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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 mysql
import (
"context"
"database/sql"
"go.temporal.io/server/common/persistence/sql/sqlplugin"
)
const (
createShardQry = `INSERT INTO
shards (shard_id, range_id, data, data_encoding) VALUES (?, ?, ?, ?)`
getShardQry = `SELECT
shard_id, range_id, data, data_encoding
FROM shards WHERE shard_id = ?`
updateShardQry = `UPDATE shards
SET range_id = ?, data = ?, data_encoding = ?
WHERE shard_id = ?`
lockShardQry = `SELECT range_id FROM shards WHERE shard_id = ? FOR UPDATE`
readLockShardQry = `SELECT range_id FROM shards WHERE shard_id = ? LOCK IN SHARE MODE`
)
// InsertIntoShards inserts one or more rows into shards table
func (mdb *db) InsertIntoShards(
ctx context.Context,
row *sqlplugin.ShardsRow,
) (sql.Result, error) {
return mdb.conn.ExecContext(ctx,
createShardQry,
row.ShardID,
row.RangeID,
row.Data,
row.DataEncoding,
)
}
// UpdateShards updates one or more rows into shards table
func (mdb *db) UpdateShards(
ctx context.Context,
row *sqlplugin.ShardsRow,
) (sql.Result, error) {
return mdb.conn.ExecContext(ctx,
updateShardQry,
row.RangeID,
row.Data,
row.DataEncoding,
row.ShardID,
)
}
// SelectFromShards reads one or more rows from shards table
func (mdb *db) SelectFromShards(
ctx context.Context,
filter sqlplugin.ShardsFilter,
) (*sqlplugin.ShardsRow, error) {
var row sqlplugin.ShardsRow
err := mdb.conn.GetContext(ctx,
&row,
getShardQry,
filter.ShardID,
)
if err != nil {
return nil, err
}
return &row, err
}
// ReadLockShards acquires a read lock on a single row in shards table
func (mdb *db) ReadLockShards(
ctx context.Context,
filter sqlplugin.ShardsFilter,
) (int64, error) {
var rangeID int64
err := mdb.conn.GetContext(ctx,
&rangeID,
readLockShardQry,
filter.ShardID,
)
return rangeID, err
}
// WriteLockShards acquires a write lock on a single row in shards table
func (mdb *db) WriteLockShards(
ctx context.Context,
filter sqlplugin.ShardsFilter,
) (int64, error) {
var rangeID int64
err := mdb.conn.GetContext(ctx,
&rangeID,
lockShardQry,
filter.ShardID,
)
return rangeID, err
}