Mailspring/packages/isomorphic-core
Christine Spang a23813a11c [local-sync] For generic IMAP, Thread based on Message-Id, In-Reply-To & References
Summary:
This swaps out our generic IMAP threading mechanism to use the threading
headers on the message instead of the prior way of grouping by subject
and then differentiating based on participants, as that design was
somewhat driven by what we could accomplish easily given legacy data
schema decisions and has serious caveats, such as different threads between
the same people with the same subject being misthreaded together. With K2, we
have free reign to change the data format, so we can do it right.

The algorithm is super simple:
- Define "references" as the union of the Message-Id, In-Reply-To, and
References headers on a message, filtered for valid RFC2822 Message-IDs
- On message sync, if any element of the new message's references
matches any element of an existing message's references, thread them
together

In order to accomplish this, we need to store References in a way that
allows each element to be indexed for fast lookup. That meant either
using the sqlite JSON1 extension + expression-based indices, or creating
a new table. I chose the latter as a time-tested and simple solution,
since we don't need the flexibility of JSON here.

Test Plan: manual - unit tests coming

Reviewers: khamidou, evan, juan

Reviewed By: evan, juan

Differential Revision: https://phab.nylas.com/D3651
2017-01-13 10:39:54 -08:00
..
src [local-sync] For generic IMAP, Thread based on Message-Id, In-Reply-To & References 2017-01-13 10:39:54 -08:00
index.js [local-sync]: Move sendmail-client and errors to isomorphic-core 2016-12-15 12:29:56 -08:00
package.json Update sequelize point version everywhere 2017-01-04 15:47:16 -08:00