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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "net" | ||
| "net/http" | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| const maxRequestsPerSecond = 10 | ||
|
|
||
| // ratelimiter keeps the API request stats and determines whether | ||
| // to allow the request or not. | ||
| type ratelimiter struct { | ||
| requests map[string]int | ||
| mu sync.Mutex | ||
| } | ||
|
|
||
| func newRatelimiter(stopChan chan struct{}) *ratelimiter { | ||
| rl := &ratelimiter{ | ||
| requests: make(map[string]int), | ||
| } | ||
|
|
||
| ticker := time.Tick(time.Second) | ||
| go func() { | ||
| for range ticker { | ||
| select { | ||
| case <-stopChan: | ||
| return | ||
| default: | ||
| } | ||
| rl.mu.Lock() | ||
| rl.requests = make(map[string]int) | ||
| rl.mu.Unlock() | ||
| } | ||
| }() | ||
|
|
||
| return rl | ||
| } | ||
|
|
||
| // limitExceeded returns true if there are too many requests from the given host. | ||
| func (rl *ratelimiter) limitExceeded(addr string) bool { | ||
| rl.mu.Lock() | ||
| defer rl.mu.Unlock() | ||
|
|
||
| rl.requests[addr]++ | ||
| return rl.requests[addr] > maxRequestsPerSecond | ||
| } | ||
|
|
||
| // getRemoteHost returns the address of the remote host. | ||
| func getRemoteHost(r *http.Request) (host string) { | ||
| host, _, _ = net.SplitHostPort(r.RemoteAddr) | ||
| if host == "127.0.0.1" || host == "localhost" { | ||
| xff := r.Header.Values("X-Forwarded-For") | ||
| if len(xff) > 0 { | ||
| host = xff[0] | ||
| } | ||
| } | ||
| return | ||
| } |