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package http
import (
"context"
"fmt"
"io"
"time"
"github.com/aws/smithy-go"
"github.com/aws/smithy-go/middleware"
smithyhttp "github.com/aws/smithy-go/transport/http"
)
type readResult struct {
n int
err error
}
// ResponseTimeoutError is an error when the reads from the response are
// delayed longer than the timeout the read was configured for.
type ResponseTimeoutError struct {
TimeoutDur time.Duration
}
// Timeout returns that the error is was caused by a timeout, and can be
// retried.
func (*ResponseTimeoutError) Timeout() bool { return true }
func (e *ResponseTimeoutError) Error() string {
return fmt.Sprintf("read on body reach timeout limit, %v", e.TimeoutDur)
}
// 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, &ResponseTimeoutError{TimeoutDur: r.duration}
}
}
func (r *timeoutReadCloser) Close() error {
return r.reader.Close()
}
// AddResponseReadTimeoutMiddleware adds a middleware to the stack that wraps the
// response body so that a read that takes too long will return an error.
func AddResponseReadTimeoutMiddleware(stack *middleware.Stack, duration time.Duration) error {
return stack.Deserialize.Add(&readTimeout{duration: duration}, middleware.After)
}
// readTimeout wraps the response body with a timeoutReadCloser
type readTimeout struct {
duration time.Duration
}
// ID returns the id of the middleware
func (*readTimeout) ID() string {
return "ReadResponseTimeout"
}
// HandleDeserialize implements the DeserializeMiddleware interface
func (m *readTimeout) HandleDeserialize(
ctx context.Context, in middleware.DeserializeInput, next middleware.DeserializeHandler,
) (
out middleware.DeserializeOutput, metadata middleware.Metadata, err error,
) {
out, metadata, err = next.HandleDeserialize(ctx, in)
if err != nil {
return out, metadata, err
}
response, ok := out.RawResponse.(*smithyhttp.Response)
if !ok {
return out, metadata, &smithy.DeserializationError{Err: fmt.Errorf("unknown transport type %T", out.RawResponse)}
}
response.Body = &timeoutReadCloser{
reader: response.Body,
duration: m.duration,
}
out.RawResponse = response
return out, metadata, err
}
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