feat(ircv3): add client-batches feature

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

.forgejo/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  pull_request: {}
+  push:
+    branches:
+      - develop
+
+jobs:
+  test:
+    runs-on: nix
+    steps:
+    - uses: actions/checkout@v3
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo build --workspace --all-targets"
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo build --workspace --all-targets --no-default-features"
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo build --workspace --all-targets --features tls-native"
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo build --workspace --all-targets --features tls-rust"
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo test --workspace --all-targets"
+    # runs all documentation tests separately, since those are not picked up by
+    # `--all-targets`.
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo test --workspace --doc"
+
+  rustfmt:
+    runs-on: nix
+    steps:
+    - uses: actions/checkout@v3
+    - run: nix-shell -p rustfmt cargo --run "cargo fmt --all --check"

.github/workflows/ci.yml

@@ -1,41 +0,0 @@
-name: CI
-
-on:
-  pull_request: {}
-  push:
-    branches:
-      - develop
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        rust: ["1.71", stable]
-    steps:
-    - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@master
-      with:
-        toolchain: ${{matrix.rust}}
-    - run: cargo build --workspace --all-targets
-    - run: cargo build --workspace --all-targets --no-default-features
-    - run: cargo build --workspace --all-targets --features tls-native
-    - run: cargo build --workspace --all-targets --features tls-rust
-    # runs all tests for all targets, including examples and benchmarks. Only on
-    # stable, since we don't care about tests running on MSRV.
-    - run: cargo test --workspace --all-targets
-      if: matrix.rust == 'stable'
-    # runs all documentation tests separately, since those are not picked up by
-    # `--all-targets`.
-    - run: cargo test --workspace --doc
-      if: matrix.rust == 'stable'
-
-  rustfmt:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@stable
-      with:
-        components: rustfmt
-    - run: cargo fmt --all --check

Cargo.toml

@@ -24,9 +24,10 @@ members = [ "./", "irc-proto/" ]
 
 
 [features]
-default = ["ctcp", "tls-native", "channel-lists", "toml_config"]
+default = ["ctcp", "tls-native", "channel-lists", "batch", "toml_config"]
 ctcp = []
 channel-lists = []
+batch = []
 
 json_config = ["serde", "serde/derive", "serde_derive", "serde_json"]
 toml_config = ["serde", "serde/derive", "serde_derive", "toml"]
@@ -70,6 +71,7 @@ tokio-rustls = { version = "0.24.0", features = ["dangerous_configuration"], opt
 rustls-pemfile = { version = "1.0.2", optional = true }
 tokio-native-tls = { version = "0.3.1", optional = true }
 webpki-roots = { version = "0.23.0", optional = true }
+atomic-counter = "1.0.1"
 
 
 [dev-dependencies]

irc-proto/src/command.rs

@@ -5,6 +5,7 @@ use crate::chan::ChannelExt;
 use crate::error::MessageParseError;
 use crate::mode::{ChannelMode, Mode, UserMode};
 use crate::response::Response;
+use crate::standard_reply::{StandardTypes, StandardCodes};
 
 /// List of all client commands as defined in [RFC 2812](http://tools.ietf.org/html/rfc2812). This
 /// also includes commands from the
@@ -200,6 +201,9 @@ pub enum Command {
     // Default option.
     /// An IRC response code with arguments and optional suffix.
     Response(Response, Vec<String>),
+    /// https://ircv3.net/specs/extensions/standard-replies
+    /// [FAIL | WARN | NOTE] <command> <code> [<context>] <description>
+    StandardResponse(StandardTypes, String, StandardCodes, Vec<String>, String),
     /// A raw IRC command unknown to the crate.
     Raw(String, Vec<String>),
 }
@@ -408,6 +412,10 @@ impl<'a> From<&'a Command> for String {
                 &format!("{:03}", *resp as u16),
                 &a.iter().map(|s| &s[..]).collect::<Vec<_>>(),
             ),
+            Command::StandardResponse(ref r#type, ref command, ref code, ref args, ref description) => {
+                match r#type {
+                }
+            },
             Command::Raw(ref c, ref a) => {
                 stringify(c, &a.iter().map(|s| &s[..]).collect::<Vec<_>>())
             }
@@ -958,6 +966,14 @@ impl Command {
             } else {
                 raw(cmd, args)
             }
+        } else if StandardTypes::is_standard_type(cmd) {
+            let code = StandardCodes::from_message(args[0], args[1]);
+            let mut std_args: Vec<String> = args.iter().skip(2).map(|&s| s.to_owned()).collect();
+            let desc = std_args.pop().ok_or_else(|| MessageParseError::MissingDescriptionInStandardReply)?;
+
+            Command::StandardResponse(
+                StandardTypes::from_str(cmd).map_err(MessageParseError::InvalidStandardReplyType)?, 
+                args[0].to_owned(), code, std_args, desc)
         } else if let Ok(resp) = cmd.parse() {
             Command::Response(resp, args.into_iter().map(|s| s.to_owned()).collect())
         } else {
@@ -1128,6 +1144,7 @@ mod test {
     use super::Command;
     use super::Response;
     use crate::Message;
+    use crate::standard_reply::{StandardTypes, StandardCodes};
 
     #[test]
     fn format_response() {
@@ -1155,4 +1172,20 @@ mod test {
             cmd
         );
     }
+
+    #[test]
+    fn parse_standard_reply() {
+        let msg = "FAIL BOX BOXES_INVALID STACK CLOCKWISE :Given boxes are not supported".parse::<Message>().unwrap();
+
+        assert_eq!(
+            msg.command,
+            Command::StandardResponse(StandardTypes::Fail, "BOX".to_string(), StandardCodes::Custom("BOXES_INVALID".to_string()), vec!["STACK".to_string(), "CLOCKWISE".to_string()], "Given boxes are not supported".to_string())
+        );
+
+        let msg = "NOTE * OPER_MESSAGE :Registering new accounts and channels has been disabled temporarily while we deal with the spam. Thanks for flying ExampleNet! -dan".parse::<Message>().unwrap();
+        assert_eq!(
+            msg.command,
+            Command::StandardResponse(StandardTypes::Note, "*".to_string(), StandardCodes::Custom("OPER_MESSAGE".to_string()), vec![], "Registering new accounts and channels has been disabled temporarily while we deal with the spam. Thanks for flying ExampleNet! -dan".to_string())
+        );
+    }
 }

irc-proto/src/error.rs

@@ -58,6 +58,14 @@ pub enum MessageParseError {
         /// The invalid subcommand.
         sub: String,
     },
+
+    /// The standard reply missed a description
+    #[error("missing description in standard reply")]
+    MissingDescriptionInStandardReply,
+
+    /// Invalid standard reply type
+    #[error("invalid standard reply type: {}", .0)]
+    InvalidStandardReplyType(&'static str)
 }
 
 /// Errors that occur while parsing mode strings.

irc-proto/src/lib.rs

@@ -15,6 +15,7 @@ pub mod message;
 pub mod mode;
 pub mod prefix;
 pub mod response;
+pub mod standard_reply;
 
 pub use self::caps::{Capability, NegotiationVersion};
 pub use self::chan::ChannelExt;

irc-proto/src/standard_reply.rs

@@ -0,0 +1,286 @@
+use std::str::FromStr;
+
+/// Support for https://ircv3.net/specs/extensions/standard-replies
+/// Implements the list of reply codes in the IRCv3 registry: https://ircv3.net/registry
+
+trait FromCode {
+    fn from_code(code: &str) -> Option<Self> where Self: Sized;
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum MultilineCodes {
+    MaxBytes,
+    MaxLines,
+    InvalidTarget,
+    Invalid
+}
+
+impl FromCode for MultilineCodes {
+    fn from_code(code: &str) -> Option<Self> {
+        Some(match code {
+            "MULTILINE_MAX_BYTES" => Self::MaxBytes,
+            "MULTILINE_MAX_LINES" => Self::MaxLines,
+            "MULTILINE_INVALID_TARGET" => Self::InvalidTarget,
+            "MULTILINE_INVALID" => Self::Invalid,
+            _ => return None,
+        })
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ChatHistoryCodes {
+    InvalidParams,
+    InvalidTarget,
+    MessageError,
+    NeedMoreParams,
+    UnknownCommand
+}
+
+impl FromCode for ChatHistoryCodes {
+    fn from_code(code: &str) -> Option<Self> {
+        Some(match code {
+            "INVALID_PARAMS" => Self::InvalidParams,
+            "INVALID_TARGET" => Self::InvalidTarget,
+            "MESSAGE_ERROR" => Self::MessageError,
+            "NEED_MORE_PARAMS" => Self::NeedMoreParams,
+            "UNKNOWN_COMMAND" => Self::UnknownCommand,
+            _ => return None,
+        })
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum JoinCodes {
+    ChannelRenamed
+}
+
+impl FromCode for JoinCodes {
+    fn from_code(code: &str) -> Option<Self> {
+        Some(match code {
+            "CHANNEL_RENAMED" => Self::ChannelRenamed,
+            _ => return None
+        })
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum NickCodes {
+    Reserved
+}
+
+impl FromCode for NickCodes {
+    fn from_code(code: &str) -> Option<Self> {
+        Some(match code {
+            "NICKNAME_RESERVED" => Self::Reserved,
+            _ => return None
+        })
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum RedactCodes {
+    InvalidTarget,
+    Forbidden,
+    WindowExpired,
+    UnknownMsgid,
+}
+
+impl FromCode for RedactCodes {
+    fn from_code(code: &str) -> Option<Self> {
+        Some(match code {
+            "INVALID_TARGET" => Self::InvalidTarget,
+            "REACT_FORBIDDEN" => Self::Forbidden,
+            "REACT_WINDOW_EXPIRED" => Self::WindowExpired,
+            "UNKNOWN_MSGID" => Self::UnknownMsgid,
+            _ => return None
+        })
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum RegisterCodes {
+    AccountExists,
+    AccountNameMustBeNick,
+    AlreadyAuthenticated,
+    BadAccountName,
+    CompleteConnectionRequired,
+    InvalidEmail,
+    NeedNick,
+    TemporarilyUnavailable,
+    UnacceptableEmail,
+    UnacceptablePassword,
+    WeakPassword
+}
+
+impl FromCode for RegisterCodes {
+    fn from_code(code: &str) -> Option<Self> {
+        Some(match code {
+            "ACCOUNT_EXISTS" => Self::AccountExists,
+            "ACCOUNT_NAME_MUST_BE_NICK" => Self::AccountNameMustBeNick,
+            "ALREADY_AUTHENTICATED" => Self::AlreadyAuthenticated,
+            "BAD_ACCOUNT_NAME" => Self::BadAccountName,
+            "COMPLETE_CONNECTION_REQUIRED" => Self::CompleteConnectionRequired,
+            "INVALID_EMAIL" => Self::InvalidEmail,
+            "NEED_NICK" => Self::NeedNick,
+            "TEMPORARILY_UNAVAILABLE" => Self::TemporarilyUnavailable,
+            "UNACCEPTABLE_EMAIL" => Self::UnacceptableEmail,
+            "UNACCEPTABLE_PASSWORD" => Self::UnacceptablePassword,
+            "WEAK_PASSWORD" => Self::WeakPassword,
+            _ => return None,
+        })
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum RenameCodes {
+    ChannelNameInUse,
+    CannotRename
+}
+
+impl FromCode for RenameCodes {
+    fn from_code(code: &str) -> Option<Self> {
+        Some(match code {
+            "CHANNEL_NAME_IN_USE" => Self::ChannelNameInUse,
+            "CANNOT_RENAME" => Self::CannotRename,
+            _ => return None,
+        })
+    }
+}
+
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum SetNameCodes {
+    CannotChangeRealname,
+    InvalidRealname
+}
+
+impl FromCode for SetNameCodes {
+    fn from_code(code: &str) -> Option<Self> {
+        Some(match code {
+            "CANNOT_CHANGE_REALNAME" => Self::CannotChangeRealname,
+            "INVALID_REALNAME" => Self::InvalidRealname,
+            _ => return None,
+        })
+    }
+}
+
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum VerifyCodes {
+    AlreadyAuthenticated,
+    InvalidCode,
+    CompleteConnectionRequired,
+    TemporarilyUnavailable
+}
+
+impl FromCode for VerifyCodes {
+    fn from_code(code: &str) -> Option<Self> {
+        Some(match code {
+            "ALREADY_AUTHENTICATED" => Self::AlreadyAuthenticated,
+            "INVALID_CODE" => Self::InvalidCode,
+            "COMPLETE_CONNECTION_REQUIRED" => Self::CompleteConnectionRequired,
+            "TEMPORARILY_UNAVAILABLE" => Self::TemporarilyUnavailable,
+            _ => return None,
+        })
+    }
+}
+
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum StandardCodes {
+    AccountRequired,
+    InvalidUtf8,
+
+    Multiline(MultilineCodes),
+    ChatHistory(ChatHistoryCodes),
+    Join(JoinCodes),
+    Nick(NickCodes),
+    Redact(RedactCodes),
+    Register(RegisterCodes),
+    Rename(RenameCodes),
+    SetName(SetNameCodes),
+    Verify(VerifyCodes),
+
+    Custom(String)
+}
+
+impl StandardCodes {
+    fn known_from_message(command: &str, code: &str) -> Option<Self> {
+        Some(match command {
+            "BATCH" => Self::Multiline(MultilineCodes::from_code(code)?),
+            "CHATHISTORY" => Self::ChatHistory(ChatHistoryCodes::from_code(code)?),
+            "JOIN" => Self::Join(JoinCodes::from_code(code)?),
+            "NICK" => Self::Nick(NickCodes::from_code(code)?),
+            "REDACT" => Self::Redact(RedactCodes::from_code(code)?),
+            "REGISTER" => Self::Register(RegisterCodes::from_code(code)?),
+            "RENAME" => Self::Rename(RenameCodes::from_code(code)?),
+            "SETNAME" => Self::SetName(SetNameCodes::from_code(code)?),
+            "VERIFY" => Self::Verify(VerifyCodes::from_code(code)?),
+            _ => {
+                match code {
+                    "ACCOUNT_REQUIRED" => Self::AccountRequired,
+                    "INVALID_UTF8" => Self::InvalidUtf8,
+                    _ => Self::Custom(code.to_string())
+                }
+            }
+        })
+    }
+
+    pub fn from_message(command: &str, code: &str) -> Self {
+        Self::known_from_message(command, code).unwrap_or_else(|| Self::Custom(code.to_string()))
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum StandardTypes {
+    Fail,
+    Warn,
+    Note
+}
+
+impl StandardTypes {
+    pub fn is_standard_type(s: &str) -> bool {
+        s.eq_ignore_ascii_case("FAIL") || s.eq_ignore_ascii_case("WARN") || s.eq_ignore_ascii_case("NOTE")
+    }
+}
+
+impl FromStr for StandardTypes {
+    type Err = &'static str;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s.to_ascii_uppercase().as_str() {
+            "FAIL" => Ok(Self::Fail),
+            "WARN" => Ok(Self::Warn),
+            "NOTE" => Ok(Self::Note),
+            _ => Err("Unexpected standard response type, neither fail, warn or note.")
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::StandardCodes;
+
+    #[test]
+    fn parse_spec_example1() {
+        let (command, code) = ("ACC", "REG_INVALID_CALLBACK");
+        assert_eq!(StandardCodes::Custom("REG_INVALID_CALLBACK".to_string()), StandardCodes::from_message(command, code));
+    }
+
+    #[test]
+    fn parse_spec_example2() {
+        let (command, code) = ("BOX", "BOXES_INVALID");
+        assert_eq!(StandardCodes::Custom("BOXES_INVALID".to_string()), StandardCodes::from_message(command, code));
+    }
+
+    #[test]
+    fn parse_spec_example3() {
+        let (command, code) = ("*", "ACCOUNT_REQUIRED_TO_CONNECT");
+        assert_eq!(StandardCodes::Custom("ACCOUNT_REQUIRED_TO_CONNECT".to_string()), StandardCodes::from_message(command, code));
+    }
+
+    #[test]
+    fn parse_batch_example() {
+        let (command, code) = ("BATCH", "MULTILINE_MAX_BYTES");
+        assert_eq!(StandardCodes::Multiline(crate::standard_reply::MultilineCodes::MaxBytes), StandardCodes::from_message(command, code));
+    }
+}

src/client/mod.rs

@@ -47,6 +47,7 @@
 //! # }
 //! ```
 
+use atomic_counter::{AtomicCounter, RelaxedCounter};
 #[cfg(feature = "ctcp")]
 use chrono::prelude::*;
 use futures_util::{
@@ -76,12 +77,13 @@ use crate::{
     },
     error,
     proto::{
+        BatchSubCommand,
         mode::ModeType,
         CapSubCommand::{END, LS, REQ},
         Capability, ChannelMode, Command,
         Command::{
             ChannelMODE, AUTHENTICATE, CAP, INVITE, JOIN, KICK, KILL, NICK, NICKSERV, NOTICE, OPER,
-            PART, PASS, PONG, PRIVMSG, QUIT, SAMODE, SANICK, TOPIC, USER,
+            PART, PASS, PONG, PRIVMSG, QUIT, SAMODE, SANICK, TOPIC, USER, BATCH
         },
         Message, Mode, NegotiationVersion, Response,
     },
@@ -496,8 +498,12 @@ struct ClientState {
     sender: Sender,
     /// The configuration used with this connection.
     config: Config,
+    /// A thread-safe counter for batch IDs
+    batch_id: RelaxedCounter,
     /// A thread-safe map of channels to the list of users in them.
     chanlists: RwLock<HashMap<String, Vec<User>>>,
+    /// A thread-safe map of in-progress batch
+    inflight_batches: RwLock<HashMap<String, Vec<Message>>>,
     /// A thread-safe index to track the current alternative nickname being used.
     alt_nick_index: RwLock<usize>,
     /// Default ghost sequence to send if one is required but none is configured.
@@ -509,6 +515,8 @@ impl ClientState {
         ClientState {
             sender,
             config,
+            batch_id: RelaxedCounter::new(0),
+            inflight_batches: RwLock::new(HashMap::new()),
             chanlists: RwLock::new(HashMap::new()),
             alt_nick_index: RwLock::new(0),
             default_ghost_sequence: vec![String::from("GHOST")],
@@ -553,6 +561,30 @@ impl ClientState {
     /// Handles received messages internally for basic client functionality.
     fn handle_message(&self, msg: &Message) -> error::Result<()> {
         log::trace!("[RECV] {}", msg.to_string());
+
+        if let Some(tags) = msg.tags {
+            if let Some(batch_tag) = tags.into_iter().find(|tag| tag.0 == "batch") {
+                match batch_tag.1 {
+                    Some(batch_id) => {
+                        let inflight_batches = self.inflight_batches.read();
+                        // TODO: check if we negotiated batch as well.
+                        if !inflight_batches.contains_key(&batch_id) {
+                        } else {
+                            // Release the read lock, we are upgrading to a write lock.
+                            drop(inflight_batches);
+                            let mut inflight_batches = self.inflight_batches.write();
+                            // This message processing is delayed until the batch is finished.
+                            inflight_batches.entry(batch_id).and_modify(|messages| messages.push(msg.clone()));
+                            return Ok(());
+                        }
+                    },
+                    None => {
+                        // TODO: Return an invalid message error.
+                    }
+                }
+            }
+        }
+
         match msg.command {
             JOIN(ref chan, _, _) => self.handle_join(msg.source_nickname().unwrap_or(""), chan),
             PART(ref chan, _) => self.handle_part(msg.source_nickname().unwrap_or(""), chan),
@@ -579,6 +611,7 @@ impl ClientState {
                     }
                 }
             }
+            Command::BATCH(ref reference_tag, ref sub, ref params) => self.handle_batch(reference_tag, sub.as_ref(), params.as_ref())?,
             Command::Response(Response::RPL_NAMREPLY, ref args) => self.handle_namreply(args),
             Command::Response(Response::RPL_ENDOFMOTD, _)
             | Command::Response(Response::ERR_NOMOTD, _) => {
@@ -672,6 +705,40 @@ impl ClientState {
         }
     }
 
+    #[cfg(not(feature = "batch"))]
+    fn handle_batch(&self, _: &str, _: Option<&BatchSubCommand>, _: Option<&Vec<String>>) -> error::Result<()> {}
+
+    #[cfg(feature = "batch")]
+    fn handle_batch(&self, reference_tag: &str, sub: Option<&BatchSubCommand>, params: Option<&Vec<String>>) -> error::Result<()> {
+        // TODO: increase type safety here.
+        let is_start = reference_tag.chars().nth(0).unwrap() == '+';
+        let mut inflight_batches = self.inflight_batches.write();
+
+        // TODO: handle nested batches better.
+        // TODO: handling sub commands such as netsplit and netjoin could be done by having extra
+        // handlers for end users to warn them of an incoming netsplit or netjoin batch.
+        // If this is chathistory, handle_chathistory could also be designed.
+
+        let identifier = reference_tag[1..].to_string();
+        if is_start {
+            if inflight_batches.contains_key(&identifier) {
+                return Err(error::Error::BatchAlreadyExists(identifier));
+            }
+
+            // Create a new pending batch.
+            inflight_batches.insert(identifier, Vec::new());
+        } else {
+            // Remove the pending batches and replay all the messages.
+            let pending_messages = inflight_batches.remove(&reference_tag[1..].to_string()).ok_or(error::Error::BatchDisappearedBeforeEndOfBatchProcessed)?;
+            // Replay all delayed messages now.
+            for message in pending_messages {
+                self.handle_message(&message)?;
+            }
+        }
+
+        Ok(())
+    }
+
     #[cfg(not(feature = "channel-lists"))]
     fn handle_join(&self, _: &str, _: &str) {}
 
@@ -807,6 +874,21 @@ impl ClientState {
     }
 
     pub_state_base!();
+
+    /// Sends a client batch with an iterator as the body.
+    pub fn send_client_batch<I: Iterator<Item=Message>>(&mut self, msg_iterator: I) -> error::Result<()> {
+        let batch_id = format!("{}", self.batch_id.get());
+        self.send(BATCH(batch_id.clone(), None, None))?;
+        // Attach to all message that batch ID.
+        msg_iterator.for_each(|msg| {
+            self.send(msg);
+        });
+        // Close the batch.
+        self.send(BATCH(batch_id, None, None))?;
+        self.batch_id.inc();
+
+        Ok(())
+    }
 }
 
 /// Thread-safe sender that can be used with the client.

src/error.rs

@@ -123,6 +123,14 @@ pub enum Error {
     /// Stream has already been configured.
     #[error("stream has already been configured")]
     StreamAlreadyConfigured,
+
+    /// A end of batch message was sent after a pending batch was removed from the inflight list
+    #[error("batch disappeared before end of batch was processed")]
+    BatchDisappearedBeforeEndOfBatchProcessed,
+
+    /// A new batch was started with the same reference tag
+    #[error("batch {} already exists but a new batch request with the same tag was sent", .0)]
+    BatchAlreadyExists(String),
 }
 
 /// Errors that occur with configurations.