/
readdb.go
868 lines (762 loc) · 23.6 KB
/
readdb.go
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// Copyright 2019 Sorint.lab
//
// 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 readdb
import (
"context"
"database/sql"
"encoding/json"
"io"
"os"
"path/filepath"
"sync"
"time"
"agola.io/agola/internal/datamanager"
"agola.io/agola/internal/db"
"agola.io/agola/internal/errors"
"agola.io/agola/internal/etcd"
"agola.io/agola/internal/objectstorage"
"agola.io/agola/internal/sequence"
"agola.io/agola/internal/util"
"agola.io/agola/services/configstore/types"
sq "github.com/Masterminds/squirrel"
"github.com/rs/zerolog"
)
var (
// Use postgresql $ placeholder. It'll be converted to ? from the provided db functions
sb = sq.StatementBuilder.PlaceholderFormat(sq.Dollar)
revisionSelect = sb.Select("revision").From("revision")
revisionInsert = sb.Insert("revision").Columns("revision")
committedwalsequenceSelect = sb.Select("seq").From("committedwalsequence")
committedwalsequenceInsert = sb.Insert("committedwalsequence").Columns("seq")
changegrouprevisionSelect = sb.Select("id, revision").From("changegrouprevision")
changegrouprevisionInsert = sb.Insert("changegrouprevision").Columns("id", "revision")
)
type ReadDB struct {
log zerolog.Logger
dataDir string
e *etcd.Store
rdb *db.DB
ost *objectstorage.ObjStorage
dm *datamanager.DataManager
Initialized bool
initLock sync.Mutex
}
func NewReadDB(ctx context.Context, log zerolog.Logger, dataDir string, e *etcd.Store, ost *objectstorage.ObjStorage, dm *datamanager.DataManager) (*ReadDB, error) {
if err := os.MkdirAll(dataDir, 0770); err != nil {
return nil, errors.WithStack(err)
}
readDB := &ReadDB{
log: log,
dataDir: dataDir,
e: e,
ost: ost,
dm: dm,
}
return readDB, nil
}
func (r *ReadDB) SetInitialized(initialized bool) {
r.initLock.Lock()
r.Initialized = initialized
r.initLock.Unlock()
}
func (r *ReadDB) IsInitialized() bool {
r.initLock.Lock()
defer r.initLock.Unlock()
return r.Initialized
}
// Initialize populates the readdb with the current etcd data and save the
// revision to then feed it with the etcd events
func (r *ReadDB) Initialize(ctx context.Context) error {
// sync the rdb
if err := r.SyncRDB(ctx); err != nil {
return errors.Wrapf(err, "error syncing db")
}
return nil
}
func (r *ReadDB) ResetDB(ctx context.Context) error {
// TODO(sgotti) this needs to be protected by a mutex
if r.rdb != nil {
r.rdb.Close()
}
// drop rdb
if err := os.Remove(filepath.Join(r.dataDir, "db")); err != nil {
return errors.WithStack(err)
}
rdb, err := db.NewDB(db.Sqlite3, filepath.Join(r.dataDir, "db"))
if err != nil {
return errors.WithStack(err)
}
// populate readdb
if err := rdb.Create(ctx, Stmts); err != nil {
return errors.WithStack(err)
}
r.rdb = rdb
return nil
}
func (r *ReadDB) SyncFromDump(ctx context.Context) (string, error) {
dumpIndex, err := r.dm.GetLastDataStatus()
if err != nil {
return "", errors.WithStack(err)
}
for dataType, files := range dumpIndex.Files {
for _, file := range files {
dumpf, err := r.ost.ReadObject(r.dm.DataFilePath(dataType, file.ID))
if err != nil {
return "", errors.WithStack(err)
}
dumpEntries := []*datamanager.DataEntry{}
dec := json.NewDecoder(dumpf)
for {
var de *datamanager.DataEntry
err := dec.Decode(&de)
if errors.Is(err, io.EOF) {
// all done
break
}
if err != nil {
dumpf.Close()
return "", errors.WithStack(err)
}
dumpEntries = append(dumpEntries, de)
}
dumpf.Close()
err = r.rdb.Do(ctx, func(tx *db.Tx) error {
for _, de := range dumpEntries {
action := &datamanager.Action{
ActionType: datamanager.ActionTypePut,
ID: de.ID,
DataType: dataType,
Data: de.Data,
}
if err := r.applyAction(tx, action); err != nil {
return errors.WithStack(err)
}
}
return nil
})
if err != nil {
return "", errors.WithStack(err)
}
}
}
err = r.rdb.Do(ctx, func(tx *db.Tx) error {
if err := r.insertCommittedWalSequence(tx, dumpIndex.WalSequence); err != nil {
return errors.WithStack(err)
}
return nil
})
if err != nil {
return "", errors.WithStack(err)
}
return dumpIndex.WalSequence, nil
}
func (r *ReadDB) SyncFromWals(ctx context.Context, startWalSeq, endWalSeq string) (string, error) {
insertfunc := func(walFiles []*datamanager.WalFile) error {
err := r.rdb.Do(ctx, func(tx *db.Tx) error {
for _, walFile := range walFiles {
header, err := r.dm.ReadWal(walFile.WalSequence)
if err != nil {
return errors.WithStack(err)
}
if err := r.insertCommittedWalSequence(tx, walFile.WalSequence); err != nil {
return errors.WithStack(err)
}
if err := r.applyWal(tx, header.WalDataFileID); err != nil {
return errors.WithStack(err)
}
}
return nil
})
return errors.WithStack(err)
}
lastWalSeq := startWalSeq
walFiles := []*datamanager.WalFile{}
count := 0
doneCh := make(chan struct{})
defer close(doneCh)
for walFile := range r.dm.ListOSTWals(startWalSeq) {
if walFile.Err != nil {
return "", errors.WithStack(walFile.Err)
}
walFiles = append(walFiles, walFile)
lastWalSeq = walFile.WalSequence
if count > 100 {
if err := insertfunc(walFiles); err != nil {
return "", errors.WithStack(err)
}
count = 0
walFiles = []*datamanager.WalFile{}
} else {
count++
}
}
if err := insertfunc(walFiles); err != nil {
return "", errors.WithStack(err)
}
return lastWalSeq, nil
}
func (r *ReadDB) SyncRDB(ctx context.Context) error {
// get the last committed storage wal sequence saved in the rdb
curWalSeq := ""
err := r.rdb.Do(ctx, func(tx *db.Tx) error {
var err error
curWalSeq, err = r.GetCommittedWalSequence(tx)
if err != nil {
return errors.WithStack(err)
}
return nil
})
if err != nil {
return errors.WithStack(err)
}
lastCommittedStorageWal, _, err := r.dm.LastCommittedStorageWal(ctx)
if err != nil {
return errors.WithStack(err)
}
doFullSync := false
if curWalSeq == "" {
doFullSync = true
r.log.Warn().Msgf("no startWalSeq in db, doing a full sync")
} else {
ok, err := r.dm.HasOSTWal(curWalSeq)
if err != nil {
return errors.WithStack(err)
}
if !ok {
r.log.Warn().Msgf("no wal with seq %q in objectstorage, doing a full sync", curWalSeq)
doFullSync = true
}
// if the epoch of the wals has changed this means etcd has been reset. If so
// we should do a full resync since we are saving in the rdb also data that
// was not yet committed to objectstorage so we should have the rdb ahead of
// the current objectstorage data
// TODO(sgotti) improve this to avoid doing a full resync
curWalSequence, err := sequence.Parse(curWalSeq)
if err != nil {
return errors.WithStack(err)
}
curWalEpoch := curWalSequence.Epoch
lastCommittedStorageWalSequence, err := sequence.Parse(lastCommittedStorageWal)
if err != nil {
return errors.WithStack(err)
}
if curWalEpoch != lastCommittedStorageWalSequence.Epoch {
r.log.Warn().Msgf("current rdb wal sequence epoch %d different than new wal sequence epoch %d, doing a full sync", curWalEpoch, lastCommittedStorageWalSequence.Epoch)
doFullSync = true
}
}
if doFullSync {
r.log.Info().Msgf("doing a full sync from dump")
if err := r.ResetDB(ctx); err != nil {
return errors.WithStack(err)
}
var err error
curWalSeq, err = r.SyncFromDump(ctx)
if err != nil {
return errors.WithStack(err)
}
}
r.log.Debug().Msgf("startWalSeq: %s", curWalSeq)
// Sync from wals
// sync from objectstorage until the current known lastCommittedStorageWal in
// etcd since wals are first committed to objectstorage and then in etcd we
// would like to avoid to store in rdb something that is not yet marked as
// committedstorage in etcd
curWalSeq, err = r.SyncFromWals(ctx, curWalSeq, lastCommittedStorageWal)
if err != nil {
return errors.Wrapf(err, "failed to sync from wals")
}
// Get the first available wal from etcd and check that our current walseq
// from wals on objectstorage is >=
// if not (this happens when syncFromWals takes some time and in the meantime
// many new wals are written, the next sync should be faster and able to continue
firstAvailableWalData, revision, err := r.dm.FirstAvailableWalData(ctx)
if err != nil {
return errors.Wrapf(err, "failed to get first available wal data")
}
r.log.Debug().Msgf("firstAvailableWalData: %s", util.Dump(firstAvailableWalData))
r.log.Debug().Msgf("revision: %d", revision)
if firstAvailableWalData == nil {
return errors.Errorf("no wal data in etcd")
}
if curWalSeq < firstAvailableWalData.WalSequence {
return errors.Errorf("current applied wal seq %q is smaller than the first available wal in etcd %q", curWalSeq, firstAvailableWalData.WalSequence)
}
r.log.Info().Msgf("syncing from wals")
err = r.rdb.Do(ctx, func(tx *db.Tx) error {
if err := r.insertRevision(tx, revision); err != nil {
return errors.WithStack(err)
}
// use the same revision as previous operation
for walElement := range r.dm.ListEtcdWals(ctx, revision) {
if walElement.Err != nil {
return errors.WithStack(walElement.Err)
}
if walElement.WalData.WalSequence <= curWalSeq {
continue
}
// update readdb only when the wal has been committed to etcd
if walElement.WalData.WalStatus != datamanager.WalStatusCommitted {
return nil
}
if err := r.insertCommittedWalSequence(tx, walElement.WalData.WalSequence); err != nil {
return errors.WithStack(err)
}
r.log.Debug().Msgf("applying wal to db")
if err := r.applyWal(tx, walElement.WalData.WalDataFileID); err != nil {
return errors.WithStack(err)
}
}
// sync changegroups, use the same revision of previous operations
changeGroupsRevisions, err := r.dm.ListEtcdChangeGroups(ctx, revision)
if err != nil {
return errors.WithStack(err)
}
for changeGroupID, changeGroupRevision := range changeGroupsRevisions {
if err := r.insertChangeGroupRevision(tx, changeGroupID, changeGroupRevision); err != nil {
return errors.WithStack(err)
}
}
return nil
})
return errors.WithStack(err)
}
func (r *ReadDB) Run(ctx context.Context) error {
if r.rdb != nil {
r.rdb.Close()
}
rdb, err := db.NewDB(db.Sqlite3, filepath.Join(r.dataDir, "db"))
if err != nil {
return errors.WithStack(err)
}
r.rdb = rdb
// populate readdb
if err := r.rdb.Create(ctx, Stmts); err != nil {
return errors.WithStack(err)
}
revision, err := r.GetRevision(ctx)
if err != nil {
return errors.WithStack(err)
}
if revision == 0 || !r.Initialized {
for {
err := r.Initialize(ctx)
if err == nil {
break
}
r.log.Err(err).Msgf("initialize err")
sleepCh := time.NewTimer(1 * time.Second).C
select {
case <-ctx.Done():
return nil
case <-sleepCh:
}
}
}
r.SetInitialized(true)
for {
for {
initialized := r.IsInitialized()
if initialized {
break
}
err := r.Initialize(ctx)
if err == nil {
r.SetInitialized(true)
break
}
r.log.Err(err).Msgf("initialize err")
sleepCh := time.NewTimer(1 * time.Second).C
select {
case <-ctx.Done():
return nil
case <-sleepCh:
}
}
doneCh := make(chan struct{}, 2)
hctx, cancel := context.WithCancel(ctx)
wg := &sync.WaitGroup{}
wg.Add(1)
go func() {
r.log.Info().Msgf("starting handleEvents")
if err := r.handleEvents(hctx); err != nil {
r.log.Err(err).Msgf("handleEvents err")
}
wg.Done()
doneCh <- struct{}{}
}()
select {
case <-ctx.Done():
r.log.Info().Msgf("readdb exiting")
cancel()
return nil
case <-doneCh:
// cancel context and wait for the all the goroutines to exit
cancel()
wg.Wait()
}
sleepCh := time.NewTimer(1 * time.Second).C
select {
case <-ctx.Done():
return nil
case <-sleepCh:
}
}
}
// TODO(sgotti) improve to apply when the wal have been "committedstorage" and
// not only "committed", in this way we don't have to full resync when etcd is
// lost/reset
func (r *ReadDB) handleEvents(ctx context.Context) error {
var revision int64
err := r.rdb.Do(ctx, func(tx *db.Tx) error {
err := tx.QueryRow("select revision from revision order by revision desc limit 1").Scan(&revision)
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
revision = 0
} else {
return errors.WithStack(err)
}
}
return nil
})
if err != nil {
return errors.WithStack(err)
}
wctx, cancel := context.WithCancel(ctx)
defer cancel()
r.log.Debug().Msgf("revision: %d", revision)
wch := r.dm.Watch(wctx, revision+1)
for we := range wch {
r.log.Debug().Msgf("we: %s", util.Dump(we))
if we.Err != nil {
err := we.Err
if errors.Is(err, datamanager.ErrCompacted) {
r.log.Warn().Msgf("required events already compacted, reinitializing readdb")
r.Initialized = false
return nil
}
return errors.Wrapf(err, "watch error")
}
// a single transaction for every response (every response contains all the
// events happened in an etcd revision).
err = r.rdb.Do(ctx, func(tx *db.Tx) error {
// if theres a wal seq epoch change something happened to etcd, usually (if
// the user hasn't messed up with etcd keys) this means etcd has been reset
// in such case we should resync from the objectstorage state to ensure we
// apply all the wal marked as committedstorage (since they could have been
// lost from etcd)
curWalSeq, err := r.GetCommittedWalSequence(tx)
if err != nil {
return errors.WithStack(err)
}
r.log.Debug().Msgf("curWalSeq: %q", curWalSeq)
if curWalSeq != "" && we.WalData != nil {
curWalSequence, err := sequence.Parse(curWalSeq)
if err != nil {
return errors.WithStack(err)
}
curWalEpoch := curWalSequence.Epoch
weWalSequence, err := sequence.Parse(we.WalData.WalSequence)
if err != nil {
return errors.WithStack(err)
}
r.log.Debug().Msgf("we.WalData.WalSequence: %q", we.WalData.WalSequence)
weWalEpoch := weWalSequence.Epoch
if curWalEpoch != weWalEpoch {
r.Initialized = false
return errors.Errorf("current rdb wal sequence epoch %d different than new wal sequence epoch %d, resyncing from objectstorage", curWalEpoch, weWalEpoch)
}
}
if err := r.handleEvent(tx, we); err != nil {
return errors.WithStack(err)
}
if err := r.insertRevision(tx, we.Revision); err != nil {
return errors.WithStack(err)
}
return nil
})
if err != nil {
return errors.WithStack(err)
}
}
r.log.Info().Msgf("wch closed")
return nil
}
func (r *ReadDB) handleEvent(tx *db.Tx, we *datamanager.WatchElement) error {
//r.log.Debug().Msgf("event: %s %q : %q\n", ev.Type, ev.Kv.Key, ev.Kv.Value)
//key := string(ev.Kv.Key)
if err := r.handleWalEvent(tx, we); err != nil {
return errors.WithStack(err)
}
return nil
}
func (r *ReadDB) handleWalEvent(tx *db.Tx, we *datamanager.WatchElement) error {
for cgName, cgRev := range we.ChangeGroupsRevisions {
if err := r.insertChangeGroupRevision(tx, cgName, cgRev); err != nil {
return errors.WithStack(err)
}
}
if we.WalData != nil {
// update readdb only when the wal has been committed to etcd
if we.WalData.WalStatus != datamanager.WalStatusCommitted {
return nil
}
if err := r.insertCommittedWalSequence(tx, we.WalData.WalSequence); err != nil {
return errors.WithStack(err)
}
r.log.Debug().Msgf("applying wal to db")
return r.applyWal(tx, we.WalData.WalDataFileID)
}
return nil
}
func (r *ReadDB) applyWal(tx *db.Tx, walDataFileID string) error {
walFile, err := r.dm.ReadWalData(walDataFileID)
if err != nil {
return errors.Wrapf(err, "cannot read wal data file %q", walDataFileID)
}
defer walFile.Close()
dec := json.NewDecoder(walFile)
for {
var action *datamanager.Action
err := dec.Decode(&action)
if errors.Is(err, io.EOF) {
// all done
break
}
if err != nil {
return errors.Wrapf(err, "failed to decode wal file")
}
if err := r.applyAction(tx, action); err != nil {
return errors.WithStack(err)
}
}
return nil
}
func (r *ReadDB) applyAction(tx *db.Tx, action *datamanager.Action) error {
switch action.ActionType {
case datamanager.ActionTypePut:
switch types.ConfigType(action.DataType) {
case types.ConfigTypeUser:
if err := r.insertUser(tx, action.Data); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeOrg:
if err := r.insertOrg(tx, action.Data); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeOrgMember:
if err := r.insertOrgMember(tx, action.Data); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeProjectGroup:
if err := r.insertProjectGroup(tx, action.Data); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeProject:
if err := r.insertProject(tx, action.Data); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeRemoteSource:
if err := r.insertRemoteSource(tx, action.Data); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeSecret:
if err := r.insertSecret(tx, action.Data); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeVariable:
if err := r.insertVariable(tx, action.Data); err != nil {
return errors.WithStack(err)
}
}
case datamanager.ActionTypeDelete:
switch types.ConfigType(action.DataType) {
case types.ConfigTypeUser:
r.log.Debug().Msgf("deleting user with id: %s", action.ID)
if err := r.deleteUser(tx, action.ID); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeOrg:
r.log.Debug().Msgf("deleting org with id: %s", action.ID)
if err := r.deleteOrg(tx, action.ID); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeOrgMember:
r.log.Debug().Msgf("deleting orgmember with id: %s", action.ID)
if err := r.deleteOrgMember(tx, action.ID); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeProjectGroup:
r.log.Debug().Msgf("deleting project group with id: %s", action.ID)
if err := r.deleteProjectGroup(tx, action.ID); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeProject:
r.log.Debug().Msgf("deleting project with id: %s", action.ID)
if err := r.deleteProject(tx, action.ID); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeRemoteSource:
r.log.Debug().Msgf("deleting remote source with id: %s", action.ID)
if err := r.deleteRemoteSource(tx, action.ID); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeSecret:
r.log.Debug().Msgf("deleting secret with id: %s", action.ID)
if err := r.deleteSecret(tx, action.ID); err != nil {
return errors.WithStack(err)
}
case types.ConfigTypeVariable:
r.log.Debug().Msgf("deleting variable with id: %s", action.ID)
if err := r.deleteVariable(tx, action.ID); err != nil {
return errors.WithStack(err)
}
}
}
return nil
}
func (r *ReadDB) Do(ctx context.Context, f func(tx *db.Tx) error) error {
return errors.WithStack(r.rdb.Do(ctx, f))
}
func (r *ReadDB) insertRevision(tx *db.Tx, revision int64) error {
// poor man insert or update that works because transaction isolation level is serializable
if _, err := tx.Exec("delete from revision"); err != nil {
return errors.Wrapf(err, "failed to delete revision")
}
// TODO(sgotti) go database/sql and mattn/sqlite3 don't support uint64 types...
q, args, err := revisionInsert.Values(revision).ToSql()
if err != nil {
return errors.Wrapf(err, "failed to build query")
}
if _, err = tx.Exec(q, args...); err != nil {
return errors.WithStack(err)
}
return nil
}
func (r *ReadDB) GetRevision(ctx context.Context) (int64, error) {
var revision int64
err := r.rdb.Do(ctx, func(tx *db.Tx) error {
var err error
revision, err = r.getRevision(tx)
return errors.WithStack(err)
})
return revision, errors.WithStack(err)
}
func (r *ReadDB) getRevision(tx *db.Tx) (int64, error) {
var revision int64
q, args, err := revisionSelect.ToSql()
r.log.Debug().Msgf("q: %s, args: %s", q, util.Dump(args))
if err != nil {
return 0, errors.Wrapf(err, "failed to build query")
}
err = tx.QueryRow(q, args...).Scan(&revision)
if errors.Is(err, sql.ErrNoRows) {
return 0, nil
}
return revision, errors.WithStack(err)
}
func (r *ReadDB) insertCommittedWalSequence(tx *db.Tx, seq string) error {
r.log.Debug().Msgf("insert seq: %s", seq)
// poor man insert or update that works because transaction isolation level is serializable
if _, err := tx.Exec("delete from committedwalsequence"); err != nil {
return errors.Wrapf(err, "failed to delete committedwalsequence")
}
q, args, err := committedwalsequenceInsert.Values(seq).ToSql()
if err != nil {
return errors.Wrapf(err, "failed to build query")
}
if _, err = tx.Exec(q, args...); err != nil {
return errors.WithStack(err)
}
return nil
}
func (r *ReadDB) GetCommittedWalSequence(tx *db.Tx) (string, error) {
var seq string
q, args, err := committedwalsequenceSelect.OrderBy("seq").Limit(1).ToSql()
r.log.Debug().Msgf("q: %s, args: %s", q, util.Dump(args))
if err != nil {
return "", errors.Wrapf(err, "failed to build query")
}
err = tx.QueryRow(q, args...).Scan(&seq)
if errors.Is(err, sql.ErrNoRows) {
return "", nil
}
return seq, errors.WithStack(err)
}
func (r *ReadDB) insertChangeGroupRevision(tx *db.Tx, changegroup string, revision int64) error {
r.log.Debug().Msgf("insertChangeGroupRevision: %s %d", changegroup, revision)
// poor man insert or update that works because transaction isolation level is serializable
if _, err := tx.Exec("delete from changegrouprevision where id = $1", changegroup); err != nil {
return errors.Wrapf(err, "failed to delete run")
}
// insert only if revision > 0
if revision > 0 {
q, args, err := changegrouprevisionInsert.Values(changegroup, revision).ToSql()
if err != nil {
return errors.Wrapf(err, "failed to build query")
}
if _, err = tx.Exec(q, args...); err != nil {
return errors.WithStack(err)
}
}
return nil
}
func (r *ReadDB) GetChangeGroupsUpdateTokens(tx *db.Tx, groups []string) (*datamanager.ChangeGroupsUpdateToken, error) {
s := changegrouprevisionSelect.Where(sq.Eq{"id": groups})
q, args, err := s.ToSql()
r.log.Debug().Msgf("q: %s, args: %s", q, util.Dump(args))
if err != nil {
return nil, errors.Wrapf(err, "failed to build query")
}
cgr, err := fetchChangeGroupsRevision(tx, q, args...)
if err != nil {
return nil, errors.WithStack(err)
}
revision, err := r.getRevision(tx)
if err != nil {
return nil, errors.WithStack(err)
}
// for non existing changegroups use a changegroup with revision = 0
for _, g := range groups {
if _, ok := cgr[g]; !ok {
cgr[g] = 0
}
}
return &datamanager.ChangeGroupsUpdateToken{CurRevision: revision, ChangeGroupsRevisions: cgr}, nil
}
func fetchChangeGroupsRevision(tx *db.Tx, q string, args ...interface{}) (map[string]int64, error) {
rows, err := tx.Query(q, args...)
if err != nil {
return nil, errors.WithStack(err)
}
defer rows.Close()
return scanChangeGroupsRevision(rows)
}
func scanChangeGroupsRevision(rows *sql.Rows) (map[string]int64, error) {
changegroups := map[string]int64{}
for rows.Next() {
var (
id string
revision int64
)
if err := rows.Scan(&id, &revision); err != nil {
return nil, errors.Wrapf(err, "failed to scan rows")
}
changegroups[id] = revision
}
if err := rows.Err(); err != nil {
return nil, errors.WithStack(err)
}
return changegroups, nil
}