mirrors/signal-desktop
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages 2 Wiki Activity Actions

DB/Index Redux

Browse source 
This change removes the timestamp field from messages and conversations
in favor of multiple semantically named timestamp fields: sent_at,
received_at on messages; active_at on conversations. This requires/lets
us rethink and improve our indexing scheme thusly:

The inbox index on conversations will order entries by the
conversation.active_at property, which should only appear on
conversations destined for the inbox.

The receipt index will use the message.sent_at property, for effecient
lookup of outgoing messages by timestamp, for use in processing delivery
receipts.

The group index on conversation.members is multi-entry, meaning that
looking up any phone number in this index will efficiently yield all
groups the number belongs to.

The conversation index lets us scan messages in a single conversation,
in the order they were received (or the reverse order). It is a compound
index on [conversationId, received_at].
This commit is contained in:
lilia 2014-12-11 19:41:40 -08:00
parent 9c736df7d0
commit 006653ed8e
5 changed files with 58 additions and 35 deletions
Download patch file Download diff file Expand all files Collapse all files

8
js/database.js
View file

@ -24,12 +24,14 @@
{
version: "1.0",
migrate: function(transaction, next) {
console.log('migratetion 1.0');
console.log('migration 1.0');
var messages = transaction.db.createObjectStore("messages");
messages.createIndex("conversation", "conversationId", { unique: false });
messages.createIndex("conversation", ["conversationId", "received_at"], { unique: false });
messages.createIndex("receipt", "sent_at", { unique: false });
var conversations = transaction.db.createObjectStore("conversations");
conversations.createIndex("timestamp", "timestamp", { unique: false });
conversations.createIndex("inbox", "active_at", { unique: false });
conversations.createIndex("group", "members", { unique: false, multiEntry: true });
next();
}
}