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📄 .gitignore # Binaries for programs and plugins .exe .dll .so .dylib # Test binary, build with `go test -c` .test # Output of the go coverage tool, specifically when used with LiteIDE .out # Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736 .glide/	275 B	2025-05-25 12:27
📄 LICENSE Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. 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While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS APPENDIX: How to apply the Apache License to your work. To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright [yyyy] [name of copyright owner] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.	11.09 KB	2025-05-25 12:27
📄 README.md # run [![GoDoc](https://godoc.org/github.com/oklog/run?status.svg)](https://godoc.org/github.com/oklog/run) [![Build Status](https://img.shields.io/endpoint.svg?url=https%3A%2F%2Factions-badge.atrox.dev%2Foklog%2Frun%2Fbadge&style=flat-square&label=build)](https://github.com/oklog/run/actions?query=workflow%3ATest) [![Go Report Card](https://goreportcard.com/badge/github.com/oklog/run)](https://goreportcard.com/report/github.com/oklog/run) [![Apache 2 licensed](https://img.shields.io/badge/license-Apache2-blue.svg)](https://raw.githubusercontent.com/oklog/run/master/LICENSE) run.Group is a universal mechanism to manage goroutine lifecycles. Create a zero-value run.Group, and then add actors to it. Actors are defined as a pair of functions: an execute function, which should run synchronously; and an interrupt function, which, when invoked, should cause the execute function to return. Finally, invoke Run, which concurrently runs all of the actors, waits until the first actor exits, invokes the interrupt functions, and finally returns control to the caller only once all actors have returned. This general-purpose API allows callers to model pretty much any runnable task, and achieve well-defined lifecycle semantics for the group. run.Group was written to manage component lifecycles in func main for [OK Log](https://github.com/oklog/oklog). But it's useful in any circumstance where you need to orchestrate multiple goroutines as a unit whole. [Click here](https://www.youtube.com/watch?v=LHe1Cb_Ud_M&t=15m45s) to see a video of a talk where run.Group is described. ## Examples ### context.Context ```go ctx, cancel := context.WithCancel(context.Background()) g.Add(func() error { return myProcess(ctx, ...) }, func(error) { cancel() }) ``` ### net.Listener ```go ln, _ := net.Listen("tcp", ":8080") g.Add(func() error { return http.Serve(ln, nil) }, func(error) { ln.Close() }) ``` ### io.ReadCloser ```go var conn io.ReadCloser = ... g.Add(func() error { s := bufio.NewScanner(conn) for s.Scan() { println(s.Text()) } return s.Err() }, func(error) { conn.Close() }) ``` ## Comparisons Package run is somewhat similar to package [errgroup](https://godoc.org/golang.org/x/sync/errgroup), except it doesn't require actor goroutines to understand context semantics. It's somewhat similar to package [tomb.v1](https://godoc.org/gopkg.in/tomb.v1) or [tomb.v2](https://godoc.org/gopkg.in/tomb.v2), except it has a much smaller API surface, delegating e.g. staged shutdown of goroutines to the caller.	2.49 KB	2025-05-25 12:27
📄 actors.go package run import ( "context" "fmt" "os" "os/signal" ) // SignalHandler returns an actor, i.e. an execute and interrupt func, that // terminates with SignalError when the process receives one of the provided // signals, or the parent context is canceled. func SignalHandler(ctx context.Context, signals ...os.Signal) (execute func() error, interrupt func(error)) { ctx, cancel := context.WithCancel(ctx) return func() error { c := make(chan os.Signal, 1) signal.Notify(c, signals...) select { case sig := <-c: return SignalError{Signal: sig} case <-ctx.Done(): return ctx.Err() } }, func(error) { cancel() } } // SignalError is returned by the signal handler's execute function // when it terminates due to a received signal. type SignalError struct { Signal os.Signal } // Error implements the error interface. func (e SignalError) Error() string { return fmt.Sprintf("received signal %s", e.Signal) }	949 B	2025-05-25 12:27
📄 example_test.go package run_test import ( "context" "errors" "fmt" "net" "net/http" "time" "github.com/oklog/run" ) func ExampleGroup_Add_basic() { var g run.Group { cancel := make(chan struct{}) g.Add(func() error { select { case <-time.After(time.Second): fmt.Printf("The first actor had its time elapsed\n") return nil case <-cancel: fmt.Printf("The first actor was canceled\n") return nil } }, func(err error) { fmt.Printf("The first actor was interrupted with: %v\n", err) close(cancel) }) } { g.Add(func() error { fmt.Printf("The second actor is returning immediately\n") return errors.New("immediate teardown") }, func(err error) { // Note that this interrupt function is called, even though the // corresponding execute function has already returned. fmt.Printf("The second actor was interrupted with: %v\n", err) }) } fmt.Printf("The group was terminated with: %v\n", g.Run()) // Output: // The second actor is returning immediately // The first actor was interrupted with: immediate teardown // The second actor was interrupted with: immediate teardown // The first actor was canceled // The group was terminated with: immediate teardown } func ExampleGroup_Add_context() { ctx, cancel := context.WithCancel(context.Background()) var g run.Group { ctx, cancel := context.WithCancel(ctx) // note: shadowed g.Add(func() error { return runUntilCanceled(ctx) }, func(error) { cancel() }) } go cancel() fmt.Printf("The group was terminated with: %v\n", g.Run()) // Output: // The group was terminated with: context canceled } func ExampleGroup_Add_listener() { var g run.Group { ln, _ := net.Listen("tcp", ":0") g.Add(func() error { defer fmt.Printf("http.Serve returned\n") return http.Serve(ln, http.NewServeMux()) }, func(error) { ln.Close() }) } { g.Add(func() error { return errors.New("immediate teardown") }, func(error) { // }) } fmt.Printf("The group was terminated with: %v\n", g.Run()) // Output: // http.Serve returned // The group was terminated with: immediate teardown } func runUntilCanceled(ctx context.Context) error { <-ctx.Done() return ctx.Err() }	2.16 KB	2025-05-25 12:27
📄 go.mod module github.com/oklog/run go 1.13	37 B	2025-05-25 12:27
📄 group.go // Package run implements an actor-runner with deterministic teardown. It is // somewhat similar to package errgroup, except it does not require actor // goroutines to understand context semantics. This makes it suitable for use in // more circumstances; for example, goroutines which are handling connections // from net.Listeners, or scanning input from a closable io.Reader. package run // Group collects actors (functions) and runs them concurrently. // When one actor (function) returns, all actors are interrupted. // The zero value of a Group is useful. type Group struct { actors []actor } // Add an actor (function) to the group. Each actor must be pre-emptable by an // interrupt function. That is, if interrupt is invoked, execute should return. // Also, it must be safe to call interrupt even after execute has returned. // // The first actor (function) to return interrupts all running actors. // The error is passed to the interrupt functions, and is returned by Run. func (g Group) Add(execute func() error, interrupt func(error)) { g.actors = append(g.actors, actor{execute, interrupt}) } // Run all actors (functions) concurrently. // When the first actor returns, all others are interrupted. // Run only returns when all actors have exited. // Run returns the error returned by the first exiting actor. func (g Group) Run() error { if len(g.actors) == 0 { return nil } // Run each actor. errors := make(chan error, len(g.actors)) for _, a := range g.actors { go func(a actor) { errors <- a.execute() }(a) } // Wait for the first actor to stop. err := <-errors // Signal all actors to stop. for _, a := range g.actors { a.interrupt(err) } // Wait for all actors to stop. for i := 1; i < cap(errors); i++ { <-errors } // Return the original error. return err } type actor struct { execute func() error interrupt func(error) }	1.84 KB	2025-05-25 12:27
📄 group_test.go package run_test import ( "errors" "testing" "time" "github.com/oklog/run" ) func TestZero(t testing.T) { var g run.Group res := make(chan error) go func() { res <- g.Run() }() select { case err := <-res: if err != nil { t.Errorf("%v", err) } case <-time.After(100 time.Millisecond): t.Error("timeout") } } func TestOne(t testing.T) { myError := errors.New("foobar") var g run.Group g.Add(func() error { return myError }, func(error) {}) res := make(chan error) go func() { res <- g.Run() }() select { case err := <-res: if want, have := myError, err; want != have { t.Errorf("want %v, have %v", want, have) } case <-time.After(100 time.Millisecond): t.Error("timeout") } } func TestMany(t testing.T) { interrupt := errors.New("interrupt") var g run.Group g.Add(func() error { return interrupt }, func(error) {}) cancel := make(chan struct{}) g.Add(func() error { <-cancel; return nil }, func(error) { close(cancel) }) res := make(chan error) go func() { res <- g.Run() }() select { case err := <-res: if want, have := interrupt, err; want != have { t.Errorf("want %v, have %v", want, have) } case <-time.After(100 time.Millisecond): t.Errorf("timeout") } }	1.2 KB	2025-05-25 12:27

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