How to handle errors gracefully and ensure module reusability in an asynchronous workflow?

Elegantly handle asynchronous workflow errors and improve module reusability

Efficient error handling and module reuse are crucial when building complex asynchronous workflows. This article explores how to handle errors gracefully in asynchronous operations while ensuring independence and reusability of individual steps in the process.

Suppose a table presentation workflow consists of two asynchronous steps: obtaining the header information (step1) and obtaining and rendering the table data (step2). Both steps return the Promise object. The key is how to handle the errors in these two steps and handle them uniformly in the main process function, while allowing step2 to be called independently.

Simple try...catch and throwing the original error directly loses context information (e.g. which step goes wrong). A better approach would be to customize the error class, such as StepError , which contains the error steps and the original error message.

Improved method: In step1 and step2 , catch block throws a StepError object instead of the original error. try...catch block of the main process function (such as process ) performs specific processing based on the type and information of StepError , such as logging or displaying user-friendly error prompts.

While handling errors in process function uniformly, this method also allows independent call to step2 function and provides more detailed error context for easy debugging. For example, a query function can directly call step2 without handling errors inside step2 , because step2 itself already has an error handling mechanism. If step2 errors, its internal catch block will be processed and will not affect the execution of query function. This perfectly balances error handling and module multiplexing.

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