From 99d6a56336c8c6e5a3e5fb9f132bb15157fc1525 Mon Sep 17 00:00:00 2001
From: Vika <vika@fireburn.ru>
Date: Thu, 2 Dec 2021 00:52:24 +0300
Subject: Get rid of the unsafe code

Thanks to @Kloenk I was able to get rid of the unsafety and
tell the compiler how to properly check what I needed for
the StorageError to be declared thread-safe.
---
 src/database/mod.rs | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/src/database/mod.rs b/src/database/mod.rs
index 4e74c8f..339439d 100644
--- a/src/database/mod.rs
+++ b/src/database/mod.rs
@@ -46,13 +46,10 @@ pub enum ErrorKind {
 #[derive(Debug)]
 pub struct StorageError {
     msg: String,
-    source: Option<Box<dyn std::error::Error>>,
+    source: Option<Box<dyn std::error::Error + Send + Sync>>,
     kind: ErrorKind,
 }
-// XXX figure out what makes this un-sendable by default
-// and if it's sound to mark StorageError as Send & Sync
-unsafe impl Send for StorageError {}
-unsafe impl Sync for StorageError {}
+
 impl From<StorageError> for tide::Response {
     fn from(err: StorageError) -> Self {
         tide::Response::builder(match err.kind() {
@@ -73,7 +70,7 @@ impl From<StorageError> for tide::Response {
 }
 impl std::error::Error for StorageError {
     fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
-        self.source.as_ref().map(|e| e.as_ref())
+        self.source.as_ref().map(|e| e.as_ref() as &dyn std::error::Error)
     }
 }
 impl From<serde_json::Error> for StorageError {
@@ -118,7 +115,7 @@ impl StorageError {
         }
     }
     /// Create a StorageError using another arbitrary Error as a source.
-    fn with_source(kind: ErrorKind, msg: &str, source: Box<dyn std::error::Error>) -> Self {
+    fn with_source(kind: ErrorKind, msg: &str, source: Box<dyn std::error::Error + Send + Sync>) -> Self {
         Self {
             msg: msg.to_string(),
             source: Some(source),
-- 
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