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dendrite/federationapi/internal/query.go
Neil Alexander a763cbb0e1
Roomserver/federation input refactor (#2104)
* Put federation client functions into their own file

* Look for missing auth events in RS input

* Remove retrieveMissingAuthEvents from federation API

* Logging

* Sorta transplanted the code over

* Use event origin failing all else

* Don't get stuck on mutexes:

* Add verifier

* Don't mark state events with zero snapshot NID as not existing

* Check missing state if not an outlier before storing the event

* Reject instead of soft-fail, don't copy roominfo so much

* Use synchronous contexts, limit time to fetch missing events

* Clean up some commented out bits

* Simplify `/send` endpoint significantly

* Submit async

* Report errors on sending to RS input

* Set max payload in NATS to 16MB

* Tweak metrics

* Add `workerForRoom` for tidiness

* Try skipping unmarshalling errors for RespMissingEvents

* Track missing prev events separately to avoid calculating state when not possible

* Tweak logic around checking missing state

* Care about state when checking missing prev events

* Don't check missing state for create events

* Try that again

* Handle create events better

* Send create room events as new

* Use given event kind when sending auth/state events

* Revert "Use given event kind when sending auth/state events"

This reverts commit 089d64d271.

* Only search for missing prev events or state for new events

* Tweaks

* We only have missing prev if we don't supply state

* Room version tweaks

* Allow async inputs again

* Apply backpressure to consumers/synchronous requests to hopefully stop things being overwhelmed

* Set timeouts on roomserver input tasks (need to decide what timeout makes sense)

* Use work queue policy, deliver all on restart

* Reduce chance of duplicates being sent by NATS

* Limit the number of servers we attempt to reduce backpressure

* Some review comment fixes

* Tidy up a couple things

* Don't limit servers, randomise order using map

* Some context refactoring

* Update gmsl

* Don't resend create events

* Set stateIDs length correctly or else the roomserver thinks there are missing events when there aren't

* Exclude our own servername

* Try backing off servers

* Make excluding self behaviour optional

* Exclude self from g_m_e

* Update sytest-whitelist

* Update consumers for the roomserver output stream

* Remember to send outliers for state returned from /gme

* Make full HTTP tests less upsetti

* Remove 'If a device list update goes missing, the server resyncs on the next one' from the sytest blacklist

* Remove debugging test

* Fix blacklist again, remove unnecessary duplicate context

* Clearer contexts, don't use background in case there's something happening there

* Don't queue up events more than once in memory

* Correctly identify create events when checking for state

* Fill in gaps again in /gme code

* Remove `AuthEventIDs` from `InputRoomEvent`

* Remove stray field

Co-authored-by: Kegan Dougal <kegan@matrix.org>
2022-01-27 14:29:14 +00:00

97 lines
3.5 KiB
Go

package internal
import (
"context"
"fmt"
"time"
"github.com/matrix-org/dendrite/federationapi/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
)
// QueryJoinedHostServerNamesInRoom implements api.FederationInternalAPI
func (f *FederationInternalAPI) QueryJoinedHostServerNamesInRoom(
ctx context.Context,
request *api.QueryJoinedHostServerNamesInRoomRequest,
response *api.QueryJoinedHostServerNamesInRoomResponse,
) (err error) {
joinedHosts, err := f.db.GetJoinedHostsForRooms(ctx, []string{request.RoomID}, request.ExcludeSelf)
if err != nil {
return
}
response.ServerNames = joinedHosts
return
}
func (a *FederationInternalAPI) fetchServerKeysDirectly(ctx context.Context, serverName gomatrixserverlib.ServerName) (*gomatrixserverlib.ServerKeys, error) {
ctx, cancel := context.WithTimeout(ctx, time.Second*30)
defer cancel()
ires, err := a.doRequestIfNotBackingOffOrBlacklisted(serverName, func() (interface{}, error) {
return a.federation.GetServerKeys(ctx, serverName)
})
if err != nil {
return nil, err
}
sks := ires.(gomatrixserverlib.ServerKeys)
return &sks, nil
}
func (a *FederationInternalAPI) fetchServerKeysFromCache(
ctx context.Context, req *api.QueryServerKeysRequest,
) ([]gomatrixserverlib.ServerKeys, error) {
var results []gomatrixserverlib.ServerKeys
for keyID, criteria := range req.KeyIDToCriteria {
serverKeysResponses, _ := a.db.GetNotaryKeys(ctx, req.ServerName, []gomatrixserverlib.KeyID{keyID})
if len(serverKeysResponses) == 0 {
return nil, fmt.Errorf("failed to find server key response for key ID %s", keyID)
}
// we should only get 1 result as we only gave 1 key ID
sk := serverKeysResponses[0]
util.GetLogger(ctx).Infof("fetchServerKeysFromCache: minvalid:%v keys: %+v", criteria.MinimumValidUntilTS, sk)
if criteria.MinimumValidUntilTS != 0 {
// check if it's still valid. if they have the same value that's also valid
if sk.ValidUntilTS < criteria.MinimumValidUntilTS {
return nil, fmt.Errorf(
"found server response for key ID %s but it is no longer valid, min: %v valid_until: %v",
keyID, criteria.MinimumValidUntilTS, sk.ValidUntilTS,
)
}
}
results = append(results, sk)
}
return results, nil
}
func (a *FederationInternalAPI) QueryServerKeys(
ctx context.Context, req *api.QueryServerKeysRequest, res *api.QueryServerKeysResponse,
) error {
// attempt to satisfy the entire request from the cache first
results, err := a.fetchServerKeysFromCache(ctx, req)
if err == nil {
// satisfied entirely from cache, return it
res.ServerKeys = results
return nil
}
util.GetLogger(ctx).WithField("server", req.ServerName).WithError(err).Warn("notary: failed to satisfy keys request entirely from cache, hitting direct")
serverKeys, err := a.fetchServerKeysDirectly(ctx, req.ServerName)
if err != nil {
// try to load as much as we can from the cache in a best effort basis
util.GetLogger(ctx).WithField("server", req.ServerName).WithError(err).Warn("notary: failed to ask server for keys, returning best effort keys")
serverKeysResponses, dbErr := a.db.GetNotaryKeys(ctx, req.ServerName, req.KeyIDs())
if dbErr != nil {
return fmt.Errorf("notary: server returned %s, and db returned %s", err, dbErr)
}
res.ServerKeys = serverKeysResponses
return nil
}
// cache it!
if err = a.db.UpdateNotaryKeys(context.Background(), req.ServerName, *serverKeys); err != nil {
// non-fatal, still return the response
util.GetLogger(ctx).WithError(err).Warn("failed to UpdateNotaryKeys")
}
res.ServerKeys = []gomatrixserverlib.ServerKeys{*serverKeys}
return nil
}