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connections.go
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connections.go
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package sql
import (
"errors"
"fmt"
"strconv"
"strings"
"sync"
"github.com/gocql/gocql"
"github.com/golang-migrate/migrate/v4"
"github.com/golang-migrate/migrate/v4/database"
"github.com/golang-migrate/migrate/v4/database/cassandra"
"github.com/golang-migrate/migrate/v4/database/mysql"
"github.com/golang-migrate/migrate/v4/database/postgres"
"github.com/golang-migrate/migrate/v4/database/sqlite"
"github.com/golang-migrate/migrate/v4/source/iofs"
"github.com/jmoiron/sqlx"
"github.com/jmoiron/sqlx/reflectx"
cqlreflectx "github.com/scylladb/go-reflectx"
"github.com/scylladb/gocqlx/v2"
)
// TODO: Use master v4 version
// Current one is out of date and not supported
var dbs = &dbConnections{
m: map[string]*DB{},
}
type dbConnections struct {
sync.Mutex
m map[string]*DB
}
func deleteDB(db string) {
dbs.Lock()
defer dbs.Unlock()
delete(dbs.m, db)
}
func (dbc *dbConnections) GetSQLConnection(o *DB) error {
dbc.Lock()
defer dbc.Unlock()
dbSource, err := o.getDataSource()
if err != nil {
return err
}
o.Debugf("source %s: %s", o.DBSource, dbSource)
// Check if the connection exists
if val, ok := dbc.m[dbSource]; ok {
*o = *val
return val.err
}
var db *sqlx.DB
// Try to open a connection if it doesn't exist
db, o.err = sqlx.Open(o.DBSource.String(), dbSource)
if o.err == nil {
// Convert sql to sqlx
o.sql = db
o.sql.Mapper = reflectx.NewMapperTagFunc(
"json",
preMapFunc(o.mapFunc),
preMapFunc(o.tagMapFunc),
)
}
// Add it to the pool so that some other service can reference it
dbc.m[dbSource] = o
// Run migrations
if o.MigratePath != "" && o.Migrate {
if err := RunMigrations(o); err != nil {
return err
}
}
return err
}
// CQL connection currently does not support query string arguments
func (dbc *dbConnections) GetCQLConnection(o *DB) error {
dbc.Lock()
defer dbc.Unlock()
// Check if the connection exists
dbSource, err := o.getDataSource()
if err != nil {
return err
}
if val, ok := dbc.m[dbSource]; ok {
*o = *val
return val.err
}
cluster := gocql.NewCluster(o.Hosts...)
if o.Timeout != 0 {
cluster.Timeout = o.Timeout
}
o.Debugf("cql timeout %s", cluster.Timeout)
if o.ConnectTimeout != 0 {
cluster.ConnectTimeout = o.ConnectTimeout
}
o.Debugf("cql connection timeout %s", cluster.ConnectTimeout)
cluster.Port, err = strconv.Atoi(o.Port)
if err != nil {
return fmt.Errorf("atoi: %w", err)
}
if o.DisableInitialHostLookup {
o.Debugf("disable initial host lookup")
cluster.DisableInitialHostLookup = true
}
// Authentication
if o.Authenticator != nil {
cluster.Authenticator = o.Authenticator
} else {
cluster.Authenticator = gocql.PasswordAuthenticator{
Username: o.User,
Password: o.Password,
}
}
cluster.ProtoVersion = 3
// SSL
if o.CaPath != "" {
cluster.SslOpts = &gocql.SslOptions{
CaPath: o.CaPath,
}
}
// Consistency
cluster.Consistency = o.Consistency
// Create keyspace on migration, it should fail if we try to connect to an unmigrated db
if o.Migrate && o.AppEnv == development {
o.Debugf("creating keyspace name")
ts, err := cluster.CreateSession()
if err != nil {
return fmt.Errorf("create session: %v", err)
}
if err := ts.Query(CreateListingsDevKeyspaceStmt(o.DBName)).Exec(); err != nil {
return err
}
}
cluster.Keyspace = o.DBName
ts, err := cluster.CreateSession()
if err != nil {
return fmt.Errorf("create session: %v", err)
}
// Wrap session on creation, gocqlx session embeds gocql.Session pointer.
session := gocqlx.NewSession(ts)
session.Mapper = cqlreflectx.NewMapperTagFunc("json", preMapFunc(o.mapFunc), preMapFunc(o.tagMapFunc))
o.cql = &session
// Add it to the pool so that some other service can reference it
dbc.m[dbSource] = o
// Run migrations
if o.MigratePath != "" && o.Migrate {
o.Debugf("running migrations")
if err := RunMigrations(o); err != nil {
return err
}
}
return err
}
func CreateListingsDevKeyspaceStmt(keyspace string) string {
return `CREATE KEYSPACE IF NOT EXISTS ` + keyspace + ` WITH replication = {'class': 'SimpleStrategy', 'replication_factor' : '1'}`
}
func RunMigrations(o *DB) error {
var driver database.Driver
var err error
switch o.DBSource {
case DBSource_sqlite:
driver, err = sqlite.WithInstance(o.sql.DB, &sqlite.Config{
DatabaseName: o.DBName,
})
if err != nil {
return fmt.Errorf("sqlite instance: %w", err)
}
case DBSource_postgres:
driver, err = postgres.WithInstance(o.sql.DB, &postgres.Config{
DatabaseName: o.DBName,
})
if err != nil {
return fmt.Errorf("postgres instance: %w", err)
}
case DBSource_mysql:
driver, err = mysql.WithInstance(o.sql.DB, &mysql.Config{
DatabaseName: o.DBName,
})
if err != nil {
return fmt.Errorf("mysql instance: %w", err)
}
case DBSource_cql:
driver, err = cassandra.WithInstance(o.cql.Session, &cassandra.Config{
// CQL connection currently does not support query string arguments
// Manually override the multi statments flag
MultiStatementEnabled: true,
KeyspaceName: o.DBName,
})
if err != nil {
return fmt.Errorf("cql instance: %w", err)
}
default:
return errors.New("db driver not supported")
}
var m *migrate.Migrate
if o.MigrateFS != nil {
source, err := iofs.New(o.MigrateFS, o.MigratePath)
if err != nil {
return fmt.Errorf("new fs: %w", err)
}
m, err = migrate.NewWithInstance("iofs", source, o.DBName, driver)
if err != nil {
return fmt.Errorf("fs instance: %w", err)
}
} else {
m, err = migrate.NewWithDatabaseInstance(
o.GetMigratePath(),
o.DBName,
driver,
)
if err != nil {
return fmt.Errorf("migrations instance: %v", err)
}
}
if err := m.Up(); err != nil {
if !errors.Is(err, migrate.ErrNoChange) {
return fmt.Errorf("migrations up: %v", err)
}
o.Debugf("migrate up: %v", err)
}
o.Debugf("migrate up: success")
return nil
}
func preMapFunc(f func(string) string) func(string) string {
return func(s string) string {
ss := strings.Split(s, ",")
out := f(ss[0])
return out
}
}