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Use errgroup for running commands in parallel (#83)

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Frederik Ring 2022-03-10 11:09:39 +01:00 committed by GitHub
parent 5f3832d621
commit b8f71b04a1
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3 changed files with 14 additions and 13 deletions
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24
cmd/backup/exec.go
View File

@ -13,12 +13,12 @@ import (
"io/ioutil"
"os"
"strings"
"sync"
"github.com/cosiner/argv"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/pkg/stdcopy"
"golang.org/x/sync/errgroup"
)
func (s *script) exec(containerRef string, command string) ([]byte, []byte, error) {
@ -97,29 +97,27 @@ func (s *script) runLabeledCommands(label string) error {
return nil
}
wg := sync.WaitGroup{}
wg.Add(len(containersWithCommand))
g := new(errgroup.Group)
var cmdErrors []error
for _, container := range containersWithCommand {
go func(c types.Container) {
c := container
g.Go(func() error {
cmd, _ := c.Labels[label]
s.logger.Infof("Running %s command %s for container %s", label, cmd, strings.TrimPrefix(c.Names[0], "/"))
stdout, stderr, err := s.exec(c.ID, cmd)
if err != nil {
cmdErrors = append(cmdErrors, err)
}
if s.c.ExecForwardOutput {
os.Stderr.Write(stderr)
os.Stdout.Write(stdout)
}
wg.Done()
}(container)
if err != nil {
return fmt.Errorf("runLabeledCommands: error executing command: %w", err)
}
return nil
})
}
wg.Wait()
if len(cmdErrors) != 0 {
return join(cmdErrors...)
if err := g.Wait(); err != nil {
return fmt.Errorf("runLabeledCommands: error from errgroup: %w", err)
}
return nil
}

1
go.mod
View File

@ -47,6 +47,7 @@ require (
github.com/pkg/errors v0.9.1 // indirect
github.com/rs/xid v1.3.0 // indirect
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 // indirect
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
golang.org/x/text v0.3.6 // indirect
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect

2
go.sum
View File

@ -806,6 +806,8 @@ golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJ
golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=