2022-12-24 21:16:23 +11:00
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use super::ListenerSession;
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use crate::DResult;
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use crate::db::{DBTrans, DBPool};
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use ansi_macro::ansi;
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2022-12-24 21:16:23 +11:00
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use phf::phf_map;
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use async_trait::async_trait;
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use crate::models::session::Session;
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2022-12-24 21:16:23 +11:00
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mod parsing;
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mod ignore;
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mod help;
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pub struct VerbContext<'l> {
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session: &'l ListenerSession,
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session_dat: &'l mut Session,
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trans: &'l DBTrans
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}
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pub enum CommandHandlingError {
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UserError(String),
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SystemError(Box<dyn std::error::Error + Send + Sync>)
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}
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use CommandHandlingError::*;
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#[async_trait]
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pub trait UserVerb {
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async fn handle(self: &Self, ctx: &VerbContext, verb: &str, remaining: &str) -> UResult<()>;
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}
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pub type UserVerbRef = &'static (dyn UserVerb + Sync + Send);
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pub type UResult<A> = Result<A, CommandHandlingError>;
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impl From<Box<dyn std::error::Error + Send + Sync>> for CommandHandlingError {
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fn from(input: Box<dyn std::error::Error + Send + Sync>) -> CommandHandlingError {
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SystemError(input)
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}
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}
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pub fn user_error<A>(msg: String) -> UResult<A> {
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Err(UserError(msg))
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}
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type UserVerbRegistry = phf::Map<&'static str, UserVerbRef>;
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static ALWAYS_AVAILABLE_COMMANDS: UserVerbRegistry = phf_map! {
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"" => ignore::VERB,
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"help" => help::VERB
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};
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pub async fn handle(session: &ListenerSession, msg: &str, pool: &DBPool) -> DResult<()> {
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let (cmd, params) = parsing::parse_command_name(msg);
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let trans = pool.start_transaction().await?;
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let mut session_dat = match trans.get_session_model(session).await? {
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None => { return Ok(()) }
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Some(v) => v
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};
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let handler_opt = ALWAYS_AVAILABLE_COMMANDS.get(cmd);
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let ctx = VerbContext { session, trans: &trans, session_dat: &mut session_dat };
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match handler_opt {
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None => {
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trans.queue_for_session(session,
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ansi!(
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"That's not a command I know. Try <bold>help<reset>\r\n"
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)
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).await?;
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}
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Some(handler) => {
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match handler.handle(&ctx, cmd, params).await {
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Ok(()) => {}
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Err(UserError(err_msg)) => {
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trans.queue_for_session(session, &(err_msg + "\r\n")).await?;
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}
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Err(SystemError(e)) => Err(e)?
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}
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}
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}
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trans.commit().await?;
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Ok(())
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}
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