, app settings go into the local.settings.json file.

Next steps