How do I use docuementdb binding with azure function http binding:
using System.Net;
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, out object locationDocument, TraceWriter log){
log.Info("C# HTTP trigger function processed a request.");
var data = await req.Content.ReadAsStringAsync();
return req.CreateResponse(HttpStatusCode.OK, $"{data}");
}
Getting this error:
error CS1988: Async methods cannot have ref or out parameters
This is not specific to Document DB. If your function is async, and you already used the return value for HTTP output binding, you would need to inject IAsyncCollector<T> for all other output bindings.
See the second example in this answer.
Related
I've created a test HTTP Trigger azure function. I can trigger it correctly on azure portal and browser. However trigger from Unity editor gives "Error HTTP/1.1 500 Internal Server Error".
starting Azure function:
public static async Task<IActionResult> Run(HttpRequest req, ILogger log){
log.LogInformation("C# HTTP trigger function processed a request.");
string name = req.Query["name"];
string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
dynamic data = JsonConvert.DeserializeObject(requestBody);
name = name ?? data?.name;
return name != null
? (ActionResult)new OkObjectResult($"Hello, {name}")
: new BadRequestObjectResult("Please pass a name on the query string or in the request body");}
My Unity code:
formData.Add(new MultipartFormDataSection("name", "SampleName", "text/plain"));
UnityWebRequest www = UnityWebRequest.Post("https://samplefunction.azurewebsites.net/api/HttpTriggerTest?herelongblob", formData);
yield return www.SendWebRequest();
Azure CORS configuration: Request Credentials ON: Enable Access-Control-Allow-Credentials.
Function is setup always on. Integrate-Trigger: selected methods GET, POST. Authorisation level:Function.
function's host.json: "version": "2.0", "extensionBundle": { "id": "Microsoft.Azure.Functions.ExtensionBundle", "version": "[1.*, 2.0.0)"
App Service authentication:Anonymous
Unity-Azure sdk and google setup search results seems all outdated/not supported :(
What route should I take to get this to work please? happy to try any sdk / unity asset store to reach azure you may suggest! Cheers!
The error occurs in the two lines below in your code:
string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
dynamic data = JsonConvert.DeserializeObject(requestBody);
Since you set text/plain in your code. So when you do the www.SendWebRequest(), it will send a form data but not a json format data. So it will show the error message.
Below I provide the code for your reference:
public static async Task<IActionResult> Run(HttpRequest req, ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
var arr = req.Form.Keys;
foreach (var key in arr) {
log.LogInformation(key);
log.LogInformation(req.Form[key]);
}
return (ActionResult)new OkObjectResult("success");
}
You can get the key and the value of the form data in the code above and then compose them to json format and then do DeserializeObject. Or if you want to use the data to create a object, you can even do not do DeserializeObject and just set the value into your object directly.
By the way, you can also try to change the text/plain to application/json in your code new MultipartFormDataSection("name", "SampleName", "text/plain"). But, as I don't know much about MultipartFormDataSection, so I'm not sure if this solution can work.
Hope it helps.
I have an azure function which returns a service bus message. However, I want to conditionally return a service bus message, instead of being forced to return the message every time.
here is an example
[FunctionName("ServiceBusOutput")]
[return: ServiceBus("myqueue", Connection = "ServiceBusConnection")]
public static string ServiceBusOutput([HttpTrigger] dynamic input, ILogger log)
{
log.LogInformation($"C# function processed: {input.Text}");
// check condition here, abort return completely
// Otherwise, return
return input.Text;
}
Said another way, I want to return a message on a service bus when certain conditions apply within the function code block. Is this possible?
One idea that does not work is to throw an exception. However, this just results in the message being placed into the DL queue. I want to completely abort the operation of returning the message on the service bus, and avoid DL.
Another idea that does not work is to simply execute
return;
But this results in compile-time error, which is sort of expected
"An object of a type convertible to 'MyReturnType1' is required"
I can think of a hack which I dont like, which is to return null, and handle the null later in the chain. But this is sort of dirty to me.
You could just bind ServiceBus as MessageSender type, then use the SendAsync() method to send the message.
The below is my test code, if the request name equals "george", it will send the name to the message queue.
public static class Function1
{
[FunctionName("Function1")]
public static async System.Threading.Tasks.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;
if (name.Equals("george")) {
byte[] bytes = Encoding.ASCII.GetBytes(name);
Message m1 = new Message();
m1.Body = bytes;
await messagesQueue.SendAsync(m1);
}
}
}
Suppose this is what you want, hope this could help you, if you still have other problem please feel free to let me know.
Instead of using the output binding available in Azure Function, you can send a message to the queue from a custom queue client created inside the function.
Posting the message based on a condition is not possible with the bindings.
I have an azure function taking in messages from an Azure service bus queue and sending documents to cosmosDB. I'm using Azure functions 1.x:
public static class Function1
{
[FunctionName("Function1")]
public static void Run([ServiceBusTrigger("ServiceBusQueue", AccessRights.Manage, Connection = "ServiceBusQueueConnection")]BrokeredMessage current, [DocumentDB(
databaseName: "DBname",
collectionName: "Colname",
ConnectionStringSetting = "CosmosDBConnection")]out dynamic document, TraceWriter log)
{
document = current.GetBody<MyObject>();
log.Info($"C# ServiceBus queue triggered function processed the message and sent to cosmos");
}
}
This inserts to cosmos successfully, but when updating I get errors:
Microsoft.Azure.Documents.DocumentClintException: Entity with the specified id already exists in the system.
They key I'm trying to update on is the partition key of that collection.
I saw this question: Azure function C#: Create or replace document in cosmos db on HTTP request
But It seems like my usage is similar to the one in Matias Quarantas answer. Also he mentioned that using an out parameter causes an upsert on cosmos.
How can I create this "upsert" function, while still using azure function 1.x?
The binding does indeed do an Upsert operation.
I created this sample Function that takes an Http payload (JSON) and stores it in Cosmos DB as-is:
[FunctionName("Function1")]
public static HttpResponseMessage Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]HttpRequestMessage req,
[DocumentDB("MyDb", "MyCollection", ConnectionStringSetting = "MyCosmosConnectionString")] out dynamic document,
TraceWriter log)
{
log.Info("C# HTTP trigger function processed a request.");
dynamic data = req.Content.ReadAsAsync<object>().GetAwaiter().GetResult();
document = data;
return req.CreateResponse(HttpStatusCode.OK);
}
If I send a JSON payload to the Http endpoint, the output binding works as expected:
When I check the Data Explorer, I see:
If I send a second payload, this time, adding a property (same id):
The Data Explorer shows the document was updated, with the same Function code:
Can you add the full Exception/Error trace? Is your Service Bus Message including an "id"? Is your collection partitioned?
If your collection is partitioned and you are changing the value of the Partition key property, then the binding won't update the existing document, it will create a new one because the Upsert operation won't find an existing document (based on the id/partition key). But it won't throw an exception.
I have an HTTP Trigger Azure Function which is currently in 1.x. The code is as below:
using System.Net;
using System.Threading.Tasks;
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
{
log.Info($"C# HTTP trigger function processed a request. RequestUri={req.RequestUri}");
// parse query parameter
string name = req.GetQueryNameValuePairs()
.FirstOrDefault(q => string.Compare(q.Key, "name", true) == 0)
.Value;
// Get request body
dynamic data = await req.Content.ReadAsAsync<object>();
// Set name to query string or body data
name = name ?? data?.name;
return name == null
? req.CreateResponse(HttpStatusCode.BadRequest, "Please pass a name on the query string or in the request body")
: req.CreateResponse(HttpStatusCode.OK, "Hello " + name);
}
While trying to upgrade it to 2.x, I am getting an issue with GetQueryNameValuePairs
I am getting error - 'HttpRequestMessage' does not contain a definition for 'GetQueryNameValuePairs'
Is there no support for this method in 2.0? How can this be accomplished in .net standard?
Function runtime 1.x is on Full .Net Framework, while 2.x runs on .NET Core env and our function code targets at .NET Standard.
For this class HttpRequestMessage, it doesn't have GetQueryNameValuePairs method in .NET Standard assembly.
Migrating from 1.x to 2.x usually needs work of code modification. Since it's just a template, I suggest you delete it and recreate a Http Trigger in 2.x runtime. You may see a different template work with .NET Standard.
Here is the sample code that looks up query string parameters in Functions V2.x
using System.Net;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Primitives;
public static IActionResult Run(HttpRequest req, TraceWriter log)
{
log.Info("C# HTTP trigger function processed a request.");
if (req.Query.TryGetValue("name", out StringValues value))
{
return new OkObjectResult($"Hello, {value.ToString()}");
}
return new BadRequestObjectResult("Please pass a name on the query string");
}
In Functions v2 this has changed to req.GetQueryParameterDictionary();
I want to make an Azure Function that takes a JSON body passed to it and inserts this document in to an Azure COSMOSDB instance.
To do so, I created this function in the Azure Functions Portal:
And implement the function like so:
#r "Newtonsoft.Json"
using Newtonsoft.Json.Linq;
using System.Net;
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log, object outputDocument)
{
var requestContent = await req.Content.ReadAsStringAsync();
log.Verbose($#"Received request:\n{requestContent}");
var newDoc = JObject.Parse(requestContent);
newDoc["Id"] = Guid.NewGuid().ToString();
newDoc["shardKey"] = newDoc.Value<string>(#"Id").Substring(8);
outputDocument = newDoc;
return req.CreateResponse(System.Net.HttpStatusCode.Created);
}
In the portal, I put in an easy sample doc:
{
"prop1": 2,
"prop2": "2017-02-20",
}
and click 'Run'
I'm immediately met with
as an overlay in the portal IDE along with
{
"id": "145ee924-f824-4064-8364-f96dc12ab138",
"requestId": "5a27c287-2c91-40f5-be52-6a79c7c86bc2",
"statusCode": 500,
"errorCode": 0,
"message": "'UploadDocumentToCosmos' can't be invoked from Azure WebJobs SDK. Is it missing Azure WebJobs SDK attributes?"
}
in the log area.
There seems to be nothing I can do to fix the issue, yet I sure feel like I'm doing everything right.
What do I need to do to simply take a JSON object as an HTTP Request to an Azure Function, and insert/upsert said object in to an Azure Cosmos DB instance??
For async functions you should use IAsyncCollector:
public static async Task<HttpResponseMessage> Run(
HttpRequestMessage req, TraceWriter log,
IAsyncCollector<object> outputDocuments)
{
...
await outputDocuments.AddAsync(newDoc);
}
Can you try adding out to dynamic outputDocument?
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log, out dynamic outputDocument)