mirror of
https://github.com/letic/terraform-provider-google.git
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961c878e0d
Switch to using Go modules. This migrates our vendor.json to use Go 1.11's modules system, and replaces the vendor folder with the output of go mod vendor. The vendored code should remain basically the same; I believe some tree shaking of packages and support scripts/licenses/READMEs/etc. happened. This also fixes Travis and our Makefile to no longer use govendor.
63 lines
1.8 KiB
Go
63 lines
1.8 KiB
Go
// Package run implements an actor-runner with deterministic teardown. It is
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// somewhat similar to package errgroup, except it does not require actor
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// goroutines to understand context semantics. This makes it suitable for use in
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// more circumstances; for example, goroutines which are handling connections
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// from net.Listeners, or scanning input from a closable io.Reader.
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package run
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// Group collects actors (functions) and runs them concurrently.
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// When one actor (function) returns, all actors are interrupted.
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// The zero value of a Group is useful.
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type Group struct {
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actors []actor
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}
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// Add an actor (function) to the group. Each actor must be pre-emptable by an
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// interrupt function. That is, if interrupt is invoked, execute should return.
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// Also, it must be safe to call interrupt even after execute has returned.
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//
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// The first actor (function) to return interrupts all running actors.
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// The error is passed to the interrupt functions, and is returned by Run.
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func (g *Group) Add(execute func() error, interrupt func(error)) {
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g.actors = append(g.actors, actor{execute, interrupt})
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}
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// Run all actors (functions) concurrently.
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// When the first actor returns, all others are interrupted.
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// Run only returns when all actors have exited.
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// Run returns the error returned by the first exiting actor.
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func (g *Group) Run() error {
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if len(g.actors) == 0 {
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return nil
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}
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// Run each actor.
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errors := make(chan error, len(g.actors))
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for _, a := range g.actors {
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go func(a actor) {
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errors <- a.execute()
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}(a)
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}
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// Wait for the first actor to stop.
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err := <-errors
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// Signal all actors to stop.
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for _, a := range g.actors {
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a.interrupt(err)
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}
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// Wait for all actors to stop.
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for i := 1; i < cap(errors); i++ {
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<-errors
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}
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// Return the original error.
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return err
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}
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type actor struct {
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execute func() error
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interrupt func(error)
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}
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