Add total number of commitments to getblockchaininfo

src/zcash/IncrementalMerkleTree.cpp

@@ -81,6 +81,25 @@ Hash IncrementalMerkleTree<Depth, Hash>::last() const {
     }
 }
 
+template<size_t Depth, typename Hash>
+size_t IncrementalMerkleTree<Depth, Hash>::size() const {
+    size_t ret = 0;
+    if (left) {
+        ret++;
+    }
+    if (right) {
+        ret++;
+    }
+    // Treat occupation of parents array as a binary number
+    // (right-shifted by 1)
+    for (size_t i = 0; i < parents.size(); i++) {
+        if (parents[i]) {
+            ret += (1 << (i+1));
+        }
+    }
+    return ret;
+}
+
 template<size_t Depth, typename Hash>
 void IncrementalMerkleTree<Depth, Hash>::append(Hash obj) {
     if (is_complete(Depth)) {