Скачать или смотреть Fixing the Repeated Input from Stdin Issue in Go

Learn how to create a Go program that echoes input from stdin repeatedly for 10 seconds without exiting prematurely.
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This video is based on the question https://stackoverflow.com/q/76989912/ asked by the user 'user219820' ( https://stackoverflow.com/u/13815871/ ) and on the answer https://stackoverflow.com/a/76989934/ provided by the user 'Pel' ( https://stackoverflow.com/u/20117010/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Repeated Input from Stdin Issue in Go

If you're working with Go and trying to create a program that echoes text inputted through stdin until a timeout of 10 seconds, you may have run into a common issue where the program exits after only the first line of input. Let's explore this problem and provide a comprehensive solution.

Understanding the Problem

Here's the scenario:

You have a Go program that reads input from stdin.

It is supposed to echo whatever is typed back to the user for a duration of 10 seconds.

After the initial input, the program unexpectedly exits instead of allowing more commands.

The initial implementation may look something like this:

[[See Video to Reveal this Text or Code Snippet]]

The Issue Explained

In the above code, the problem arises because the select statement directly exits upon receiving a signal from the abort channel after 10 seconds, which cuts off any further input. This is because the select is only waiting for one case to be satisfied at a time.

The Solution

Adjusting the Loop and Channel Closure

The solution involves making a few key adjustments to ensure that your program can continue to accept input until the timeout occurs. Here's a revised version of the program:

[[See Video to Reveal this Text or Code Snippet]]

Key Changes Made

Closed the Abort Channel: By changing abort <- true to close(abort), the channel can now signal that it has reached the timeout effectively.

Infinite Loop for Input Handling: Instead of using a single select, an infinite loop (for { ... }) is used to continuously wait for either a command input or an abort signal.

Clean Handling of Input and Abort: The program now continuously listens for input and only stops when the abort channel is closed.

Conclusion

With these modifications, your Go program will now be able to accept as many commands as you want for 10 seconds, providing a more interactive experience.

Feel free to use this structure in your projects, and enjoy building your Go applications!