// 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"
"github.com/googleapis/genai-toolbox/internal/util"
"go.opentelemetry.io/otel/trace"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
monitoring "google.golang.org/api/monitoring/v3"
)
const SourceKind string = "cloud-monitoring"
// validate interface
var _ sources.SourceConfig = Config{}
func init() {
if !sources.Register(SourceKind, newConfig) {
panic(fmt.Sprintf("source kind %q already registered", SourceKind))
}
}
func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (sources.SourceConfig, 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"`
UseClientOAuth bool `yaml:"useClientOAuth"`
}
func (r Config) SourceConfigKind() string {
return SourceKind
}
// Initialize initializes a Cloud Monitoring Source instance.
func (r Config) Initialize(ctx context.Context, tracer trace.Tracer) (sources.Source, error) {
ua, err := util.UserAgentFromContext(ctx)
if err != nil {
return nil, fmt.Errorf("error in User Agent retrieval: %s", err)
}
var client *http.Client
if r.UseClientOAuth {
client = &http.Client{
Transport: util.NewUserAgentRoundTripper(ua, http.DefaultTransport),
}
} else {
// Use Application Default Credentials
creds, err := google.FindDefaultCredentials(ctx, monitoring.MonitoringScope)
if err != nil {
return nil, fmt.Errorf("failed to find default credentials: %w", err)
}
baseClient := oauth2.NewClient(ctx, creds.TokenSource)
baseClient.Transport = util.NewUserAgentRoundTripper(ua, baseClient.Transport)
client = baseClient
}
s := &Source{
Config: r,
baseURL: "https://monitoring.googleapis.com",
client: client,
userAgent: ua,
}
return s, nil
}
var _ sources.Source = &Source{}
type Source struct {
Config
baseURL string
client *http.Client
userAgent string
}
func (s *Source) SourceKind() string {
return SourceKind
}
func (s *Source) ToConfig() sources.SourceConfig {
return s.Config
}
func (s *Source) BaseURL() string {
return s.baseURL
}
func (s *Source) Client() *http.Client {
return s.client
}
func (s *Source) UserAgent() string {
return s.userAgent
}
func (s *Source) GetClient(ctx context.Context, accessToken string) (*http.Client, error) {
if s.UseClientOAuth {
if accessToken == "" {
return nil, fmt.Errorf("client-side OAuth is enabled but no access token was provided")
}
token := &oauth2.Token{AccessToken: accessToken}
return oauth2.NewClient(ctx, oauth2.StaticTokenSource(token)), nil
}
return s.client, nil
}
func (s *Source) UseClientAuthorization() bool {
return s.UseClientOAuth
}
func (s *Source) RunQuery(projectID, query string) (any, error) {
url := fmt.Sprintf("%s/v1/projects/%s/location/global/prometheus/api/v1/query", s.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", s.UserAgent())
resp, err := s.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
}
