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connection.go
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connection.go
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package pg
import (
"fmt"
"time"
"github.com/google/uuid"
_ "github.com/jackc/pgx/v4/stdlib" // need to make sure pgx driver is registered before opening connection
"github.com/scylladb/go-reflectx"
"github.com/smartcontractkit/sqlx"
"github.com/smartcontractkit/chainlink/v2/core/store/dialects"
)
type ConnectionConfig interface {
DefaultIdleInTxSessionTimeout() time.Duration
DefaultLockTimeout() time.Duration
MaxOpenConns() int
MaxIdleConns() int
}
func NewConnection(uri string, dialect dialects.DialectName, config ConnectionConfig) (db *sqlx.DB, err error) {
if dialect == dialects.TransactionWrappedPostgres {
// Dbtx uses the uri as a unique identifier for each transaction. Each ORM
// should be encapsulated in it's own transaction, and thus needs its own
// unique id.
//
// We can happily throw away the original uri here because if we are using
// txdb it should have already been set at the point where we called
// txdb.Register
uri = uuid.New().String()
}
// Initialize sql/sqlx
db, err = sqlx.Open(string(dialect), uri)
if err != nil {
return nil, err
}
db.MapperFunc(reflectx.CamelToSnakeASCII)
// Set default connection options
lockTimeout := config.DefaultLockTimeout().Milliseconds()
idleInTxSessionTimeout := config.DefaultIdleInTxSessionTimeout().Milliseconds()
stmt := fmt.Sprintf(`SET TIME ZONE 'UTC'; SET lock_timeout = %d; SET idle_in_transaction_session_timeout = %d; SET default_transaction_isolation = %q`,
lockTimeout, idleInTxSessionTimeout, DefaultIsolation.String())
if _, err = db.Exec(stmt); err != nil {
return nil, err
}
db.SetMaxOpenConns(config.MaxOpenConns())
db.SetMaxIdleConns(config.MaxIdleConns())
return db, disallowReplica(db)
}
func disallowReplica(db *sqlx.DB) error {
var val string
err := db.Get(&val, "SHOW session_replication_role")
if err != nil {
return err
}
if val == "replica" {
return fmt.Errorf("invalid `session_replication_role`: %s. Refusing to connect to replica database. Writing to a replica will corrupt the database", val)
}
return nil
}