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. 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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