Develop Reference

is it possible to parameterize QueueTrigger name?

I'm writing a queue-triggered azure function:
[FunctionName("OnTranslationEventQueueTriggered")]
public static void Run([QueueTrigger("translationsqueue", Connection = "TranslationsQueueConnectionString")]string myQueueItem, ILogger log)
{
log.LogInformation($"C# Queue trigger function processed: {myQueueItem}");
}
The name of the queue is translationsqueue, but I'd like to be able to parameterize this.
How do we pull the name of the queue from configuration?

Based on the Binding expressions and patterns the app setting binding expression is wrapped in percent signs, see the following example:
in the class:
QueueTrigger("%translationsqueue%", …)
in the bindings:
{
"bindings": [
{
"name": "myQueueItem",
"type": "queueTrigger",
"direction": "in",
"queueName": "%translationsqueue%",
"connection": "TranslationsQueueConnectionString"
}
]
}

Blob Storage trigger is not getting fired upon uploading an image to the container, why?

I am new to Azure and tried my hands on azure blob storage trigger function.
I have created a function:
public static void Run(Stream myBlob, string name, Stream outputBlob, ILogger log)
{ log.LogInformation($"C# Blob trigger function Processed blob\n Name:{name} \n Size: {myBlob.Length} Bytes");
}
function.json file:
{
"bindings": [
{
"name": "myBlob",
"type": "blobTrigger",
"direction": "in",
"path": "hunaincontainer/{blobname}.{blobextension}.",
"connection": "hunainfunctionstorage1_STORAGE"
},
{
"type": "blob",
"name": "outputBlob",
"path": "hunaincontainer/{blobname}-ResizedImage.{blobextension}",
"connection": "hunainfunctionstorage1_STORAGE",
"direction": "out"
}
],
"disabled": false
}
hunaincontainer is a blob storage container in general purpose storage account. I am using free Azure for testing.
I run the function and it compiles successfully and then I upload an image to hunaincontainer using portal but it doesn't hit the function. Why? The connectionstring, key value and everything is set.

I think your issue is a stray period in the path you're setting! Instead of "path": "hunaincontainer/{blobname}.{blobextension}.", try "path": "hunaincontainer/{blobname}.{blobextension}"

sendgrid send email to multiple recipients in Azure function failed

(For the complete version of this question, please refer to
https://social.msdn.microsoft.com/Forums/en-US/20bb5b37-82af-4cf3-8a59-04e5f19572bc/send-email-to-multiple-recipients-using-sendgrid-failure?forum=AzureFunctions)
Sending to single recipient was successful. But found no way to send to multiple recipients or CC/BCC in Azure function.
Tried several formats including
{ "to": [{ "email": ["john.doe#example.com", "sendgridtesting#gmail.com" ] }] }
It seemed to be the limit from azure function. But not sure where goes wrong yet. Please refer to the "bindings" below,
{
"bindings": [
{
"name": "telemetryEvent",
"type": "serviceBusTrigger",
"direction": "in",
"queueName": "threshold-email-queue",
"connection": "RootManageSharedAccessKey_SERVICEBUS",
"accessRights": "Manage"
},
{
"type": "sendGrid",
"name": "$return",
"apiKey": "SendGridKey",
"direction": "out",
"from": "ABC#sample.com",
"to": [{
"email": ["test1#sample1.com", "test2#sample2.com" ]
}]
}
],
"disabled": false
}

I did my example with a HTTP trigger, but based on this you'll be able to make it work with Service Bus trigger.
my function.json:
{
"bindings": [
{
"authLevel": "function",
"name": "req",
"type": "httpTrigger",
"direction": "in",
"methods": [
"get",
"post"
]
},
{
"type": "sendGrid",
"name": "mails",
"apiKey": "MySendGridKey",
"direction": "out",
"from":"samples#functions.com"
}
],
"disabled": false
}
My run.csx:
#r "SendGrid"
using System;
using System.Net;
using SendGrid.Helpers.Mail;
public static HttpResponseMessage Run(HttpRequestMessage req, TraceWriter log, ICollector<Mail> mails)
{
log.Info("C# HTTP trigger function processed a request.");
Mail message = new Mail()
{
Subject = $"Hello world from the SendGrid C#!"
};
var personalization = new Personalization();
personalization.AddTo(new Email("foo#bar.com"));
personalization.AddTo(new Email("foo2#bar.com"));
// you can add some more recipients here
Content content = new Content
{
Type = "text/plain",
Value = $"Hello world!"
};
message.AddContent(content);
message.AddPersonalization(personalization);
mails.Add(message);
return null;
}
I used this source to build my example:
Azure Function SendGrid

Thanks to Tamás Huj, the function can do the job now. So I post the solution in detail for others reference.
{
"bindings": [
{
"name": "telemetryEvent",
"type": "serviceBusTrigger",
"direction": "in",
"queueName": "threshold-email-queue",
"connection": "RootManageSharedAccessKey_SERVICEBUS",
"accessRights": "Manage"
},
{
"type": "sendGrid",
"name": "$return",
"apiKey": "SendGridKey",
"direction": "out",
"from": "ABC#sample.com"
}
],
"disabled": false
}
Then write the run.csx as:
#r "SendGrid"
#r "Newtonsoft.Json"
using System;
using SendGrid.Helpers.Mail;
using System.Threading.Tasks;
using Microsoft.Azure.WebJobs.Host;
using Newtonsoft.Json;
public static Mail Run(string telemetryEvent, TraceWriter log)
{
var telemetry = JsonConvert.DeserializeObject<Telemetry>(telemetryEvent);
Mail message = new Mail()
{
Subject = "Write your own subject"
};
var personalization = new Personalization();
personalization.AddBcc(new Email("sample1#test.com"));
personalization.AddTo(new Email("sample2#test.com"));
//add more Bcc,cc and to here as needed
Content content = new Content
{
Type = "text/plain",
Value = $"The temperature value is{temperature.Temperature}."
};
message.AddContent(content);
message.AddPersonalization(personalization);
return message;
}
public class Telemetry
{
public float Temperature { get; set; }
}

Dynamic output file name of ApiHubFile Azure Function binding (one drive, drop box etc)

I have an Azure Function with Timer Trigger, and then I want to generate a file with dynamic (defined in runtime) name and contents and save it to e.g. OneDrive.
My function code:
public static void Run(TimerInfo myTimer, out string filename, out string content)
{
filename = $"{DateTime.Now}.txt";
content = $"Generated at {DateTime.Now} by Azure Functions";
}
And function.json:
{
"bindings": [
{
"name": "myTimer",
"type": "timerTrigger",
"direction": "in",
"schedule": "0 */5 * * * *"
},
{
"type": "apiHubFile",
"name": "content",
"path": "{filename}",
"connection": "onedrive_ONEDRIVE",
"direction": "out"
}
],
"disabled": false
}
This fails though, with
Error indexing method 'Functions.TimerTriggerCSharp1'. Microsoft.Azure.WebJobs.Host:
Cannot bind parameter 'filename' to type String&. Make sure the parameter Type
is supported by the binding. If you're using binding extensions
(e.g. ServiceBus, Timers, etc.) make sure you've called the registration method
for the extension(s) in your startup code (e.g. config.UseServiceBus(),
config.UseTimers(), etc.).

Here is how you could do it:
#r "Microsoft.Azure.WebJobs.Extensions.ApiHub"
using System;
using System.IO;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Host.Bindings.Runtime;
public static async Task Run(TimerInfo myTimer, TraceWriter log, Binder binder)
{
log.Info($"C# Timer trigger function executed at: {DateTime.Now}");
var fileName = "mypath/" + DateTime.Now.ToString("yyyy-MM-ddThh-mm-ss") + ".txt";
var attributes = new Attribute[]
{
new ApiHubFileAttribute("onedrive_ONEDRIVE", fileName, FileAccess.Write)
};
var writer = await binder.BindAsync<TextWriter>(attributes);
var content = $"Generated at {DateTime.Now} by Azure Functions";
writer.Write(content);
}
And the function.json file:
{
"bindings": [
{
"name": "myTimer",
"type": "timerTrigger",
"direction": "in",
"schedule": "10 * * * * *"
},
{
"type": "apiHubFile",
"name": "outputFile",
"connection": "onedrive_ONEDRIVE",
"direction": "out"
}
],
"disabled": false
}
You shouldn't really need the apiHubFile declaration in your function.json but because of a bug I noticed today it should still be there. we will fix that bug.

To have full control over the name and path of an output during function execution, you need to use imperative binding
For example: function.json
{
"type": "blob",
"name": "outputBinder",
"path": "export/test",
"connection": "AzureWebJobsStorage",
"direction": "out"
},
Function:
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log, IBinder outputBinder)
{
var attribute new BlobAttribute($"{some dynamic path}/{some dynamic filename}", FileAccess.Write);
using (var stream = await outputBinder.BindAsync<Stream>(attribute))
{
// do whatever you want with this stream here...
}
}

Connecting Azure Function to Azure Storage Blob with HTTP trigger

I came across multiple ways of connecting Azure Storage Blobs to Azure (like this one for example) Functions but all of them require me to use a BlockBlob type parameter in my Run function, therefore replacing the HTTPRequestMessage parameter I need. Is there a way to keep the HTTPRequestMessage parameter and connect to Azure Storage Blob?
Ultimately, I need to get a file reference from the blob to send to another service via Azure Function.
When I try to add more parameters to Run, the function compiles properly, but I am returned a 500 error. When I change the parameters back to two, it works properly. The only difference is the parameter and function.json to which I add a section resulting in the entire file looking like this :
{
"bindings": [
{
"authLevel": "function",
"name": "req",
"type": "httpTrigger",
"direction": "in",
"methods": [
"get",
"post"
]
},
{
"type": "blob",
"name": "myBlobbo",
"path": "mycontainer",
"connection": "value",
"direction": "inout"
},
{
"name": "$return",
"type": "http",
"direction": "out"
}
],
"disabled": false
}
// Alright, now the logs are telling me that I didn't specify a connection string, even though I have a local.settings.json file with this inside:
{
"ConnectionStrings":
{
"xyz": "DefaultEndpointsProtocol=https;AccountName=xxx;AccountKey=yyy;EndpointSuffix=core.windows.net"
}
}
I'm probably going to just connect manually via passing an URI to CloudBlobContainer and using a file stream or %TEMP% to pass the contents, but I still would very much like to know how to get this binding to work.
// I'm using Azure environment to develop the function.

Following example shows how to get blob content with HttpRequest (HttpTrigger, Blob input, Http out):
run.csx
using System.Net;
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, string inputBlob, TraceWriter log)
{
log.Info("Blob content: " + inputBlob);
return req.CreateResponse(HttpStatusCode.OK, inputBlob);
}
functions.json
{
"bindings": [
{
"authLevel": "function",
"name": "req",
"type": "httpTrigger",
"direction": "in",
"methods": [
"get",
"post"
]
},
{
"name": "$return",
"type": "http",
"direction": "out"
},
{
"type": "blob",
"name": "inputBlob",
"path": "incontainer/myblob.txt",
"connection": "AzureWebJobsDashboard",
"direction": "in"
}
],
"disabled": false
}
storage:
AzureWebJobsDashboard: