forked from gravitational/teleport
/
database_watcher.go
188 lines (163 loc) · 5.58 KB
/
database_watcher.go
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/*
* Teleport
* Copyright (C) 2023 Gravitational, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package discovery
import (
"context"
"sync"
"github.com/gravitational/trace"
usageeventsv1 "github.com/gravitational/teleport/api/gen/proto/go/usageevents/v1"
"github.com/gravitational/teleport/api/types"
"github.com/gravitational/teleport/lib/services"
"github.com/gravitational/teleport/lib/srv/discovery/common"
"github.com/gravitational/teleport/lib/utils"
)
const databaseEventPrefix = "db/"
func (s *Server) startDatabaseWatchers() error {
if len(s.databaseFetchers) == 0 && s.dynamicMatcherWatcher == nil {
return nil
}
var (
newDatabases []types.Database
mu sync.Mutex
)
reconciler, err := services.NewReconciler(
services.ReconcilerConfig[types.Database]{
Matcher: func(database types.Database) bool { return true },
GetCurrentResources: s.getCurrentDatabases,
GetNewResources: func() map[string]types.Database {
mu.Lock()
defer mu.Unlock()
return utils.FromSlice(newDatabases, types.Database.GetName)
},
Log: s.Log.WithField("kind", types.KindDatabase),
OnCreate: s.onDatabaseCreate,
OnUpdate: s.onDatabaseUpdate,
OnDelete: s.onDatabaseDelete,
},
)
if err != nil {
return trace.Wrap(err)
}
watcher, err := common.NewWatcher(s.ctx, common.WatcherConfig{
FetchersFn: s.getAllDatabaseFetchers,
Log: s.Log.WithField("kind", types.KindDatabase),
DiscoveryGroup: s.DiscoveryGroup,
Interval: s.PollInterval,
TriggerFetchC: s.newDiscoveryConfigChangedSub(),
Origin: types.OriginCloud,
Clock: s.clock,
})
if err != nil {
return trace.Wrap(err)
}
go watcher.Start()
go func() {
for {
select {
case newResources := <-watcher.ResourcesC():
dbs := make([]types.Database, 0, len(newResources))
for _, r := range newResources {
db, ok := r.(types.Database)
if !ok {
continue
}
dbs = append(dbs, db)
}
mu.Lock()
newDatabases = dbs
mu.Unlock()
if err := reconciler.Reconcile(s.ctx); err != nil {
s.Log.WithError(err).Warn("Unable to reconcile database resources.")
} else if s.onDatabaseReconcile != nil {
s.onDatabaseReconcile()
}
case <-s.ctx.Done():
return
}
}
}()
return nil
}
func (s *Server) getAllDatabaseFetchers() []common.Fetcher {
allFetchers := make([]common.Fetcher, 0, len(s.databaseFetchers))
s.muDynamicDatabaseFetchers.RLock()
for _, fetcherSet := range s.dynamicDatabaseFetchers {
allFetchers = append(allFetchers, fetcherSet...)
}
s.muDynamicDatabaseFetchers.RUnlock()
allFetchers = append(allFetchers, s.databaseFetchers...)
s.submitFetchersEvent(allFetchers)
return allFetchers
}
func (s *Server) getCurrentDatabases() map[string]types.Database {
databases, err := s.AccessPoint.GetDatabases(s.ctx)
if err != nil {
s.Log.WithError(err).Warn("Failed to get databases from cache.")
return nil
}
return utils.FromSlice[types.Database](filterResources(databases, types.OriginCloud, s.DiscoveryGroup), func(database types.Database) string {
return database.GetName()
})
}
func (s *Server) onDatabaseCreate(ctx context.Context, database types.Database) error {
s.Log.Debugf("Creating database %s.", database.GetName())
err := s.AccessPoint.CreateDatabase(ctx, database)
// If the database already exists but has an empty discovery group, update it.
if trace.IsAlreadyExists(err) && s.updatesEmptyDiscoveryGroup(
func() (types.ResourceWithLabels, error) {
return s.AccessPoint.GetDatabase(ctx, database.GetName())
}) {
return trace.Wrap(s.onDatabaseUpdate(ctx, database, nil))
}
if err != nil {
return trace.Wrap(err)
}
err = s.emitUsageEvents(map[string]*usageeventsv1.ResourceCreateEvent{
databaseEventPrefix + database.GetName(): {
ResourceType: types.DiscoveredResourceDatabase,
ResourceOrigin: types.OriginCloud,
CloudProvider: database.GetCloud(),
Database: &usageeventsv1.DiscoveredDatabaseMetadata{
DbType: database.GetType(),
DbProtocol: database.GetProtocol(),
},
},
})
if err != nil {
s.Log.WithError(err).Debug("Error emitting usage event.")
}
return nil
}
func (s *Server) onDatabaseUpdate(ctx context.Context, database, _ types.Database) error {
s.Log.Debugf("Updating database %s.", database.GetName())
return trace.Wrap(s.AccessPoint.UpdateDatabase(ctx, database))
}
func (s *Server) onDatabaseDelete(ctx context.Context, database types.Database) error {
s.Log.Debugf("Deleting database %s.", database.GetName())
return trace.Wrap(s.AccessPoint.DeleteDatabase(ctx, database.GetName()))
}
func filterResources[T types.ResourceWithLabels, S ~[]T](all S, wantOrigin, wantResourceGroup string) (filtered S) {
for _, resource := range all {
resourceDiscoveryGroup, _ := resource.GetLabel(types.TeleportInternalDiscoveryGroupName)
if (wantOrigin != "" && resource.Origin() != wantOrigin) || resourceDiscoveryGroup != wantResourceGroup {
continue
}
filtered = append(filtered, resource)
}
return
}