diff options
Diffstat (limited to 'Godeps/_workspace/src/gopkg.in/throttled/throttled.v1/examples/custom/main.go')
-rw-r--r-- | Godeps/_workspace/src/gopkg.in/throttled/throttled.v1/examples/custom/main.go | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/gopkg.in/throttled/throttled.v1/examples/custom/main.go b/Godeps/_workspace/src/gopkg.in/throttled/throttled.v1/examples/custom/main.go new file mode 100644 index 000000000..b3fe993e8 --- /dev/null +++ b/Godeps/_workspace/src/gopkg.in/throttled/throttled.v1/examples/custom/main.go @@ -0,0 +1,90 @@ +package main + +import ( + "flag" + "fmt" + "log" + "math/rand" + "net/http" + "sync" + "time" + + "gopkg.in/throttled/throttled.v1" +) + +var ( + 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") +) + +// Custom limiter: allow requests to the /a path on even seconds only, and +// allow access to the /b path on odd seconds only. +// +// Yes this is absurd. A more realistic case could be to allow requests to some +// contest page only during a limited time window. +type customLimiter struct { +} + +func (c *customLimiter) Start() { + // No-op +} + +func (c *customLimiter) Limit(w http.ResponseWriter, r *http.Request) (<-chan bool, error) { + s := time.Now().Second() + ch := make(chan bool, 1) + ok := (r.URL.Path == "/a" && s%2 == 0) || (r.URL.Path == "/b" && s%2 != 0) + ch <- ok + if *output == "v" { + log.Printf("Custom Limiter: Path=%s, Second=%d; ok? %v", r.URL.Path, s, ok) + } + return ch, nil +} + +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 custom throttler using our custom limiter + t := throttled.Custom(&customLimiter{}) + // 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) + } + w.WriteHeader(200) + mu.Lock() + defer mu.Unlock() + ok++ + })) + + // Print stats once in a while + go func() { + for _ = range time.Tick(10 * time.Second) { + mu.Lock() + log.Printf("ok: %d, ko: %d", ok, ko) + mu.Unlock() + } + }() + fmt.Println("server listening on port 9000") + http.ListenAndServe(":9000", h) +} |