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package request
import (
"io"
"time"
"github.com/aws/aws-sdk-go/aws/awserr"
)
var timeoutErr = awserr.New(
ErrCodeResponseTimeout,
"read on body has reached the timeout limit",
nil,
)
type readResult struct {
n int
err error
}
// timeoutReadCloser will handle body reads that take too long.
// We will return a ErrReadTimeout error if a timeout occurs.
type timeoutReadCloser struct {
reader io.ReadCloser
duration time.Duration
}
// Read will spin off a goroutine to call the reader's Read method. We will
// select on the timer's channel or the read's channel. Whoever completes first
// will be returned.
func (r *timeoutReadCloser) Read(b []byte) (int, error) {
timer := time.NewTimer(r.duration)
c := make(chan readResult, 1)
go func() {
n, err := r.reader.Read(b)
timer.Stop()
c <- readResult{n: n, err: err}
}()
select {
case data := <-c:
return data.n, data.err
case <-timer.C:
return 0, timeoutErr
}
}
func (r *timeoutReadCloser) Close() error {
return r.reader.Close()
}
const (
// HandlerResponseTimeout is what we use to signify the name of the
// response timeout handler.
HandlerResponseTimeout = "ResponseTimeoutHandler"
)
// adaptToResponseTimeoutError is a handler that will replace any top level error
// to a ErrCodeResponseTimeout, if its child is that.
func adaptToResponseTimeoutError(req *Request) {
if err, ok := req.Error.(awserr.Error); ok {
aerr, ok := err.OrigErr().(awserr.Error)
if ok && aerr.Code() == ErrCodeResponseTimeout {
req.Error = aerr
}
}
}
// WithResponseReadTimeout is a request option that will wrap the body in a timeout read closer.
// This will allow for per read timeouts. If a timeout occurred, we will return the
// ErrCodeResponseTimeout.
//
// svc.PutObjectWithContext(ctx, params, request.WithTimeoutReadCloser(30 * time.Second)
func WithResponseReadTimeout(duration time.Duration) Option {
return func(r *Request) {
var timeoutHandler = NamedHandler{
HandlerResponseTimeout,
func(req *Request) {
req.HTTPResponse.Body = &timeoutReadCloser{
reader: req.HTTPResponse.Body,
duration: duration,
}
}}
// remove the handler so we are not stomping over any new durations.
r.Handlers.Send.RemoveByName(HandlerResponseTimeout)
r.Handlers.Send.PushBackNamed(timeoutHandler)
r.Handlers.Unmarshal.PushBack(adaptToResponseTimeoutError)
r.Handlers.UnmarshalError.PushBack(adaptToResponseTimeoutError)
}
}