func TestCreateFailsIfCantAcquireLock(t *testing.T) {
newRCID := rc_fields.ID("new_rc")
oldRCID := rc_fields.ID("old_rc")
rollstore := newRollStore(t, nil)
update := fields.Update{
NewRC: newRCID,
OldRC: oldRCID,
}
// Grab an update creation lock on one of the RCs and make sure the
// creation fails
session, _, err := rollstore.store.NewSession("conflicting session", nil)
if err != nil {
t.Fatalf("Unable to create session for conflicting lock: %s", err)
}
defer session.Destroy()
_, err = rollstore.rcstore.LockForUpdateCreation(update.OldRC, session)
if err != nil {
t.Fatalf("Unable to acquire conflicting lock on old rc: %s", err)
}
_, err = rollstore.CreateRollingUpdateFromExistingRCs(update, nil, nil)
if err == nil {
t.Fatal("Expected update creation to fail due to lock conflict")
}
ru, _ := rollstore.Get(fields.ID(newRCID))
if ru.NewRC != "" || ru.OldRC != "" {
t.Fatal("New ru shouldn't have been created but it was")
}
}
func createHelloReplicationController(dir string) (fields.ID, error) {
signedManifestPath, err := writeHelloManifest(dir, "hello.yaml", 43770)
if err != nil {
return "", err
}
cmd := exec.Command("p2-rctl", "--log-json", "create", "--manifest", signedManifestPath, "--node-selector", "test=yes")
out := bytes.Buffer{}
cmd.Stdout = &out
cmd.Stderr = &out
err = cmd.Run()
if err != nil {
return fields.ID(""), fmt.Errorf("Couldn't create replication controller for hello: %s %s", out.String(), err)
}
var rctlOut struct {
ID string `json:"id"`
}
err = json.Unmarshal(out.Bytes(), &rctlOut)
if err != nil {
return fields.ID(""), fmt.Errorf("Couldn't read RC ID out of p2-rctl invocation result: %v", err)
}
output, err := exec.Command("p2-rctl", "set-replicas", rctlOut.ID, "1").CombinedOutput()
if err != nil {
fmt.Println(string(output))
return "", err
}
return fields.ID(rctlOut.ID), nil
}
// Given a consul key path, returns the RC ID and the lock type. Returns an err
// if the key does not resemble an RC lock key
func (s *consulStore) lockTypeFromKey(key string) (fields.ID, LockType, error) {
keyParts := strings.Split(key, "/")
// Sanity check key structure e.g. /lock/replication_controllers/abcd-1234
if len(keyParts) < 3 || len(keyParts) > 4 {
return "", UnknownLockType, util.Errorf("Key '%s' does not resemble an RC lock", key)
}
if keyParts[0] != consulutil.LOCK_TREE {
return "", UnknownLockType, util.Errorf("Key '%s' does not resemble an RC lock", key)
}
if keyParts[1] != rcTree {
return "", UnknownLockType, util.Errorf("Key '%s' does not resemble an RC lock", key)
}
rcID := keyParts[2]
if len(keyParts) == 3 {
// There's no lock suffix, so this is an ownership lock
return fields.ID(rcID), OwnershipLockType, nil
}
switch keyParts[3] {
case mutationSuffix:
return fields.ID(rcID), MutationLockType, nil
case updateCreationSuffix:
return fields.ID(rcID), UpdateCreationLockType, nil
default:
return fields.ID(rcID), UnknownLockType, nil
}
}
func TestWouldWorkOn(t *testing.T) {
fakeLabels := labels.NewFakeApplicator()
fakeLabels.SetLabel(labels.RC, "abc-123", "color", "red")
fakeLabels.SetLabel(labels.RC, "def-456", "color", "blue")
f := &Farm{
labeler: fakeLabels,
rcSelector: klabels.Everything().Add("color", klabels.EqualsOperator, []string{"red"}),
}
workOn, err := f.shouldWorkOn(rc_fields.ID("abc-123"))
Assert(t).IsNil(err, "should not have erred on abc-123")
Assert(t).IsTrue(workOn, "should have worked on abc-123, but didn't")
dontWorkOn, err := f.shouldWorkOn(rc_fields.ID("def-456"))
Assert(t).IsNil(err, "should not have erred on def-456")
Assert(t).IsFalse(dontWorkOn, "should not have worked on def-456, but did")
dontWorkOn, err = f.shouldWorkOn(rc_fields.ID("987-cba"))
Assert(t).IsNil(err, "should not have erred on 987-cba")
Assert(t).IsFalse(dontWorkOn, "should not have worked on 987-cba, but did")
f.rcSelector = klabels.Everything()
workOn, err = f.shouldWorkOn(rc_fields.ID("def-456"))
Assert(t).IsNil(err, "should not have erred on def-456")
Assert(t).IsTrue(workOn, "should have worked on def-456, but didn't")
}
func (r RCtl) RollingUpdate(oldID, newID string, want, need int, deletes bool) {
if want < need {
r.logger.WithFields(logrus.Fields{
"want": want,
"need": need,
}).Fatalln("Cannot run update with desired replicas less than minimum replicas")
}
sessions := make(chan string)
quit := make(chan struct{})
go kp.ConsulSessionManager(api.SessionEntry{
LockDelay: 1 * time.Nanosecond,
Behavior: api.SessionBehaviorDelete,
TTL: "15s",
}, r.baseClient, sessions, quit, r.logger)
session := <-sessions
if session == "" {
r.logger.NoFields().Fatalln("Could not acquire session")
}
lock := r.kps.NewUnmanagedLock(session, "")
result := make(chan bool, 1)
go func() {
result <- roll.NewUpdate(roll_fields.Update{
OldRC: rc_fields.ID(oldID),
NewRC: rc_fields.ID(newID),
DesiredReplicas: want,
MinimumReplicas: need,
DeletePods: deletes,
}, r.kps, r.rcs, r.hcheck, r.labeler, r.sched, r.logger, lock).Run(quit)
close(result)
}()
signals := make(chan os.Signal, 2)
signal.Notify(signals, syscall.SIGTERM, os.Interrupt)
LOOP:
for {
select {
case <-signals:
// try to clean up locks on ^C
close(quit)
// do not exit right away - the session and result channels will be
// closed after the quit is requested, ensuring that the locks held
// by the farm were released.
r.logger.NoFields().Errorln("Got signal, exiting")
case <-sessions:
r.logger.NoFields().Fatalln("Lost session")
case res := <-result:
// done, either due to ^C (already printed message above) or
// clean finish
if res {
r.logger.NoFields().Infoln("Done")
}
break LOOP
}
}
}
func (r rctlParams) ScheduleUpdate(oldID, newID string, want, need int) {
_, err := r.rls.CreateRollingUpdateFromExistingRCs(roll_fields.Update{
OldRC: rc_fields.ID(oldID),
NewRC: rc_fields.ID(newID),
DesiredReplicas: want,
MinimumReplicas: need,
}, nil, nil)
if err != nil {
r.logger.WithError(err).Fatalln("Could not create rolling update")
} else {
r.logger.WithField("id", newID).Infoln("Created new rolling update")
}
}
func TestCreateRollingUpdateFromExistingRCs(t *testing.T) {
rollstore := newRollStore(t, nil)
newRCID := rc_fields.ID("new_rc")
oldRCID := rc_fields.ID("old_rc")
update := fields.Update{
NewRC: newRCID,
OldRC: oldRCID,
}
newRCLabels := klabels.Set(map[string]string{
"some_key": "some_val",
})
u, err := rollstore.CreateRollingUpdateFromExistingRCs(update, newRCLabels, newRCLabels)
if err != nil {
t.Fatalf("Unexpected error creating update: %s", err)
}
storedUpdate, err := rollstore.Get(update.ID())
if err != nil {
t.Fatalf("Unable to retrieve value put in roll store: %s", err)
}
if storedUpdate.NewRC != newRCID {
t.Errorf("Stored update didn't have expected new rc value: wanted '%s' but got '%s'", newRCID, storedUpdate.NewRC)
}
if storedUpdate.OldRC != oldRCID {
t.Errorf("Stored update didn't have expected old rc value: wanted '%s' but got '%s'", oldRCID, storedUpdate.OldRC)
}
rcLabels, err := rollstore.labeler.GetLabels(labels.RC, newRCID.String())
if err != nil {
t.Fatalf("Unable to fetch labels for newly created new RC: %s", err)
}
if rcLabels.Labels["some_key"] != "some_val" {
t.Errorf("Expected labels to be set on new RC")
}
ruLabels, err := rollstore.labeler.GetLabels(labels.RU, u.ID().String())
if err != nil {
t.Fatalf("Unable to fetch labels for newly created new RU: %s", err)
}
if ruLabels.Labels["some_key"] != "some_val" {
t.Errorf("Expected labels to be set on new RU")
}
}
func (r RCtl) ScheduleUpdate(oldID, newID string, want, need int, deletes bool) {
err := r.rls.Put(roll_fields.Update{
OldRC: rc_fields.ID(oldID),
NewRC: rc_fields.ID(newID),
DesiredReplicas: want,
MinimumReplicas: need,
DeletePods: deletes,
})
if err != nil {
r.logger.WithError(err).Fatalln("Could not create rolling update")
} else {
r.logger.WithField("id", newID).Infoln("Created new rolling update")
}
}
func (r rctlParams) Delete(id string, force bool) {
err := r.rcs.Delete(rc_fields.ID(id), force)
if err != nil {
r.logger.WithError(err).Fatalln("Could not delete replication controller in Consul")
}
r.logger.WithField("id", id).Infoln("Deleted replication controller")
}
func (r rctlParams) Disable(id string) {
err := r.rcs.Disable(rc_fields.ID(id))
if err != nil {
r.logger.WithError(err).Fatalln("Could not disable replication controller in Consul")
}
r.logger.WithField("id", id).Infoln("Disabled replication controller")
}
func (r RCtl) Enable(id string) {
err := r.rcs.Enable(rc_fields.ID(id))
if err != nil {
r.logger.WithError(err).Fatalln("Could not enable replication controller in Consul")
}
r.logger.WithField("id", id).Infoln("Enabled replication controller")
}
// these parts of Create may require a retry
func (s *consulStore) innerCreate(manifest pods.Manifest, nodeSelector klabels.Selector, podLabels klabels.Set) (fields.RC, error) {
id := fields.ID(uuid.New())
rcp := kp.RCPath(id.String())
rc := fields.RC{
ID: id,
Manifest: manifest,
NodeSelector: nodeSelector,
PodLabels: podLabels,
ReplicasDesired: 0,
Disabled: false,
}
jsonRC, err := json.Marshal(rc)
if err != nil {
return fields.RC{}, err
}
success, _, err := s.kv.CAS(&api.KVPair{
Key: rcp,
Value: jsonRC,
// the chance of the UUID already existing is vanishingly small, but
// technically not impossible, so we should use the CAS index to guard
// against duplicate UUIDs
ModifyIndex: 0,
}, nil)
if err != nil {
return fields.RC{}, consulutil.NewKVError("cas", rcp, err)
}
if !success {
return fields.RC{}, CASError(rcp)
}
return rc, nil
}
func TestLockTypeFromKey(t *testing.T) {
store := consulStore{}
expectedRCID := fields.ID("abcd-1234")
mutationLockPath, err := store.mutationLockPath(expectedRCID)
if err != nil {
t.Fatalf("Unable to compute lock path for rc")
}
updateCreationLockPath, err := store.updateCreationLockPath(expectedRCID)
if err != nil {
t.Fatalf("Unable to compute lock path for rc")
}
ownershipLockPath, err := store.ownershipLockPath(expectedRCID)
if err != nil {
t.Fatalf("Unable to compute lock path for rc")
}
type lockTypeExpectation struct {
Key string
ExpectedType LockType
ExpectError bool
}
expectations := []lockTypeExpectation{
{mutationLockPath, MutationLockType, false},
{updateCreationLockPath, UpdateCreationLockType, false},
{ownershipLockPath, OwnershipLockType, false},
{"bogus_key", UnknownLockType, true},
{"/lock/bogus_key", UnknownLockType, true},
{"/lock/replication_controllers/bogus/key/blah", UnknownLockType, true},
}
for _, expectation := range expectations {
rcId, lockType, err := store.lockTypeFromKey(expectation.Key)
if lockType != expectation.ExpectedType {
t.Errorf("Expected lock type for %s to be %s, was %s", expectation.Key, expectation.ExpectedType.String(), lockType.String())
}
if expectation.ExpectError {
if err == nil {
t.Errorf("Expected an error to be returned for key %s, but there wasn't", expectation.Key)
}
} else {
if err != nil {
t.Errorf("Unexpected error for key %s: %s", expectation.Key, err)
}
if rcId != expectedRCID {
t.Errorf("Expected returned rcID to be '%s', was '%s'", expectedRCID, rcId)
}
}
}
}
func TestCreateRollingUpdateFromOneExistingRCWithIDFailsIfCantAcquireLock(t *testing.T) {
oldRCID := rc_fields.ID("old_rc")
rollstore := newRollStore(t, nil)
// Grab an update creation lock on the old RC and make sure the
// creation fails
session, _, err := rollstore.store.NewSession("conflicting session", nil)
if err != nil {
t.Fatalf("Unable to create session for conflicting lock: %s", err)
}
defer session.Destroy()
_, err = rollstore.rcstore.LockForUpdateCreation(oldRCID, session)
if err != nil {
t.Fatalf("Unable to acquire conflicting lock on old rc: %s", err)
}
newUpdate, err := rollstore.CreateRollingUpdateFromOneExistingRCWithID(
oldRCID,
1,
0,
false,
0,
testManifest(),
testNodeSelector(),
nil,
nil,
nil,
)
if err == nil {
t.Fatalf("Should have erred creating conflicting update")
}
update, err := rollstore.Get(fields.ID(newUpdate.NewRC))
if err != nil {
t.Fatalf("Should nothave erred checking for update creation: %s", err)
}
if update.NewRC != "" {
t.Fatalf("Update was created but shouldn't have been: %s", err)
}
rcs, err := rollstore.rcstore.List()
if err != nil {
t.Fatalf("Shouldn't have failed to list RCs: %s", err)
}
if len(rcs) != 0 {
t.Fatalf("There shouldn't be any new RCs after a failed update: expect 0 but were %d", len(rcs))
}
}
func (rm *P2RM) checkForManagingReplicationController() (bool, fields.ID, error) {
podLabels, err := rm.Labeler.GetLabels(labels.POD, rm.LabelID)
if err != nil {
return false, "", fmt.Errorf("unable to check node for labels: %v", err)
}
if podLabels.Labels.Has(rc.RCIDLabel) {
return true, fields.ID(podLabels.Labels.Get(rc.RCIDLabel)), nil
}
return false, "", nil
}
// Test that if a conflicting update exists, a new one will not be admitted
func TestCreateExistingRCsMutualExclusion(t *testing.T) {
newRCID := rc_fields.ID("new_rc")
oldRCID := rc_fields.ID("old_rc")
conflictingEntry := fields.Update{
OldRC: newRCID,
NewRC: rc_fields.ID("some_other_rc"),
}
rollstore := newRollStore(t, []fields.Update{conflictingEntry})
update := fields.Update{
NewRC: newRCID,
OldRC: oldRCID,
}
_, err := rollstore.CreateRollingUpdateFromExistingRCs(update, nil, nil)
if err == nil {
t.Fatal("Expected update creation to fail due to conflict")
}
if conflictingErr, ok := err.(*ConflictingRUError); !ok {
t.Error("Returned error didn't have ConflictingRUError type")
} else {
if conflictingErr.ConflictingID != conflictingEntry.ID() {
t.Errorf("Expected error to have conflicting ID of '%s', was '%s'", conflictingEntry.ID(), conflictingErr.ConflictingID)
}
if conflictingErr.ConflictingRCID != conflictingEntry.OldRC {
t.Errorf("Expected error to have conflicting rc ID of '%s', was '%s'", conflictingEntry.OldRC, conflictingErr.ConflictingRCID)
}
}
ru, _ := rollstore.Get(fields.ID(update.NewRC))
if ru.NewRC != "" || ru.OldRC != "" {
t.Fatal("New ru shouldn't have been created but it was")
}
}
func (r rctlParams) SetReplicas(id string, replicas int) {
if replicas < 0 {
r.logger.NoFields().Fatalln("Cannot set negative replica count")
}
err := r.rcs.SetDesiredReplicas(rc_fields.ID(id), replicas)
if err != nil {
r.logger.WithError(err).Fatalln("Could not set desired replica count in Consul")
}
r.logger.WithFields(logrus.Fields{
"id": id,
"replicas": replicas,
}).Infoln("Set desired replica count of replication controller")
}
func TestLockRCs(t *testing.T) {
fakeStore := kptest.NewFakePodStore(nil, nil)
session, _, err := fakeStore.NewSession("fake rc lock session", nil)
Assert(t).IsNil(err, "Should not have erred getting fake session")
update := NewUpdate(fields.Update{
NewRC: rc_fields.ID("new_rc"),
OldRC: rc_fields.ID("old_rc"),
},
nil,
rcstore.NewFake(),
nil,
nil,
nil,
logging.DefaultLogger,
session,
nil,
).(*update)
err = update.lockRCs(make(<-chan struct{}))
Assert(t).IsNil(err, "should not have erred locking RCs")
Assert(t).IsNotNil(update.newRCUnlocker, "should have consulutil.Unlocker for unlocking new rc")
Assert(t).IsNotNil(update.oldRCUnlocker, "should have consulutil.Unlocker for unlocking old rc")
}
func createHelloReplicationController(dir string) (fields.ID, error) {
hello := fmt.Sprintf("file://%s", util.From(runtime.Caller(0)).ExpandPath("../hoisted-hello_def456.tar.gz"))
builder := manifest.NewBuilder()
builder.SetID("hello")
builder.SetStatusPort(43770)
stanzas := map[launch.LaunchableID]launch.LaunchableStanza{
"hello": {
LaunchableId: "hello",
LaunchableType: "hoist",
Location: hello,
},
}
builder.SetLaunchables(stanzas)
manifest := builder.GetManifest()
manifestPath := path.Join(dir, "hello.yaml")
f, err := os.OpenFile(manifestPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return fields.ID(""), err
}
defer f.Close()
err = manifest.Write(f)
if err != nil {
return fields.ID(""), err
}
f.Close()
manifestPath, err = signManifest(manifestPath, dir)
if err != nil {
return fields.ID(""), err
}
cmd := exec.Command("p2-rctl", "--log-json", "create", "--manifest", manifestPath, "--node-selector", "test=yes")
out := bytes.Buffer{}
cmd.Stdout = &out
cmd.Stderr = &out
err = cmd.Run()
if err != nil {
return fields.ID(""), fmt.Errorf("Couldn't create replication controller for hello: %s %s", out.String(), err)
}
var rctlOut struct {
ID string `json:"id"`
}
err = json.Unmarshal(out.Bytes(), &rctlOut)
if err != nil {
return fields.ID(""), fmt.Errorf("Couldn't read RC ID out of p2-rctl invocation result: %v", err)
}
return fields.ID(rctlOut.ID), exec.Command("p2-rctl", "set-replicas", rctlOut.ID, "1").Run()
}
func rollsWithIDs(t *testing.T, id string, num int) api.KVPairs {
var pairs api.KVPairs
for i := 0; i < num; i++ {
ru := fields.Update{
NewRC: rc_fields.ID(id),
}
jsonRU, err := json.Marshal(ru)
if err != nil {
t.Fatalf("Unable to marshal test RU as json: %s", err)
}
pairs = append(pairs, &api.KVPair{
Value: jsonRU,
})
}
return pairs
}
func (r rctlParams) Get(id string, manifest bool) {
getRC, err := r.rcs.Get(rc_fields.ID(id))
if err != nil {
r.logger.WithError(err).Fatalln("Could not get replication controller in Consul")
}
if manifest {
out, err := getRC.Manifest.Marshal()
if err != nil {
r.logger.WithError(err).Fatalln("Could not marshal replication controller manifest")
}
fmt.Printf("%s", out)
} else {
out, err := json.MarshalIndent(getRC, "", " ")
if err != nil {
r.logger.WithError(err).Fatalln("Could not marshal replication controller to JSON")
}
fmt.Printf("%s\n", out)
}
}
func rcsWithIDs(t *testing.T, id string, num int) api.KVPairs {
var pairs api.KVPairs
builder := manifest.NewBuilder()
builder.SetID("slug")
manifest := builder.GetManifest()
for i := 0; i < num; i++ {
rc := fields.RC{
ID: fields.ID(id),
Manifest: manifest,
}
jsonRC, err := json.Marshal(rc)
if err != nil {
t.Fatalf("Unable to marshal test RC as json: %s", err)
}
pairs = append(pairs, &api.KVPair{
Value: jsonRC,
})
}
return pairs
}
func (s *fakeStore) Create(manifest pods.Manifest, nodeSelector labels.Selector, podLabels labels.Set) (fields.RC, error) {
// A real replication controller will use a UUID.
// We'll just use a monotonically increasing counter for expedience.
s.creates += 1
id := fields.ID(strconv.Itoa(s.creates))
entry := fakeEntry{
RC: fields.RC{
ID: id,
Manifest: manifest,
NodeSelector: nodeSelector,
PodLabels: podLabels,
ReplicasDesired: 0,
Disabled: false,
},
watchers: make(map[int]chan struct{}),
lastWatcherId: 0,
}
s.rcs[id] = &entry
return entry.RC, nil
}
package rcstore
import (
"fmt"
"testing"
"github.com/square/p2/pkg/kp/consulutil"
"github.com/square/p2/pkg/kp/kptest"
"github.com/square/p2/pkg/rc/fields"
)
const testRCId = fields.ID("abcd-1234")
func TestLockForOwnership(t *testing.T) {
kpStore := kptest.NewFakePodStore(nil, nil)
session, _, err := kpStore.NewSession("test rc ownership session", nil)
if err != nil {
t.Fatalf("Unable to create fake session in fake store: %s", err)
}
rcstore := consulStore{}
unlocker, err := rcstore.LockForOwnership(testRCId, session)
if err != nil {
t.Fatalf("Unable to lock rc for ownership: %s", err)
}
expectedKey := fmt.Sprintf("%s/%s/%s", consulutil.LOCK_TREE, rcTree, testRCId)
if unlocker.Key() != expectedKey {
t.Errorf("Key did not match expected: wanted '%s' but got '%s'", expectedKey, unlocker.Key())
}
"github.com/square/p2/pkg/kp"
"github.com/square/p2/pkg/kp/consulutil"
"github.com/square/p2/pkg/kp/kptest"
"github.com/square/p2/pkg/kp/rcstore"
"github.com/square/p2/pkg/labels"
"github.com/square/p2/pkg/manifest"
rc_fields "github.com/square/p2/pkg/rc/fields"
"github.com/square/p2/pkg/roll/fields"
"github.com/hashicorp/consul/api"
klabels "k8s.io/kubernetes/pkg/labels"
)
const (
testRCId = rc_fields.ID("abcd-1234")
testRCId2 = rc_fields.ID("def-456")
)
func TestNewConsul(t *testing.T) {
store := NewConsul(kp.NewConsulClient(kp.Options{}), nil)
rollstore := store.(consulStore)
if rollstore.kv == nil {
t.Fatal("kv should not be nil for constructed rollstore")
}
if rollstore.rcstore == nil {
t.Fatal("rcstore should not be nil for constructed rollstore")
}
if rollstore.labeler == nil {
func TestCreateRollingUpdateFromOneExistingRCWithID(t *testing.T) {
oldRCID := rc_fields.ID("old_rc")
rollstore := newRollStore(t, nil)
newRCLabels := klabels.Set(map[string]string{
"some_key": "some_val",
})
newUpdate, err := rollstore.CreateRollingUpdateFromOneExistingRCWithID(
oldRCID,
1,
0,
false,
0,
testManifest(),
testNodeSelector(),
nil,
newRCLabels,
newRCLabels,
)
if err != nil {
t.Fatalf("Unable to create rolling update: %s", err)
}
storedUpdate, err := rollstore.Get(fields.ID(newUpdate.NewRC))
if err != nil {
t.Fatalf("Unable to retrieve value put in roll store: %s", err)
}
if storedUpdate.NewRC != newUpdate.NewRC {
t.Errorf("Stored update didn't have expected new rc value: wanted '%s' but got '%s'", newUpdate.NewRC, storedUpdate.NewRC)
}
if storedUpdate.OldRC != oldRCID {
t.Errorf("Stored update didn't have expected old rc value: wanted '%s' but got '%s'", oldRCID, storedUpdate.OldRC)
}
_, err = rollstore.rcstore.Get(newUpdate.NewRC)
if err != nil {
t.Fatalf("Shouldn't have failed to fetch new RC: %s", err)
}
rcLabels, err := rollstore.labeler.GetLabels(labels.RC, storedUpdate.NewRC.String())
if err != nil {
t.Fatalf("Unable to fetch labels for newly created new RC: %s", err)
}
if rcLabels.Labels["some_key"] != "some_val" {
t.Errorf("Expected labels to be set on new RC")
}
ruLabels, err := rollstore.labeler.GetLabels(labels.RU, newUpdate.ID().String())
if err != nil {
t.Fatalf("Unable to fetch labels for newly created new RU: %s", err)
}
if ruLabels.Labels["some_key"] != "some_val" {
t.Errorf("Expected labels to be set on new RU")
}
}
func (r rctlParams) RollingUpdate(oldID, newID string, want, need int, pagerdutyServiceKey string) {
if want < need {
r.logger.WithFields(logrus.Fields{
"want": want,
"need": need,
}).Fatalln("Cannot run update with desired replicas less than minimum replicas")
}
sessions := make(chan string)
quit := make(chan struct{})
go consulutil.SessionManager(api.SessionEntry{
Name: SessionName(),
LockDelay: 5 * time.Second,
Behavior: api.SessionBehaviorDelete,
TTL: "15s",
}, r.baseClient, sessions, quit, r.logger)
sessionID := <-sessions
if sessionID == "" {
r.logger.NoFields().Fatalln("Could not acquire session")
}
session := r.kps.NewUnmanagedSession(sessionID, "")
alerter := alerting.NewNop()
if pagerdutyServiceKey != "" {
var err error
alerter, err = alerting.NewPagerduty(pagerdutyServiceKey, r.httpClient)
if err != nil {
r.logger.WithError(err).Fatalln("Could not initialize pagerduty alerter")
}
}
result := make(chan bool, 1)
go func() {
result <- roll.NewUpdate(roll_fields.Update{
OldRC: rc_fields.ID(oldID),
NewRC: rc_fields.ID(newID),
DesiredReplicas: want,
MinimumReplicas: need,
}, r.kps, r.rcs, r.hcheck, r.labeler, r.sched, r.logger, session, alerter).Run(quit)
close(result)
}()
signals := make(chan os.Signal, 2)
signal.Notify(signals, syscall.SIGTERM, os.Interrupt)
LOOP:
for {
select {
case <-signals:
// try to clean up locks on ^C
close(quit)
// do not exit right away - the session and result channels will be
// closed after the quit is requested, ensuring that the locks held
// by the farm were released.
r.logger.NoFields().Errorln("Got signal, exiting")
case <-sessions:
r.logger.NoFields().Fatalln("Lost session")
case res := <-result:
// done, either due to ^C (already printed message above) or
// clean finish
if res {
r.logger.NoFields().Infoln("Done")
}
break LOOP
}
}
}
// Creates a rolling update that may or may not already have an existing old
// RC. If one matches the oldRCSelector, it will be used as the old RC in the
// new update. If one does not exist, a "dummy" old RC will be created that is
// identical to the specifications for the new RC.
// Returns an error if the old RC exists but is part of another RU, or if
// the label selector returns more than one match.
func (s consulStore) CreateRollingUpdateFromOneMaybeExistingWithLabelSelector(
oldRCSelector klabels.Selector,
desiredReplicas int,
minimumReplicas int,
leaveOld bool,
rollDelay time.Duration,
newRCManifest manifest.Manifest,
newRCNodeSelector klabels.Selector,
newRCPodLabels klabels.Set,
newRCLabels klabels.Set,
rollLabels klabels.Set,
) (u roll_fields.Update, err error) {
// This function may or may not create old and new RCs and subsequently
// fail, so we defer a function that does any cleanup (if applicable)
var cleanupOldRC func()
var cleanupNewRC func()
defer func() {
if err != nil {
if cleanupOldRC != nil {
cleanupOldRC()
}
if cleanupNewRC != nil {
cleanupNewRC()
}
}
}()
session, renewalErrCh, err := s.newRUCreationSession()
if err != nil {
return roll_fields.Update{}, err
}
defer session.Destroy()
// Check if any RCs match the oldRCSelector
matches, err := s.labeler.GetMatches(oldRCSelector, labels.RC, false)
if err != nil {
return roll_fields.Update{}, err
}
var oldRCID rc_fields.ID
if len(matches) > 1 {
return roll_fields.Update{}, AmbiguousRCSelector
} else if len(matches) == 1 {
oldRCID = rc_fields.ID(matches[0].ID)
} else {
if leaveOld {
return roll_fields.Update{}, util.Errorf(
"Can't create an update with LeaveOld set if there is no old RC (sel=%s)",
oldRCSelector.String(),
)
}
// Create the old RC using the same info as the new RC, it'll be
// removed when the update completes anyway
rc, err := s.rcstore.Create(newRCManifest, newRCNodeSelector, newRCPodLabels)
if err != nil {
return roll_fields.Update{}, err
}
oldRCID = rc.ID
cleanupOldRC = func() {
err = s.rcstore.Delete(oldRCID, false)
if err != nil {
s.logger.WithError(err).Errorf("Unable to cleanup newly-created old RC %s after update creation failure:", oldRCID)
}
// Any labels we wrote will be deleted by rcstore.Delete()
}
// Copy the new RC labels to the old RC as well
err = s.labeler.SetLabels(labels.RC, oldRCID.String(), newRCLabels)
if err != nil {
return roll_fields.Update{}, err
}
}
// Lock the old RC to guarantee that no new updates can use it
err = s.lockRCs(rc_fields.IDs{oldRCID}, session)
if err != nil {
return roll_fields.Update{}, err
}
// Check for updates that exist that operate on the old RC
err = s.checkForConflictingUpdates(rc_fields.IDs{oldRCID})
if err != nil {
return roll_fields.Update{}, err
}
// Create the new RC
var newRCID rc_fields.ID
select {
case err = <-renewalErrCh:
return roll_fields.Update{}, err
default:
rc, err := s.rcstore.Create(newRCManifest, newRCNodeSelector, newRCPodLabels)
if err != nil {
return roll_fields.Update{}, err
}
newRCID = rc.ID
}
cleanupNewRC = func() {
err = s.rcstore.Delete(newRCID, false)
if err != nil {
s.logger.WithError(err).Errorf("Unable to cleanup newly-created new RC %s after update creation failure:", newRCID)
}
// Any labels we wrote will be deleted by rcstore.Delete()
}
// lock newly-created new rc so it's less likely to race on it
// with another parallel update creation
err = s.lockRCs(rc_fields.IDs{newRCID}, session)
if err != nil {
return roll_fields.Update{}, err
}
// Check once again for conflicting updates in case a racing update
// creation grabbed the new RC we just created
err = s.checkForConflictingUpdates(rc_fields.IDs{newRCID})
if err != nil {
return roll_fields.Update{}, err
}
// Now that we know there are no RUs in progress, and we have the
// update creation locks, we can safely apply labels.
err = s.labeler.SetLabels(labels.RC, newRCID.String(), newRCLabels)
if err != nil {
return roll_fields.Update{}, err
}
u = roll_fields.Update{
OldRC: oldRCID,
NewRC: newRCID,
DesiredReplicas: desiredReplicas,
MinimumReplicas: minimumReplicas,
LeaveOld: leaveOld,
RollDelay: rollDelay,
}
return s.attemptRUCreation(u, rollLabels, renewalErrCh)
}
