API Summit Berlin
22 November 2016 - DevOps, C#, .NET, Visual Studio, Azure
Introduction
For the next two days, I will be at the first API Summit in Berlin. Given that I was member of the advisory board for that conference, I am very happy that it is quite successful. We will welcome more than 130 atteendees at the new API event. I will do the keynote and two sessions about serverless cloud computing and .NET Web API fundamentals. In this blog post I share slides and samples of my talks.
Keynote: Web API Take Over the Web
In my keynote, I will not focus on technical aspects of Web API. Instead, I speak about why a change towards open APIs, Microservices, Cloud, etc. is necessary. Additionally, I point out organizational consequences that have to be considered when doing the change.
You can find my slides on Speaker Deck:
Serverless Cloud Computing (Azure Functions)
My second session is a technical one. I will talk about serverless web APIs and demo Azure Functions as a practical example.
Slides
You can find my slides on Speaker Deck:
Sample Code
In my session, I will show some samples with Azure Functions. If you want to take my code as a basis for your own experiments, here is it for you to copy:
C# Sample for HTTP Binding
using System.Net;
public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log) {
log.Info("Received Tic-Tac-Toe request");
var board = await req.Content.ReadAsAsync<string[]>();
if (board.Length != 9) {
req.CreateResponse(HttpStatusCode.BadRequest, "No valid tic-tac-toe board");
}
for(var row = 0; row < 3; row ++) {
if (!string.IsNullOrWhiteSpace(board[row * 3])
&& board[row * 3] == board[row * 3 + 1] && board[row * 3] == board[row * 3 + 2]) {
return BuildResponse(req, board[row * 3]);
}
}
for(var column = 0; column < 3; column ++) {
if (!string.IsNullOrWhiteSpace(board[column])
&& board[column] == board[3 + column] && board[column] == board[2 * 3 + column]) {
return BuildResponse(req, board[column]);
}
}
if (!string.IsNullOrWhiteSpace(board[0])
&& board[0] == board[3 + 1] && board[0] == board[2 * 3 + 2]) {
return BuildResponse(req, board[0]);
}
if (!string.IsNullOrWhiteSpace(board[2])
&& board[2] == board[3 + 1] && board[2] == board[2 * 3]) {
return BuildResponse(req, board[1]);
}
return BuildResponse(req);
}
private static HttpResponseMessage BuildResponse(HttpRequestMessage req, string winner = null)=>
req.CreateResponse(HttpStatusCode.OK, (winner == null) ? "No Winner" : $"Winner: {winner}");
Node.js Sample for HTTP and Service Bus Queue Binding
module.exports = function (context, req) {
// Parse request body
var board = JSON.parse(req.body);
// Make sure that body is a properly formed array
if (Array.isArray(board) && board.length == 9) {
// Body is ok -> send message to trigger analysis
context.bindings.outputSbMsg = JSON.stringify({ Message: board });
// Send OK result to caller
context.res = { status: 200 };
context.done();
}
else {
// Body is malformed -> send Bad Request to caller
context.res = { status: 400, body: "No valid tic-tac-toe board" };
context.done();
}
};
C# Sample for Service Bus Queue Binding
#r "Newtonsoft.Json"
using System;
using System.Threading.Tasks;
using Newtonsoft.Json;
public class BoardMessage
{
public string[] Message { get; set; }
}
public static void Run(string boardMsg, TraceWriter log, out string outputSbMsg)
{
log.Info("Received Tic-Tac-Toe request");
var boardContent = JsonConvert.DeserializeObject<BoardMessage>(boardMsg);
var board = boardContent.Message;
if (board == null || board.Length != 9) {
outputSbMsg = "No valid tic-tac-toe board";
return;
}
for(var row = 0; row < 3; row ++) {
if (!string.IsNullOrWhiteSpace(board[row * 3])
&& board[row * 3] == board[row * 3 + 1] && board[row * 3] == board[row * 3 + 2]) {
outputSbMsg = BuildResponse(board[row * 3]);
return;
}
}
[...] // Same logic as above
outputSbMsg = BuildResponse();
}
private static string BuildResponse(string winner = null) =>
(winner == null) ? "No Winner" : $"Winner: {winner}";
Content
