Develop Reference

Send Azure SignalR message from Azure Function with CosmosDB Trigger

I’m developing a app that used CosmosDB to store data and then when anyone updates the data i want the clients to be updated.
For this i have decided to use the changefeed and then Azure Functions and Azure SignalR.
I have set up 2 functions.
A negotiate function (This one works and the clients connect correctly to the SignalR server)
And a OnDocumentsChanged function, and my problem is getting the function to actually sending the message, when something is changed.
I have the following function:
[FunctionName("OnDocumentsChanged")]
public static async Task Run(
[CosmosDBTrigger(
databaseName: "NewOrder",
collectionName: "NewOrder",
CreateLeaseCollectionIfNotExists = true,
ConnectionStringSetting = "myserver_DOCUMENTDB",
LeaseCollectionName = "leases")]
IReadOnlyList<Document> updatedNewOrder,
[SignalR(ConnectionStringSetting = "AzureSignalRConnectionString", HubName = "NewOrder")] IAsyncCollector<SignalRMessage> signalRMessages,
ILogger log)
{
if (updatedNewOrder != null && updatedNewOrder.Count > 0)
{
foreach (var Orders in updatedNewOrder)
{
await signalRMessages.AddAsync(new SignalRMessage
{
Target = "NewOrderUpdated",
Arguments = new[] { Orders.Id }
});
}
}
}
I can see that it is correctly triggered when a change is made to the database, but no messages are send.
I guess I’m missing a out part that actually send the SignalRMessages I’m just not sure how to implement.
Thanks.

How to send data to Service Bus Topic with Azure Functions?

I have default C# based HTTP Trigger here and I wish to send data "Hello Name" to Service Bus Topic (already created). I'm coding at portal.
How to do it Service Bus output binding?
This is not working. Any help available?
-Reference missing for handling Service Bus?
-How to define Connection of service bus? Where is Functions.json
-How to send a message to service bus?
//This FunctionApp get triggered by HTTP and send message to Azure Service Bus
using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
namespace Company.Function
{
public static class HttpTriggerCSharp1
{
[FunctionName("HttpTriggerCSharp1")]
[return: ServiceBus("myqueue", Connection = "ServiceBusConnection")] // I added this for SB Output. Where to define.
public static async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
string name = req.Query["name"];
string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
dynamic data = JsonConvert.DeserializeObject(requestBody);
name = name ?? data?.name;
string responseMessage = string.IsNullOrEmpty(name)
? "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response."
: $"Hello, {name}. This HTTP triggered function executed successfully.";
return new OkObjectResult(responseMessage);
// I added this for SB Output
return responseMessage;
}
}
}

Firstly, there are two bindings to send data to service bus. Firstly is what you show, using the return binding, after install two packages Microsoft.Azure.WebJobs.Extensions.ServiceBus and WindowsAzure.ServiceBus, then you will be able to send data. And you could not do it cause your function type is IActionResult and you are trying to return string(responseMessage).
So if you want to send the whole responseMessage, just return new OkObjectResult(responseMessage);, it will work. And the result would be like below pic.
And if you want to use return responseMessage; should change your method type to string, it will be public static async Task<string> RunAsync and result will be below.
Another binding you could refer to below code or this sample.
[FunctionName("Function1")]
[return: ServiceBus("myqueue", Connection = "ServiceBusConnection")]
public static async Task RunAsync(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
[ServiceBus("myqueue", Connection = "ServiceBusConnection")] MessageSender messagesQueue,
ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
string name = req.Query["name"];
string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
dynamic data = JsonConvert.DeserializeObject(requestBody);
name = name ?? data?.name;
string responseMessage = string.IsNullOrEmpty(name)
? "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response."
: $"Hello, {name}. This HTTP triggered function executed successfully.";
byte[] bytes = Encoding.ASCII.GetBytes(responseMessage);
Message m1 = new Message(bytes);
await messagesQueue.SendAsync(m1);
}
How to define Connection of service bus? Where is Functions.json
In the local you should define the connection in the local.settings.jon, you could use any name with the connection, then in the binding Connection value should be the name you set in the json file. And cause you are using c#, so you could not modify the function.json file, there will be a function.json file in the debug folder. So you could only change the binding in the code.
Hope this could help you, if you still have other problem , please feel free to let me know.

Make sure you first install Microsoft.Azure.WebJobs.Extensions.ServiceBus NuGet package. Then make sure you are using it in your project:
using Microsoft.Azure.WebJobs.Extensions.ServiceBus;
Make sure you clean and build the project to make sure you have no errors.
Then you need to make sure you have a "ServiceBusConnection" connection string inside your local.settings.json file:
{
"IsEncrypted": false,
"Values": {
"FUNCTIONS_WORKER_RUNTIME": "dotnet",
"ServiceBusConnection": "Endpoint=sb://...",
}
}
Which you can get if you go to Azure portal -> Service bus namespace -> Shared access policies -> RootManageSharedAccessKey -> Primary Connection String. Copy and paste this connection string inside "ServiceBusConnection". You can also use the Secondary Connection String as well.
Note: Service bus queues/topics have shared access policies as well. So if you don't want to use the Service bus namespace level access policies, you can create one at queue/topic level, so you your function app only has access to the queue/topic defined in your namespace.
Also if you decide to publish your function app, you will need to make sure you create a configuration application setting for "ServiceBusConnection", since local.settings.json is only used for local testing.

Azure HTTP function failing to publish

I am attempting to publish my Azure HTTP function from Visual Studio Code to our Azure platform.
The code works fine when running the function locally and publishes successfully but throws out the following error when published.
I have tried using DocumentDB instead of CosmosDB but that lacks the insert functionality required for inserting data into CosmosDB. Stackoverflow has no solutions to a problem this specific.
Function code
//write to cosmosdb
[FunctionName("InsertItem")]
public static HttpResponseMessage Run(
[HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)]HttpRequestMessage req,
[CosmosDB(
databaseName: "ToDoList",
collectionName: "RFIDContainer",
ConnectionStringSetting = "myCosmosDBConnection")]
out RFIDBaseTag document,
ILogger log)
{
string hexData = "";
string afi = "";
string eid = "";
string dsfid = "";
//Guid DeviceID = new Guid();
//Guid AppID = new Guid();
var content = req.Content;
string jsonContent = content.ReadAsStringAsync().Result;
dynamic json = JsonConvert.DeserializeObject<MyClass>(jsonContent);
hexData = json?.hexData;
afi = json?.afi;
eid = json?.eid;
dsfid = json?.dsfid;
/*Guid devGuid;
Guid.TryParse(json.AppID.ToString(), out devGuid);
DeviceID = devGuid;
Guid appGuid;
Guid.TryParse(json.AppID.ToString(), out appGuid);
AppID = appGuid;*/
byte[] hexToByte = AzureRFIDTagReader.StringToByteArray(hexData);
RawRFIDReading raw = new RawRFIDReading();
raw.afi = afi;
raw.eid = eid;
raw.dsfid = dsfid;
raw.RawData = hexToByte;
RFIDBaseTag rtag = RFIDTagFactory.GetTag(raw);
string serializedtag = JsonConvert.SerializeObject(rtag);
//document = JsonConvert.DeserializeObject<MyClass>(jsonContent);
//document = JsonConvert.DeserializeObject<RFIDBaseTag(serializedtag);
document = rtag;
log.LogInformation($"C# Queue trigger function inserted one row");
return new HttpResponseMessage(HttpStatusCode.Created);
}
local.settings.json
{
"IsEncrypted": false,
"Values": {
"AzureWebJobsStorage": "DefaultEndpointsProtocol=https;AccountName=xxxx;AccountKey=zzzz",
"myCosmosDBConnection": "AccountEndpoint=xxx:443/;AccountKey=www;"
}
}
Error Message:
Function (xxx/InsertItem) Error: Microsoft.Azure.WebJobs.Host: Error indexing method 'InsertItem'. Microsoft.Azure.WebJobs.Host: Unable to resolve the value for property 'CosmosDBAttribute.ConnectionStringSetting'. Make sure the setting exists and has a valid value.
I am able to post to the function locally but not on Azure.
Any suggestions?

When you publish your Function, your local.settings.json file is not published.
You need to add those settings as part of the Azure Functions Application Settings. In your case, you need to add myCosmosDBConnection there with the value.

Error when trying to access Azure Function

I have an anonymous function on Azure, successfully deployed (.netstandard 2.0), using Microsoft.NET.Sdk.Functions (1.0.13), but for some reason suddenly it stopped working and when I call it the response is:
<ApiErrorModel xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/Microsoft.Azure.WebJobs.Script.WebHost.Models">
<Arguments xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" i:nil="true"/>
<ErrorCode>0</ErrorCode>
<ErrorDetails i:nil="true"/>
<Id>91fab400-3447-4913-878f-715d9d4ab46b</Id>
<Message>
An error has occurred. For more information, please check the logs for error ID 91fab400-3447-4913-878f-715d9d4ab46b
</Message>
<RequestId>0fb00298-733d-4d88-9e73-c328d024e1bb</RequestId>
<StatusCode>InternalServerError</StatusCode>
</ApiErrorModel>
How to figure that out?
EDIT: When I start AF environment locally and run the function it works as expected, without any issues, although what i see in console is a message in red:
and searching for it, stumbled across this GitHub post:
https://github.com/Azure/azure-functions-host/issues/2765
where I noticed this part:
#m-demydiuk noticed that azure function works with this error in the console. So this red error doesn't break function on the local machine. But I am afraid it may cause any problems in other environments.
and it bothers me. Can it be the problem?
I use a lib with a version that do not match my target framework, but again locally works fine, and also it was working fine before on Azure
My host version is "Version=2.0.11651.0"
This is the entire function:
public static class Function1
{
[FunctionName("HTML2IMG")]
public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]HttpRequest req, TraceWriter log)
{
string url = req.Query["url"];
byte[] EncodedData = Convert.FromBase64String(url);
string DecodedURL = Encoding.UTF8.GetString(EncodedData);
string requestBody = new StreamReader(req.Body).ReadToEnd();
dynamic data = JsonConvert.DeserializeObject(requestBody);
DecodedURL = DecodedURL ?? data?.name;
var api = new HtmlToPdfOrImage.Api("9123314e-219c-342d-a763-0a3dsdf8ad21", "vmZ31vyg");
var ApiResult = api.Convert(new Uri($"{DecodedURL}"), new HtmlToPdfOrImage.GenerateSettings() { OutputType = HtmlToPdfOrImage.OutputType.Image });
string BlobName = Guid.NewGuid().ToString("n");
string ImageURL = await CreateBlob($"{BlobName}.png", (byte[])ApiResult.model, log);
var Result = new HttpResponseMessage(HttpStatusCode.OK);
var oJSON = new { url = ImageURL, hash = BlobName };
var jsonToReturn = JsonConvert.SerializeObject(oJSON);
Result.Content = new StringContent(jsonToReturn);
Result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
return Result;
}
private async static Task<string> CreateBlob(string name, byte[] data, TraceWriter log)
{
string accessKey = "xxx";
string accountName = "xxx";
string connectionString = "DefaultEndpointsProtocol=https;AccountName=" + accountName + ";AccountKey=" + accessKey + ";EndpointSuffix=core.windows.net";
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString);
CloudBlobClient client = storageAccount.CreateCloudBlobClient();
CloudBlobContainer container = client.GetContainerReference("images");
await container.CreateIfNotExistsAsync();
BlobContainerPermissions permissions = await container.GetPermissionsAsync();
permissions.PublicAccess = BlobContainerPublicAccessType.Container;
await container.SetPermissionsAsync(permissions);
CloudBlockBlob blob = container.GetBlockBlobReference(name);
blob.Properties.ContentType = "image/png";
using (Stream stream = new MemoryStream(data))
{
await blob.UploadFromStreamAsync(stream);
}
return blob.Uri.AbsoluteUri;
}
DOUBLE EDIT:
I created empty V2 .net core AF in VS and published it straight away -> i get the same error... I even updated the Microsoft.NET.Sdk.Function to the latest 1.0.14 instead of 1.0.13 and still get the same error. Obviously something in Azure or Visual Studio (15.7.5) is broken?!?!

Solution
On Azure portal, go to Function app settings check your Runtime Version. It is probably Runtime version: 1.0.11913.0 (~1) on your side. This is the problem. Change FUNCTIONS_EXTENSION_VERSION to beta in Application settings and your code should work on Azure.
Explanation
You create a v2 function as your local host version is 2.0.11651.0. So the function runtime should also be beta 2.x(latest is 2.0.11933.0) online.
When you published functions from VS before, you probably saw this prompt
You may have chosen No so that you got the error.
Note that if we publish through CI/CD like VSTS or Git, such notification is not available. So we need to make sure those configurations are set correctly.
Suggestions
As you can see your local host version is 2.0.11651, which is lower than 2.0.11933 on Azure. I do recommend you to update Azure Functions and Web Jobs Tools(on VS menus, Tools->Extensions and Updates) to latest(15.0.40617.0) for VS to consume latest function runtime.
As for your code, I recommend you to create images container and set its public access level manually on portal since this process only requires executing once.
Then we can use blob output bindings.
Add StorageConnection to Application settings with storage connection string. If your images container is in the storage account used by function app (AzureWebJobsStorge in Application settings), ignore this step and delete Connection parameter below, because bindings use that storage account by default.
Add blob output bindings
public static async Task<HttpResponseMessage> Run(...,TraceWriter log,
[Blob("images", FileAccess.Read, Connection = "StorageConnection")] CloudBlobContainer container)
Change CreateBlob method
private async static Task<string> CreateBlob(string name, byte[] data, TraceWriter log, CloudBlobContainer container)
{
CloudBlockBlob blob = container.GetBlockBlobReference(name);
blob.Properties.ContentType = "image/png";
using (Stream stream = new MemoryStream(data))
{
await blob.UploadFromStreamAsync(stream);
}
return blob.Uri.AbsoluteUri;
}

DocumentDB with Azure Functions

I'm trying to connect an Azure DocumentDB and save documents using Azure Functions but I don't know how to create the connection.

You can do it using the Azure Portal.
After you created the DocumentDB -
Create new Azure Function.
Go to the Integrate Tab.
You can choose Azure Document DB as an output for your function.
Choose your Document DB/Database Name/Collection you want to use.
Document parameter name is the Output of your function.
For example
using System;
public static void Run(string input, out object document, TraceWriter log)
{
log.Info($"C# manually triggered function called with input: {input}");
document = new {
text = $"I'm running in a C# function! {input}"
};
}
you need to provide out object which is the same as you defined in the output tab.

You can just use the document client directly:
var endpoint = "https://XXXXX.documents.azure.com:443/";
var authKey = "XXXXX";
using (var client = new DocumentClient(new Uri(endpoint), authKey))
{
var sqlCountQuery = "select value count(1) from c";
IDocumentQuery<dynamic> query = client.CreateDocumentQuery<dynamic>(UriFactory.CreateDocumentCollectionUri("YOUR_DB_ID", "YOUR_COLLECTON_ID"), sqlCountQuery).AsDocumentQuery();
....
}

Azure Functions supports Document DB (Cosmos DB) out-of-the-box. You can just simply add an environment variable called AzureWebJobsDocumentDBConnectionString in V1 or AzureWebJobsCosmosDBConnectionString in V2.
Then just use a CosmosDBTrigger binding attribute for input binding like (in C# for example):
public static class UpsertProductCosmosDbTrigger
{
[FunctionName("ProductUpsertCosmosDbTrigger")]
public static void Run(
[CosmosDBTrigger(
// Those names come from the application settings.
// Those names can come with both preceding % and trailing %.
databaseName: "CosmosDbDdatabaseName",
collectionName: "CosmosDbCollectionName",
LeaseDatabaseName = "CosmosDbDdatabaseName",
LeaseCollectionName = "CosmosDbLeaseCollectionName")]
IReadOnlyList<Document> input,
TraceWriter log)
...
For output binding use DocumentDB output binding attribute in V1 and CosmosDB in V2 like:
[FunctionName("ProductUpsertHttpTrigger")]
public static async Task<HttpResponseMessage> Run(
[HttpTrigger(AuthorizationLevel.Function, "post", Route = "products")]
HttpRequestMessage req,
[DocumentDB(
databaseName: "%CosmosDbDdatabaseName%",
collectionName: "%CosmosDbCollectionName%")] IAsyncCollector<Product> collector,
TraceWriter log)
...
I've written a blog post about this: https://blog.mexia.com.au/cosmos-db-in-azure-functions-v1-and-v2

var EndpointUrl = "EndpointUrl";
var PrimaryKey = "PrimaryKeyValue"
this.client = new DocumentClient(new Uri(EndpointUrl), PrimaryKey);
Database database = await this.client.CreateDatabaseIfNotExistsAsync(new Database { Id = cosmoDbName });
you can get the End-point-URL and Primary-Key value from the azure portal in the keys section.

Assume C# has similar SDK like Java. The below is for Java
There are two ways you can connect to documentDB from an Azure function.
Using SDK
DocumentClient documentClient = new DocumentClient(
"SERVICE_ENDPOINT",
"MASTER_KEY",
ConnectionPolicy.GetDefault(),
ConsistencyLevel.Session);
Refer - [https://learn.microsoft.com/en-us/azure/cosmos-db/sql-api-java-samples][1]. This has .Net Samples too.
Binding
#FunctionName("CosmosDBStore")
#CosmosDBOutput(name = "database",
databaseName = "db_name",
collectionName = "col_name",
connectionStringSetting = "AzureCosmosDBConnection")
Please make sure you have a variable in the name of "AzureCosmosDBConnection" in your application settings and local.settings.json(if you want to test locally)
Refer - [https://learn.microsoft.com/en-us/azure/azure-functions/functions-bindings-cosmosdb-v2][1]
The above link has C# example too.