2020-11-06 21:52:49 +00:00
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use crate::db::errors::DataError;
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2020-11-09 21:14:37 +00:00
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use crate::db::schema::convert_u64;
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2020-11-29 13:59:59 +00:00
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use crate::models::RoomInfo;
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2020-11-09 21:14:37 +00:00
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use byteorder::BigEndian;
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2020-11-10 20:35:27 +00:00
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use log::{debug, error, log_enabled};
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2020-11-07 14:37:56 +00:00
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use sled::transaction::TransactionalTree;
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2020-11-06 21:52:49 +00:00
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use sled::Transactional;
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2020-11-09 21:14:37 +00:00
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use sled::{CompareAndSwapError, Tree};
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2020-11-06 21:52:49 +00:00
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use std::collections::HashSet;
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use std::str;
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2020-11-09 21:14:37 +00:00
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use std::time::{SystemTime, UNIX_EPOCH};
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use tokio::task::JoinHandle;
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use zerocopy::byteorder::U64;
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use zerocopy::AsBytes;
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2020-11-06 21:52:49 +00:00
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#[derive(Clone)]
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pub struct Rooms {
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2020-11-29 13:59:59 +00:00
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/// Room ID -> RoomInfo struct (single entries).
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/// Key is just room ID as bytes.
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2020-11-06 21:52:49 +00:00
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pub(in crate::db) roomid_roominfo: Tree,
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/// Room ID -> list of usernames in room.
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pub(in crate::db) roomid_usernames: Tree,
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/// Username -> list of room IDs user is in.
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pub(in crate::db) username_roomids: Tree,
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2020-11-09 21:14:37 +00:00
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/// Room ID(str) 0xff event ID(str) -> timestamp. Records event
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/// IDs that we have received, so we do not process twice.
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pub(in crate::db) roomeventid_timestamp: Tree,
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/// Room ID(str) 0xff timestamp(u64) -> event ID. Records event
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/// IDs with timestamp as the primary key instead. Exists to allow
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/// easy scanning of old roomeventid_timestamp records for
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/// removal. Be careful with u64, it can have 0xff and 0xfe bytes.
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/// A simple split on 0xff will not work with this key. Instead,
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/// it is meant to be split on the first 0xff byte only, and
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/// separated into room ID and timestamp.
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pub(in crate::db) roomtimestamp_eventid: Tree,
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2020-11-06 21:52:49 +00:00
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}
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2020-11-09 21:14:37 +00:00
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/// An enum that can hold either a regular sled Tree, or a
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/// Transactional tree.
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2020-11-07 20:47:49 +00:00
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#[derive(Clone, Copy)]
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2020-11-07 14:37:56 +00:00
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enum TxableTree<'a> {
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Tree(&'a Tree),
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Tx(&'a TransactionalTree),
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}
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impl<'a> Into<TxableTree<'a>> for &'a Tree {
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fn into(self) -> TxableTree<'a> {
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TxableTree::Tree(self)
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}
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}
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impl<'a> Into<TxableTree<'a>> for &'a TransactionalTree {
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fn into(self) -> TxableTree<'a> {
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TxableTree::Tx(self)
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}
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}
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2020-11-09 21:14:37 +00:00
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/// A set of functions that can be used with a sled::Tree that stores
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/// HashSets as its values. Atomicity is partially handled. If the
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/// Tree is a transactional tree, operations will be atomic.
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/// Otherwise, there is a potential non-atomic step.
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mod hashset_tree {
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use super::*;
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fn insert_set<'a, T: Into<TxableTree<'a>>>(
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tree: T,
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key: &[u8],
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set: HashSet<String>,
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) -> Result<(), DataError> {
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let serialized = bincode::serialize(&set)?;
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match tree.into() {
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TxableTree::Tree(tree) => tree.insert(key, serialized)?,
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TxableTree::Tx(tx) => tx.insert(key, serialized)?,
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};
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Ok(())
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}
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pub(super) fn get_set<'a, T: Into<TxableTree<'a>>>(
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tree: T,
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key: &[u8],
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) -> Result<HashSet<String>, DataError> {
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let set: HashSet<String> = match tree.into() {
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TxableTree::Tree(tree) => tree.get(key)?,
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TxableTree::Tx(tx) => tx.get(key)?,
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}
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.map(|bytes| bincode::deserialize::<HashSet<String>>(&bytes))
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.unwrap_or(Ok(HashSet::new()))?;
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Ok(set)
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}
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pub(super) fn remove_from_set<'a, T: Into<TxableTree<'a>> + Copy>(
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tree: T,
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key: &[u8],
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value_to_remove: &str,
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) -> Result<(), DataError> {
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let mut set = get_set(tree, key)?;
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set.remove(value_to_remove);
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insert_set(tree, key, set)?;
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Ok(())
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}
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2020-11-09 21:14:37 +00:00
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pub(super) fn add_to_set<'a, T: Into<TxableTree<'a>> + Copy>(
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tree: T,
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key: &[u8],
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value_to_add: String,
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) -> Result<(), DataError> {
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let mut set = get_set(tree, key)?;
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set.insert(value_to_add);
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insert_set(tree, key, set)?;
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Ok(())
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}
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2020-11-07 20:47:49 +00:00
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}
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2020-11-09 21:14:37 +00:00
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/// Functions that specifically relate to the "timestamp index" tree,
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2020-11-10 20:22:18 +00:00
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/// which is stored on the Rooms instance as a tree called
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2020-11-09 21:14:37 +00:00
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/// roomtimestamp_eventid. Tightly coupled to the event watcher in the
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/// Rooms impl, and only factored out for unit testing.
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mod timestamp_index {
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use super::*;
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/// Insert an entry from the main roomeventid_timestamp Tree into
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/// the timestamp index. Keys in this Tree are stored as room ID
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/// 0xff timestamp, with the value being a hashset of event IDs
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/// received at the time. The parameters come from an insert to
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/// that Tree, where the key is room ID 0xff event ID, and the
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/// value is the timestamp.
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pub(super) fn insert(
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roomtimestamp_eventid: &Tree,
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key: &[u8],
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timestamp_bytes: &[u8],
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) -> Result<(), DataError> {
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let parts: Vec<&[u8]> = key.split(|&b| b == 0xff).collect();
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if let [room_id, event_id] = parts[..] {
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let mut ts_key = room_id.to_vec();
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ts_key.push(0xff);
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ts_key.extend_from_slice(×tamp_bytes);
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log_index_record(room_id, event_id, ×tamp_bytes);
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2020-11-10 20:35:27 +00:00
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let event_id = str::from_utf8(event_id)?;
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hashset_tree::add_to_set(roomtimestamp_eventid, &ts_key, event_id.to_owned())?;
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Ok(())
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} else {
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Err(DataError::InvalidValue)
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}
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}
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2020-11-10 20:35:27 +00:00
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/// Log a debug message.
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fn log_index_record(room_id: &[u8], event_id: &[u8], timestamp: &[u8]) {
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if log_enabled!(log::Level::Debug) {
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debug!(
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"Recording event {} | {} received at {} in timestamp index.",
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str::from_utf8(room_id).unwrap_or("[invalid room id]"),
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str::from_utf8(event_id).unwrap_or("[invalid event id]"),
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convert_u64(timestamp).unwrap_or(0)
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);
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}
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}
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2020-11-07 14:37:56 +00:00
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}
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2020-11-06 21:52:49 +00:00
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impl Rooms {
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pub(in crate::db) fn new(db: &sled::Db) -> Result<Rooms, sled::Error> {
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Ok(Rooms {
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roomid_roominfo: db.open_tree("roomid_roominfo")?,
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roomid_usernames: db.open_tree("roomid_usernames")?,
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username_roomids: db.open_tree("username_roomids")?,
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roomeventid_timestamp: db.open_tree("roomeventid_timestamp")?,
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roomtimestamp_eventid: db.open_tree("roomtimestamp_eventid")?,
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})
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}
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/// Start an event subscriber that listens for inserts made by the
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/// `should_process` function. This event handler duplicates the
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/// entry by timestamp instead of event ID.
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pub(in crate::db) fn start_handler(&self) -> JoinHandle<()> {
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//Clone due to lifetime requirements.
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let roomeventid_timestamp = self.roomeventid_timestamp.clone();
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let roomtimestamp_eventid = self.roomtimestamp_eventid.clone();
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tokio::spawn(async move {
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let mut subscriber = roomeventid_timestamp.watch_prefix(b"");
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// TODO make this handler receive kill messages somehow so
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// we can unit test it and gracefully shut it down.
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while let Some(event) = (&mut subscriber).await {
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if let sled::Event::Insert { key, value } = event {
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match timestamp_index::insert(&roomtimestamp_eventid, &key, &value) {
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Err(e) => {
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error!("Unable to update the timestamp index: {}", e);
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}
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_ => (),
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}
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}
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}
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2020-11-06 21:52:49 +00:00
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})
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}
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2020-11-09 21:14:37 +00:00
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/// Determine if an event in a room should be processed. The event
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/// is atomically recorded and true returned if the database has
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/// not seen tis event yet. If the event already exists in the
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/// database, the function returns false. Events are recorded by
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/// this function by inserting the (system-local) timestamp in
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/// epoch seconds.
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pub fn should_process(&self, room_id: &str, event_id: &str) -> Result<bool, DataError> {
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let mut key = room_id.as_bytes().to_vec();
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key.push(0xff);
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key.extend_from_slice(event_id.as_bytes());
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let timestamp: U64<BigEndian> = U64::new(
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SystemTime::now()
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.duration_since(UNIX_EPOCH)
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.expect("Clock has gone backwards")
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.as_secs(),
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);
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match self.roomeventid_timestamp.compare_and_swap(
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key,
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None as Option<&[u8]>,
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Some(timestamp.as_bytes()),
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)? {
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Ok(()) => Ok(true),
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Err(CompareAndSwapError { .. }) => Ok(false),
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}
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}
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2020-11-29 13:59:59 +00:00
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pub fn insert_room_info(&self, info: &RoomInfo) -> Result<(), DataError> {
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let key = info.room_id.as_bytes();
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let serialized = bincode::serialize(&info)?;
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self.roomid_roominfo.insert(key, serialized)?;
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Ok(())
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}
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2020-11-29 21:29:13 +00:00
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pub fn get_room_info(&self, room_id: &str) -> Result<Option<RoomInfo>, DataError> {
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let key = room_id.as_bytes();
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2020-11-29 16:55:23 +00:00
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let room_info: Option<RoomInfo> = self
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.roomid_roominfo
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.get(key)?
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.map(|bytes| bincode::deserialize(&bytes))
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.transpose()?;
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Ok(room_info)
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}
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2020-11-07 14:37:56 +00:00
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pub fn get_rooms_for_user(&self, username: &str) -> Result<HashSet<String>, DataError> {
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hashset_tree::get_set(&self.username_roomids, username.as_bytes())
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}
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pub fn get_users_in_room(&self, room_id: &str) -> Result<HashSet<String>, DataError> {
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hashset_tree::get_set(&self.roomid_usernames, room_id.as_bytes())
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}
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2020-11-06 21:52:49 +00:00
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pub fn add_user_to_room(&self, username: &str, room_id: &str) -> Result<(), DataError> {
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2020-11-10 20:18:00 +00:00
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debug!("Adding user {} to room {}", username, room_id);
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2020-11-07 14:37:56 +00:00
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(&self.username_roomids, &self.roomid_usernames).transaction(
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|(tx_username_rooms, tx_room_usernames)| {
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let username_key = &username.as_bytes();
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2020-11-09 21:14:37 +00:00
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hashset_tree::add_to_set(tx_username_rooms, username_key, room_id.to_owned())?;
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2020-11-07 14:37:56 +00:00
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let roomid_key = &room_id.as_bytes();
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hashset_tree::add_to_set(tx_room_usernames, roomid_key, username.to_owned())?;
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Ok(())
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},
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)?;
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2020-11-06 21:52:49 +00:00
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Ok(())
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}
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pub fn remove_user_from_room(&self, username: &str, room_id: &str) -> Result<(), DataError> {
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2020-11-10 20:18:00 +00:00
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debug!("Removing user {} from room {}", username, room_id);
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(&self.username_roomids, &self.roomid_usernames).transaction(
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|(tx_username_rooms, tx_room_usernames)| {
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let username_key = &username.as_bytes();
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2020-11-09 21:14:37 +00:00
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hashset_tree::remove_from_set(tx_username_rooms, username_key, room_id)?;
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2020-11-07 14:37:56 +00:00
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let roomid_key = &room_id.as_bytes();
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2020-11-09 21:14:37 +00:00
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hashset_tree::remove_from_set(tx_room_usernames, roomid_key, username)?;
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2020-11-07 14:37:56 +00:00
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Ok(())
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},
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)?;
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Ok(())
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}
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2020-11-07 20:47:49 +00:00
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pub fn clear_info(&self, room_id: &str) -> Result<(), DataError> {
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2020-11-10 20:18:00 +00:00
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debug!("Clearing all information for room {}", room_id);
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2020-11-07 20:47:49 +00:00
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(&self.username_roomids, &self.roomid_usernames).transaction(
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|(tx_username_roomids, tx_roomid_usernames)| {
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let roomid_key = room_id.as_bytes();
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2020-11-09 21:14:37 +00:00
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let users_in_room = hashset_tree::get_set(tx_roomid_usernames, roomid_key)?;
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2020-11-07 20:47:49 +00:00
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//Remove the room ID from every user's room ID list.
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for username in users_in_room {
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2020-11-09 21:14:37 +00:00
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hashset_tree::remove_from_set(
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tx_username_roomids,
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username.as_bytes(),
|
|
|
|
room_id,
|
|
|
|
)?;
|
2020-11-07 20:47:49 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
//Remove this room entry for the room ID -> username tree.
|
|
|
|
tx_roomid_usernames.remove(roomid_key)?;
|
|
|
|
|
|
|
|
//TODO: delete roominfo struct from room info tree.
|
|
|
|
Ok(())
|
|
|
|
},
|
|
|
|
)?;
|
|
|
|
|
2020-11-06 21:52:49 +00:00
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
}
|
2020-11-07 14:37:56 +00:00
|
|
|
|
|
|
|
#[cfg(test)]
|
|
|
|
mod tests {
|
|
|
|
use super::*;
|
|
|
|
use sled::Config;
|
|
|
|
|
|
|
|
fn create_test_instance() -> Rooms {
|
|
|
|
let config = Config::new().temporary(true);
|
|
|
|
let db = config.open().unwrap();
|
|
|
|
Rooms::new(&db).unwrap()
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn add_user_to_room() {
|
|
|
|
let rooms = create_test_instance();
|
2020-11-09 21:14:37 +00:00
|
|
|
|
2020-11-07 14:37:56 +00:00
|
|
|
rooms
|
|
|
|
.add_user_to_room("testuser", "myroom")
|
|
|
|
.expect("Could not add user to room");
|
|
|
|
|
|
|
|
let users_in_room = rooms
|
|
|
|
.get_users_in_room("myroom")
|
|
|
|
.expect("Could not retrieve users in room");
|
|
|
|
|
|
|
|
let rooms_for_user = rooms
|
|
|
|
.get_rooms_for_user("testuser")
|
|
|
|
.expect("Could not get rooms for user");
|
|
|
|
|
|
|
|
let expected_users_in_room: HashSet<String> =
|
|
|
|
vec![String::from("testuser")].into_iter().collect();
|
|
|
|
|
|
|
|
let expected_rooms_for_user: HashSet<String> =
|
|
|
|
vec![String::from("myroom")].into_iter().collect();
|
|
|
|
|
|
|
|
assert_eq!(expected_users_in_room, users_in_room);
|
|
|
|
assert_eq!(expected_rooms_for_user, rooms_for_user);
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn remove_user_from_room() {
|
|
|
|
let rooms = create_test_instance();
|
2020-11-09 21:14:37 +00:00
|
|
|
|
2020-11-07 14:37:56 +00:00
|
|
|
rooms
|
|
|
|
.add_user_to_room("testuser", "myroom")
|
|
|
|
.expect("Could not add user to room");
|
|
|
|
|
|
|
|
rooms
|
|
|
|
.remove_user_from_room("testuser", "myroom")
|
|
|
|
.expect("Could not remove user from room");
|
|
|
|
|
|
|
|
let users_in_room = rooms
|
|
|
|
.get_users_in_room("myroom")
|
|
|
|
.expect("Could not retrieve users in room");
|
|
|
|
|
|
|
|
let rooms_for_user = rooms
|
|
|
|
.get_rooms_for_user("testuser")
|
|
|
|
.expect("Could not get rooms for user");
|
|
|
|
|
|
|
|
assert_eq!(HashSet::new(), users_in_room);
|
|
|
|
assert_eq!(HashSet::new(), rooms_for_user);
|
|
|
|
}
|
2020-11-07 20:47:49 +00:00
|
|
|
|
2020-11-29 21:29:13 +00:00
|
|
|
#[test]
|
|
|
|
fn insert_room_info_works() {
|
|
|
|
let rooms = create_test_instance();
|
|
|
|
|
|
|
|
let info = RoomInfo {
|
|
|
|
room_id: matrix_sdk::identifiers::room_id!("!fakeroom:example.com")
|
|
|
|
.as_str()
|
|
|
|
.to_owned(),
|
|
|
|
room_name: "fake room name".to_owned(),
|
|
|
|
};
|
|
|
|
|
|
|
|
rooms
|
|
|
|
.insert_room_info(&info)
|
|
|
|
.expect("Could insert room info");
|
|
|
|
|
|
|
|
let found_info = rooms
|
|
|
|
.get_room_info("!fakeroom:example.com")
|
|
|
|
.expect("Error loading room info");
|
|
|
|
|
|
|
|
assert!(found_info.is_some());
|
|
|
|
assert_eq!(info, found_info.unwrap());
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn get_room_info_none_when_room_does_not_exist() {
|
|
|
|
let rooms = create_test_instance();
|
|
|
|
|
|
|
|
let found_info = rooms
|
|
|
|
.get_room_info("!fakeroom:example.com")
|
|
|
|
.expect("Error loading room info");
|
|
|
|
|
|
|
|
assert!(found_info.is_none());
|
|
|
|
}
|
|
|
|
|
2020-11-07 20:47:49 +00:00
|
|
|
#[test]
|
|
|
|
fn clear_info() {
|
|
|
|
let rooms = create_test_instance();
|
2020-11-09 21:14:37 +00:00
|
|
|
|
2020-11-07 20:47:49 +00:00
|
|
|
rooms
|
|
|
|
.add_user_to_room("testuser", "myroom1")
|
|
|
|
.expect("Could not add user to room1");
|
|
|
|
|
|
|
|
rooms
|
|
|
|
.add_user_to_room("testuser", "myroom2")
|
|
|
|
.expect("Could not add user to room2");
|
|
|
|
|
|
|
|
rooms
|
|
|
|
.clear_info("myroom1")
|
|
|
|
.expect("Could not clear room info");
|
|
|
|
|
|
|
|
let users_in_room1 = rooms
|
|
|
|
.get_users_in_room("myroom1")
|
|
|
|
.expect("Could not retrieve users in room1");
|
|
|
|
|
|
|
|
let users_in_room2 = rooms
|
|
|
|
.get_users_in_room("myroom2")
|
|
|
|
.expect("Could not retrieve users in room2");
|
|
|
|
|
|
|
|
let rooms_for_user = rooms
|
|
|
|
.get_rooms_for_user("testuser")
|
|
|
|
.expect("Could not get rooms for user");
|
|
|
|
|
|
|
|
let expected_users_in_room2: HashSet<String> =
|
|
|
|
vec![String::from("testuser")].into_iter().collect();
|
|
|
|
|
|
|
|
let expected_rooms_for_user: HashSet<String> =
|
|
|
|
vec![String::from("myroom2")].into_iter().collect();
|
|
|
|
|
|
|
|
assert_eq!(HashSet::new(), users_in_room1);
|
|
|
|
assert_eq!(expected_users_in_room2, users_in_room2);
|
|
|
|
assert_eq!(expected_rooms_for_user, rooms_for_user);
|
|
|
|
}
|
2020-11-09 21:14:37 +00:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn insert_to_timestamp_index() {
|
|
|
|
let rooms = create_test_instance();
|
|
|
|
|
|
|
|
// Insertion into timestamp index based on data that would go
|
|
|
|
// into main room x eventID -> timestamp tree.
|
|
|
|
let mut key = b"myroom".to_vec();
|
|
|
|
key.push(0xff);
|
|
|
|
key.extend_from_slice(b"myeventid");
|
|
|
|
|
|
|
|
let timestamp: U64<BigEndian> = U64::new(1000);
|
|
|
|
|
|
|
|
let result = timestamp_index::insert(
|
|
|
|
&rooms.roomtimestamp_eventid,
|
|
|
|
key.as_bytes(),
|
|
|
|
timestamp.as_bytes(),
|
|
|
|
);
|
|
|
|
|
|
|
|
assert!(result.is_ok());
|
|
|
|
|
|
|
|
// Retrieval of data from the timestamp index tree.
|
|
|
|
let mut ts_key = b"myroom".to_vec();
|
|
|
|
ts_key.push(0xff);
|
|
|
|
ts_key.extend_from_slice(timestamp.as_bytes());
|
|
|
|
|
|
|
|
let expected_events: HashSet<String> =
|
|
|
|
vec![String::from("myeventid")].into_iter().collect();
|
|
|
|
|
|
|
|
let event_ids = hashset_tree::get_set(&rooms.roomtimestamp_eventid, &ts_key)
|
|
|
|
.expect("Could not get set out of Tree");
|
|
|
|
assert_eq!(expected_events, event_ids);
|
|
|
|
}
|
2020-11-07 14:37:56 +00:00
|
|
|
}
|