fix SQLite bug when migrating database from 1 to 2 (#136)

client/src/nat.rs

@@ -21,7 +21,11 @@ pub struct NatTraverse<'a> {
 }
 
 impl<'a> NatTraverse<'a> {
-    pub fn new(interface: &'a InterfaceName, backend: Backend, diffs: &[PeerDiff]) -> Result<Self, Error> {
+    pub fn new(
+        interface: &'a InterfaceName,
+        backend: Backend,
+        diffs: &[PeerDiff],
+    ) -> Result<Self, Error> {
         let mut remaining: Vec<_> = diffs.iter().filter_map(|diff| diff.new).cloned().collect();
 
         for peer in &mut remaining {

server/src/db/peer.rs

@@ -3,7 +3,7 @@ use crate::ServerError;
 use lazy_static::lazy_static;
 use regex::Regex;
 use rusqlite::{params, types::Type, Connection};
-use shared::{Endpoint, Peer, PeerContents, PERSISTENT_KEEPALIVE_INTERVAL_SECS};
+use shared::{Peer, PeerContents, PERSISTENT_KEEPALIVE_INTERVAL_SECS};
 use std::{
     net::IpAddr,
     ops::{Deref, DerefMut},
@@ -240,10 +240,14 @@ impl DatabasePeer {
         let invite_expires = row
             .get::<_, Option<u64>>(9)?
             .map(|unixtime| SystemTime::UNIX_EPOCH + Duration::from_secs(unixtime));
-        let candidates_str: String = row.get(10)?;
+
-        let candidates: Vec<Endpoint> = serde_json::from_str(&candidates_str).map_err(|_| {
+        let candidates = if let Some(candidates) = row.get::<_, Option<String>>(10)? {
+            serde_json::from_str(&candidates).map_err(|_| {
                 rusqlite::Error::InvalidColumnType(10, "candidates (json)".into(), Type::Text)
-        })?;
+            })?
+        } else {
+            vec![]
+        };
 
         let persistent_keepalive_interval = Some(PERSISTENT_KEEPALIVE_INTERVAL_SECS);