mirror of
https://github.com/1f349/dendrite.git
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Fix potential state reset when trying to join a room (#3040)
When trying to join a room in short sequence, it is possible that a state reset occurs. This fixes it by using `singleflight`.
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parent
f956a8c1d9
commit
3dcca4017c
@ -20,14 +20,16 @@ import (
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"strings"
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"github.com/gorilla/mux"
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"github.com/matrix-org/dendrite/setup/base"
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userapi "github.com/matrix-org/dendrite/userapi/api"
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"github.com/matrix-org/gomatrixserverlib/fclient"
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"github.com/matrix-org/gomatrixserverlib/spec"
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"github.com/matrix-org/util"
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"github.com/nats-io/nats.go"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/sirupsen/logrus"
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"golang.org/x/sync/singleflight"
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"github.com/matrix-org/dendrite/setup/base"
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userapi "github.com/matrix-org/dendrite/userapi/api"
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appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
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"github.com/matrix-org/dendrite/clientapi/api"
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@ -84,6 +86,14 @@ func Setup(
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unstableFeatures["org.matrix."+msc] = true
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}
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// singleflight protects /join endpoints from being invoked
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// multiple times from the same user and room, otherwise
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// a state reset can occur. This also avoids unneeded
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// state calculations.
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// TODO: actually fix this in the roomserver, as there are
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// possibly other ways that can result in a stat reset.
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sf := singleflight.Group{}
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if cfg.Matrix.WellKnownClientName != "" {
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logrus.Infof("Setting m.homeserver base_url as %s at /.well-known/matrix/client", cfg.Matrix.WellKnownClientName)
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wkMux.Handle("/client", httputil.MakeExternalAPI("wellknown", func(r *http.Request) util.JSONResponse {
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@ -264,9 +274,17 @@ func Setup(
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if err != nil {
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return util.ErrorResponse(err)
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}
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// Only execute a join for roomIDOrAlias and UserID once. If there is a join in progress
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// it waits for it to complete and returns that result for subsequent requests.
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resp, _, _ := sf.Do(vars["roomIDOrAlias"]+device.UserID, func() (any, error) {
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return JoinRoomByIDOrAlias(
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req, device, rsAPI, userAPI, vars["roomIDOrAlias"],
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)
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), nil
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})
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// once all joins are processed, drop them from the cache. Further requests
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// will be processed as usual.
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sf.Forget(vars["roomIDOrAlias"] + device.UserID)
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return resp.(util.JSONResponse)
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}, httputil.WithAllowGuests()),
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).Methods(http.MethodPost, http.MethodOptions)
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@ -300,9 +318,17 @@ func Setup(
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if err != nil {
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return util.ErrorResponse(err)
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}
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// Only execute a join for roomID and UserID once. If there is a join in progress
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// it waits for it to complete and returns that result for subsequent requests.
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resp, _, _ := sf.Do(vars["roomID"]+device.UserID, func() (any, error) {
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return JoinRoomByIDOrAlias(
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req, device, rsAPI, userAPI, vars["roomID"],
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)
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), nil
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})
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// once all joins are processed, drop them from the cache. Further requests
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// will be processed as usual.
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sf.Forget(vars["roomID"] + device.UserID)
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return resp.(util.JSONResponse)
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}, httputil.WithAllowGuests()),
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).Methods(http.MethodPost, http.MethodOptions)
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v3mux.Handle("/rooms/{roomID}/leave",
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1
go.mod
1
go.mod
@ -45,6 +45,7 @@ require (
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golang.org/x/crypto v0.9.0
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golang.org/x/image v0.5.0
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golang.org/x/mobile v0.0.0-20221020085226-b36e6246172e
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golang.org/x/sync v0.1.0
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golang.org/x/term v0.8.0
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gopkg.in/h2non/bimg.v1 v1.1.9
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gopkg.in/yaml.v2 v2.4.0
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1
go.sum
1
go.sum
@ -614,6 +614,7 @@ golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJ
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golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
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golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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