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postgresql_exporter.go
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/
postgresql_exporter.go
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package postgresql
import (
"context"
_ "embed" // used to embed config
"errors"
"fmt"
"io"
"sync"
"sync/atomic"
"github.com/sirupsen/logrus"
sdk "github.com/algorand/go-algorand-sdk/v2/types"
"github.com/algorand/indexer/v3/idb"
_ "github.com/algorand/indexer/v3/idb/postgres" // register driver
"github.com/algorand/indexer/v3/types"
iutil "github.com/algorand/indexer/v3/util"
"github.com/algorand/conduit/conduit/data"
"github.com/algorand/conduit/conduit/plugins"
"github.com/algorand/conduit/conduit/plugins/exporters"
"github.com/algorand/conduit/conduit/plugins/exporters/postgresql/util"
)
// PluginName to use when configuring.
const PluginName = "postgresql"
var errMissingDelta = errors.New("ledger state delta is missing from block, ensure algod importer is using 'follower' mode")
type postgresqlExporter struct {
round uint64
cfg ExporterConfig
db idb.IndexerDb
logger *logrus.Logger
wg sync.WaitGroup
ctx context.Context
cf context.CancelFunc
dm util.DataManager
}
//go:embed sample.yaml
var sampleConfig string
var metadata = plugins.Metadata{
Name: PluginName,
Description: "Exporter for writing data to a postgresql instance.",
Deprecated: false,
SampleConfig: sampleConfig,
}
func (exp *postgresqlExporter) Metadata() plugins.Metadata {
return metadata
}
// createIndexerDB common code for creating the IndexerDb instance.
func createIndexerDB(logger *logrus.Logger, readonly bool, cfg plugins.PluginConfig) (idb.IndexerDb, chan struct{}, ExporterConfig, error) {
var eCfg ExporterConfig
if err := cfg.UnmarshalConfig(&eCfg); err != nil {
return nil, nil, eCfg, fmt.Errorf("connect failure in unmarshalConfig: %v", err)
}
logger.Debugf("createIndexerDB: eCfg.Delete=%+v", eCfg.Delete)
// Inject a dummy db for unit testing
dbName := "postgres"
if eCfg.Test {
dbName = "dummy"
}
var opts idb.IndexerDbOptions
opts.MaxConn = eCfg.MaxConn
opts.ReadOnly = readonly
// for some reason when ConnectionString is empty, it's automatically
// connecting to a local instance that's running.
// this behavior can be reproduced in TestConnectDbFailure.
if !eCfg.Test && eCfg.ConnectionString == "" {
return nil, nil, eCfg, fmt.Errorf("connection string is empty for %s", dbName)
}
db, ready, err := idb.IndexerDbByName(dbName, eCfg.ConnectionString, opts, logger)
if err != nil {
return nil, nil, eCfg, fmt.Errorf("connect failure constructing db, %s: %v", dbName, err)
}
return db, ready, eCfg, nil
}
// RoundRequest connects to the database, queries the round, and closes the
// connection. If there is a problem with the configuration, an error will be
// returned in the Init phase and this function will return 0.
func (exp *postgresqlExporter) RoundRequest(cfg plugins.PluginConfig) (uint64, error) {
nullLogger := logrus.New()
nullLogger.Out = io.Discard // no logging
db, _, _, err := createIndexerDB(nullLogger, true, cfg)
if err != nil {
// Assume the error is related to an uninitialized DB.
// If it is something more serious, the failure will be detected during Init.
return 0, nil
}
rnd, err := db.GetNextRoundToAccount()
// ignore non initialized error because that would happen during Init.
// This case probably wont be hit except in very unusual cases because
// in most cases `createIndexerDB` would fail first.
if err != nil && err != idb.ErrorNotInitialized {
return 0, fmt.Errorf("postgres.RoundRequest(): failed to get next round: %w", err)
}
return rnd, nil
}
func (exp *postgresqlExporter) Init(ctx context.Context, initProvider data.InitProvider, cfg plugins.PluginConfig, logger *logrus.Logger) error {
exp.ctx, exp.cf = context.WithCancel(ctx)
exp.logger = logger
db, ready, exporterConfig, err := createIndexerDB(exp.logger, false, cfg)
if err != nil {
return fmt.Errorf("db create error: %v", err)
}
exp.cfg = exporterConfig
<-ready
exp.db = db
_, err = iutil.EnsureInitialImport(exp.db, *initProvider.GetGenesis())
if err != nil {
return fmt.Errorf("error importing genesis: %v", err)
}
dbRound, err := db.GetNextRoundToAccount()
if err != nil {
return fmt.Errorf("error getting next db round : %v", err)
}
if uint64(initProvider.NextDBRound()) != dbRound {
return fmt.Errorf("initializing block round %d but next round to account is %d", initProvider.NextDBRound(), dbRound)
}
exp.round = uint64(initProvider.NextDBRound())
dataPruningEnabled := !exp.cfg.Test && exp.cfg.Delete.Rounds > 0
exp.logger.Debugf("postgresql exporter Init(): data pruning enabled: %t; exp.cfg.Delete: %+v", dataPruningEnabled, exp.cfg.Delete)
if dataPruningEnabled {
exp.dm = util.MakeDataManager(exp.ctx, &exp.cfg.Delete, exp.db, logger)
exp.wg.Add(1)
go exp.dm.DeleteLoop(&exp.wg, &exp.round)
}
return nil
}
func (exp *postgresqlExporter) Close() error {
if exp.db != nil {
exp.db.Close()
}
exp.cf()
exp.wg.Wait()
return nil
}
func (exp *postgresqlExporter) Receive(exportData data.BlockData) error {
if exportData.Delta == nil {
if exportData.Round() == 0 {
exportData.Delta = &sdk.LedgerStateDelta{}
} else {
return errMissingDelta
}
}
vb := types.ValidatedBlock{
Block: sdk.Block{BlockHeader: exportData.BlockHeader, Payset: exportData.Payset},
Delta: *exportData.Delta,
}
if err := exp.db.AddBlock(&vb); err != nil {
return err
}
atomic.StoreUint64(&exp.round, exportData.Round()+1)
return nil
}
func init() {
exporters.Register(PluginName, exporters.ExporterConstructorFunc(func() exporters.Exporter {
return &postgresqlExporter{}
}))
}