c3457807e7
On top of 'channel-type' subscriptions we had, we now support 'user-type' subscriptions to handle subscription requests (ie: we want this specific user to be subscribed to that specific channel)
106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
package websocket
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import (
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"context"
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"encoding/json"
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"github.com/titpetric/factory"
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"github.com/crusttech/crust/internal/payload"
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"github.com/crusttech/crust/internal/payload/outgoing"
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"github.com/crusttech/crust/sam/repository"
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"github.com/crusttech/crust/sam/types"
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)
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type (
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eventQueueWalker interface {
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Walk(func(session *Session))
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}
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eventQueue struct {
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origin uint64
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queue chan *types.EventQueueItem
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}
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)
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const (
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eventQueueBacklog = 512
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)
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var eq *eventQueue
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func init() {
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eq = EventQueue(factory.Sonyflake.NextID())
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}
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func EventQueue(origin uint64) *eventQueue {
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return &eventQueue{
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origin: origin,
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queue: make(chan *types.EventQueueItem, eventQueueBacklog),
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}
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}
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// @todo: retire this function, use Events().Push(ctx, item) directly.
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func (eq *eventQueue) store(ctx context.Context, qp repository.EventsRepository) {
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go func() {
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for {
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select {
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case <-ctx.Done():
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case eqi := <-eq.queue:
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qp.Push(ctx, eqi)
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}
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}
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}()
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}
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func (eq *eventQueue) feedSessions(ctx context.Context, config *repository.Flags, qp repository.EventsRepository, store eventQueueWalker) error {
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for {
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item, err := qp.Pull(ctx)
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if err != nil {
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return err
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}
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if item.Subscriber == "" {
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// Distribute payload to all connected sessions
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store.Walk(func(s *Session) {
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s.sendBytes(item.Payload)
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})
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} else {
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switch item.SubType {
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case types.EventQueueItemSubTypeUser:
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// Holds channel info (in fact, ID only) when payload is unmarshaled
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var join *outgoing.Channel
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if err := json.Unmarshal(item.Payload, join); err == nil {
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return err
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}
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// This store.Walk handler does send to subscribed sessions but
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// subscribes all sessions that belong to the same user
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store.Walk(func(s *Session) {
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if payload.Uint64toa(s.user.Identity()) == item.Subscriber {
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s.subs.Add(join.ID)
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}
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})
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case types.EventQueueItemSubTypeChannel:
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// Distribute payload to specific subscribers
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store.Walk(func(s *Session) {
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if s.subs.Get(item.Subscriber) != nil {
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s.sendBytes(item.Payload)
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}
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})
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}
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}
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}
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}
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// Adds origin to the event and puts it into queue.
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func (eq *eventQueue) push(ctx context.Context, eqi *types.EventQueueItem) {
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eqi.Origin = eq.origin
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select {
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case <-ctx.Done():
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case eq.queue <- eqi:
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}
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}
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