Initial work on FFI

src/utils/string_key.rs

@@ -42,8 +42,7 @@ impl StringKey {
     /// Creates a new StringKey. If we can find a value for this StringKey in the cache, we re-use
     /// that value.
     pub fn new(s: &str) -> Self {
-        let s: ArcStr = s.into();
-        let hash = StringKey::get_hash(s.as_str());
+        let hash = Self::get_hash(s);
         {
             let cache_read = STRING_CACHE.read();
             let cached_value = cache_read.get(&hash);
@@ -55,8 +54,15 @@ impl StringKey {
             }
         }
         {
-            let v = Self { str: s.clone(), hash };
             let mut cache_write = STRING_CACHE.write();
+            if let Some(cached_value) = cache_write.get(&hash) {
+                return Self {
+                    str: cached_value.clone(),
+                    hash,
+                };
+            }
+            let s: ArcStr = s.into();
+            let v = Self { str: s.clone(), hash };
             cache_write.insert(hash, s);
             v
         }
@@ -112,7 +118,7 @@ impl Display for StringKey {
 
 impl Into<StringKey> for &CStr {
     fn into(self) -> StringKey {
-        StringKey::new(self.to_str().unwrap().into())
+        StringKey::new(self.to_str().unwrap())
     }
 }
 /// Converts a character to lowercased in a const safe way.