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syncRetrieveResource.go
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syncRetrieveResource.go
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package client
import (
"context"
"fmt"
"github.com/plgd-dev/hub/v2/pkg/log"
"github.com/plgd-dev/hub/v2/resource-aggregate/commands"
"github.com/plgd-dev/hub/v2/resource-aggregate/cqrs/eventbus"
"github.com/plgd-dev/hub/v2/resource-aggregate/cqrs/utils"
"github.com/plgd-dev/hub/v2/resource-aggregate/events"
)
type retrieveHandler struct {
correlationID string
res chan *events.ResourceRetrieved
}
func newRetrieveHandler(correlationID string) *retrieveHandler {
return &retrieveHandler{
correlationID: correlationID,
res: make(chan *events.ResourceRetrieved, 1),
}
}
func (h *retrieveHandler) Handle(ctx context.Context, iter eventbus.Iter) (err error) {
for {
ev, ok := iter.Next(ctx)
if !ok {
return iter.Err()
}
var s events.ResourceRetrieved
if ev.EventType() == s.EventType() {
if err := ev.Unmarshal(&s); err != nil {
return err
}
if s.GetAuditContext().GetCorrelationId() == h.correlationID {
select {
case h.res <- &s:
default:
}
return nil
}
}
}
}
func (h *retrieveHandler) recv(ctx context.Context) (*events.ResourceRetrieved, error) {
select {
case <-ctx.Done():
return nil, ctx.Err()
case v := <-h.res:
return v, nil
}
}
// SyncRetrieveResource sends retrieve resource command to resource aggregate and wait for resource retrieved event from eventbus.
func (c *Client) SyncRetrieveResource(ctx context.Context, owner string, req *commands.RetrieveResourceRequest) (*events.ResourceRetrieved, error) {
h := newRetrieveHandler(req.GetCorrelationId())
subject := utils.GetResourceEventSubject(owner, req.GetResourceId(), (&events.ResourceRetrieved{}).EventType())
obs, err := c.subscriber.Subscribe(ctx, req.GetCorrelationId(), subject, h)
if err != nil {
return nil, fmt.Errorf("cannot subscribe to eventbus: %w", err)
}
defer func() {
if err := obs.Close(); err != nil {
log.Errorf("retrieve resource: %w", err)
}
}()
_, err = c.RetrieveResource(ctx, req)
if err != nil {
return nil, err
}
return h.recv(ctx)
}