mirror of
https://github.com/letic/terraform-provider-google.git
synced 2024-07-25 02:56:00 +00:00
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.
74 lines
2.2 KiB
Markdown
74 lines
2.2 KiB
Markdown
# run
|
|
|
|
[](https://godoc.org/github.com/oklog/run)
|
|
[](https://travis-ci.org/oklog/run)
|
|
[](https://goreportcard.com/report/github.com/oklog/run)
|
|
[](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 blocks until the first actor
|
|
returns. 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.
|