f95dd628bd
The main race conditions, which actually happened in production was with concurrent execution of deliver_email and clear_scheduled_emails. clear_scheduled_emails could delete all email.users in the middle of deliver_email execution, causing it to pass empty to_user_ids list to send_email. We mitigate this by getting the list of user ids in a single query and moving forward with that snapshot, not having to worry about database data being mutated anymore. clear_scheduled_emails had potential race conditions with concurrent execution of itself due to not locking the appropriate rows upon selecting them for the purpose of potentially deleting them. FOR UPDATE locks need to be acquired to prevent simultaneous mutation. Tested manually with some print+sleep debugging to make some races happen. fixes #zulip-2k (sentry) |
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| .sonarcloud.properties | ||
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| CODE_OF_CONDUCT.md | ||
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| LICENSE | ||
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| NOTICE | ||
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| README.md | ||
| SECURITY.md | ||
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| version.py | ||
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| yarn.lock | ||
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 DigitalOcean 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.