55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package paychmgr
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import (
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"github.com/hannahhoward/go-pubsub"
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"github.com/ipfs/go-cid"
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"golang.org/x/xerrors"
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)
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type msgListeners struct {
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ps *pubsub.PubSub
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}
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type msgCompleteEvt struct {
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mcid cid.Cid
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err error
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}
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type subscriberFn func(msgCompleteEvt)
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func newMsgListeners() msgListeners {
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ps := pubsub.New(func(event pubsub.Event, subFn pubsub.SubscriberFn) error {
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evt, ok := event.(msgCompleteEvt)
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if !ok {
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return xerrors.Errorf("wrong type of event")
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}
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sub, ok := subFn.(subscriberFn)
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if !ok {
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return xerrors.Errorf("wrong type of subscriber")
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}
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sub(evt)
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return nil
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})
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return msgListeners{ps: ps}
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}
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// onMsgComplete registers a callback for when the message with the given cid
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// completes
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func (ml *msgListeners) onMsgComplete(mcid cid.Cid, cb func(error)) pubsub.Unsubscribe {
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var fn subscriberFn = func(evt msgCompleteEvt) {
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if mcid.Equals(evt.mcid) {
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cb(evt.err)
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}
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}
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return ml.ps.Subscribe(fn)
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}
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// fireMsgComplete is called when a message completes
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func (ml *msgListeners) fireMsgComplete(mcid cid.Cid, err error) {
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e := ml.ps.Publish(msgCompleteEvt{mcid: mcid, err: err})
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if e != nil {
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// In theory we shouldn't ever get an error here
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log.Errorf("unexpected error publishing message complete: %s", e)
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}
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}
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