« Lambda » : différence entre les versions

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= .NET 8 =
= .NET 8 =

Version du 12 avril 2024 à 14:04

Links

Description

Serverless service / Function as a service allowing to run code without having to worry about underlying hardware and OS.
Event driven: the lambda is triggered by an event.
Pay only for what you use: per request and based on the duration of the code execution.

Use cases

  • Data transformation (Kinesis Data Stream as input)
  • File processing (when uploaded to S3 bucket)
  • Website backend microservice
  • Scheduled tasks

Bad use cases

  • Long running processes (timeout after 15mn)
  • Constant workload (no scalability and high cost)
  • Large code base (needed to be loaded at startup)
  • State management (lambda are stateless)

Anti-patterns

  • Monolithic function
    • increase package size
    • hard to enforce least privilege permissions
    • hard to upgrade, maintain and test
  • Recursion
    • endless loop
  • Orchestration
    • avoid complex workflow logic
    • ties lambda with other systems
    • instead consider AWS Step Functions or EventBridge
  • Chaining (synchronously invoke another lambda)
    • instead use EventBridge or QueueService
  • Waiting (synchronously call services or databases)
    • instead use asynchronous calls

Runtime

  • OS
  • Libraries
  • Programming language (.NET, Node.js, Python, Go, Ruby, Java)

.NET 8

scenario description
Native AOT
Custom Runtime Function to use .NET 8
Container Image lambda function package as a container image

Debug locally

On VS, if the extension AWS Toolkit is installed you have the AWS .NET Mock Lambda Test Tool available.
A debug configuration is created for you lambda.

Properties\launchSettings.json
{
  "profiles": {
    "Mock Lambda Test Tool": {
      "commandName": "Executable",
      "commandLineArgs": "--port 5050",
      "executablePath": "<home-directory>\\.dotnet\\tools\\dotnet-lambda-test-tool-6.0.exe",
      "workingDirectory": ".\\bin\\Debug\\net6.0"
    }
  }
}

Deployment

Lambda function handler in C#

For class libraries: ASSEMBLY::TYPE::METHOD

Call a lambda from code

Cs.svg
var jsonSerializerOptions = new JsonSerializerOptions
{
    PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
    Converters = { new JsonStringEnumConverter() }
};

var amazonLambdaClient = new AmazonLambdaClient();

var request = new InvokeRequest
{
    FunctionName = functionName,
    Payload = JsonSerializer.Serialize(myObject, jsonSerializerOptions),
    LogType = LogType.Tail
};
var response = await this.amazonLambdaClient.InvokeAsync(request);

if(response.HttpStatusCode == System.Net.HttpStatusCode.OK)
{
    var payload = Encoding.ASCII.GetString(response.Payload.ToArray()); // to debug only
    var result = JsonSerializer.Deserialize<AwsJobResult<LambdaJob>>(response.Payload, jsonSerializerOptions);
}