Fix bugs (#93)

* fix(repl): pass null pointer instead of empty string

* fix(peerstate): ensure load and store to the db works

src/key.rs

@@ -99,21 +99,17 @@ impl Key {
         match res {
             Ok(key) => Some(key),
             Err(err) => {
-                eprintln!("Invalid key bytes: {:?}\n{}", err, hex::encode(bytes));
+                eprintln!("Invalid key bytes: {:?}", err);
                 None
             }
         }
     }
 
-    pub fn from_binary(
-        data: *const libc::c_void,
-        len: libc::c_int,
-        key_type: KeyType,
-    ) -> Option<Self> {
+    pub fn from_binary(data: *const u8, len: libc::c_int, key_type: KeyType) -> Option<Self> {
         assert!(!data.is_null(), "missing data");
         assert!(len > 0);
 
-        let bytes = unsafe { slice::from_raw_parts(data as *const u8, len as usize) };
+        let bytes = unsafe { slice::from_raw_parts(data, len as usize) };
         Self::from_slice(bytes, key_type)
     }
 
@@ -124,9 +120,7 @@ impl Key {
     ) -> Option<Self> {
         assert!(!stmt.is_null(), "missing statement");
 
-        let data = unsafe {
-            sqlite3_column_blob(stmt, index) as *mut libc::c_uchar as *const libc::c_void
-        };
+        let data = unsafe { sqlite3_column_blob(stmt, index) as *const u8 };
         let len = unsafe { sqlite3_column_bytes(stmt, index) };
 
         Self::from_binary(data, len, key_type)