mirror of https://github.com/knative/pkg.git
105 lines
2.5 KiB
Go
105 lines
2.5 KiB
Go
/*
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Copyright 2019 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 logstream
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import (
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"context"
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"fmt"
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"os"
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"strings"
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"sync"
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"k8s.io/client-go/kubernetes"
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"knative.dev/pkg/system"
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"knative.dev/pkg/test"
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"knative.dev/pkg/test/helpers"
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logstreamv2 "knative.dev/pkg/test/logstream/v2"
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)
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type (
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// Canceler is the type of function returned when a logstream is started to be
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// deferred so that the logstream can be stopped when the test is complete.
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Canceler = logstreamv2.Canceler
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)
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type ti interface {
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Name() string
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Error(args ...interface{})
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Log(args ...interface{})
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Logf(fmt string, args ...interface{})
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}
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// Start begins streaming the logs from system components with a `key:` matching
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// `test.ObjectNameForTest(t)` to `t.Log`. It returns a Canceler, which must
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// be called before the test completes.
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func Start(t ti) Canceler {
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// Do this lazily to make import ordering less important.
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once.Do(func() {
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if ns := os.Getenv(system.NamespaceEnvKey); ns != "" {
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var err error
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// handle case when ns contains a csv list
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namespaces := strings.Split(ns, ",")
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if sysStream, err = initStream(namespaces); err != nil {
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t.Error("Error initializing logstream", "error", err)
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}
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} else {
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// Otherwise, set up a null stream.
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sysStream = &null{}
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}
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})
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return sysStream.Start(t)
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}
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func initStream(namespaces []string) (streamer, error) {
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config, err := test.Flags.GetRESTConfig()
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if err != nil {
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return &null{}, fmt.Errorf("error loading client config: %w", err)
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}
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kc, err := kubernetes.NewForConfig(config)
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if err != nil {
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return &null{}, fmt.Errorf("error creating kubernetes client: %w", err)
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}
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return &shim{logstreamv2.FromNamespaces(context.Background(), kc, namespaces)}, nil
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}
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type streamer interface {
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Start(t ti) Canceler
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}
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var (
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sysStream streamer
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once sync.Once
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)
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type shim struct {
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logstreamv2.Source
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}
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func (s *shim) Start(t ti) Canceler {
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name := helpers.ObjectPrefixForTest(t)
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canceler, err := s.StartStream(name, t.Logf)
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if err != nil {
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t.Error("Failed to start logstream", "error", err)
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}
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return canceler
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}
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