/
name.go
73 lines (59 loc) · 1.15 KB
/
name.go
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package docker
import (
"fmt"
"io"
"time"
"github.com/samalba/dockerclient"
)
const format = "%s_%s_%d"
type Namer interface {
io.Closer
Next() string
}
type inOrderNamer struct {
names chan string
done chan bool
}
func OneName(client dockerclient.Client, project, service string) (string, error) {
namer := NewNamer(client, project, service)
defer namer.Close()
return namer.Next(), nil
}
func NewNamer(client dockerclient.Client, project, service string) Namer {
namer := &inOrderNamer{
names: make(chan string),
done: make(chan bool),
}
go func() {
for i := 1; true; i++ {
name := fmt.Sprintf(format, project, service, i)
c, err := GetContainerByName(client, name)
if err != nil {
// Sleep here to avoid crazy tight loop when things go south
time.Sleep(time.Second * 1)
continue
}
if c != nil {
continue
}
select {
case namer.names <- name:
case <-namer.done:
close(namer.names)
return
}
}
}()
return namer
}
func (i *inOrderNamer) Next() string {
return <-i.names
}
func (i *inOrderNamer) Close() error {
select {
case i.done <- true:
close(i.done)
default:
}
return nil
}