reduce duplicated code by using a tree of Node

weed-fs/src/pkg/topology/capacity.go

@@ -1,8 +0,0 @@
-package topology
-
-import ()
-
-type StorageCapacity struct {
-	countVolumeCount int
-	maxVolumeCount   int
-}

weed-fs/src/pkg/topology/data_center.go

@@ -1,54 +1,9 @@
 package topology
 
 import (
-	"pkg/storage"
 )
 
-type DataCenterId string
 type DataCenter struct {
-	Id      DataCenterId
-	racks   map[RackId]*Rack
+	Node
 	ipRange IpRange
-
-	//transient
-	allocation StorageCapacity
-	topology   *Topology
-}
-
-func (d *DataCenter) CreateOneVolume(r int, vid storage.VolumeId) storage.VolumeId {
-	for _, rack := range d.racks {
-		freeSpace := rack.allocation.maxVolumeCount - rack.allocation.countVolumeCount
-		if r > freeSpace {
-			r -= freeSpace
-		} else {
-			rack.CreateOneVolume(r, vid)
-		}
-	}
-	return vid
-}
-func (d *DataCenter) AddVolume(rack *Rack, v *storage.VolumeInfo) {
-	d.allocation.countVolumeCount += 1
-	d.topology.AddVolume(d, v)
-}
-func (d *DataCenter) AddNode(rack *Rack, n *Node) {
-	d.allocation.countVolumeCount += len(n.volumes)
-	d.allocation.maxVolumeCount += n.maxVolumeCount
-	d.topology.AddNode(d, n)
-}
-func (d *DataCenter) RemoveNode(rack *Rack, n *Node) {
-	d.allocation.countVolumeCount -= len(n.volumes)
-	d.allocation.maxVolumeCount -= n.maxVolumeCount
-	d.topology.RemoveNode(d, n)
-}
-func (d *DataCenter) AddRack(rack *Rack) {
-	d.racks[rack.Id] = rack
-	d.allocation.countVolumeCount += rack.allocation.countVolumeCount
-	d.allocation.maxVolumeCount += rack.allocation.maxVolumeCount
-	d.topology.AddRack(d, rack)
-}
-func (d *DataCenter) RemoveRack(rack *Rack) {
-	delete(d.racks, rack.Id)
-	d.allocation.countVolumeCount -= rack.allocation.countVolumeCount
-	d.allocation.maxVolumeCount -= rack.allocation.maxVolumeCount
-	d.topology.AddRack(d, rack)
 }

weed-fs/src/pkg/topology/node.go

@@ -6,20 +6,56 @@ import (
 
 type NodeId string
 type Node struct {
-	volumes     map[storage.VolumeId]*storage.VolumeInfo
+	id                  NodeId
+	countVolumeCount    int
+	reservedVolumeCount int
 	maxVolumeCount      int
-	Ip          NodeId
-	Port        int
-	PublicUrl   string
+	parent              *Node
+	children            map[NodeId]*Node
+	isLeaf              bool
+}
 
-	//transient
-	rack *Rack
+func (n *Node) ReserveOneVolume(r int, vid storage.VolumeId) bool {
+	for _, node := range n.children {
+		freeSpace := node.maxVolumeCount - node.countVolumeCount - node.reservedVolumeCount
+		if r > freeSpace {
+			r -= freeSpace
+		} else {
+			if node.ReserveOneVolume(r, vid) {
+				node.reservedVolumeCount++
+				return true
+			} else {
+				return false
+			}
+		}
+	}
+	return false
 }
-func (n *Node) CreateOneVolume(r int, vid storage.VolumeId) storage.VolumeId {
-  n.AddVolume(&storage.VolumeInfo{Id:vid, Size: 32*1024*1024*1024})
-  return vid
+
+func (n *Node) AddVolume(v *storage.VolumeInfo) {
+	n.countVolumeCount++
+	if n.reservedVolumeCount > 0 { //if reserved
+		n.reservedVolumeCount--
+	}
+	if n.parent != nil {
+		n.parent.AddVolume(v)
+	}
 }
-func (n *Node) AddVolume(v *storage.VolumeInfo){
-  n.volumes[v.Id] = v
-  n.rack.AddVolume(n,v)
+
+func (n *Node) AddNode(node *Node) {
+	n.children[node.id] = node
+	n.countVolumeCount += node.countVolumeCount
+	n.maxVolumeCount += node.maxVolumeCount
+	if n.parent != nil {
+		n.parent.AddNode(node)
+	}
+}
+
+func (n *Node) RemoveNode(node *Node) {
+	delete(n.children, node.id)
+	n.countVolumeCount -= node.countVolumeCount
+	n.maxVolumeCount -= node.maxVolumeCount
+	if n.parent != nil {
+		n.parent.RemoveNode(node)
+	}
 }

weed-fs/src/pkg/topology/rack.go

@@ -1,43 +1,9 @@
 package topology
 
 import (
-  "pkg/storage"
 )
 
-type RackId uint32
 type Rack struct {
-	Id      RackId
-	nodes   map[NodeId]*Node
+	Node
 	ipRange IpRange
-	
-  //transient
-  allocation StorageCapacity
-  dataCenter *DataCenter
-}
-func (rack *Rack) CreateOneVolume(r int, vid storage.VolumeId) storage.VolumeId {
-  for _, node := range rack.nodes {
-    freeSpace := node.maxVolumeCount - len(node.volumes)
-    if r > freeSpace {
-      r -= freeSpace
-    } else {
-      node.CreateOneVolume(r, vid)
-    }
-  }
-  return vid
-}
-func (r *Rack) AddVolume(n *Node, v *storage.VolumeInfo){
-  r.allocation.countVolumeCount += 1
-  r.dataCenter.AddVolume(r,v)
-}
-func (r *Rack) AddNode(n *Node){
-  r.nodes[n.Ip] = n
-  r.allocation.countVolumeCount += len(n.volumes)
-  r.allocation.maxVolumeCount += n.maxVolumeCount
-  r.dataCenter.AddNode(r,n)
-}
-func (r *Rack) RemoveNode(n *Node){
-  delete(r.nodes,n.Ip)
-  r.allocation.countVolumeCount -= len(n.volumes)
-  r.allocation.maxVolumeCount -= n.maxVolumeCount
-  r.dataCenter.RemoveNode(r,n)
 }

weed-fs/src/pkg/topology/server.go

@@ -0,0 +1,21 @@
+package topology
+
+import (
+  "pkg/storage"
+)
+
+type Server struct {
+  Node
+	volumes     map[storage.VolumeId]*storage.VolumeInfo
+	Ip          NodeId
+	Port        int
+	PublicUrl   string
+}
+func (s *Server) CreateOneVolume(r int, vid storage.VolumeId) storage.VolumeId {
+  s.AddVolume(&storage.VolumeInfo{Id:vid, Size: 32*1024*1024*1024})
+  return vid
+}
+func (s *Server) AddVolume(v *storage.VolumeInfo){
+  s.volumes[v.Id] = v
+  s.Node.AddVolume(v)
+}

weed-fs/src/pkg/topology/topology.go

@@ -6,56 +6,15 @@ import (
 )
 
 type Topology struct {
-	datacenters map[DataCenterId]*DataCenter
-
-	//transient
-	allocation StorageCapacity
+  Node
 }
 
-//FIXME
-func (t *Topology) RandomlyCreateOneVolume() storage.VolumeId {
-	r := rand.Intn(t.allocation.maxVolumeCount-t.allocation.countVolumeCount)
+func (t *Topology) RandomlyCreateOneVolume() (bool,storage.VolumeId) {
+  r := rand.Intn(t.Node.maxVolumeCount-t.Node.countVolumeCount-t.Node.reservedVolumeCount)
   vid := t.nextVolumeId()
-	for _, d := range t.datacenters {
-	  freeSpace := d.allocation.maxVolumeCount-d.allocation.countVolumeCount
-	  if r>freeSpace{
-	    r -= freeSpace
-	  }else{
-	    d.CreateOneVolume(r, vid)
-	    return vid
-	  }
-	}
-	return storage.VolumeId(0) //FIXME
+  return t.Node.ReserveOneVolume(r,vid), vid
 }
+
 func (t *Topology) nextVolumeId() storage.VolumeId {
 	return storage.VolumeId(0)
 }
-func (t *Topology) AddVolume(d *DataCenter, v *storage.VolumeInfo) {
-	t.allocation.countVolumeCount += 1
-}
-func (t *Topology) AddNode(d *DataCenter, n *Node){
-  t.allocation.countVolumeCount += len(n.volumes)
-  t.allocation.maxVolumeCount += n.maxVolumeCount
-}
-func (t *Topology) RemoveNode(d *DataCenter, n *Node){
-  t.allocation.countVolumeCount -= len(n.volumes)
-  t.allocation.maxVolumeCount -= n.maxVolumeCount
-}
-func (t *Topology) AddRack(d *DataCenter, rack *Rack){
-  t.allocation.countVolumeCount += rack.allocation.countVolumeCount
-  t.allocation.maxVolumeCount += rack.allocation.maxVolumeCount
-}
-func (t *Topology) RemoveRack(d *DataCenter, rack *Rack){
-  t.allocation.countVolumeCount -= rack.allocation.countVolumeCount
-  t.allocation.maxVolumeCount -= rack.allocation.maxVolumeCount
-}
-func (t *Topology) AddDataCenter(d *DataCenter) {
-  t.datacenters[d.Id] = d
-	t.allocation.countVolumeCount += d.allocation.countVolumeCount
-	t.allocation.maxVolumeCount += d.allocation.maxVolumeCount
-}
-func (t *Topology) RemoveDataCenter(d *DataCenter) {
-  delete(t.datacenters,d.Id)
-  t.allocation.countVolumeCount -= d.allocation.countVolumeCount
-  t.allocation.maxVolumeCount -= d.allocation.maxVolumeCount
-}