more things

amqp_core/src/connection.rs

@@ -53,17 +53,18 @@ pub struct ConnectionInner {
     pub global_data: GlobalData,
     pub channels: Mutex<HashMap<ChannelNum, Channel>>,
     pub exclusive_queues: Vec<Queue>,
-    _events: ConEventSender,
+    pub event_sender: ConEventSender,
 }
 
 #[derive(Debug)]
-pub enum QueuedMethod {
-    Normal(Method),
-    WithContent(Method, ContentHeader, SmallVec<[Bytes; 1]>),
+pub enum ConnectionEvent {
+    Shutdown,
+    Method(ChannelNum, Box<Method>),
+    MethodContent(ChannelNum, Box<Method>, ContentHeader, SmallVec<[Bytes; 1]>),
 }
 
-pub type ConEventSender = mpsc::Sender<(ChannelNum, QueuedMethod)>;
-pub type ConEventReceiver = mpsc::Receiver<(ChannelNum, QueuedMethod)>;
+pub type ConEventSender = mpsc::Sender<ConnectionEvent>;
+pub type ConEventReceiver = mpsc::Receiver<ConnectionEvent>;
 
 impl ConnectionInner {
     #[must_use]
@@ -71,7 +72,7 @@ impl ConnectionInner {
         id: ConnectionId,
         peer_addr: SocketAddr,
         global_data: GlobalData,
-        method_queue: ConEventSender,
+        event_sender: ConEventSender,
     ) -> Connection {
         Arc::new(Self {
             id,
@@ -79,7 +80,7 @@ impl ConnectionInner {
             global_data,
             channels: Mutex::new(HashMap::new()),
             exclusive_queues: vec![],
-            _events: method_queue,
+            event_sender,
         })
     }
 
@@ -97,7 +98,7 @@ pub struct ChannelInner {
     pub num: ChannelNum,
     pub connection: Connection,
     pub global_data: GlobalData,
-    method_queue: ConEventSender,
+    pub event_sender: ConEventSender,
 }
 
 impl ChannelInner {
@@ -114,7 +115,7 @@ impl ChannelInner {
             num,
             connection,
             global_data,
-            method_queue,
+            event_sender: method_queue,
         })
     }
 
@@ -122,13 +123,6 @@ impl ChannelInner {
         let mut global_data = self.global_data.lock();
         global_data.channels.remove(&self.id);
     }
-
-    pub fn queue_method(&self, method: QueuedMethod) {
-        // todo: this is a horrible hack around the lock chaos
-        self.method_queue
-            .try_send((self.num, method))
-            .expect("could not send method to channel, RIP");
-    }
 }
 
 /// A content frame header.

amqp_messaging/src/methods/publish.rs

@@ -1,7 +1,7 @@
 use crate::Result;
 use amqp_core::{
     amqp_todo,
-    connection::{Channel, QueuedMethod},
+    connection::{Channel, ConnectionEvent},
     error::ChannelException,
     message::Message,
     methods::{BasicPublish, Method},
@@ -31,19 +31,24 @@ pub async fn publish(channel_handle: Channel, message: Message) -> Result<()> {
         // consuming is hard, but this should work *for now*
         let consumers = queue.consumers.lock();
         if let Some(consumer) = consumers.first() {
-            let method = Method::BasicPublish(BasicPublish {
+            let method = Box::new(Method::BasicPublish(BasicPublish {
                 reserved_1: 0,
                 exchange: routing.exchange.clone(),
                 routing_key: routing.routing_key.clone(),
                 mandatory: false,
                 immediate: false,
-            });
+            }));
 
-            consumer.channel.queue_method(QueuedMethod::WithContent(
+            consumer
+                .channel
+                .event_sender
+                .try_send(ConnectionEvent::MethodContent(
+                    consumer.channel.num,
                     method,
                     message.header.clone(),
                     message.content.clone(),
-            ));
+                ))
+                .unwrap();
         }
     }
 

amqp_transport/src/connection.rs

@@ -8,17 +8,17 @@ use amqp_core::{
     amqp_todo,
     connection::{
         Channel, ChannelInner, ChannelNum, ConEventReceiver, ConEventSender, Connection,
-        ConnectionId, ContentHeader, QueuedMethod,
+        ConnectionEvent, ConnectionId, ContentHeader,
     },
     message::{MessageId, RawMessage, RoutingInformation},
     methods::{
         BasicPublish, ChannelClose, ChannelCloseOk, ChannelOpenOk, ConnectionClose,
         ConnectionCloseOk, ConnectionOpen, ConnectionOpenOk, ConnectionStart, ConnectionStartOk,
-        ConnectionTune, ConnectionTuneOk, FieldValue, Method, Table,
+        ConnectionTune, ConnectionTuneOk, FieldValue, Method, ReplyCode, ReplyText, Table,
     },
     GlobalData,
 };
-use anyhow::Context;
+use anyhow::{anyhow, Context};
 use bytes::Bytes;
 use smallvec::SmallVec;
 use std::{
@@ -64,9 +64,10 @@ pub struct TransportConnection {
     channels: HashMap<ChannelNum, TransportChannel>,
     global_con: Connection,
     global_data: GlobalData,
-
-    method_queue_send: ConEventSender,
-    method_queue_recv: ConEventReceiver,
+    /// Only here to forward to other futures so they can send events
+    event_sender: ConEventSender,
+    /// To receive events from other futures
+    event_receiver: ConEventReceiver,
 }
 
 const DEFAULT_TIMEOUT: Duration = Duration::from_secs(30);
@@ -102,8 +103,8 @@ impl TransportConnection {
             global_con,
             channels: HashMap::with_capacity(4),
             global_data,
-            method_queue_send,
-            method_queue_recv,
+            event_sender: method_queue_send,
+            event_receiver: method_queue_recv,
         }
     }
 
@@ -117,27 +118,12 @@ impl TransportConnection {
             }
             Err(TransError::Protocol(ProtocolError::ConException(ex))) => {
                 warn!(%ex, "Connection exception occurred. This indicates a faulty client.");
-                if let Err(err) = self
-                    .send_method(
-                        ChannelNum::zero(),
-                        Method::ConnectionClose(ConnectionClose {
-                            reply_code: ex.reply_code(),
-                            reply_text: ex.reply_text(),
-                            class_id: 0, // todo: do this
-                            method_id: 0,
-                        }),
-                    )
-                    .await
-                {
-                    error!(%ex, %err, "Failed to close connection after ConnectionException");
-                }
-                match self.recv_method().await {
-                    Ok(Method::ConnectionCloseOk(_)) => {}
-                    Ok(method) => {
-                        error!(%ex, ?method, "Received wrong method after ConnectionException")
-                    }
+                let close_result = self.close(ex.reply_code(), ex.reply_text()).await;
+
+                match close_result {
+                    Ok(()) => {}
                     Err(err) => {
-                        error!(%ex, %err, "Failed to receive Connection.CloseOk method after ConnectionException")
+                        error!(%ex, %err, "Failed to close connection after ConnectionException");
                     }
                 }
             }
@@ -161,7 +147,7 @@ impl TransportConnection {
     async fn send_method_content(
         &mut self,
         channel: ChannelNum,
-        method: Method,
+        method: &Method,
         _header: ContentHeader,
         _body: SmallVec<[Bytes; 1]>,
     ) -> Result<()> {
@@ -169,7 +155,7 @@ impl TransportConnection {
         amqp_todo!()
     }
 
-    async fn send_method(&mut self, channel: ChannelNum, method: Method) -> Result<()> {
+    async fn send_method(&mut self, channel: ChannelNum, method: &Method) -> Result<()> {
         trace!(%channel, ?method, "Sending method");
 
         let mut payload = Vec::with_capacity(64);
@@ -208,7 +194,7 @@ impl TransportConnection {
         });
 
         debug!(?start_method, "Sending Start method");
-        self.send_method(ChannelNum::zero(), start_method).await?;
+        self.send_method(ChannelNum::zero(), &start_method).await?;
 
         let start_ok = self.recv_method().await?;
         debug!(?start_ok, "Received Start-Ok");
@@ -239,7 +225,7 @@ impl TransportConnection {
         });
 
         debug!("Sending Tune method");
-        self.send_method(ChannelNum::zero(), tune_method).await?;
+        self.send_method(ChannelNum::zero(), &tune_method).await?;
 
         let tune_ok = self.recv_method().await?;
         debug!(?tune_ok, "Received Tune-Ok method");
@@ -269,8 +255,8 @@ impl TransportConnection {
 
         self.send_method(
             ChannelNum::zero(),
-            Method::ConnectionOpenOk(ConnectionOpenOk {
-                reserved_1: "".to_string(),
+            &Method::ConnectionOpenOk(ConnectionOpenOk {
+                reserved_1: "".to_owned(),
             }),
         )
         .await?;
@@ -285,10 +271,11 @@ impl TransportConnection {
                     let frame = frame?;
                     self.handle_frame(frame).await?;
                 }
-                queued_method = self.method_queue_recv.recv() => {
+                queued_method = self.event_receiver.recv() => {
                     match queued_method {
-                        Some((channel, QueuedMethod::Normal(method))) => self.send_method(channel, method).await?,
-                        Some((channel, QueuedMethod::WithContent(method, header, body))) => self.send_method_content(channel, method, header, body).await?,
+                        Some(ConnectionEvent::Method(channel, method)) => self.send_method(channel, &method).await?,
+                        Some(ConnectionEvent::MethodContent(channel, method, header, body)) => self.send_method_content(channel, &method, header, body).await?,
+                        Some(ConnectionEvent::Shutdown) => return self.close(0, "".to_owned()).await,
                         None => {}
                     }
                 }
@@ -315,7 +302,7 @@ impl TransportConnection {
                 warn!(%ex, "Channel exception occurred");
                 self.send_method(
                     channel,
-                    Method::ChannelClose(ChannelClose {
+                    &Method::ChannelClose(ChannelClose {
                         reply_code: ex.reply_code(),
                         reply_text: ex.reply_text(),
                         class_id: 0, // todo: do this
@@ -349,7 +336,7 @@ impl TransportConnection {
                 info!(%reply_code, %reply_text, %class_id, %method_id, "Closing connection");
                 self.send_method(
                     ChannelNum::zero(),
-                    Method::ConnectionCloseOk(ConnectionCloseOk),
+                    &Method::ConnectionCloseOk(ConnectionCloseOk),
                 )
                 .await?;
                 return Err(ProtocolError::GracefullyClosed.into());
@@ -375,7 +362,7 @@ impl TransportConnection {
                 // maybe this might become an `Option` in the future
                 let return_method =
                     amqp_messaging::methods::handle_method(channel_handle, method).await?;
-                self.send_method(frame.channel, return_method).await?;
+                self.send_method(frame.channel, &return_method).await?;
             }
         }
         Ok(())
@@ -489,7 +476,7 @@ impl TransportConnection {
             channel_num,
             self.global_con.clone(),
             self.global_data.clone(),
-            self.method_queue_send.clone(),
+            self.event_sender.clone(),
         );
 
         let channel = TransportChannel {
@@ -519,7 +506,7 @@ impl TransportConnection {
 
         self.send_method(
             channel_num,
-            Method::ChannelOpenOk(ChannelOpenOk {
+            &Method::ChannelOpenOk(ChannelOpenOk {
                 reserved_1: Vec::new(),
             }),
         )
@@ -539,7 +526,7 @@ impl TransportConnection {
 
             if let Some(channel) = self.channels.remove(&channel_id) {
                 drop(channel);
-                self.send_method(channel_id, Method::ChannelCloseOk(ChannelCloseOk))
+                self.send_method(channel_id, &Method::ChannelCloseOk(ChannelCloseOk))
                     .await?;
             } else {
                 return Err(ConException::Todo.into());
@@ -598,6 +585,33 @@ impl TransportConnection {
             Err(ProtocolError::ProtocolNegotiationFailed.into())
         }
     }
+
+    async fn close(&mut self, reply_code: ReplyCode, reply_text: ReplyText) -> Result<()> {
+        self.send_method(
+            ChannelNum::zero(),
+            &Method::ConnectionClose(ConnectionClose {
+                reply_code,
+                reply_text,
+                class_id: 0, // todo: do this
+                method_id: 0,
+            }),
+        )
+        .await?;
+
+        match self.recv_method().await {
+            Ok(Method::ConnectionCloseOk(_)) => Ok(()),
+            Ok(method) => {
+                return Err(TransError::Other(anyhow!(
+                    "Received wrong method after closing, method: {method:?}"
+                )));
+            }
+            Err(err) => {
+                return Err(TransError::Other(anyhow!(
+                    "Failed to receive Connection.CloseOk method after closing, err: {err}"
+                )));
+            }
+        }
+    }
 }
 
 impl Drop for TransportConnection {
@@ -619,12 +633,12 @@ fn server_properties(host: SocketAddr) -> Table {
 
     let host_str = host.ip().to_string();
     HashMap::from([
-        ("host".to_string(), ls(&host_str)),
-        ("product".to_string(), ls("no name yet")),
-        ("version".to_string(), ls("0.1.0")),
-        ("platform".to_string(), ls("microsoft linux")),
-        ("copyright".to_string(), ls("MIT")),
-        ("information".to_string(), ls("hello reader")),
-        ("uwu".to_string(), ls("owo")),
+        ("host".to_owned(), ls(&host_str)),
+        ("product".to_owned(), ls("no name yet")),
+        ("version".to_owned(), ls("0.1.0")),
+        ("platform".to_owned(), ls("microsoft linux")),
+        ("copyright".to_owned(), ls("MIT")),
+        ("information".to_owned(), ls("hello reader")),
+        ("uwu".to_owned(), ls("owo")),
     ])
 }

amqp_transport/src/frame.rs

@@ -119,10 +119,10 @@ pub fn parse_content_header(input: &[u8]) -> Result<ContentHeader> {
     match content_header_parse::header(input) {
         Ok(([], header)) => Ok(header),
         Ok((_, _)) => {
-            Err(ConException::SyntaxError(vec!["could not consume all input".to_string()]).into())
+            Err(ConException::SyntaxError(vec!["could not consume all input".to_owned()]).into())
         }
         Err(nom::Err::Incomplete(_)) => {
-            Err(ConException::SyntaxError(vec!["there was not enough data".to_string()]).into())
+            Err(ConException::SyntaxError(vec!["there was not enough data".to_owned()]).into())
         }
         Err(nom::Err::Failure(err) | nom::Err::Error(err)) => Err(err),
     }

amqp_transport/src/methods/generated.rs

@@ -890,7 +890,7 @@ pub mod write {
     use amqp_core::methods::*;
     use std::io::Write;
 
-    pub fn write_method<W: Write>(method: Method, mut writer: W) -> Result<(), TransError> {
+    pub fn write_method<W: Write>(method: &Method, mut writer: W) -> Result<(), TransError> {
         match method {
             Method::ConnectionStart(ConnectionStart {
                 version_major,

amqp_transport/src/methods/mod.rs

@@ -20,10 +20,10 @@ pub fn parse_method(payload: &[u8]) -> Result<Method, TransError> {
     match nom_result {
         Ok(([], method)) => Ok(method),
         Ok((_, _)) => {
-            Err(ConException::SyntaxError(vec!["could not consume all input".to_string()]).into())
+            Err(ConException::SyntaxError(vec!["could not consume all input".to_owned()]).into())
         }
         Err(nom::Err::Incomplete(_)) => {
-            Err(ConException::SyntaxError(vec!["there was not enough data".to_string()]).into())
+            Err(ConException::SyntaxError(vec!["there was not enough data".to_owned()]).into())
         }
         Err(nom::Err::Failure(err) | nom::Err::Error(err)) => Err(err),
     }

amqp_transport/src/methods/tests.rs

@@ -67,11 +67,8 @@ fn random_ser_de() {
 #[test]
 fn nested_table() {
     let table = HashMap::from([(
-        "A".to_string(),
-        FieldValue::FieldTable(HashMap::from([(
-            "B".to_string(),
-            FieldValue::Boolean(true),
-        )])),
+        "A".to_owned(),
+        FieldValue::FieldTable(HashMap::from([("B".to_owned(), FieldValue::Boolean(true))])),
     )]);
     eprintln!("{table:?}");
 

amqp_transport/src/methods/write_helper.rs

@@ -3,27 +3,27 @@ use amqp_core::methods::{Bit, Long, Longlong, Longstr, Octet, Short, Shortstr, T
 use anyhow::Context;
 use std::io::Write;
 
-pub fn octet<W: Write>(value: Octet, writer: &mut W) -> Result<(), TransError> {
-    writer.write_all(&[value])?;
+pub fn octet<W: Write>(value: &Octet, writer: &mut W) -> Result<(), TransError> {
+    writer.write_all(&[*value])?;
     Ok(())
 }
 
-pub fn short<W: Write>(value: Short, writer: &mut W) -> Result<(), TransError> {
+pub fn short<W: Write>(value: &Short, writer: &mut W) -> Result<(), TransError> {
     writer.write_all(&value.to_be_bytes())?;
     Ok(())
 }
 
-pub fn long<W: Write>(value: Long, writer: &mut W) -> Result<(), TransError> {
+pub fn long<W: Write>(value: &Long, writer: &mut W) -> Result<(), TransError> {
     writer.write_all(&value.to_be_bytes())?;
     Ok(())
 }
 
-pub fn longlong<W: Write>(value: Longlong, writer: &mut W) -> Result<(), TransError> {
+pub fn longlong<W: Write>(value: &Longlong, writer: &mut W) -> Result<(), TransError> {
     writer.write_all(&value.to_be_bytes())?;
     Ok(())
 }
 
-pub fn bit<W: Write>(value: &[Bit], writer: &mut W) -> Result<(), TransError> {
+pub fn bit<W: Write>(value: &[&Bit], writer: &mut W) -> Result<(), TransError> {
     // accumulate bits into bytes, starting from the least significant bit in each byte
 
     // how many bits have already been packed into `current_buf`
@@ -37,7 +37,7 @@ pub fn bit<W: Write>(value: &[Bit], writer: &mut W) -> Result<(), TransError> {
             already_filled = 0;
         }
 
-        let new_bit = (u8::from(bit)) << already_filled;
+        let new_bit = (u8::from(*bit)) << already_filled;
         current_buf |= new_bit;
         already_filled += 1;
     }
@@ -49,7 +49,7 @@ pub fn bit<W: Write>(value: &[Bit], writer: &mut W) -> Result<(), TransError> {
     Ok(())
 }
 
-pub fn shortstr<W: Write>(value: Shortstr, writer: &mut W) -> Result<(), TransError> {
+pub fn shortstr<W: Write>(value: &Shortstr, writer: &mut W) -> Result<(), TransError> {
     let len = u8::try_from(value.len()).context("shortstr too long")?;
     writer.write_all(&[len])?;
     writer.write_all(value.as_bytes())?;
@@ -57,7 +57,7 @@ pub fn shortstr<W: Write>(value: Shortstr, writer: &mut W) -> Result<(), TransEr
     Ok(())
 }
 
-pub fn longstr<W: Write>(value: Longstr, writer: &mut W) -> Result<(), TransError> {
+pub fn longstr<W: Write>(value: &Longstr, writer: &mut W) -> Result<(), TransError> {
     let len = u32::try_from(value.len()).context("longstr too long")?;
     writer.write_all(&len.to_be_bytes())?;
     writer.write_all(value.as_slice())?;
@@ -67,12 +67,12 @@ pub fn longstr<W: Write>(value: Longstr, writer: &mut W) -> Result<(), TransErro
 
 // this appears to be unused right now, but it could be used in `Basic` things?
 #[allow(dead_code)]
-pub fn timestamp<W: Write>(value: Timestamp, writer: &mut W) -> Result<(), TransError> {
+pub fn timestamp<W: Write>(value: &Timestamp, writer: &mut W) -> Result<(), TransError> {
     writer.write_all(&value.to_be_bytes())?;
     Ok(())
 }
 
-pub fn table<W: Write>(table: Table, writer: &mut W) -> Result<(), TransError> {
+pub fn table<W: Write>(table: &Table, writer: &mut W) -> Result<(), TransError> {
     let mut table_buf = Vec::new();
 
     for (field_name, value) in table {
@@ -87,17 +87,17 @@ pub fn table<W: Write>(table: Table, writer: &mut W) -> Result<(), TransError> {
     Ok(())
 }
 
-fn field_value<W: Write>(value: FieldValue, writer: &mut W) -> Result<(), TransError> {
+fn field_value<W: Write>(value: &FieldValue, writer: &mut W) -> Result<(), TransError> {
     match value {
         FieldValue::Boolean(bool) => {
-            writer.write_all(&[b't', u8::from(bool)])?;
+            writer.write_all(&[b't', u8::from(*bool)])?;
         }
         FieldValue::ShortShortInt(int) => {
             writer.write_all(b"b")?;
             writer.write_all(&int.to_be_bytes())?;
         }
         FieldValue::ShortShortUInt(int) => {
-            writer.write_all(&[b'B', int])?;
+            writer.write_all(&[b'B', *int])?;
         }
         FieldValue::ShortInt(int) => {
             writer.write_all(b"U")?;
@@ -132,7 +132,7 @@ fn field_value<W: Write>(value: FieldValue, writer: &mut W) -> Result<(), TransE
             writer.write_all(&float.to_be_bytes())?;
         }
         FieldValue::DecimalValue(scale, long) => {
-            writer.write_all(&[b'D', scale])?;
+            writer.write_all(&[b'D', *scale])?;
             writer.write_all(&long.to_be_bytes())?;
         }
         FieldValue::ShortString(str) => {
@@ -174,7 +174,7 @@ mod tests {
         let bits = [true, false, true];
 
         let mut buffer = [0u8; 1];
-        super::bit(&bits, &mut buffer.as_mut_slice()).unwrap();
+        super::bit(&bits.map(|b| &b), &mut buffer.as_mut_slice()).unwrap();
 
         assert_eq!(buffer, [0b00000101])
     }
@@ -188,7 +188,7 @@ mod tests {
         ];
 
         let mut buffer = [0u8; 2];
-        super::bit(&bits, &mut buffer.as_mut_slice()).unwrap();
+        super::bit(&bits.map(|b| &b), &mut buffer.as_mut_slice()).unwrap();
 
         assert_eq!(buffer, [0b00001111, 0b00001101]);
     }

amqp_transport/src/tests.rs

@@ -12,7 +12,7 @@ async fn write_start_ok_frame() {
         version_major: 0,
         version_minor: 9,
         server_properties: HashMap::from([(
-            "product".to_string(),
+            "product".to_owned(),
             FieldValue::LongString("no name yet".into()),
         )]),
         mechanisms: "PLAIN".into(),
@@ -145,41 +145,38 @@ fn read_start_ok_payload() {
         Method::ConnectionStartOk(ConnectionStartOk {
             client_properties: HashMap::from([
                 (
-                    "product".to_string(),
+                    "product".to_owned(),
                     FieldValue::LongString("Pika Python Client Library".into())
                 ),
                 (
-                    "platform".to_string(),
+                    "platform".to_owned(),
                     FieldValue::LongString("Python 3.8.10".into())
                 ),
                 (
-                    "capabilities".to_string(),
+                    "capabilities".to_owned(),
                     FieldValue::FieldTable(HashMap::from([
                         (
-                            "authentication_failure_close".to_string(),
+                            "authentication_failure_close".to_owned(),
                             FieldValue::Boolean(true)
                         ),
-                        ("basic.nack".to_string(), FieldValue::Boolean(true)),
-                        ("connection.blocked".to_string(), FieldValue::Boolean(true)),
+                        ("basic.nack".to_owned(), FieldValue::Boolean(true)),
+                        ("connection.blocked".to_owned(), FieldValue::Boolean(true)),
                         (
-                            "consumer_cancel_notify".to_string(),
+                            "consumer_cancel_notify".to_owned(),
                             FieldValue::Boolean(true)
                         ),
-                        ("publisher_confirms".to_string(), FieldValue::Boolean(true)),
+                        ("publisher_confirms".to_owned(), FieldValue::Boolean(true)),
                     ]))
                 ),
                 (
-                    "information".to_string(),
+                    "information".to_owned(),
                     FieldValue::LongString("See http://pika.rtfd.org".into())
                 ),
-                (
-                    "version".to_string(),
-                    FieldValue::LongString("1.1.0".into())
-                )
+                ("version".to_owned(), FieldValue::LongString("1.1.0".into()))
             ]),
-            mechanism: "PLAIN".to_string(),
+            mechanism: "PLAIN".to_owned(),
             response: "\x00admin\x00".into(),
-            locale: "en_US".to_string()
+            locale: "en_US".to_owned()
         })
     );
 }

xtask/src/codegen/mod.rs

@@ -305,7 +305,7 @@ pub struct {class_name}{method_name}"
         use heck::ToSnakeCase;
 
         if ident == "type" {
-            "r#type".to_string()
+            "r#type".to_owned()
         } else {
             ident.to_snake_case()
         }
@@ -336,7 +336,7 @@ pub struct {class_name}{method_name}"
     fn invariants<'a>(&self, asserts: impl Iterator<Item = &'a Assert>) -> String {
         asserts
             .map(|assert| match &*assert.check {
-                "notnull" => "must not be null".to_string(),
+                "notnull" => "must not be null".to_owned(),
                 "length" => format!("must be shorter than {}", assert.value.as_ref().unwrap()),
                 "regexp" => format!("must match `{}`", assert.value.as_ref().unwrap()),
                 "le" => {
@@ -354,7 +354,7 @@ pub struct {class_name}{method_name}"
 
     fn doc_comment(&mut self, docs: &[Doc], indent: usize) {
         for doc in docs {
-            if doc.kind == Some("grammar".to_string()) {
+            if doc.kind == Some("grammar".to_owned()) {
                 continue;
             }
             for line in doc.text.lines() {

xtask/src/codegen/write.rs

@@ -11,7 +11,7 @@ use crate::error::TransError;
 use crate::methods::write_helper::*;
 use std::io::Write;
 
-pub fn write_method<W: Write>(method: Method, mut writer: W) -> Result<(), TransError> {{
+pub fn write_method<W: Write>(method: &Method, mut writer: W) -> Result<(), TransError> {{
     match method {{"
         )
         .ok();