Quotas are more accurate, occur on Read()

pkg/api/api_router.go

@@ -25,6 +25,7 @@ import (
 	"github.com/minio-io/minio/pkg/api/quota"
 	"github.com/minio-io/minio/pkg/iodine"
 	"github.com/minio-io/minio/pkg/storage/drivers"
+	"time"
 )
 
 // private use
@@ -91,6 +92,7 @@ func HTTPHandler(domain string, driver drivers.Driver) http.Handler {
 	}
 
 	h := validateHandler(conf, ignoreResourcesHandler(mux))
-	// quota handler is always last
+	h = quota.BandwidthCap(h, 250*1024*1024, time.Duration(30*time.Minute))
-	return quota.BandwidthCap(h, int64(100*1024*1024))
+	h = quota.RequestLimit(h, 100, time.Duration(30*time.Minute))
+	return h
 }

pkg/api/quota/bandwidth_cap.go

@@ -0,0 +1,83 @@
+/*
+ * 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 (
+	"errors"
+	"io"
+	"net"
+	"net/http"
+	"time"
+)
+
+// bandwidthQuotaHandler
+type bandwidthQuotaHandler struct {
+	handler http.Handler
+	quotas  *quotaMap
+}
+
+// ServeHTTP is an http.Handler ServeHTTP method
+func (h *bandwidthQuotaHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	host, _, _ := net.SplitHostPort(req.RemoteAddr)
+	longIP := longIP{net.ParseIP(host)}.IptoUint32()
+	req.Body = quotaReader{
+		ReadCloser: req.Body,
+		quotas:     h.quotas,
+		ip:         longIP,
+	}
+	h.handler.ServeHTTP(w, req)
+}
+
+// BandwidthCap sets a quote based upon bandwidth used
+func BandwidthCap(h http.Handler, limit int64, duration time.Duration) http.Handler {
+	return &bandwidthQuotaHandler{
+		handler: h,
+		quotas: &quotaMap{
+			data:        make(map[int64]map[uint32]int64),
+			limit:       int64(limit),
+			duration:    duration,
+			segmentSize: segmentSize(duration),
+		},
+	}
+}
+
+type quotaReader struct {
+	io.ReadCloser
+	quotas *quotaMap
+	ip     uint32
+}
+
+func (q quotaReader) Read(b []byte) (int, error) {
+	if q.quotas.IsQuotaMet(q.ip) {
+		return 0, errors.New("Quota Met")
+	}
+	n, err := q.ReadCloser.Read(b)
+	q.quotas.Add(q.ip, int64(n))
+	return n, err
+}
+
+func (q quotaReader) Close() error {
+	return q.ReadCloser.Close()
+}
+
+func segmentSize(duration time.Duration) time.Duration {
+	var segmentSize time.Duration
+	for i := int64(1); i < duration.Nanoseconds(); i = i * 10 {
+		segmentSize = time.Duration(i)
+	}
+	return segmentSize
+}

pkg/api/quota/quota_handler.go

@@ -19,7 +19,6 @@ package quota
 import (
 	"encoding/binary"
 	"net"
-	"net/http"
 	"sync"
 	"time"
 )
@@ -27,38 +26,51 @@ import (
 // map[minute][address] = current quota
 type quotaMap struct {
 	sync.RWMutex
-	data     map[int64]map[uint32]uint64
+	data        map[int64]map[uint32]int64
-	limit    uint64
+	limit       int64
-	duration int64
+	duration    time.Duration
+	segmentSize time.Duration
 }
 
-func (q *quotaMap) Add(ip uint32, size uint64) bool {
+func (q *quotaMap) Add(ip uint32, size int64) {
 	q.Lock()
 	defer q.Unlock()
-	currentMinute := time.Now().Unix() / q.duration
+	q.clean()
-	expiredQuotas := (time.Now().Unix() / q.duration) - 5
+	currentMinute := time.Now().UnixNano() / q.segmentSize.Nanoseconds()
-	for time := range q.data {
-		if time < expiredQuotas {
-			delete(q.data, time)
-		}
-	}
 	if _, ok := q.data[currentMinute]; !ok {
-		q.data[currentMinute] = make(map[uint32]uint64)
+		q.data[currentMinute] = make(map[uint32]int64)
 	}
 	currentData, _ := q.data[currentMinute][ip]
 	proposedDataSize := currentData + size
-	if proposedDataSize > q.limit {
-		return false
-	}
 	q.data[currentMinute][ip] = proposedDataSize
-	return true
 }
 
-// HttpQuotaHandler
+func (q *quotaMap) IsQuotaMet(ip uint32) bool {
-type httpQuotaHandler struct {
+	q.clean()
-	handler http.Handler
+	currentMinute := time.Now().UnixNano() / q.segmentSize.Nanoseconds()
-	quotas  *quotaMap
+	if _, ok := q.data[currentMinute]; !ok {
-	adder   func(uint64) uint64
+		q.data[currentMinute] = make(map[uint32]int64)
+	}
+	var total int64
+	for _, segment := range q.data {
+		if used, ok := segment[ip]; ok {
+			total += used
+		}
+	}
+	if total >= q.limit {
+		return true
+	}
+	return false
+}
+
+func (q *quotaMap) clean() {
+	currentMinute := time.Now().UnixNano() / q.segmentSize.Nanoseconds()
+	expiredQuotas := currentMinute - q.duration.Nanoseconds()
+	for time := range q.data {
+		if time < expiredQuotas {
+			delete(q.data, time)
+		}
+	}
 }
 
 type longIP struct {
@@ -73,38 +85,3 @@ func (p longIP) IptoUint32() (result uint32) {
 	}
 	return binary.BigEndian.Uint32(ip)
 }
-
-// ServeHTTP is an http.Handler ServeHTTP method
-func (h *httpQuotaHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
-	host, _, _ := net.SplitHostPort(req.RemoteAddr)
-	longIP := longIP{net.ParseIP(host)}.IptoUint32()
-	if h.quotas.Add(longIP, h.adder(uint64(req.ContentLength))) {
-		h.handler.ServeHTTP(w, req)
-	}
-}
-
-// BandwidthCap sets a quote based upon bandwidth used
-func BandwidthCap(h http.Handler, limit int64) http.Handler {
-	return &httpQuotaHandler{
-		handler: h,
-		quotas: &quotaMap{
-			data:     make(map[int64]map[uint32]uint64),
-			limit:    uint64(limit),
-			duration: int64(60),
-		},
-		adder: func(count uint64) uint64 { return count },
-	}
-}
-
-// RequestLimit sets a quota based upon request count
-func RequestLimit(h http.Handler, limit int64) http.Handler {
-	return &httpQuotaHandler{
-		handler: h,
-		quotas: &quotaMap{
-			data:     make(map[int64]map[uint32]uint64),
-			limit:    uint64(limit),
-			duration: int64(60),
-		},
-		adder: func(count uint64) uint64 { return 1 },
-	}
-}

pkg/api/quota/request_limit.go

@@ -0,0 +1,53 @@
+/*
+ * 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"
+	"time"
+)
+
+// requestLimitHandler
+type requestLimitHandler struct {
+	handler http.Handler
+	quotas  *quotaMap
+}
+
+// ServeHTTP is an http.Handler ServeHTTP method
+func (h *requestLimitHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	host, _, _ := net.SplitHostPort(req.RemoteAddr)
+	longIP := longIP{net.ParseIP(host)}.IptoUint32()
+	if h.quotas.IsQuotaMet(longIP) {
+		return
+	}
+	h.quotas.Add(longIP, 1)
+	h.handler.ServeHTTP(w, req)
+}
+
+// RequestLimit sets a quote based upon number of requests allowed over a time period
+func RequestLimit(h http.Handler, limit int64, duration time.Duration) http.Handler {
+	return &requestLimitHandler{
+		handler: h,
+		quotas: &quotaMap{
+			data:        make(map[int64]map[uint32]int64),
+			limit:       int64(limit),
+			duration:    duration,
+			segmentSize: segmentSize(duration),
+		},
+	}
+}