https://github.com/k1low/concgroup

concgroup provides almost the same features to goroutine groups as golang.org/x/sync/errgroup but ensures sequential run of goroutines with the same group key.
https://github.com/k1low/concgroup

concurrency errgroup go

Last synced: 4 months ago
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concgroup provides almost the same features to goroutine groups as golang.org/x/sync/errgroup but ensures sequential run of goroutines with the same group key.

• Host: GitHub
• URL: https://github.com/k1low/concgroup
• Owner: k1LoW
• License: mit
• Created: 2023-03-10T14:23:22.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2025-07-14T00:37:55.000Z (11 months ago)
• Last Synced: 2025-07-14T02:54:01.638Z (11 months ago)
• Topics: concurrency, errgroup, go
• Language: Go
• Homepage:
• Size: 25.4 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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# concgroup

[![Go Reference](https://pkg.go.dev/badge/github.com/k1LoW/concgroup.svg)](https://pkg.go.dev/github.com/k1LoW/concgroup) [![CI](https://github.com/k1LoW/concgroup/actions/workflows/ci.yml/badge.svg)](https://github.com/k1LoW/concgroup/actions/workflows/ci.yml) ![Coverage](https://raw.githubusercontent.com/k1LoW/octocovs/main/badges/k1LoW/concgroup/coverage.svg) ![Code to Test Ratio](https://raw.githubusercontent.com/k1LoW/octocovs/main/badges/k1LoW/concgroup/ratio.svg) ![Test Execution Time](https://raw.githubusercontent.com/k1LoW/octocovs/main/badges/k1LoW/concgroup/time.svg)

`concgroup` provides almost the same features to goroutine groups as `golang.org/x/sync/errgroup` but ensures sequential run of goroutines with the same group key.

## Usage

``` go

package main

import (

	"fmt"

	"net/http"

	"time"

	"github.com/k1LoW/concgroup"

)

func main() {

	cg := new(concgroup.Group)

	var urlgroups = map[string][]string{

		"go": {

			"https://go.dev/",

			"https://go.dev/dl/",

		},

		"google": {

			"http://www.google.com/",

		},

	}

	for key, ug := range urlgroups {

		for _, url := range ug {

			url := url // https://golang.org/doc/faq#closures_and_goroutines

			cg.Go(key, func() error {

				// Fetch URL sequentially by key

				resp, err := http.Get(url)

				if err == nil {

					resp.Body.Close()

				}

				return err

			})

		}

	}

	// Wait for all HTTP fetches to complete.

	if err := cg.Wait(); err == nil {

		fmt.Println("Successfully fetched all URLs.")

	}

}

```