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api_event.go
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api_event.go
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package weshnet
import (
"context"
"errors"
"fmt"
"github.com/libp2p/go-libp2p/p2p/host/eventbus"
"berty.tech/weshnet/v2/pkg/errcode"
"berty.tech/weshnet/v2/pkg/protocoltypes"
)
func checkParametersConsistency(sinceID, untilID []byte, sinceNow, untilNow, reverseOrder bool) error {
// Since can't be both set to an ID and to now
if sinceID != nil && sinceNow {
return errcode.ErrCode_ErrInvalidInput.Wrap(errors.New("params SinceNow and SinceID are both set"))
}
// Until can't be both set to an ID and to now
if untilID != nil && untilNow {
return errcode.ErrCode_ErrInvalidInput.Wrap(errors.New("params UntilNow and UntilID are both set"))
}
// Since and Until can't be both set to now at the same time
if sinceNow && untilNow {
return errcode.ErrCode_ErrInvalidInput.Wrap(errors.New("params SinceNow and UntilNow are both set"))
}
// Can't reverse events orders if subscribed to new events
if untilID == nil && !untilNow && reverseOrder {
return errcode.ErrCode_ErrInvalidInput.Wrap(errors.New("reverse chronological order requested while subscribing to new events"))
}
return nil
}
// GroupMetadataList replays previous and subscribes to new metadata events from the group
func (s *service) GroupMetadataList(req *protocoltypes.GroupMetadataList_Request, sub protocoltypes.ProtocolService_GroupMetadataListServer) error {
ctx, cancel := context.WithCancel(sub.Context())
defer cancel()
// Get group context / check if the group is opened
cg, err := s.GetContextGroupForID(req.GroupPk)
if err != nil {
return errcode.ErrCode_ErrGroupMemberUnknownGroupID.Wrap(err)
}
// Check parameters consistency
if err := checkParametersConsistency(req.SinceId, req.UntilId, req.SinceNow, req.UntilNow, req.ReverseOrder); err != nil {
return err
}
// Subscribe to new metadata events if requested
var newEvents <-chan interface{}
if req.UntilId == nil && !req.UntilNow {
sub, err := cg.MetadataStore().EventBus().Subscribe([]interface{}{
// new(stores.EventReplicated),
new(*protocoltypes.GroupMetadataEvent),
}, eventbus.Name("weshnet/api/group-metadata-list"), eventbus.BufSize(32))
if err != nil {
return fmt.Errorf("unable to subscribe to new events")
}
defer sub.Close()
newEvents = sub.Out()
}
// Subscribe to previous metadata events and stream them if requested
previousEvents := make(chan *protocoltypes.GroupMetadataEvent)
if !req.SinceNow {
pevt, err := cg.MetadataStore().ListEvents(ctx, req.SinceId, req.UntilId, req.ReverseOrder)
if err != nil {
return err
}
go func() {
for {
var evt *protocoltypes.GroupMetadataEvent
select {
case <-ctx.Done():
return
case evt = <-pevt:
}
if evt == nil {
// if we don't want to stream new event, cancel the process
if req.UntilNow {
cancel()
} else {
previousEvents <- &protocoltypes.GroupMetadataEvent{EventContext: nil}
}
cg.logger.Debug("GroupMetadataList: previous events stream ended")
return
}
previousEvents <- evt
}
}()
}
// Subscribe to new metadata events and stream them if requested
for {
var event interface{}
select {
case <-ctx.Done():
return nil
case event = <-previousEvents:
case event = <-newEvents:
}
msg := event.(*protocoltypes.GroupMetadataEvent)
if msg.EventContext == nil {
continue
}
if err := sub.Send(msg); err != nil {
return err
}
cg.logger.Info("service - metadata store - sent 1 event from log subscription")
}
}
// GroupMessageList replays previous and subscribes to new message events from the group
func (s *service) GroupMessageList(req *protocoltypes.GroupMessageList_Request, sub protocoltypes.ProtocolService_GroupMessageListServer) error {
ctx, cancel := context.WithCancel(sub.Context())
defer cancel()
// Get group context / check if the group is opened
cg, err := s.GetContextGroupForID(req.GroupPk)
if err != nil {
return errcode.ErrCode_ErrGroupMemberUnknownGroupID.Wrap(err)
}
// Check parameters consistency
if err := checkParametersConsistency(req.SinceId, req.UntilId, req.SinceNow, req.UntilNow, req.ReverseOrder); err != nil {
return err
}
// Subscribe to new message events if requested
var newEvents <-chan interface{}
if req.UntilId == nil && !req.UntilNow {
messageStoreSub, err := cg.MessageStore().EventBus().Subscribe([]interface{}{
new(*protocoltypes.GroupMessageEvent),
}, eventbus.Name("weshnet/api/group-message-list"))
if err != nil {
return fmt.Errorf("unable to subscribe to new events")
}
defer messageStoreSub.Close()
newEvents = messageStoreSub.Out()
}
// Subscribe to previous message events and stream them if requested
previousEvents := make(chan *protocoltypes.GroupMessageEvent)
if !req.SinceNow {
pevt, err := cg.MessageStore().ListEvents(ctx, req.SinceId, req.UntilId, req.ReverseOrder)
if err != nil {
return err
}
go func() {
for {
var evt *protocoltypes.GroupMessageEvent
select {
case <-ctx.Done():
return
case evt = <-pevt:
}
if evt == nil {
// if we don't want to stream new event, cancel the process
if req.UntilNow {
cancel()
} else {
previousEvents <- &protocoltypes.GroupMessageEvent{EventContext: nil}
}
cg.logger.Debug("GroupMessageList: previous events stream ended")
return
}
previousEvents <- evt
}
}()
}
// Subscribe to new message events and stream them if requested
// listPreviouseMessageDone := false
for {
var event interface{}
select {
case <-ctx.Done():
return nil
case event = <-previousEvents:
case event = <-newEvents:
}
msg := event.(*protocoltypes.GroupMessageEvent)
if msg.EventContext == nil {
continue
}
if err := sub.Send(msg); err != nil {
return err
}
cg.logger.Info("service - message store - sent 1 event from log subscription")
}
}