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service.go
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service.go
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// Copyright © 2022 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"
"fmt"
"sync"
"time"
execclient "github.com/attestantio/go-execution-client"
"github.com/attestantio/go-execution-client/types"
"github.com/pkg/errors"
"github.com/rs/zerolog"
zerologger "github.com/rs/zerolog/log"
"github.com/shopspring/decimal"
"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
chainHeightProvider execclient.ChainHeightProvider
balancesProvider execclient.BalancesProvider
blocksProvider execclient.BlocksProvider
balancesSetter execdb.BalancesSetter
dbBalancesProvider execdb.BalancesProvider
trackDistance uint32
addresses []types.Address
addressesMu sync.RWMutex
processConcurrency int64
interval time.Duration
activitySem *semaphore.Weighted
currentBalances map[types.Address]decimal.Decimal
currentBalancesMu sync.Mutex
}
// 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", "balances").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,
chainHeightProvider: parameters.chainHeightProvider,
balancesProvider: parameters.balancesProvider,
blocksProvider: parameters.blocksProvider,
balancesSetter: parameters.balancesSetter,
dbBalancesProvider: parameters.dbBalancesProvider,
trackDistance: parameters.trackDistance,
addresses: parameters.addresses,
processConcurrency: parameters.processConcurrency,
interval: parameters.interval,
activitySem: semaphore.NewWeighted(1),
currentBalances: make(map[types.Address]decimal.Decimal, len(parameters.addresses)),
}
// 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
// }
// Populate the balance cache.
if err := s.populateBalanceCache(ctx, md.LatestHeights); err != nil {
log.Fatal().Err(err).Msg("Failed to populate balance cache")
}
log.Info().Msg("Catching up")
s.catchup(ctx, md)
log.Info().Msg("Caught up")
runtimeFunc := func(ctx context.Context, data interface{}) (time.Time, error) {
return time.Now().Add(s.interval), nil
}
if err := s.scheduler.SchedulePeriodicJob(ctx,
"Balances",
"Balance updates",
runtimeFunc,
nil,
s.updateOnScheduleTick,
nil,
); err != nil {
log.Fatal().Err(err).Msg("Failed to schedule balance 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().Msg("Catching up")
s.catchup(ctx, md)
log.Trace().Msg("Caught up")
}
func (s *Service) populateBalanceCache(ctx context.Context, heights map[string]int64) error {
// Start by setting all balances to 0.
s.currentBalancesMu.Lock()
s.addressesMu.RLock()
defer s.addressesMu.RUnlock()
for _, address := range s.addresses {
s.currentBalances[address] = decimal.NewFromInt(0)
}
s.currentBalancesMu.Unlock()
for _, address := range s.addresses {
height, exists := heights[fmt.Sprintf("%#x", address)]
if !exists {
// Starting from the beginning.
continue
}
block, err := s.blocksProvider.Block(ctx, fmt.Sprintf("%d", height))
if err != nil {
return errors.Wrap(err, "failed to obtain block")
}
holders := [][]byte{address[:]}
timestamp := block.Timestamp()
balances, err := s.dbBalancesProvider.Balances(ctx, &execdb.BalanceFilter{
To: ×tamp,
Order: execdb.OrderLatest,
Limit: 1,
Currency: "WEI",
Holders: holders,
})
if err != nil {
return errors.Wrap(err, "failed to obtain database balances")
}
if len(balances) > 0 {
s.currentBalancesMu.Lock()
s.currentBalances[balances[0].Address] = balances[0].Amount
s.currentBalancesMu.Unlock()
log.Trace().Str("address", fmt.Sprintf("%#x", address)).Str("balance", balances[0].Amount.String()).Msg("Initial balance")
}
}
return nil
}
// SetAddresses sets the addresses to monitor.
func (s *Service) SetAddresses(addresses []types.Address) {
s.addressesMu.Lock()
s.addresses = addresses
s.addressesMu.Unlock()
}