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package icingadb
import (
"context"
"fmt"
"github.com/icinga/icingadb/pkg/com"
"github.com/icinga/icingadb/pkg/common"
"github.com/icinga/icingadb/pkg/contracts"
v1 "github.com/icinga/icingadb/pkg/icingadb/v1"
"github.com/icinga/icingadb/pkg/icingaredis"
"github.com/icinga/icingadb/pkg/icingaredis/telemetry"
"github.com/icinga/icingadb/pkg/logging"
"github.com/icinga/icingadb/pkg/utils"
"github.com/pkg/errors"
"go.uber.org/zap"
"golang.org/x/sync/errgroup"
"runtime"
"time"
)
// Sync implements a rendezvous point for Icinga DB and Redis to synchronize their entities.
type Sync struct {
db *DB
redis *icingaredis.Client
logger *logging.Logger
}
// NewSync returns a new Sync.
func NewSync(db *DB, redis *icingaredis.Client, logger *logging.Logger) *Sync {
return &Sync{
db: db,
redis: redis,
logger: logger,
}
}
// SyncAfterDump waits for a config dump to finish (using the dump parameter) and then starts a sync for the given
// sync subject using the Sync function.
func (s Sync) SyncAfterDump(ctx context.Context, subject *common.SyncSubject, dump *DumpSignals) error {
typeName := utils.Name(subject.Entity())
key := "icinga:" + utils.Key(typeName, ':')
startTime := time.Now()
logTicker := time.NewTicker(s.logger.Interval())
defer logTicker.Stop()
loggedWaiting := false
for {
select {
case <-logTicker.C:
s.logger.Infow("Waiting for dump done signal",
zap.String("type", typeName),
zap.String("key", key),
zap.Duration("duration", time.Since(startTime)))
loggedWaiting = true
case <-dump.Done(key):
logFn := s.logger.Debugw
if loggedWaiting {
logFn = s.logger.Infow
}
logFn("Starting sync",
zap.String("type", typeName),
zap.String("key", key),
zap.Duration("waited", time.Since(startTime)))
return s.Sync(ctx, subject)
case <-ctx.Done():
return ctx.Err()
}
}
}
// Sync synchronizes entities between Icinga DB and Redis created with the specified sync subject.
// This function does not respect dump signals. For this, use SyncAfterDump.
func (s Sync) Sync(ctx context.Context, subject *common.SyncSubject) error {
g, ctx := errgroup.WithContext(ctx)
desired, redisErrs := s.redis.YieldAll(ctx, subject)
// Let errors from Redis cancel our group.
com.ErrgroupReceive(g, redisErrs)
e, ok := v1.EnvironmentFromContext(ctx)
if !ok {
return errors.New("can't get environment from context")
}
actual, dbErrs := s.db.YieldAll(
ctx, subject.FactoryForDelta(),
s.db.BuildSelectStmt(NewScopedEntity(subject.Entity(), e.Meta()), subject.Entity().Fingerprint()), e.Meta(),
)
// Let errors from DB cancel our group.
com.ErrgroupReceive(g, dbErrs)
g.Go(func() error {
return s.ApplyDelta(ctx, NewDelta(ctx, actual, desired, subject, s.logger))
})
return g.Wait()
}
// ApplyDelta applies all changes from Delta to the database.
func (s Sync) ApplyDelta(ctx context.Context, delta *Delta) error {
if err := delta.Wait(); err != nil {
return errors.Wrap(err, "can't calculate delta")
}
g, ctx := errgroup.WithContext(ctx)
stat := getCounterForEntity(delta.Subject.Entity())
// Create
if len(delta.Create) > 0 {
s.logger.Infof("Inserting %d items of type %s", len(delta.Create), utils.Key(utils.Name(delta.Subject.Entity()), ' '))
var entities <-chan contracts.Entity
if delta.Subject.WithChecksum() {
pairs, errs := s.redis.HMYield(
ctx,
fmt.Sprintf("icinga:%s", utils.Key(utils.Name(delta.Subject.Entity()), ':')),
delta.Create.Keys()...)
// Let errors from Redis cancel our group.
com.ErrgroupReceive(g, errs)
entitiesWithoutChecksum, errs := icingaredis.CreateEntities(ctx, delta.Subject.Factory(), pairs, runtime.NumCPU())
// Let errors from CreateEntities cancel our group.
com.ErrgroupReceive(g, errs)
entities, errs = icingaredis.SetChecksums(ctx, entitiesWithoutChecksum, delta.Create, runtime.NumCPU())
// Let errors from SetChecksums cancel our group.
com.ErrgroupReceive(g, errs)
} else {
entities = delta.Create.Entities(ctx)
}
g.Go(func() error {
return s.db.CreateStreamed(ctx, entities, OnSuccessIncrement[contracts.Entity](stat))
})
}
// Update
if len(delta.Update) > 0 {
s.logger.Infof("Updating %d items of type %s", len(delta.Update), utils.Key(utils.Name(delta.Subject.Entity()), ' '))
pairs, errs := s.redis.HMYield(
ctx,
fmt.Sprintf("icinga:%s", utils.Key(utils.Name(delta.Subject.Entity()), ':')),
delta.Update.Keys()...)
// Let errors from Redis cancel our group.
com.ErrgroupReceive(g, errs)
entitiesWithoutChecksum, errs := icingaredis.CreateEntities(ctx, delta.Subject.Factory(), pairs, runtime.NumCPU())
// Let errors from CreateEntities cancel our group.
com.ErrgroupReceive(g, errs)
entities, errs := icingaredis.SetChecksums(ctx, entitiesWithoutChecksum, delta.Update, runtime.NumCPU())
// Let errors from SetChecksums cancel our group.
com.ErrgroupReceive(g, errs)
g.Go(func() error {
// Using upsert here on purpose as this is the fastest way to do bulk updates.
// However, there is a risk that errors in the sync implementation could silently insert new rows.
return s.db.UpsertStreamed(ctx, entities, OnSuccessIncrement[contracts.Entity](stat))
})
}
// Delete
if len(delta.Delete) > 0 {
s.logger.Infof("Deleting %d items of type %s", len(delta.Delete), utils.Key(utils.Name(delta.Subject.Entity()), ' '))
g.Go(func() error {
return s.db.Delete(ctx, delta.Subject.Entity(), delta.Delete.IDs(), OnSuccessIncrement[any](stat))
})
}
return g.Wait()
}
// SyncCustomvars synchronizes customvar and customvar_flat.
func (s Sync) SyncCustomvars(ctx context.Context) error {
e, ok := v1.EnvironmentFromContext(ctx)
if !ok {
return errors.New("can't get environment from context")
}
g, ctx := errgroup.WithContext(ctx)
cv := common.NewSyncSubject(v1.NewCustomvar)
cvs, errs := s.redis.YieldAll(ctx, cv)
com.ErrgroupReceive(g, errs)
desiredCvs, desiredFlatCvs, errs := v1.ExpandCustomvars(ctx, cvs)
com.ErrgroupReceive(g, errs)
actualCvs, errs := s.db.YieldAll(
ctx, cv.FactoryForDelta(),
s.db.BuildSelectStmt(NewScopedEntity(cv.Entity(), e.Meta()), cv.Entity().Fingerprint()), e.Meta(),
)
com.ErrgroupReceive(g, errs)
g.Go(func() error {
return s.ApplyDelta(ctx, NewDelta(ctx, actualCvs, desiredCvs, cv, s.logger))
})
flatCv := common.NewSyncSubject(v1.NewCustomvarFlat)
actualFlatCvs, errs := s.db.YieldAll(
ctx, flatCv.FactoryForDelta(),
s.db.BuildSelectStmt(NewScopedEntity(flatCv.Entity(), e.Meta()), flatCv.Entity().Fingerprint()), e.Meta(),
)
com.ErrgroupReceive(g, errs)
g.Go(func() error {
return s.ApplyDelta(ctx, NewDelta(ctx, actualFlatCvs, desiredFlatCvs, flatCv, s.logger))
})
return g.Wait()
}
// getCounterForEntity returns the appropriate counter (config/state) from telemetry.Stats for e.
func getCounterForEntity(e contracts.Entity) *com.Counter {
switch e.(type) {
case *v1.HostState, *v1.ServiceState:
return &telemetry.Stats.State
default:
return &telemetry.Stats.Config
}
}
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