/
db.go
284 lines (255 loc) · 6.19 KB
/
db.go
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package test
import (
"database/sql"
"fmt"
"github.com/afk11/airtrack/pkg/config"
"github.com/afk11/airtrack/pkg/db/migrations"
"github.com/doug-martin/goqu/v9"
// imported here to ensure it's available for tests
_ "github.com/doug-martin/goqu/v9/dialect/mysql"
_ "github.com/doug-martin/goqu/v9/dialect/postgres"
_ "github.com/doug-martin/goqu/v9/dialect/sqlite3"
"github.com/jmoiron/sqlx"
"github.com/pkg/errors"
"os"
"strconv"
"sync"
"time"
)
// LoadTestTimeZone returns the configured
// timezone or uses UTC if none is set.
func LoadTestTimeZone() (*time.Location, error) {
var v string
var found bool
if v, found = os.LookupEnv("AIRTRACK_TEST_TIMEZONE"); !found {
v = "UTC"
}
l, err := time.LoadLocation(v)
if err != nil {
return nil, err
}
return l, nil
}
// MustLoadTestTimeZone loads a timezone using LoadTestTimeZone
// but will panic if an error is returned
func MustLoadTestTimeZone() *time.Location {
tz, err := LoadTestTimeZone()
if err != nil {
panic(err)
}
return tz
}
// DbConfig defines information about the test database
type DbConfig struct {
Driver string
DatabaseFmt string
Username string
Password string
Host string
Port int
NumDbs int
}
// LoadTestDbConfig can be called to create a database configuration
// based on environment variables.
func LoadTestDbConfig() (*config.Database, error) {
cfg := &config.Database{
Driver: "mysql",
Username: "root",
Password: "",
Host: "127.0.0.1",
Port: 3306,
}
if v, found := os.LookupEnv("AIRTRACK_TEST_DB_DRIVER"); found {
cfg.Driver = v
}
if v, found := os.LookupEnv("AIRTRACK_TEST_DB_USER"); found {
cfg.Username = v
}
if v, found := os.LookupEnv("AIRTRACK_TEST_DB_PASS"); found {
cfg.Password = v
}
if v, found := os.LookupEnv("AIRTRACK_TEST_DB_HOST"); found {
cfg.Host = v
}
if v, found := os.LookupEnv("AIRTRACK_TEST_DB_PORT"); found {
p, err := strconv.Atoi(v)
if err != nil {
return nil, err
}
cfg.Port = p
}
return cfg, nil
}
// DB contains structures for a test database
type DB struct {
conf *DbConfig
tz *time.Location
db string
inUse bool
}
var dbs []*DB
var claimNextDBLock = &sync.Mutex{}
func init() {
tz := MustLoadTestTimeZone()
dbs = make([]*DB, 4)
for i := 0; i < 4; i++ {
dbs[i] = &DB{
db: fmt.Sprintf("airtrack_test_%d", i),
tz: tz,
inUse: false}
}
}
// ClaimNextDB returns the first free database. You should
// limit concurrency to the number of DB's you want to use,
// otherwise this function will panic.
func ClaimNextDB() *DB {
claimNextDBLock.Lock()
defer claimNextDBLock.Unlock()
for _, testDB := range dbs {
if !testDB.inUse {
testDB.inUse = true
return testDB
}
}
panic("Failed to claim a DB")
}
// DropTablesPostgres deletes all tables in the database db
// is connected to
func DropTablesPostgres(db *sqlx.DB) error {
rows, err := db.Query(`SELECT table_name
FROM information_schema.tables
WHERE table_schema='public'
AND table_type='BASE TABLE';`)
if err != nil {
return errors.Wrapf(err, "querying for tables")
}
defer rows.Close()
var tables []string
for rows.Next() {
var table string
err = rows.Scan(&table)
if err != nil {
return err
}
tables = append(tables, table)
}
for _, table := range tables {
_, err = db.Exec("DROP TABLE " + table)
if err != nil {
return errors.Wrapf(err, "drop table")
}
}
return nil
}
// DropTablesMysql deletes all tables in the database db
// is connected to
func DropTablesMysql(db *sqlx.DB) error {
rows, err := db.Query(`SHOW TABLES`)
if err != nil {
return errors.Wrapf(err, "querying for tables")
}
defer rows.Close()
var tables []string
for rows.Next() {
var table string
err = rows.Scan(&table)
if err != nil {
return err
}
tables = append(tables, table)
}
for _, table := range tables {
_, err = db.Exec("DROP TABLE " + table)
if err != nil {
return errors.Wrapf(err, "drop table")
}
}
return nil
}
func sqliteTempFile(testDB *DB) string {
return "/tmp/" + testDB.db + ".sqlite3"
}
func initDb(testDB *DB, migrate bool) (*sqlx.DB, *config.Database, goqu.DialectWrapper, string, func()) {
_, ok := os.LookupEnv("AIRTRACK_TEST_DB_DRIVER")
var dbConf *config.Database
var err error
if ok {
dbConf, err = LoadTestDbConfig()
if err != nil {
panic(err)
}
dbConf.Database = testDB.db
} else {
dbConf = &config.Database{
Driver: "sqlite3",
Database: sqliteTempFile(testDB),
}
}
dbURL, err := dbConf.DataSource(testDB.tz)
if err != nil {
panic(err)
}
if dbConf.Driver == config.DatabaseDriverSqlite3 {
if _, err := os.Stat(dbConf.Database); err == nil {
err = os.Remove(dbConf.Database)
if err != nil {
panic(err)
}
}
} else if dbConf.Driver == config.DatabaseDriverPostgresql {
// only need this for circleci really
dbURL = dbURL + " sslmode=disable"
}
sqlConn, err := sql.Open(dbConf.Driver, dbURL)
if err != nil {
panic(err)
}
dbConn := sqlx.NewDb(sqlConn, dbConf.Driver)
err = dbConn.Ping()
if err != nil {
panic(err)
}
if migrate {
switch dbConf.Driver {
case config.DatabaseDriverMySQL:
err = DropTablesMysql(dbConn)
if err != nil {
panic(err)
}
case config.DatabaseDriverPostgresql:
err = DropTablesPostgres(dbConn)
if err != nil {
panic(err)
}
}
m, err := migrations.InitMigrations(dbConf, testDB.tz)
if err != nil {
panic(err)
}
err = m.Up()
if err != nil {
panic(err)
}
}
// create close function
closeFn := func() {
dbConn.Close()
testDB.inUse = false
}
dialect := goqu.Dialect(dbConf.Driver)
return dbConn, dbConf, dialect, testDB.db, closeFn
}
// InitDB claims a DB and creates a connection. The resulting database
// will NOT be initialized with migrations.
func InitDB() (*sqlx.DB, *config.Database, goqu.DialectWrapper, string, func()) {
testDB := ClaimNextDB()
dbConn, dbConf, dialect, dbName, closeFn := initDb(testDB, false)
return dbConn, dbConf, dialect, dbName, closeFn
}
// InitDBUp claims a DB and creates a connection. The resulting database
// will be initialized with migrations.
func InitDBUp() (*sqlx.DB, goqu.DialectWrapper, string, func()) {
testDB := ClaimNextDB()
dbConn, _, dialect, dbName, closeFn := initDb(testDB, true)
return dbConn, dialect, dbName, closeFn
}