How to Handle Specific Errors in Go?

Handling Specific Errors in Go

In Go, error handling is crucial for managing unexpected situations. When working with standard library functions, it's often necessary to catch specific errors to perform tailored actions.

Using errors.Is and errors.As Functions

For errors wrapped using errors.Is and errors.As functions, you can directly check the specific error:

client, err := rpc.Dial("tcp", ":1234")  
if errors.Is(err, syscall.ECONNREFUSED) {
  // Connection refused error
}

Fallback: String Comparison of Error Strings

For errors not wrapped with errors.Is and errors.As, you can resort to comparing the error string:

if err.Error() == "connection lost" { ... }

Type-Based Error Checking

In cases where the library provides specific error types, you can check the error's type:

if _, ok := err.(net.Error); ok {
    // Network error handling logic
}

Retrieving Standard Library Errors

To obtain a list of errors a standard library function may return, you can refer to the library's documentation. The godoc website provides detailed information on error types. Additionally, examining the source code can give you an exhaustive list of errors.

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