retry.go

// MIT License
//
// Copyright (c) 2020 Lack
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package client

import (
	"context"

	"github.com/vine-io/vine/lib/errors"
)

// RetryFunc note that returning either false or a non-nil error will result in the call not being retried
type RetryFunc func(ctx context.Context, req Request, retryCount int, err error) (bool, error)

// RetryAlways always retry on error
func RetryAlways(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
	return true, nil
}

// RetryOnError retries a request on a 500 or timeout error
func RetryOnError(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
	if err == nil {
		return false, nil
	}

	e := errors.Parse(err.Error())
	if e == nil {
		return false, nil
	}

	switch e.Code {
	// retry on timeout or internal server error
	case 408, 503:
		return true, nil
	default:
		return false, nil
	}
}