mirror of https://github.com/knative/caching.git
104 lines
3.5 KiB
Go
104 lines
3.5 KiB
Go
/*
|
|
Copyright 2020 The Knative Authors
|
|
|
|
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 metrics
|
|
|
|
import (
|
|
"context"
|
|
"crypto/tls"
|
|
"fmt"
|
|
"path"
|
|
|
|
"contrib.go.opencensus.io/exporter/ocagent"
|
|
"go.opencensus.io/resource"
|
|
"go.opencensus.io/stats/view"
|
|
"go.uber.org/zap"
|
|
"google.golang.org/grpc/credentials"
|
|
corev1 "k8s.io/api/core/v1"
|
|
"k8s.io/apimachinery/pkg/api/errors"
|
|
)
|
|
|
|
func newOpenCensusExporter(config *metricsConfig, logger *zap.SugaredLogger) (view.Exporter, ResourceExporterFactory, error) {
|
|
opts := []ocagent.ExporterOption{ocagent.WithServiceName(config.component)}
|
|
if config.collectorAddress != "" {
|
|
opts = append(opts, ocagent.WithAddress(config.collectorAddress))
|
|
}
|
|
metrixPrefix := path.Join(config.domain, config.component)
|
|
if metrixPrefix != "" {
|
|
opts = append(opts, ocagent.WithMetricNamePrefix(metrixPrefix))
|
|
}
|
|
if config.requireSecure {
|
|
opts = append(opts, ocagent.WithTLSCredentials(getCredentials(config.component, config.secret, logger)))
|
|
} else {
|
|
opts = append(opts, ocagent.WithInsecure())
|
|
}
|
|
e, err := ocagent.NewExporter(opts...)
|
|
if err != nil {
|
|
logger.Errorw("Failed to create the OpenCensus exporter.", zap.Error(err))
|
|
return nil, nil, err
|
|
}
|
|
logger.Infow("Created OpenCensus exporter with config:", zap.Any("config", *config))
|
|
view.RegisterExporter(e)
|
|
return e, getFactory(opts), nil
|
|
}
|
|
|
|
func getFactory(stored []ocagent.ExporterOption) ResourceExporterFactory {
|
|
return func(r *resource.Resource) (view.Exporter, error) {
|
|
opts := append(stored, ocagent.WithResourceDetector(
|
|
func(context.Context) (*resource.Resource, error) {
|
|
return r, nil
|
|
}))
|
|
return ocagent.NewExporter(opts...)
|
|
}
|
|
}
|
|
|
|
// getOpenCensusSecret attempts to locate a secret containing TLS credentials
|
|
// for communicating with the OpenCensus Agent. To do this, it first looks
|
|
// for a secret named "<component>-opencensus", then for a generic
|
|
// "opencensus" secret.
|
|
func getOpenCensusSecret(component string, lister SecretFetcher) (*corev1.Secret, error) {
|
|
if lister == nil {
|
|
return nil, fmt.Errorf("no secret lister provided for component %q; cannot use requireSecure=true", component)
|
|
}
|
|
secret, err := lister(component + "-opencensus")
|
|
if errors.IsNotFound(err) {
|
|
secret, err = lister("opencensus")
|
|
}
|
|
if err != nil {
|
|
return nil, fmt.Errorf("unable to fetch opencensus secret for %q, cannot use requireSecure=true: %+v", component, err)
|
|
}
|
|
|
|
return secret, nil
|
|
}
|
|
|
|
// getCredentials attempts to create a certificate containing TLS credentials
|
|
// for communicating with the OpenCensus Agent.
|
|
func getCredentials(component string, secret *corev1.Secret, logger *zap.SugaredLogger) credentials.TransportCredentials {
|
|
if secret == nil {
|
|
logger.Errorf("No secret provided for component %q; cannot use requireSecure=true", component)
|
|
return nil
|
|
}
|
|
return credentials.NewTLS(&tls.Config{
|
|
GetClientCertificate: func(*tls.CertificateRequestInfo) (*tls.Certificate, error) {
|
|
cert, err := tls.X509KeyPair(secret.Data["client-cert.pem"], secret.Data["client-key.pem"])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &cert, nil
|
|
},
|
|
})
|
|
}
|