mirror of https://github.com/knative/pkg.git
108 lines
3.7 KiB
Go
108 lines
3.7 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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"context"
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"crypto/tls"
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"fmt"
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"path"
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"contrib.go.opencensus.io/exporter/ocagent"
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"go.opencensus.io/resource"
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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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corev1 "k8s.io/api/core/v1"
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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, ResourceExporterFactory, 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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metrixPrefix := path.Join(config.domain, config.component)
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if metrixPrefix != "" {
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opts = append(opts, ocagent.WithMetricNamePrefix(metrixPrefix))
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}
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if config.requireSecure {
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opts = append(opts, ocagent.WithTLSCredentials(getCredentials(config.component, config.secret, 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, nil, err
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}
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logger.Infow("Created OpenCensus exporter with config:", zap.Any("config", *config))
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view.RegisterExporter(e)
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return e, getFactory(e, opts), nil
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}
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func getFactory(defaultExporter view.Exporter, stored []ocagent.ExporterOption) ResourceExporterFactory {
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return func(r *resource.Resource) (view.Exporter, error) {
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if r == nil || (r.Type == "" && len(r.Labels) == 0) {
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// Don't create duplicate exporters for the default exporter.
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return defaultExporter, nil
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}
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opts := append(stored, ocagent.WithResourceDetector(
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func(context.Context) (*resource.Resource, error) {
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return r, nil
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}))
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return ocagent.NewExporter(opts...)
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}
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}
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// getOpenCensusSecret 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 getOpenCensusSecret(component string, lister SecretFetcher) (*corev1.Secret, error) {
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if lister == nil {
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return nil, fmt.Errorf("no secret lister provided for component %q; cannot use requireSecure=true", component)
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}
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secret, err := lister(component + "-opencensus")
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if errors.IsNotFound(err) {
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secret, err = lister("opencensus")
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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 secret, nil
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}
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// getCredentials attempts to create a certificate containing TLS credentials
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// for communicating with the OpenCensus Agent.
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func getCredentials(component string, secret *corev1.Secret, logger *zap.SugaredLogger) credentials.TransportCredentials {
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if secret == nil {
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logger.Errorf("No secret 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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cert, err := tls.X509KeyPair(secret.Data["client-cert.pem"], secret.Data["client-key.pem"])
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if err != nil {
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return nil, err
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}
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return &cert, nil
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},
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})
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}
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