conduit/src/database/account_data.rs

154 lines
5.2 KiB
Rust

use crate::{utils, Error, Result};
use ruma::{
api::client::error::ErrorKind,
events::{AnyEphemeralRoomEvent, EventType},
serde::Raw,
RoomId, UserId,
};
use serde::{de::DeserializeOwned, Serialize};
use std::{collections::HashMap, convert::TryFrom, sync::Arc};
use super::abstraction::Tree;
pub struct AccountData {
pub(super) roomuserdataid_accountdata: Arc<dyn Tree>, // RoomUserDataId = Room + User + Count + Type
pub(super) roomusertype_roomuserdataid: Arc<dyn Tree>, // RoomUserType = Room + User + Type
}
impl AccountData {
/// Places one event in the account data of the user and removes the previous entry.
#[tracing::instrument(skip(self, room_id, user_id, event_type, data, globals))]
pub fn update<T: Serialize>(
&self,
room_id: Option<&RoomId>,
user_id: &UserId,
event_type: EventType,
data: &T,
globals: &super::globals::Globals,
) -> Result<()> {
let mut prefix = room_id
.map(|r| r.to_string())
.unwrap_or_default()
.as_bytes()
.to_vec();
prefix.push(0xff);
prefix.extend_from_slice(&user_id.as_bytes());
prefix.push(0xff);
let mut roomuserdataid = prefix.clone();
roomuserdataid.extend_from_slice(&globals.next_count()?.to_be_bytes());
roomuserdataid.push(0xff);
roomuserdataid.extend_from_slice(&event_type.as_bytes());
let mut key = prefix.clone();
key.extend_from_slice(event_type.as_bytes());
let json = serde_json::to_value(data).expect("all types here can be serialized"); // TODO: maybe add error handling
if json.get("type").is_none() || json.get("content").is_none() {
return Err(Error::BadRequest(
ErrorKind::InvalidParam,
"Account data doesn't have all required fields.",
));
}
self.roomuserdataid_accountdata.insert(
&roomuserdataid,
&serde_json::to_vec(&json).expect("to_vec always works on json values"),
)?;
let prev = self.roomusertype_roomuserdataid.get(&key)?;
self.roomusertype_roomuserdataid
.insert(&key, &roomuserdataid)?;
// Remove old entry
if let Some(prev) = prev {
self.roomuserdataid_accountdata.remove(&prev)?;
}
Ok(())
}
/// Searches the account data for a specific kind.
#[tracing::instrument(skip(self, room_id, user_id, kind))]
pub fn get<T: DeserializeOwned>(
&self,
room_id: Option<&RoomId>,
user_id: &UserId,
kind: EventType,
) -> Result<Option<T>> {
let mut key = room_id
.map(|r| r.to_string())
.unwrap_or_default()
.as_bytes()
.to_vec();
key.push(0xff);
key.extend_from_slice(&user_id.as_bytes());
key.push(0xff);
key.extend_from_slice(kind.as_ref().as_bytes());
self.roomusertype_roomuserdataid
.get(&key)?
.and_then(|roomuserdataid| {
self.roomuserdataid_accountdata
.get(&roomuserdataid)
.transpose()
})
.transpose()?
.map(|data| {
serde_json::from_slice(&data)
.map_err(|_| Error::bad_database("could not deserialize"))
})
.transpose()
}
/// Returns all changes to the account data that happened after `since`.
#[tracing::instrument(skip(self, room_id, user_id, since))]
pub fn changes_since(
&self,
room_id: Option<&RoomId>,
user_id: &UserId,
since: u64,
) -> Result<HashMap<EventType, Raw<AnyEphemeralRoomEvent>>> {
let mut userdata = HashMap::new();
let mut prefix = room_id
.map(|r| r.to_string())
.unwrap_or_default()
.as_bytes()
.to_vec();
prefix.push(0xff);
prefix.extend_from_slice(&user_id.as_bytes());
prefix.push(0xff);
// Skip the data that's exactly at since, because we sent that last time
let mut first_possible = prefix.clone();
first_possible.extend_from_slice(&(since + 1).to_be_bytes());
for r in self
.roomuserdataid_accountdata
.iter_from(&first_possible, false)
.take_while(move |(k, _)| k.starts_with(&prefix))
.map(|(k, v)| {
Ok::<_, Error>((
EventType::try_from(
utils::string_from_bytes(k.rsplit(|&b| b == 0xff).next().ok_or_else(
|| Error::bad_database("RoomUserData ID in db is invalid."),
)?)
.map_err(|_| Error::bad_database("RoomUserData ID in db is invalid."))?,
)
.map_err(|_| Error::bad_database("RoomUserData ID in db is invalid."))?,
serde_json::from_slice::<Raw<AnyEphemeralRoomEvent>>(&v).map_err(|_| {
Error::bad_database("Database contains invalid account data.")
})?,
))
})
{
let (kind, data) = r?;
userdata.insert(kind, data);
}
Ok(userdata)
}
}