Replace publicroomsapi with a combination of clientapi/roomserver/currentstateserver (#1174)

* Use content_value instead of membership

* Fix build

* Replace publicroomsapi with a combination of clientapi/roomserver/currentstateserver

- All public rooms paths are now handled by clientapi
- Requests to (un)publish rooms are sent to the roomserver via `PerformPublish`
  which are stored in a new `published_table.go`
- Requests for public rooms are handled in clientapi by:
    * Fetch all room IDs which are published using `QueryPublishedRooms` on the roomserver.
    * Apply pagination parameters to the slice.
    * Do a `QueryBulkStateContent` request to the currentstateserver to pull out
      required state event *content* (not entire events).
    * Aggregate and return the chunk.

Mostly but not fully implemented (DB queries on currentstateserver are missing)

* Fix pq query

* Make postgres work

* Make sqlite work

* Fix tests

* Unbreak pagination tests

* Linting

roomserver/internal/perform_publish.go

@@ -0,0 +1,20 @@
+package internal
+
+import (
+	"context"
+
+	"github.com/matrix-org/dendrite/roomserver/api"
+)
+
+func (r *RoomserverInternalAPI) PerformPublish(
+	ctx context.Context,
+	req *api.PerformPublishRequest,
+	res *api.PerformPublishResponse,
+) {
+	err := r.DB.PublishRoom(ctx, req.RoomID, req.Visibility == "public")
+	if err != nil {
+		res.Error = &api.PerformError{
+			Msg: err.Error(),
+		}
+	}
+}

roomserver/internal/query.go

@@ -930,3 +930,16 @@ func (r *RoomserverInternalAPI) QueryRoomVersionForRoom(
 	r.Cache.StoreRoomVersion(request.RoomID, response.RoomVersion)
 	return nil
 }
+
+func (r *RoomserverInternalAPI) QueryPublishedRooms(
+	ctx context.Context,
+	req *api.QueryPublishedRoomsRequest,
+	res *api.QueryPublishedRoomsResponse,
+) error {
+	rooms, err := r.DB.GetPublishedRooms(ctx)
+	if err != nil {
+		return err
+	}
+	res.RoomIDs = rooms
+	return nil
+}