tenebrous-dicebot/src/commands.rs

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Rust
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use crate::context::Context;
use crate::error::BotError;
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use async_trait::async_trait;
use thiserror::Error;
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pub mod basic_rolling;
pub mod cofd;
pub mod cthulhu;
pub mod management;
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pub mod misc;
pub mod parser;
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pub mod variables;
/// A custom error type specifically related to parsing command text.
/// Does not wrap an execution failure.
#[derive(Error, Debug)]
pub enum CommandError {
#[error("invalid command: {0}")]
InvalidCommand(String),
#[error("ignored command")]
IgnoredCommand,
}
/// A successfully executed command returns a message to be sent back
/// to the user in HTML (plain text used as a fallback by message
/// formatter).
#[derive(Debug)]
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pub struct Execution {
html: String,
}
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impl Execution {
pub fn new(html: String) -> CommandResult {
Ok(Execution { html })
}
/// Response message in HTML.
pub fn html(&self) -> String {
self.html.clone()
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}
}
/// Wraps a command execution failure. Provides HTML formatting for
/// any error message from the BotError type, similar to how Execution
/// provides formatting for successfully executed commands.
#[derive(Error, Debug)]
#[error("{0}")]
pub struct ExecutionError(#[from] BotError);
impl From<crate::db::errors::DataError> for ExecutionError {
fn from(error: crate::db::errors::DataError) -> Self {
Self(BotError::DataError(error))
}
}
impl ExecutionError {
/// Error message in bolded HTML.
pub fn html(&self) -> String {
format!("<p><strong>{}</strong></p>", self.0)
}
}
/// Wraps either a successful command execution response, or an error
/// that occurred.
pub type CommandResult = Result<Execution, ExecutionError>;
/// Extract response messages out of a type, whether it is success or
/// failure.
pub trait ResponseExtractor {
/// HTML representation of the message, directly mentioning the
/// username.
fn message_html(&self, username: &str) -> String;
}
impl ResponseExtractor for CommandResult {
/// Error message in bolded HTML.
fn message_html(&self, username: &str) -> String {
match self {
Ok(resp) => format!("<p>{}</p><p>{}</p>", username, resp.html).replace("\n", "<br/>"),
Err(e) => format!("<p>{}</p><p>{}</p>", username, e.html()).replace("\n", "<br/>"),
}
}
}
/// The trait that any command that can be executed must implement.
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#[async_trait]
pub trait Command: Send + Sync {
async fn execute(&self, ctx: &Context<'_>) -> CommandResult;
fn name(&self) -> &'static str;
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}
/// Attempt to execute a command, and return the content that should
/// go back to Matrix, if the command was executed (successfully or
/// not). If a command is determined to be ignored, this function will
/// return None, signifying that we should not send a response.
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pub async fn execute_command(ctx: &Context<'_>) -> CommandResult {
let cmd = parser::parse_command(&ctx.message_body)?;
cmd.execute(ctx).await
}
#[cfg(test)]
mod tests {
use super::*;
macro_rules! dummy_room {
() => {
crate::context::RoomContext {
id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
display_name: "displayname",
}
};
}
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#[tokio::test]
async fn unrecognized_command() {
let db = crate::db::Database::new_temp().unwrap();
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let ctx = Context {
db: db,
matrix_client: &matrix_sdk::Client::new("http://example.com").unwrap(),
room: dummy_room!(),
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username: "myusername",
message_body: "!notacommand",
};
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let result = execute_command(&ctx).await;
assert!(result.is_err());
}
}