62aab0d9ee
The previous commit introduced a bug where it was not intuitive for the user to scroll again. For the current narrow, new messages were fetched again only when scrolled to the bottom as usually there are many messages displayed. However when the edge case mentioned in the previous commit occured, it was not very obvious that a scroll should be done or we could already be at the bottom and could not scroll again to trigger a fetch. `message_viewport.at_bottom` has a relevant comment explaining this behaviour. The previous commit handled the rare race condition. However, there is a possibility that the rare race condition might occur again while we are handling the previous condition. This commit resolves these 2 problems by performing a re-fetch while also resetting the `expected_max_message_id` and this approach has two benefits: 1. The reset prevents an infinite loop, if somehow the expected max message's id gets corrupted resulting in a situation where the server can never send an id greater than that even after fetching. 2. Even though we stop after just one re-fetch the race condition might recursively occur while we handle the previous race condition. And even though the reset prevents multiple re-fetches, we don't have the missing message problem. This is because we treat the next race condition as a new race condition instead of it being a continuation of the previous. The `expected_max_message_id` gets updated again, on receiving a new message. Thus it can again enter the `fetch_status` block as the reset value is updated again. |
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| CODE_OF_CONDUCT.md | ||
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| Dockerfile-postgresql | ||
| LICENSE | ||
| NOTICE | ||
| README.md | ||
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README.md
Zulip overview
Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations. Zulip is used by open source projects, Fortune 500 companies, large standards bodies, and others who need a real-time chat system that allows users to easily process hundreds or thousands of messages a day. With over 500 contributors merging over 500 commits a month, Zulip is also the largest and fastest growing open source group chat project.
Getting started
Click on the appropriate link below. If nothing seems to apply, join us on the Zulip community server and tell us what's up!
You might be interested in:
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Contributing code. Check out our guide for new contributors to get started. Zulip prides itself on maintaining a clean and well-tested codebase, and a stock of hundreds of beginner-friendly issues.
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Contributing non-code. Report an issue, translate Zulip into your language, write for the Zulip blog, or give us feedback. We would love to hear from you, even if you're just trying the product out.
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Supporting Zulip. Advocate for your organization to use Zulip, write a review in the mobile app stores, or upvote Zulip on product comparison sites.
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Checking Zulip out. The best way to see Zulip in action is to drop by the Zulip community server. We also recommend reading Zulip for open source, Zulip for companies, or Zulip for working groups and part time communities.
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Running a Zulip server. Use a preconfigured Digital Ocean droplet, install Zulip directly, or use Zulip's experimental Docker image. Commercial support is available; see https://zulip.com/plans for details.
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Using Zulip without setting up a server. https://zulip.com offers free and commercial hosting, including providing our paid plan for free to fellow open source projects.
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Participating in outreach programs like Google Summer of Code.
You may also be interested in reading our blog or following us on twitter. Zulip is distributed under the Apache 2.0 license.