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k8s.go
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k8s.go
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package cmd
import (
"encoding/json"
"fmt"
"time"
"cloud.google.com/go/logging"
"cloud.google.com/go/logging/apiv2/loggingpb"
"github.com/owenrumney/gtail/internal/pkg/logfilter"
"github.com/owenrumney/gtail/internal/pkg/logs"
"github.com/owenrumney/gtail/pkg/logger"
"github.com/owenrumney/gtail/pkg/output"
"github.com/spf13/cobra"
appEngine "google.golang.org/genproto/googleapis/appengine/logging/v1"
"google.golang.org/genproto/googleapis/cloud/audit"
"google.golang.org/protobuf/proto"
)
var k8sCommand = &cobra.Command{
Use: "k8s",
Short: "Tail logs for GKE Cluster",
RunE: func(cmd *cobra.Command, args []string) error {
outputWriter := output.New(outputFormat, severities, defaultK8sLogWriter)
la := logs.New(projectID, severities, outputWriter)
lf := logfilter.New(projectID, logfilter.K8sClusterLogFilterType).
WithServiceName(serviceName).
WithRegion(region)
return la.StreamLogEntries(lf)
},
}
func getK8sCommand() *cobra.Command {
// add the flags
k8sCommand.PersistentFlags().StringVar(&clusterName, "cluster", clusterName, "GKE Cluster you want to tail logs for")
k8sCommand.PersistentFlags().StringSliceVar(&severities, "severity", severities, "The severity of logs to include")
k8sCommand.PersistentFlags().StringVarP(&outputFormat, "output", "o", outputFormat, "The output format either json or a template string")
return k8sCommand
}
func defaultK8sLogWriter(value interface{}) error {
switch t := value.(type) {
case *logging.Entry:
if content, ok := t.Payload.(string); ok {
fmt.Printf("%v\n", content)
}
case *loggingpb.LogEntry:
var content string
switch payload := t.Payload.(type) {
case *loggingpb.LogEntry_TextPayload:
content = payload.TextPayload
case *loggingpb.LogEntry_ProtoPayload:
switch payload.ProtoPayload.TypeUrl {
case "type.googleapis.com/google.cloud.audit.AuditLog":
var auditLog audit.AuditLog
err := proto.Unmarshal(payload.ProtoPayload.Value, &auditLog)
if err != nil {
logger.Error("error unmarshalling audit log: %v", err)
content = fmt.Sprintf("%v", payload.ProtoPayload)
} else {
contentBytes, err := json.MarshalIndent(auditLog, "", " ")
if err != nil {
logger.Error("error marshalling audit log: %v", err)
content = fmt.Sprintf("%v", auditLog)
} else {
content = string(contentBytes)
}
}
case "type.googleapis.com/google.appengine.logging.v1.RequestLog":
var requestLog appEngine.RequestLog
err := proto.Unmarshal(payload.ProtoPayload.Value, &requestLog)
if err != nil {
logger.Error("error unmarshalling audit log: %v", err)
content = fmt.Sprintf("%v", payload.ProtoPayload)
} else {
content = fmt.Sprintf("%v", requestLog)
}
default:
content = fmt.Sprintf("%v", payload.ProtoPayload)
}
case *loggingpb.LogEntry_JsonPayload:
c, err := json.MarshalIndent(payload.JsonPayload, "", " ")
if err != nil {
logger.Error("error marshalling json payload: %v", err)
content = fmt.Sprintf("%v", payload.JsonPayload)
} else {
content = string(c)
}
}
fmt.Printf("%s: %v\n", t.Timestamp.AsTime().Format(time.RFC3339), content)
default:
fmt.Printf("%v\n", value)
}
return nil
}