Adding connection limits

pkg/api/api_router.go

@@ -92,8 +92,10 @@ func HTTPHandler(domain string, driver drivers.Driver) http.Handler {
 	}
 
 	h := validateHandler(conf, ignoreResourcesHandler(mux))
-	h = quota.BandwidthCap(h, 256*1024*1024, time.Duration(30*time.Minute))
+	h = quota.BandwidthCap(h, 1*1024*1024*1024, time.Duration(30*time.Minute))
 	h = quota.BandwidthCap(h, 1024*1024*1024, time.Duration(24*time.Hour))
 	h = quota.RequestLimit(h, 100, time.Duration(30*time.Minute))
+	h = quota.RequestLimit(h, 1000, time.Duration(24*time.Hour))
+	h = quota.ConnectionLimit(h, 5)
 	return h
 }

pkg/api/quota/conn_limit.go

@@ -0,0 +1,74 @@
+/*
+ * Minimalist Object Storage, (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package quota
+
+import (
+	"net"
+	"net/http"
+	"sync"
+)
+
+// requestLimitHandler
+type connLimit struct {
+	sync.RWMutex
+	handler     http.Handler
+	connections map[uint32]int
+	limit       int
+}
+
+func (c *connLimit) TestAndAdd(ip uint32) bool {
+	c.Lock()
+	defer c.Unlock()
+	count, _ := c.connections[ip]
+	if count >= c.limit {
+		return false
+	}
+	count = count + 1
+	c.connections[ip] = count
+	return true
+}
+
+func (c *connLimit) Remove(ip uint32) {
+	c.Lock()
+	defer c.Unlock()
+	count, _ := c.connections[ip]
+	count = count - 1
+	if count <= 0 {
+		delete(c.connections, ip)
+		return
+	}
+	c.connections[ip] = count
+}
+
+// ServeHTTP is an http.Handler ServeHTTP method
+func (c *connLimit) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	host, _, _ := net.SplitHostPort(req.RemoteAddr)
+	longIP := longIP{net.ParseIP(host)}.IptoUint32()
+	if c.TestAndAdd(longIP) {
+		defer c.Remove(longIP)
+		c.handler.ServeHTTP(w, req)
+	}
+}
+
+// ConnectionLimit limits the number of concurrent connections
+func ConnectionLimit(h http.Handler, limit int) http.Handler {
+	return &connLimit{
+		handler:     h,
+		connections: make(map[uint32]int),
+		limit:       limit,
+	}
+}