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driver.go
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driver.go
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package driver
import (
"context"
"database/sql"
"database/sql/driver"
"github.com/alexfalkowski/go-service/database/sql/config"
"github.com/alexfalkowski/go-service/database/sql/driver/trace/opentracing"
dzap "github.com/alexfalkowski/go-service/database/sql/driver/zap"
"github.com/alexfalkowski/go-service/database/sql/metrics/prometheus"
"github.com/alexfalkowski/go-service/errors"
"github.com/alexfalkowski/go-service/version"
"github.com/linxGnu/mssqlx"
"github.com/ngrok/sqlmw"
otr "github.com/opentracing/opentracing-go"
"go.uber.org/fx"
"go.uber.org/zap"
)
// Register the driver for SQL.
func Register(name string, driver driver.Driver, tracer otr.Tracer, logger *zap.Logger) {
var interceptor sqlmw.Interceptor = &sqlmw.NullInterceptor{}
interceptor = opentracing.NewInterceptor(name, tracer, interceptor)
interceptor = dzap.NewInterceptor(name, logger, interceptor)
sql.Register(name, sqlmw.Driver(driver, interceptor))
}
// Open a DB pool.
func Open(lc fx.Lifecycle, name string, cfg config.Config, ver version.Version) (*mssqlx.DBs, error) {
masterDSNs := make([]string, len(cfg.Masters))
for i, m := range cfg.Masters {
masterDSNs[i] = m.URL
}
slaveDSNs := make([]string, len(cfg.Slaves))
for i, s := range cfg.Slaves {
slaveDSNs[i] = s.URL
}
db, err := connect(name, masterDSNs, slaveDSNs)
if err != nil {
return nil, err
}
prometheus.Register(lc, name, db, ver)
lc.Append(fx.Hook{
OnStop: func(ctx context.Context) error {
return destroy(db)
},
})
db.SetConnMaxLifetime(cfg.ConnMaxLifetime)
db.SetMaxIdleConns(cfg.MaxIdleConns)
db.SetMaxOpenConns(cfg.MaxOpenConns)
return db, nil
}
func connect(name string, masterDSNs, slaveDSNs []string) (*mssqlx.DBs, error) {
db, errs := mssqlx.ConnectMasterSlaves(name, masterDSNs, slaveDSNs)
return db, errors.Combine(errs...)
}
func destroy(db *mssqlx.DBs) error {
return errors.Combine(db.Destroy()...)
}