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cassandra.go
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cassandra.go
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package cassandra
import (
"errors"
"fmt"
"os"
"github.com/gocql/gocql"
"github.com/golang-migrate/migrate/v4"
"github.com/golang-migrate/migrate/v4/database/cassandra"
_ "github.com/golang-migrate/migrate/v4/source/file"
)
func NewSession(hosts []string, keyspace string) (*gocql.Session, error) {
if err := createKeyspace(hosts, keyspace); err != nil {
return nil, fmt.Errorf("failed to run migrations: %w", err)
}
cluster := gocql.NewCluster(hosts...)
cluster.Keyspace = keyspace
session, err := cluster.CreateSession()
if err != nil {
return nil, fmt.Errorf("failed to create session: %w", err)
}
databaseInstance, err := cassandra.WithInstance(session, &cassandra.Config{
MigrationsTable: "schema_migrations",
KeyspaceName: keyspace,
MultiStatementEnabled: true,
MultiStatementMaxSize: cassandra.DefaultMultiStatementMaxSize,
})
if err != nil {
return nil, fmt.Errorf("failed to create database instance for migrations: %w", err)
}
m, err := migrate.NewWithDatabaseInstance(fmt.Sprintf("file://migrations/%s", keyspace), "cassandra", databaseInstance)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return session, nil
}
return nil, fmt.Errorf("failed to create migrations: %w", err)
}
if err := m.Up(); err != nil {
if !errors.Is(err, migrate.ErrNoChange) {
return nil, fmt.Errorf("failed to run migrations: %w", err)
}
}
return session, nil
}
func createKeyspace(hosts []string, keyspace string) error {
cluster := gocql.NewCluster(hosts...)
cluster.Keyspace = "system"
session, err := cluster.CreateSession()
if err != nil {
return fmt.Errorf("failed to create session: %w", err)
}
defer session.Close()
if err := session.Query(fmt.Sprintf("CREATE KEYSPACE IF NOT EXISTS %s WITH REPLICATION = {'class': 'SimpleStrategy', 'replication_factor': 1}", keyspace)).Exec(); err != nil {
return fmt.Errorf("failed to create keyspace: %w", err)
}
return nil
}