Replace try with ?

src/bin/fill-in-user-id.rs

@@ -67,16 +67,16 @@ fn update(app: &App, tx: &postgres::transaction::Transaction) {
         println!("attempt: {}/{}", id, login);
         let res = (|| -> CargoResult<()> {
             let url = format!("/users/{}", login);
-            let (handle, resp) = try!(http::github(app, &url, &token));
-            let ghuser: GithubUser = try!(http::parse_github_response(handle, resp));
+            let (handle, resp) = http::github(app, &url, &token)?;
+            let ghuser: GithubUser = http::parse_github_response(handle, resp)?;
             if let Some(ref avatar) = avatar {
                 if !avatar.contains(&ghuser.id.to_string()) {
                     return Err(human(format!("avatar: {}", avatar)))
                 }
             }
             if ghuser.login == login {
-                try!(tx.execute("UPDATE users SET gh_id = $1 WHERE id = $2",
-                                &[&ghuser.id, &id]));
+                tx.execute("UPDATE users SET gh_id = $1 WHERE id = $2",
+                           &[&ghuser.id, &id])?;
                 Ok(())
             } else {
                 Err(human(format!("different login: {}", ghuser.login)))

src/bin/populate.rs

@@ -38,10 +38,10 @@ fn update(tx: &postgres::transaction::Transaction) -> postgres::Result<()> {
         for day in 0..90 {
             let moment = now + Duration::days(-day);
             dls += rng.gen_range(-100, 100);
-            try!(tx.execute("INSERT INTO version_downloads \
+            tx.execute("INSERT INTO version_downloads \
                               (version_id, downloads, date) \
                               VALUES ($1, $2, $3)",
-                            &[&id, &dls, &moment]));
+                       &[&id, &dls, &moment])?;
         }
     }
     Ok(())

src/bin/update-downloads.rs

@@ -36,20 +36,20 @@ fn update(conn: &postgres::GenericConnection) -> postgres::Result<()> {
     loop {
         // FIXME(rust-lang/rust#27401): weird declaration to make sure this
         // variable gets dropped.
-        let tx; tx = try!(conn.transaction());
+        let tx; tx = conn.transaction()?;
         {
-            let stmt = try!(tx.prepare("SELECT * FROM version_downloads \
+            let stmt = tx.prepare("SELECT * FROM version_downloads \
                                         WHERE processed = FALSE AND id > $1
                                         ORDER BY id ASC
-                                        LIMIT $2"));
-            let mut rows = try!(stmt.query(&[&max, &LIMIT]));
-            match try!(collect(&tx, &mut rows)) {
+                                        LIMIT $2")?;
+            let mut rows = stmt.query(&[&max, &LIMIT])?;
+            match collect(&tx, &mut rows)? {
                 None => break,
                 Some(m) => max = m,
             }
         }
         tx.set_commit();
-        try!(tx.finish());
+        tx.finish()?;
     }
     Ok(())
 }
@@ -87,10 +87,10 @@ fn collect(tx: &postgres::transaction::Transaction,
 
         // Flag this row as having been processed if we're passed the cutoff,
         // and unconditionally increment the number of counted downloads.
-        try!(tx.execute("UPDATE version_downloads
+        tx.execute("UPDATE version_downloads
                          SET processed = $2, counted = counted + $3
                          WHERE id = $1",
-                        &[id, &(download.date < cutoff), &amt]));
+                   &[id, &(download.date < cutoff), &amt])?;
         println!("{}\n{}", time::at(download.date).rfc822(),
                  time::at(cutoff).rfc822());
         total += amt as i64;
@@ -102,31 +102,31 @@ fn collect(tx: &postgres::transaction::Transaction,
         let crate_id = Version::find(tx, download.version_id).unwrap().crate_id;
 
         // Update the total number of version downloads
-        try!(tx.execute("UPDATE versions
+        tx.execute("UPDATE versions
                          SET downloads = downloads + $1
                          WHERE id = $2",
-                        &[&amt, &download.version_id]));
+                   &[&amt, &download.version_id])?;
         // Update the total number of crate downloads
-        try!(tx.execute("UPDATE crates SET downloads = downloads + $1
-                         WHERE id = $2", &[&amt, &crate_id]));
+        tx.execute("UPDATE crates SET downloads = downloads + $1
+                         WHERE id = $2", &[&amt, &crate_id])?;
 
         // Update the total number of crate downloads for today
-        let cnt = try!(tx.execute("UPDATE crate_downloads
+        let cnt = tx.execute("UPDATE crate_downloads
                                    SET downloads = downloads + $2
                                    WHERE crate_id = $1 AND date = date($3)",
-                                  &[&crate_id, &amt, &download.date]));
+                             &[&crate_id, &amt, &download.date])?;
         if cnt == 0 {
-            try!(tx.execute("INSERT INTO crate_downloads
+            tx.execute("INSERT INTO crate_downloads
                              (crate_id, downloads, date)
                              VALUES ($1, $2, $3)",
-                            &[&crate_id, &amt, &download.date]));
+                       &[&crate_id, &amt, &download.date])?;
         }
     }
 
     // After everything else is done, update the global counter of total
     // downloads.
-    try!(tx.execute("UPDATE metadata SET total_downloads = total_downloads + $1",
-                    &[&total]));
+    tx.execute("UPDATE metadata SET total_downloads = total_downloads + $1",
+               &[&total])?;
 
     Ok(Some(max))
 }

src/category.rs

@@ -45,19 +45,19 @@ pub struct EncodableCategoryWithSubcategories {
 impl Category {
     pub fn find_by_category(conn: &GenericConnection, name: &str)
                             -> CargoResult<Category> {
-        let stmt = try!(conn.prepare("SELECT * FROM categories \
-                                      WHERE category = $1"));
-        let rows = try!(stmt.query(&[&name]));
+        let stmt = conn.prepare("SELECT * FROM categories \
+                                      WHERE category = $1")?;
+        let rows = stmt.query(&[&name])?;
         rows.iter().next()
                    .chain_error(|| NotFound)
                    .map(|row| Model::from_row(&row))
     }
 
     pub fn find_by_slug(conn: &GenericConnection, slug: &str)
                             -> CargoResult<Category> {
-        let stmt = try!(conn.prepare("SELECT * FROM categories \
-                                      WHERE slug = LOWER($1)"));
-        let rows = try!(stmt.query(&[&slug]));
+        let stmt = conn.prepare("SELECT * FROM categories \
+                                      WHERE slug = LOWER($1)")?;
+        let rows = stmt.query(&[&slug])?;
         rows.iter().next()
                    .chain_error(|| NotFound)
                    .map(|row| Model::from_row(&row))
@@ -80,7 +80,7 @@ impl Category {
     pub fn update_crate(conn: &GenericConnection,
                         krate: &Crate,
                         categories: &[String]) -> CargoResult<Vec<String>> {
-        let old_categories = try!(krate.categories(conn));
+        let old_categories = krate.categories(conn)?;
         let old_categories_ids: HashSet<_> = old_categories.iter().map(|cat| {
             cat.id
         }).collect();
@@ -112,21 +112,21 @@ impl Category {
                                 .collect();
 
         if !to_rm.is_empty() {
-            try!(conn.execute("DELETE FROM crates_categories \
+            conn.execute("DELETE FROM crates_categories \
                                 WHERE category_id = ANY($1) \
                                   AND crate_id = $2",
-                              &[&to_rm, &krate.id]));
+                         &[&to_rm, &krate.id])?;
         }
 
         if !to_add.is_empty() {
             let insert: Vec<_> = to_add.into_iter().map(|id| {
                 format!("({}, {})", krate.id, id)
             }).collect();
             let insert = insert.join(", ");
-            try!(conn.execute(&format!("INSERT INTO crates_categories \
+            conn.execute(&format!("INSERT INTO crates_categories \
                                         (crate_id, category_id) VALUES {}",
-                                       insert),
-                              &[]));
+                                  insert),
+                         &[])?;
         }
 
         Ok(invalid_categories)
@@ -139,8 +139,8 @@ impl Category {
             WHERE category NOT LIKE '%::%'",
             Model::table_name(None::<Self>
         ));
-        let stmt = try!(conn.prepare(&sql));
-        let rows = try!(stmt.query(&[]));
+        let stmt = conn.prepare(&sql)?;
+        let rows = stmt.query(&[])?;
         Ok(rows.iter().next().unwrap().get("count"))
     }
 
@@ -156,7 +156,7 @@ impl Category {
 
         // Collect all the top-level categories and sum up the crates_cnt of
         // the crates in all subcategories
-        let stmt = try!(conn.prepare(&format!(
+        let stmt = conn.prepare(&format!(
             "SELECT c.id, c.category, c.slug, c.description, c.created_at, \
                 COALESCE (( \
                     SELECT sum(c2.crates_cnt)::int \
@@ -167,10 +167,10 @@ impl Category {
              FROM categories as c \
              WHERE c.category NOT LIKE '%::%' {} \
              LIMIT $1 OFFSET $2",
-             sort_sql
-        )));
+            sort_sql
+        ))?;
 
-        let categories: Vec<_> = try!(stmt.query(&[&limit, &offset]))
+        let categories: Vec<_> = stmt.query(&[&limit, &offset])?
             .iter()
             .map(|row| Model::from_row(&row))
             .collect();
@@ -180,7 +180,7 @@ impl Category {
 
     pub fn subcategories(&self, conn: &GenericConnection)
                                 -> CargoResult<Vec<Category>> {
-        let stmt = try!(conn.prepare("\
+        let stmt = conn.prepare("\
             SELECT c.id, c.category, c.slug, c.description, c.created_at, \
             COALESCE (( \
                 SELECT sum(c2.crates_cnt)::int \
@@ -190,9 +190,9 @@ impl Category {
             ), 0) as crates_cnt \
             FROM categories as c \
             WHERE c.category ILIKE $1 || '::%' \
-            AND c.category NOT ILIKE $1 || '::%::%'"));
+            AND c.category NOT ILIKE $1 || '::%::%'")?;
 
-        let rows = try!(stmt.query(&[&self.category]));
+        let rows = stmt.query(&[&self.category])?;
         Ok(rows.iter().map(|r| Model::from_row(&r)).collect())
     }
 }
@@ -213,16 +213,16 @@ impl Model for Category {
 
 /// Handles the `GET /categories` route.
 pub fn index(req: &mut Request) -> CargoResult<Response> {
-    let conn = try!(req.tx());
-    let (offset, limit) = try!(req.pagination(10, 100));
+    let conn = req.tx()?;
+    let (offset, limit) = req.pagination(10, 100)?;
     let query = req.query();
     let sort = query.get("sort").map_or("alpha", String::as_str);
 
-    let categories = try!(Category::toplevel(conn, sort, limit, offset));
+    let categories = Category::toplevel(conn, sort, limit, offset)?;
     let categories = categories.into_iter().map(Category::encodable).collect();
 
     // Query for the total count of categories
-    let total = try!(Category::count_toplevel(conn));
+    let total = Category::count_toplevel(conn)?;
 
     #[derive(RustcEncodable)]
     struct R { categories: Vec<EncodableCategory>, meta: Meta }
@@ -238,9 +238,9 @@ pub fn index(req: &mut Request) -> CargoResult<Response> {
 /// Handles the `GET /categories/:category_id` route.
 pub fn show(req: &mut Request) -> CargoResult<Response> {
     let slug = &req.params()["category_id"];
-    let conn = try!(req.tx());
-    let cat = try!(Category::find_by_slug(&*conn, &slug));
-    let subcats = try!(cat.subcategories(&*conn)).into_iter().map(|s| {
+    let conn = req.tx()?;
+    let cat = Category::find_by_slug(&*conn, &slug)?;
+    let subcats = cat.subcategories(&*conn)?.into_iter().map(|s| {
         s.encodable()
     }).collect();
     let cat = cat.encodable();
@@ -261,10 +261,10 @@ pub fn show(req: &mut Request) -> CargoResult<Response> {
 
 /// Handles the `GET /category_slugs` route.
 pub fn slugs(req: &mut Request) -> CargoResult<Response> {
-    let conn = try!(req.tx());
-    let stmt = try!(conn.prepare("SELECT slug FROM categories \
-                                  ORDER BY slug"));
-    let rows = try!(stmt.query(&[]));
+    let conn = req.tx()?;
+    let stmt = conn.prepare("SELECT slug FROM categories \
+                                  ORDER BY slug")?;
+    let rows = stmt.query(&[])?;
 
     #[derive(RustcEncodable)]
     struct Slug { id: String, slug: String }

src/db.rs

@@ -58,7 +58,7 @@ pub fn tls_handshake() -> Box<TlsHandshake + Sync + Send> {
                          _domain: &str,
                          stream: Stream)
                          -> Result<Box<TlsStream>, Box<Error + Send + Sync>> {
-            let stream = try!(self.0.danger_connect_without_providing_domain_for_certificate_verification_and_server_name_indication(stream));
+            let stream = self.0.danger_connect_without_providing_domain_for_certificate_verification_and_server_name_indication(stream)?;
             Ok(Box::new(stream))
         }
     }
@@ -131,9 +131,9 @@ impl Transaction {
 
     pub fn conn(&self) -> CargoResult<&r2d2::PooledConnection<r2d2_postgres::PostgresConnectionManager>> {
         if !self.slot.filled() {
-            let conn = try!(self.app.database.get().map_err(|e| {
+            let conn = self.app.database.get().map_err(|e| {
                 internal(format!("failed to get a database connection: {}", e))
-            }));
+            })?;
             self.slot.fill(Box::new(conn));
         }
         Ok(&**self.slot.borrow().unwrap())
@@ -146,8 +146,8 @@ impl Transaction {
         // desired effect.
         unsafe {
             if !self.tx.filled() {
-                let conn = try!(self.conn());
-                let t = try!(conn.transaction());
+                let conn = self.conn()?;
+                let t = conn.transaction()?;
                 let t = mem::transmute::<_, pg::transaction::Transaction<'static>>(t);
                 self.tx.fill(t);
             }
@@ -183,9 +183,9 @@ impl Middleware for TransactionMiddleware {
             if res.is_ok() && tx.commit.get() == Some(true) {
                 transaction.set_commit();
             }
-            try!(transaction.finish().map_err(|e| {
-                Box::new(e) as Box<Error+Send>
-            }));
+            transaction.finish().map_err(|e| {
+                Box::new(e) as Box<Error + Send>
+            })?;
         }
         return res
     }

src/dependency.rs

@@ -51,14 +51,14 @@ impl Dependency {
                   -> CargoResult<Dependency> {
         let req = req.to_string();
         let features = features.join(",");
-        let stmt = try!(conn.prepare("INSERT INTO dependencies
+        let stmt = conn.prepare("INSERT INTO dependencies
                                       (version_id, crate_id, req, optional,
                                        default_features, features, target, kind)
                                       VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
-                                      RETURNING *"));
-        let rows = try!(stmt.query(&[&version_id, &crate_id, &req,
-                                      &optional, &default_features,
-                                      &features, target, &(kind as i32)]));
+                                      RETURNING *")?;
+        let rows = stmt.query(&[&version_id, &crate_id, &req,
+            &optional, &default_features,
+            &features, target, &(kind as i32)])?;
         Ok(Model::from_row(&rows.iter().next().unwrap()))
     }