- #AWS POSTGRESQL LAMBDA NODEJS HOW TO#
- #AWS POSTGRESQL LAMBDA NODEJS INSTALL#
- #AWS POSTGRESQL LAMBDA NODEJS UPDATE#
- #AWS POSTGRESQL LAMBDA NODEJS CODE#
The capabilities are near endless with these powerful services from Amazon Web Services. I hope this post gave you the basics needed to create your first (or perhaps a better) serverless API using Lambda and API Gateway. This is helpful so that you don’t accidentally deploy to the “pord” instead of “prod” stage. I’ve also configured the sample project to use the serverless-stage-manager which allows you to configure a list of allowable stages. Middleware allows you to return the correct CORS headers by simply setting the headers directly or using the res.cors() convenience method: CORS is nothing more than setting the correct headers when responding to a request from a web browser. API Gateway has a built-in CORS implementation, but it is a static implementation and requires extra configuration. If you are writing an API that will be accessed directly from a web browser, then you’ll need to implement Cross-Origin Resource Sharing (CORS).
When we are done processing, we call the next() function to move on. The REQUEST object is writable, so setting req.auth=true will allow other middleware and routes to access that value. We may look this up in a database or cache and then flag the request as authorized, or throw an error. If this is a “Bearer” token authorization, we can grab the token value using and then do something with that to confirm that the request is authorized. Lambda API will automatically parse several types of authorization schemas and normalize them for you. Notice that we check the req.auth parameter. If we wanted to perform authorization before every request, we could use: When called, the next function tells the middleware to move on to the next middleware or to the route if there are no more defined. This function takes three arguments, the REQUEST and RESPONSE objects and a next function. use() method and takes a function as its single argument. This is useful for things like authentication or CORS. Middleware allows you to process the request BEFORE it goes to a specific route. If you post FORM variables, Lambda API will parse and decode them as long as you send in a Content-Type: "application/x-Middleware If it can’t be parsed, it will just include the raw string. If you post JSON, the module will attempt to parse it into a Javascript object. Lambda API handles this for you automatically regardless of what you send in the body. Most POST and PUT routes will expect some kind of BODY input. The part of the path is API Gateway’s all-encompassing proxy resource that routes any path, no matter how deep, to the specified resource. Finally it attaches an http event that responds to any HTTP method that matches a path that starts with v1/. It has a handler, which specifies which module and which function to route requests to. As shown below, this creates a function called serverless-api and names it using the service name and then deployment stage (more on that later). The functions section is another important piece. All it does is allow logs to be created and for an S3 bucket to be created to store your deployments. The iamRoleStatements section creates a new role for your Lambda function. There are a few more parts of the serverless.yml file that you should know about.
#AWS POSTGRESQL LAMBDA NODEJS UPDATE#
Once your profile is configured, update the with your profile name. If you don’t have a local AWS profile set up, you can configure one using this: If you only have one account, then it is probably named default. This refers to the name of your local AWS profile. On line 8 there is a property named profile. I suggest you do that when you get a chance as this is a very powerful tool.įor now, we just need to configure one thing to get started. You can learn more about this file and its options here. Now we’re ready to start working on our API.
#AWS POSTGRESQL LAMBDA NODEJS INSTALL#
Let’s get started.įirst we need to install the Serverless framework, using our Terminal:Īnd that’s it. We’ll create some sample routes, handle CORS, and discuss managing authentication.
#AWS POSTGRESQL LAMBDA NODEJS HOW TO#
In this post I’m going to show you how to setup and deploy a serverless API using the Serverless framework and Lambda API, a lightweight web framework for your serverless applications using AWS Lambda and API Gateway.
#AWS POSTGRESQL LAMBDA NODEJS CODE#
Even structuring your application code and dependencies can be difficult to wrap your head around when working with multiple functions. Managing deployments and resources can be tricky, especially when publishing to multiple stages (e.g. There are, for example, lots of confusing and conflicting configurations in API Gateway. While this all seems pretty straightforward on the surface, there are plenty of pitfalls that can make working with these services frustrating. Developers can simply create Lambda functions, configure an API Gateway, and start responding to RESTful endpoint calls. AWS Lambda and AWS API Gateway have made creating serverless APIs extremely easy.
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