MCP Toolbox for Databases

// 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 postgreslistpublicationtables import ( "context" "fmt" yaml "github.com/goccy/go-yaml" "github.com/googleapis/genai-toolbox/internal/sources" "github.com/googleapis/genai-toolbox/internal/tools" "github.com/googleapis/genai-toolbox/internal/util/parameters" "github.com/jackc/pgx/v5/pgxpool" ) const kind string = "postgres-list-publication-tables" const listPublicationTablesStatement = ` WITH publication_details AS ( SELECT pt.pubname AS publication_name, pt.schemaname AS schema_name, pt.tablename AS table_name, -- Definition details p.puballtables AS publishes_all_tables, p.pubinsert AS publishes_inserts, p.pubupdate AS publishes_updates, p.pubdelete AS publishes_deletes, p.pubtruncate AS publishes_truncates, -- Owner information pg_catalog.pg_get_userbyid(p.pubowner) AS publication_owner FROM pg_catalog.pg_publication_tables pt JOIN pg_catalog.pg_publication p ON pt.pubname = p.pubname ) SELECT * FROM publication_details WHERE (NULLIF(TRIM($1::text), '') IS NULL OR table_name = ANY(regexp_split_to_array(TRIM($1::text), '\s*,\s*'))) AND (NULLIF(TRIM($2::text), '') IS NULL OR publication_name = ANY(regexp_split_to_array(TRIM($2::text), '\s*,\s*'))) AND (NULLIF(TRIM($3::text), '') IS NULL OR schema_name = ANY(regexp_split_to_array(TRIM($3::text), '\s*,\s*'))) ORDER BY publication_name, schema_name, table_name LIMIT COALESCE($4::int, 50); ` 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 { PostgresPool() *pgxpool.Pool } 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"` 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) { allParameters := parameters.Parameters{ parameters.NewStringParameterWithDefault("table_names", "", "Optional: Filters by a comma-separated list of table names."), parameters.NewStringParameterWithDefault("publication_names", "", "Optional: Filters by a comma-separated list of publication names."), parameters.NewStringParameterWithDefault("schema_names", "", "Optional: Filters by a comma-separated list of schema names."), parameters.NewIntParameterWithDefault("limit", 50, "Optional: The maximum number of rows to return."), } description := cfg.Description if description == "" { description = "Lists all publication tables in the database. Returns the publication name, schema name, and table name, along with definition details indicating if it publishes all tables, whether it replicates inserts, updates, deletes, or truncates, and the publication owner." } mcpManifest := tools.GetMcpManifest(cfg.Name, description, cfg.AuthRequired, allParameters, nil) // finish tool setup return Tool{ Config: cfg, allParams: allParameters, manifest: tools.Manifest{ Description: cfg.Description, Parameters: allParameters.Manifest(), AuthRequired: cfg.AuthRequired, }, mcpManifest: mcpManifest, }, nil } // validate interface var _ tools.Tool = Tool{} type Tool struct { Config allParams parameters.Parameters `yaml:"allParams"` manifest tools.Manifest mcpManifest tools.McpManifest } func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) { source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Kind) if err != nil { return nil, err } paramsMap := params.AsMap() newParams, err := parameters.GetParams(t.allParams, paramsMap) if err != nil { return nil, fmt.Errorf("unable to extract standard params %w", err) } sliceParams := newParams.AsSlice() results, err := source.PostgresPool().Query(ctx, listPublicationTablesStatement, sliceParams...) if err != nil { return nil, fmt.Errorf("unable to execute query: %w", err) } defer results.Close() fields := results.FieldDescriptions() var out []map[string]any for results.Next() { values, err := results.Values() if err != nil { return nil, fmt.Errorf("unable to parse row: %w", err) } rowMap := make(map[string]any) for i, field := range fields { rowMap[string(field.Name)] = values[i] } out = append(out, rowMap) } if err := results.Err(); err != nil { return err.Error(), fmt.Errorf("unable to execute query: %w", err) } return out, nil } func (t Tool) ParseParams(data map[string]any, claims map[string]map[string]any) (parameters.ParamValues, error) { return parameters.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(resourceMgr tools.SourceProvider) (bool, error) { return false, nil } func (t Tool) ToConfig() tools.ToolConfig { return t.Config } func (t Tool) GetAuthTokenHeaderName(resourceMgr tools.SourceProvider) (string, error) { return "Authorization", nil }