Remove clientapi producers which aren't actually producers (#1111)

* Remove clientapi producers which aren't actually producers

They are actually just convenience wrappers around the internal APIs
for roomserver/eduserver. Move their logic to their respective `api`
packages and call them directly.

* Remove TODO

* unbreak ygg

roomserver/api/wrapper.go

@@ -0,0 +1,113 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package api
+
+import (
+	"context"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+// SendEvents to the roomserver The events are written with KindNew.
+func SendEvents(
+	ctx context.Context, rsAPI RoomserverInternalAPI, events []gomatrixserverlib.HeaderedEvent,
+	sendAsServer gomatrixserverlib.ServerName, txnID *TransactionID,
+) (string, error) {
+	ires := make([]InputRoomEvent, len(events))
+	for i, event := range events {
+		ires[i] = InputRoomEvent{
+			Kind:          KindNew,
+			Event:         event,
+			AuthEventIDs:  event.AuthEventIDs(),
+			SendAsServer:  string(sendAsServer),
+			TransactionID: txnID,
+		}
+	}
+	return SendInputRoomEvents(ctx, rsAPI, ires)
+}
+
+// SendEventWithState writes an event with KindNew to the roomserver
+// with the state at the event as KindOutlier before it. Will not send any event that is
+// marked as `true` in haveEventIDs
+func SendEventWithState(
+	ctx context.Context, rsAPI RoomserverInternalAPI, state *gomatrixserverlib.RespState,
+	event gomatrixserverlib.HeaderedEvent, haveEventIDs map[string]bool,
+) error {
+	outliers, err := state.Events()
+	if err != nil {
+		return err
+	}
+
+	var ires []InputRoomEvent
+	for _, outlier := range outliers {
+		if haveEventIDs[outlier.EventID()] {
+			continue
+		}
+		ires = append(ires, InputRoomEvent{
+			Kind:         KindOutlier,
+			Event:        outlier.Headered(event.RoomVersion),
+			AuthEventIDs: outlier.AuthEventIDs(),
+		})
+	}
+
+	stateEventIDs := make([]string, len(state.StateEvents))
+	for i := range state.StateEvents {
+		stateEventIDs[i] = state.StateEvents[i].EventID()
+	}
+
+	ires = append(ires, InputRoomEvent{
+		Kind:          KindNew,
+		Event:         event,
+		AuthEventIDs:  event.AuthEventIDs(),
+		HasState:      true,
+		StateEventIDs: stateEventIDs,
+	})
+
+	_, err = SendInputRoomEvents(ctx, rsAPI, ires)
+	return err
+}
+
+// SendInputRoomEvents to the roomserver.
+func SendInputRoomEvents(
+	ctx context.Context, rsAPI RoomserverInternalAPI, ires []InputRoomEvent,
+) (eventID string, err error) {
+	request := InputRoomEventsRequest{InputRoomEvents: ires}
+	var response InputRoomEventsResponse
+	err = rsAPI.InputRoomEvents(ctx, &request, &response)
+	eventID = response.EventID
+	return
+}
+
+// SendInvite event to the roomserver.
+// This should only be needed for invite events that occur outside of a known room.
+// If we are in the room then the event should be sent using the SendEvents method.
+func SendInvite(
+	ctx context.Context,
+	rsAPI RoomserverInternalAPI, inviteEvent gomatrixserverlib.HeaderedEvent,
+	inviteRoomState []gomatrixserverlib.InviteV2StrippedState,
+	sendAsServer gomatrixserverlib.ServerName, txnID *TransactionID,
+) error {
+	request := InputRoomEventsRequest{
+		InputInviteEvents: []InputInviteEvent{{
+			Event:           inviteEvent,
+			InviteRoomState: inviteRoomState,
+			RoomVersion:     inviteEvent.RoomVersion,
+			SendAsServer:    string(sendAsServer),
+			TransactionID:   txnID,
+		}},
+	}
+	var response InputRoomEventsResponse
+	return rsAPI.InputRoomEvents(ctx, &request, &response)
+}