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app.go
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app.go
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package ledgerexporter
import (
"context"
_ "embed"
"fmt"
"os"
"os/signal"
"sync"
"syscall"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/shantanu-hashcash/go/historyarchive"
"github.com/shantanu-hashcash/go/ingest/ledgerbackend"
_ "github.com/shantanu-hashcash/go/network"
"github.com/shantanu-hashcash/go/support/datastore"
supporthttp "github.com/shantanu-hashcash/go/support/http"
"github.com/shantanu-hashcash/go/support/log"
)
var (
logger = log.New().WithField("service", "ledger-exporter")
)
func NewDataAlreadyExportedError(Start uint32, End uint32) *DataAlreadyExportedError {
return &DataAlreadyExportedError{
Start: Start,
End: End,
}
}
type DataAlreadyExportedError struct {
Start uint32
End uint32
}
func (m DataAlreadyExportedError) Error() string {
return fmt.Sprintf("For export ledger range start=%d, end=%d, the remote storage has all the data, there is no need to continue export", m.Start, m.End)
}
func NewInvalidDataStoreError(LedgerSequence uint32, LedgersPerFile uint32) *InvalidDataStoreError {
return &InvalidDataStoreError{
LedgerSequence: LedgerSequence,
LedgersPerFile: LedgersPerFile,
}
}
type InvalidDataStoreError struct {
LedgerSequence uint32
LedgersPerFile uint32
}
func (m InvalidDataStoreError) Error() string {
return fmt.Sprintf("The remote data store has inconsistent data, "+
"a resumable starting ledger of %v was identified, "+
"but that is not aligned to expected ledgers-per-file of %v. use '--resume false' to bypass",
m.LedgerSequence, m.LedgersPerFile)
}
type App struct {
config *Config
ledgerBackend ledgerbackend.LedgerBackend
dataStore datastore.DataStore
exportManager *ExportManager
uploader Uploader
flags Flags
prometheusRegistry *prometheus.Registry
}
func NewApp(flags Flags) *App {
logger.SetLevel(log.DebugLevel)
registry := prometheus.NewRegistry()
registry.MustRegister(
collectors.NewProcessCollector(collectors.ProcessCollectorOpts{Namespace: "ledger_exporter"}),
collectors.NewGoCollector(),
)
app := &App{flags: flags, prometheusRegistry: registry}
return app
}
func (a *App) init(ctx context.Context) error {
var err error
var archive historyarchive.ArchiveInterface
if a.config, err = NewConfig(ctx, a.flags); err != nil {
return errors.Wrap(err, "Could not load configuration")
}
if archive, err = datastore.CreateHistoryArchiveFromNetworkName(ctx, a.config.Network); err != nil {
return err
}
a.config.ValidateAndSetLedgerRange(ctx, archive)
if a.dataStore, err = datastore.NewDataStore(ctx, a.config.DataStoreConfig, a.config.Network); err != nil {
return errors.Wrap(err, "Could not connect to destination data store")
}
if a.config.Resume {
if err = a.applyResumability(ctx,
datastore.NewResumableManager(a.dataStore, a.config.Network, a.config.LedgerBatchConfig, archive)); err != nil {
return err
}
}
logger.Infof("Final computed ledger range for backend retrieval and export, start=%d, end=%d", a.config.StartLedger, a.config.EndLedger)
if a.ledgerBackend, err = newLedgerBackend(ctx, a.config, a.prometheusRegistry); err != nil {
return err
}
// TODO: make number of upload workers configurable instead of hard coding it to 1
queue := NewUploadQueue(1, a.prometheusRegistry)
if a.exportManager, err = NewExportManager(a.config.LedgerBatchConfig, a.ledgerBackend, queue, a.prometheusRegistry); err != nil {
return err
}
a.uploader = NewUploader(a.dataStore, queue, a.prometheusRegistry)
return nil
}
func (a *App) applyResumability(ctx context.Context, resumableManager datastore.ResumableManager) error {
absentLedger, ok, err := resumableManager.FindStart(ctx, a.config.StartLedger, a.config.EndLedger)
if err != nil {
return err
}
if !ok {
return NewDataAlreadyExportedError(a.config.StartLedger, a.config.EndLedger)
}
// TODO - evaluate a more robust validation of remote data for ledgers-per-file consistency
// this assumes ValidateAndSetLedgerRange() has conditioned the a.config.StartLedger to be at least > 1
if absentLedger > 2 && absentLedger != a.config.LedgerBatchConfig.GetSequenceNumberStartBoundary(absentLedger) {
return NewInvalidDataStoreError(absentLedger, a.config.LedgerBatchConfig.LedgersPerFile)
}
logger.Infof("For export ledger range start=%d, end=%d, the remote storage has some of this data already, will resume at later start ledger of %d", a.config.StartLedger, a.config.EndLedger, absentLedger)
a.config.StartLedger = absentLedger
return nil
}
func (a *App) close() {
if err := a.dataStore.Close(); err != nil {
logger.WithError(err).Error("Error closing datastore")
}
if err := a.ledgerBackend.Close(); err != nil {
logger.WithError(err).Error("Error closing ledgerBackend")
}
}
func (a *App) serveAdmin() {
if a.config.AdminPort == 0 {
return
}
mux := supporthttp.NewMux(logger)
mux.Handle("/metrics", promhttp.HandlerFor(a.prometheusRegistry, promhttp.HandlerOpts{}))
addr := fmt.Sprintf(":%d", a.config.AdminPort)
supporthttp.Run(supporthttp.Config{
ListenAddr: addr,
Handler: mux,
OnStarting: func() {
logger.Infof("Starting admin port server on %s", addr)
},
})
}
func (a *App) Run() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
if err := a.init(ctx); err != nil {
var dataAlreadyExported DataAlreadyExportedError
if errors.As(err, &dataAlreadyExported) {
logger.Info(err.Error())
logger.Info("Shutting down ledger-exporter")
return
}
logger.WithError(err).Fatal("Stopping ledger-exporter")
}
defer a.close()
var wg sync.WaitGroup
wg.Add(2)
go func() {
defer wg.Done()
err := a.uploader.Run(ctx)
if err != nil && !errors.Is(err, context.Canceled) {
logger.WithError(err).Error("Error executing Uploader")
cancel()
}
}()
go func() {
defer wg.Done()
err := a.exportManager.Run(ctx, a.config.StartLedger, a.config.EndLedger)
if err != nil && !errors.Is(err, context.Canceled) {
logger.WithError(err).Error("Error executing ExportManager")
cancel()
}
}()
go a.serveAdmin()
// Handle OS signals to gracefully terminate the service
sigCh := make(chan os.Signal, 1)
signal.Notify(sigCh, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
go func() {
sig := <-sigCh
logger.Infof("Received termination signal: %v", sig)
cancel()
}()
wg.Wait()
logger.Info("Shutting down ledger-exporter")
}
// newLedgerBackend Creates and initializes captive core ledger backend
// Currently, only supports captive-core as ledger backend
func newLedgerBackend(ctx context.Context, config *Config, prometheusRegistry *prometheus.Registry) (ledgerbackend.LedgerBackend, error) {
captiveConfig, err := config.GenerateCaptiveCoreConfig()
if err != nil {
return nil, err
}
var backend ledgerbackend.LedgerBackend
// Create a new captive core backend
backend, err = ledgerbackend.NewCaptive(captiveConfig)
if err != nil {
return nil, errors.Wrap(err, "Failed to create captive-core instance")
}
backend = ledgerbackend.WithMetrics(backend, prometheusRegistry, "ledger_exporter")
var ledgerRange ledgerbackend.Range
if config.EndLedger == 0 {
ledgerRange = ledgerbackend.UnboundedRange(config.StartLedger)
} else {
ledgerRange = ledgerbackend.BoundedRange(config.StartLedger, config.EndLedger)
}
if err = backend.PrepareRange(ctx, ledgerRange); err != nil {
return nil, errors.Wrap(err, "Could not prepare captive core ledger backend")
}
return backend, nil
}