genai-toolbox/internal/tools/cloudmonitoring/cloudmonitoring.go

// 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 cloudmonitoring

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"

	"github.com/goccy/go-yaml"
	"github.com/googleapis/genai-toolbox/internal/sources"
	cloudmonitoringsrc "github.com/googleapis/genai-toolbox/internal/sources/cloudmonitoring"
	"github.com/googleapis/genai-toolbox/internal/tools"
	"github.com/googleapis/genai-toolbox/internal/util/parameters"
)

const kind string = "cloud-monitoring-query-prometheus"

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 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.(*cloudmonitoringsrc.Source)
	if !ok {
		return nil, fmt.Errorf("invalid source for %q tool: source kind must be `cloudmonitoring`", kind)
	}

	// Define the parameters internally instead of from the config file.
	allParameters := parameters.Parameters{
		parameters.NewStringParameterWithRequired("projectId", "The Id of the Google Cloud project.", true),
		parameters.NewStringParameterWithRequired("query", "The promql query to execute.", true),
	}

	mcpManifest := tools.GetMcpManifest(cfg.Name, cfg.Description, cfg.AuthRequired, allParameters, nil)

	return Tool{
		Config:      cfg,
		AllParams:   allParameters,
		BaseURL:     s.BaseURL,
		UserAgent:   s.UserAgent,
		Client:      s.Client,
		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"`
	BaseURL     string                `yaml:"baseURL"`
	UserAgent   string
	Client      *http.Client
	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) {
	paramsMap := params.AsMap()
	projectID, ok := paramsMap["projectId"].(string)
	if !ok {
		return nil, fmt.Errorf("projectId parameter not found or not a string")
	}
	query, ok := paramsMap["query"].(string)
	if !ok {
		return nil, fmt.Errorf("query parameter not found or not a string")
	}

	url := fmt.Sprintf("%s/v1/projects/%s/location/global/prometheus/api/v1/query", t.BaseURL, projectID)

	req, err := http.NewRequest(http.MethodGet, url, nil)
	if err != nil {
		return nil, err
	}

	q := req.URL.Query()
	q.Add("query", query)
	req.URL.RawQuery = q.Encode()

	req.Header.Set("User-Agent", t.UserAgent)

	resp, err := t.Client.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response body: %w", err)
	}

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("request failed: %s, body: %s", resp.Status, string(body))
	}

	if len(body) == 0 {
		return nil, nil
	}

	var result map[string]any
	if err := json.Unmarshal(body, &result); err != nil {
		return nil, fmt.Errorf("failed to unmarshal json: %w, body: %s", err, string(body))
	}

	return result, 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 true
}

func (t Tool) RequiresClientAuthorization(resourceMgr tools.SourceProvider) bool {
	return false
}

func (t Tool) GetAuthTokenHeaderName() string {
	return "Authorization"
}