github.com/galamsiva2020/kubernetes-heapster-monitoring@v0.0.0-20210823134957-3c1baa7c1e70/events/sinks/gcl/gcl.go (about)

     1  // Copyright 2015 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package gcl
    16  
    17  import (
    18  	"encoding/json"
    19  	"fmt"
    20  	"net/url"
    21  	"time"
    22  
    23  	gce_util "k8s.io/heapster/common/gce"
    24  	"k8s.io/heapster/events/core"
    25  
    26  	"github.com/golang/glog"
    27  	"golang.org/x/oauth2"
    28  	"golang.org/x/oauth2/google"
    29  	gcl "google.golang.org/api/logging/v2"
    30  )
    31  
    32  const (
    33  	monitoredResourceType = "global"
    34  	logName               = "kubernetes.io/events"
    35  	loggingSeverity       = "NOTICE"
    36  )
    37  
    38  type gclSink struct {
    39  	project    string
    40  	gclService *gcl.Service
    41  }
    42  
    43  func (sink *gclSink) ExportEvents(eventBatch *core.EventBatch) {
    44  	if len(eventBatch.Events) == 0 {
    45  		glog.V(4).Info("Not events to export")
    46  		return
    47  	}
    48  	glog.V(4).Info("Exporting events")
    49  	entries := make([]*gcl.LogEntry, len(eventBatch.Events))
    50  	for i, event := range eventBatch.Events {
    51  		evtJson, err := json.Marshal(event)
    52  		if err != nil {
    53  			glog.Errorf("Skipping exporting event due to error while marshaling event %v as JSON: %v", event, err)
    54  			continue
    55  		}
    56  		entries[i] = &gcl.LogEntry{
    57  			LogName:     fmt.Sprintf("projects/%s/logs/%s", sink.project, url.QueryEscape(logName)),
    58  			Timestamp:   event.LastTimestamp.Time.UTC().Format(time.RFC3339),
    59  			Severity:    loggingSeverity,
    60  			Resource:    &gcl.MonitoredResource{Type: monitoredResourceType},
    61  			InsertId:    string(event.UID),
    62  			JsonPayload: evtJson,
    63  		}
    64  	}
    65  	req := &gcl.WriteLogEntriesRequest{Entries: entries}
    66  	if _, err := sink.gclService.Entries.Write(req).Do(); err != nil {
    67  		glog.Errorf("Error while exporting events to GCL: %v", err)
    68  	} else {
    69  		glog.V(4).Infof("Successfully exported %d events", len(entries))
    70  	}
    71  }
    72  
    73  func (sink *gclSink) Name() string {
    74  	return "GCL Sink"
    75  }
    76  
    77  func (sink *gclSink) Stop() {
    78  	// nothing needs to be done.
    79  }
    80  
    81  func CreateGCLSink(uri *url.URL) (core.EventSink, error) {
    82  	client, err := google.DefaultClient(oauth2.NoContext, gcl.LoggingWriteScope)
    83  	if err != nil {
    84  		return nil, fmt.Errorf("error creating oauth2 client: %v", err)
    85  	}
    86  
    87  	// Create Google Cloud Logging service.
    88  	gclService, err := gcl.New(client)
    89  	if err != nil {
    90  		return nil, fmt.Errorf("error creating GCL service: %v", err)
    91  	}
    92  
    93  	// Detect project ID
    94  	projectId, err := gce_util.GetProjectId()
    95  	if err != nil {
    96  		return nil, fmt.Errorf("error getting GCP project ID: %v", err)
    97  	}
    98  
    99  	sink := &gclSink{project: projectId, gclService: gclService}
   100  	glog.Info("created GCL sink")
   101  	return sink, nil
   102  }