TechDays 2017 - Creating real life serverless solutions with azure functions
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The document outlines a serverless architecture using Azure functions and CosmosDB to create a URL minification service, illustrating how to handle HTTP requests for creating and retrieving minified URLs. It details the use of bindings for data interactions and provides code snippets for implementing GET and POST requests with error handling. Additionally, it emphasizes efficient instance startups and the importance of adhering to existing development patterns and principles.
!["bindings": [
{
"type": "httpTrigger",
"route": "{slug}",
"methods": [
"get"
],
"authLevel": "anonymous",
"name": "req"
}
],
Function, User, System & Admin](https://image.slidesharecdn.com/creatingreallifeserverlesssolutionswithazurefunctions-public-171016115834/85/TechDays-2017-Creating-real-life-serverless-solutions-with-azure-functions-21-320.jpg)
!["bindings": [
{
"name": “minifiedUrl",
"type": "documentDB",
"databaseName": “MinifyRepository",
"collectionName": “MinifiedUrls",
"createIfNotExists": true,
"connection": “CosmosDbConnection",
"direction": "out"
}
],](https://image.slidesharecdn.com/creatingreallifeserverlesssolutionswithazurefunctions-public-171016115834/85/TechDays-2017-Creating-real-life-serverless-solutions-with-azure-functions-22-320.jpg)
![[FunctionName("Get")]
public static async Task<HttpResponseMessage> Run(
[HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "{slug}")]
HttpRequestMessage req,
string slug,
TraceWriter log)
{
var getUrl = new GetUrlHandler();
var minifiedUrl = await getUrl.Execute(slug);
if (minifiedUrl == null)
{
return req.CreateErrorResponse(HttpStatusCode.NotFound,
$"Minified value `{slug}` is not found.");
}
var response = req.CreateResponse(HttpStatusCode.Redirect);
response.Headers.Location = new Uri(minifiedUrl.FullUrl);
return response;
}](https://image.slidesharecdn.com/creatingreallifeserverlesssolutionswithazurefunctions-public-171016115834/85/TechDays-2017-Creating-real-life-serverless-solutions-with-azure-functions-32-320.jpg)
![public static class Create
{
[FunctionName("Create")]
public static HttpResponseMessage Run(
[HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = "create")]
HttpRequestMessage req,
[DocumentDB("datbaseName", "collectionName",
PartitionKey = "MinifiedUrls",
CreateIfNotExists = true,
ConnectionStringSetting = "minifiedUrlConnectionString")]
out dynamic minifiedUrl,
TraceWriter log)
{
string jsonContent = req.Content.ReadAsStringAsync().Result;
var data = JsonConvert.DeserializeObject<MinifiedUrl>(jsonContent);
var create = new CreateUrlHandler();
minifiedUrl = create.Execute(data);
return req.CreateResponse(HttpStatusCode.Created,
$"api/{data.MinifiedSlug}");
}
}](https://image.slidesharecdn.com/creatingreallifeserverlesssolutionswithazurefunctions-public-171016115834/85/TechDays-2017-Creating-real-life-serverless-solutions-with-azure-functions-33-320.jpg)
![{
"$schema": "http://json.schemastore.org/proxies",
"proxies": {
"getminifiedredirect": {
"matchCondition": {
"methods": [ "GET" ],
"route": "/{slug}"
},
"backendUri": "https://%WEBSITE_HOSTNAME%/api/{slug}"
}
}
}
Matching conditions](https://image.slidesharecdn.com/creatingreallifeserverlesssolutionswithazurefunctions-public-171016115834/85/TechDays-2017-Creating-real-life-serverless-solutions-with-azure-functions-47-320.jpg)
TechDays 2017 - Creating real life serverless solutions with azure functions
- 4. servers
- 5. Like PaaS
- 6. “If your PaaS can efficiently start instances in 20ms that run for half a second, then call it serverless.” Adrian Cockcroft - VP Cloud Architecture Strategy AWS
- 7. Keep It Small and Simple
- 10. GET minified URL redirect CREATE minified URL
- 11. CosmosDB
- 12. Oh yeah!
- 14. Web App CosmosDB
- 20. Bindings are your friend
- 21. "bindings": [ { "type": "httpTrigger", "route": "{slug}", "methods": [ "get" ], "authLevel": "anonymous", "name": "req" } ], Function, User, System & Admin
- 22. "bindings": [ { "name": “minifiedUrl", "type": "documentDB", "databaseName": “MinifyRepository", "collectionName": “MinifiedUrls", "createIfNotExists": true, "connection": “CosmosDbConnection", "direction": "out" } ],
- 23. Don’t write JSON
- 25. Where to put the code
- 26. Existing patterns & principles still apply!
- 27. private readonly ICosmosClient cosmosClient; public CreateUrlHandler() { this.cosmosClient = new CosmosClient(); } public CreateUrlHandler(ICosmosClient cosmosClient) { this.cosmosClient = cosmosClient; }
- 32. [FunctionName("Get")] public static async Task<HttpResponseMessage> Run( [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "{slug}")] HttpRequestMessage req, string slug, TraceWriter log) { var getUrl = new GetUrlHandler(); var minifiedUrl = await getUrl.Execute(slug); if (minifiedUrl == null) { return req.CreateErrorResponse(HttpStatusCode.NotFound, $"Minified value `{slug}` is not found."); } var response = req.CreateResponse(HttpStatusCode.Redirect); response.Headers.Location = new Uri(minifiedUrl.FullUrl); return response; }
- 33. public static class Create { [FunctionName("Create")] public static HttpResponseMessage Run( [HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = "create")] HttpRequestMessage req, [DocumentDB("datbaseName", "collectionName", PartitionKey = "MinifiedUrls", CreateIfNotExists = true, ConnectionStringSetting = "minifiedUrlConnectionString")] out dynamic minifiedUrl, TraceWriter log) { string jsonContent = req.Content.ReadAsStringAsync().Result; var data = JsonConvert.DeserializeObject<MinifiedUrl>(jsonContent); var create = new CreateUrlHandler(); minifiedUrl = create.Execute(data); return req.CreateResponse(HttpStatusCode.Created, $"api/{data.MinifiedSlug}"); } }
- 35. Easy mode
- 39. Pro mode
- 42. Check if you use slots Point to the correct package
- 46. https://my.jdv.li/api/minifiedurl or https://my.jdv.li/minifiedurl
- 47. { "$schema": "http://json.schemastore.org/proxies", "proxies": { "getminifiedredirect": { "matchCondition": { "methods": [ "GET" ], "route": "/{slug}" }, "backendUri": "https://%WEBSITE_HOSTNAME%/api/{slug}" } } } Matching conditions