![]() HTTP keep-alive is on by default in modular AWS SDK for JavaScript In the AWS SDK for JavaScript 2.x Developer Guide.įor more information about using keep-alive, see Reusing Connections with Keep-Alive in Node.js In the AWS SDK for JavaScript 2.x, which is included in the nodejs16.x Lambda runtime, keep-alive is disabled by default. In the AWS SDK for JavaScript 3.x Developer Guide. Reusing connections with keep-alive in Node.js In the AWS SDK for JavaScript 3.x, which is included in nodejs18.x and later Lambda runtimes, keep-alive is enabled by default. You're using, create a Lambda function with the following code. To find the version of the SDK included in the runtime The version of the AWS SDK included in the Node.js runtime depends on the runtime version and your AWS Region. You can also load ES modules from layers. Also, starting with Node.js 18, you can load the AWS SDK that's included in the runtime using ES module import Starting with Node.js 18, Lambda searches folders in the NODE_PATH environment variable when loadingĮS modules. cjs files are always CommonJS modules.įor Node.js runtime versions up to Node.js 16, the Lambda runtime loads ES modules from the same folder as your function handler, You can mix ES modules and CommonJS modules by naming them. js files as ES modules, while in the second scenario, only the file you specify with. In the first approach, your functionĬode treats all. You can do this in two ways: specifying the type as module in the function's Optionally, you can designate yourĬode as an ES module. Designating a function handler as an ES moduleīy default, Lambda treats files with the. See Using Node.js ES modules and top-level await in AWS Lambda. Provisioned concurrency in reducing cold start latency. ![]() Initialization code completes before handler invocations, maximizing the effectiveness of When you await every Promise, the asynchronous Of the file, outside the scope of your function handler. To avoid this, ensure that variables and other asynchronous code are fully initialized before continuing with the rest of the function's core business logic.Īlternatively, you can designate your function code as an ES module, allowing you to use await at the top level These asynchronous tasks are not guaranteed to complete execution prior to an invocation.įor example, code that makes a network call to fetch a parameter from AWS Parameter Store may not be complete by the time Lambda executes the handler function.Īs a result, the variable may be null during an invocation. Some initialization tasks may run asynchronously. Once the network call is completed, its callback is executed and then removed from the callback queue. The function may continue to process other operations within the main call stack without getting blocked by waiting for the network call to return. This model allows Node.js to perform efficiently for most workloads.įor example, if a Node.js function makes a network call, that request may be designated as an asynchronous operation and placed into a callback queue. Specifically, Node.js uses a non-blocking I/O model that supports asynchronous operations. Node.js has a unique event loop model that causes its initialization behavior to be different from other runtimes. Instrumenting Node.js code in AWS Lambda.Deploy Node.js Lambda functions with container images.Your function returns an error, Lambda formats the error and returns it to the It relays any logs that your function outputs during invocation. The function runtime sends details about each invocation toĬloudWatch Logs. Your Lambda function comes with a CloudWatch Logs log group. More information is available from environment variables. The context object contains additional information about the invocation, theįunction, and the execution environment. The function runtime passes a context object to the handler, in addition to the invocation event. The processor function uses the AWS SDK to gather details about the request and stores A CloudWatch Logs subscription invokes a second function This sample includes a private VPC with a VPC endpoint forįunction generates errors for a specified percentage of requests. The function stores a record of eachĮvent in a MySQL for RDS Database in a private VPC. This sample includes a VPC, file system, mount targets, and access pointĮvents from an Amazon Kinesis data stream and update aggregate lists in Amazon DynamoDB. This sample includes a private VPC and database instance configured with aĮfs-nodejs – A function that uses an Amazon EFSįile system in a Amazon VPC. Public API endpoint that processes an event from API Gateway and returns an HTTP response. That shows the use of logging, environment variables, AWS X-Ray tracing, layers, unit tests and the AWS
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