func (r *EtcdRegistry) getJobFromModel(jm jobModel) *job.Job {
var err error
var unit *unit.Unit
// New-style Jobs should have a populated UnitHash, and the contents of the Unit are stored separately in the Registry
if !jm.UnitHash.Empty() {
unit = r.getUnitByHash(jm.UnitHash)
if unit == nil {
log.Warningf("No Unit found in Registry for Job(%s)", jm.Name)
return nil
}
if unit.Hash() != jm.UnitHash {
log.Errorf("Unit Hash %s does not match expected %s for Job(%s)!", unit.Hash(), jm.UnitHash, jm.Name)
return nil
}
} else {
// Old-style Jobs had "Payloads" instead of Units, also stored separately in the Registry
unit, err = r.getUnitFromLegacyPayload(jm.Name)
if err != nil {
log.Errorf("Error retrieving legacy payload for Job(%s)", jm.Name)
return nil
} else if unit == nil {
log.Warningf("No Payload found in Registry for Job(%s)", jm.Name)
return nil
}
log.Infof("Migrating legacy Payload(%s)", jm.Name)
if err := r.storeOrGetUnit(*unit); err != nil {
log.Warningf("Unable to migrate legacy Payload: %v", err)
}
}
return job.NewJob(jm.Name, *unit)
}
// Load writes the given Unit to disk, subscribing to relevant dbus
// events, caching the Unit's Hash, and, if necessary, instructing the systemd
// daemon to reload.
func (m *systemdUnitManager) Load(name string, u unit.Unit) error {
m.mutex.Lock()
defer m.mutex.Unlock()
err := m.writeUnit(name, u.String())
if err != nil {
return err
}
m.hashes[name] = u.Hash()
return m.daemonReload()
}
func (ur *unitsResource) destroy(rw http.ResponseWriter, req *http.Request, item string) {
if validateContentType(req) != nil {
sendError(rw, http.StatusNotAcceptable, errors.New("application/json is only supported Content-Type"))
return
}
var du schema.DeletableUnit
dec := json.NewDecoder(req.Body)
err := dec.Decode(&du)
if err != nil {
sendError(rw, http.StatusBadRequest, fmt.Errorf("unable to decode body: %v", err))
return
}
var u *unit.Unit
if len(du.FileContents) > 0 {
u, err = decodeUnitContents(du.FileContents)
if err != nil {
sendError(rw, http.StatusBadRequest, fmt.Errorf("invalid fileContents: %v", err))
return
}
}
j, err := ur.reg.Job(item)
if err != nil {
log.Errorf("Failed fetching Job(%s): %v", item, err)
sendError(rw, http.StatusInternalServerError, nil)
return
}
if j == nil {
sendError(rw, http.StatusNotFound, errors.New("unit does not exist"))
return
}
if u != nil && u.Hash() != j.Unit.Hash() {
sendError(rw, http.StatusConflict, errors.New("hash of provided fileContents does not match that of existing unit"))
return
}
err = ur.reg.DestroyJob(item)
if err != nil {
log.Errorf("Failed destroying Job(%s): %v", item, err)
sendError(rw, http.StatusInternalServerError, nil)
return
}
rw.WriteHeader(http.StatusNoContent)
}
func (ur *unitsResource) update(rw http.ResponseWriter, j *job.Job, ds job.JobState, cmp *unit.Unit) {
// Assert that the Job's Unit matches the Unit in the request, if provided
if cmp != nil && cmp.Hash() != j.Unit.Hash() {
sendError(rw, http.StatusConflict, errors.New("hash of provided fileContents does not match that of existing unit"))
return
}
err := ur.reg.SetJobTargetState(j.Name, ds)
if err != nil {
log.Errorf("Failed setting target state of Job(%s): %v", j.Name, err)
sendError(rw, http.StatusInternalServerError, nil)
return
}
rw.WriteHeader(http.StatusNoContent)
}
func (r *EtcdRegistry) getJobFromObjectNode(node *etcd.Node) (*job.Job, error) {
var err error
var jm jobModel
if err = unmarshal(node.Value, &jm); err != nil {
return nil, err
}
var unit *unit.Unit
// New-style Jobs should have a populated UnitHash, and the contents of the Unit are stored separately in the Registry
if !jm.UnitHash.Empty() {
unit = r.getUnitByHash(jm.UnitHash)
if unit == nil {
log.Warningf("No Unit found in Registry for Job(%s)", jm.Name)
return nil, nil
}
if unit.Hash() != jm.UnitHash {
log.Errorf("Unit Hash %s does not match expected %s for Job(%s)!", unit.Hash(), jm.UnitHash, jm.Name)
return nil, nil
}
} else {
// Old-style Jobs had "Payloads" instead of Units, also stored separately in the Registry
unit, err = r.getUnitFromLegacyPayload(jm.Name)
if err != nil {
log.Errorf("Error retrieving legacy payload for Job(%s)", jm.Name)
return nil, nil
} else if unit == nil {
log.Warningf("No Payload found in Registry for Job(%s)", jm.Name)
return nil, nil
}
log.Infof("Migrating legacy Payload(%s)", jm.Name)
if err := r.storeOrGetUnit(*unit); err != nil {
log.Warningf("Unable to migrate legacy Payload: %v", err)
}
jm.UnitHash = unit.Hash()
log.Infof("Updating Job(%s) with legacy payload Hash(%s)", jm.Name, jm.UnitHash)
if err := r.updateJobObjectNode(&jm, node.ModifiedIndex); err != nil {
log.Warningf("Unable to update Job(%s) with legacy payload Hash(%s): %v", jm.Name, jm.UnitHash, err)
}
}
return job.NewJob(jm.Name, *unit), nil
}
// NewJob creates a new Job based on the given name and Unit.
// The returned Job has a populated UnitHash and empty JobState and
// UnitState. nil is returned on failure.
func NewJob(name string, unit unit.Unit) *Job {
return &Job{
Name: name,
State: nil,
Unit: unit,
UnitHash: unit.Hash(),
UnitState: nil,
}
}
func (r *EtcdRegistry) storeOrGetUnit(u unit.Unit) (err error) {
json, err := marshal(u)
if err != nil {
return err
}
req := etcd.Create{
Key: r.hashedUnitPath(u.Hash()),
Value: json,
}
_, err = r.etcd.Do(&req)
// unit is already stored
if err != nil && isNodeExist(err) {
// TODO(jonboulle): verify more here?
err = nil
}
return
}
func (r *EtcdRegistry) storeOrGetUnit(u unit.Unit) (err error) {
key := r.hashedUnitPath(u.Hash())
json, err := marshal(u)
if err != nil {
return err
}
log.V(3).Infof("Storing Unit(%s) in Registry: %s", u.Hash(), json)
_, err = r.etcd.Create(key, json, 0)
// unit is already stored
if err != nil && err.(*goetcd.EtcdError).ErrorCode == etcd.EcodeNodeExist {
log.V(2).Infof("Unit(%s) already exists in Registry", u.Hash())
// TODO(jonboulle): verify more here?
err = nil
}
return
}