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shard.go
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shard.go
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// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
//
// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package sql
import (
"context"
"database/sql"
"fmt"
"go.temporal.io/api/serviceerror"
"go.temporal.io/server/common/log"
"go.temporal.io/server/common/persistence"
"go.temporal.io/server/common/persistence/sql/sqlplugin"
)
type sqlShardStore struct {
SqlStore
currentClusterName string
}
// newShardPersistence creates an instance of ShardManager
func newShardPersistence(
db sqlplugin.DB,
currentClusterName string,
logger log.Logger,
) (persistence.ShardStore, error) {
return &sqlShardStore{
SqlStore: NewSqlStore(db, logger),
currentClusterName: currentClusterName,
}, nil
}
func (m *sqlShardStore) GetClusterName() string {
return m.currentClusterName
}
func (m *sqlShardStore) GetOrCreateShard(
ctx context.Context,
request *persistence.InternalGetOrCreateShardRequest,
) (*persistence.InternalGetOrCreateShardResponse, error) {
row, err := m.Db.SelectFromShards(ctx, sqlplugin.ShardsFilter{
ShardID: request.ShardID,
})
switch err {
case nil:
return &persistence.InternalGetOrCreateShardResponse{
ShardInfo: persistence.NewDataBlob(row.Data, row.DataEncoding),
}, nil
case sql.ErrNoRows:
default:
return nil, serviceerror.NewUnavailable(fmt.Sprintf("GetOrCreateShard: failed to get ShardID %v. Error: %v", request.ShardID, err))
}
if request.CreateShardInfo == nil {
return nil, serviceerror.NewNotFound(fmt.Sprintf("GetOrCreateShard: ShardID %v not found. Error: %v", request.ShardID, err))
}
rangeID, shardInfo, err := request.CreateShardInfo()
if err != nil {
return nil, serviceerror.NewUnavailable(fmt.Sprintf("GetOrCreateShard: failed to encode shard info for ShardID %v. Error: %v", request.ShardID, err))
}
row = &sqlplugin.ShardsRow{
ShardID: request.ShardID,
RangeID: rangeID,
Data: shardInfo.Data,
DataEncoding: shardInfo.EncodingType.String(),
}
_, err = m.Db.InsertIntoShards(ctx, row)
if err == nil {
return &persistence.InternalGetOrCreateShardResponse{
ShardInfo: shardInfo,
}, nil
} else if m.Db.IsDupEntryError(err) {
// conflict, try again
request.CreateShardInfo = nil // prevent loop
return m.GetOrCreateShard(ctx, request)
} else {
return nil, serviceerror.NewUnavailable(fmt.Sprintf("GetOrCreateShard: failed to insert into shards table. Error: %v", err))
}
}
func (m *sqlShardStore) UpdateShard(
ctx context.Context,
request *persistence.InternalUpdateShardRequest,
) error {
return m.txExecute(ctx, "UpdateShard", func(tx sqlplugin.Tx) error {
if err := lockShard(ctx,
tx,
request.ShardID,
request.PreviousRangeID,
); err != nil {
return err
}
result, err := tx.UpdateShards(ctx, &sqlplugin.ShardsRow{
ShardID: request.ShardID,
RangeID: request.RangeID,
Data: request.ShardInfo.Data,
DataEncoding: request.ShardInfo.EncodingType.String(),
})
if err != nil {
return err
}
rowsAffected, err := result.RowsAffected()
if err != nil {
return fmt.Errorf("rowsAffected returned error for shardID %v: %v", request.ShardID, err)
}
if rowsAffected != 1 {
return fmt.Errorf("rowsAffected returned %v shards instead of one", rowsAffected)
}
return nil
})
}
func (m *sqlShardStore) AssertShardOwnership(
ctx context.Context,
request *persistence.AssertShardOwnershipRequest,
) error {
return nil
}
// initiated by the owning shard
func lockShard(
ctx context.Context,
tx sqlplugin.Tx,
shardID int32,
oldRangeID int64,
) error {
rangeID, err := tx.WriteLockShards(ctx, sqlplugin.ShardsFilter{
ShardID: shardID,
})
switch err {
case nil:
if rangeID != oldRangeID {
return &persistence.ShardOwnershipLostError{
ShardID: shardID,
Msg: fmt.Sprintf("Failed to update shard. Previous range ID: %v; new range ID: %v", oldRangeID, rangeID),
}
}
return nil
case sql.ErrNoRows:
return serviceerror.NewUnavailable(fmt.Sprintf("Failed to lock shard with ID %v that does not exist.", shardID))
default:
return serviceerror.NewUnavailable(fmt.Sprintf("Failed to lock shard with ID: %v. Error: %v", shardID, err))
}
}
// initiated by the owning shard
func readLockShard(
ctx context.Context,
tx sqlplugin.Tx,
shardID int32,
oldRangeID int64,
) error {
rangeID, err := tx.ReadLockShards(ctx, sqlplugin.ShardsFilter{
ShardID: shardID,
})
switch err {
case nil:
if rangeID != oldRangeID {
return &persistence.ShardOwnershipLostError{
ShardID: shardID,
Msg: fmt.Sprintf("Failed to lock shard. Previous range ID: %v; new range ID: %v", oldRangeID, rangeID),
}
}
return nil
case sql.ErrNoRows:
return serviceerror.NewUnavailable(fmt.Sprintf("Failed to lock shard with ID %v that does not exist.", shardID))
default:
return serviceerror.NewUnavailable(fmt.Sprintf("Failed to lock shard with ID: %v. Error: %v", shardID, err))
}
}