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memory.go
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memory.go
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package app
import (
"bytes"
"container/list"
"fmt"
"net/http"
"os"
"runtime"
"strconv"
"sync"
"time"
"github.com/gin-gonic/gin"
"github.com/go-logr/logr"
"github.com/prometheus/procfs"
)
const (
_ = 1 << (10 * iota)
Kibi
Mebi
)
//counterfeiter:generate . MemoryGobbler
type MemoryGobbler interface {
UseMemory(numBytes uint64)
Sleep(sleepTime time.Duration)
IsRunning() bool
StopTest()
}
type ListBasedMemoryGobbler struct {
mu sync.RWMutex
used *list.List
isRunning bool
}
var _ MemoryGobbler = &ListBasedMemoryGobbler{}
func MemoryTests(logger logr.Logger, r *gin.RouterGroup, memoryTest MemoryGobbler) *gin.RouterGroup {
r.GET("/:memoryMiB/:minutes", func(c *gin.Context) {
if memoryTest.IsRunning() {
Error(c, http.StatusConflict, "memory test is already running")
return
}
var memoryMiB uint64
var minutes uint64
var err error
memoryMiB, err = strconv.ParseUint(c.Param("memoryMiB"), 10, 64)
if err != nil {
Error(c, http.StatusBadRequest, "invalid memoryMiB: %s", err.Error())
return
}
if minutes, err = strconv.ParseUint(c.Param("minutes"), 10, 64); err != nil {
Error(c, http.StatusBadRequest, "invalid minutes: %s", err.Error())
return
}
duration := time.Duration(minutes) * time.Minute
logger := logger.WithValues("memoryMiB", memoryMiB, "duration", duration)
go func() {
logMemoryUsage(logger, "before memory test")
memoryTest.UseMemory(memoryMiB * Mebi)
logMemoryUsage(logger, "after allocating memory")
memoryTest.Sleep(duration)
memoryTest.StopTest()
}()
c.JSON(http.StatusOK, gin.H{"memoryMiB": memoryMiB, "minutes": minutes})
})
r.GET("/close", func(c *gin.Context) {
if memoryTest.IsRunning() {
logger.Info("stop mem test")
memoryTest.StopTest()
logMemoryUsage(logger, "after freeing memory")
c.JSON(http.StatusOK, gin.H{"status": "close memory test"})
} else {
Error(c, http.StatusBadRequest, "memory test not running")
}
})
return r
}
func logMemoryUsage(logger logr.Logger, action string) {
logger = logger.WithValues("action", action)
memoryUsage, err := getTotalMemoryUsage()
if err == nil {
logger.Info("memory usage", "usage", memoryUsage/Mebi)
} else {
logger.Error(err, "could not determine memory usage")
}
}
func Error(c *gin.Context, status int, descriptionf string, args ...any) {
c.JSON(status, gin.H{"error": gin.H{"description": fmt.Sprintf(descriptionf, args...)}})
}
const chunkSize = 4 * Kibi
func (m *ListBasedMemoryGobbler) UseMemory(numBytes uint64) {
m.mu.Lock()
defer m.mu.Unlock()
m.isRunning = true
m.used = list.New()
used := uint64(0)
for used <= numBytes {
m.used.PushBack(bytes.Repeat([]byte("X"), chunkSize)) // The bytes need to be non-zero to force memory allocation
used += chunkSize
}
}
func (m *ListBasedMemoryGobbler) Sleep(sleepTime time.Duration) {
sleepTill := time.Now().Add(sleepTime)
for m.IsRunning() && time.Now().Before(sleepTill) {
time.Sleep(100 * time.Millisecond)
}
}
func (m *ListBasedMemoryGobbler) IsRunning() bool {
m.mu.RLock()
defer m.mu.RUnlock()
return m.isRunning
}
func (m *ListBasedMemoryGobbler) StopTest() {
m.mu.Lock()
defer m.mu.Unlock()
m.isRunning = false
m.used.Init()
runtime.GC()
}
func getTotalMemoryUsage() (uint64, error) {
fs, err := procfs.NewFS("/proc")
if err != nil {
return 0, err
}
proc, err := fs.Proc(os.Getpid())
if err != nil {
return 0, err
}
stat, err := proc.NewStatus()
if err != nil {
return 0, err
}
result := stat.VmRSS + stat.VmSwap
return result, nil
}