mirror of https://github.com/knative/caching.git
79 lines
2.9 KiB
Go
79 lines
2.9 KiB
Go
/*
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Copyright 2020 The Knative Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"crypto/tls"
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"fmt"
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"contrib.go.opencensus.io/exporter/ocagent"
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"go.opencensus.io/stats/view"
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"go.uber.org/zap"
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"google.golang.org/grpc/credentials"
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"k8s.io/apimachinery/pkg/api/errors"
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)
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func newOpenCensusExporter(config *metricsConfig, logger *zap.SugaredLogger) (view.Exporter, error) {
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opts := []ocagent.ExporterOption{ocagent.WithServiceName(config.component)}
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if config.collectorAddress != "" {
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opts = append(opts, ocagent.WithAddress(config.collectorAddress))
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}
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if config.requireSecure {
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opts = append(opts, ocagent.WithTLSCredentials(credentialFetcher(config.component, config.secretFetcher, logger)))
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} else {
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opts = append(opts, ocagent.WithInsecure())
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}
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e, err := ocagent.NewExporter(opts...)
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if err != nil {
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logger.Errorw("Failed to create the OpenCensus exporter.", zap.Error(err))
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return nil, err
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}
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logger.Infof("Created OpenCensus exporter with config: %+v.", *config)
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view.RegisterExporter(e)
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return e, nil
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}
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// credentialFetcher attempts to locate a secret containing TLS credentials
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// for communicating with the OpenCensus Agent. To do this, it first looks
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// for a secret named "<component>-opencensus", then for a generic
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// "opencensus" secret.
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func credentialFetcher(component string, lister SecretFetcher, logger *zap.SugaredLogger) credentials.TransportCredentials {
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if lister == nil {
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logger.Errorf("No secret lister provided for component %q; cannot use requireSecure=true", component)
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return nil
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}
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return credentials.NewTLS(&tls.Config{
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GetClientCertificate: func(*tls.CertificateRequestInfo) (*tls.Certificate, error) {
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// We ignore the CertificateRequestInfo for now, and hand back a single fixed certificate.
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// TODO(evankanderson): maybe do something SPIFFE-ier?
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cert, err := certificateFetcher(component+"-opencensus", lister)
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if errors.IsNotFound(err) {
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cert, err = certificateFetcher("opencensus", lister)
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}
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if err != nil {
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return nil, fmt.Errorf("Unable to fetch opencensus secret for %q, cannot use requireSecure=true: %+v", component, err)
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}
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return &cert, err
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},
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})
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}
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func certificateFetcher(secretName string, lister SecretFetcher) (tls.Certificate, error) {
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secret, err := lister(secretName)
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if err != nil {
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return tls.Certificate{}, err
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}
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return tls.X509KeyPair(secret.Data["client-cert.pem"], secret.Data["client-key.pem"])
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}
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