.

wcfs/internal/xbtree/δbtail.go

@@ -87,6 +87,7 @@ type ΔTail struct {
 }
 
 // ΔRoots describes which BTrees were change in one revision.
+// XXX kill?
 type ΔRoots struct {
 	Rev     zodb.Tid
 	Changev []*Tree	// root XXX -> Oid?	XXX -> SetTree?
@@ -105,7 +106,8 @@ type ΔTreeTail struct {
 // ΔTree describes changes to one BTree in one revision.
 type ΔTree struct {
 	Rev  zodb.Tid
-	Change map[Key]Value
+	Root *Tree		// XXX ok to have here?
+	KV   map[Key]Value
 }
 
 // NewΔTail creats new empty ΔTail object.
@@ -175,7 +177,7 @@ func (δb *ΔTail) Track(path []Node) {	// XXX Tree|Bucket; path[0] = root
 // only those keys, that correspond to tracked subset of δZ.
 //
 // XXX returned [](root, []key) -> move to separate SliceByRev to get diff?
-func (btail *ΔTail) Update(δZ *zodb.EventCommit) (δB ΔRoots) {
+func (btail *ΔTail) Update(δZ *zodb.EventCommit) []ΔTree {
 	btail.δZtail.Append(δZ.Tid, δZ.Changev)
 
 	// {} root -> []oid changed under that root
@@ -190,14 +192,14 @@ func (btail *ΔTail) Update(δZ *zodb.EventCommit) (δB ΔRoots) {
 		}
 	}
 
-	δB.Rev = δZ.Tid
 	if len(δZByRoot) == 0 {
-		return δB // tracked set not changed
+		return nil // tracked set not changed
 	}
 
 	// XXX stub to get file.size invalidation working
+	var δB []ΔTree
 	for root := range δZByRoot {
-		δB.Changev = append(δB.Changev, root)
+		δB = append(δB, ΔTree{δZ.Tid, root, nil})
 	}
 	return δB
 

wcfs/δftail.go

@@ -68,22 +68,28 @@ func (δf *ΔFTail) Track(file *BigFile, path []btree.LONode) {
 // XXX
 func (δf *ΔFTail) Update(δZ *zodb.EventCommit) ΔFentry {
 	δB := δf.ΔTail.Update(δZ)
-	var changev []ΔFile // δB.Changev root -> file (via .fileIdx)
-	for _, δ := range δB.Changev {
+	var changev []ΔFile // δB root -> file (via .fileIdx)
+	for _, δ := range δB {
 		files := δf.fileIdx[δ.Root]
 		if len(files) == 0 {
 			panicf("ΔFTail: root<%s> -> ø file", δ.Root.POid())
 		}
 		for file := range files {
+			var blkv []int64
+			for blk /*, zblk*/ := range δ.KV {
+				// FIXME stub - need to take both keys and zblk changes into account
+				// XXX document, and in particular how to include atTail
+				blkv = append(blkv, blk)
+			}
 			changev = append(changev, ΔFile{
 				File: file,
-				Blkv: δ.Keyv,
+				Blkv: blkv,
 			})
 		}
 	}
 
 	return ΔFentry{
-		Rev:     δB.Rev,
+		Rev:     δZ.Tid,
 		Changev: changev,
 	}
 }