// this will build a mock ApiRequest/Response and record the logs/metrics of the underlying mvc middleware
public static RequestDelegate WithAlteredAspNet(RequestDelegate aspnet, CloudwatchLogsSink cloudwatchLogs, CloudwatchMetricsSink cloudwatchMetrics)
{
return(async(httpContext) =>
{
var request = httpContext.Request;
var mvcRequest = new AlteredApiRequest
{
Path = request.Path,
HttpMethod = request.Method,
Headers = request.Headers,
QueryStringParameters = QueryHelpers.ParseQuery(request.QueryString.Value)
};
var pipeline = new AlteredPipeline <AlteredApiRequest, AlteredApiResponse>(async(_) =>
{
await aspnet(httpContext);
var mvcResponse = new AlteredApiResponse
{
StatusCode = httpContext.Response.StatusCode,
Headers = httpContext.Response?.Headers
};
return mvcResponse;
})
.WithCloudwatchLogs(cloudwatchLogs, mvcRequest.Path)
.WithCloudwatchMetrics(cloudwatchMetrics, mvcRequest.Path);
var response = await pipeline.Execute(mvcRequest);
});
}
// todo https://docs.aws.amazon.com/general/latest/gr/sigv4-signed-request-examples.html
// https://docs.aws.amazon.com/general/latest/gr/sigv4_elements.html
public static AlteredApiRequest WithAws(this AlteredApiRequest request)
{
var amzDate = DateTime.UtcNow.ToString("YYYYMMDD'T'HHMMSS'Z'");
request.Headers["x-amz-date"] = amzDate;
return(request);
}
// translate MvcRequest/Response into aspnet RequestDelegate
public static RequestDelegate ToAlteredAspNet(this IAlteredPipeline <AlteredApiRequest, AlteredApiResponse> pipeline) =>
async(httpContext) =>
{
var request = httpContext.Request;
using (var bodyReader = new StreamReader(request.Body))
{
var mvcRequest = new AlteredApiRequest
{
Path = request.Path,
HttpMethod = request.Method,
Headers = request.Headers,
QueryStringParameters = QueryHelpers.ParseQuery(request.QueryString.Value)
};
if (request.Body?.CanRead == true)
{
mvcRequest.Body = await bodyReader.ReadToEndAsync();
}
var mvcResponse = await pipeline.Execute(mvcRequest);
var response = httpContext.Response;
response.StatusCode = mvcResponse.StatusCode;
foreach (var kvp in mvcResponse.Headers)
{
response.Headers[kvp.Key] = kvp.Value;
}
if (!string.IsNullOrEmpty(mvcResponse.Body))
{
//response.ContentLength = mvcResponse.Body.Length;
response.ContentType = response.Headers[HeaderNames.ContentType];
using (var bodyWriter = new StreamWriter(response.Body))
{
await bodyWriter.WriteAsync(mvcResponse.Body);
}
}
}
};
public Lambda(IAlteredPipeline <AlteredApiRequest, AlteredApiResponse> pipeline) : base(async(request) =>
{
var body = request.IsBase64Encoded ?
Convert.ToBase64String(Encoding.UTF8.GetBytes(request.Body)) :
request.Body;
var mvcRequest = new AlteredApiRequest
{
Path = request.Path,
HttpMethod = request.HttpMethod,
Headers = request.Headers.ToDictionary(kvp => kvp.Key, kvp => new StringValues(kvp.Value)),
QueryStringParameters = request.QueryStringParameters.ToDictionary(kvp => kvp.Key, kvp => new StringValues(kvp.Value)),
Body = body
};
try
{
var mvcResponse = await pipeline.Execute(mvcRequest);
var response = new ApplicationLoadBalancerResponse
{
StatusCode = mvcResponse.StatusCode,
Headers = mvcResponse.Headers.ToDictionary(kvp => kvp.Key, kvp => kvp.Value.ToString()),
Body = mvcResponse.Body
};
return(response);
}
catch (Exception e)
{
// lambda will write error + request if thrown to
Console.Error.WriteLine(AlteredJson.SerializeObject(new
{
e.Message,
e.Source,
StackTrace = new StackTrace(e).ToString(),
e.Data
}));
Console.Out.WriteLine(AlteredJson.SerializeObject(mvcRequest));
throw e;
}
})
{ }
