How to Catch Specific Errors in Go?

Catching Specific Errors in Go

Introduction

Error handling is a crucial aspect of software development, and in Go, there exists a need to differentiate between various types of errors. This article will guide you through the techniques to catch specific errors, particularly those related to "connection lost" or "connection refused."

Matching Error Types Using errors.Is and errors.As**

The Go standard library provides powerful functions, errors.Is and errors.As, which enable you to compare errors based on their types. For instance:

Fallback to Error Message Comparison

If the error type is not accessible or does not provide a suitable comparison method, you can resort to comparing the error message as a string. However, this approach is less reliable and more prone to breakage.

Checking Specific Library Errors

When working with Go standard libraries, you can consult the documentation to identify the specific error types that may be returned. For instance, the net package defines the net.Error type for network-related errors. You can check the error against this type and then further verify the error message if necessary:

Retrieving All Possible Errors

To obtain a comprehensive list of possible errors returned by a specific standard library function, the most reliable method is to inspect the source code. Alternatively, you can refer to the documentation of the library.

Conclusion

Catching specific errors in Go can be achieved using errors.Is and errors.As for error type comparison, or by comparing error messages when necessary. Consulting the documentation of standard libraries is essential for understanding the types of errors that may occur. These techniques empower you to handle errors more precisely and ensure the stability of your application.

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