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Resolve over old and new extremities (#2457)

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* Feed existing state into state res when calculating state from new extremities

* Remove duplicates

* Fix bug

* Sort and unique

* Update to matrix-org/gomatrixserverlib#308

* Trim the slice properly

* Update gomatrixserverlib again

* Update to matrix-org/gomatrixserverlib#308
This commit is contained in:
Neil Alexander 2022-05-13 11:52:04 +01:00 committed by GitHub
parent cafc2d2c10
commit be9be2553f
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4 changed files with 31 additions and 9 deletions
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2
go.mod
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@ -30,7 +30,7 @@ require (
github.com/matrix-org/dugong v0.0.0-20210921133753-66e6b1c67e2e
github.com/matrix-org/go-sqlite3-js v0.0.0-20220419092513-28aa791a1c91
github.com/matrix-org/gomatrix v0.0.0-20210324163249-be2af5ef2e16
github.com/matrix-org/gomatrixserverlib v0.0.0-20220509120958-8d818048c34c
github.com/matrix-org/gomatrixserverlib v0.0.0-20220513103617-eee8fd528433
github.com/matrix-org/pinecone v0.0.0-20220408153826-2999ea29ed48
github.com/matrix-org/util v0.0.0-20200807132607-55161520e1d4
github.com/mattn/go-sqlite3 v1.14.10

4
go.sum
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@ -795,8 +795,8 @@ github.com/matrix-org/go-sqlite3-js v0.0.0-20220419092513-28aa791a1c91/go.mod h1
github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26/go.mod h1:3fxX6gUjWyI/2Bt7J1OLhpCzOfO/bB3AiX0cJtEKud0=
github.com/matrix-org/gomatrix v0.0.0-20210324163249-be2af5ef2e16 h1:ZtO5uywdd5dLDCud4r0r55eP4j9FuUNpl60Gmntcop4=
github.com/matrix-org/gomatrix v0.0.0-20210324163249-be2af5ef2e16/go.mod h1:/gBX06Kw0exX1HrwmoBibFA98yBk/jxKpGVeyQbff+s=
github.com/matrix-org/gomatrixserverlib v0.0.0-20220509120958-8d818048c34c h1:KqzqFWxvs90pcDaW9QEveW+Q5JcEYuNnKyaqXc+ohno=
github.com/matrix-org/gomatrixserverlib v0.0.0-20220509120958-8d818048c34c/go.mod h1:V5eO8rn/C3rcxig37A/BCeKerLFS+9Avg/77FIeTZ48=
github.com/matrix-org/gomatrixserverlib v0.0.0-20220513103617-eee8fd528433 h1:nwAlThHGPI2EAAJklXvgMcdhXF6ZiHp60+fmaYMoaDA=
github.com/matrix-org/gomatrixserverlib v0.0.0-20220513103617-eee8fd528433/go.mod h1:V5eO8rn/C3rcxig37A/BCeKerLFS+9Avg/77FIeTZ48=
github.com/matrix-org/pinecone v0.0.0-20220408153826-2999ea29ed48 h1:W0sjjC6yjskHX4mb0nk3p0fXAlbU5bAFUFeEtlrPASE=
github.com/matrix-org/pinecone v0.0.0-20220408153826-2999ea29ed48/go.mod h1:ulJzsVOTssIVp1j/m5eI//4VpAGDkMt5NrRuAVX7wpc=
github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7/go.mod h1:vVQlW/emklohkZnOPwD3LrZUBqdfsbiyO3p1lNV8F6U=

19
roomserver/internal/input/input_latest_events.go
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@ -233,12 +233,19 @@ func (u *latestEventsUpdater) latestState() error {
}
}
// Get a list of the current latest events. This may or may not
// include the new event from the input path, depending on whether
// it is a forward extremity or not.
latestStateAtEvents := make([]types.StateAtEvent, len(u.latest))
for i := range u.latest {
latestStateAtEvents[i] = u.latest[i].StateAtEvent
// Take the old set of extremities and the new set of extremities and
// mash them together into a list. This may or may not include the new event
// from the input path, depending on whether it became a forward extremity
// or not. We'll then run state resolution across all of them to determine
// the new current state of the room. Including the old extremities here
// ensures that new forward extremities with bad state snapshots (from
// possible malicious actors) can't completely corrupt the room state
// away from what it was before.
combinedExtremities := types.StateAtEventAndReferences(append(u.oldLatest, u.latest...))
combinedExtremities = combinedExtremities[:util.SortAndUnique(combinedExtremities)]
latestStateAtEvents := make([]types.StateAtEvent, len(combinedExtremities))
for i := range combinedExtremities {
latestStateAtEvents[i] = combinedExtremities[i].StateAtEvent
}
// Takes the NIDs of the latest events and creates a state snapshot

15
roomserver/types/types.go
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@ -18,6 +18,7 @@ package types
import (
"encoding/json"
"sort"
"strings"
"github.com/matrix-org/gomatrixserverlib"
"golang.org/x/crypto/blake2b"
@ -166,6 +167,20 @@ type StateAtEventAndReference struct {
gomatrixserverlib.EventReference
}
type StateAtEventAndReferences []StateAtEventAndReference
func (s StateAtEventAndReferences) Less(a, b int) bool {
return strings.Compare(s[a].EventID, s[b].EventID) < 0
}
func (s StateAtEventAndReferences) Len() int {
return len(s)
}
func (s StateAtEventAndReferences) Swap(a, b int) {
s[a], s[b] = s[b], s[a]
}
// An Event is a gomatrixserverlib.Event with the numeric event ID attached.
// It is when performing bulk event lookup in the database.
type Event struct {