lib.rs

            let mut wal_file = try!(OpenOptions::new().read(true).write(true).create(true).open(tree_file_path.to_owned() + ".wal"));

            // if we have a WAL file, just replay it into the mem_tree
            if try!(wal_file.metadata()).len() != 0 {
                let mut buff = vec![0; node_size];

                while true {
                    match wal_file.read_exact(&mut buff) {
                        Ok(_) => {
                            let k = try!(decode(&buff[0..max_key_size]));
                            let v = try!(decode(&buff[max_key_size..max_value_size]));
                            mem_tree.insert(k,v);
                        },
                        Err(e) => if e.kind() == ErrorKind::UnexpectedEof {
                            break
                        } else {
                            return Err(From::from(e));
                        }
                    }
                }
            }