diff options
Diffstat (limited to 'Godeps/_workspace/src/gopkg.in/throttled/throttled.v1/examples/memstats/main.go')
-rw-r--r-- | Godeps/_workspace/src/gopkg.in/throttled/throttled.v1/examples/memstats/main.go | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/gopkg.in/throttled/throttled.v1/examples/memstats/main.go b/Godeps/_workspace/src/gopkg.in/throttled/throttled.v1/examples/memstats/main.go new file mode 100644 index 000000000..50d4cc69b --- /dev/null +++ b/Godeps/_workspace/src/gopkg.in/throttled/throttled.v1/examples/memstats/main.go @@ -0,0 +1,97 @@ +package main + +import ( + "flag" + "fmt" + "io/ioutil" + "log" + "math/rand" + "net/http" + "runtime" + "sync" + "time" + + "gopkg.in/throttled/throttled.v1" +) + +var ( + numgc = flag.Int("gc", 0, "number of GC runs") + mallocs = flag.Int("mallocs", 0, "number of mallocs") + total = flag.Int("total", 0, "total number of bytes allocated") + allocs = flag.Int("allocs", 0, "number of bytes allocated") + refrate = flag.Duration("refresh", 0, "refresh rate of the memory stats") + delayRes = flag.Duration("delay-response", 0, "delay the response by a random duration between 0 and this value") + output = flag.String("output", "v", "type of output, one of `v`erbose, `q`uiet, `ok`-only, `ko`-only") +) + +func main() { + flag.Parse() + + var h http.Handler + var ok, ko int + var mu sync.Mutex + + // Keep the start time to print since-time + start := time.Now() + // Create the thresholds struct + thresh := throttled.MemThresholds(&runtime.MemStats{ + NumGC: uint32(*numgc), + Mallocs: uint64(*mallocs), + TotalAlloc: uint64(*total), + Alloc: uint64(*allocs), + }) + if *output != "q" { + log.Printf("thresholds: NumGC: %d, Mallocs: %d, Alloc: %dKb, Total: %dKb", thresh.NumGC, thresh.Mallocs, thresh.Alloc/1024, thresh.TotalAlloc/1024) + } + // Create the MemStats throttler + t := throttled.MemStats(thresh, *refrate) + // Set its denied handler + t.DeniedHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + if *output == "v" || *output == "ko" { + log.Printf("KO: %s", time.Since(start)) + } + throttled.DefaultDeniedHandler.ServeHTTP(w, r) + mu.Lock() + defer mu.Unlock() + ko++ + }) + + // Throttle the OK handler + rand.Seed(time.Now().Unix()) + h = t.Throttle(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + if *output == "v" || *output == "ok" { + log.Printf("ok: %s", time.Since(start)) + } + if *delayRes > 0 { + wait := time.Duration(rand.Intn(int(*delayRes))) + time.Sleep(wait) + } + // Read the whole file in memory, to actually use 64Kb (instead of streaming to w) + b, err := ioutil.ReadFile("test-file") + if err != nil { + throttled.Error(w, r, err) + return + } + _, err = w.Write(b) + if err != nil { + throttled.Error(w, r, err) + } + mu.Lock() + defer mu.Unlock() + ok++ + })) + + // Print stats once in a while + go func() { + var mem runtime.MemStats + for _ = range time.Tick(10 * time.Second) { + mu.Lock() + runtime.ReadMemStats(&mem) + log.Printf("ok: %d, ko: %d", ok, ko) + log.Printf("TotalAllocs: %d Kb, Allocs: %d Kb, Mallocs: %d, NumGC: %d", mem.TotalAlloc/1024, mem.Alloc/1024, mem.Mallocs, mem.NumGC) + mu.Unlock() + } + }() + fmt.Println("server listening on port 9000") + http.ListenAndServe(":9000", h) +} |