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index.go
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package filter
import (
"context"
"database/sql"
"errors"
"fmt"
"sort"
"strings"
"time"
"github.com/ipfs/go-cid"
logging "github.com/ipfs/go-log/v2"
_ "github.com/mattn/go-sqlite3"
"golang.org/x/xerrors"
"github.com/filecoin-project/go-address"
"github.com/filecoin-project/go-state-types/abi"
"github.com/filecoin-project/lotus/chain/store"
"github.com/filecoin-project/lotus/chain/types"
)
var pragmas = []string{
"PRAGMA synchronous = normal",
"PRAGMA temp_store = memory",
"PRAGMA mmap_size = 30000000000",
"PRAGMA page_size = 32768",
"PRAGMA auto_vacuum = NONE",
"PRAGMA automatic_index = OFF",
"PRAGMA journal_mode = WAL",
"PRAGMA read_uncommitted = ON",
}
var ddls = []string{
`CREATE TABLE IF NOT EXISTS event (
id INTEGER PRIMARY KEY,
height INTEGER NOT NULL,
tipset_key BLOB NOT NULL,
tipset_key_cid BLOB NOT NULL,
emitter_addr BLOB NOT NULL,
event_index INTEGER NOT NULL,
message_cid BLOB NOT NULL,
message_index INTEGER NOT NULL,
reverted INTEGER NOT NULL
)`,
`CREATE INDEX IF NOT EXISTS height_tipset_key ON event (height,tipset_key)`,
`CREATE TABLE IF NOT EXISTS event_entry (
event_id INTEGER,
indexed INTEGER NOT NULL,
flags BLOB NOT NULL,
key TEXT NOT NULL,
codec INTEGER,
value BLOB NOT NULL
)`,
// metadata containing version of schema
`CREATE TABLE IF NOT EXISTS _meta (
version UINT64 NOT NULL UNIQUE
)`,
`INSERT OR IGNORE INTO _meta (version) VALUES (1)`,
`INSERT OR IGNORE INTO _meta (version) VALUES (2)`,
}
var (
log = logging.Logger("filter")
)
const (
schemaVersion = 2
eventExists = `SELECT MAX(id) FROM event WHERE height=? AND tipset_key=? AND tipset_key_cid=? AND emitter_addr=? AND event_index=? AND message_cid=? AND message_index=?`
insertEvent = `INSERT OR IGNORE INTO event(height, tipset_key, tipset_key_cid, emitter_addr, event_index, message_cid, message_index, reverted) VALUES(?, ?, ?, ?, ?, ?, ?, ?)`
insertEntry = `INSERT OR IGNORE INTO event_entry(event_id, indexed, flags, key, codec, value) VALUES(?, ?, ?, ?, ?, ?)`
revertEventsInTipset = `UPDATE event SET reverted=true WHERE height=? AND tipset_key=?`
restoreEvent = `UPDATE event SET reverted=false WHERE height=? AND tipset_key=? AND tipset_key_cid=? AND emitter_addr=? AND event_index=? AND message_cid=? AND message_index=?`
)
type EventIndex struct {
db *sql.DB
stmtEventExists *sql.Stmt
stmtInsertEvent *sql.Stmt
stmtInsertEntry *sql.Stmt
stmtRevertEventsInTipset *sql.Stmt
stmtRestoreEvent *sql.Stmt
}
func (ei *EventIndex) initStatements() (err error) {
ei.stmtEventExists, err = ei.db.Prepare(eventExists)
if err != nil {
return xerrors.Errorf("prepare stmtEventExists: %w", err)
}
ei.stmtInsertEvent, err = ei.db.Prepare(insertEvent)
if err != nil {
return xerrors.Errorf("prepare stmtInsertEvent: %w", err)
}
ei.stmtInsertEntry, err = ei.db.Prepare(insertEntry)
if err != nil {
return xerrors.Errorf("prepare stmtInsertEntry: %w", err)
}
ei.stmtRevertEventsInTipset, err = ei.db.Prepare(revertEventsInTipset)
if err != nil {
return xerrors.Errorf("prepare stmtRevertEventsInTipset: %w", err)
}
ei.stmtRestoreEvent, err = ei.db.Prepare(restoreEvent)
if err != nil {
return xerrors.Errorf("prepare stmtRestoreEvent: %w", err)
}
return nil
}
func (ei *EventIndex) migrateToVersion2(ctx context.Context, chainStore *store.ChainStore) error {
now := time.Now()
tx, err := ei.db.Begin()
if err != nil {
return xerrors.Errorf("begin transaction: %w", err)
}
// rollback the transaction (a no-op if the transaction was already committed)
defer tx.Rollback() //nolint:errcheck
// create some temporary indices to help speed up the migration
_, err = tx.Exec("CREATE INDEX IF NOT EXISTS tmp_height_tipset_key_cid ON event (height,tipset_key_cid)")
if err != nil {
return xerrors.Errorf("create index tmp_height_tipset_key_cid: %w", err)
}
_, err = tx.Exec("CREATE INDEX IF NOT EXISTS tmp_tipset_key_cid ON event (tipset_key_cid)")
if err != nil {
return xerrors.Errorf("create index tmp_tipset_key_cid: %w", err)
}
stmtDeleteOffChainEvent, err := tx.Prepare("DELETE FROM event WHERE tipset_key_cid!=? and height=?")
if err != nil {
return xerrors.Errorf("prepare stmtDeleteOffChainEvent: %w", err)
}
stmtSelectEvent, err := tx.Prepare("SELECT id FROM event WHERE tipset_key_cid=? ORDER BY message_index ASC, event_index ASC, id DESC LIMIT 1")
if err != nil {
return xerrors.Errorf("prepare stmtSelectEvent: %w", err)
}
stmtDeleteEvent, err := tx.Prepare("DELETE FROM event WHERE tipset_key_cid=? AND id<?")
if err != nil {
return xerrors.Errorf("prepare stmtDeleteEvent: %w", err)
}
// get the lowest height tipset
var minHeight sql.NullInt64
err = ei.db.QueryRow("SELECT MIN(height) FROM event").Scan(&minHeight)
if err != nil {
if err == sql.ErrNoRows {
return nil
}
return xerrors.Errorf("query min height: %w", err)
}
log.Infof("Migrating events from head to %d", minHeight.Int64)
currTs := chainStore.GetHeaviestTipSet()
for int64(currTs.Height()) >= minHeight.Int64 {
if currTs.Height()%1000 == 0 {
log.Infof("Migrating height %d (remaining %d)", currTs.Height(), int64(currTs.Height())-minHeight.Int64)
}
tsKey := currTs.Parents()
currTs, err = chainStore.GetTipSetFromKey(ctx, tsKey)
if err != nil {
return xerrors.Errorf("get tipset from key: %w", err)
}
log.Debugf("Migrating height %d", currTs.Height())
tsKeyCid, err := currTs.Key().Cid()
if err != nil {
return fmt.Errorf("tipset key cid: %w", err)
}
// delete all events that are not in the canonical chain
_, err = stmtDeleteOffChainEvent.Exec(tsKeyCid.Bytes(), currTs.Height())
if err != nil {
return xerrors.Errorf("delete off chain event: %w", err)
}
// find the first eventId from the last time the tipset was applied
var eventId sql.NullInt64
err = stmtSelectEvent.QueryRow(tsKeyCid.Bytes()).Scan(&eventId)
if err != nil {
if err == sql.ErrNoRows {
continue
}
return xerrors.Errorf("select event: %w", err)
}
// this tipset might not have any events which is ok
if !eventId.Valid {
continue
}
log.Debugf("Deleting all events with id < %d at height %d", eventId.Int64, currTs.Height())
res, err := stmtDeleteEvent.Exec(tsKeyCid.Bytes(), eventId.Int64)
if err != nil {
return xerrors.Errorf("delete event: %w", err)
}
nrRowsAffected, err := res.RowsAffected()
if err != nil {
return xerrors.Errorf("rows affected: %w", err)
}
log.Debugf("deleted %d events from tipset %s", nrRowsAffected, tsKeyCid.String())
}
// delete all entries that have an event_id that doesn't exist (since we don't have a foreign
// key constraint that gives us cascading deletes)
res, err := tx.Exec("DELETE FROM event_entry WHERE event_id NOT IN (SELECT id FROM event)")
if err != nil {
return xerrors.Errorf("delete event_entry: %w", err)
}
nrRowsAffected, err := res.RowsAffected()
if err != nil {
return xerrors.Errorf("rows affected: %w", err)
}
log.Infof("cleaned up %d entries that had deleted events\n", nrRowsAffected)
// drop the temporary indices after the migration
_, err = tx.Exec("DROP INDEX IF EXISTS tmp_tipset_key_cid")
if err != nil {
return xerrors.Errorf("create index tmp_tipset_key_cid: %w", err)
}
_, err = tx.Exec("DROP INDEX IF EXISTS tmp_height_tipset_key_cid")
if err != nil {
return xerrors.Errorf("drop index tmp_height_tipset_key_cid: %w", err)
}
err = tx.Commit()
if err != nil {
return xerrors.Errorf("commit transaction: %w", err)
}
// during the migration, we have likely increased the WAL size a lot, so lets do some
// simple DB administration to free up space (VACUUM followed by truncating the WAL file)
// as this would be a good time to do it when no other writes are happening
log.Infof("Performing DB vacuum and wal checkpointing to free up space after the migration")
_, err = ei.db.Exec("VACUUM")
if err != nil {
log.Warnf("error vacuuming database: %s", err)
}
_, err = ei.db.Exec("PRAGMA wal_checkpoint(TRUNCATE)")
if err != nil {
log.Warnf("error checkpointing wal: %s", err)
}
log.Infof("Successfully migrated events to version 2 in %s", time.Since(now))
return nil
}
func NewEventIndex(ctx context.Context, path string, chainStore *store.ChainStore) (*EventIndex, error) {
db, err := sql.Open("sqlite3", path+"?mode=rwc")
if err != nil {
return nil, xerrors.Errorf("open sqlite3 database: %w", err)
}
for _, pragma := range pragmas {
if _, err := db.Exec(pragma); err != nil {
_ = db.Close()
return nil, xerrors.Errorf("exec pragma %q: %w", pragma, err)
}
}
eventIndex := EventIndex{db: db}
q, err := db.Query("SELECT name FROM sqlite_master WHERE type='table' AND name='_meta';")
if err == sql.ErrNoRows || !q.Next() {
// empty database, create the schema
for _, ddl := range ddls {
if _, err := db.Exec(ddl); err != nil {
_ = db.Close()
return nil, xerrors.Errorf("exec ddl %q: %w", ddl, err)
}
}
} else if err != nil {
_ = db.Close()
return nil, xerrors.Errorf("looking for _meta table: %w", err)
} else {
// check the schema version to see if we need to upgrade the database schema
var version int
err := db.QueryRow("SELECT max(version) FROM _meta").Scan(&version)
if err != nil {
_ = db.Close()
return nil, xerrors.Errorf("invalid database version: no version found")
}
if version == 1 {
log.Infof("upgrading event index from version 1 to version 2")
err = eventIndex.migrateToVersion2(ctx, chainStore)
if err != nil {
_ = db.Close()
return nil, xerrors.Errorf("could not migrate sql data to version 2: %w", err)
}
// to upgrade to version version 2 we only need to create an index on the event table
// which means we can just recreate the schema (it will not have any effect on existing data)
for _, ddl := range ddls {
if _, err := db.Exec(ddl); err != nil {
_ = db.Close()
return nil, xerrors.Errorf("could not upgrade index to version 2, exec ddl %q: %w", ddl, err)
}
}
version = 2
}
if version != schemaVersion {
_ = db.Close()
return nil, xerrors.Errorf("invalid database version: got %d, expected %d", version, schemaVersion)
}
}
err = eventIndex.initStatements()
if err != nil {
_ = db.Close()
return nil, xerrors.Errorf("error preparing eventIndex database statements: %w", err)
}
return &eventIndex, nil
}
func (ei *EventIndex) Close() error {
if ei.db == nil {
return nil
}
return ei.db.Close()
}
func (ei *EventIndex) CollectEvents(ctx context.Context, te *TipSetEvents, revert bool, resolver func(ctx context.Context, emitter abi.ActorID, ts *types.TipSet) (address.Address, bool)) error {
tx, err := ei.db.Begin()
if err != nil {
return xerrors.Errorf("begin transaction: %w", err)
}
// rollback the transaction (a no-op if the transaction was already committed)
defer tx.Rollback() //nolint:errcheck
// lets handle the revert case first, since its simpler and we can simply mark all events events in this tipset as reverted and return
if revert {
_, err = tx.Stmt(ei.stmtRevertEventsInTipset).Exec(te.msgTs.Height(), te.msgTs.Key().Bytes())
if err != nil {
return xerrors.Errorf("revert event: %w", err)
}
err = tx.Commit()
if err != nil {
return xerrors.Errorf("commit transaction: %w", err)
}
return nil
}
// cache of lookups between actor id and f4 address
addressLookups := make(map[abi.ActorID]address.Address)
ems, err := te.messages(ctx)
if err != nil {
return xerrors.Errorf("load executed messages: %w", err)
}
// iterate over all executed messages in this tipset and insert them into the database if they
// don't exist, otherwise mark them as not reverted
for msgIdx, em := range ems {
for evIdx, ev := range em.Events() {
addr, found := addressLookups[ev.Emitter]
if !found {
var ok bool
addr, ok = resolver(ctx, ev.Emitter, te.rctTs)
if !ok {
// not an address we will be able to match against
continue
}
addressLookups[ev.Emitter] = addr
}
tsKeyCid, err := te.msgTs.Key().Cid()
if err != nil {
return xerrors.Errorf("tipset key cid: %w", err)
}
// check if this event already exists in the database
var entryID sql.NullInt64
err = tx.Stmt(ei.stmtEventExists).QueryRow(
te.msgTs.Height(), // height
te.msgTs.Key().Bytes(), // tipset_key
tsKeyCid.Bytes(), // tipset_key_cid
addr.Bytes(), // emitter_addr
evIdx, // event_index
em.Message().Cid().Bytes(), // message_cid
msgIdx, // message_index
).Scan(&entryID)
if err != nil {
return xerrors.Errorf("error checking if event exists: %w", err)
}
if !entryID.Valid {
// event does not exist, lets insert it
res, err := tx.Stmt(ei.stmtInsertEvent).Exec(
te.msgTs.Height(), // height
te.msgTs.Key().Bytes(), // tipset_key
tsKeyCid.Bytes(), // tipset_key_cid
addr.Bytes(), // emitter_addr
evIdx, // event_index
em.Message().Cid().Bytes(), // message_cid
msgIdx, // message_index
false, // reverted
)
if err != nil {
return xerrors.Errorf("exec insert event: %w", err)
}
entryID.Int64, err = res.LastInsertId()
if err != nil {
return xerrors.Errorf("get last row id: %w", err)
}
// insert all the entries for this event
for _, entry := range ev.Entries {
_, err = tx.Stmt(ei.stmtInsertEntry).Exec(
entryID.Int64, // event_id
isIndexedValue(entry.Flags), // indexed
[]byte{entry.Flags}, // flags
entry.Key, // key
entry.Codec, // codec
entry.Value, // value
)
if err != nil {
return xerrors.Errorf("exec insert entry: %w", err)
}
}
} else {
// event already exists, lets mark it as not reverted
res, err := tx.Stmt(ei.stmtRestoreEvent).Exec(
te.msgTs.Height(), // height
te.msgTs.Key().Bytes(), // tipset_key
tsKeyCid.Bytes(), // tipset_key_cid
addr.Bytes(), // emitter_addr
evIdx, // event_index
em.Message().Cid().Bytes(), // message_cid
msgIdx, // message_index
)
if err != nil {
return xerrors.Errorf("exec restore event: %w", err)
}
rowsAffected, err := res.RowsAffected()
if err != nil {
return xerrors.Errorf("error getting rows affected: %s", err)
}
// this is a sanity check as we should only ever be updating one event
if rowsAffected != 1 {
log.Warnf("restored %d events but expected only one to exist", rowsAffected)
}
}
}
}
err = tx.Commit()
if err != nil {
return xerrors.Errorf("commit transaction: %w", err)
}
return nil
}
// PrefillFilter fills a filter's collection of events from the historic index
func (ei *EventIndex) PrefillFilter(ctx context.Context, f *EventFilter) error {
clauses := []string{}
values := []any{}
joins := []string{}
if f.tipsetCid != cid.Undef {
clauses = append(clauses, "event.tipset_key_cid=?")
values = append(values, f.tipsetCid.Bytes())
} else {
if f.minHeight >= 0 {
clauses = append(clauses, "event.height>=?")
values = append(values, f.minHeight)
}
if f.maxHeight >= 0 {
clauses = append(clauses, "event.height<=?")
values = append(values, f.maxHeight)
}
}
if len(f.addresses) > 0 {
subclauses := []string{}
for _, addr := range f.addresses {
subclauses = append(subclauses, "emitter_addr=?")
values = append(values, addr.Bytes())
}
clauses = append(clauses, "("+strings.Join(subclauses, " OR ")+")")
}
if len(f.keys) > 0 {
join := 0
for key, vals := range f.keys {
if len(vals) > 0 {
join++
joinAlias := fmt.Sprintf("ee%d", join)
joins = append(joins, fmt.Sprintf("event_entry %s on event.id=%[1]s.event_id", joinAlias))
clauses = append(clauses, fmt.Sprintf("%s.indexed=1 AND %[1]s.key=?", joinAlias))
values = append(values, key)
subclauses := []string{}
for _, val := range vals {
subclauses = append(subclauses, fmt.Sprintf("%s.value=?", joinAlias))
values = append(values, val)
}
clauses = append(clauses, "("+strings.Join(subclauses, " OR ")+")")
}
}
}
s := `SELECT
event.id,
event.height,
event.tipset_key,
event.tipset_key_cid,
event.emitter_addr,
event.event_index,
event.message_cid,
event.message_index,
event.reverted,
event_entry.flags,
event_entry.key,
event_entry.codec,
event_entry.value
FROM event JOIN event_entry ON event.id=event_entry.event_id`
if len(joins) > 0 {
s = s + ", " + strings.Join(joins, ", ")
}
if len(clauses) > 0 {
s = s + " WHERE " + strings.Join(clauses, " AND ")
}
s += " ORDER BY event.height DESC"
stmt, err := ei.db.Prepare(s)
if err != nil {
return xerrors.Errorf("prepare prefill query: %w", err)
}
q, err := stmt.QueryContext(ctx, values...)
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil
}
return xerrors.Errorf("exec prefill query: %w", err)
}
var ces []*CollectedEvent
var currentID int64 = -1
var ce *CollectedEvent
for q.Next() {
select {
case <-ctx.Done():
return ctx.Err()
default:
}
var row struct {
id int64
height uint64
tipsetKey []byte
tipsetKeyCid []byte
emitterAddr []byte
eventIndex int
messageCid []byte
messageIndex int
reverted bool
flags []byte
key string
codec uint64
value []byte
}
if err := q.Scan(
&row.id,
&row.height,
&row.tipsetKey,
&row.tipsetKeyCid,
&row.emitterAddr,
&row.eventIndex,
&row.messageCid,
&row.messageIndex,
&row.reverted,
&row.flags,
&row.key,
&row.codec,
&row.value,
); err != nil {
return xerrors.Errorf("read prefill row: %w", err)
}
if row.id != currentID {
if ce != nil {
ces = append(ces, ce)
ce = nil
// Unfortunately we can't easily incorporate the max results limit into the query due to the
// unpredictable number of rows caused by joins
// Break here to stop collecting rows
if f.maxResults > 0 && len(ces) >= f.maxResults {
break
}
}
currentID = row.id
ce = &CollectedEvent{
EventIdx: row.eventIndex,
Reverted: row.reverted,
Height: abi.ChainEpoch(row.height),
MsgIdx: row.messageIndex,
}
ce.EmitterAddr, err = address.NewFromBytes(row.emitterAddr)
if err != nil {
return xerrors.Errorf("parse emitter addr: %w", err)
}
ce.TipSetKey, err = types.TipSetKeyFromBytes(row.tipsetKey)
if err != nil {
return xerrors.Errorf("parse tipsetkey: %w", err)
}
ce.MsgCid, err = cid.Cast(row.messageCid)
if err != nil {
return xerrors.Errorf("parse message cid: %w", err)
}
}
ce.Entries = append(ce.Entries, types.EventEntry{
Flags: row.flags[0],
Key: row.key,
Codec: row.codec,
Value: row.value,
})
}
if ce != nil {
ces = append(ces, ce)
}
if len(ces) == 0 {
return nil
}
// collected event list is in inverted order since we selected only the most recent events
// sort it into height order
sort.Slice(ces, func(i, j int) bool { return ces[i].Height < ces[j].Height })
f.setCollectedEvents(ces)
return nil
}