wehub-resource-sync
255 lines
8.4 KiB
Go
255 lines
8.4 KiB
Go
// Copyright 2024 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package functions
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import (
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"fmt"
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"strconv"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/core"
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"github.com/dolthub/doltgresql/core/id"
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"github.com/dolthub/doltgresql/server/functions/framework"
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"github.com/dolthub/doltgresql/server/settings"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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"github.com/dolthub/doltgresql/utils"
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)
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// initRegclass registers the functions to the catalog.
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func initRegclass() {
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framework.RegisterFunction(regclassin)
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framework.RegisterFunction(regclassout)
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framework.RegisterFunction(regclassrecv)
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framework.RegisterFunction(regclasssend)
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}
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// regclassin represents the PostgreSQL function of regclass type IO input.
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var regclassin = framework.Function1{
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Name: "regclassin",
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Return: pgtypes.Regclass,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Cstring},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val any) (any, error) {
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// If the string just represents a number, then we return it.
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input := val.(string)
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if parsedOid, err := strconv.ParseUint(input, 10, 32); err == nil {
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if internalID := id.Cache().ToInternal(uint32(parsedOid)); internalID.IsValid() {
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return internalID, nil
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}
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return id.NewOID(uint32(parsedOid)).AsId(), nil
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}
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sections, err := ioInputSections(input)
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if err != nil {
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return id.Null, err
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}
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if err = regclass_IoInputValidation(ctx, input, sections); err != nil {
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return id.Null, err
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}
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var database string
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var searchSchemas []string
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var relationName string
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switch len(sections) {
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case 1:
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database = ctx.GetCurrentDatabase()
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searchSchemas, err = core.SearchPath(ctx)
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if err != nil {
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return id.Null, err
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}
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relationName = sections[0]
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case 3:
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database = ctx.GetCurrentDatabase()
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searchSchemas = []string{sections[0]}
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relationName = sections[2]
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case 5:
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database = sections[0]
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searchSchemas = []string{sections[2]}
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relationName = sections[4]
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default:
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return id.Null, errors.Errorf("unexpected input for regclass: %s", input)
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}
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// Iterate over all of the items to find which relation matches.
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// Postgres does not need to worry about name conflicts since everything is created in the same naming space, but
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// GMS and Dolt use different naming spaces, so for now we just ignore potential name conflicts and return the first
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// match found.
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var resultOid id.Id
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err = IterateDatabase(ctx, database, Callbacks{
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Index: func(ctx *sql.Context, schema ItemSchema, table ItemTable, index ItemIndex) (cont bool, err error) {
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idxName := index.Item.ID()
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if idxName == "PRIMARY" {
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idxName = fmt.Sprintf("%s_pkey", index.Item.Table())
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}
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if relationName == idxName {
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resultOid = index.OID.AsId()
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return false, nil
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}
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return true, nil
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},
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Sequence: func(ctx *sql.Context, schema ItemSchema, sequence ItemSequence) (cont bool, err error) {
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if sequence.Item.Id.SequenceName() == relationName {
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resultOid = sequence.OID.AsId()
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return false, nil
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}
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return true, nil
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},
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Table: func(ctx *sql.Context, schema ItemSchema, table ItemTable) (cont bool, err error) {
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if table.Item.Name() == relationName {
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resultOid = table.OID.AsId()
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return false, nil
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}
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return true, nil
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},
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View: func(ctx *sql.Context, schema ItemSchema, view ItemView) (cont bool, err error) {
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if view.Item.Name == relationName {
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resultOid = view.OID.AsId()
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return false, nil
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}
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return true, nil
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},
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SearchSchemas: searchSchemas,
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})
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if err != nil || resultOid.IsValid() {
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return resultOid, err
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}
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return id.Null, errors.Errorf(`relation "%s" does not exist`, input)
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},
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}
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// regclassout represents the PostgreSQL function of regclass type IO output.
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var regclassout = framework.Function1{
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Name: "regclassout",
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Return: pgtypes.Cstring,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Regclass},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val any) (any, error) {
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// Find all the schemas on the search path. If a schema is on the search path, then it is not included in the
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// output of relation name. If the relation's schema is not on the search path, then it is explicitly included.
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schemasMap, err := settings.GetCurrentSchemasAsMap(ctx)
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if err != nil {
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return "", err
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}
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// The pg_catalog schema is always implicitly part of the search path
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// https://www.postgresql.org/docs/current/ddl-schemas.html#DDL-SCHEMAS-CATALOG
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schemasMap["pg_catalog"] = struct{}{}
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input := val.(id.Id)
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if input.Section() == id.Section_OID {
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return input.Segment(0), nil
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}
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var output string
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err = RunCallback(ctx, input, Callbacks{
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Index: func(ctx *sql.Context, schema ItemSchema, table ItemTable, index ItemIndex) (cont bool, err error) {
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output = index.Item.ID()
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if output == "PRIMARY" {
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schemaName := schema.Item.SchemaName()
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if _, ok := schemasMap[schemaName]; ok {
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output = fmt.Sprintf("%s_pkey", index.Item.Table())
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} else {
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output = fmt.Sprintf("%s.%s_pkey", schemaName, index.Item.Table())
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}
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}
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return false, nil
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},
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Sequence: func(ctx *sql.Context, schema ItemSchema, sequence ItemSequence) (cont bool, err error) {
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schemaName := schema.Item.SchemaName()
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if _, ok := schemasMap[schemaName]; ok {
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output = sequence.Item.Id.SequenceName()
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} else {
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output = fmt.Sprintf("%s.%s", schemaName, sequence.Item.Id.SequenceName())
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}
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return false, nil
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},
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Table: func(ctx *sql.Context, schema ItemSchema, table ItemTable) (cont bool, err error) {
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schemaName := schema.Item.SchemaName()
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if _, ok := schemasMap[schemaName]; ok {
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output = table.Item.Name()
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} else {
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output = fmt.Sprintf("%s.%s", schemaName, table.Item.Name())
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}
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return false, nil
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},
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View: func(ctx *sql.Context, schema ItemSchema, view ItemView) (cont bool, err error) {
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schemaName := schema.Item.SchemaName()
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if _, ok := schemasMap[schemaName]; ok {
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output = view.Item.Name
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} else {
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output = fmt.Sprintf("%s.%s", schemaName, view.Item.Name)
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}
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return false, nil
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},
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})
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return output, err
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},
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}
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// regclassrecv represents the PostgreSQL function of regclass type IO receive.
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var regclassrecv = framework.Function1{
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Name: "regclassrecv",
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Return: pgtypes.Regclass,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Internal},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val any) (any, error) {
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data := val.([]byte)
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if data == nil {
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return nil, nil
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}
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reader := utils.NewWireReader(data)
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cachedID := id.Cache().ToInternal(reader.ReadUint32())
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return cachedID, nil
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},
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}
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// regclasssend represents the PostgreSQL function of regclass type IO send.
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var regclasssend = framework.Function1{
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Name: "regclasssend",
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Return: pgtypes.Bytea,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Regclass},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val any) (any, error) {
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writer := utils.NewWireWriter()
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writer.WriteUint32(id.Cache().ToOID(val.(id.Id)))
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return writer.BufferData(), nil
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},
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}
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// regclass_IoInputValidation handles the validation for the parsed sections in regclass_IoInput.
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func regclass_IoInputValidation(ctx *sql.Context, input string, sections []string) error {
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switch len(sections) {
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case 1:
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return nil
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case 3:
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if sections[1] != "." {
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return errors.Errorf("invalid name syntax")
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}
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return nil
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case 5:
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if sections[1] != "." || sections[3] != "." {
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return errors.Errorf("invalid name syntax")
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}
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return nil
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case 7:
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if sections[1] != "." || sections[3] != "." || sections[5] != "." {
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return errors.Errorf("invalid name syntax")
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}
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return errors.Errorf("improper qualified name (too many dotted names): %s", input)
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default:
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return errors.Errorf("invalid name syntax")
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}
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}
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