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 dgraph import ( "context" "encoding/json" "fmt" yaml "github.com/goccy/go-yaml" "github.com/googleapis/genai-toolbox/internal/sources" "github.com/googleapis/genai-toolbox/internal/sources/dgraph" "github.com/googleapis/genai-toolbox/internal/tools" "github.com/googleapis/genai-toolbox/internal/util/parameters" ) const kind string = "dgraph-dql" 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 { DgraphClient() *dgraph.DgraphClient } 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"` Statement string `yaml:"statement" validate:"required"` AuthRequired []string `yaml:"authRequired"` IsQuery bool `yaml:"isQuery"` Timeout string `yaml:"timeout"` Parameters parameters.Parameters `yaml:"parameters"` } // 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) { mcpManifest := tools.GetMcpManifest(cfg.Name, cfg.Description, cfg.AuthRequired, cfg.Parameters, nil) // finish tool setup t := Tool{ Config: cfg, manifest: tools.Manifest{Description: cfg.Description, Parameters: cfg.Parameters.Manifest(), AuthRequired: cfg.AuthRequired}, mcpManifest: mcpManifest, } return t, nil } // validate interface var _ tools.Tool = Tool{} type Tool struct { Config manifest tools.Manifest mcpManifest tools.McpManifest } func (t Tool) ToConfig() tools.ToolConfig { return t.Config } 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.AsMapWithDollarPrefix() resp, err := source.DgraphClient().ExecuteQuery(t.Statement, paramsMap, t.IsQuery, t.Timeout) if err != nil { return nil, err } if err := dgraph.CheckError(resp); err != nil { return nil, err } var result struct { Data map[string]interface{} `json:"data"` } if err := json.Unmarshal(resp, &result); err != nil { return nil, fmt.Errorf("error parsing JSON: %v", err) } return result.Data, nil } func (t Tool) ParseParams(data map[string]any, claimsMap map[string]map[string]any) (parameters.ParamValues, error) { return parameters.ParseParams(t.Parameters, data, claimsMap) } 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) GetAuthTokenHeaderName(resourceMgr tools.SourceProvider) (string, error) { return "Authorization", nil }