public async Task Function_Can_Process_Multiple_Requests()
{
// Arrange
void Configure(IServiceCollection services)
{
services.AddLogging((builder) => builder.AddXUnit(this));
}
using var server = new LambdaTestServer(Configure);
using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(2));
await server.StartAsync(cts.Token);
var channels = new List <(int expected, ChannelReader <LambdaTestResponse> reader)>();
for (int i = 0; i < 10; i++)
{
var request = new MyRequest()
{
Values = Enumerable.Range(1, i + 1).ToArray(),
};
string json = JsonSerializer.Serialize(request);
channels.Add((request.Values.Sum(), await server.EnqueueAsync(json)));
}
_ = Task.Run(async() =>
{
foreach ((var _, var reader) in channels)
{
await reader.WaitToReadAsync(cts.Token);
}
if (!cts.IsCancellationRequested)
{
cts.Cancel();
}
});
using var httpClient = server.CreateClient();
// Act
await MyFunctionEntrypoint.RunAsync(httpClient, cts.Token);
// Assert
foreach ((int expected, var channel) in channels)
{
channel.TryRead(out var response).ShouldBeTrue();
response.ShouldNotBeNull();
response.IsSuccessful.ShouldBeTrue();
response.Content.ShouldNotBeNull();
var deserialized = JsonSerializer.Deserialize <MyResponse>(response.Content);
deserialized.Sum.ShouldBe(expected);
}
}
public Task <MyResponse> SumAsync(MyRequest request, ILambdaContext context)
{
context.Logger.LogLine($"Handling AWS request Id {context.AwsRequestId}.");
var response = new MyResponse()
{
Sum = request.Values.Sum(),
};
context.Logger.LogLine($"The sum of the {request.Values?.Count} values is {response.Sum}.");
return(Task.FromResult(response));
}
public static async Task Function_Can_Process_Request()
{
// Arrange - Create a test server for the Lambda runtime to use
using var server = new LambdaTestServer();
// Create a cancellation token that stops the server listening for new requests.
// Auto-cancel the server after 2 seconds in case something goes wrong and the request is not handled.
using var cancellationTokenSource = new CancellationTokenSource(TimeSpan.FromSeconds(2));
// Start the test server so it is ready to listen for requests from the Lambda runtime
await server.StartAsync(cancellationTokenSource.Token);
// Create a test request for the Lambda function being tested
var value = new MyRequest()
{
Values = new[] { 1, 2, 3 }, // The function returns the sum of the specified numbers
};
// Queue the request with the server to invoke the Lambda function and
// store the ChannelReader into a variable to use to read the response.
ChannelReader <LambdaTestResponse> reader = await server.EnqueueAsync(value);
// Queue a task to stop the test server from listening as soon as the response is available
_ = Task.Run(async() =>
{
await reader.WaitToReadAsync(cancellationTokenSource.Token);
if (!cancellationTokenSource.IsCancellationRequested)
{
cancellationTokenSource.Cancel();
}
});
// Create an HttpClient for the Lambda to use with LambdaBootstrap
using var httpClient = server.CreateClient();
// Act - Start the Lambda runtime and run until the cancellation token is signalled
await MyFunctionEntrypoint.RunAsync(httpClient, cancellationTokenSource.Token);
// Assert - The channel reader should have the response available
reader.TryRead(out LambdaTestResponse response).ShouldBeTrue("No Lambda response is available.");
response.ShouldNotBeNull("The Lambda response is null.");
response.IsSuccessful.ShouldBeTrue("The Lambda function failed to handle the request.");
response.Content.ShouldNotBeNull("The Lambda function did not return any content.");
string json = Encoding.UTF8.GetString(response.Content);
var actual = JsonConvert.DeserializeObject <MyResponse>(json);
actual.Sum.ShouldBe(6, "The Lambda function returned an incorrect response.");
}