ziti/controller/model/command.go

/*
	Copyright NetFoundry Inc.

	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

	https://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 model

import (
	"errors"
	"runtime/debug"
	"time"

	"github.com/michaelquigley/pfxlog"
	"github.com/openziti/foundation/v2/goroutines"
	"github.com/openziti/metrics"
	"github.com/openziti/ziti/v2/common/pb/cmd_pb"
	"github.com/openziti/ziti/v2/common/servermetrics"
	"github.com/openziti/ziti/v2/controller/change"
	"github.com/openziti/ziti/v2/controller/command"
	"github.com/openziti/ziti/v2/controller/fields"
	"github.com/openziti/ziti/v2/controller/idgen"
	"github.com/openziti/ziti/v2/controller/ioc"
	"github.com/openziti/ziti/v2/controller/models"
	"github.com/sirupsen/logrus"
	"google.golang.org/protobuf/proto"
)

const (
	backgroundQueueMetricsBase    = "command.background"
	backgroundQueueDroppedEntries = backgroundQueueMetricsBase + ".dropped_entries"
)

func newCommandManager(env Env, registry ioc.Registry) *CommandManager {
	result := &CommandManager{
		env:                      env,
		registry:                 registry,
		Decoders:                 env.GetCommandDispatcher().GetDecoders(),
		backgroundDelayThreshold: env.GetConfig().Command.Background.DelayThreshold,
		backgroundWorkTimer:      env.GetMetricsRegistry().Timer(backgroundQueueMetricsBase + ".work_timer"),
	}

	if env.GetConfig().Command.Background.Enabled {
		poolConfig := goroutines.PoolConfig{
			QueueSize:   env.GetConfig().Command.Background.QueueSize,
			MinWorkers:  0,
			MaxWorkers:  1,
			IdleTime:    5 * time.Second,
			CloseNotify: env.GetCloseNotifyChannel(),
			PanicHandler: func(err interface{}) {
				pfxlog.Logger().
					WithField(logrus.ErrorKey, err).
					WithField("backtrace", string(debug.Stack())).Error("panic during background command processing")
			},
			WorkerFunction: backgroundCommandPoolWorker,
		}

		servermetrics.ConfigureGoroutinesPoolMetrics(&poolConfig, env.GetMetricsRegistry(), backgroundQueueMetricsBase)

		pool, err := goroutines.NewPool(poolConfig)
		if err != nil {
			pfxlog.Logger().WithError(err).Fatal("could not create background command worker pool")
		}
		result.backgroundPool = pool

		if env.GetConfig().Command.Background.DropWhenFull {
			result.droppedEntries = env.GetMetricsRegistry().Meter(backgroundQueueDroppedEntries)
		}
	}

	return result
}

type CommandManager struct {
	env                      Env
	registry                 ioc.Registry
	Decoders                 command.Decoders
	backgroundPool           goroutines.Pool
	backgroundDelayThreshold time.Duration
	droppedEntries           metrics.Meter
	backgroundWorkTimer      metrics.Timer
}

func (self *CommandManager) registerGenericCommands() {
	self.Decoders.RegisterF(int32(cmd_pb.CommandType_CreateEntityType), self.decodeCreateEntityCommand)
	self.Decoders.RegisterF(int32(cmd_pb.CommandType_UpdateEntityType), self.decodeUpdateEntityCommand)
	self.Decoders.RegisterF(int32(cmd_pb.CommandType_DeleteEntityType), self.decodeDeleteEntityCommand)
}

func (self *CommandManager) decodeCreateEntityCommand(_ int32, data []byte) (command.Command, error) {
	msg := &cmd_pb.CreateEntityCommand{}
	if err := proto.Unmarshal(data, msg); err != nil {
		return nil, err
	}

	decoder, err := ioc.Get[createDecoderF](self.registry, msg.EntityType+CreateDecoder)
	if err != nil {
		return nil, err
	}

	return decoder(msg)
}

func (self *CommandManager) decodeUpdateEntityCommand(_ int32, data []byte) (command.Command, error) {
	msg := &cmd_pb.UpdateEntityCommand{}
	if err := proto.Unmarshal(data, msg); err != nil {
		return nil, err
	}

	decoder, err := ioc.Get[updateDecoderF](self.registry, msg.EntityType+UpdateDecoder)
	if err != nil {
		return nil, err
	}

	return decoder(msg)
}

func (self *CommandManager) decodeDeleteEntityCommand(_ int32, data []byte) (command.Command, error) {
	msg := &cmd_pb.DeleteEntityCommand{}
	if err := proto.Unmarshal(data, msg); err != nil {
		return nil, err
	}

	decoder, err := ioc.Get[deleteDecoderF](self.registry, msg.EntityType+DeleteDecoder)
	if err != nil {
		return nil, err
	}

	return decoder(msg)
}

func backgroundCommandPoolWorker(_ uint32, f func()) {
	f()
}

func (self *CommandManager) backGroundableTask(f func()) bool {
	if self.env.GetConfig().Command.Background.Enabled && !self.isBackgroundWorkTimerBelowThreshold() {
		if self.env.GetConfig().Command.Background.DropWhenFull {
			if err := self.backgroundPool.QueueOrError(f); err != nil {
				if errors.Is(err, goroutines.QueueFullError) {
					self.droppedEntries.Mark(1)
				}
				return false
			}
		} else {
			if err := self.backgroundPool.Queue(f); err != nil {
				return false
			}
		}
		return true
	}

	self.backgroundWorkTimer.Time(f)
	return true
}

func (self *CommandManager) isBackgroundWorkTimerBelowThreshold() bool {
	return self.backgroundWorkTimer.Percentile(0.9) < float64(self.backgroundDelayThreshold.Nanoseconds())
}

// CommandMsg is a TypedMessage which is also a pointer type.
//
// T is message type. We want to enforce that the TypeMessage implementation is a pointer type
// so we can use new(T) to create instances of it
type CommandMsg[T any] interface {
	cmd_pb.TypedMessage
	*T
}

type creator[T models.Entity] interface {
	command.EntityCreator[T]
	Dispatch(cmd command.Command) error
}

type updater[T models.Entity] interface {
	command.EntityUpdater[T]
	Dispatch(cmd command.Command) error
}

func DispatchCreate[T models.Entity](c creator[T], entity T, ctx *change.Context) error {
	if entity.GetId() == "" {
		id := idgen.MustNewUUIDString()
		entity.SetId(id)
	}

	cmd := &command.CreateEntityCommand[T]{
		Context: ctx,
		Creator: c,
		Entity:  entity,
	}

	return c.Dispatch(cmd)
}

func DispatchUpdate[T models.Entity](u updater[T], entity T, updatedFields fields.UpdatedFields, ctx *change.Context) error {
	cmd := &command.UpdateEntityCommand[T]{
		Context:       ctx,
		Updater:       u,
		Entity:        entity,
		UpdatedFields: updatedFields,
	}

	return u.Dispatch(cmd)
}