Fixed problem with growing stats file

CHANGELOG.md

@@ -7,6 +7,7 @@ This project follows [semantic versioning](http://semver.org).
 - [added] Added feature to disable special NAT support
 - [changed] Improved port forwarding on quirky routers
 - [changed] Reduced peer timeout to 5min to work better with NAT
+- [fixed] Fixed problem with growing stats file
 
 ### v1.2.1 (2019-12-22)
 

src/cloud.rs

@@ -8,7 +8,7 @@ use std::{
     fmt,
     fs::{self, File},
     hash::BuildHasherDefault,
-    io::{self, Write},
+    io::{self, Seek, SeekFrom, Write},
     marker::PhantomData,
     net::{SocketAddr, ToSocketAddrs},
     path::Path
@@ -585,6 +585,7 @@ impl<D: Device, P: Protocol, T: Table, S: Socket, TS: TimeSource> GenericCloud<D
     fn write_out_stats(&mut self) -> Result<(), io::Error> {
         if let Some(ref mut f) = self.stats_file {
             debug!("Writing out stats");
+            f.seek(SeekFrom::Start(0))?;
             f.set_len(0)?;
             self.peers.write_out(f)?;
             writeln!(f)?;