add sql.query_map

src/context.rs

@@ -670,38 +670,29 @@ pub unsafe fn dc_get_version_str() -> *mut libc::c_char {
 
 pub fn dc_get_fresh_msgs(context: &Context) -> *mut dc_array_t {
     let show_deaddrop = 0;
-    let ret = unsafe { dc_array_new(128 as size_t) };
-    if ret.is_null() {
-        return ret;
-    }
 
-    let conn_lock = context.sql.get_conn();
-    if let Some(ref mut stmt) = conn_lock.as_ref().and_then(|conn| {
-        conn.prepare(
+    context
+        .sql
+        .query_map(
             "SELECT m.id FROM msgs m LEFT JOIN contacts ct \
              ON m.from_id=ct.id LEFT JOIN chats c ON m.chat_id=c.id WHERE m.state=?   \
              AND m.hidden=0   \
              AND m.chat_id>?   \
              AND ct.blocked=0   \
              AND (c.blocked=0 OR c.blocked=?) ORDER BY m.timestamp DESC,m.id DESC;",
-        )
-        .ok()
-    }) {
-        match stmt.query_map(&[10, 9, if 0 != show_deaddrop { 2 } else { 0 }], |row| {
-            row.get(0)
-        }) {
-            Ok(rows) => {
-                for row in rows {
-                    if let Ok(id) = row {
-                        unsafe { dc_array_add_id(ret, id) };
-                    }
-                }
-            }
-            Err(_err) => {}
-        }
-    }
+            &[10, 9, if 0 != show_deaddrop { 2 } else { 0 }],
+            |row| row.get(0),
+            |rows| {
+                let ret = unsafe { dc_array_new(128 as size_t) };
 
-    ret
+                for row in rows {
+                    let id = row?;
+                    unsafe { dc_array_add_id(ret, id) };
+                }
+                Ok(ret)
+            },
+        )
+        .unwrap()
 }
 
 pub fn dc_search_msgs(

src/dc_sqlite3.rs

@@ -59,6 +59,27 @@ impl SQLite {
         self.connection.read().unwrap()
     }
 
+    pub fn query_map<T, P, F, G, H>(
+        &self,
+        sql: &str,
+        params: P,
+        f: F,
+        mut g: G,
+    ) -> rusqlite::Result<H>
+    where
+        P: IntoIterator,
+        P::Item: rusqlite::ToSql,
+        F: FnMut(&rusqlite::Row) -> rusqlite::Result<T>,
+        G: FnMut(rusqlite::MappedRows<F>) -> rusqlite::Result<H>,
+    {
+        let conn_lock = self.connection.read().unwrap();
+        let conn = conn_lock.as_ref().expect("database closed");
+
+        let mut stmt = conn.prepare(sql)?;
+        let res = stmt.query_map(params, f)?;
+        g(res)
+    }
+
     pub fn query_row<T, P, F>(&self, sql: &str, params: P, f: F) -> rusqlite::Result<T>
     where
         P: IntoIterator,