71 lines
1.4 KiB
Go
71 lines
1.4 KiB
Go
package httpu
|
|
|
|
import (
|
|
"net/http"
|
|
"time"
|
|
|
|
"golang.org/x/sync/errgroup"
|
|
)
|
|
|
|
// MultiClient dispatches requests out to all the delegated clients.
|
|
type MultiClient struct {
|
|
// The HTTPU clients to delegate to.
|
|
delegates []ClientInterface
|
|
}
|
|
|
|
var _ ClientInterface = &MultiClient{}
|
|
|
|
// NewMultiClient creates a new MultiClient that delegates to all the given
|
|
// clients.
|
|
func NewMultiClient(delegates []ClientInterface) *MultiClient {
|
|
return &MultiClient{
|
|
delegates: delegates,
|
|
}
|
|
}
|
|
|
|
// Do implements ClientInterface.Do.
|
|
func (mc *MultiClient) Do(
|
|
req *http.Request,
|
|
timeout time.Duration,
|
|
numSends int,
|
|
) ([]*http.Response, error) {
|
|
tasks := &errgroup.Group{}
|
|
|
|
results := make(chan []*http.Response)
|
|
tasks.Go(func() error {
|
|
defer close(results)
|
|
return mc.sendRequests(results, req, timeout, numSends)
|
|
})
|
|
|
|
var responses []*http.Response
|
|
tasks.Go(func() error {
|
|
for rs := range results {
|
|
responses = append(responses, rs...)
|
|
}
|
|
return nil
|
|
})
|
|
|
|
return responses, tasks.Wait()
|
|
}
|
|
|
|
func (mc *MultiClient) sendRequests(
|
|
results chan<-[]*http.Response,
|
|
req *http.Request,
|
|
timeout time.Duration,
|
|
numSends int,
|
|
) error {
|
|
tasks := &errgroup.Group{}
|
|
for _, d := range mc.delegates {
|
|
d := d // copy for closure
|
|
tasks.Go(func() error {
|
|
responses, err := d.Do(req, timeout, numSends)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
results <- responses
|
|
return nil
|
|
})
|
|
}
|
|
return tasks.Wait()
|
|
}
|