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syncapi: Rename and split out tokens (#1025)

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* syncapi: Rename and split out tokens

Previously we used the badly named `PaginationToken` which was
used for both `/sync` and `/messages` requests. This quickly
became confusing because named fields like `PDUPosition` meant
different things depending on the token type. Instead, we now have
two token types: `TopologyToken` and `StreamingToken`, both of
which have fields which make more sense for their specific situations.

Updated the codebase to use one or the other. `PaginationToken` still
lives on as `syncToken`, an unexported type which both tokens rely on.
This allows us to guarantee that the specific mappings of positions
to a string remain solely under the control of the `types` package.
This enables us to move high-level conceptual things like
"decrement this topological token" to function calls e.g
`TopologicalToken.Decrement()`.

Currently broken because `/messages` seemingly used both stream and
topological tokens, though I need to confirm this.

* final tweaks/hacks

* spurious logging

* Review comments and linting
This commit is contained in:
Kegsay 2020-05-13 12:14:50 +01:00 • committed by GitHub
parent 31e6a7f193
commit 5e9dce1c0c
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15 changed files with 457 additions and 439 deletions
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10
syncapi/sync/notifier.go
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@ -36,7 +36,7 @@ type Notifier struct {
// Protects currPos and userStreams.
streamLock *sync.Mutex
// The latest sync position
currPos types.PaginationToken
currPos types.StreamingToken
// A map of user_id => UserStream which can be used to wake a given user's /sync request.
userStreams map[string]*UserStream
// The last time we cleaned out stale entries from the userStreams map
@ -46,7 +46,7 @@ type Notifier struct {
// NewNotifier creates a new notifier set to the given sync position.
// In order for this to be of any use, the Notifier needs to be told all rooms and
// the joined users within each of them by calling Notifier.Load(*storage.SyncServerDatabase).
func NewNotifier(pos types.PaginationToken) *Notifier {
func NewNotifier(pos types.StreamingToken) *Notifier {
return &Notifier{
currPos: pos,
roomIDToJoinedUsers: make(map[string]userIDSet),
@ -68,7 +68,7 @@ func NewNotifier(pos types.PaginationToken) *Notifier {
// event type it handles, leaving other fields as 0.
func (n *Notifier) OnNewEvent(
ev *gomatrixserverlib.HeaderedEvent, roomID string, userIDs []string,
posUpdate types.PaginationToken,
posUpdate types.StreamingToken,
) {
// update the current position then notify relevant /sync streams.
// This needs to be done PRIOR to waking up users as they will read this value.
@ -151,7 +151,7 @@ func (n *Notifier) Load(ctx context.Context, db storage.Database) error {
}
// CurrentPosition returns the current sync position
func (n *Notifier) CurrentPosition() types.PaginationToken {
func (n *Notifier) CurrentPosition() types.StreamingToken {
n.streamLock.Lock()
defer n.streamLock.Unlock()
@ -173,7 +173,7 @@ func (n *Notifier) setUsersJoinedToRooms(roomIDToUserIDs map[string][]string) {
}
}
func (n *Notifier) wakeupUsers(userIDs []string, newPos types.PaginationToken) {
func (n *Notifier) wakeupUsers(userIDs []string, newPos types.StreamingToken) {
for _, userID := range userIDs {
stream := n.fetchUserStream(userID, false)
if stream != nil {