func (f *HostKeyFile) GetHostKeys() (map[string][]gossh.PublicKey, error) {
in, err := os.Open(f.path)
if err != nil {
return nil, err
}
defer in.Close()
hostKeys := make(map[string][]gossh.PublicKey)
n := 0
s := bufio.NewScanner(in)
for s.Scan() {
n++
line := s.Bytes()
hosts, key, err := parseKnownHostsLine(line)
if err != nil {
log.Warningf("%v:%d - %v\n", f.path, n, err)
continue
}
if hosts == "" {
// Comment/empty line
continue
}
// It is permissible to have several lines for the same host name(s)
hostKeys[hosts] = append(hostKeys[hosts], key)
}
return hostKeys, nil
}
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
}
log.V(2).Infof("Got Unit for Job(%s) from registry", jm.Name)
} else {
// Old-style Jobs had "Payloads" instead of Units, also stored separately in the Registry
log.V(2).Infof("Legacy Job(%s) has no PayloadHash - looking for associated Payload", jm.Name)
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)
}
}
j := job.NewJob(jm.Name, *unit)
j.UnitState = r.getUnitState(jm.Name)
j.State = r.determineJobState(jm.Name)
return j
}
func assertJobState(name string, js job.JobState) bool {
j, err := registryCtl.GetJob(name)
if err != nil {
log.Warningf("Error retrieving Job(%s) from Registry: %v", name, err)
return false
}
if j == nil || j.State == nil || *(j.State) != js {
return false
}
msg := fmt.Sprintf("Job %s %s", name, *(j.State))
tgt, err := registryCtl.GetJobTarget(name)
if err != nil {
log.Warningf("Error retrieving target information for Job(%s) from Registry: %v", name, err)
} else if tgt != "" {
if ms, _ := registryCtl.GetMachineState(tgt); ms != nil {
msg = fmt.Sprintf("%s on %s", msg, machineFullLegend(*ms, false))
}
}
fmt.Fprintln(out, msg)
return true
}
// Units enumerates all files recognized as valid systemd units in
// this manager's units directory.
func (m *SystemdUnitManager) Units() (units []string, err error) {
fis, err := ioutil.ReadDir(m.UnitsDir)
if err != nil {
return
}
for _, fi := range fis {
name := fi.Name()
if !unit.RecognizedUnitType(name) {
log.Warningf("Found unrecognized file in %s, ignoring", path.Join(m.UnitsDir, name))
continue
}
units = append(units, name)
}
return
}
// Initialize prepares the Agent for normal operation by doing three things:
// 1. Announce presence to the Registry, tracking the etcd index of the operation
// 2. Discover any jobs that are scheduled locally, loading/starting them if they can run locally
// 3. Cache all unresolved job offers and bid for any that can be run locally
// The returned value is the etcd index at which the agent's presence was announced.
func (a *Agent) Initialize() uint64 {
log.Infof("Initializing Agent")
var idx uint64
wait := time.Second
for {
var err error
if idx, err = a.registry.SetMachineState(a.Machine.State(), a.ttl); err == nil {
log.V(1).Infof("Heartbeat succeeded")
break
}
log.V(1).Infof("Failed heartbeat, retrying in %v", wait)
time.Sleep(wait)
}
// Lock the state early so we can decide what the Agent needs to do
// without the risk of conflicting with any of its other moving parts
a.state.Lock()
defer a.state.Unlock()
machID := a.Machine.State().ID
loaded := map[string]job.Job{}
launched := map[string]job.Job{}
jobs, _ := a.registry.GetAllJobs()
for _, j := range jobs {
tm, _ := a.registry.GetJobTarget(j.Name)
if tm == "" || tm != machID {
continue
}
if !a.ableToRun(&j) {
log.Infof("Unable to run Job(%s), unscheduling", j.Name)
a.registry.ClearJobTarget(j.Name, machID)
continue
}
ts, _ := a.registry.GetJobTargetState(j.Name)
if ts == nil || *ts == job.JobStateInactive {
continue
}
loaded[j.Name] = j
if *ts != job.JobStateLaunched {
continue
}
launched[j.Name] = j
}
units, err := a.um.Units()
if err != nil {
log.Warningf("Failed determining what units are already loaded: %v", err)
}
for _, name := range units {
if _, ok := loaded[name]; !ok {
log.Infof("Unit(%s) should not be loaded here, unloading", name)
a.um.Stop(name)
a.um.Unload(name)
}
}
for _, j := range loaded {
a.state.TrackJob(&j)
a.loadJob(&j)
if _, ok := launched[j.Name]; !ok {
continue
}
a.startJobUnlocked(j.Name)
}
for _, jo := range a.registry.UnresolvedJobOffers() {
// Everything we check against could change over time, so we track
// all offers starting here for future bidding even if we are
// currently unable to bid
a.state.TrackOffer(jo)
a.state.TrackJob(&jo.Job)
}
a.bidForPossibleJobs()
return idx
}
func (el etcdLogger) Warningf(fmt string, args ...interface{}) {
glog.Warningf(fmt, args...)
}