How Can I Handle Errors in Goroutines When Using Channels?

Passing Errors in Goroutines Using Channels

In Go, functions typically return a value and an optional error, as demonstrated in the provided createHashedPassword function. When executing this function in a goroutine, a common approach is to communicate the results through a channel. However, handling errors within this setup requires special consideration.

To effectively handle errors in goroutines, it's recommended to encapsulate the output values, including potential errors, into a custom struct. By passing this struct over a single channel, you can return both the result and any associated errors effortlessly.

For example, you could create a Result struct with two fields: Message for the expected output and Error for any encountered errors:

type Result struct {
    Message string
    Error error
}

Next, initialize a channel specifically for transmitting Result structs:

ch := make(chan Result)

Now, within your goroutine, execute the createHashedPassword function and assign the result to a Result variable:

go func() {
    result := Result{
        Message: createHashedPassword(),
        Error: err, // Any potential error encountered during execution
    }
    ch <- result
}()

On the receiving end, you can retrieve the result and check for any errors:

select {
case result := <-ch:
    if result.Error != nil {
        // Handle the error
    }
    // Do something with result.Message
}

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