Fix update_listeners

examples/ping_pong_bot/src/main.rs

@@ -3,6 +3,7 @@ use teloxide::prelude::*;
 #[tokio::main]
 async fn main() {
     std::env::set_var("RUST_LOG", "ping_pong_bot=trace");
+    std::env::set_var("RUST_LOG", "teloxide=error");
     pretty_env_logger::init();
     log::info!("Starting the ping-pong bot!");
 

examples/simple_dialogue/src/main.rs

@@ -152,6 +152,7 @@ async fn handle_message(ctx: Ctx) -> Res {
 #[tokio::main]
 async fn main() {
     std::env::set_var("RUST_LOG", "simple_dialogue=trace");
+    std::env::set_var("RUST_LOG", "teloxide=error");
     pretty_env_logger::init();
     log::info!("Starting the simple_dialogue bot!");
 

src/dispatching/update_listeners.rs

@@ -155,13 +155,30 @@ pub fn polling(
             let updates = match req.send().await {
                 Err(err) => vec![Err(err)],
                 Ok(updates) => {
+                    // Set offset to the last update's id + 1
+                    if let Some(upd) = updates.last() {
+                        let id: i32 = match upd {
+                            Ok(ok) => ok.id,
+                            Err((value, _)) => value["update_id"]
+                                .as_i64()
+                                .expect(
+                                    "The 'update_id' field must always exist in \
+                                     Update",
+                                )
+                                .try_into()
+                                .expect("update_id must be i32"),
+                        };
+
+                        offset = id + 1;
+                    }
+
                     let updates = updates
                         .into_iter()
                         .filter(|update| match update {
-                            Err(error) => {
-                                log::error!("Cannot parse an update: {:?}! \
+                            Err((value, error)) => {
+                                log::error!("Cannot parse an update.\nError: {:?}\nValue: {}\n\
                         This is a bug in teloxide, please open an issue here: \
-                        https://github.com/teloxide/teloxide/issues.", error);
+                        https://github.com/teloxide/teloxide/issues.", error, value);
                                 false
                             }
                             Ok(_) => true,
@@ -171,9 +188,6 @@ pub fn polling(
                         })
                         .collect::<Vec<Update>>();
 
-                    if let Some(upd) = updates.last() {
-                        offset = upd.id + 1;
-                    }
                     updates.into_iter().map(Ok).collect::<Vec<_>>()
                 }
             };

src/requests/all/get_updates.rs

@@ -32,12 +32,14 @@ pub struct GetUpdates {
 
 #[async_trait::async_trait]
 impl Request for GetUpdates {
-    type Output = Vec<serde_json::Result<Update>>;
+    type Output = Vec<Result<Update, (Value, serde_json::Error)>>;
 
     /// Deserialize to `Vec<serde_json::Result<Update>>` instead of
     /// `Vec<Update>`, because we want to parse the rest of updates even if our
     /// library hasn't parsed one.
-    async fn send(&self) -> ResponseResult<Vec<serde_json::Result<Update>>> {
+    async fn send(
+        &self,
+    ) -> ResponseResult<Vec<Result<Update, (Value, serde_json::Error)>>> {
         let value: Value = net::request_json(
             self.bot.client(),
             self.bot.token(),
@@ -49,7 +51,10 @@ impl Request for GetUpdates {
         match value {
             Value::Array(array) => Ok(array
                 .into_iter()
-                .map(|value| serde_json::from_str(&value.to_string()))
+                .map(|value| {
+                    serde_json::from_str(&value.to_string())
+                        .map_err(|error| (value, error))
+                })
                 .collect()),
             _ => Err(RequestError::InvalidJson(
                 serde_json::from_value::<Vec<Update>>(value)