Merge pull request #183 from neilalexander/getswitchqueues

Add getSwitchQueues

src/yggdrasil/admin.go

@@ -90,6 +90,10 @@ func (a *admin) init(c *Core, listenaddr string) {
 		}
 		return admin_info{"switchpeers": switchpeers}, nil
 	})
+	a.addHandler("getSwitchQueues", []string{}, func(in admin_info) (admin_info, error) {
+		queues := a.getData_getSwitchQueues()
+		return admin_info{"switchqueues": queues.asMap()}, nil
+	})
 	a.addHandler("getDHT", []string{}, func(in admin_info) (admin_info, error) {
 		sort := "ip"
 		dht := make(admin_info)
@@ -518,6 +522,35 @@ func (a *admin) getData_getSwitchPeers() []admin_nodeInfo {
 	return peerInfos
 }
 
+// getData_getSwitchQueues returns info from Core.switchTable for an queue data.
+func (a *admin) getData_getSwitchQueues() admin_nodeInfo {
+	var peerInfos admin_nodeInfo
+	switchTable := a.core.switchTable
+	getSwitchQueues := func() {
+		queues := make([]map[string]interface{}, 0)
+		for k, v := range switchTable.queues.bufs {
+			nexthop := switchTable.bestPortForCoords([]byte(k))
+			queue := map[string]interface{}{
+				"queue_id":      k,
+				"queue_size":    v.size,
+				"queue_packets": len(v.packets),
+				"queue_port":    nexthop,
+			}
+			queues = append(queues, queue)
+		}
+		peerInfos = admin_nodeInfo{
+			{"queues", queues},
+			{"queues_count", len(switchTable.queues.bufs)},
+			{"queues_size", switchTable.queues.size},
+			{"highest_queues_count", switchTable.queues.maxbufs},
+			{"highest_queues_size", switchTable.queues.maxsize},
+			{"maximum_queues_size", switch_buffer_maxSize},
+		}
+	}
+	a.core.switchTable.doAdmin(getSwitchQueues)
+	return peerInfos
+}
+
 // getData_getDHT returns info from Core.dht for an admin response.
 func (a *admin) getData_getDHT() []admin_nodeInfo {
 	var infos []admin_nodeInfo

src/yggdrasil/switch.go

@@ -161,11 +161,13 @@ type switchTable struct {
 	parent   switchPort          // Port of whatever peer is our parent, or self if we're root
 	drop     map[sigPubKey]int64 // Tstamp associated with a dropped root
 	mutex    sync.RWMutex        // Lock for reads/writes of switchData
-	data     switchData
+	data     switchData          //
 	updater  atomic.Value        // *sync.Once
 	table    atomic.Value        // lookupTable
 	packetIn chan []byte         // Incoming packets for the worker to handle
 	idleIn   chan switchPort     // Incoming idle notifications from peer links
+	admin    chan func()         // Pass a lambda for the admin socket to query stuff
+	queues   switch_buffers      // Queues - not atomic so ONLY use through admin chan
 }
 
 // Initializes the switchTable struct.
@@ -181,6 +183,7 @@ func (t *switchTable) init(core *Core, key sigPubKey) {
 	t.drop = make(map[sigPubKey]int64)
 	t.packetIn = make(chan []byte, 1024)
 	t.idleIn = make(chan switchPort, 1024)
+	t.admin = make(chan func())
 }
 
 // Safely gets a copy of this node's locator.
@@ -538,6 +541,22 @@ func switch_getPacketStreamID(packet []byte) string {
 	return string(switch_getPacketCoords(packet))
 }
 
+// Find the best port for a given set of coords
+func (t *switchTable) bestPortForCoords(coords []byte) switchPort {
+	table := t.getTable()
+	var best switchPort
+	bestDist := table.self.dist(coords)
+	for to, elem := range table.elems {
+		dist := elem.locator.dist(coords)
+		if !(dist < bestDist) {
+			continue
+		}
+		best = to
+		bestDist = dist
+	}
+	return best
+}
+
 // Handle an incoming packet
 // Either send it to ourself, or to the first idle peer that's free
 // Returns true if the packet has been handled somehow, false if it should be queued
@@ -582,6 +601,8 @@ type switch_packetInfo struct {
 	time  time.Time // Timestamp of when the packet arrived
 }
 
+const switch_buffer_maxSize = 4 * 1048576 // Maximum 4 MB
+
 // Used to keep track of buffered packets
 type switch_buffer struct {
 	packets []switch_packetInfo // Currently buffered packets, which may be dropped if it grows too large
@@ -591,6 +612,8 @@ type switch_buffer struct {
 type switch_buffers struct {
 	bufs    map[string]switch_buffer // Buffers indexed by StreamID
 	size    uint64                   // Total size of all buffers, in bytes
+	maxbufs int
+	maxsize uint64
 }
 
 func (b *switch_buffers) cleanup(t *switchTable) {
@@ -606,8 +629,8 @@ func (b *switch_buffers) cleanup(t *switchTable) {
 			delete(b.bufs, streamID)
 		}
 	}
-	const maxSize = 4 * 1048576 // Maximum 4 MB
+
-	for b.size > maxSize {
+	for b.size > switch_buffer_maxSize {
 		// Drop a random queue
 		target := rand.Uint64() % b.size
 		var size uint64 // running total
@@ -635,16 +658,16 @@ func (b *switch_buffers) cleanup(t *switchTable) {
 // Handles incoming idle notifications
 // Loops over packets and sends the newest one that's OK for this peer to send
 // Returns true if the peer is no longer idle, false if it should be added to the idle list
-func (t *switchTable) handleIdle(port switchPort, bufs *switch_buffers) bool {
+func (t *switchTable) handleIdle(port switchPort) bool {
 	to := t.core.peers.getPorts()[port]
 	if to == nil {
 		return true
 	}
 	var best string
 	var bestPriority float64
-	bufs.cleanup(t)
+	t.queues.cleanup(t)
 	now := time.Now()
-	for streamID, buf := range bufs.bufs {
+	for streamID, buf := range t.queues.bufs {
 		// Filter over the streams that this node is closer to
 		// Keep the one with the smallest queue
 		packet := buf.packets[0]
@@ -656,17 +679,17 @@ func (t *switchTable) handleIdle(port switchPort, bufs *switch_buffers) bool {
 		}
 	}
 	if bestPriority != 0 {
-		buf := bufs.bufs[best]
+		buf := t.queues.bufs[best]
 		var packet switch_packetInfo
 		// TODO decide if this should be LIFO or FIFO
 		packet, buf.packets = buf.packets[0], buf.packets[1:]
 		buf.size -= uint64(len(packet.bytes))
-		bufs.size -= uint64(len(packet.bytes))
+		t.queues.size -= uint64(len(packet.bytes))
 		if len(buf.packets) == 0 {
-			delete(bufs.bufs, best)
+			delete(t.queues.bufs, best)
 		} else {
 			// Need to update the map, since buf was retrieved by value
-			bufs.bufs[best] = buf
+			t.queues.bufs[best] = buf
 		}
 		to.sendPacket(packet.bytes)
 		return true
@@ -677,8 +700,7 @@ func (t *switchTable) handleIdle(port switchPort, bufs *switch_buffers) bool {
 
 // The switch worker does routing lookups and sends packets to where they need to be
 func (t *switchTable) doWorker() {
-	var bufs switch_buffers
+	t.queues.bufs = make(map[string]switch_buffer) // Packets per PacketStreamID (string)
-	bufs.bufs = make(map[string]switch_buffer) // Packets per PacketStreamID (string)
 	idle := make(map[switchPort]struct{})          // this is to deduplicate things
 	for {
 		select {
@@ -688,19 +710,47 @@ func (t *switchTable) doWorker() {
 				// There's nobody free to take it right now, so queue it for later
 				packet := switch_packetInfo{bytes, time.Now()}
 				streamID := switch_getPacketStreamID(packet.bytes)
-				buf := bufs.bufs[streamID]
+				buf, bufExists := t.queues.bufs[streamID]
 				buf.packets = append(buf.packets, packet)
 				buf.size += uint64(len(packet.bytes))
-				bufs.size += uint64(len(packet.bytes))
+				t.queues.size += uint64(len(packet.bytes))
-				bufs.bufs[streamID] = buf
+				// Keep a track of the max total queue size
-				bufs.cleanup(t)
+				if t.queues.size > t.queues.maxsize {
+					t.queues.maxsize = t.queues.size
+				}
+				t.queues.bufs[streamID] = buf
+				if !bufExists {
+					// Keep a track of the max total queue count. Only recalculate this
+					// when the queue is new because otherwise repeating len(dict) might
+					// cause unnecessary processing overhead
+					if len(t.queues.bufs) > t.queues.maxbufs {
+						t.queues.maxbufs = len(t.queues.bufs)
+					}
+				}
+				t.queues.cleanup(t)
 			}
 		case port := <-t.idleIn:
 			// Try to find something to send to this peer
-			if !t.handleIdle(port, &bufs) {
+			if !t.handleIdle(port) {
 				// Didn't find anything ready to send yet, so stay idle
 				idle[port] = struct{}{}
 			}
+		case f := <-t.admin:
+			f()
 		}
 	}
 }
+
+// Passed a function to call.
+// This will send the function to t.admin and block until it finishes.
+func (t *switchTable) doAdmin(f func()) {
+	// Pass this a function that needs to be run by the router's main goroutine
+	// It will pass the function to the router and wait for the router to finish
+	done := make(chan struct{})
+	newF := func() {
+		f()
+		close(done)
+	}
+	t.admin <- newF
+	<-done
+}

yggdrasilctl.go

@@ -183,6 +183,54 @@ func main() {
 					fmt.Println("Coords:", coords)
 				}
 			}
+		case "getswitchqueues":
+			maximumqueuesize := float64(4194304)
+			portqueues := make(map[float64]float64)
+			portqueuesize := make(map[float64]float64)
+			portqueuepackets := make(map[float64]float64)
+			v := res["switchqueues"].(map[string]interface{})
+			if queuecount, ok := v["queues_count"].(float64); ok {
+				fmt.Printf("Active queue count: %d queues\n", uint(queuecount))
+			}
+			if queuesize, ok := v["queues_size"].(float64); ok {
+				fmt.Printf("Active queue size: %d bytes\n", uint(queuesize))
+			}
+			if highestqueuecount, ok := v["highest_queues_count"].(float64); ok {
+				fmt.Printf("Highest queue count: %d queues\n", uint(highestqueuecount))
+			}
+			if highestqueuesize, ok := v["highest_queues_size"].(float64); ok {
+				fmt.Printf("Highest queue size: %d bytes\n", uint(highestqueuesize))
+			}
+			if m, ok := v["maximum_queues_size"].(float64); ok {
+				fmt.Printf("Maximum queue size: %d bytes\n", uint(maximumqueuesize))
+				maximumqueuesize = m
+			}
+			if queues, ok := v["queues"].([]interface{}); ok {
+				if len(queues) != 0 {
+					fmt.Println("Active queues:")
+					for _, v := range queues {
+						queueport := v.(map[string]interface{})["queue_port"].(float64)
+						queuesize := v.(map[string]interface{})["queue_size"].(float64)
+						queuepackets := v.(map[string]interface{})["queue_packets"].(float64)
+						queueid := v.(map[string]interface{})["queue_id"].(string)
+						portqueues[queueport] += 1
+						portqueuesize[queueport] += queuesize
+						portqueuepackets[queueport] += queuepackets
+						queuesizepercent := (100 / maximumqueuesize) * queuesize
+						fmt.Printf("- Switch port %d, Stream ID: %v, size: %d bytes (%d%% full), %d packets\n",
+							uint(queueport), []byte(queueid), uint(queuesize),
+							uint(queuesizepercent), uint(queuepackets))
+					}
+				}
+			}
+			if len(portqueuesize) > 0 && len(portqueuepackets) > 0 {
+				fmt.Println("Aggregated statistics by switchport:")
+				for k, v := range portqueuesize {
+					queuesizepercent := (100 / (portqueues[k] * maximumqueuesize)) * v
+					fmt.Printf("- Switch port %d, size: %d bytes (%d%% full), %d packets\n",
+						uint(k), uint(v), uint(queuesizepercent), uint(portqueuepackets[k]))
+				}
+			}
 		case "addpeer", "removepeer", "addallowedencryptionpublickey", "removeallowedencryptionpublickey":
 			if _, ok := res["added"]; ok {
 				for _, v := range res["added"].([]interface{}) {