makediff func with UT case

weed/storage/volume_vacuum_test.go

@@ -0,0 +1,53 @@
+package storage
+
+import (
+	"testing"
+)
+
+/*
+makediff test steps
+1. launch weed server at your local/dev environment, (option
+"garbageThreshold" for master and option "max" for volume should be set with specific value which would let
+preparing test prerequisite easier )
+   a) ./weed master -garbageThreshold=0.99 -mdir=./m
+   b) ./weed volume -dir=./data -max=1 -mserver=localhost:9333 -port=8080
+2. upload 4 different files, you could call dir/assign to get 4 different fids
+   a)  upload file A with fid a
+   b)  upload file B with fid b
+   c)  upload file C with fid c
+   d)  upload file D with fid d
+3. update file A and C
+   a)  modify file A and upload file A with fid a
+   b)  modify file C and upload file C with fid c
+   c)  record the current 1.idx's file size(lastCompactIndexOffset value)
+4. Compacting the data file
+   a)  run curl http://localhost:8080/admin/vacuum/compact?volumeId=1
+   b)  verify the 1.cpd and 1.cpx is created under volume directory
+5. update file B and delete file D
+   a)  modify file B and upload file B with fid b
+   d)  delete file B with fid b
+6. Now you could run the following UT case, the case should be run successfully
+7. Compact commit manually
+   a)  mv 1.cpd 1.dat
+   b)  mv 1.cpx 1.idx
+8. Restart Volume Server
+9. Now you should get updated file A,B,C
+*/
+
+func TestMakeDiff(t *testing.T) {
+
+	v := new(Volume)
+	//lastCompactIndexOffset value is the index file size before step 4
+	v.lastCompactIndexOffset = 96
+	v.SuperBlock.version = 0x2
+	err := v.makeupDiff(
+		"/yourpath/1.cpd",
+		"/yourpath/1.cpx",
+		"/yourpath/1.dat",
+		"/yourpath/1.idx")
+	if err != nil {
+		t.Errorf("makeupDiff err is %v", err)
+	} else {
+		t.Log("makeupDiff Succeeded")
+	}
+}