storj/satellite/downtime/estimation_chore.go

// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package downtime

import (
	"context"
	"time"

	"go.uber.org/zap"

	"storj.io/common/sync2"
	"storj.io/storj/satellite/overlay"
)

// EstimationChore estimates how long nodes have been offline.
//
// architecture: Chore
type EstimationChore struct {
	log       *zap.Logger
	Loop      *sync2.Cycle
	limiter   *sync2.Limiter
	config    Config
	startTime time.Time
	overlay   *overlay.Service
	service   *Service
	db        DB
}

// NewEstimationChore instantiates EstimationChore.
func NewEstimationChore(log *zap.Logger, config Config, overlay *overlay.Service, service *Service, db DB) *EstimationChore {
	if config.EstimationConcurrencyLimit <= 0 {
		config.EstimationConcurrencyLimit = 1
	}
	return &EstimationChore{
		log:       log,
		Loop:      sync2.NewCycle(config.EstimationInterval),
		limiter:   sync2.NewLimiter(config.EstimationConcurrencyLimit),
		config:    config,
		startTime: time.Now().UTC(),
		overlay:   overlay,
		service:   service,
		db:        db,
	}
}

// Run starts the chore.
func (chore *EstimationChore) Run(ctx context.Context) (err error) {
	defer mon.Task()(&ctx)(&err)
	return chore.Loop.Run(ctx, func(ctx context.Context) (err error) {
		defer mon.Task()(&ctx)(&err)

		chore.log.Debug("checking uptime of failed nodes",
			zap.Stringer("interval", chore.config.EstimationInterval))

		offlineNodes, err := chore.overlay.GetOfflineNodesLimited(ctx, chore.config.EstimationBatchSize)
		if err != nil {
			chore.log.Error("error getting offline nodes", zap.Error(err))
			return nil
		}

		for _, node := range offlineNodes {
			node := node
			chore.limiter.Go(ctx, func() {
				success, err := chore.service.CheckAndUpdateNodeAvailability(ctx, node.URL)
				if err != nil {
					chore.log.Error("error during downtime estimation ping back",
						zap.Bool("success", success),
						zap.Error(err))
					return
				}
				if !success && node.LastContactFailure.After(chore.startTime) {
					now := time.Now().UTC()
					duration := now.Sub(node.LastContactFailure)

					err = chore.db.Add(ctx, node.URL.ID, now, duration)
					if err != nil {
						chore.log.Error("error adding node seconds offline information.",
							zap.Stringer("node ID", node.URL.ID),
							zap.Stringer("duration", duration),
							zap.Error(err))
					}
				}
			})
		}
		chore.limiter.Wait()
		return nil
	})
}

// Close closes chore.
func (chore *EstimationChore) Close() error {
	chore.Loop.Close()
	return nil
}