/
service.go
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/
service.go
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// Copyright © 2021 Weald Technology Trading.
// 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 batch
import (
"context"
"time"
"github.com/pkg/errors"
"github.com/rs/zerolog"
zerologger "github.com/rs/zerolog/log"
"github.com/wealdtech/execd/services/execdb"
"github.com/wealdtech/execd/services/scheduler"
"golang.org/x/sync/semaphore"
)
// Service is a chain database service.
type Service struct {
scheduler scheduler.Service
blocksProvider execdb.BlocksProvider
transactionsProvider execdb.TransactionsProvider
transactionStateDiffsProvider execdb.TransactionStateDiffsProvider
blockRewardsSetter execdb.BlockRewardsSetter
processConcurrency int64
interval time.Duration
activitySem *semaphore.Weighted
}
// module-wide log.
var log zerolog.Logger
// New creates a new service.
func New(ctx context.Context, params ...Parameter) (*Service, error) {
parameters, err := parseAndCheckParameters(params...)
if err != nil {
return nil, errors.Wrap(err, "problem with parameters")
}
// Set logging.
log = zerologger.With().Str("service", "blockrewards").Str("impl", "batch").Logger().Level(parameters.logLevel)
if err := registerMetrics(ctx, parameters.monitor); err != nil {
return nil, errors.New("failed to register metrics")
}
s := &Service{
scheduler: parameters.scheduler,
blocksProvider: parameters.blocksProvider,
transactionsProvider: parameters.transactionsProvider,
transactionStateDiffsProvider: parameters.transactionStateDiffsProvider,
blockRewardsSetter: parameters.blockRewardsSetter,
processConcurrency: parameters.processConcurrency,
interval: parameters.interval,
activitySem: semaphore.NewWeighted(1),
}
// Update to current block before starting (in the background).
go s.updateOnRestart(ctx, parameters.startHeight)
return s, nil
}
func (s *Service) updateOnRestart(ctx context.Context, startHeight int64) {
// Work out the slot from which to start.
md, err := s.getMetadata(ctx)
if err != nil {
log.Fatal().Err(err).Msg("Failed to obtain metadata before catchup")
}
if startHeight >= 0 {
// Explicit requirement to start at a given height.
// Subtract one to state that the block higher than the required start is the last processed.
md.LatestHeight = startHeight - 1
}
log.Info().Int64("height", md.LatestHeight).Msg("Catching up from slot")
s.catchup(ctx, md)
log.Info().Int64("height", md.LatestHeight).Msg("Caught up; starting periodic update")
runtimeFunc := func(ctx context.Context, data interface{}) (time.Time, error) {
return time.Now().Add(s.interval), nil
}
if err := s.scheduler.SchedulePeriodicJob(ctx,
"update",
"Update block rewards",
runtimeFunc,
nil,
s.updateOnScheduleTick,
nil,
); err != nil {
log.Fatal().Err(err).Msg("Failed to schedule block rewards updates.")
}
}
func (s *Service) updateOnScheduleTick(ctx context.Context, data interface{}) {
// Only allow 1 handler to be active.
acquired := s.activitySem.TryAcquire(1)
if !acquired {
log.Debug().Msg("Another handler running")
return
}
defer s.activitySem.Release(1)
// Work out the slot from which to start.
md, err := s.getMetadata(ctx)
if err != nil {
log.Error().Err(err).Msg("Failed to obtain metadata for update")
return
}
log.Trace().Int64("height", md.LatestHeight).Msg("Catching up from slot")
s.catchup(ctx, md)
log.Trace().Int64("height", md.LatestHeight).Msg("Caught up")
}