Attribute Macro on_message 

#[on_message]

Marks a method as a protobuf message handler.

Use this to handle specific protobuf message types. The message type is inferred from the method’s parameter type, which should be a protobuf message struct.

The method will automatically decode binary message data and call your handler with the decoded message object.

Parameters

The handler can receive:

• ctx: &Context (optional) - Access to current replay state
• Message parameter - The decoded protobuf message (inferred from parameter type)
• Message can be taken by value or reference

Supported Message Types

• CDotaUserMsgChatMessage and other Dota 2 messages
• CCitadelUserMsgChatMsg and other Deadlock messages
• CCSUserMessage_* and other CS2 messages
• Any protobuf message type with a decode method

Examples

Handle Dota 2 chat messages

#[on_message]
fn on_chat(&mut self, ctx: &Context, msg: CDotaUserMsgChatMessage) -> ObserverResult {
    println!("[{}] {}", ctx.tick(), msg.message_text());
    Ok(())
}

Handle without context

#[on_message]
fn on_chat(&mut self, msg: CDotaUserMsgChatMessage) -> ObserverResult {
    println!("Message: {}", msg.message_text());
    Ok(())
}

Handle by reference

#[on_message]
fn on_chat(&mut self, msg: &CDotaUserMsgChatMessage) -> ObserverResult {
    println!("Message: {}", msg.message_text());
    Ok(())
}