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package main
import (
"context"
"flag"
"fmt"
"os"
"strconv"
"github.com/matrix-org/dendrite/internal/caching"
"github.com/matrix-org/dendrite/roomserver/storage"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/dendrite/setup"
"github.com/matrix-org/gomatrixserverlib"
)
// This is a utility for inspecting state snapshots and running state resolution
// against real snapshots in an actual database.
// It takes one or more state snapshot NIDs as arguments, along with a room version
// to use for unmarshalling events, and will produce resolved output.
//
// Usage: ./resolve-state --roomversion=version snapshot [snapshot ...]
// e.g. ./resolve-state --roomversion=5 1254 1235 1282
var roomVersion = flag.String("roomversion", "5", "the room version to parse events as")
func main() {
ctx := context.Background()
cfg := setup.ParseFlags(true)
args := os.Args[1:]
fmt.Println("Room version", *roomVersion)
snapshotNIDs := []types.StateSnapshotNID{}
for _, arg := range args {
if i, err := strconv.Atoi(arg); err == nil {
snapshotNIDs = append(snapshotNIDs, types.StateSnapshotNID(i))
}
}
fmt.Println("Fetching", len(snapshotNIDs), "snapshot NIDs")
cache, err := caching.NewInMemoryLRUCache(true)
if err != nil {
panic(err)
}
roomserverDB, err := storage.Open(nil, &cfg.RoomServer.Database, cache)
if err != nil {
panic(err)
}
blockNIDs, err := roomserverDB.StateBlockNIDs(ctx, snapshotNIDs)
if err != nil {
panic(err)
}
var stateEntries []types.StateEntryList
for _, list := range blockNIDs {
entries, err2 := roomserverDB.StateEntries(ctx, list.StateBlockNIDs)
if err2 != nil {
panic(err2)
}
stateEntries = append(stateEntries, entries...)
}
var eventNIDs []types.EventNID
for _, entry := range stateEntries {
for _, e := range entry.StateEntries {
eventNIDs = append(eventNIDs, e.EventNID)
}
}
fmt.Println("Fetching", len(eventNIDs), "state events")
eventEntries, err := roomserverDB.Events(ctx, eventNIDs)
if err != nil {
panic(err)
}
authEventIDMap := make(map[string]struct{})
events := make([]*gomatrixserverlib.Event, len(eventEntries))
for i := range eventEntries {
events[i] = eventEntries[i].Event
for _, authEventID := range eventEntries[i].AuthEventIDs() {
authEventIDMap[authEventID] = struct{}{}
}
}
authEventIDs := make([]string, 0, len(authEventIDMap))
for authEventID := range authEventIDMap {
authEventIDs = append(authEventIDs, authEventID)
}
fmt.Println("Fetching", len(authEventIDs), "auth events")
authEventEntries, err := roomserverDB.EventsFromIDs(ctx, authEventIDs)
if err != nil {
panic(err)
}
authEvents := make([]*gomatrixserverlib.Event, len(authEventEntries))
for i := range authEventEntries {
authEvents[i] = authEventEntries[i].Event
}
fmt.Println("Resolving state")
resolved, err := gomatrixserverlib.ResolveConflicts(
gomatrixserverlib.RoomVersion(*roomVersion),
events,
authEvents,
)
if err != nil {
panic(err)
}
fmt.Println("Resolved state contains", len(resolved), "events")
for _, event := range resolved {
fmt.Println()
fmt.Printf("* %s %s %q\n", event.EventID(), event.Type(), *event.StateKey())
fmt.Printf(" %s\n", string(event.Content()))
}
}
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