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version.go
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version.go
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package registry
import (
"path"
"strconv"
"github.com/coreos/fleet/Godeps/_workspace/src/github.com/coreos/go-semver/semver"
"github.com/coreos/fleet/etcd"
)
// LatestDaemonVersion attempts to retrieve the latest version of fleetd
// that has been registered in the Registry. It returns the version if
// it can be determined (or nil otherwise), and any error encountered.
func (r *EtcdRegistry) LatestDaemonVersion() (*semver.Version, error) {
machs, err := r.Machines()
if err != nil {
if isKeyNotFound(err) {
err = nil
}
return nil, err
}
var lv *semver.Version
for _, m := range machs {
v, err := semver.NewVersion(m.Version)
if err != nil {
continue
} else if lv == nil || lv.LessThan(*v) {
lv = v
}
}
return lv, nil
}
// EngineVersion implements the ClusterRegistry interface
func (r *EtcdRegistry) EngineVersion() (int, error) {
req := etcd.Get{
Key: r.engineVersionPath(),
}
res, err := r.etcd.Do(&req)
if err != nil {
// no big deal, either the cluster is new or is just
// upgrading from old unversioned code
if isKeyNotFound(err) {
err = nil
}
return 0, err
}
return strconv.Atoi(res.Node.Value)
}
// UpdateEngineVersion implements the ClusterRegistry interface
func (r *EtcdRegistry) UpdateEngineVersion(from, to int) error {
key := r.engineVersionPath()
strTo := strconv.Itoa(to)
strFrom := strconv.Itoa(from)
var req etcd.Action
req = &etcd.Set{
Key: key,
Value: strTo,
PreviousValue: strFrom,
}
_, err := r.etcd.Do(req)
if err == nil {
return nil
} else if !isKeyNotFound(err) {
return err
}
req = &etcd.Create{
Key: key,
Value: strTo,
}
_, err = r.etcd.Do(req)
return err
}
func (r *EtcdRegistry) engineVersionPath() string {
return path.Join(r.keyPrefix, "/engine/version")
}