mysqllisttables.go•14.6 kB
// Copyright 2025 Google LLC
//
// Licensed 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 mysqllisttables
import (
"context"
"database/sql"
"fmt"
yaml "github.com/goccy/go-yaml"
"github.com/googleapis/genai-toolbox/internal/sources"
"github.com/googleapis/genai-toolbox/internal/sources/cloudsqlmysql"
"github.com/googleapis/genai-toolbox/internal/sources/mysql"
"github.com/googleapis/genai-toolbox/internal/tools"
"github.com/googleapis/genai-toolbox/internal/tools/mysql/mysqlcommon"
)
const kind string = "mysql-list-tables"
const listTablesStatement = `
SELECT
T.TABLE_SCHEMA AS schema_name,
T.TABLE_NAME AS object_name,
CASE
WHEN @output_format = 'simple' THEN
JSON_OBJECT('name', T.TABLE_NAME)
ELSE
CONVERT(
JSON_OBJECT(
'schema_name', T.TABLE_SCHEMA,
'object_name', T.TABLE_NAME,
'object_type', 'TABLE',
'owner', (
SELECT
IFNULL(U.GRANTEE, 'N/A')
FROM
INFORMATION_SCHEMA.SCHEMA_PRIVILEGES U
WHERE
U.TABLE_SCHEMA = T.TABLE_SCHEMA
LIMIT 1
),
'comment', IFNULL(T.TABLE_COMMENT, ''),
'columns', (
SELECT
IFNULL(
JSON_ARRAYAGG(
JSON_OBJECT(
'column_name', C.COLUMN_NAME,
'data_type', C.COLUMN_TYPE,
'ordinal_position', C.ORDINAL_POSITION,
'is_not_nullable', IF(C.IS_NULLABLE = 'NO', TRUE, FALSE),
'column_default', C.COLUMN_DEFAULT,
'column_comment', IFNULL(C.COLUMN_COMMENT, '')
)
),
JSON_ARRAY()
)
FROM
INFORMATION_SCHEMA.COLUMNS C
WHERE
C.TABLE_SCHEMA = T.TABLE_SCHEMA AND C.TABLE_NAME = T.TABLE_NAME
ORDER BY C.ORDINAL_POSITION
),
'constraints', (
SELECT
IFNULL(
JSON_ARRAYAGG(
JSON_OBJECT(
'constraint_name', TC.CONSTRAINT_NAME,
'constraint_type',
CASE TC.CONSTRAINT_TYPE
WHEN 'PRIMARY KEY' THEN 'PRIMARY KEY'
WHEN 'FOREIGN KEY' THEN 'FOREIGN KEY'
WHEN 'UNIQUE' THEN 'UNIQUE'
ELSE TC.CONSTRAINT_TYPE
END,
'constraint_definition', '',
'constraint_columns', (
SELECT
IFNULL(JSON_ARRAYAGG(KCU.COLUMN_NAME), JSON_ARRAY())
FROM
INFORMATION_SCHEMA.KEY_COLUMN_USAGE KCU
WHERE
KCU.CONSTRAINT_SCHEMA = TC.CONSTRAINT_SCHEMA
AND KCU.CONSTRAINT_NAME = TC.CONSTRAINT_NAME
AND KCU.TABLE_NAME = TC.TABLE_NAME
ORDER BY KCU.ORDINAL_POSITION
),
'foreign_key_referenced_table', IF(TC.CONSTRAINT_TYPE = 'FOREIGN KEY', RC.REFERENCED_TABLE_NAME, NULL),
'foreign_key_referenced_columns', IF(TC.CONSTRAINT_TYPE = 'FOREIGN KEY',
(SELECT IFNULL(JSON_ARRAYAGG(FKCU.REFERENCED_COLUMN_NAME), JSON_ARRAY())
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE FKCU
WHERE FKCU.CONSTRAINT_SCHEMA = TC.CONSTRAINT_SCHEMA
AND FKCU.CONSTRAINT_NAME = TC.CONSTRAINT_NAME
AND FKCU.TABLE_NAME = TC.TABLE_NAME
AND FKCU.REFERENCED_TABLE_NAME IS NOT NULL
ORDER BY FKCU.ORDINAL_POSITION),
NULL
)
)
),
JSON_ARRAY()
)
FROM
INFORMATION_SCHEMA.TABLE_CONSTRAINTS TC
LEFT JOIN
INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS RC
ON TC.CONSTRAINT_SCHEMA = RC.CONSTRAINT_SCHEMA
AND TC.CONSTRAINT_NAME = RC.CONSTRAINT_NAME
AND TC.TABLE_NAME = RC.TABLE_NAME
WHERE
TC.TABLE_SCHEMA = T.TABLE_SCHEMA AND TC.TABLE_NAME = T.TABLE_NAME
),
'indexes', (
SELECT
IFNULL(
JSON_ARRAYAGG(
JSON_OBJECT(
'index_name', IndexData.INDEX_NAME,
'is_unique', IF(IndexData.NON_UNIQUE = 0, TRUE, FALSE),
'is_primary', IF(IndexData.INDEX_NAME = 'PRIMARY', TRUE, FALSE),
'index_columns', IFNULL(IndexData.INDEX_COLUMNS_ARRAY, JSON_ARRAY())
)
),
JSON_ARRAY()
)
FROM (
SELECT
S.TABLE_SCHEMA,
S.TABLE_NAME,
S.INDEX_NAME,
MIN(S.NON_UNIQUE) AS NON_UNIQUE,
JSON_ARRAYAGG(S.COLUMN_NAME) AS INDEX_COLUMNS_ARRAY
FROM
INFORMATION_SCHEMA.STATISTICS S
GROUP BY
S.TABLE_SCHEMA, S.TABLE_NAME, S.INDEX_NAME
) AS IndexData
WHERE IndexData.TABLE_SCHEMA = T.TABLE_SCHEMA AND IndexData.TABLE_NAME = T.TABLE_NAME
ORDER BY IndexData.INDEX_NAME
),
'triggers', (
SELECT
IFNULL(
JSON_ARRAYAGG(
JSON_OBJECT(
'trigger_name', TR.TRIGGER_NAME,
'trigger_definition', TR.ACTION_STATEMENT
)
),
JSON_ARRAY()
)
FROM
INFORMATION_SCHEMA.TRIGGERS TR
WHERE
TR.EVENT_OBJECT_SCHEMA = T.TABLE_SCHEMA AND TR.EVENT_OBJECT_TABLE = T.TABLE_NAME
ORDER BY TR.TRIGGER_NAME
)
)
USING utf8mb4)
END AS object_details
FROM
INFORMATION_SCHEMA.TABLES T
CROSS JOIN (SELECT @table_names := ?, @output_format := ?) AS variables
WHERE
T.TABLE_SCHEMA NOT IN ('mysql', 'information_schema', 'performance_schema', 'sys')
AND (NULLIF(TRIM(@table_names), '') IS NULL OR FIND_IN_SET(T.TABLE_NAME, @table_names))
AND T.TABLE_TYPE = 'BASE TABLE'
ORDER BY
T.TABLE_SCHEMA, T.TABLE_NAME;
`
func init() {
if !tools.Register(kind, newConfig) {
panic(fmt.Sprintf("tool kind %q already registered", kind))
}
}
func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
actual := Config{Name: name}
if err := decoder.DecodeContext(ctx, &actual); err != nil {
return nil, err
}
return actual, nil
}
type compatibleSource interface {
MySQLPool() *sql.DB
}
// validate compatible sources are still compatible
var _ compatibleSource = &cloudsqlmysql.Source{}
var _ compatibleSource = &mysql.Source{}
var compatibleSources = [...]string{cloudsqlmysql.SourceKind, mysql.SourceKind}
type Config struct {
Name string `yaml:"name" validate:"required"`
Kind string `yaml:"kind" validate:"required"`
Source string `yaml:"source" validate:"required"`
Description string `yaml:"description" validate:"required"`
AuthRequired []string `yaml:"authRequired"`
}
// validate interface
var _ tools.ToolConfig = Config{}
func (cfg Config) ToolConfigKind() string {
return kind
}
func (cfg Config) Initialize(srcs map[string]sources.Source) (tools.Tool, error) {
// verify source exists
rawS, ok := srcs[cfg.Source]
if !ok {
return nil, fmt.Errorf("no source named %q configured", cfg.Source)
}
// verify the source is compatible
s, ok := rawS.(compatibleSource)
if !ok {
return nil, fmt.Errorf("invalid source for %q tool: source kind must be one of %q", kind, compatibleSources)
}
allParameters := tools.Parameters{
tools.NewStringParameterWithDefault("table_names", "", "Optional: A comma-separated list of table names. If empty, details for all tables will be listed."),
tools.NewStringParameterWithDefault("output_format", "detailed", "Optional: Use 'simple' for names only or 'detailed' for full info."),
}
paramManifest := allParameters.Manifest()
mcpManifest := tools.GetMcpManifest(cfg.Name, cfg.Description, cfg.AuthRequired, allParameters)
// finish tool setup
t := Tool{
Name: cfg.Name,
Kind: kind,
AllParams: allParameters,
AuthRequired: cfg.AuthRequired,
Pool: s.MySQLPool(),
manifest: tools.Manifest{Description: cfg.Description, Parameters: paramManifest, AuthRequired: cfg.AuthRequired},
mcpManifest: mcpManifest,
}
return t, nil
}
// validate interface
var _ tools.Tool = Tool{}
type Tool struct {
Name string `yaml:"name"`
Kind string `yaml:"kind"`
AuthRequired []string `yaml:"authRequired"`
AllParams tools.Parameters `yaml:"allParams"`
Pool *sql.DB
manifest tools.Manifest
mcpManifest tools.McpManifest
}
func (t Tool) Invoke(ctx context.Context, params tools.ParamValues, accessToken tools.AccessToken) (any, error) {
paramsMap := params.AsMap()
tableNames, ok := paramsMap["table_names"].(string)
if !ok {
return nil, fmt.Errorf("invalid '%s' parameter; expected a string", tableNames)
}
outputFormat, _ := paramsMap["output_format"].(string)
if outputFormat != "simple" && outputFormat != "detailed" {
return nil, fmt.Errorf("invalid value for output_format: must be 'simple' or 'detailed', but got %q", outputFormat)
}
results, err := t.Pool.QueryContext(ctx, listTablesStatement, tableNames, outputFormat)
if err != nil {
return nil, fmt.Errorf("unable to execute query: %w", err)
}
cols, err := results.Columns()
if err != nil {
return nil, fmt.Errorf("unable to retrieve rows column name: %w", err)
}
// create an array of values for each column, which can be re-used to scan each row
rawValues := make([]any, len(cols))
values := make([]any, len(cols))
for i := range rawValues {
values[i] = &rawValues[i]
}
defer results.Close()
colTypes, err := results.ColumnTypes()
if err != nil {
return nil, fmt.Errorf("unable to get column types: %w", err)
}
var out []any
for results.Next() {
err := results.Scan(values...)
if err != nil {
return nil, fmt.Errorf("unable to parse row: %w", err)
}
vMap := make(map[string]any)
for i, name := range cols {
val := rawValues[i]
if val == nil {
vMap[name] = nil
continue
}
vMap[name], err = mysqlcommon.ConvertToType(colTypes[i], val)
if err != nil {
return nil, fmt.Errorf("errors encountered when converting values: %w", err)
}
}
out = append(out, vMap)
}
if err := results.Err(); err != nil {
return nil, fmt.Errorf("errors encountered during row iteration: %w", err)
}
return out, nil
}
func (t Tool) ParseParams(data map[string]any, claims map[string]map[string]any) (tools.ParamValues, error) {
return tools.ParseParams(t.AllParams, data, claims)
}
func (t Tool) Manifest() tools.Manifest {
return t.manifest
}
func (t Tool) McpManifest() tools.McpManifest {
return t.mcpManifest
}
func (t Tool) Authorized(verifiedAuthServices []string) bool {
return tools.IsAuthorized(t.AuthRequired, verifiedAuthServices)
}
func (t Tool) RequiresClientAuthorization() bool {
return false
}