func (a *API) ping(w http.ResponseWriter, req *http.Request, _ httprouter.Params) {
logger := a.logger().New("fn", "ping")
logger.Info("checking status", "host", serviceHost)
if status, err := sirenia.NewClient(serviceHost + ":3306").Status(); err == nil && status.Database != nil && status.Database.ReadWrite {
logger.Info("database is up, skipping scale check")
} else {
scaled, err := scale.CheckScale(app, controllerKey, "mongodb", a.logger())
if err != nil {
httphelper.Error(w, err)
return
}
// Cluster has yet to be scaled, return healthy
if !scaled {
w.WriteHeader(200)
return
}
}
session, err := mgo.DialWithInfo(&mgo.DialInfo{
Addrs: []string{net.JoinHostPort(serviceHost, "27017")},
Username: "******",
Password: os.Getenv("MONGO_PWD"),
Database: "admin",
})
if err != nil {
httphelper.Error(w, err)
return
}
defer session.Close()
w.WriteHeader(200)
}
func (f *ClusterFixer) CheckSirenia(svc string) error {
log := f.l.New("fn", "CheckSirenia", "service", svc)
log.Info("checking sirenia cluster status")
service := discoverd.NewService(svc)
leader, _ := service.Leader()
if leader == nil || leader.Addr == "" {
log.Info("no running leader")
leader = nil
} else {
log.Info("found running leader")
}
instances, _ := service.Instances()
log.Info("found running instances", "count", len(instances))
log.Info("getting sirenia status")
var status *sirenia.Status
if leader != nil && leader.Addr != "" {
client := sirenia.NewClient(leader.Addr)
var err error
status, err = client.Status()
if err != nil {
log.Error("error getting status from leader", "error", err)
}
}
if status != nil && status.Database != nil && status.Database.ReadWrite {
log.Info("cluster claims to be read-write")
return nil
}
return fmt.Errorf("cluster isn't read-write")
}
func (a *API) ping(ctx context.Context, w http.ResponseWriter, req *http.Request) {
logger := a.logger().New("fn", "ping")
logger.Info("checking status", "host", serviceHost)
if status, err := sirenia.NewClient(serviceHost + ":3306").Status(); err == nil && status.Database != nil && status.Database.ReadWrite {
logger.Info("database is up, skipping scale check")
} else {
scaled, err := scale.CheckScale(app, controllerKey, "mariadb", a.logger())
if err != nil {
httphelper.Error(w, err)
return
}
// Cluster has yet to be scaled, return healthy
if !scaled {
w.WriteHeader(200)
return
}
}
db, err := a.connect()
if err != nil {
httphelper.Error(w, err)
return
}
defer db.Close()
if _, err := db.Exec("SELECT 1"); err != nil {
httphelper.Error(w, err)
return
}
w.WriteHeader(200)
}
func testSireniaDeploy(client controller.Client, disc *discoverd.Client, t *c.C, d *sireniaDeploy) {
// create app
app := &ct.App{Name: d.name, Strategy: "sirenia"}
t.Assert(client.CreateApp(app), c.IsNil)
// copy release from default app
release, err := client.GetAppRelease(d.db.appName)
t.Assert(err, c.IsNil)
release.ID = ""
release.Env[d.db.hostKey] = fmt.Sprintf("leader.%s.discoverd", d.name)
release.Env[d.db.serviceKey] = d.name
procName := release.Env["SIRENIA_PROCESS"]
proc := release.Processes[procName]
delete(proc.Env, "SINGLETON")
proc.Service = d.name
release.Processes[procName] = proc
t.Assert(client.CreateRelease(release), c.IsNil)
t.Assert(client.SetAppRelease(app.ID, release.ID), c.IsNil)
oldRelease := release.ID
// create formation
discEvents := make(chan *discoverd.Event)
discService := disc.Service(d.name)
discStream, err := discService.Watch(discEvents)
t.Assert(err, c.IsNil)
defer discStream.Close()
jobEvents := make(chan *ct.Job)
jobStream, err := client.StreamJobEvents(d.name, jobEvents)
t.Assert(err, c.IsNil)
defer jobStream.Close()
t.Assert(client.PutFormation(&ct.Formation{
AppID: app.ID,
ReleaseID: release.ID,
Processes: map[string]int{procName: d.sireniaJobs, "web": d.webJobs},
}), c.IsNil)
// watch cluster state changes
type stateChange struct {
state *state.State
err error
}
stateCh := make(chan stateChange)
go func() {
for event := range discEvents {
if event.Kind != discoverd.EventKindServiceMeta {
continue
}
var state state.State
if err := json.Unmarshal(event.ServiceMeta.Data, &state); err != nil {
stateCh <- stateChange{err: err}
return
}
primary := ""
if state.Primary != nil {
primary = state.Primary.Addr
}
sync := ""
if state.Sync != nil {
sync = state.Sync.Addr
}
var async []string
for _, a := range state.Async {
async = append(async, a.Addr)
}
debugf(t, "got cluster state: index=%d primary=%s sync=%s async=%s",
event.ServiceMeta.Index, primary, sync, strings.Join(async, ","))
stateCh <- stateChange{state: &state}
}
}()
// wait for correct cluster state and number of web processes
var sireniaState state.State
var webJobs int
ready := func() bool {
if webJobs != d.webJobs {
return false
}
if sireniaState.Primary == nil {
return false
}
if d.sireniaJobs > 1 && sireniaState.Sync == nil {
return false
}
if d.sireniaJobs > 2 && len(sireniaState.Async) != d.sireniaJobs-2 {
return false
}
return true
}
for {
if ready() {
break
}
select {
case s := <-stateCh:
t.Assert(s.err, c.IsNil)
sireniaState = *s.state
case e, ok := <-jobEvents:
if !ok {
t.Fatalf("job event stream closed: %s", jobStream.Err())
}
debugf(t, "got job event: %s %s %s", e.Type, e.ID, e.State)
if e.Type == "web" && e.State == ct.JobStateUp {
webJobs++
}
case <-time.After(30 * time.Second):
t.Fatal("timed out waiting for formation")
}
}
// wait for the primary to indicate downstream replication sync
debug(t, "waiting for primary to indicate downstream replication sync")
sireniaClient := sc.NewClient(sireniaState.Primary.Addr)
t.Assert(sireniaClient.WaitForReplSync(sireniaState.Sync, 1*time.Minute), c.IsNil)
// connect to the db so we can test writes
d.db.initDb(t, release, d)
// check currently writeable
d.db.assertWriteable(t, release, d)
// check a deploy completes with expected cluster state changes
release.ID = ""
t.Assert(client.CreateRelease(release), c.IsNil)
newRelease := release.ID
deployment, err := client.CreateDeployment(app.ID, newRelease)
t.Assert(err, c.IsNil)
deployEvents := make(chan *ct.DeploymentEvent)
deployStream, err := client.StreamDeployment(deployment, deployEvents)
t.Assert(err, c.IsNil)
defer deployStream.Close()
// assertNextState checks that the next state received is in the remaining states
// that were expected, so handles the fact that some states don't happen, but the
// states that do happen are expected and in-order.
assertNextState := func(remaining []expectedSireniaState) int {
var state state.State
loop:
for {
select {
case s := <-stateCh:
t.Assert(s.err, c.IsNil)
if len(s.state.Async) < d.expectedAsyncs() {
// we shouldn't usually receive states with less asyncs than
// expected, but they can occur as an intermediate state between
// two expected states (e.g. when a sync does a takeover at the
// same time as a new async is started) so just ignore them.
debug(t, "ignoring state with too few asyncs")
continue
}
state = *s.state
break loop
case <-time.After(60 * time.Second):
t.Fatal("timed out waiting for cluster state")
}
}
if state.Primary == nil {
t.Fatal("no primary configured")
}
log := func(format string, v ...interface{}) {
debugf(t, "skipping expected state: %s", fmt.Sprintf(format, v...))
}
outer:
for i, expected := range remaining {
if state.Primary.Meta["FLYNN_RELEASE_ID"] != expected.Primary {
log("primary has incorrect release")
continue
}
if state.Sync == nil {
if expected.Sync == "" {
return i
}
log("state has no sync node")
continue
}
if state.Sync.Meta["FLYNN_RELEASE_ID"] != expected.Sync {
log("sync has incorrect release")
continue
}
if state.Async == nil {
if expected.Async == nil {
return i
}
log("state has no async nodes")
continue
}
if len(state.Async) != len(expected.Async) {
log("expected %d asyncs, got %d", len(expected.Async), len(state.Async))
continue
}
for i, release := range expected.Async {
if state.Async[i].Meta["FLYNN_RELEASE_ID"] != release {
log("async[%d] has incorrect release", i)
continue outer
}
}
return i
}
t.Fatal("unexpected state")
return -1
}
expected := d.expected(oldRelease, newRelease)
var expectedIndex, newWebJobs int
loop:
for {
select {
case e, ok := <-deployEvents:
if !ok {
t.Fatal("unexpected close of deployment event stream")
}
switch e.Status {
case "complete":
break loop
case "failed":
t.Fatalf("deployment failed: %s", e.Error)
}
debugf(t, "got deployment event: %s %s", e.JobType, e.JobState)
if e.JobState != ct.JobStateUp && e.JobState != ct.JobStateDown {
continue
}
switch e.JobType {
case procName:
// move on if we have seen all the expected events
if expectedIndex >= len(expected) {
continue
}
skipped := assertNextState(expected[expectedIndex:])
expectedIndex += 1 + skipped
case "web":
if e.JobState == ct.JobStateUp && e.ReleaseID == newRelease {
newWebJobs++
}
}
case <-time.After(2 * time.Minute):
t.Fatal("timed out waiting for deployment")
}
}
// check we have the correct number of new web jobs
t.Assert(newWebJobs, c.Equals, d.webJobs)
// check writeable now deploy is complete
d.db.assertWriteable(t, release, d)
}
// ScaleUp scales up a dormant Sirenia cluster
func ScaleUp(app, controllerKey, serviceAddr, procName, singleton string, logger log15.Logger) error {
logger = logger.New("fn", "ScaleUp")
sc := sirenia.NewClient(serviceAddr)
logger.Info("checking status", "host", serviceAddr)
if status, err := sc.Status(); err == nil && status.Database != nil && status.Database.ReadWrite {
logger.Info("database is up, skipping scale")
// Skip the rest, the database is already available
return nil
} else if err != nil {
logger.Info("error checking status", "err", err)
} else {
logger.Info("got status, but database is not read-write")
}
// Connect to controller.
logger.Info("connecting to controller")
client, err := controller.NewClient("", controllerKey)
if err != nil {
logger.Error("controller client error", "err", err)
return err
}
// Retrieve the app release.
logger.Info("retrieving app release", "app", app)
release, err := client.GetAppRelease(app)
if err == controller.ErrNotFound {
logger.Error("release not found", "app", app)
return errors.New("release not found")
} else if err != nil {
logger.Error("get release error", "app", app, "err", err)
return err
}
// Retrieve current formation.
logger.Info("retrieving formation", "app", app, "release_id", release.ID)
formation, err := client.GetFormation(app, release.ID)
if err == controller.ErrNotFound {
logger.Error("formation not found", "app", app, "release_id", release.ID)
return errors.New("formation not found")
} else if err != nil {
logger.Error("formation error", "app", app, "release_id", release.ID, "err", err)
return err
}
// If database is running then exit.
if formation.Processes[procName] > 0 {
logger.Info("database is running, scaling not necessary")
return nil
}
// Copy processes and increase database processes.
processes := make(map[string]int, len(formation.Processes))
for k, v := range formation.Processes {
processes[k] = v
}
if singleton == "true" {
processes[procName] = 1
} else {
processes[procName] = 3
}
// Update formation.
logger.Info("updating formation", "app", app, "release_id", release.ID)
formation.Processes = processes
if err := client.PutFormation(formation); err != nil {
logger.Error("put formation error", "app", app, "release_id", release.ID, "err", err)
return err
}
if err := sc.WaitForReadWrite(5 * time.Minute); err != nil {
logger.Error("wait for read write", "err", err)
return errors.New("timed out while starting sirenia cluster")
}
logger.Info("scaling complete")
return nil
}
func (f *ClusterFixer) FixSirenia(svc string) error {
log := f.l.New("fn", "FixSirenia", "service", svc)
service := discoverd.NewService(svc)
instances, _ := service.Instances()
leader, _ := service.Leader()
log.Info("getting service metadata")
meta, err := service.GetMeta()
if err != nil {
return fmt.Errorf("error getting sirenia state from discoverd: %s", err)
}
var state state.State
if err := json.Unmarshal(meta.Data, &state); err != nil {
return fmt.Errorf("error decoding state: %s", err)
}
if state.Primary == nil {
return fmt.Errorf("no primary in sirenia state")
}
log.Info("getting primary job info", "job.id", state.Primary.Meta["FLYNN_JOB_ID"])
primaryJob, primaryHost, err := f.GetJob(state.Primary.Meta["FLYNN_JOB_ID"])
if err != nil {
log.Error("unable to get primary job info")
}
var syncJob *host.Job
var syncHost *cluster.Host
if state.Sync != nil {
log.Info("getting sync job info", "job.id", state.Sync.Meta["FLYNN_JOB_ID"])
syncJob, syncHost, err = f.GetJob(state.Sync.Meta["FLYNN_JOB_ID"])
if err != nil {
log.Error("unable to get sync job info")
}
}
waitForInstance := func(jobID string) (func() (string, error), error) {
watchCh := make(chan *discoverd.Event)
upCh := make(chan string)
stream, err := service.Watch(watchCh)
if err != nil {
return nil, fmt.Errorf("error watching discoverd service: %s", err)
}
go func() {
var current bool
for event := range watchCh {
if event.Kind == discoverd.EventKindCurrent {
current = true
continue
}
if !current || event.Kind != discoverd.EventKindUp {
continue
}
if event.Instance.Meta["FLYNN_JOB_ID"] == jobID {
upCh <- event.Instance.Addr
}
}
}()
return func() (string, error) {
log.Info("waiting for instance to start", "job.id", jobID)
defer stream.Close()
select {
case addr := <-upCh:
return addr, nil
case <-time.After(time.Minute):
return "", fmt.Errorf("timed out waiting for sirenia instance to come up")
}
}, nil
}
log.Info("terminating unassigned sirenia instances")
outer:
for _, i := range instances {
if i.Addr == state.Primary.Addr || (state.Sync != nil && i.Addr == state.Sync.Addr) {
continue
}
for _, a := range state.Async {
if i.Addr == a.Addr {
continue outer
}
}
// job not assigned in state, attempt to terminate it
if jobID, ok := i.Meta["FLYNN_JOB_ID"]; ok {
hostID, err := cluster.ExtractHostID(jobID)
if err != nil {
log.Error("error extracting host id from jobID", "jobID", jobID, "err", err)
}
h := f.Host(hostID)
if h != nil {
if err := h.StopJob(jobID); err != nil {
log.Error("error stopping unassigned sirenia job", "jobID", jobID)
}
} else {
log.Error("host not found", "hostID", hostID)
}
}
}
isRunning := func(addr string) bool {
for _, i := range instances {
if i.Addr == addr {
return true
}
}
return false
}
// if the leader isn't currently running then start it using primaryJob/primaryHost
var wait func() (string, error)
if !isRunning(state.Primary.Addr) {
// if we don't have info about the primary job attempt to promote the sync
if primaryJob == nil {
if syncJob != nil {
// set primary job to sync
primaryJob = syncJob
primaryHost = syncHost
// nil out sync job now so we can re-allocate it.
syncJob = nil
syncHost = nil
} else {
return fmt.Errorf("neither primary or sync job info available")
}
}
primaryJob.ID = cluster.GenerateJobID(primaryHost.ID(), "")
f.FixJobEnv(primaryJob)
log.Info("starting primary job", "job.id", primaryJob.ID)
wait, err = waitForInstance(primaryJob.ID)
if err != nil {
return err
}
if err := primaryHost.AddJob(primaryJob); err != nil {
return fmt.Errorf("error starting primary job on %s: %s", primaryHost.ID(), err)
}
}
if !state.Singleton && !isRunning(state.Sync.Addr) {
if syncHost == nil {
for _, h := range f.hosts {
if h.ID() != primaryHost.ID() {
syncHost = h
break
}
}
if syncHost == nil {
// if there are no other hosts, use the same one we put the primary on
syncHost = primaryHost
}
}
// if we don't have a sync job then copy the primary job
// and provision a new volume
if syncJob == nil {
syncJob = primaryJob
vol := &ct.VolumeReq{Path: "/data"}
if _, err := utils.ProvisionVolume(vol, syncHost, syncJob); err != nil {
return fmt.Errorf("error creating volume on %s: %s", syncHost.ID(), err)
}
}
syncJob.ID = cluster.GenerateJobID(syncHost.ID(), "")
f.FixJobEnv(syncJob)
log.Info("starting sync job", "job.id", syncJob.ID)
if wait == nil {
wait, err = waitForInstance(syncJob.ID)
if err != nil {
return err
}
}
if err := syncHost.AddJob(syncJob); err != nil {
return fmt.Errorf("error starting additional job on %s: %s", syncHost.ID(), err)
}
}
if wait != nil {
addr, err := wait()
if err != nil {
return err
}
if leader != nil && leader.Addr != "" {
addr = leader.Addr
}
log.Info("waiting for cluster to come up read-write", "addr", addr)
return sirenia.NewClient(addr).WaitForReadWrite(5 * time.Minute)
}
return nil
}
func (f *ClusterFixer) FixSirenia(svc string) error {
log := f.l.New("fn", "FixSirenia", "service", svc)
log.Info("checking sirenia cluster status")
service := discoverd.NewService(svc)
leader, _ := service.Leader()
if leader == nil || leader.Addr == "" {
log.Info("no running leader")
leader = nil
} else {
log.Info("found running leader")
}
instances, _ := service.Instances()
log.Info("found running instances", "count", len(instances))
log.Info("getting sirenia status")
var status *sirenia.Status
if leader != nil && leader.Addr != "" {
client := sirenia.NewClient(leader.Addr)
var err error
status, err = client.Status()
if err != nil {
log.Error("error getting status from leader", "error", err)
}
}
if status != nil && status.Database != nil && status.Database.ReadWrite {
log.Info("cluster claims to be read-write")
return nil
}
log.Info("getting service metadata")
meta, err := discoverd.NewService(svc).GetMeta()
if err != nil {
return fmt.Errorf("error getting sirenia state from discoverd: %s", err)
}
var state state.State
if err := json.Unmarshal(meta.Data, &state); err != nil {
return fmt.Errorf("error decoding state: %s", err)
}
if state.Primary == nil {
return fmt.Errorf("no primary in sirenia state")
}
log.Info("getting primary job info", "job.id", state.Primary.Meta["FLYNN_JOB_ID"])
job, host, err := f.GetJob(state.Primary.Meta["FLYNN_JOB_ID"])
if err != nil {
if state.Sync != nil {
f.l.Error("unable to get primary job info", "error", err)
f.l.Info("getting sync job info", "job.id", state.Sync.Meta["FLYNN_JOB_ID"])
job, host, err = f.GetJob(state.Sync.Meta["FLYNN_JOB_ID"])
if err != nil {
return fmt.Errorf("unable to get primary or sync job details: %s", err)
}
} else {
return fmt.Errorf("unable to get primary job details: %s", err)
}
}
if leader != nil && state.Singleton {
return fmt.Errorf("sirenia leader is running in singleton mode, unable to fix")
}
waitForInstance := func(jobID string) (func() (string, error), error) {
watchCh := make(chan *discoverd.Event)
upCh := make(chan string)
stream, err := service.Watch(watchCh)
if err != nil {
return nil, fmt.Errorf("error watching discoverd service: %s", err)
}
go func() {
var current bool
for event := range watchCh {
if event.Kind == discoverd.EventKindCurrent {
current = true
continue
}
if !current || event.Kind != discoverd.EventKindUp {
continue
}
if event.Instance.Meta["FLYNN_JOB_ID"] == jobID {
upCh <- event.Instance.Addr
}
}
}()
return func() (string, error) {
log.Info("waiting for instance to start", "job.id", jobID)
defer stream.Close()
select {
case addr := <-upCh:
return addr, nil
case <-time.After(time.Minute):
return "", fmt.Errorf("timed out waiting for sirenia instance to come up")
}
}, nil
}
var wait func() (string, error)
have := len(instances)
want := 2
if state.Singleton {
want = 1
}
if have >= want {
return fmt.Errorf("already have enough instances, unable to fix")
}
log.Info("attempting to start missing jobs", "want", want, "have", have)
if leader == nil {
job.ID = cluster.GenerateJobID(host.ID(), "")
f.FixJobEnv(job)
log.Info("starting primary job", "job.id", job.ID)
wait, err = waitForInstance(job.ID)
if err != nil {
return err
}
if err := host.AddJob(job); err != nil {
return fmt.Errorf("error starting primary job on %s: %s", host.ID(), err)
}
have++
}
if want > have {
// if not enough postgres instances, start another
var secondHost *cluster.Host
for _, h := range f.hosts {
if h.ID() != host.ID() {
secondHost = h
break
}
}
if secondHost == nil {
// if there are no other hosts, use the same one we put the primary on
secondHost = host
}
job.ID = cluster.GenerateJobID(secondHost.ID(), "")
f.FixJobEnv(job)
log.Info("starting second job", "job.id", job.ID)
if wait == nil {
wait, err = waitForInstance(job.ID)
if err != nil {
return err
}
}
if err := utils.ProvisionVolume(secondHost, job); err != nil {
return fmt.Errorf("error creating volume on %s: %s", secondHost.ID(), err)
}
if err := secondHost.AddJob(job); err != nil {
return fmt.Errorf("error starting additional job on %s: %s", secondHost.ID(), err)
}
}
if wait != nil {
addr, err := wait()
if err != nil {
return err
}
if leader != nil {
addr = leader.Addr
}
log.Info("waiting for cluster to come up read-write")
return sirenia.NewClient(addr).WaitForReadWrite(5 * time.Minute)
}
return nil
}
func (a *API) scaleUp() error {
a.mtx.Lock()
defer a.mtx.Unlock()
// Ignore if already scaled up.
if a.scaledUp {
return nil
}
app := os.Getenv("FLYNN_APP_ID")
logger := a.logger().New("fn", "scaleUp")
sc := sirenia.NewClient(serviceHost + ":3306")
logger.Info("checking status", "host", serviceHost)
if status, err := sc.Status(); err == nil && status.Database != nil && status.Database.ReadWrite {
logger.Info("database is up, skipping scale")
// Skip the rest, the database is already available
a.scaledUp = true
return nil
} else if err != nil {
logger.Info("error checking status", "err", err)
} else {
logger.Info("got status, but database is not read-write")
}
// Connect to controller.
logger.Info("connecting to controller")
client, err := controller.NewClient("", os.Getenv("CONTROLLER_KEY"))
if err != nil {
logger.Error("controller client error", "err", err)
return err
}
// Retrieve mariadb release.
logger.Info("retrieving app release", "app", app)
release, err := client.GetAppRelease(app)
if err == controller.ErrNotFound {
logger.Error("release not found", "app", app)
return errors.New("mariadb release not found")
} else if err != nil {
logger.Error("get release error", "app", app, "err", err)
return err
}
// Retrieve current formation.
logger.Info("retrieving formation", "app", app, "release_id", release.ID)
formation, err := client.GetFormation(app, release.ID)
if err == controller.ErrNotFound {
logger.Error("formation not found", "app", app, "release_id", release.ID)
return errors.New("mariadb formation not found")
} else if err != nil {
logger.Error("formation error", "app", app, "release_id", release.ID, "err", err)
return err
}
// If mariadb is running then exit.
if formation.Processes["mariadb"] > 0 {
logger.Info("database is running, scaling not necessary")
return nil
}
// Copy processes and increase database processes.
processes := make(map[string]int, len(formation.Processes))
for k, v := range formation.Processes {
processes[k] = v
}
if os.Getenv("SINGLETON") == "true" {
processes["mariadb"] = 1
} else {
processes["mariadb"] = 3
}
// Update formation.
logger.Info("updating formation", "app", app, "release_id", release.ID)
formation.Processes = processes
if err := client.PutFormation(formation); err != nil {
logger.Error("put formation error", "app", app, "release_id", release.ID, "err", err)
return err
}
if err := sc.WaitForReadWrite(5 * time.Minute); err != nil {
logger.Error("wait for read write", "err", err)
return errors.New("timed out while starting mariadb cluster")
}
logger.Info("scaling complete")
// Mark as successfully scaled up.
a.scaledUp = true
return nil
}
func (a *API) ping(ctx context.Context, w http.ResponseWriter, req *http.Request) {
app := os.Getenv("FLYNN_APP_ID")
logger := a.logger().New("fn", "ping")
logger.Info("checking status", "host", serviceHost)
if status, err := sirenia.NewClient(serviceHost + ":3306").Status(); err == nil && status.Database != nil && status.Database.ReadWrite {
logger.Info("database is up, skipping scale check")
} else {
// Connect to controller.
logger.Info("connecting to controller")
client, err := controller.NewClient("", os.Getenv("CONTROLLER_KEY"))
if err != nil {
logger.Error("controller client error", "err", err)
httphelper.Error(w, err)
return
}
// Retrieve mariadb release.
logger.Info("retrieving app release", "app", app)
release, err := client.GetAppRelease(app)
if err == controller.ErrNotFound {
logger.Error("release not found", "app", app)
httphelper.Error(w, err)
return
} else if err != nil {
logger.Error("get release error", "app", app, "err", err)
httphelper.Error(w, err)
return
}
// Retrieve current formation.
logger.Info("retrieving formation", "app", app, "release_id", release.ID)
formation, err := client.GetFormation(app, release.ID)
if err == controller.ErrNotFound {
logger.Error("formation not found", "app", app, "release_id", release.ID)
httphelper.Error(w, err)
return
} else if err != nil {
logger.Error("formation error", "app", app, "release_id", release.ID, "err", err)
httphelper.Error(w, err)
return
}
// MariaDB isn't running, just return healthy
if formation.Processes["mariadb"] == 0 {
w.WriteHeader(200)
return
}
}
db, err := a.connect()
if err != nil {
httphelper.Error(w, err)
return
}
defer db.Close()
if _, err := db.Exec("SELECT 1"); err != nil {
httphelper.Error(w, err)
return
}
w.WriteHeader(200)
}