zeroshade commented on code in PR #246: URL: https://github.com/apache/iceberg-go/pull/246#discussion_r1932844716
########## catalog/sql/sql.go: ########## @@ -0,0 +1,712 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +package sql + +import ( + "context" + "database/sql" + "errors" + "fmt" + "maps" + "path" + "slices" + "strings" + "sync" + _ "unsafe" + + "github.com/apache/iceberg-go" + "github.com/apache/iceberg-go/catalog" + "github.com/apache/iceberg-go/catalog/internal" + "github.com/apache/iceberg-go/io" + "github.com/apache/iceberg-go/table" + "github.com/uptrace/bun" + "github.com/uptrace/bun/dialect/feature" + "github.com/uptrace/bun/dialect/mssqldialect" + "github.com/uptrace/bun/dialect/mysqldialect" + "github.com/uptrace/bun/dialect/oracledialect" + "github.com/uptrace/bun/dialect/pgdialect" + "github.com/uptrace/bun/dialect/sqlitedialect" + "github.com/uptrace/bun/extra/bundebug" + "github.com/uptrace/bun/schema" +) + +type SupportedDialect string + +const ( + Postgres SupportedDialect = "postgres" + MySQL SupportedDialect = "mysql" + SQLite SupportedDialect = "sqlite" + MSSQL SupportedDialect = "mssql" + Oracle SupportedDialect = "oracle" +) + +const ( + DialectKey = "sql.dialect" + DriverKey = "sql.driver" + initCatalogTablesKey = "init_catalog_tables" +) + +func init() { + catalog.Register("sql", catalog.RegistrarFunc(func(name string, p iceberg.Properties) (c catalog.Catalog, err error) { + driver, ok := p[DriverKey] + if !ok { + return nil, errors.New("must provide driver to pass to sql.Open") + } + + dialect := strings.ToLower(p[DialectKey]) + if dialect == "" { + return nil, errors.New("must provide sql dialect to use") + } + + uri := strings.TrimPrefix(p.Get("uri", ""), "sql://") + sqldb, err := sql.Open(driver, uri) + if err != nil { + return nil, err + } + + defer func() { + if r := recover(); r != nil { + err = fmt.Errorf("failed to create SQL catalog: %v", r) + } + }() + + return NewCatalog(p.Get(name, "sql"), sqldb, SupportedDialect(dialect), p) + })) +} + +var ( + _ catalog.Catalog = (*Catalog)(nil) +) + +var ( + minimalNamespaceProps = iceberg.Properties{"exists": "true"} + + dialects = map[SupportedDialect]schema.Dialect{} + dialectMx sync.Mutex +) + +func createDialect(d SupportedDialect) schema.Dialect { + switch d { + case Postgres: + return pgdialect.New() + case MySQL: + return mysqldialect.New() + case SQLite: + return sqlitedialect.New() + case MSSQL: + return mssqldialect.New() + case Oracle: + return oracledialect.New() + default: + panic("unsupported sql dialect") + } +} + +func getDialect(d SupportedDialect) schema.Dialect { + dialectMx.Lock() + defer dialectMx.Unlock() + ret, ok := dialects[d] + if !ok { + ret = createDialect(d) + dialects[d] = ret + } + return ret +} + +type sqlIcebergTable struct { + bun.BaseModel `bun:"table:iceberg_tables"` + + CatalogName string `bun:",pk"` + TableNamespace string `bun:",pk"` + TableName string `bun:",pk"` + MetadataLocation sql.NullString + PreviousMetadataLocation sql.NullString +} + +type sqlIcebergNamespaceProps struct { + bun.BaseModel `bun:"table:iceberg_namespace_properties"` + + CatalogName string `bun:",pk"` + Namespace string `bun:",pk"` + PropertyKey string `bun:",pk"` + PropertyValue sql.NullString +} + +func withReadTx[R any](ctx context.Context, db *bun.DB, fn func(context.Context, bun.Tx) (R, error)) (result R, err error) { + db.RunInTx(ctx, &sql.TxOptions{ReadOnly: true}, func(ctx context.Context, tx bun.Tx) error { + result, err = fn(ctx, tx) + return err + }) + return +} + +func withWriteTx(ctx context.Context, db *bun.DB, fn func(context.Context, bun.Tx) error) error { + return db.RunInTx(ctx, &sql.TxOptions{Isolation: sql.LevelLinearizable}, func(ctx context.Context, tx bun.Tx) error { + return fn(ctx, tx) + }) +} + +type Catalog struct { + db *bun.DB + name string + props iceberg.Properties +} + +// NewCatalog creates a new sql-based catalog using the provided sql.DB handle to perform any queries. +// +// The dialect parameter determines the SQL dialect to use for query generation and must be one of the +// supported dialects, i.e. one of the exported SupportedDialect values. The separation here allows for +// the use of different drivers/databases provided they support the chosen sql dialect (e.g. if a particular +// database supports the MySQL dialect, then the database can still be used with this catalog even though +// it's not explicitly implemented). +// +// If the "init_catalog_tables" property is set to "true", then creating the catalog will also attempt to +// to verify whether the necessary tables (iceberg_tables and iceberg_namespace_properties) exist, creating +// them if they do not already exist. +// +// The environment variable ICEBERG_SQL_DEBUG can be set to automatically log the sql queries to the terminal: +// - ICEBERG_SQL_DEBUG=1 logs only failed queries +// - ICEBERG_SQL_DEBUG=2 logs all queries +// +// All interactions with the db are performed within transactions to ensure atomicity and transactional isolation +// of catalog changes. +func NewCatalog(name string, db *sql.DB, dialect SupportedDialect, props iceberg.Properties) (*Catalog, error) { + cat := &Catalog{db: bun.NewDB(db, getDialect(dialect)), name: name, props: props} + + cat.db.AddQueryHook(bundebug.NewQueryHook( + bundebug.WithEnabled(false), + // ICEBERG_SQL_DEBUG=1 logs only failed queries + // ICEBERG_SQL_DEBUG=2 log all queries + bundebug.FromEnv("ICEBERG_SQL_DEBUG"))) + + if cat.props.GetBool(initCatalogTablesKey, true) { + return cat, cat.ensureTablesExist() + } + + return cat, nil +} + +func (c *Catalog) Name() string { return c.name } + +func (c *Catalog) CatalogType() catalog.Type { + return catalog.SQL +} + +func (c *Catalog) CreateSQLTables(ctx context.Context) error { + _, err := c.db.NewCreateTable().Model((*sqlIcebergTable)(nil)). + IfNotExists().Exec(ctx) + if err != nil { + return err + } + + _, err = c.db.NewCreateTable().Model((*sqlIcebergNamespaceProps)(nil)). + IfNotExists().Exec(ctx) + return err +} + +func (c *Catalog) DropSQLTables(ctx context.Context) error { + _, err := c.db.NewDropTable().Model((*sqlIcebergTable)(nil)). + IfExists().Exec(ctx) + if err != nil { + return err + } + + _, err = c.db.NewDropTable().Model((*sqlIcebergNamespaceProps)(nil)). + IfExists().Exec(ctx) + return err +} + +func (c *Catalog) ensureTablesExist() error { + return c.CreateSQLTables(context.Background()) +} + +func (c *Catalog) namespaceExists(ctx context.Context, ns string) (bool, error) { + return withReadTx(ctx, c.db, func(ctx context.Context, tx bun.Tx) (bool, error) { + exists, err := tx.NewSelect().Model((*sqlIcebergTable)(nil)). + Where("catalog_name = ?", c.name). + Where("table_namespace = ?", ns). + Limit(1).Exists(ctx) + if err != nil { + return false, err + } + if exists { + return true, nil + } + + return tx.NewSelect().Model((*sqlIcebergNamespaceProps)(nil)). + Where("catalog_name = ?", c.name).Where("namespace = ?", ns). + Limit(1).Exists(ctx) + }) +} + +func (c *Catalog) getDefaultWarehouseLocation(ctx context.Context, nsname, tableName string) (string, error) { + dbprops, err := c.LoadNamespaceProperties(ctx, strings.Split(nsname, ".")) + if err != nil { + return "", err + } + + if dblocation := dbprops.Get("location", ""); dblocation != "" { + return path.Join(dblocation, tableName), nil + } + + if warehousepath := c.props.Get("warehouse", ""); warehousepath != "" { + return warehousepath + "/" + path.Join(nsname+".db", tableName), nil + } + + return "", errors.New("no default path set, please specify a location when creating a table") +} + +func (c *Catalog) resolveTableLocation(ctx context.Context, loc, nsname, tablename string) (string, error) { + if len(loc) == 0 { + return c.getDefaultWarehouseLocation(ctx, nsname, tablename) + } + + return strings.TrimSuffix(loc, "/"), nil +} + +func checkValidNamespace(ident table.Identifier) error { + if len(ident) < 1 { + return fmt.Errorf("%w: empty namespace identifier", catalog.ErrNoSuchNamespace) + } + return nil +} + +func (c *Catalog) CreateTable(ctx context.Context, ident table.Identifier, sc *iceberg.Schema, opts ...catalog.CreateTableOpt) (*table.Table, error) { + var cfg internal.CreateTableCfg + for _, opt := range opts { + opt(&cfg) + } + + nsIdent := catalog.NamespaceFromIdent(ident) + tblIdent := catalog.TableNameFromIdent(ident) + ns := strings.Join(nsIdent, ".") + exists, err := c.namespaceExists(ctx, ns) + if err != nil { + return nil, err + } + + if !exists { + return nil, fmt.Errorf("%w: %s", catalog.ErrNoSuchNamespace, ns) + } + + loc, err := c.resolveTableLocation(ctx, cfg.Location, ns, tblIdent) + if err != nil { + return nil, err + } + + metadataLocation := internal.GetMetadataLoc(loc, 0) + metadata, err := table.NewMetadata(sc, cfg.PartitionSpec, cfg.SortOrder, loc, cfg.Properties) + if err != nil { + return nil, err + } + + if err := internal.WriteMetadata(metadata, metadataLocation, c.props); err != nil { + return nil, err + } + + err = withWriteTx(ctx, c.db, func(ctx context.Context, tx bun.Tx) error { + _, err := tx.NewInsert().Model(&sqlIcebergTable{ + CatalogName: c.name, + TableNamespace: ns, + TableName: tblIdent, + MetadataLocation: sql.NullString{String: metadataLocation, Valid: true}, + }).Exec(ctx) + + if err != nil { + return fmt.Errorf("failed to create table: %w", err) + } + return nil + }) + + if err != nil { + return nil, err + } + + return c.LoadTable(ctx, ident, cfg.Properties) +} + +func (c *Catalog) CommitTable(ctx context.Context, tbl *table.Table, reqs []table.Requirement, updates []table.Update) (table.Metadata, string, error) { + panic("commit table not implemented for SQLCatalog") Review Comment: that's the pattern we've been doing so far. if it would be preferable to have the unimplemented methods return a `NotYetImplemented` error, then I can change all of them (for all the catalogs) in a follow up PR rather than increase the size of this PR. -- This is an automated message from the Apache Git Service. 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