From bffe99aeadae09abd02f2bd3184925af6b680535 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Mon, 12 Feb 2018 20:10:44 +0100
Subject: Don't use modules

Feel free to revert this if you have a strong feeling about it. But so
far as I can see, it adds a lot of complexity for basically no upsides.
---
 internal/ratelimiter/ratelimiter.go | 149 ------------------------------------
 1 file changed, 149 deletions(-)
 delete mode 100644 internal/ratelimiter/ratelimiter.go

(limited to 'internal/ratelimiter/ratelimiter.go')

diff --git a/internal/ratelimiter/ratelimiter.go b/internal/ratelimiter/ratelimiter.go
deleted file mode 100644
index 006900a..0000000
--- a/internal/ratelimiter/ratelimiter.go
+++ /dev/null
@@ -1,149 +0,0 @@
-package ratelimiter
-
-/* Copyright (C) 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
-
-/* This file contains a port of the rate-limiter from the linux kernel version */
-
-import (
-	"net"
-	"sync"
-	"time"
-)
-
-const (
-	packetsPerSecond   = 20
-	packetsBurstable   = 5
-	garbageCollectTime = time.Second
-	packetCost         = 1000000000 / packetsPerSecond
-	maxTokens          = packetCost * packetsBurstable
-)
-
-type RatelimiterEntry struct {
-	mutex    sync.Mutex
-	lastTime time.Time
-	tokens   int64
-}
-
-type Ratelimiter struct {
-	mutex     sync.RWMutex
-	stop      chan struct{}
-	tableIPv4 map[[net.IPv4len]byte]*RatelimiterEntry
-	tableIPv6 map[[net.IPv6len]byte]*RatelimiterEntry
-}
-
-func (rate *Ratelimiter) Close() {
-	rate.mutex.Lock()
-	defer rate.mutex.Unlock()
-
-	if rate.stop != nil {
-		close(rate.stop)
-	}
-}
-
-func (rate *Ratelimiter) Init() {
-	rate.mutex.Lock()
-	defer rate.mutex.Unlock()
-
-	// stop any ongoing garbage collection routine
-
-	if rate.stop != nil {
-		close(rate.stop)
-	}
-
-	rate.stop = make(chan struct{})
-	rate.tableIPv4 = make(map[[net.IPv4len]byte]*RatelimiterEntry)
-	rate.tableIPv6 = make(map[[net.IPv6len]byte]*RatelimiterEntry)
-
-	// start garbage collection routine
-
-	go func() {
-		timer := time.NewTimer(time.Second)
-		for {
-			select {
-			case <-rate.stop:
-				return
-			case <-timer.C:
-				func() {
-					rate.mutex.Lock()
-					defer rate.mutex.Unlock()
-
-					for key, entry := range rate.tableIPv4 {
-						entry.mutex.Lock()
-						if time.Now().Sub(entry.lastTime) > garbageCollectTime {
-							delete(rate.tableIPv4, key)
-						}
-						entry.mutex.Unlock()
-					}
-
-					for key, entry := range rate.tableIPv6 {
-						entry.mutex.Lock()
-						if time.Now().Sub(entry.lastTime) > garbageCollectTime {
-							delete(rate.tableIPv6, key)
-						}
-						entry.mutex.Unlock()
-					}
-				}()
-				timer.Reset(time.Second)
-			}
-		}
-	}()
-}
-
-func (rate *Ratelimiter) Allow(ip net.IP) bool {
-	var entry *RatelimiterEntry
-	var KeyIPv4 [net.IPv4len]byte
-	var KeyIPv6 [net.IPv6len]byte
-
-	// lookup entry
-
-	IPv4 := ip.To4()
-	IPv6 := ip.To16()
-
-	rate.mutex.RLock()
-
-	if IPv4 != nil {
-		copy(KeyIPv4[:], IPv4)
-		entry = rate.tableIPv4[KeyIPv4]
-	} else {
-		copy(KeyIPv6[:], IPv6)
-		entry = rate.tableIPv6[KeyIPv6]
-	}
-
-	rate.mutex.RUnlock()
-
-	// make new entry if not found
-
-	if entry == nil {
-		rate.mutex.Lock()
-		entry = new(RatelimiterEntry)
-		entry.tokens = maxTokens - packetCost
-		entry.lastTime = time.Now()
-		if IPv4 != nil {
-			rate.tableIPv4[KeyIPv4] = entry
-		} else {
-			rate.tableIPv6[KeyIPv6] = entry
-		}
-		rate.mutex.Unlock()
-		return true
-	}
-
-	// add tokens to entry
-
-	entry.mutex.Lock()
-	now := time.Now()
-	entry.tokens += now.Sub(entry.lastTime).Nanoseconds()
-	entry.lastTime = now
-	if entry.tokens > maxTokens {
-		entry.tokens = maxTokens
-	}
-
-	// subtract cost of packet
-
-	if entry.tokens > packetCost {
-		entry.tokens -= packetCost
-		entry.mutex.Unlock()
-		return true
-	}
-	entry.mutex.Unlock()
-	return false
-}
-- 
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