implement result handler

src/profile/bookmark.rs

@@ -1,7 +1,9 @@
 mod database;
+mod error;
 mod memory;
 
 use database::Database;
+use error::Error;
 use memory::Memory;
 
 use gtk::glib::DateTime;
@@ -24,7 +26,9 @@ impl Bookmark {
 
         // Build initial index
         for record in database.records(None) {
-            memory.set(record.request, record.time)
+            if memory.add(record.request, record.time).is_err() {
+                todo!()
+            }
         }
 
         // Return new `Self`
@@ -44,21 +48,30 @@ impl Bookmark {
         }
     }
 
-    /// Toggle record in bookmarks database, update emory index
-    pub fn toggle(&self, request: &str) {
+    /// Toggle record in `database` and `memory` index
+    pub fn toggle(&self, request: &str) -> Result<(), Error> {
+        // Get current timestamp for new record
         let time = DateTime::now_local().unwrap();
 
+        // Delete record if exists
         if self.has_request(request, false) {
             match self.database.delete(request) {
-                Ok(_) => self.memory.delete(request),
-                Err(_) => todo!(),
+                Ok(_) => match self.memory.delete(request) {
+                    Ok(_) => Ok(()),
+                    Err(_) => Err(Error::MemoryDelete),
+                },
+                Err(_) => Err(Error::DatabaseDelete),
             }
+        // Otherwise, create new record
         } else {
             match self.database.add(time.clone(), request.into()) {
-                Ok(_) => self.memory.set(request.into(), time),
-                Err(_) => todo!(),
-            };
-        }
+                Ok(_) => match self.memory.add(request.into(), time) {
+                    Ok(_) => Ok(()),
+                    Err(_) => Err(Error::MemoryAdd),
+                },
+                Err(_) => Err(Error::DatabaseAdd),
+            }
+        } // @TODO return affected rows on success?
     }
 }
 

src/profile/bookmark/error.rs

@@ -0,0 +1,6 @@
+pub enum Error {
+    DatabaseAdd,
+    DatabaseDelete,
+    MemoryAdd,
+    MemoryDelete,
+}

src/profile/bookmark/memory.rs

@@ -1,7 +1,10 @@
+mod error;
+use error::Error;
+
 use gtk::glib::DateTime;
 use std::{cell::RefCell, collections::HashMap};
 
-/// Reduce disk usage by cache results in memory
+/// Reduce disk usage by cache Bookmarks index in memory
 pub struct Memory {
     index: RefCell<HashMap<String, DateTime>>,
 }
@@ -18,33 +21,24 @@ impl Memory {
 
     // Actions
 
-    /// Set new record
-    /// * replace existing record with new value
-    pub fn set(&self, request: String, time: DateTime) {
-        // Borrow index to update
-        let mut index = self.index.borrow_mut();
-
-        // Cleanup previous record
-        if index.get(&request).is_some() {
-            index.remove(&request);
-        }
-
-        // Insert new record with actual data
-        index.insert(request, time);
-    }
-
-    /// Check request exist in memory index
-    pub fn delete(&self, request: &str) {
-        // Borrow index to update
-        let mut index = self.index.borrow_mut();
-
-        // Delete record (if exist)
-        if index.get(request).is_some() {
-            index.remove(request);
+    /// Add new record for given `request`
+    /// * validates record with same key does not exist yet
+    pub fn add(&self, request: String, time: DateTime) -> Result<(), Error> {
+        match self.index.borrow_mut().insert(request, time) {
+            Some(_) => Err(Error::Overwrite),
+            None => Ok(()),
         }
     }
 
-    /// Check request exist in memory index
+    /// Delete record from index by `request`
+    pub fn delete(&self, request: &str) -> Result<(), Error> {
+        match self.index.borrow_mut().remove(request) {
+            Some(_) => Ok(()),
+            None => Err(Error::NotFound),
+        }
+    }
+
+    /// Check `request` exist in memory index
     pub fn is_exist(&self, request: &str) -> bool {
         self.index.borrow().get(request).is_some()
     }

src/profile/bookmark/memory/error.rs

@@ -0,0 +1,4 @@
+pub enum Error {
+    NotFound,
+    Overwrite,
+}