Move the functions for reading room state to a separate package. (#29)
This should:
1) Make the input package a bit cleaner.
2) Allow use to reuse the state reading code from the query package.
This commit is contained in:
Mark Haines
GitHub
parent
84682b33c9
commit
1d18da1189
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@ -2,12 +2,14 @@ package input
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import (
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/state"
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"github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/gomatrixserverlib"
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)
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// A RoomEventDatabase has the storage APIs needed to store a room event.
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type RoomEventDatabase interface {
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state.RoomStateDatabase
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// Stores a matrix room event in the database
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StoreEvent(event gomatrixserverlib.Event, authEventNIDs []types.EventNID) (types.RoomNID, types.StateAtEvent, error)
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// Lookup the state entries for a list of string event IDs
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@ -24,12 +26,6 @@ type RoomEventDatabase interface {
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// Returns an error if there is an error talking to the database
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// or if the room state for the event IDs aren't in the database
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StateAtEventIDs(eventIDs []string) ([]types.StateAtEvent, error)
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// Lookup the numeric state data IDs for each numeric state snapshot ID
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// The returned slice is sorted by numeric state snapshot ID.
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StateBlockNIDs(stateNIDs []types.StateSnapshotNID) ([]types.StateBlockNIDList, error)
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// Lookup the state data for each numeric state data ID
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// The returned slice is sorted by numeric state data ID.
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StateEntries(stateBlockNIDs []types.StateBlockNID) ([]types.StateEntryList, error)
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// Store the room state at an event in the database
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AddState(roomNID types.RoomNID, stateBlockNIDs []types.StateBlockNID, state []types.StateEntry) (types.StateSnapshotNID, error)
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// Set the state at an event.
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@ -3,6 +3,7 @@ package input
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import (
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"bytes"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/state"
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"github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/gomatrixserverlib"
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)
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@ -90,7 +91,7 @@ func doUpdateLatestEvents(
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return err
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}
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removed, added, err := differenceBetweeenStateSnapshots(db, oldStateNID, newStateNID)
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removed, added, err := state.DifferenceBetweeenStateSnapshots(db, oldStateNID, newStateNID)
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if err != nil {
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return err
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}
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@ -2,10 +2,10 @@ package input
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import (
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"fmt"
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"github.com/matrix-org/dendrite/roomserver/state"
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"github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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"sort"
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)
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// calculateAndStoreState calculates a snapshot of the state of a room before an event.
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@ -81,7 +81,7 @@ const maxStateBlockNIDs = 64
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func calculateAndStoreStateAfterManyEvents(db RoomEventDatabase, roomNID types.RoomNID, prevStates []types.StateAtEvent) (types.StateSnapshotNID, error) {
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// Conflict resolution.
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// First stage: load the state after each of the prev events.
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combined, err := loadCombinedStateAfterEvents(db, prevStates)
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combined, err := state.LoadCombinedStateAfterEvents(db, prevStates)
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if err != nil {
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return 0, err
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}
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@ -114,169 +114,6 @@ func calculateAndStoreStateAfterManyEvents(db RoomEventDatabase, roomNID types.R
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return db.AddState(roomNID, nil, state)
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}
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// differenceBetweeenStateSnapshots works out which state entries have been added and removed between two snapshots.
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func differenceBetweeenStateSnapshots(db RoomEventDatabase, oldStateNID, newStateNID types.StateSnapshotNID) (
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removed, added []types.StateEntry, err error,
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) {
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if oldStateNID == newStateNID {
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// If the snapshot NIDs are the same then nothing has changed
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return nil, nil, nil
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}
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var oldEntries []types.StateEntry
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var newEntries []types.StateEntry
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if oldStateNID != 0 {
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oldEntries, err = loadStateAtSnapshot(db, oldStateNID)
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if err != nil {
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return nil, nil, err
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}
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}
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if newStateNID != 0 {
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newEntries, err = loadStateAtSnapshot(db, newStateNID)
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if err != nil {
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return nil, nil, err
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}
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}
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var oldI int
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var newI int
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for {
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switch {
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case oldI == len(oldEntries):
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// We've reached the end of the old entries.
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// The rest of the new list must have been newly added.
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added = append(added, newEntries[newI:]...)
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return
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case newI == len(newEntries):
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// We've reached the end of the new entries.
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// The rest of the old list must be have been removed.
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removed = append(removed, oldEntries[oldI:]...)
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return
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case oldEntries[oldI] == newEntries[newI]:
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// The entry is in both lists so skip over it.
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oldI++
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newI++
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case oldEntries[oldI].LessThan(newEntries[newI]):
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// The lists are sorted so the old entry being less than the new entry means that it only appears in the old list.
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removed = append(removed, oldEntries[oldI])
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oldI++
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default:
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// Reaching the default case implies that the new entry is less than the old entry.
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// Since the lists are sorted this means that it only appears in the new list.
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added = append(added, newEntries[newI])
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newI++
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}
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}
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}
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// loadStateAtSnapshot loads the full state of a room at a particular snapshot.
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// This is typically the state before an event or the current state of a room.
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// Returns a sorted list of state entries or an error if there was a problem talking to the database.
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func loadStateAtSnapshot(db RoomEventDatabase, stateNID types.StateSnapshotNID) ([]types.StateEntry, error) {
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stateBlockNIDLists, err := db.StateBlockNIDs([]types.StateSnapshotNID{stateNID})
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if err != nil {
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return nil, err
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}
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stateBlockNIDList := stateBlockNIDLists[0]
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stateEntryLists, err := db.StateEntries(stateBlockNIDList.StateBlockNIDs)
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if err != nil {
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return nil, err
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}
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stateEntriesMap := stateEntryListMap(stateEntryLists)
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// Combined all the state entries for this snapshot.
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// The order of state block NIDs in the list tells us the order to combine them in.
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var fullState []types.StateEntry
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for _, stateBlockNID := range stateBlockNIDList.StateBlockNIDs {
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entries, ok := stateEntriesMap.lookup(stateBlockNID)
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if !ok {
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// This should only get hit if the database is corrupt.
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// It should be impossible for an event to reference a NID that doesn't exist
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panic(fmt.Errorf("Corrupt DB: Missing state block numeric ID %d", stateBlockNID))
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}
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fullState = append(fullState, entries...)
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}
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// Stable sort so that the most recent entry for each state key stays
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// remains later in the list than the older entries for the same state key.
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sort.Stable(stateEntryByStateKeySorter(fullState))
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// Unique returns the last entry and hence the most recent entry for each state key.
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fullState = fullState[:util.Unique(stateEntryByStateKeySorter(fullState))]
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return fullState, nil
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}
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// loadCombinedStateAfterEvents loads a snapshot of the state after each of the events
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// and combines those snapshots together into a single list.
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func loadCombinedStateAfterEvents(db RoomEventDatabase, prevStates []types.StateAtEvent) ([]types.StateEntry, error) {
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stateNIDs := make([]types.StateSnapshotNID, len(prevStates))
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for i, state := range prevStates {
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stateNIDs[i] = state.BeforeStateSnapshotNID
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}
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// Fetch the state snapshots for the state before the each prev event from the database.
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// Deduplicate the IDs before passing them to the database.
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// There could be duplicates because the events could be state events where
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// the snapshot of the room state before them was the same.
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stateBlockNIDLists, err := db.StateBlockNIDs(uniqueStateSnapshotNIDs(stateNIDs))
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if err != nil {
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return nil, err
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}
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var stateBlockNIDs []types.StateBlockNID
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for _, list := range stateBlockNIDLists {
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stateBlockNIDs = append(stateBlockNIDs, list.StateBlockNIDs...)
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}
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// Fetch the state entries that will be combined to create the snapshots.
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// Deduplicate the IDs before passing them to the database.
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// There could be duplicates because a block of state entries could be reused by
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// multiple snapshots.
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stateEntryLists, err := db.StateEntries(uniqueStateBlockNIDs(stateBlockNIDs))
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if err != nil {
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return nil, err
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}
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stateBlockNIDsMap := stateBlockNIDListMap(stateBlockNIDLists)
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stateEntriesMap := stateEntryListMap(stateEntryLists)
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// Combine the entries from all the snapshots of state after each prev event into a single list.
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var combined []types.StateEntry
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for _, prevState := range prevStates {
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// Grab the list of state data NIDs for this snapshot.
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stateBlockNIDs, ok := stateBlockNIDsMap.lookup(prevState.BeforeStateSnapshotNID)
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if !ok {
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// This should only get hit if the database is corrupt.
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// It should be impossible for an event to reference a NID that doesn't exist
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panic(fmt.Errorf("Corrupt DB: Missing state snapshot numeric ID %d", prevState.BeforeStateSnapshotNID))
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}
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// Combined all the state entries for this snapshot.
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// The order of state block NIDs in the list tells us the order to combine them in.
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var fullState []types.StateEntry
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for _, stateBlockNID := range stateBlockNIDs {
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entries, ok := stateEntriesMap.lookup(stateBlockNID)
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if !ok {
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// This should only get hit if the database is corrupt.
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// It should be impossible for an event to reference a NID that doesn't exist
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panic(fmt.Errorf("Corrupt DB: Missing state block numeric ID %d", stateBlockNID))
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}
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fullState = append(fullState, entries...)
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}
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if prevState.IsStateEvent() {
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// If the prev event was a state event then add an entry for the event itself
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// so that we get the state after the event rather than the state before.
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fullState = append(fullState, prevState.StateEntry)
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}
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// Stable sort so that the most recent entry for each state key stays
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// remains later in the list than the older entries for the same state key.
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sort.Stable(stateEntryByStateKeySorter(fullState))
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// Unique returns the last entry and hence the most recent entry for each state key.
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fullState = fullState[:util.Unique(stateEntryByStateKeySorter(fullState))]
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// Add the full state for this StateSnapshotNID.
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combined = append(combined, fullState...)
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}
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return combined, nil
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}
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func resolveConflicts(db RoomEventDatabase, combined, conflicted []types.StateEntry) ([]types.StateEntry, error) {
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panic(fmt.Errorf("Not implemented"))
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}
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@ -308,64 +145,8 @@ func findDuplicateStateKeys(a []types.StateEntry) []types.StateEntry {
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return result
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}
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type stateBlockNIDListMap []types.StateBlockNIDList
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func (m stateBlockNIDListMap) lookup(stateNID types.StateSnapshotNID) (stateBlockNIDs []types.StateBlockNID, ok bool) {
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list := []types.StateBlockNIDList(m)
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i := sort.Search(len(list), func(i int) bool {
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return list[i].StateSnapshotNID >= stateNID
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})
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if i < len(list) && list[i].StateSnapshotNID == stateNID {
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ok = true
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stateBlockNIDs = list[i].StateBlockNIDs
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}
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return
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}
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type stateEntryListMap []types.StateEntryList
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func (m stateEntryListMap) lookup(stateBlockNID types.StateBlockNID) (stateEntries []types.StateEntry, ok bool) {
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list := []types.StateEntryList(m)
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i := sort.Search(len(list), func(i int) bool {
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return list[i].StateBlockNID >= stateBlockNID
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})
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if i < len(list) && list[i].StateBlockNID == stateBlockNID {
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ok = true
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stateEntries = list[i].StateEntries
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}
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return
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}
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type stateEntryByStateKeySorter []types.StateEntry
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func (s stateEntryByStateKeySorter) Len() int { return len(s) }
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func (s stateEntryByStateKeySorter) Less(i, j int) bool {
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return s[i].StateKeyTuple.LessThan(s[j].StateKeyTuple)
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}
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func (s stateEntryByStateKeySorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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type stateEntrySorter []types.StateEntry
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func (s stateEntrySorter) Len() int { return len(s) }
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func (s stateEntrySorter) Less(i, j int) bool { return s[i].LessThan(s[j]) }
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func (s stateEntrySorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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type stateNIDSorter []types.StateSnapshotNID
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func (s stateNIDSorter) Len() int { return len(s) }
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func (s stateNIDSorter) Less(i, j int) bool { return s[i] < s[j] }
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func (s stateNIDSorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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func uniqueStateSnapshotNIDs(nids []types.StateSnapshotNID) []types.StateSnapshotNID {
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return nids[:util.SortAndUnique(stateNIDSorter(nids))]
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}
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type stateBlockNIDSorter []types.StateBlockNID
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func (s stateBlockNIDSorter) Len() int { return len(s) }
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func (s stateBlockNIDSorter) Less(i, j int) bool { return s[i] < s[j] }
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func (s stateBlockNIDSorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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func uniqueStateBlockNIDs(nids []types.StateBlockNID) []types.StateBlockNID {
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return nids[:util.SortAndUnique(stateBlockNIDSorter(nids))]
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}
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@ -0,0 +1,239 @@
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// Package state provides functions for reading state from the database.
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// The functions for writing state to the database are the input package.
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package state
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import (
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"fmt"
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"github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/util"
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"sort"
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)
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// A RoomStateDatabase has the storage APIs needed to load state from the database
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type RoomStateDatabase interface {
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// Lookup the numeric state data IDs for each numeric state snapshot ID
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// The returned slice is sorted by numeric state snapshot ID.
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StateBlockNIDs(stateNIDs []types.StateSnapshotNID) ([]types.StateBlockNIDList, error)
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// Lookup the state data for each numeric state data ID
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// The returned slice is sorted by numeric state data ID.
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StateEntries(stateBlockNIDs []types.StateBlockNID) ([]types.StateEntryList, error)
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}
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// LoadStateAtSnapshot loads the full state of a room at a particular snapshot.
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// This is typically the state before an event or the current state of a room.
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// Returns a sorted list of state entries or an error if there was a problem talking to the database.
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func LoadStateAtSnapshot(db RoomStateDatabase, stateNID types.StateSnapshotNID) ([]types.StateEntry, error) {
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stateBlockNIDLists, err := db.StateBlockNIDs([]types.StateSnapshotNID{stateNID})
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if err != nil {
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return nil, err
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}
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stateBlockNIDList := stateBlockNIDLists[0]
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stateEntryLists, err := db.StateEntries(stateBlockNIDList.StateBlockNIDs)
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if err != nil {
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return nil, err
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}
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stateEntriesMap := stateEntryListMap(stateEntryLists)
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// Combined all the state entries for this snapshot.
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// The order of state block NIDs in the list tells us the order to combine them in.
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var fullState []types.StateEntry
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for _, stateBlockNID := range stateBlockNIDList.StateBlockNIDs {
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entries, ok := stateEntriesMap.lookup(stateBlockNID)
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if !ok {
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// This should only get hit if the database is corrupt.
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// It should be impossible for an event to reference a NID that doesn't exist
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panic(fmt.Errorf("Corrupt DB: Missing state block numeric ID %d", stateBlockNID))
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}
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fullState = append(fullState, entries...)
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}
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// Stable sort so that the most recent entry for each state key stays
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// remains later in the list than the older entries for the same state key.
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sort.Stable(stateEntryByStateKeySorter(fullState))
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// Unique returns the last entry and hence the most recent entry for each state key.
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fullState = fullState[:util.Unique(stateEntryByStateKeySorter(fullState))]
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return fullState, nil
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}
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// LoadCombinedStateAfterEvents loads a snapshot of the state after each of the events
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// and combines those snapshots together into a single list.
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func LoadCombinedStateAfterEvents(db RoomStateDatabase, prevStates []types.StateAtEvent) ([]types.StateEntry, error) {
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stateNIDs := make([]types.StateSnapshotNID, len(prevStates))
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for i, state := range prevStates {
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stateNIDs[i] = state.BeforeStateSnapshotNID
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}
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// Fetch the state snapshots for the state before the each prev event from the database.
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// Deduplicate the IDs before passing them to the database.
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// There could be duplicates because the events could be state events where
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// the snapshot of the room state before them was the same.
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stateBlockNIDLists, err := db.StateBlockNIDs(uniqueStateSnapshotNIDs(stateNIDs))
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if err != nil {
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return nil, err
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}
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var stateBlockNIDs []types.StateBlockNID
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for _, list := range stateBlockNIDLists {
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stateBlockNIDs = append(stateBlockNIDs, list.StateBlockNIDs...)
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}
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// Fetch the state entries that will be combined to create the snapshots.
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// Deduplicate the IDs before passing them to the database.
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// There could be duplicates because a block of state entries could be reused by
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// multiple snapshots.
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stateEntryLists, err := db.StateEntries(uniqueStateBlockNIDs(stateBlockNIDs))
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if err != nil {
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return nil, err
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}
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stateBlockNIDsMap := stateBlockNIDListMap(stateBlockNIDLists)
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stateEntriesMap := stateEntryListMap(stateEntryLists)
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// Combine the entries from all the snapshots of state after each prev event into a single list.
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var combined []types.StateEntry
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for _, prevState := range prevStates {
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// Grab the list of state data NIDs for this snapshot.
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stateBlockNIDs, ok := stateBlockNIDsMap.lookup(prevState.BeforeStateSnapshotNID)
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if !ok {
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// This should only get hit if the database is corrupt.
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// It should be impossible for an event to reference a NID that doesn't exist
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panic(fmt.Errorf("Corrupt DB: Missing state snapshot numeric ID %d", prevState.BeforeStateSnapshotNID))
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}
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// Combined all the state entries for this snapshot.
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// The order of state block NIDs in the list tells us the order to combine them in.
|
||||
var fullState []types.StateEntry
|
||||
for _, stateBlockNID := range stateBlockNIDs {
|
||||
entries, ok := stateEntriesMap.lookup(stateBlockNID)
|
||||
if !ok {
|
||||
// This should only get hit if the database is corrupt.
|
||||
// It should be impossible for an event to reference a NID that doesn't exist
|
||||
panic(fmt.Errorf("Corrupt DB: Missing state block numeric ID %d", stateBlockNID))
|
||||
}
|
||||
fullState = append(fullState, entries...)
|
||||
}
|
||||
if prevState.IsStateEvent() {
|
||||
// If the prev event was a state event then add an entry for the event itself
|
||||
// so that we get the state after the event rather than the state before.
|
||||
fullState = append(fullState, prevState.StateEntry)
|
||||
}
|
||||
|
||||
// Stable sort so that the most recent entry for each state key stays
|
||||
// remains later in the list than the older entries for the same state key.
|
||||
sort.Stable(stateEntryByStateKeySorter(fullState))
|
||||
// Unique returns the last entry and hence the most recent entry for each state key.
|
||||
fullState = fullState[:util.Unique(stateEntryByStateKeySorter(fullState))]
|
||||
// Add the full state for this StateSnapshotNID.
|
||||
combined = append(combined, fullState...)
|
||||
}
|
||||
return combined, nil
|
||||
}
|
||||
|
||||
// DifferenceBetweeenStateSnapshots works out which state entries have been added and removed between two snapshots.
|
||||
func DifferenceBetweeenStateSnapshots(db RoomStateDatabase, oldStateNID, newStateNID types.StateSnapshotNID) (
|
||||
removed, added []types.StateEntry, err error,
|
||||
) {
|
||||
if oldStateNID == newStateNID {
|
||||
// If the snapshot NIDs are the same then nothing has changed
|
||||
return nil, nil, nil
|
||||
}
|
||||
|
||||
var oldEntries []types.StateEntry
|
||||
var newEntries []types.StateEntry
|
||||
if oldStateNID != 0 {
|
||||
oldEntries, err = LoadStateAtSnapshot(db, oldStateNID)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
}
|
||||
if newStateNID != 0 {
|
||||
newEntries, err = LoadStateAtSnapshot(db, newStateNID)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
}
|
||||
|
||||
var oldI int
|
||||
var newI int
|
||||
for {
|
||||
switch {
|
||||
case oldI == len(oldEntries):
|
||||
// We've reached the end of the old entries.
|
||||
// The rest of the new list must have been newly added.
|
||||
added = append(added, newEntries[newI:]...)
|
||||
return
|
||||
case newI == len(newEntries):
|
||||
// We've reached the end of the new entries.
|
||||
// The rest of the old list must be have been removed.
|
||||
removed = append(removed, oldEntries[oldI:]...)
|
||||
return
|
||||
case oldEntries[oldI] == newEntries[newI]:
|
||||
// The entry is in both lists so skip over it.
|
||||
oldI++
|
||||
newI++
|
||||
case oldEntries[oldI].LessThan(newEntries[newI]):
|
||||
// The lists are sorted so the old entry being less than the new entry means that it only appears in the old list.
|
||||
removed = append(removed, oldEntries[oldI])
|
||||
oldI++
|
||||
default:
|
||||
// Reaching the default case implies that the new entry is less than the old entry.
|
||||
// Since the lists are sorted this means that it only appears in the new list.
|
||||
added = append(added, newEntries[newI])
|
||||
newI++
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
type stateBlockNIDListMap []types.StateBlockNIDList
|
||||
|
||||
func (m stateBlockNIDListMap) lookup(stateNID types.StateSnapshotNID) (stateBlockNIDs []types.StateBlockNID, ok bool) {
|
||||
list := []types.StateBlockNIDList(m)
|
||||
i := sort.Search(len(list), func(i int) bool {
|
||||
return list[i].StateSnapshotNID >= stateNID
|
||||
})
|
||||
if i < len(list) && list[i].StateSnapshotNID == stateNID {
|
||||
ok = true
|
||||
stateBlockNIDs = list[i].StateBlockNIDs
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
type stateEntryListMap []types.StateEntryList
|
||||
|
||||
func (m stateEntryListMap) lookup(stateBlockNID types.StateBlockNID) (stateEntries []types.StateEntry, ok bool) {
|
||||
list := []types.StateEntryList(m)
|
||||
i := sort.Search(len(list), func(i int) bool {
|
||||
return list[i].StateBlockNID >= stateBlockNID
|
||||
})
|
||||
if i < len(list) && list[i].StateBlockNID == stateBlockNID {
|
||||
ok = true
|
||||
stateEntries = list[i].StateEntries
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
type stateEntryByStateKeySorter []types.StateEntry
|
||||
|
||||
func (s stateEntryByStateKeySorter) Len() int { return len(s) }
|
||||
func (s stateEntryByStateKeySorter) Less(i, j int) bool {
|
||||
return s[i].StateKeyTuple.LessThan(s[j].StateKeyTuple)
|
||||
}
|
||||
func (s stateEntryByStateKeySorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
||||
|
||||
type stateNIDSorter []types.StateSnapshotNID
|
||||
|
||||
func (s stateNIDSorter) Len() int { return len(s) }
|
||||
func (s stateNIDSorter) Less(i, j int) bool { return s[i] < s[j] }
|
||||
func (s stateNIDSorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
||||
|
||||
func uniqueStateSnapshotNIDs(nids []types.StateSnapshotNID) []types.StateSnapshotNID {
|
||||
return nids[:util.SortAndUnique(stateNIDSorter(nids))]
|
||||
}
|
||||
|
||||
type stateBlockNIDSorter []types.StateBlockNID
|
||||
|
||||
func (s stateBlockNIDSorter) Len() int { return len(s) }
|
||||
func (s stateBlockNIDSorter) Less(i, j int) bool { return s[i] < s[j] }
|
||||
func (s stateBlockNIDSorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
||||
|
||||
func uniqueStateBlockNIDs(nids []types.StateBlockNID) []types.StateBlockNID {
|
||||
return nids[:util.SortAndUnique(stateBlockNIDSorter(nids))]
|
||||
}
|
||||
Loading…
Reference in New Issue