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