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domain_migration.go
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domain_migration.go
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package domain_migration
import (
"encoding/json"
"errors"
"fmt"
"strings"
"time"
"github.com/flynn/flynn/controller/client"
ct "github.com/flynn/flynn/controller/types"
"github.com/flynn/flynn/controller/worker/types"
"github.com/flynn/flynn/pkg/postgres"
"github.com/flynn/flynn/pkg/tlscert"
routerc "github.com/flynn/flynn/router/client"
"github.com/flynn/flynn/router/types"
"github.com/flynn/que-go"
"gopkg.in/inconshreveable/log15.v2"
)
// limits the number of concurrent requests to the router
const maxActiveRouteUpdates = 5
type context struct {
db *postgres.DB
client controller.Client
logger log15.Logger
}
type migration struct {
db *postgres.DB
client controller.Client
rc routerc.Client
logger log15.Logger
dm *ct.DomainMigration
activeRouteUpdates chan struct{}
stop chan struct{}
}
func JobHandler(db *postgres.DB, client controller.Client, logger log15.Logger) func(*que.Job) error {
return (&context{db, client, logger}).HandleDomainMigration
}
func deployTimeout() <-chan struct{} {
ch := make(chan struct{})
time.AfterFunc(5*time.Minute, func() { close(ch) })
return ch
}
func (c *context) HandleDomainMigration(job *que.Job) (err error) {
log := c.logger.New("fn", "HandleDomainMigration")
log.Info("handling domain migration", "job_id", job.ID, "error_count", job.ErrorCount)
var dm *ct.DomainMigration
if err := json.Unmarshal(job.Args, &dm); err != nil {
log.Error("error unmarshaling job", "err", err)
return err
}
log = log.New("domain_migration", dm.ID)
m := &migration{
db: c.db,
client: c.client,
rc: routerc.New(),
logger: log,
dm: dm,
activeRouteUpdates: make(chan struct{}, maxActiveRouteUpdates),
stop: job.Stop,
}
if err := m.db.QueryRow("SELECT old_domain, domain, old_tls_cert, tls_cert, created_at, finished_at FROM domain_migrations WHERE migration_id = $1", dm.ID).Scan(&dm.OldDomain, &dm.Domain, &dm.OldTLSCert, &dm.TLSCert, &dm.CreatedAt, &dm.FinishedAt); err != nil {
log.Error("error fetching postgres record", "err", err)
m.createEvent(err)
return err
}
if dm.FinishedAt != nil {
// Already done
return nil
}
return m.Run()
}
func (m *migration) Run() error {
log := m.logger
dm := m.dm
// Generate TLS Cert if not already present
var cert *tlscert.Cert
if dm.TLSCert == nil {
var err error
cert, err = m.generateTLSCert()
if err != nil {
log.Error("error generating TLS cert", "err", err)
m.createEvent(err)
return err
}
dm.TLSCert = cert
}
if err := m.maybeDeployController(); err != nil {
log.Error("error deploying controller", "err", err)
m.createEvent(err)
return err
}
if err := m.maybeDeployRouter(); err != nil {
log.Error("error deploying router", "err", err)
m.createEvent(err)
return err
}
if err := m.maybeDeployDashboard(); err != nil {
log.Error("error deploying dashboard", "err", err)
m.createEvent(err)
return err
}
if err := m.createMissingRoutes(); err != nil {
log.Error("error creating missing routes", "err", err)
m.createEvent(err)
return err
}
if err := m.db.QueryRow("UPDATE domain_migrations SET finished_at = now() RETURNING finished_at").Scan(&dm.FinishedAt); err != nil {
log.Error("error setting finished_at", "err", err)
m.createEvent(err)
return err
}
log.Info("domain migration complete")
m.createEvent(nil)
return nil
}
func (m *migration) generateTLSCert() (*tlscert.Cert, error) {
hosts := []string{
m.dm.Domain,
fmt.Sprintf("*.%s", m.dm.Domain),
}
cert, err := tlscert.Generate(hosts)
if err != nil {
return nil, err
}
if _, err := m.db.Query("UPDATE domain_migrations SET tls_cert = $1 WHERE migration_id = $2", cert, m.dm.ID); err != nil {
return nil, err
}
return cert, nil
}
func dupRelease(release *ct.Release) *ct.Release {
return &ct.Release{
ArtifactIDs: release.ArtifactIDs,
Env: release.Env,
Meta: release.Meta,
Processes: release.Processes,
}
}
func (m *migration) waitForDeployment(app string) error {
list, err := m.client.DeploymentList(app)
if err != nil || len(list) == 0 {
return err
}
d := list[0]
if d.Status != "pending" && d.Status != "running" {
return nil
}
events := make(chan *ct.Event)
stream, err := m.client.StreamEvents(ct.StreamEventsOptions{
AppID: d.AppID,
ObjectID: d.ID,
ObjectTypes: []ct.EventType{ct.EventTypeDeployment},
}, events)
if err != nil {
return err
}
defer stream.Close()
log := m.logger.New("app.name", app, "deployment", d.ID)
log.Info("waiting for deployment")
timeout := time.After(2 * time.Minute)
for {
select {
case event := <-events:
var data *ct.DeploymentEvent
if err := json.Unmarshal(event.Data, &data); err != nil {
return err
}
if data.Status == "complete" {
log.Info("deployment complete")
return nil
}
if data.Status == "failed" {
log.Error("deployment failed", "error", data.Error)
return errors.New(data.Error)
}
case <-timeout:
err := errors.New("timed out waiting for deployment")
log.Error(err.Error())
return err
case <-m.stop:
return worker.ErrStopped
}
}
}
func (m *migration) maybeDeployController() error {
const appName = "controller"
log := m.logger.New("app.name", appName)
if err := m.waitForDeployment(appName); err != nil {
return err
}
release, err := m.client.GetAppRelease(appName)
if err != nil {
log.Error("error fetching release", "error", err)
return err
}
if release.Env["DEFAULT_ROUTE_DOMAIN"] != m.dm.OldDomain {
log.Info("already migrated")
return nil
}
release = dupRelease(release)
release.Env["DEFAULT_ROUTE_DOMAIN"] = m.dm.Domain
release.Env["CA_CERT"] = m.dm.TLSCert.CACert
if err := m.client.CreateRelease(release); err != nil {
log.Error("error creating release", "error", err)
return err
}
if err := m.client.DeployAppRelease(appName, release.ID, deployTimeout()); err != nil {
log.Error("error deploying release", "error", err)
return err
}
return nil
}
func (m *migration) maybeDeployRouter() error {
const appName = "router"
log := m.logger.New("app.name", appName)
if err := m.waitForDeployment(appName); err != nil {
return err
}
release, err := m.client.GetAppRelease(appName)
if err != nil {
log.Error("error fetching release", "error", err)
return err
}
if release.Env["TLSCERT"] != m.dm.OldTLSCert.Cert {
log.Info("already migrated")
return nil
}
release = dupRelease(release)
release.Env["TLSCERT"] = m.dm.TLSCert.Cert
release.Env["TLSKEY"] = m.dm.TLSCert.PrivateKey
if err := m.client.CreateRelease(release); err != nil {
log.Error("error creating release", "error", err)
return err
}
if err := m.client.DeployAppRelease(appName, release.ID, deployTimeout()); err != nil {
log.Error("error deploying release", "error", err)
return err
}
return nil
}
func (m *migration) maybeDeployDashboard() error {
const appName = "dashboard"
log := m.logger.New("app.name", appName)
if err := m.waitForDeployment(appName); err != nil {
return err
}
release, err := m.client.GetAppRelease(appName)
if err != nil {
log.Error("error fetching release", "error", err)
return err
}
if release.Env["DEFAULT_ROUTE_DOMAIN"] != m.dm.OldDomain {
log.Info("already migrated")
return nil
}
release = dupRelease(release)
release.Env["CA_CERT"] = m.dm.TLSCert.CACert
release.Env["DEFAULT_ROUTE_DOMAIN"] = m.dm.Domain
release.Env["CONTROLLER_DOMAIN"] = fmt.Sprintf("controller.%s", m.dm.Domain)
release.Env["URL"] = fmt.Sprintf("https://dashboard.%s", m.dm.Domain)
if err := m.client.CreateRelease(release); err != nil {
log.Error("error creating release", "error", err)
return err
}
if err := m.client.DeployAppRelease(appName, release.ID, deployTimeout()); err != nil {
log.Error("error deploying release", "error", err)
return err
}
return nil
}
func (m *migration) createMissingRoutes() error {
// Get list of all routes from router
routes, err := m.rc.ListRoutes("")
if err != nil {
return err
}
apps, err := m.client.AppList()
if err != nil {
return err
}
// Index routes by appID
appRoutes := make(map[string][]*router.Route, len(apps))
for _, r := range routes {
if !strings.HasPrefix(r.ParentRef, ct.RouteParentRefPrefix) {
continue
}
appID := strings.TrimPrefix(r.ParentRef, ct.RouteParentRefPrefix)
if appRoutes[appID] == nil {
appRoutes[appID] = make([]*router.Route, 0, 1)
}
appRoutes[appID] = append(appRoutes[appID], r)
}
errChan := make(chan error, len(apps))
createMissingRoutes := func(app *ct.App) {
errChan <- m.appCreateMissingRoutes(app.ID, appRoutes[app.ID])
}
for _, app := range apps {
go createMissingRoutes(app)
}
var returnErr error
for range apps {
if err := <-errChan; err != nil && returnErr == nil {
returnErr = err
}
}
return returnErr
}
func (m *migration) appCreateMissingRoutes(appID string, routes []*router.Route) error {
if routes == nil {
// There are no routes for this app
return nil
}
m.activeRouteUpdates <- struct{}{}
for _, route := range routes {
if route.Type != "http" {
continue
}
if strings.HasSuffix(route.Domain, m.dm.OldDomain) {
if err := m.appMaybeCreateRoute(appID, route, routes); err != nil {
return err
}
}
}
<-m.activeRouteUpdates
return nil
}
func (m *migration) appMaybeCreateRoute(appID string, oldRoute *router.Route, routes []*router.Route) error {
prefix := strings.TrimSuffix(oldRoute.Domain, m.dm.OldDomain)
for _, route := range routes {
if strings.HasPrefix(route.Domain, prefix) && strings.HasSuffix(route.Domain, m.dm.Domain) {
// Route already exists
return nil
}
}
route := &router.Route{
Type: "http",
Domain: strings.Join([]string{prefix, m.dm.Domain}, ""),
Sticky: oldRoute.Sticky,
Service: oldRoute.Service,
}
if oldRoute.Certificate != nil && oldRoute.Certificate.Cert == strings.TrimSpace(m.dm.OldTLSCert.Cert) {
route.Certificate = &router.Certificate{
Cert: m.dm.TLSCert.Cert,
Key: m.dm.TLSCert.PrivateKey,
}
} else {
route.Certificate = oldRoute.Certificate
}
err := m.client.CreateRoute(appID, route)
if err != nil && err.Error() == "conflict: Duplicate route" {
return nil
}
return err
}
func (m *migration) createEvent(err error) error {
e := ct.DomainMigrationEvent{DomainMigration: m.dm}
if err != nil {
e.Error = err.Error()
}
query := "INSERT INTO events (object_id, object_type, data) VALUES ($1, $2, $3)"
return m.db.Exec(query, m.dm.ID, string(ct.EventTypeDomainMigration), e)
}