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store.go
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store.go
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// Copyright (c) 2017 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 storage
import (
"bytes"
"fmt"
"net/url"
"strings"
"github.com/iancoleman/strcase"
"github.com/jmoiron/sqlx"
"github.com/uber/cadence/common/persistence/sql/storage/mysql"
"github.com/uber/cadence/common/persistence/sql/storage/sqldb"
"github.com/uber/cadence/common/service/config"
)
const (
dsnFmt = "%s:%s@%v(%v)/%s"
isolationLevelAttrName = "transaction_isolation"
isolationLevelAttrNameLegacy = "tx_isolation"
defaultIsolationLevel = "'READ-COMMITTED'"
)
var dsnAttrOverrides = map[string]string{
"parseTime": "true",
"clientFoundRows": "true",
"multiStatements": "true",
}
// NewSQLDB creates a returns a reference to a logical connection to the
// underlying SQL database. The returned object is to tied to a single
// SQL database and the object can be used to perform CRUD operations on
// the tables in the database
func NewSQLDB(cfg *config.SQL) (sqldb.Interface, error) {
db, err := sqlx.Connect(cfg.DriverName, buildDSN(cfg))
if err != nil {
return nil, err
}
if cfg.MaxConns > 0 {
db.SetMaxOpenConns(cfg.MaxConns)
}
if cfg.MaxIdleConns > 0 {
db.SetMaxIdleConns(cfg.MaxIdleConns)
}
if cfg.MaxConnLifetime > 0 {
db.SetConnMaxLifetime(cfg.MaxConnLifetime)
}
// Maps struct names in CamelCase to snake without need for db struct tags.
db.MapperFunc(strcase.ToSnake)
return mysql.NewDB(db, nil), nil
}
func buildDSN(cfg *config.SQL) string {
attrs := buildDSNAttrs(cfg)
dsn := fmt.Sprintf(dsnFmt, cfg.User, cfg.Password, cfg.ConnectProtocol, cfg.ConnectAddr, cfg.DatabaseName)
if attrs != "" {
dsn = dsn + "?" + attrs
}
return dsn
}
func buildDSNAttrs(cfg *config.SQL) string {
attrs := make(map[string]string, len(dsnAttrOverrides)+len(cfg.ConnectAttributes)+1)
for k, v := range cfg.ConnectAttributes {
k1, v1 := sanitizeAttr(k, v)
attrs[k1] = v1
}
// only override isolation level if not specified
if !hasAttr(attrs, isolationLevelAttrName) &&
!hasAttr(attrs, isolationLevelAttrNameLegacy) {
attrs[isolationLevelAttrName] = defaultIsolationLevel
}
// these attrs are always overriden
for k, v := range dsnAttrOverrides {
attrs[k] = v
}
first := true
var buf bytes.Buffer
for k, v := range attrs {
if !first {
buf.WriteString("&")
}
first = false
buf.WriteString(k)
buf.WriteString("=")
buf.WriteString(v)
}
return url.PathEscape(buf.String())
}
func hasAttr(attrs map[string]string, key string) bool {
_, ok := attrs[key]
return ok
}
func sanitizeAttr(inkey string, invalue string) (string, string) {
key := strings.ToLower(strings.TrimSpace(inkey))
value := strings.ToLower(strings.TrimSpace(invalue))
switch key {
case isolationLevelAttrName, isolationLevelAttrNameLegacy:
if value[0] != '\'' { // mysql sys variable values must be enclosed in single quotes
value = "'" + value + "'"
}
return key, value
default:
return inkey, invalue
}
}