forked from docker/libcompose
/
name.go
81 lines (66 loc) · 1.44 KB
/
name.go
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package docker
import (
"fmt"
"io"
"time"
dockerclient "github.com/fsouza/go-dockerclient"
)
const format = "%s_%s_%d"
// Namer defines method to provide container name.
type Namer interface {
io.Closer
Next() string
}
type inOrderNamer struct {
names chan string
done chan bool
}
type singleNamer struct {
name string
}
// NewSingleNamer returns a namer that only allows a single name.
func NewSingleNamer(name string) Namer {
return &singleNamer{name}
}
// NewNamer returns a namer that returns names based on the specified project and
// service name and an inner counter, e.g. project_service_1, project_service_2…
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 {
close(i.done)
return nil
}
func (s *singleNamer) Next() string {
return s.name
}
func (s *singleNamer) Close() error {
return nil
}