neo4jexecutecypher.go•5.48 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 neo4jexecutecypher
import (
"context"
"fmt"
"github.com/goccy/go-yaml"
"github.com/googleapis/genai-toolbox/internal/sources"
neo4jsc "github.com/googleapis/genai-toolbox/internal/sources/neo4j"
"github.com/googleapis/genai-toolbox/internal/tools"
"github.com/googleapis/genai-toolbox/internal/tools/neo4j/neo4jexecutecypher/classifier"
"github.com/googleapis/genai-toolbox/internal/tools/neo4j/neo4jschema/helpers"
"github.com/neo4j/neo4j-go-driver/v5/neo4j"
)
const kind string = "neo4j-execute-cypher"
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 {
Neo4jDriver() neo4j.DriverWithContext
Neo4jDatabase() string
}
// validate compatible sources are still compatible
var _ compatibleSource = &neo4jsc.Source{}
var compatibleSources = [...]string{neo4jsc.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"`
ReadOnly bool `yaml:"readOnly"`
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
var s compatibleSource
s, ok = rawS.(compatibleSource)
if !ok {
return nil, fmt.Errorf("invalid source for %q tool: source kind must be one of %q", kind, compatibleSources)
}
cypherParameter := tools.NewStringParameter("cypher", "The cypher to execute.")
parameters := tools.Parameters{cypherParameter}
mcpManifest := tools.GetMcpManifest(cfg.Name, cfg.Description, cfg.AuthRequired, parameters)
// finish tool setup
t := Tool{
Name: cfg.Name,
Kind: kind,
Parameters: parameters,
AuthRequired: cfg.AuthRequired,
ReadOnly: cfg.ReadOnly,
Driver: s.Neo4jDriver(),
Database: s.Neo4jDatabase(),
classifier: classifier.NewQueryClassifier(),
manifest: tools.Manifest{Description: cfg.Description, Parameters: parameters.Manifest(), 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"`
Parameters tools.Parameters `yaml:"parameters"`
AuthRequired []string `yaml:"authRequired"`
ReadOnly bool `yaml:"readOnly"`
Database string
Driver neo4j.DriverWithContext
classifier *classifier.QueryClassifier
manifest tools.Manifest
mcpManifest tools.McpManifest
}
func (t Tool) Invoke(ctx context.Context, params tools.ParamValues, accessToken tools.AccessToken) (any, error) {
paramsMap := params.AsMap()
cypherStr, ok := paramsMap["cypher"].(string)
if !ok {
return nil, fmt.Errorf("unable to get cast %s", paramsMap["cypher"])
}
if cypherStr == "" {
return nil, fmt.Errorf("parameter 'cypher' must be a non-empty string")
}
// validate the cypher query before executing
cf := t.classifier.Classify(cypherStr)
if cf.Error != nil {
return nil, cf.Error
}
if cf.Type == classifier.WriteQuery && t.ReadOnly {
return nil, fmt.Errorf("this tool is read-only and cannot execute write queries")
}
config := neo4j.ExecuteQueryWithDatabase(t.Database)
results, err := neo4j.ExecuteQuery(ctx, t.Driver, cypherStr, nil,
neo4j.EagerResultTransformer, config)
if err != nil {
return nil, fmt.Errorf("unable to execute query: %w", err)
}
var out []any
keys := results.Keys
records := results.Records
for _, record := range records {
vMap := make(map[string]any)
for col, value := range record.Values {
vMap[keys[col]] = helpers.ConvertValue(value)
}
out = append(out, vMap)
}
return out, nil
}
func (t Tool) ParseParams(data map[string]any, claimsMap map[string]map[string]any) (tools.ParamValues, error) {
return tools.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() bool {
return false
}