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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package clients
import (
"bytes"
"context"
"fmt"
"io"
"net/http"
"time"
)
type retryClient struct {
client *http.Client
*retryer
}
func (c *retryClient) doWithCustomMarshaller(timeout time.Duration,
req *http.Request, body []byte, decode func([]byte) error,
) (err error) {
ctx, cancel := context.WithTimeout(req.Context(), timeout)
defer cancel()
try := func(ctx context.Context) (bool, error) {
if body != nil {
req.Body = io.NopCloser(bytes.NewReader(body))
}
res, err := c.client.Do(req)
if err != nil {
return ctx.Err() == nil, fmt.Errorf("connect: %w", err)
}
respBody, err := io.ReadAll(res.Body)
if err != nil {
return shouldRetry(res.StatusCode), fmt.Errorf("read response: %w", err)
}
defer res.Body.Close()
if code := res.StatusCode; code != http.StatusOK {
return shouldRetry(code), fmt.Errorf("status code: %v, error: %s", code, respBody)
}
if err := decode(respBody); err != nil {
return false, fmt.Errorf("unmarshal response: %w", err)
}
return false, nil
}
return c.retry(ctx, 9, try)
}
type retryer struct {
minBackOff time.Duration
maxBackOff time.Duration
timeoutUnit time.Duration
}
func newRetryer() *retryer {
return &retryer{
minBackOff: time.Millisecond * 250,
maxBackOff: time.Second * 30,
timeoutUnit: time.Second, // used by unit tests
}
}
func (r *retryer) retry(ctx context.Context, n int, work func(context.Context) (bool, error)) error {
delay := r.minBackOff
for {
keepTrying, err := work(ctx)
if !keepTrying || n < 1 || err == nil {
return err
}
n--
if delay = backOff(delay); delay > r.maxBackOff {
delay = r.maxBackOff
}
timer := time.NewTimer(delay)
select {
case <-ctx.Done():
timer.Stop()
return fmt.Errorf("%v: %w", err, ctx.Err())
case <-timer.C:
}
timer.Stop()
}
}
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