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use crate::discord::ids::{
Id,
marker::{ChannelMarker, MessageMarker},
};
use crate::{
DiscordClient,
discord::{AppCommand, AppEvent, MessageHistoryAfterMode, MessageHistoryLoadTarget},
logging,
};
const MESSAGE_HISTORY_LIMIT: u16 = 50;
const THREAD_PREVIEW_LIMIT: u16 = 1;
pub(super) async fn handle(client: DiscordClient, command: AppCommand) {
match command {
AppCommand::LoadMessageHistory { channel_id, before } => {
if let Some(before) = before
&& !client.begin_older_message_history_request(channel_id, before)
{
return;
}
let endpoint =
format_message_history_endpoint(channel_id, before, MESSAGE_HISTORY_LIMIT);
match client
.load_message_history(channel_id, before, MESSAGE_HISTORY_LIMIT)
.await
{
Ok(messages) => {
client
.publish_event(AppEvent::MessageHistoryLoaded {
channel_id,
before,
messages,
})
.await;
}
Err(error) => {
let message = format!("load message history failed: {error}");
let detail = error.log_detail();
logging::error(
"history",
format!(
"op=load_message_history channel_id={} before={} limit={} endpoint=\"{endpoint}\" {message}; detail={detail}",
channel_id.get(),
before.map(|id| id.get()).unwrap_or_default(),
MESSAGE_HISTORY_LIMIT,
),
);
publish_message_history_load_failed(
&client,
channel_id,
before
.map(|before| MessageHistoryLoadTarget::Older { before })
.unwrap_or(MessageHistoryLoadTarget::Latest),
message,
)
.await;
}
}
}
AppCommand::RefreshMessageHistory { channel_id } => {
let endpoint = format_message_history_endpoint(channel_id, None, MESSAGE_HISTORY_LIMIT);
match client
.load_message_history(channel_id, None, MESSAGE_HISTORY_LIMIT)
.await
{
Ok(messages) => {
client
.publish_event(AppEvent::MessageHistoryRefreshed {
channel_id,
messages,
})
.await;
}
Err(error) => {
let message = format!("refresh message history failed: {error}");
let detail = error.log_detail();
logging::error(
"history",
format!(
"op=refresh_message_history channel_id={} limit={} endpoint=\"{endpoint}\" {message}; detail={detail}",
channel_id.get(),
MESSAGE_HISTORY_LIMIT,
),
);
publish_message_history_load_failed(
&client,
channel_id,
MessageHistoryLoadTarget::Latest,
message,
)
.await;
}
}
}
AppCommand::LoadMessageHistoryAfter {
channel_id,
after,
mode,
} => {
if !client.begin_message_history_after_request(channel_id, after, mode) {
return;
}
let (operation, failure_prefix) = match mode {
MessageHistoryAfterMode::GapFill => {
("load_message_history_after", "load message history failed")
}
MessageHistoryAfterMode::CatchUp => (
"catch_up_message_history_after",
"catch up message history failed",
),
};
let endpoint = format_message_history_anchor_endpoint(
channel_id,
"after",
after,
MESSAGE_HISTORY_LIMIT,
);
match client
.load_message_history_after(channel_id, after, MESSAGE_HISTORY_LIMIT)
.await
{
Ok(messages) => {
let has_more = messages.len() >= usize::from(MESSAGE_HISTORY_LIMIT);
client
.publish_event(AppEvent::MessageHistoryAfterLoaded {
channel_id,
after,
messages,
has_more,
mode,
})
.await;
}
Err(error) => {
let message = format!("{failure_prefix}: {error}");
let detail = error.log_detail();
logging::error(
"history",
format!(
"op={operation} channel_id={} after={} limit={} endpoint=\"{endpoint}\" {message}; detail={detail}",
channel_id.get(),
after.get(),
MESSAGE_HISTORY_LIMIT,
),
);
publish_message_history_load_failed(
&client,
channel_id,
MessageHistoryLoadTarget::Newer { after },
message,
)
.await;
}
}
}
AppCommand::LoadMessageHistoryAround {
channel_id,
message_id,
} => {
let endpoint = format_message_history_anchor_endpoint(
channel_id,
"around",
message_id,
MESSAGE_HISTORY_LIMIT,
);
match client
.load_message_history_around(channel_id, message_id, MESSAGE_HISTORY_LIMIT)
.await
{
Ok(messages) => {
client
.publish_event(AppEvent::MessageHistoryAroundLoaded {
channel_id,
message_id,
messages,
})
.await;
}
Err(error) => {
let message = format!("load message history failed: {error}");
let detail = error.log_detail();
logging::error(
"history",
format!(
"op=load_message_history_around channel_id={} message_id={} limit={} endpoint=\"{endpoint}\" {message}; detail={detail}",
channel_id.get(),
message_id.get(),
MESSAGE_HISTORY_LIMIT,
),
);
publish_message_history_load_failed(
&client,
channel_id,
MessageHistoryLoadTarget::Around { message_id },
message,
)
.await;
}
}
}
AppCommand::LoadThreadPreview {
channel_id,
message_id,
} => match client
.load_message_history(channel_id, None, THREAD_PREVIEW_LIMIT)
.await
{
Ok(messages) => {
if let Some(message) = messages
.into_iter()
.next()
.filter(|message| message.message_id == message_id)
{
client
.publish_event(AppEvent::ThreadPreviewLoaded {
channel_id,
message,
})
.await;
} else {
logging::error(
"history",
format!(
"load thread preview missing requested message: channel_id={} message_id={}",
channel_id.get(),
message_id.get(),
),
);
client
.publish_event(AppEvent::ThreadPreviewLoadFailed {
channel_id,
message_id,
})
.await;
}
}
Err(error) => {
let message = format!("load thread preview failed: {error}");
let detail = error.log_detail();
logging::error(
"history",
format!(
"op=load_thread_preview channel_id={} message_id={} {message}; detail={detail}",
channel_id.get(),
message_id.get(),
),
);
client
.publish_event(AppEvent::ThreadPreviewLoadFailed {
channel_id,
message_id,
})
.await;
}
},
AppCommand::LoadForumPosts {
guild_id,
channel_id,
archive_state,
offset,
} => {
match client
.load_forum_posts(guild_id, channel_id, archive_state, offset)
.await
{
Ok(page) => {
client
.publish_event(AppEvent::ForumPostsLoaded {
channel_id,
archive_state,
offset,
next_offset: page.next_offset,
threads: page.threads,
first_messages: page.first_messages,
has_more: page.has_more,
})
.await;
}
Err(error) => {
let message = format!("load forum posts failed: {error}");
let detail = error.log_detail();
logging::error(
"history",
format!(
"op=load_forum_posts guild_id={} channel_id={} archive_state={} offset={} {message}; detail={detail}",
guild_id.get(),
channel_id.get(),
archive_state.as_log_label(),
offset,
),
);
client
.publish_event(AppEvent::ForumPostsLoadFailed {
channel_id,
archive_state,
offset,
message,
})
.await;
}
}
}
AppCommand::SearchMessages { query } => match client.search_messages(query.clone()).await {
Ok(page) => {
client
.publish_event(AppEvent::MessageSearchLoaded { page })
.await;
}
Err(error) => {
let message = format!("message search failed: {error}");
let detail = error.log_detail();
logging::error(
"search",
format!(
"op=message_search offset={} {message}; detail={detail}",
query.offset,
),
);
client
.publish_event(AppEvent::MessageSearchLoadFailed { query, message })
.await;
}
},
_ => unreachable!("non-history command routed to history handler"),
}
}
async fn publish_message_history_load_failed(
client: &DiscordClient,
channel_id: Id<ChannelMarker>,
target: MessageHistoryLoadTarget,
message: String,
) {
client
.publish_event(AppEvent::MessageHistoryLoadFailed {
channel_id,
target,
message,
})
.await;
}
/// Builds the Discord REST endpoint string for a message-history request so
/// debug logs name exactly what was attempted, e.g.
/// `GET /channels/123/messages?limit=50&before=789`.
fn format_message_history_endpoint(
channel_id: Id<ChannelMarker>,
before: Option<Id<MessageMarker>>,
limit: u16,
) -> String {
match before {
Some(message_id) => format!(
"GET /channels/{}/messages?limit={limit}&before={}",
channel_id.get(),
message_id.get(),
),
None => format!("GET /channels/{}/messages?limit={limit}", channel_id.get(),),
}
}
fn format_message_history_anchor_endpoint(
channel_id: Id<ChannelMarker>,
anchor_name: &str,
message_id: Id<MessageMarker>,
limit: u16,
) -> String {
format!(
"GET /channels/{}/messages?limit={limit}&{anchor_name}={}",
channel_id.get(),
message_id.get(),
)
}