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uber / cadence / 01902805-1940-414a-a712-360172dfc37f

17 Jun 2024 09:05PM UTC coverage: 71.431% (-0.02%) from 71.451%
01902805-1940-414a-a712-360172dfc37f

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79.49
/common/persistence/sql/sqlplugin/mysql/db.go
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// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package mysql
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import (
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        "context"
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        "database/sql"
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        "time"
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        "github.com/VividCortex/mysqlerr"
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        "github.com/go-sql-driver/mysql"
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        "github.com/jmoiron/sqlx"
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        "github.com/uber/cadence/common/persistence/sql/sqldriver"
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        "github.com/uber/cadence/common/persistence/sql/sqlplugin"
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)
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type (
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        db struct {
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                converter   DataConverter
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                driver      sqldriver.Driver
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                originalDBs []*sqlx.DB
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                numDBShards int
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        }
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)
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func (mdb *db) GetTotalNumDBShards() int {
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        return mdb.numDBShards
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}
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var _ sqlplugin.AdminDB = (*db)(nil)
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var _ sqlplugin.DB = (*db)(nil)
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var _ sqlplugin.Tx = (*db)(nil)
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func (mdb *db) IsDupEntryError(err error) bool {
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        sqlErr, ok := err.(*mysql.MySQLError)
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        // ErrDupEntry MySQL Error 1062 indicates a duplicate primary key i.e. the row already exists,
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        // so we don't do the insert and return a ConditionalUpdate error.
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        return ok && sqlErr.Number == mysqlerr.ER_DUP_ENTRY
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}
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func (mdb *db) IsNotFoundError(err error) bool {
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        return err == sql.ErrNoRows
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}
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func (mdb *db) IsTimeoutError(err error) bool {
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        if err == context.DeadlineExceeded {
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                return true
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        }
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        sqlErr, ok := err.(*mysql.MySQLError)
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        if ok {
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                if sqlErr.Number == mysqlerr.ER_NET_READ_INTERRUPTED ||
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                        sqlErr.Number == mysqlerr.ER_NET_WRITE_INTERRUPTED ||
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                        sqlErr.Number == mysqlerr.ER_LOCK_WAIT_TIMEOUT ||
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                        sqlErr.Number == mysqlerr.ER_XA_RBTIMEOUT ||
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                        sqlErr.Number == mysqlerr.ER_QUERY_TIMEOUT ||
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                        sqlErr.Number == mysqlerr.ER_LOCKING_SERVICE_TIMEOUT ||
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                        sqlErr.Number == mysqlerr.ER_REGEXP_TIME_OUT {
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                        return true
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                }
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        }
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        return false
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}
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func (mdb *db) IsThrottlingError(err error) bool {
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        sqlErr, ok := err.(*mysql.MySQLError)
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        if ok {
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                if sqlErr.Number == mysqlerr.ER_CON_COUNT_ERROR ||
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                        sqlErr.Number == mysqlerr.ER_TOO_MANY_USER_CONNECTIONS ||
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                        sqlErr.Number == mysqlerr.ER_TOO_MANY_CONCURRENT_TRXS ||
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                        sqlErr.Number == mysqlerr.ER_CLONE_TOO_MANY_CONCURRENT_CLONES {
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                        return true
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                }
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        }
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        return false
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}
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// newDB returns an instance of DB, which is a logical
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// connection to the underlying mysql database
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// dbShardID is needed when tx is not nil
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func newDB(xdbs []*sqlx.DB, tx *sqlx.Tx, dbShardID int, numDBShards int) (*db, error) {
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        driver, err := sqldriver.NewDriver(xdbs, tx, dbShardID)
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        if err != nil {
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                return nil, err
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        }
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        db := &db{
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                converter:   &converter{},
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                originalDBs: xdbs, // this is kept because newDB will be called again when starting a transaction
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                driver:      driver,
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                numDBShards: numDBShards,
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        }
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        return db, nil
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}
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// BeginTx starts a new transaction and returns a reference to the Tx object
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func (mdb *db) BeginTx(ctx context.Context, dbShardID int) (sqlplugin.Tx, error) {
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        xtx, err := mdb.driver.BeginTxx(ctx, dbShardID, nil)
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        if err != nil {
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                return nil, err
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        }
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        return newDB(mdb.originalDBs, xtx, dbShardID, mdb.numDBShards)
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}
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// Commit commits a previously started transaction
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func (mdb *db) Commit() error {
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        return mdb.driver.Commit()
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}
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// Rollback triggers rollback of a previously started transaction
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func (mdb *db) Rollback() error {
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        return mdb.driver.Rollback()
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}
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// Close closes the connection to the mysql db
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func (mdb *db) Close() error {
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        return mdb.driver.Close()
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}
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// PluginName returns the name of the mysql plugin
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func (mdb *db) PluginName() string {
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        return PluginName
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}
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// SupportsTTL returns weather MySQL supports TTL
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func (mdb *db) SupportsTTL() bool {
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        return false
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}
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// MaxAllowedTTL returns the max allowed ttl MySQL supports
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func (mdb *db) MaxAllowedTTL() (*time.Duration, error) {
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        return nil, sqlplugin.ErrTTLNotSupported
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}
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// SupportsTTL returns weather MySQL supports Asynchronous transaction
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func (mdb *db) SupportsAsyncTransaction() bool {
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        return false
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}
×
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