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shard.go
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shard.go
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// Copyright (c) 2019 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 postgres
import (
"context"
"database/sql"
"github.com/uber/cadence/common/persistence/sql/sqlplugin"
)
const (
createShardQry = `INSERT INTO
shards (shard_id, range_id, data, data_encoding) VALUES ($1, $2, $3, $4)`
getShardQry = `SELECT
shard_id, range_id, data, data_encoding
FROM shards WHERE shard_id = $1`
updateShardQry = `UPDATE shards
SET range_id = $1, data = $2, data_encoding = $3
WHERE shard_id = $4`
lockShardQry = `SELECT range_id FROM shards WHERE shard_id = $1 FOR UPDATE`
readLockShardQry = `SELECT range_id FROM shards WHERE shard_id = $1 FOR SHARE`
)
// InsertIntoShards inserts one or more rows into shards table
func (pdb *db) InsertIntoShards(ctx context.Context, row *sqlplugin.ShardsRow) (sql.Result, error) {
dbShardID := sqlplugin.GetDBShardIDFromHistoryShardID(int(row.ShardID), pdb.GetTotalNumDBShards())
return pdb.driver.ExecContext(ctx, dbShardID, createShardQry, row.ShardID, row.RangeID, row.Data, row.DataEncoding)
}
// UpdateShards updates one or more rows into shards table
func (pdb *db) UpdateShards(ctx context.Context, row *sqlplugin.ShardsRow) (sql.Result, error) {
dbShardID := sqlplugin.GetDBShardIDFromHistoryShardID(int(row.ShardID), pdb.GetTotalNumDBShards())
return pdb.driver.ExecContext(ctx, dbShardID, updateShardQry, row.RangeID, row.Data, row.DataEncoding, row.ShardID)
}
// SelectFromShards reads one or more rows from shards table
func (pdb *db) SelectFromShards(ctx context.Context, filter *sqlplugin.ShardsFilter) (*sqlplugin.ShardsRow, error) {
dbShardID := sqlplugin.GetDBShardIDFromHistoryShardID(int(filter.ShardID), pdb.GetTotalNumDBShards())
var row sqlplugin.ShardsRow
err := pdb.driver.GetContext(ctx, dbShardID, &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 (pdb *db) ReadLockShards(ctx context.Context, filter *sqlplugin.ShardsFilter) (int, error) {
dbShardID := sqlplugin.GetDBShardIDFromHistoryShardID(int(filter.ShardID), pdb.GetTotalNumDBShards())
var rangeID int
err := pdb.driver.GetContext(ctx, dbShardID, &rangeID, readLockShardQry, filter.ShardID)
return rangeID, err
}
// WriteLockShards acquires a write lock on a single row in shards table
func (pdb *db) WriteLockShards(ctx context.Context, filter *sqlplugin.ShardsFilter) (int, error) {
dbShardID := sqlplugin.GetDBShardIDFromHistoryShardID(int(filter.ShardID), pdb.GetTotalNumDBShards())
var rangeID int
err := pdb.driver.GetContext(ctx, dbShardID, &rangeID, lockShardQry, filter.ShardID)
return rangeID, err
}