/
loadsim.go
92 lines (72 loc) · 2.07 KB
/
loadsim.go
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package support_archive
import (
"context"
"fmt"
"io"
"github.com/Dynatrace/dynatrace-operator/pkg/logd"
"golang.org/x/exp/rand"
clientgocorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
)
const loadSimCollectorName = "loadSimCollector"
type loadSimCollector struct {
context context.Context
pods clientgocorev1.PodInterface
collectorCommon
fileSize int
fileCount int
}
func newLoadSimCollector(ctx context.Context, log logd.Logger, supportArchive archiver, fileSize int, fileCount int, pods clientgocorev1.PodInterface) collector { //nolint:revive // argument-limit doesn't apply to constructors
return loadSimCollector{
collectorCommon: collectorCommon{
log: log,
supportArchive: supportArchive,
},
context: ctx,
fileSize: fileSize,
fileCount: fileCount,
pods: pods,
}
}
func (collector loadSimCollector) Do() error {
if collector.fileCount <= 0 {
return nil
}
logInfof(collector.log, "Starting load simulation (%d files, %d MB/file)", collector.fileCount, collector.fileSize)
collector.createSimulatedLogFiles()
return nil
}
func (collector loadSimCollector) Name() string {
return loadSimCollectorName
}
func (collector loadSimCollector) createSimulatedLogFiles() {
for i := 0; i < collector.fileCount; i++ {
fileName := buildLoadsimFileName(i)
lg := loadGenerator{
fileSize: collector.fileSize,
}
err := collector.supportArchive.addFile(fileName, &lg)
if err != nil {
logErrorf(collector.log, err, "error writing simulated load to zip")
return
}
logInfof(collector.log, "Successfully collected logs %s", fileName)
}
}
func buildLoadsimFileName(i int) string {
return fmt.Sprintf("%s/loadsim/%s-%d.log", LogsDirectoryName, "loadsim", i)
}
type loadGenerator struct {
fileSize int
}
var letters = []byte("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 ")
func (lg *loadGenerator) Read(p []byte) (n int, err error) {
if lg.fileSize > 0 {
i := 0
for ; i < len(p) && lg.fileSize > 0; i++ {
p[i] = letters[rand.Intn(len(letters))]
lg.fileSize--
}
return i, nil
}
return 0, io.EOF
}