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Use Vec<u8> instead of string for digest bytes and add roomid_statehash

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This commit is contained in:
Devin Ragotzy 2020-08-19 19:29:39 -04:00
parent d73c6aa8ad
commit 64fb0374b6
1 changed files with 17 additions and 22 deletions
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39
src/database/rooms.rs
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@ -33,7 +33,7 @@ use std::{
///
/// This is created when a state group is added to the database by
/// hashing the entire state.
pub type StateHashId = String;
pub type StateHashId = Vec<u8>;
/// This identifier consists of roomId + count. It represents a
/// unique event, it will never be overwritten or removed.
@ -100,7 +100,7 @@ impl Rooms {
/// with `state_hash`, this gives the full state at event "x".
pub fn get_statemap_by_hash(&self, state_hash: StateHashId) -> Result<StateMap<EventId>> {
self.stateid_pduid
.scan_prefix(state_hash.as_bytes())
.scan_prefix(&state_hash)
.values()
.map(|pduid| {
self.pduid_pdu.get(&pduid?)?.map_or_else(
@ -123,12 +123,12 @@ impl Rooms {
pub fn prev_state_hash(&self, current: StateHashId) -> Option<StateHashId> {
let mut found = false;
for pair in self.pduid_statehash.iter().rev() {
let prev = utils::string_from_bytes(&pair.ok()?.1).ok()?;
if current == prev {
let prev = pair.ok()?.1;
if current == prev.as_ref() {
found = true;
}
if current != prev && found {
return Some(prev);
if current != prev.as_ref() && found {
return Some(prev.to_vec());
}
}
None
@ -172,17 +172,14 @@ impl Rooms {
// We must check here because this method is called outside and before
// `append_state_pdu` so the DB can be empty
if self.pduid_statehash.scan_prefix(prefix).next().is_none() {
// TODO use ring crate to hash
return Ok(room_id.as_str().to_owned());
// return the hash of the room_id, this represents a room with no state
return self.new_state_hash_id(room_id);
}
self.pduid_statehash
.iter()
.next_back()
.map(|pair| {
utils::string_from_bytes(&pair?.1)
.map_err(|_| Error::bad_database("Invalid state hash string in db."))
})
.map(|pair| Ok(pair?.1.to_vec()))
.ok_or_else(|| Error::bad_database("No PDU's found for this room."))?
}
@ -255,10 +252,9 @@ impl Rooms {
.next()
.is_none()
{
return utils::string_from_bytes(
digest::digest(&digest::SHA256, room_id.as_bytes()).as_ref(),
)
.map_err(|_| Error::bad_database("Empty state generated invalid string from hash."));
return Ok(digest::digest(&digest::SHA256, room_id.as_bytes())
.as_ref()
.to_vec());
}
let pdu_ids_to_hash = self
@ -280,9 +276,7 @@ impl Rooms {
&digest::SHA256,
&pdu_ids_to_hash.into_iter().flatten().collect::<Vec<u8>>(),
);
// TODO not sure how you want to hash this
utils::string_from_bytes(hash.as_ref())
.map_err(|_| Error::bad_database("State generated invalid string from hash."))
Ok(hash.as_ref().to_vec())
}
/// Checks if a room exists.
@ -604,7 +598,7 @@ impl Rooms {
let state_hash = self.new_state_hash_id(room_id)?;
let state = self.current_state_pduids(room_id)?;
let mut key = state_hash.as_bytes().to_vec();
let mut key = state_hash.to_vec();
key.push(0xff);
// TODO eventually we could avoid writing to the DB so much on every event
@ -622,9 +616,10 @@ impl Rooms {
// This event's state does not include the event itself. `current_state_pduids`
// uses `roomstateid_pduid` before the current event is inserted to the tree so the state
// will be everything up to but not including the incoming event.
self.pduid_statehash.insert(pdu_id, state_hash.as_bytes())?;
self.pduid_statehash.insert(pdu_id, state_hash.as_slice())?;
self.roomid_statehash.insert(room_id.as_bytes(), state_hash.as_bytes())?;
self.roomid_statehash
.insert(room_id.as_bytes(), state_hash.as_slice())?;
let mut key = room_id.as_bytes().to_vec();
key.push(0xff);