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messagestore.go
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messagestore.go
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// Copyright 2017 Google Inc.
//
// 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
//
// https://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 sqlite
import (
"context"
"database/sql"
"encoding/hex"
"errors"
"fmt"
"strconv"
"strings"
"time"
log "github.com/golang/glog"
"github.com/google/fleetspeak/fleetspeak/src/common"
"github.com/google/fleetspeak/fleetspeak/src/server/db"
fspb "github.com/google/fleetspeak/fleetspeak/src/common/proto/fleetspeak"
"google.golang.org/protobuf/proto"
anypb "google.golang.org/protobuf/types/known/anypb"
tspb "google.golang.org/protobuf/types/known/timestamppb"
)
// dbMessage matches the schema of the messages table, optionally joined to the
// pending_messages table.
type dbMessage struct {
messageID string
sourceClientID string
sourceServiceName string
sourceMessageID string
destinationClientID string
destinationServiceName string
messageType string
creationTimeSeconds int64
creationTimeNanos int32
processedTimeSeconds sql.NullInt64
processedTimeNanos sql.NullInt64
validationInfo []byte
failed sql.NullBool
failedReason sql.NullString
retryCount uint32
dataTypeURL sql.NullString
dataValue []byte
annotations []byte
}
func toMicro(t time.Time) int64 {
return t.UnixNano() / 1000
}
func (d *Datastore) SetMessageResult(ctx context.Context, dest common.ClientID, id common.MessageID, res *fspb.MessageResult) error {
d.l.Lock()
defer d.l.Unlock()
return d.runInTx(func(tx *sql.Tx) error { return d.trySetMessageResult(ctx, tx, id, res) })
}
func (d *Datastore) trySetMessageResult(ctx context.Context, tx *sql.Tx, id common.MessageID, res *fspb.MessageResult) error {
dbm := dbMessage{
messageID: id.String(),
processedTimeSeconds: sql.NullInt64{Valid: true, Int64: res.ProcessedTime.Seconds},
processedTimeNanos: sql.NullInt64{Valid: true, Int64: int64(res.ProcessedTime.Nanos)},
}
if res.Failed {
dbm.failed = sql.NullBool{Valid: true, Bool: true}
dbm.failedReason = sql.NullString{Valid: true, String: res.FailedReason}
}
_, err := tx.ExecContext(ctx, "UPDATE messages SET failed=?, failed_reason=?, processed_time_seconds=?, processed_time_nanos=? WHERE message_id=?",
dbm.failed, dbm.failedReason, dbm.processedTimeSeconds, dbm.processedTimeNanos, dbm.messageID)
if err != nil {
return err
}
_, err = tx.ExecContext(ctx, "DELETE FROM pending_messages WHERE message_id=?", dbm.messageID)
return err
}
func toClientIDString(b []byte) string {
if len(b) == 0 {
return ""
}
id, err := common.BytesToClientID(b)
if err != nil {
log.Fatalf("Could't parse ClientID(%v): %v", b, err)
}
return id.String()
}
func fromClientIDString(s string) (b []byte) {
if s == "" {
return nil
}
cid, err := common.StringToClientID(s)
if err != nil {
log.Fatalf("Couldn't parse ClientID(%v): %v", s, err)
return nil
}
return cid.Bytes()
}
func fromNULLString(s sql.NullString) string {
if !s.Valid {
return ""
}
return s.String
}
func fromMessageProto(m *fspb.Message) (*dbMessage, error) {
id, err := common.BytesToMessageID(m.MessageId)
if err != nil {
return nil, err
}
dbm := &dbMessage{
messageID: id.String(),
messageType: m.MessageType,
}
if m.Source != nil {
dbm.sourceClientID = toClientIDString(m.Source.ClientId)
dbm.sourceServiceName = m.Source.ServiceName
}
if m.Destination != nil {
dbm.destinationClientID = toClientIDString(m.Destination.ClientId)
dbm.destinationServiceName = m.Destination.ServiceName
}
if len(m.SourceMessageId) != 0 {
dbm.sourceMessageID = hex.EncodeToString(m.SourceMessageId)
}
if m.CreationTime != nil {
dbm.creationTimeSeconds = m.CreationTime.Seconds
dbm.creationTimeNanos = m.CreationTime.Nanos
}
if m.Result != nil {
r := m.Result
if r.ProcessedTime != nil {
dbm.processedTimeSeconds = sql.NullInt64{Int64: r.ProcessedTime.Seconds, Valid: true}
dbm.processedTimeNanos = sql.NullInt64{Int64: int64(r.ProcessedTime.Nanos), Valid: true}
}
if r.Failed {
dbm.failed = sql.NullBool{Bool: true, Valid: true}
dbm.failedReason = sql.NullString{String: r.FailedReason, Valid: true}
}
}
if m.Data != nil {
dbm.dataTypeURL = sql.NullString{String: m.Data.TypeUrl, Valid: true}
dbm.dataValue = m.Data.Value
}
if m.ValidationInfo != nil {
b, err := proto.Marshal(m.ValidationInfo)
if err != nil {
return nil, err
}
dbm.validationInfo = b
}
if m.Annotations != nil {
b, err := proto.Marshal(m.Annotations)
if err != nil {
return nil, err
}
dbm.annotations = b
}
return dbm, nil
}
func toMessageResultProto(m *dbMessage) *fspb.MessageResult {
if !m.processedTimeSeconds.Valid {
return nil
}
ret := &fspb.MessageResult{
ProcessedTime: &tspb.Timestamp{
Seconds: m.processedTimeSeconds.Int64,
Nanos: int32(m.processedTimeNanos.Int64)},
Failed: m.failed.Valid && m.failed.Bool,
}
if m.failedReason.Valid {
ret.FailedReason = m.failedReason.String
}
return ret
}
func toMessageProto(m *dbMessage) (*fspb.Message, error) {
mid, err := common.StringToMessageID(m.messageID)
if err != nil {
return nil, err
}
bsmid, err := hex.DecodeString(m.sourceMessageID)
if err != nil {
return nil, err
}
pm := &fspb.Message{
MessageId: mid.Bytes(),
Source: &fspb.Address{
ClientId: fromClientIDString(m.sourceClientID),
ServiceName: m.sourceServiceName,
},
SourceMessageId: bsmid,
Destination: &fspb.Address{
ClientId: fromClientIDString(m.destinationClientID),
ServiceName: m.destinationServiceName,
},
MessageType: m.messageType,
CreationTime: &tspb.Timestamp{
Seconds: m.creationTimeSeconds,
Nanos: m.creationTimeNanos,
},
Result: toMessageResultProto(m),
}
if m.dataTypeURL.Valid {
pm.Data = &anypb.Any{
TypeUrl: m.dataTypeURL.String,
Value: m.dataValue,
}
}
if len(m.validationInfo) > 0 {
v := &fspb.ValidationInfo{}
if err := proto.Unmarshal(m.validationInfo, v); err != nil {
return nil, err
}
pm.ValidationInfo = v
}
if len(m.annotations) > 0 {
a := &fspb.Annotations{}
if err := proto.Unmarshal(m.annotations, a); err != nil {
return nil, err
}
pm.Annotations = a
}
return pm, nil
}
func (d *Datastore) StoreMessages(ctx context.Context, msgs []*fspb.Message, contact db.ContactID) error {
d.l.Lock()
defer d.l.Unlock()
ids := make([]string, 0, len(msgs))
return d.runInTx(func(tx *sql.Tx) error {
for _, m := range msgs {
dbm, err := fromMessageProto(m)
if err != nil {
return err
}
// If it is already processed, we don't want to save m.Data.
if m.Result != nil {
dbm.dataTypeURL = sql.NullString{Valid: false}
dbm.dataValue = nil
}
ids = append(ids, dbm.messageID)
if m.Result != nil && !m.Result.Failed {
if err := d.tryStoreMessage(ctx, tx, dbm, false); err != nil {
return err
}
if m.Result != nil {
mid, _ := common.BytesToMessageID(m.MessageId)
if err := d.trySetMessageResult(ctx, tx, mid, m.Result); err != nil {
return err
}
}
continue
}
var processedTime sql.NullInt64
var failed sql.NullBool
e := tx.QueryRowContext(ctx, "SELECT processed_time_seconds, failed FROM messages where message_id=?", dbm.messageID).Scan(&processedTime, &failed)
switch {
case e == sql.ErrNoRows:
// Common case. Message not yet present, store as normal.
if err := d.tryStoreMessage(ctx, tx, dbm, false); err != nil {
return err
}
case e != nil:
return e
case processedTime.Valid && (!failed.Valid || !failed.Bool):
// Message previously successfully processed, ignore this reprocessing.
case m.Result != nil && (!processedTime.Valid || !m.Result.Failed):
mid, err := common.BytesToMessageID(m.MessageId)
if err != nil {
return err
}
// Message not previously successfully processed, but this try succeeded. Mark as processed.
if err := d.trySetMessageResult(ctx, tx, mid, m.Result); err != nil {
return err
}
default:
// The message is already present, but unprocessed/failed, and this
// processing didn't succeed or is ongoing. Nothing to do.
}
}
if contact == "" {
return nil
}
c, err := strconv.ParseUint(string(contact), 16, 64)
if err != nil {
e := fmt.Errorf("unable to parse ContactID [%v]: %v", contact, err)
log.Error(e)
return e
}
for _, id := range ids {
if _, err := tx.ExecContext(ctx, "INSERT OR IGNORE INTO client_contact_messages(client_contact_id, message_id) VALUES (?, ?)", c, id); err != nil {
return err
}
}
return nil
})
}
func (d *Datastore) tryStoreMessage(ctx context.Context, tx *sql.Tx, dbm *dbMessage, isBroadcast bool) error {
if dbm.creationTimeSeconds == 0 {
return errors.New("message CreationTime must be set")
}
res, err := tx.ExecContext(ctx, "INSERT OR IGNORE INTO messages("+
"message_id, "+
"source_client_id, "+
"source_service_name, "+
"source_message_id, "+
"destination_client_id, "+
"destination_service_name, "+
"message_type, "+
"creation_time_seconds, "+
"creation_time_nanos, "+
"processed_time_seconds, "+
"processed_time_nanos, "+
"failed,"+
"failed_reason,"+
"validation_info,"+
"annotations) VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
dbm.messageID,
dbm.sourceClientID,
dbm.sourceServiceName,
dbm.sourceMessageID,
dbm.destinationClientID,
dbm.destinationServiceName,
dbm.messageType,
dbm.creationTimeSeconds,
dbm.creationTimeNanos,
dbm.processedTimeSeconds,
dbm.processedTimeNanos,
dbm.failed,
dbm.failedReason,
dbm.validationInfo,
dbm.annotations)
if err != nil {
return err
}
cnt, err := res.RowsAffected()
if err != nil {
return err
}
inserted := cnt == 1
if inserted && !dbm.processedTimeSeconds.Valid {
var due int64
if dbm.destinationClientID == "" {
due = toMicro(db.ServerRetryTime(0))
} else {
// If this is being created in response to a broadcast, then we about to
// hand it to the client and should wait before providing in through
// ClientMessagesForProcessing. Otherwise, we should give it to the client
// on next contact.
if isBroadcast {
due = toMicro(db.ClientRetryTime())
} else {
due = toMicro(db.Now())
}
}
_, err = tx.ExecContext(ctx, "INSERT INTO pending_messages("+
"message_id, "+
"retry_count, "+
"scheduled_time, "+
"data_type_url, "+
"data_value) VALUES(?, ?, ?, ?, ?)",
dbm.messageID,
0,
due,
dbm.dataTypeURL,
dbm.dataValue)
if err != nil {
return err
}
}
return nil
}
func genPlaceholders(num int) string {
es := make([]string, num)
for i := range es {
es[i] = "?"
}
return strings.Join(es, ", ")
}
func (d *Datastore) getPendingMessageRawIds(ctx context.Context, tx *sql.Tx, ids []common.ClientID, offset uint64, limit uint64) ([]string, error) {
squery := fmt.Sprintf("SELECT "+
"m.message_id AS message_id "+
"FROM messages AS m, pending_messages AS pm "+
"WHERE m.destination_client_id IN (%s) AND m.message_id=pm.message_id "+
"ORDER BY message_id ",
genPlaceholders((len(ids))))
if offset != 0 && limit == 0 {
return nil, fmt.Errorf("if offset is provided, a limit must be provided as well")
}
if limit != 0 {
squery += " LIMIT ?"
}
if offset != 0 {
squery += " OFFSET ?"
}
args := make([]any, len(ids), len(ids)+2)
for i, v := range ids {
args[i] = v.String()
}
if limit != 0 {
args = append(args, limit)
}
if offset != 0 {
args = append(args, offset)
}
idsToProc := make([]string, 0)
rs, err := tx.QueryContext(ctx, squery, args...)
if err != nil {
return nil, fmt.Errorf("Failed to fetch the list of messages to delete: %v", err)
}
defer rs.Close()
for rs.Next() {
var id string
if err := rs.Scan(&id); err != nil {
return nil, err
}
idsToProc = append(idsToProc, id)
}
return idsToProc, nil
}
func (d *Datastore) GetPendingMessageCount(ctx context.Context, ids []common.ClientID) (uint64, error) {
var result uint64
err := d.runInTx(func(tx *sql.Tx) error {
squery := fmt.Sprintf("SELECT "+
"COUNT(*) "+
"FROM messages AS m, pending_messages AS pm "+
"WHERE m.destination_client_id IN (%s) AND m.message_id=pm.message_id ",
genPlaceholders((len(ids))))
args := make([]any, len(ids))
for i, v := range ids {
args[i] = v.String()
}
rs, err := tx.QueryContext(ctx, squery, args...)
if err != nil {
return fmt.Errorf("Failed to fetch the pending message count: %v", err)
}
defer rs.Close()
if !rs.Next() {
return fmt.Errorf("Got empty result")
}
err = rs.Scan(&result)
if err != nil {
return fmt.Errorf("Failed to scan result: %v", err)
}
return nil
})
return result, err
}
func (d *Datastore) GetPendingMessages(ctx context.Context, ids []common.ClientID, offset uint64, limit uint64, wantData bool) ([]*fspb.Message, error) {
var res []*fspb.Message
err := d.runInTx(func(tx *sql.Tx) error {
messageIdsRaw, err := d.getPendingMessageRawIds(ctx, tx, ids, offset, limit)
if err != nil {
return err
}
var messageIds []common.MessageID
for _, idRaw := range messageIdsRaw {
messageID, err := common.StringToMessageID(idRaw)
if err != nil {
return err
}
messageIds = append(messageIds, messageID)
}
res, err = d.getMessages(ctx, tx, messageIds, wantData)
return err
})
return res, err
}
func (d *Datastore) DeletePendingMessages(ctx context.Context, ids []common.ClientID) error {
return d.runInTx(func(tx *sql.Tx) error {
messageIds, err := d.getPendingMessageRawIds(ctx, tx, ids, 0, 0)
if err != nil {
return err
}
idsToProc := make([]any, len(messageIds))
for i, id := range messageIds {
idsToProc[i] = id
}
// If there are no messages to be deleted, just bail out.
if len(idsToProc) == 0 {
return nil
}
now := db.NowProto()
ptimeSecs := sql.NullInt64{Valid: true, Int64: now.Seconds}
ptimeNanoSecs := sql.NullInt64{Valid: true, Int64: int64(now.Nanos)}
failed := sql.NullBool{Valid: true, Bool: true}
failedReason := sql.NullString{Valid: true, String: "Removed by admin action."}
ps := genPlaceholders(len(idsToProc))
uquery := fmt.Sprintf("UPDATE messages SET failed=?, failed_reason=?, processed_time_seconds=?, processed_time_nanos=? WHERE message_id IN (%s)", ps)
_, err = tx.ExecContext(ctx, uquery, append([]any{failed, failedReason, ptimeSecs, ptimeNanoSecs}, idsToProc...)...)
if err != nil {
return err
}
dquery := fmt.Sprintf("DELETE FROM pending_messages WHERE message_id IN (%s)", ps)
_, err = tx.ExecContext(ctx, dquery, idsToProc...)
return err
})
}
func (d *Datastore) getMessages(ctx context.Context, tx *sql.Tx, ids []common.MessageID, wantData bool) ([]*fspb.Message, error) {
d.l.Lock()
defer d.l.Unlock()
res := make([]*fspb.Message, 0, len(ids))
stmt1, err := tx.Prepare("SELECT " +
"message_id, " +
"source_client_id, " +
"source_service_name, " +
"source_message_id, " +
"destination_client_id, " +
"destination_service_name, " +
"message_type, " +
"creation_time_seconds, " +
"creation_time_nanos, " +
"processed_time_seconds, " +
"processed_time_nanos, " +
"validation_info, " +
"annotations " +
"FROM messages WHERE message_id=?")
var stmt2 *sql.Stmt
if wantData {
stmt2, err = tx.Prepare("SELECT data_type_url, data_value FROM pending_messages WHERE message_id=?")
if err != nil {
return nil, err
}
}
if err != nil {
return nil, err
}
for _, id := range ids {
row := stmt1.QueryRowContext(ctx, id.String())
var dbm dbMessage
err := row.Scan(
&dbm.messageID,
&dbm.sourceClientID,
&dbm.sourceServiceName,
&dbm.sourceMessageID,
&dbm.destinationClientID,
&dbm.destinationServiceName,
&dbm.messageType,
&dbm.creationTimeSeconds,
&dbm.creationTimeNanos,
&dbm.processedTimeSeconds,
&dbm.processedTimeNanos,
&dbm.validationInfo,
&dbm.annotations)
if err != nil {
return nil, err
}
if wantData {
row := stmt2.QueryRowContext(ctx, id.String())
err := row.Scan(&dbm.dataTypeURL, &dbm.dataValue)
if err != nil && err != sql.ErrNoRows {
return nil, err
}
}
m, err := toMessageProto(&dbm)
if err != nil {
return nil, err
}
res = append(res, m)
}
return res, nil
}
func (d *Datastore) GetMessages(ctx context.Context, ids []common.MessageID, wantData bool) ([]*fspb.Message, error) {
var res []*fspb.Message
err := d.runInTx(func(tx *sql.Tx) error {
var err error
res, err = d.getMessages(ctx, tx, ids, wantData)
return err
})
return res, err
}
func (d *Datastore) GetMessageResult(ctx context.Context, id common.MessageID) (*fspb.MessageResult, error) {
d.l.Lock()
defer d.l.Unlock()
var ret *fspb.MessageResult
err := d.runInTx(func(tx *sql.Tx) error {
row := tx.QueryRowContext(ctx, "SELECT "+
"creation_time_seconds, "+
"creation_time_nanos, "+
"processed_time_seconds, "+
"processed_time_nanos, "+
"failed, "+
"failed_reason "+
"FROM messages WHERE message_id=?", id.String())
var dbm dbMessage
if err := row.Scan(
&dbm.creationTimeSeconds,
&dbm.creationTimeNanos,
&dbm.processedTimeSeconds,
&dbm.processedTimeNanos,
&dbm.failed,
&dbm.failedReason,
); err == sql.ErrNoRows {
return nil
} else if err != nil {
return err
}
ret = toMessageResultProto(&dbm)
return nil
})
return ret, err
}
// ClientMessagesForProcessing implements db.MessageStore.
func (d *Datastore) ClientMessagesForProcessing(ctx context.Context, id common.ClientID, lim uint64, serviceLimits map[string]uint64) ([]*fspb.Message, error) {
if id == (common.ClientID{}) {
return nil, errors.New("a client is required")
}
return d.internalMessagesForProcessing(ctx, id, lim, serviceLimits)
}
func (d *Datastore) internalMessagesForProcessing(ctx context.Context, id common.ClientID, lim uint64, serviceLimits map[string]uint64) ([]*fspb.Message, error) {
d.l.Lock()
defer d.l.Unlock()
read := make(map[string]uint64)
var res []*fspb.Message
if err := d.runInTx(func(tx *sql.Tx) error {
// As an internal addition to the MessageStore interface, this
// also gets server messages when id=ClientID{}.
rs, err := tx.QueryContext(ctx, "SELECT "+
"m.message_id, "+
"m.source_client_id, "+
"m.source_service_name, "+
"m.source_message_id, "+
"m.destination_client_id, "+
"m.destination_service_name, "+
"m.message_type, "+
"m.creation_time_seconds, "+
"m.creation_time_nanos,"+
"m.validation_info,"+
"m.annotations,"+
"pm.retry_count, "+
"pm.data_type_url, "+
"pm.data_value "+
"FROM messages AS m, pending_messages AS pm "+
"WHERE m.destination_client_id = ? AND m.message_id=pm.message_id AND pm.scheduled_time < ? ",
toClientIDString(id.Bytes()), toMicro(db.Now()))
if err != nil {
return err
}
defer rs.Close()
for rs.Next() {
var dbm dbMessage
if err = rs.Scan(
&dbm.messageID,
&dbm.sourceClientID,
&dbm.sourceServiceName,
&dbm.sourceMessageID,
&dbm.destinationClientID,
&dbm.destinationServiceName,
&dbm.messageType,
&dbm.creationTimeSeconds,
&dbm.creationTimeNanos,
&dbm.validationInfo,
&dbm.annotations,
&dbm.retryCount,
&dbm.dataTypeURL,
&dbm.dataValue,
); err != nil {
return err
}
if serviceLimits != nil {
if read[dbm.destinationServiceName] >= serviceLimits[dbm.destinationServiceName] {
continue
} else {
read[dbm.destinationServiceName]++
}
}
nc := dbm.retryCount + 1
var due int64
if dbm.destinationClientID == "" {
due = toMicro(db.ServerRetryTime(nc))
} else {
due = toMicro(db.ClientRetryTime())
}
if _, err = tx.ExecContext(ctx, "UPDATE pending_messages SET retry_count=?, scheduled_time=? WHERE message_id=?", nc, due, dbm.messageID); err != nil {
return err
}
m, err := toMessageProto(&dbm)
if err != nil {
return err
}
res = append(res, m)
if len(res) >= int(lim) {
return nil
}
}
return rs.Err()
}); err != nil {
return nil, err
}
return res, nil
}
type messageLooper struct {
d *Datastore
mp db.MessageProcessor
processingTicker *time.Ticker
stopCalled chan struct{}
loopDone chan struct{}
}
func (d *Datastore) RegisterMessageProcessor(mp db.MessageProcessor) {
if d.looper != nil {
log.Warning("Attempt to register a second MessageProcessor.")
d.looper.stop()
}
d.looper = &messageLooper{
d: d,
mp: mp,
processingTicker: time.NewTicker(300 * time.Millisecond),
stopCalled: make(chan struct{}),
loopDone: make(chan struct{}),
}
go d.looper.messageProcessingLoop()
}
func (d *Datastore) StopMessageProcessor() {
if d.looper != nil {
d.looper.stop()
}
d.looper = nil
}
// messageProcessingLoop reads messages that should be processed on the server
// from the datastore and delivers them to the registered MessageProcessor.
func (l *messageLooper) messageProcessingLoop() {
defer close(l.loopDone)
for {
select {
case <-l.stopCalled:
return
case <-l.processingTicker.C:
l.processMessages()
}
}
}
func (l *messageLooper) stop() {
l.processingTicker.Stop()
close(l.stopCalled)
<-l.loopDone
}
func (l *messageLooper) processMessages() {
for {
msgs, err := l.d.internalMessagesForProcessing(context.Background(), common.ClientID{}, 5, nil)
if err != nil {
if err.Error() == "attempt to write a readonly database" {
log.Errorf("Failed to read server messages for processing; probably the database was removed: %v", err)
return
}
log.Errorf("Failed to read server messages for processing: %v", err)
continue
}
l.mp.ProcessMessages(msgs)
if len(msgs) == 0 {
return
}
}
}