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event-emitters.go
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/
event-emitters.go
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package cmd
import (
"context"
"github.com/cosmos/cosmos-sdk/client"
"github.com/ovrclk/akash/events"
"github.com/ovrclk/akash/pubsub"
"golang.org/x/sync/errgroup"
)
// EventEmitter is a type that describes event emitter functions
type EventEmitter func(context.Context, ...EventHandler) error
// ChainEmitter runs the passed EventHandlers just on the on chain event stream
func ChainEmitter(ctx context.Context, clientCtx client.Context, ehs ...EventHandler) (err error) {
// Instantiate and start tendermint RPC client
if err = clientCtx.Client.Start(); err != nil {
return err
}
// Start the pubsub bus
bus := pubsub.NewBus()
defer bus.Close()
// Subscribe to the bus events
subscriber, err := bus.Subscribe()
if err != nil {
return err
}
// Initialize a new error group
group, ctx := errgroup.WithContext(ctx)
// Publish chain events to the pubsub bus
group.Go(func() error {
return events.Publish(ctx, clientCtx.Client, "akash-deploy", bus)
})
// Handle all the events coming out of the bus
group.Go(func() error {
for {
select {
case <-ctx.Done():
return nil
case <-subscriber.Done():
return nil
case ev := <-subscriber.Events():
for _, eh := range ehs {
if err = eh(ev); err != nil {
return err
}
}
}
}
})
return group.Wait()
}