[FAB-18509] Stop panic of collection index path is wrong (#2726)

Signed-off-by: Matthew B White <whitemat@uk.ibm.com>
(cherry picked from commit 1249da2)

core/ledger/kvledger/txmgmt/privacyenabledstate/db.go

@@ -420,27 +420,30 @@ type indexInfo struct {
 
 const (
 	// Example for chaincode indexes:
-	// "META-INF/statedb/couchdb/indexes/indexColorSortName.json"
+	// "META-INF/statedb/couchdb/indexes"
 	chaincodeIndexDirDepth = 3
+
 	// Example for collection scoped indexes:
-	// "META-INF/statedb/couchdb/collections/collectionMarbles/indexes/indexCollMarbles.json"
+	// "META-INF/statedb/couchdb/collections/collectionMarbles/indexes"
 	collectionDirDepth      = 3
 	collectionNameDepth     = 4
 	collectionIndexDirDepth = 5
 )
 
+// Note previous functions will have ensured that the path starts
+// with 'META-INF/statedb' and does not have leading or trailing
+// path deliminators.
 func getIndexInfo(indexPath string) *indexInfo {
 	indexInfo := &indexInfo{}
-	dirsDepth := strings.Split(indexPath, "/")
+	pathParts := strings.Split(indexPath, "/")
+	pathDepth := len(pathParts)
+
 	switch {
-	case len(dirsDepth) > chaincodeIndexDirDepth &&
-		dirsDepth[chaincodeIndexDirDepth] == "indexes":
+	case pathDepth > chaincodeIndexDirDepth && pathParts[chaincodeIndexDirDepth] == "indexes":
 		indexInfo.hasIndexForChaincode = true
-	case len(dirsDepth) > collectionDirDepth &&
-		dirsDepth[collectionDirDepth] == "collections" &&
-		dirsDepth[collectionIndexDirDepth] == "indexes":
+	case pathDepth > collectionIndexDirDepth && pathParts[collectionDirDepth] == "collections" && pathParts[collectionIndexDirDepth] == "indexes":
 		indexInfo.hasIndexForCollection = true
-		indexInfo.collectionName = dirsDepth[collectionNameDepth]
+		indexInfo.collectionName = pathParts[collectionNameDepth]
 	}
 	return indexInfo
 }

core/ledger/kvledger/txmgmt/privacyenabledstate/db_test.go

@@ -49,7 +49,7 @@ func TestHealthCheckRegister(t *testing.T) {
 }
 
 func TestGetIndexInfo(t *testing.T) {
-	chaincodeIndexPath := "META-INF/statedb/couchdb/indexes/indexColorSortName.json"
+	chaincodeIndexPath := "META-INF/statedb/couchdb/indexes"
 	actualIndexInfo := getIndexInfo(chaincodeIndexPath)
 	expectedIndexInfo := &indexInfo{
 		hasIndexForChaincode:  true,
@@ -58,7 +58,7 @@ func TestGetIndexInfo(t *testing.T) {
 	}
 	require.Equal(t, expectedIndexInfo, actualIndexInfo)
 
-	collectionIndexPath := "META-INF/statedb/couchdb/collections/collectionMarbles/indexes/indexCollMarbles.json"
+	collectionIndexPath := "META-INF/statedb/couchdb/collections/collectionMarbles/indexes"
 	actualIndexInfo = getIndexInfo(collectionIndexPath)
 	expectedIndexInfo = &indexInfo{
 		hasIndexForChaincode:  false,
@@ -67,7 +67,7 @@ func TestGetIndexInfo(t *testing.T) {
 	}
 	require.Equal(t, expectedIndexInfo, actualIndexInfo)
 
-	incorrectChaincodeIndexPath := "META-INF/statedb/couchdb/indexColorSortName.json"
+	incorrectChaincodeIndexPath := "META-INF/statedb/couchdb"
 	actualIndexInfo = getIndexInfo(incorrectChaincodeIndexPath)
 	expectedIndexInfo = &indexInfo{
 		hasIndexForChaincode:  false,
@@ -76,11 +76,15 @@ func TestGetIndexInfo(t *testing.T) {
 	}
 	require.Equal(t, expectedIndexInfo, actualIndexInfo)
 
-	incorrectCollectionIndexPath := "META-INF/statedb/couchdb/collections/indexes/indexCollMarbles.json"
+	incorrectCollectionIndexPath := "META-INF/statedb/couchdb/collections/indexes"
 	actualIndexInfo = getIndexInfo(incorrectCollectionIndexPath)
 	require.Equal(t, expectedIndexInfo, actualIndexInfo)
 
-	incorrectIndexPath := "META-INF/statedb/"
+	incorrectCollectionIndexPath = "META-INF/statedb/couchdb/collections"
+	actualIndexInfo = getIndexInfo(incorrectCollectionIndexPath)
+	require.Equal(t, expectedIndexInfo, actualIndexInfo)
+
+	incorrectIndexPath := "META-INF/statedb"
 	actualIndexInfo = getIndexInfo(incorrectIndexPath)
 	require.Equal(t, expectedIndexInfo, actualIndexInfo)
 }