The errgroup.Group type provides synchronization, error propagation, and Context cancelation for groups of goroutines
working on sub-tasks of a common task.
Usage of Group
g, ctx := errgroup.WithContext(context.Background())
g.Go(func() error {
// Your code here
return nil // return an error if something goes wrong
})
// Wait for all goroutines to finish and collect any errors
err := g.Wait()
Use Cases
Concurrent Error Handling: Executing multiple goroutines and aggregating their errors.
Context Propagation: Propagating context and cancellation signals across a group of goroutines.
Common Pitfalls
Error Ignorance: Ignoring errors returned by Group.Go.
Misusing Context: Misusing the context returned by errgroup.WithContext can lead to unintended behavior. For
instance, storing values in the context that are supposed to be accessed by goroutines may lead to race conditions if
not handled properly.
Best Practices
Error Handling: Always handle errors returned by Group.Go.
Context Usage: Use the context returned by errgroup.WithContext to propagate cancelation.