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stream_topic_history: Remove the concept of historical topics. 

It is hard to maintain the concept of `historical` topics locally,
thus, we remove them entirely to simplify what we can do here.

This commit can introduce bugs when are addressed in the next commit.
This commit is contained in:
Aman Agrawal 2024-06-26 03:35:44 +00:00 committed by Tim Abbott
parent d381a358d0
commit d80dba75c5
1 changed files with 11 additions and 33 deletions
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34
web/src/stream_topic_history.ts
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@ -15,9 +15,8 @@ const request_pending_stream_ids = new Set<number>();
export function all_topics_in_cache(sub: StreamSubscription): boolean {
// Checks whether this browser's cache of contiguous messages
// (used to locally render narrows) in all_messages_data has all
// messages from a given stream, and thus all historical topics
// for it. Because all_messages_data is a range, we just need to
// compare it to the range of history on the stream.
// messages from a given stream. Because all_messages_data is a range,
// we just need to compare it to the range of history on the stream.
// If the cache isn't initialized, it's a clear false.
if (all_messages_data === undefined || all_messages_data.empty()) {
@ -78,14 +77,7 @@ export function stream_has_topics(stream_id: number): boolean {
return history.has_topics();
}
export type TopicHistoryEntry =
| {
historical: true;
message_id: number;
pretty_name: string;
}
| {
historical: false;
export type TopicHistoryEntry = {
count: number;
message_id: number;
pretty_name: string;
@ -119,8 +111,6 @@ export class PerStreamHistory {
topic would likely suffice, though we need to think about
private stream corner cases).
* pretty_name: The topic_name, with original case.
* historical: Whether the user actually received any messages in
the topic (has UserMessage rows) or is just viewing the stream.
* count: Number of known messages in the topic. Used to detect
when the last messages in a topic were moved to other topics or
deleted.
@ -154,15 +144,12 @@ export class PerStreamHistory {
this.topics.set(topic_name, {
message_id,
pretty_name: topic_name,
historical: false,
count: 1,
});
return;
}
if (!existing.historical) {
existing.count += 1;
}
if (message_id > existing.message_id) {
existing.message_id = message_id;
@ -177,13 +164,6 @@ export class PerStreamHistory {
return;
}
if (existing.historical) {
// We can't trust that a topic rename applied to
// the entire history of historical topic, so we
// will always leave it in the sidebar.
return;
}
if (existing.count <= num_messages) {
this.topics.delete(topic_name);
return;
@ -193,9 +173,7 @@ export class PerStreamHistory {
}
add_history(server_history: ServerTopicHistoryEntry[]): void {
// This method populates historical topics from the
// server. We have less data about these than the
// client can maintain for newer topics.
// This method populates list of topics from the server.
for (const obj of server_history) {
const topic_name = obj.name;
@ -203,7 +181,7 @@ export class PerStreamHistory {
const existing = this.topics.get(topic_name);
if (existing && !existing.historical) {
if (existing) {
// Trust out local data more, since it
// maintains counts.
continue;
@ -216,7 +194,7 @@ export class PerStreamHistory {
this.topics.set(topic_name, {
message_id,
pretty_name: topic_name,
historical: true,
count: 0,
});
this.update_stream_max_message_id(message_id);
}