agola/internal/services/runservice/runservice.go

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// Copyright 2019 Sorint.lab
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
// See the License for the specific language governing permissions and
// limitations under the License.
package runservice
import (
"context"
"crypto/tls"
"net/http"
"path/filepath"
"sync"
"time"
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scommon "agola.io/agola/internal/common"
"agola.io/agola/internal/datamanager"
"agola.io/agola/internal/etcd"
"agola.io/agola/internal/objectstorage"
"agola.io/agola/internal/services/config"
"agola.io/agola/internal/services/runservice/action"
"agola.io/agola/internal/services/runservice/api"
"agola.io/agola/internal/services/runservice/common"
"agola.io/agola/internal/services/runservice/readdb"
"agola.io/agola/internal/services/runservice/types"
"agola.io/agola/internal/util"
"github.com/gorilla/mux"
etcdclientv3 "go.etcd.io/etcd/clientv3"
"go.etcd.io/etcd/mvcc/mvccpb"
"go.uber.org/zap/zapcore"
)
// etcdPingerLoop periodically updates a key.
// This is used by watchers to inform the client of the current revision
// this is needed since if other users are updating other unwatched keys on
// etcd we won't be notified, not updating the known revisions
// TODO(sgotti) use upcoming etcd 3.4 watch RequestProgress???
func (s *Runservice) etcdPingerLoop(ctx context.Context) {
for {
if err := s.etcdPinger(ctx); err != nil {
log.Errorf("err: %+v", err)
}
sleepCh := time.NewTimer(1 * time.Second).C
select {
case <-ctx.Done():
return
case <-sleepCh:
}
}
}
func (s *Runservice) etcdPinger(ctx context.Context) error {
if _, err := s.e.Put(ctx, common.EtcdPingKey, []byte{}, nil); err != nil {
return err
}
return nil
}
func (s *Runservice) maintenanceModeWatcherLoop(ctx context.Context, runCtxCancel context.CancelFunc, maintenanceModeEnabled bool) {
for {
log.Debugf("maintenanceModeWatcherLoop")
// at first watch restart from previous processed revision
if err := s.maintenanceModeWatcher(ctx, runCtxCancel, maintenanceModeEnabled); err != nil {
log.Errorf("err: %+v", err)
}
sleepCh := time.NewTimer(1 * time.Second).C
select {
case <-ctx.Done():
return
case <-sleepCh:
}
}
}
func (s *Runservice) maintenanceModeWatcher(ctx context.Context, runCtxCancel context.CancelFunc, maintenanceModeEnabled bool) error {
log.Infof("watcher: maintenance mode enabled: %t", maintenanceModeEnabled)
resp, err := s.e.Get(ctx, common.EtcdMaintenanceKey, 0)
if err != nil && err != etcd.ErrKeyNotFound {
return err
}
if len(resp.Kvs) > 0 {
log.Infof("maintenance mode key is present")
if !maintenanceModeEnabled {
runCtxCancel()
}
}
revision := resp.Header.Revision
wctx := etcdclientv3.WithRequireLeader(ctx)
// restart from previous processed revision
wch := s.e.Watch(wctx, common.EtcdMaintenanceKey, revision)
for wresp := range wch {
if wresp.Canceled {
return wresp.Err()
}
for _, ev := range wresp.Events {
switch ev.Type {
case mvccpb.PUT:
log.Infof("maintenance mode key set")
if !maintenanceModeEnabled {
runCtxCancel()
}
case mvccpb.DELETE:
log.Infof("maintenance mode key removed")
if maintenanceModeEnabled {
runCtxCancel()
}
}
}
}
return nil
}
type Runservice struct {
c *config.Runservice
e *etcd.Store
ost *objectstorage.ObjStorage
dm *datamanager.DataManager
readDB *readdb.ReadDB
ah *action.ActionHandler
maintenanceMode bool
}
func NewRunservice(ctx context.Context, c *config.Runservice) (*Runservice, error) {
if c.Debug {
level.SetLevel(zapcore.DebugLevel)
}
ost, err := scommon.NewObjectStorage(&c.ObjectStorage)
if err != nil {
return nil, err
}
e, err := scommon.NewEtcd(&c.Etcd, logger, "runservice")
if err != nil {
return nil, err
}
s := &Runservice{
c: c,
e: e,
ost: ost,
}
dmConf := &datamanager.DataManagerConfig{
BasePath: "rundata",
E: e,
OST: ost,
DataTypes: []string{
string(common.DataTypeRun),
string(common.DataTypeRunConfig),
string(common.DataTypeRunCounter),
},
}
dm, err := datamanager.NewDataManager(ctx, logger, dmConf)
if err != nil {
return nil, err
}
s.dm = dm
readDB, err := readdb.NewReadDB(ctx, logger, filepath.Join(c.DataDir, "readdb"), e, ost, dm)
if err != nil {
return nil, err
}
s.readDB = readDB
ah := action.NewActionHandler(logger, e, readDB, ost, dm)
s.ah = ah
return s, nil
}
func (s *Runservice) InitEtcd(ctx context.Context) error {
// Create changegroup min revision if it doesn't exists
cmp := []etcdclientv3.Cmp{}
then := []etcdclientv3.Op{}
cmp = append(cmp, etcdclientv3.Compare(etcdclientv3.CreateRevision(common.EtcdChangeGroupMinRevisionKey), "=", 0))
then = append(then, etcdclientv3.OpPut(common.EtcdChangeGroupMinRevisionKey, ""))
txn := s.e.Client().Txn(ctx).If(cmp...).Then(then...)
if _, err := txn.Commit(); err != nil {
return etcd.FromEtcdError(err)
}
return nil
}
func (s *Runservice) setupDefaultRouter(etCh chan *types.ExecutorTask) http.Handler {
maintenanceModeHandler := api.NewMaintenanceModeHandler(logger, s.ah, s.e)
exportHandler := api.NewExportHandler(logger, s.ah)
// executor dedicated api, only calls from executor should happen on these handlers
executorStatusHandler := api.NewExecutorStatusHandler(logger, s.e, s.ah)
executorTaskStatusHandler := api.NewExecutorTaskStatusHandler(s.e, etCh)
executorTaskHandler := api.NewExecutorTaskHandler(s.e)
executorTasksHandler := api.NewExecutorTasksHandler(s.e)
archivesHandler := api.NewArchivesHandler(logger, s.ost)
cacheHandler := api.NewCacheHandler(logger, s.ost)
cacheCreateHandler := api.NewCacheCreateHandler(logger, s.ost)
// api from clients
executorDeleteHandler := api.NewExecutorDeleteHandler(logger, s.ah)
logsHandler := api.NewLogsHandler(logger, s.e, s.ost, s.dm)
runHandler := api.NewRunHandler(logger, s.e, s.dm, s.readDB)
runTaskActionsHandler := api.NewRunTaskActionsHandler(logger, s.ah)
runsHandler := api.NewRunsHandler(logger, s.readDB)
runActionsHandler := api.NewRunActionsHandler(logger, s.ah)
runCreateHandler := api.NewRunCreateHandler(logger, s.ah)
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runEventsHandler := api.NewRunEventsHandler(logger, s.e, s.ost, s.dm)
changeGroupsUpdateTokensHandler := api.NewChangeGroupsUpdateTokensHandler(logger, s.readDB)
router := mux.NewRouter()
apirouter := router.PathPrefix("/api/v1alpha").Subrouter()
// don't return 404 on a call to an undefined handler but 400 to distinguish between a non existent resource and a wrong method
apirouter.NotFoundHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusBadRequest) })
apirouter.Handle("/executor/{executorid}", executorStatusHandler).Methods("POST")
apirouter.Handle("/executor/{executorid}", executorDeleteHandler).Methods("DELETE")
apirouter.Handle("/executor/{executorid}/tasks", executorTasksHandler).Methods("GET")
apirouter.Handle("/executor/{executorid}/tasks/{taskid}", executorTaskHandler).Methods("GET")
apirouter.Handle("/executor/{executorid}/tasks/{taskid}", executorTaskStatusHandler).Methods("POST")
apirouter.Handle("/executor/archives", archivesHandler).Methods("GET")
apirouter.Handle("/executor/caches/{key}", cacheHandler).Methods("HEAD")
apirouter.Handle("/executor/caches/{key}", cacheHandler).Methods("GET")
apirouter.Handle("/executor/caches/{key}", cacheCreateHandler).Methods("POST")
apirouter.Handle("/logs", logsHandler).Methods("GET")
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apirouter.Handle("/runs/events", runEventsHandler).Methods("GET")
apirouter.Handle("/runs/{runid}", runHandler).Methods("GET")
apirouter.Handle("/runs/{runid}/actions", runActionsHandler).Methods("PUT")
apirouter.Handle("/runs/{runid}/tasks/{taskid}/actions", runTaskActionsHandler).Methods("PUT")
apirouter.Handle("/runs", runsHandler).Methods("GET")
apirouter.Handle("/runs", runCreateHandler).Methods("POST")
apirouter.Handle("/changegroups", changeGroupsUpdateTokensHandler).Methods("GET")
apirouter.Handle("/maintenance", maintenanceModeHandler).Methods("PUT", "DELETE")
apirouter.Handle("/export", exportHandler).Methods("GET")
mainrouter := mux.NewRouter()
mainrouter.PathPrefix("/").Handler(router)
// Return a bad request when it doesn't match any route
mainrouter.NotFoundHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusBadRequest) })
return mainrouter
}
func (s *Runservice) setupMaintenanceRouter() http.Handler {
maintenanceModeHandler := api.NewMaintenanceModeHandler(logger, s.ah, s.e)
exportHandler := api.NewExportHandler(logger, s.ah)
importHandler := api.NewImportHandler(logger, s.ah)
router := mux.NewRouter()
apirouter := router.PathPrefix("/api/v1alpha").Subrouter().UseEncodedPath()
apirouter.Handle("/maintenance", maintenanceModeHandler).Methods("PUT", "DELETE")
apirouter.Handle("/export", exportHandler).Methods("GET")
apirouter.Handle("/import", importHandler).Methods("POST")
mainrouter := mux.NewRouter()
mainrouter.PathPrefix("/").Handler(router)
return mainrouter
}
func (s *Runservice) Run(ctx context.Context) error {
for {
if err := s.run(ctx); err != nil {
log.Errorf("run error: %+v", err)
}
sleepCh := time.NewTimer(1 * time.Second).C
select {
case <-ctx.Done():
log.Infof("runservice exiting")
return nil
case <-sleepCh:
}
}
}
func (s *Runservice) run(ctx context.Context) error {
var tlsConfig *tls.Config
if s.c.Web.TLS {
var err error
tlsConfig, err = util.NewTLSConfig(s.c.Web.TLSCertFile, s.c.Web.TLSKeyFile, "", false)
if err != nil {
log.Errorf("err: %+v")
return err
}
}
resp, err := s.e.Get(ctx, common.EtcdMaintenanceKey, 0)
if err != nil && err != etcd.ErrKeyNotFound {
return err
}
maintenanceMode := false
if len(resp.Kvs) > 0 {
log.Infof("maintenance mode key is present")
maintenanceMode = true
}
s.maintenanceMode = maintenanceMode
s.dm.SetMaintenanceMode(maintenanceMode)
s.ah.SetMaintenanceMode(maintenanceMode)
ctx, cancel := context.WithCancel(ctx)
errCh := make(chan error, 100)
var wg sync.WaitGroup
dmReadyCh := make(chan struct{})
var mainrouter http.Handler
if s.maintenanceMode {
mainrouter = s.setupMaintenanceRouter()
util.GoWait(&wg, func() { s.maintenanceModeWatcherLoop(ctx, cancel, s.maintenanceMode) })
} else {
ch := make(chan *types.ExecutorTask)
mainrouter = s.setupDefaultRouter(ch)
util.GoWait(&wg, func() { s.maintenanceModeWatcherLoop(ctx, cancel, s.maintenanceMode) })
// TODO(sgotti) wait for all goroutines exiting
util.GoWait(&wg, func() { errCh <- s.dm.Run(ctx, dmReadyCh) })
// wait for dm to be ready
<-dmReadyCh
for {
err := s.InitEtcd(ctx)
if err == nil {
break
}
log.Errorf("failed to initialize etcd: %+v", err)
sleepCh := time.NewTimer(1 * time.Second).C
select {
case <-ctx.Done():
return nil
case <-sleepCh:
}
}
util.GoWait(&wg, func() { errCh <- s.readDB.Run(ctx) })
util.GoWait(&wg, func() { s.executorTasksCleanerLoop(ctx) })
util.GoWait(&wg, func() { s.runsSchedulerLoop(ctx) })
util.GoWait(&wg, func() { s.runTasksUpdaterLoop(ctx) })
util.GoWait(&wg, func() { s.fetcherLoop(ctx) })
util.GoWait(&wg, func() { s.finishedRunsArchiverLoop(ctx) })
util.GoWait(&wg, func() { s.compactChangeGroupsLoop(ctx) })
util.GoWait(&wg, func() { s.cacheCleanerLoop(ctx, s.c.RunCacheExpireInterval) })
util.GoWait(&wg, func() { s.executorTaskUpdateHandler(ctx, ch) })
util.GoWait(&wg, func() { s.etcdPingerLoop(ctx) })
}
httpServer := http.Server{
Addr: s.c.Web.ListenAddress,
Handler: mainrouter,
TLSConfig: tlsConfig,
}
lerrCh := make(chan error, 1)
util.GoWait(&wg, func() {
lerrCh <- httpServer.ListenAndServe()
})
select {
case <-ctx.Done():
log.Infof("runservice run exiting")
case err = <-lerrCh:
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if err != nil {
log.Errorf("http server listen error: %v", err)
}
case err := <-errCh:
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if err != nil {
log.Errorf("error: %+v", err)
}
}
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cancel()
httpServer.Close()
wg.Wait()
return err
}