/
db.go
231 lines (192 loc) · 4.88 KB
/
db.go
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// Copyright 2017-2019, Square, Inc.
package db
import (
"database/sql"
"fmt"
"os/exec"
"strings"
"sync"
"github.com/go-sql-driver/mysql"
rmtest "github.com/square/spincycle/request-manager/test"
"github.com/square/spincycle/test"
)
type manager struct {
dsn *mysql.Config
defaultCmdArgs []string
cliPath string
//
dbs map[string]*sql.DB // db name => *sql.Db
*sync.Mutex
}
// A Manager manages the lifecycle of test databases. It is safe to use
// with multiple databases concurrently.
type Manager interface {
// Create creates a new db and populates it the the given data file.
// It returns the name of the db it creates.
Create(dataFile string) (string, error)
// CreateBlank creates a new db without loading the default schema
// or populating it with any data. It returns the name of the db created.
CreateBlank() (string, error)
// LoadSQLFile loads a SQL file to the given schema.
LoadSQLFile(dbName, file string) error
// Connect takes a db name and returns a *sql.DB for it.
Connect(dbName string) (*sql.DB, error)
// Destroy closes a db's connection and then drops the db.
Destroy(dbName string) error
}
func NewManager() (Manager, error) {
dsn, err := mysql.ParseDSN(rmtest.MySQLDSN)
if err != nil {
return nil, err
}
// Create default args for running the mysql cli with exec.Command.
dca := defaultCmdArgs(dsn)
cliPath := "mysql" // @todo: env var SPINCYCLE_TEST_MYSQL_CLI
return &manager{
dsn: dsn,
defaultCmdArgs: dca,
cliPath: cliPath,
dbs: make(map[string]*sql.DB),
Mutex: &sync.Mutex{},
}, nil
}
func (m *manager) Create(dataFile string) (string, error) {
dbName := m.dsn.DBName + "_" + test.RandSeq(6)
// Create a fresh db.
if err := m.dropDB(dbName); err != nil {
return dbName, err
}
if err := m.createDB(dbName); err != nil {
return dbName, err
}
// Source the schema.
if err := m.LoadSQLFile(dbName, rmtest.SchemaFile); err != nil {
return dbName, err
}
// Source test data.
if dataFile != "" {
if err := m.LoadSQLFile(dbName, dataFile); err != nil {
return dbName, err
}
}
// Add the db to the dbs map.
m.Lock()
m.dbs[dbName] = nil
m.Unlock()
return dbName, nil
}
func (m *manager) CreateBlank() (string, error) {
dbName := m.dsn.DBName + "_" + test.RandSeq(6)
// Create a fresh db.
if err := m.dropDB(dbName); err != nil {
return dbName, err
}
if err := m.createDB(dbName); err != nil {
return dbName, err
}
// Add the db to the dbs map.
m.Lock()
m.dbs[dbName] = nil
m.Unlock()
return dbName, nil
}
func (m *manager) Connect(dbName string) (*sql.DB, error) {
m.Lock()
defer m.Unlock()
db, ok := m.dbs[dbName]
if !ok {
return nil, fmt.Errorf("db has not been setup")
}
if db == nil {
// Override the db in the default dsn, and connect to the db.
curDsn := *m.dsn
curDsn.DBName = dbName
db, err := sql.Open("mysql", curDsn.FormatDSN())
if err != nil {
return db, err
}
if err = db.Ping(); err != nil {
return db, err
}
m.dbs[dbName] = db
}
return m.dbs[dbName], nil
}
func (m *manager) Destroy(dbName string) error {
m.Lock()
defer m.Unlock()
if db, ok := m.dbs[dbName]; ok {
if db != nil {
db.Close()
}
// Drop the db.
if err := m.dropDB(dbName); err != nil {
return err
}
}
delete(m.dbs, dbName)
return nil
}
func (m *manager) LoadSQLFile(dbName, file string) error {
q := "SOURCE " + file
extraArgs := []string{dbName} // pass this to the cli so that we source the file into the correct db
err := m.execCLIQuery(q, extraArgs)
if err != nil {
return err
}
return nil
}
// -------------------------------------------------------------------------- //
func (m *manager) dropDB(dbName string) error {
q := "DROP DATABASE IF EXISTS " + dbName
err := m.execCLIQuery(q, nil)
if err != nil {
return err
}
return nil
}
func (m *manager) createDB(dbName string) error {
q := "CREATE DATABASE " + dbName
err := m.execCLIQuery(q, nil)
if err != nil {
return err
}
return nil
}
func (m *manager) execCLIQuery(query string, extraArgs []string) error {
cmdArgs := append(m.defaultCmdArgs, "-e", query)
if extraArgs != nil {
cmdArgs = append(cmdArgs, extraArgs...)
}
cmd := exec.Command(m.cliPath, cmdArgs...)
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("%s: %s", err, output)
}
return nil
}
// Given a dsn, enerate default args for running the mysql cli with exec.Command.
func defaultCmdArgs(dsnConfig *mysql.Config) []string {
addrSplit := strings.Split(dsnConfig.Addr, ":")
var host, port string
if len(addrSplit) > 0 {
host = addrSplit[0]
}
if len(addrSplit) > 1 {
port = addrSplit[1]
}
dca := []string{}
if host != "" {
dca = append(dca, "-h", host)
}
if port != "" {
dca = append(dca, "-P", port)
}
if dsnConfig.User != "" {
dca = append(dca, "-u", dsnConfig.User)
}
if dsnConfig.Passwd != "" {
dca = append(dca, "-p", dsnConfig.Passwd)
}
return dca
}