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Add device list updater which manages updating remote device lists (#1242)
* Add device list updater which manages updating remote device lists - Doesn't persist stale lists to the database yet - Doesn't have tests yet * Mark device lists as fresh when we persist
This commit is contained in:
parent
b7491aae03
commit
32a4565b55
2
go.mod
2
go.mod
@ -21,7 +21,7 @@ require (
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github.com/matrix-org/go-http-js-libp2p v0.0.0-20200518170932-783164aeeda4
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github.com/matrix-org/go-sqlite3-js v0.0.0-20200522092705-bc8506ccbcf3
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github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26
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github.com/matrix-org/gomatrixserverlib v0.0.0-20200804124807-5012a626de1d
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github.com/matrix-org/gomatrixserverlib v0.0.0-20200806145220-3120f1087f6d
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github.com/matrix-org/naffka v0.0.0-20200422140631-181f1ee7401f
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github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7
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github.com/mattn/go-sqlite3 v2.0.2+incompatible
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2
go.sum
2
go.sum
@ -424,6 +424,8 @@ github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26 h1:Hr3zjRsq2bh
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github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26/go.mod h1:3fxX6gUjWyI/2Bt7J1OLhpCzOfO/bB3AiX0cJtEKud0=
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github.com/matrix-org/gomatrixserverlib v0.0.0-20200804124807-5012a626de1d h1:zYk/bQ5bmHDsRqHBl57aBxo5bizsknWU3sunZf9WnWI=
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github.com/matrix-org/gomatrixserverlib v0.0.0-20200804124807-5012a626de1d/go.mod h1:JsAzE1Ll3+gDWS9JSUHPJiiyAksvOOnGWF2nXdg4ZzU=
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github.com/matrix-org/gomatrixserverlib v0.0.0-20200806145220-3120f1087f6d h1:BsSge1plJoqMyL5xnUFuTkzMXC42GbJW1kMbMizTmL4=
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github.com/matrix-org/gomatrixserverlib v0.0.0-20200806145220-3120f1087f6d/go.mod h1:JsAzE1Ll3+gDWS9JSUHPJiiyAksvOOnGWF2nXdg4ZzU=
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github.com/matrix-org/naffka v0.0.0-20200422140631-181f1ee7401f h1:pRz4VTiRCO4zPlEMc3ESdUOcW4PXHH4Kj+YDz1XyE+Y=
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github.com/matrix-org/naffka v0.0.0-20200422140631-181f1ee7401f/go.mod h1:y0oDTjZDv5SM9a2rp3bl+CU+bvTRINQsdb7YlDql5Go=
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github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7 h1:ntrLa/8xVzeSs8vHFHK25k0C+NV74sYMJnNSg5NoSRo=
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298
keyserver/internal/device_list_update.go
Normal file
298
keyserver/internal/device_list_update.go
Normal file
@ -0,0 +1,298 @@
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// Copyright 2020 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package internal
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import (
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"context"
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"encoding/json"
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"fmt"
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"hash/fnv"
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"sync"
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"time"
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"github.com/matrix-org/dendrite/keyserver/api"
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"github.com/matrix-org/dendrite/keyserver/producers"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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"github.com/sirupsen/logrus"
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)
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// DeviceListUpdater handles device list updates from remote servers.
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//
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// In the case where we have the prev_id for an update, the updater just stores the update (after acquiring a per-user lock).
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// In the case where we do not have the prev_id for an update, the updater marks the user_id as stale and notifies
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// a worker to get the latest device list for this user. Note: stream IDs are scoped per user so missing a prev_id
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// for a (user, device) does not mean that DEVICE is outdated as the previous ID could be for a different device:
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// we have to invalidate all devices for that user. Once the list has been fetched, the per-user lock is acquired and the
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// updater stores the latest list along with the latest stream ID.
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//
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// On startup, the updater spins up N workers which are responsible for querying device keys from remote servers.
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// Workers are scoped by homeserver domain, with one worker responsible for many domains, determined by hashing
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// mod N the server name. Work is sent via a channel which just serves to "poke" the worker as the data is retrieved
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// from the database (which allows us to batch requests to the same server). This has a number of desirable properties:
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// - We guarantee only 1 in-flight /keys/query request per server at any time as there is exactly 1 worker responsible
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// for that domain.
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// - We don't have unbounded growth in proportion to the number of servers (this is more important in a P2P world where
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// we have many many servers)
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// - We can adjust concurrency (at the cost of memory usage) by tuning N, to accommodate mobile devices vs servers.
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// The downsides are that:
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// - Query requests can get queued behind other servers if they hash to the same worker, even if there are other free
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// workers elsewhere. Whilst suboptimal, provided we cap how long a single request can last (e.g using context timeouts)
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// we guarantee we will get around to it. Also, more users on a given server does not increase the number of requests
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// (as /keys/query allows multiple users to be specified) so being stuck behind matrix.org won't materially be any worse
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// than being stuck behind foo.bar
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// In the event that the query fails, the worker spins up a short-lived goroutine whose sole purpose is to inject the server
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// name back into the channel after a certain amount of time. If in the interim the device lists have been updated, then
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// the database query will return no stale lists. Reinjection into the channel continues until success or the server terminates,
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// when it will be reloaded on startup.
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type DeviceListUpdater struct {
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// A map from user_id to a mutex. Used when we are missing prev IDs so we don't make more than 1
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// request to the remote server and race.
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// TODO: Put in an LRU cache to bound growth
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userIDToMutex map[string]*sync.Mutex
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mu *sync.Mutex // protects UserIDToMutex
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db DeviceListUpdaterDatabase
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producer *producers.KeyChange
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fedClient *gomatrixserverlib.FederationClient
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workerChans []chan gomatrixserverlib.ServerName
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}
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// DeviceListUpdaterDatabase is the subset of functionality from storage.Database required for the updater.
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// Useful for testing.
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type DeviceListUpdaterDatabase interface {
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// StaleDeviceLists returns a list of user IDs ending with the domains provided who have stale device lists.
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// If no domains are given, all user IDs with stale device lists are returned.
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StaleDeviceLists(ctx context.Context, domains []gomatrixserverlib.ServerName) ([]string, error)
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// MarkDeviceListStale sets the stale bit for this user to isStale.
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MarkDeviceListStale(ctx context.Context, userID string, isStale bool) error
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// StoreRemoteDeviceKeys persists the given keys. Keys with the same user ID and device ID will be replaced. An empty KeyJSON removes the key
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// for this (user, device). Does not modify the stream ID for keys.
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StoreRemoteDeviceKeys(ctx context.Context, keys []api.DeviceMessage) error
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// PrevIDsExists returns true if all prev IDs exist for this user.
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PrevIDsExists(ctx context.Context, userID string, prevIDs []int) (bool, error)
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}
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// NewDeviceListUpdater creates a new updater which fetches fresh device lists when they go stale.
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func NewDeviceListUpdater(
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db DeviceListUpdaterDatabase, producer *producers.KeyChange, fedClient *gomatrixserverlib.FederationClient,
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numWorkers int,
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) *DeviceListUpdater {
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return &DeviceListUpdater{
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userIDToMutex: make(map[string]*sync.Mutex),
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mu: &sync.Mutex{},
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db: db,
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producer: producer,
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fedClient: fedClient,
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workerChans: make([]chan gomatrixserverlib.ServerName, numWorkers),
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}
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}
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// Start the device list updater, which will try to refresh any stale device lists.
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func (u *DeviceListUpdater) Start() error {
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for i := 0; i < len(u.workerChans); i++ {
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// Allocate a small buffer per channel.
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// If the buffer limit is reached, backpressure will cause the processing of EDUs
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// to stop (in this transaction) until key requests can be made.
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ch := make(chan gomatrixserverlib.ServerName, 10)
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u.workerChans[i] = ch
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go u.worker(ch)
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}
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staleLists, err := u.db.StaleDeviceLists(context.Background(), []gomatrixserverlib.ServerName{})
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if err != nil {
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return err
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}
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for _, userID := range staleLists {
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u.notifyWorkers(userID)
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}
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return nil
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}
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func (u *DeviceListUpdater) mutex(userID string) *sync.Mutex {
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u.mu.Lock()
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defer u.mu.Unlock()
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if u.userIDToMutex[userID] == nil {
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u.userIDToMutex[userID] = &sync.Mutex{}
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}
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return u.userIDToMutex[userID]
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}
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func (u *DeviceListUpdater) Update(ctx context.Context, event gomatrixserverlib.DeviceListUpdateEvent) error {
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isDeviceListStale, err := u.update(ctx, event)
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if err != nil {
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return err
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}
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if isDeviceListStale {
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// poke workers to handle stale device lists
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u.notifyWorkers(event.UserID)
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}
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return nil
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}
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func (u *DeviceListUpdater) update(ctx context.Context, event gomatrixserverlib.DeviceListUpdateEvent) (bool, error) {
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mu := u.mutex(event.UserID)
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mu.Lock()
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defer mu.Unlock()
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// check if we have the prev IDs
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exists, err := u.db.PrevIDsExists(ctx, event.UserID, event.PrevID)
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if err != nil {
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return false, fmt.Errorf("failed to check prev IDs exist for %s (%s): %w", event.UserID, event.DeviceID, err)
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}
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util.GetLogger(ctx).WithFields(logrus.Fields{
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"prev_ids_exist": exists,
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"user_id": event.UserID,
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"device_id": event.DeviceID,
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"stream_id": event.StreamID,
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"prev_ids": event.PrevID,
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}).Info("DeviceListUpdater.Update")
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// if we haven't missed anything update the database and notify users
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if exists {
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keys := []api.DeviceMessage{
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{
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DeviceKeys: api.DeviceKeys{
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DeviceID: event.DeviceID,
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DisplayName: event.DeviceDisplayName,
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KeyJSON: event.Keys,
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UserID: event.UserID,
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},
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StreamID: event.StreamID,
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},
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}
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err = u.db.StoreRemoteDeviceKeys(ctx, keys)
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if err != nil {
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return false, fmt.Errorf("failed to store remote device keys for %s (%s): %w", event.UserID, event.DeviceID, err)
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}
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// ALWAYS emit key changes when we've been poked over federation even if there's no change
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// just in case this poke is important for something.
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err = u.producer.ProduceKeyChanges(keys)
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if err != nil {
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return false, fmt.Errorf("failed to produce device key changes for %s (%s): %w", event.UserID, event.DeviceID, err)
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}
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return false, nil
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}
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err = u.db.MarkDeviceListStale(ctx, event.UserID, true)
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if err != nil {
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return false, fmt.Errorf("failed to mark device list for %s as stale: %w", event.UserID, err)
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}
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return true, nil
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}
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func (u *DeviceListUpdater) notifyWorkers(userID string) {
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_, remoteServer, err := gomatrixserverlib.SplitID('@', userID)
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if err != nil {
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return
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}
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hash := fnv.New32a()
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_, _ = hash.Write([]byte(remoteServer))
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index := int(hash.Sum32()) % len(u.workerChans)
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u.workerChans[index] <- remoteServer
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}
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func (u *DeviceListUpdater) worker(ch chan gomatrixserverlib.ServerName) {
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// It's possible to get many of the same server name in the channel, so in order
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// to prevent processing the same server over and over we keep track of when we
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// last made a request to the server. If we get the server name during the cooloff
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// period, we'll ignore the poke.
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lastProcessed := make(map[gomatrixserverlib.ServerName]time.Time)
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cooloffPeriod := time.Minute
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shouldProcess := func(srv gomatrixserverlib.ServerName) bool {
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// we should process requests when now is after the last process time + cooloff
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return time.Now().After(lastProcessed[srv].Add(cooloffPeriod))
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}
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// on failure, spin up a short-lived goroutine to inject the server name again.
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inject := func(srv gomatrixserverlib.ServerName, duration time.Duration) {
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time.Sleep(duration)
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ch <- srv
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}
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for serverName := range ch {
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if !shouldProcess(serverName) {
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// do not inject into the channel as we know there will be a sleeping goroutine
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// which will do it after the cooloff period expires
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continue
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}
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lastProcessed[serverName] = time.Now()
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shouldRetry := u.processServer(serverName)
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if shouldRetry {
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go inject(serverName, cooloffPeriod) // TODO: Backoff?
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}
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}
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}
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func (u *DeviceListUpdater) processServer(serverName gomatrixserverlib.ServerName) bool {
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requestTimeout := time.Minute // max amount of time we want to spend on each request
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ctx, cancel := context.WithTimeout(context.Background(), requestTimeout)
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defer cancel()
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logger := util.GetLogger(ctx).WithField("server_name", serverName)
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// fetch stale device lists
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userIDs, err := u.db.StaleDeviceLists(ctx, []gomatrixserverlib.ServerName{serverName})
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if err != nil {
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logger.WithError(err).Error("failed to load stale device lists")
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return true
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}
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hasFailures := false
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for _, userID := range userIDs {
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if ctx.Err() != nil {
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// we've timed out, give up and go to the back of the queue to let another server be processed.
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hasFailures = true
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break
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}
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res, err := u.fedClient.GetUserDevices(ctx, serverName, userID)
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if err != nil {
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logger.WithError(err).WithField("user_id", userID).Error("failed to query device keys for user")
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hasFailures = true
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continue
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}
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err = u.updateDeviceList(ctx, &res)
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if err != nil {
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logger.WithError(err).WithField("user_id", userID).Error("fetched device list but failed to store it")
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hasFailures = true
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}
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}
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return hasFailures
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}
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func (u *DeviceListUpdater) updateDeviceList(ctx context.Context, res *gomatrixserverlib.RespUserDevices) error {
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keys := make([]api.DeviceMessage, len(res.Devices))
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for i, device := range res.Devices {
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keyJSON, err := json.Marshal(device.Keys)
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if err != nil {
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util.GetLogger(ctx).WithField("keys", device.Keys).Error("failed to marshal keys, skipping device")
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continue
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}
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keys[i] = api.DeviceMessage{
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StreamID: res.StreamID,
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DeviceKeys: api.DeviceKeys{
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DeviceID: device.DeviceID,
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DisplayName: device.DisplayName,
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UserID: res.UserID,
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KeyJSON: keyJSON,
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},
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}
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}
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err := u.db.StoreRemoteDeviceKeys(ctx, keys)
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if err != nil {
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return err
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}
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return u.db.MarkDeviceListStale(ctx, res.UserID, false)
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}
|
@ -38,74 +38,22 @@ type KeyInternalAPI struct {
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FedClient *gomatrixserverlib.FederationClient
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UserAPI userapi.UserInternalAPI
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Producer *producers.KeyChange
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// A map from user_id to a mutex. Used when we are missing prev IDs so we don't make more than 1
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// request to the remote server and race.
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// TODO: Put in an LRU cache to bound growth
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UserIDToMutex map[string]*sync.Mutex
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Mutex *sync.Mutex // protects UserIDToMutex
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Updater *DeviceListUpdater
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}
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func (a *KeyInternalAPI) SetUserAPI(i userapi.UserInternalAPI) {
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a.UserAPI = i
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}
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func (a *KeyInternalAPI) mutex(userID string) *sync.Mutex {
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a.Mutex.Lock()
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defer a.Mutex.Unlock()
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if a.UserIDToMutex[userID] == nil {
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a.UserIDToMutex[userID] = &sync.Mutex{}
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}
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return a.UserIDToMutex[userID]
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}
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func (a *KeyInternalAPI) InputDeviceListUpdate(
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ctx context.Context, req *api.InputDeviceListUpdateRequest, res *api.InputDeviceListUpdateResponse,
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) {
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mu := a.mutex(req.Event.UserID)
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mu.Lock()
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defer mu.Unlock()
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// check if we have the prev IDs
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exists, err := a.DB.PrevIDsExists(ctx, req.Event.UserID, req.Event.PrevID)
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err := a.Updater.Update(ctx, req.Event)
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if err != nil {
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res.Error = &api.KeyError{
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Err: fmt.Sprintf("failed to check if prev ids exist: %s", err),
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Err: fmt.Sprintf("failed to update device list: %s", err),
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}
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return
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}
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// if we haven't missed anything update the database and notify users
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if exists {
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keys := []api.DeviceMessage{
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{
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DeviceKeys: api.DeviceKeys{
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DeviceID: req.Event.DeviceID,
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DisplayName: req.Event.DeviceDisplayName,
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KeyJSON: req.Event.Keys,
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UserID: req.Event.UserID,
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},
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StreamID: req.Event.StreamID,
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},
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}
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err = a.DB.StoreRemoteDeviceKeys(ctx, keys)
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if err != nil {
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res.Error = &api.KeyError{
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Err: fmt.Sprintf("failed to store remote device keys: %s", err),
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}
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return
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}
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// ALWAYS emit key changes when we've been poked over federation just in case
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// this poke is important for something.
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err = a.Producer.ProduceKeyChanges(keys)
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if err != nil {
|
||||
res.Error = &api.KeyError{
|
||||
Err: fmt.Sprintf("failed to emit remote device key changes: %s", err),
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// if we're missing an ID go and fetch it from the remote HS
|
||||
|
||||
}
|
||||
|
||||
func (a *KeyInternalAPI) QueryKeyChanges(ctx context.Context, req *api.QueryKeyChangesRequest, res *api.QueryKeyChangesResponse) {
|
||||
|
@ -15,8 +15,6 @@
|
||||
package keyserver
|
||||
|
||||
import (
|
||||
"sync"
|
||||
|
||||
"github.com/Shopify/sarama"
|
||||
"github.com/gorilla/mux"
|
||||
"github.com/matrix-org/dendrite/internal/config"
|
||||
@ -52,12 +50,16 @@ func NewInternalAPI(
|
||||
Producer: producer,
|
||||
DB: db,
|
||||
}
|
||||
updater := internal.NewDeviceListUpdater(db, keyChangeProducer, fedClient, 8) // 8 workers TODO: configurable
|
||||
err = updater.Start()
|
||||
if err != nil {
|
||||
logrus.WithError(err).Panicf("failed to start device list updater")
|
||||
}
|
||||
return &internal.KeyInternalAPI{
|
||||
DB: db,
|
||||
ThisServer: cfg.Matrix.ServerName,
|
||||
FedClient: fedClient,
|
||||
Producer: keyChangeProducer,
|
||||
Mutex: &sync.Mutex{},
|
||||
UserIDToMutex: make(map[string]*sync.Mutex),
|
||||
DB: db,
|
||||
ThisServer: cfg.Matrix.ServerName,
|
||||
FedClient: fedClient,
|
||||
Producer: keyChangeProducer,
|
||||
Updater: updater,
|
||||
}
|
||||
}
|
||||
|
@ -19,6 +19,7 @@ import (
|
||||
"encoding/json"
|
||||
|
||||
"github.com/matrix-org/dendrite/keyserver/api"
|
||||
"github.com/matrix-org/gomatrixserverlib"
|
||||
)
|
||||
|
||||
type Database interface {
|
||||
@ -64,4 +65,11 @@ type Database interface {
|
||||
// A to offset of sarama.OffsetNewest means no upper limit.
|
||||
// Returns the offset of the latest key change.
|
||||
KeyChanges(ctx context.Context, partition int32, fromOffset, toOffset int64) (userIDs []string, latestOffset int64, err error)
|
||||
|
||||
// StaleDeviceLists returns a list of user IDs ending with the domains provided who have stale device lists.
|
||||
// If no domains are given, all user IDs with stale device lists are returned.
|
||||
StaleDeviceLists(ctx context.Context, domains []gomatrixserverlib.ServerName) ([]string, error)
|
||||
|
||||
// MarkDeviceListStale sets the stale bit for this user to isStale.
|
||||
MarkDeviceListStale(ctx context.Context, userID string, isStale bool) error
|
||||
}
|
||||
|
@ -22,6 +22,7 @@ import (
|
||||
"github.com/matrix-org/dendrite/internal/sqlutil"
|
||||
"github.com/matrix-org/dendrite/keyserver/api"
|
||||
"github.com/matrix-org/dendrite/keyserver/storage/tables"
|
||||
"github.com/matrix-org/gomatrixserverlib"
|
||||
)
|
||||
|
||||
type Database struct {
|
||||
@ -124,3 +125,14 @@ func (d *Database) StoreKeyChange(ctx context.Context, partition int32, offset i
|
||||
func (d *Database) KeyChanges(ctx context.Context, partition int32, fromOffset, toOffset int64) (userIDs []string, latestOffset int64, err error) {
|
||||
return d.KeyChangesTable.SelectKeyChanges(ctx, partition, fromOffset, toOffset)
|
||||
}
|
||||
|
||||
// StaleDeviceLists returns a list of user IDs ending with the domains provided who have stale device lists.
|
||||
// If no domains are given, all user IDs with stale device lists are returned.
|
||||
func (d *Database) StaleDeviceLists(ctx context.Context, domains []gomatrixserverlib.ServerName) ([]string, error) {
|
||||
return nil, nil // TODO
|
||||
}
|
||||
|
||||
// MarkDeviceListStale sets the stale bit for this user to isStale.
|
||||
func (d *Database) MarkDeviceListStale(ctx context.Context, userID string, isStale bool) error {
|
||||
return nil // TODO
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user