github.com/tickoalcantara12/micro/v3@v3.0.0-20221007104245-9d75b9bcbab9/service/client/retry.go (about)

     1  // Copyright 2020 Asim Aslam
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     https://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  //
    15  // Original source: github.com/micro/go-micro/v3/client/retry.go
    16  
    17  package client
    18  
    19  import (
    20  	"context"
    21  	"strings"
    22  
    23  	"github.com/tickoalcantara12/micro/v3/service/errors"
    24  )
    25  
    26  // note that returning either false or a non-nil error will result in the call not being retried
    27  type RetryFunc func(ctx context.Context, req Request, retryCount int, err error) (bool, error)
    28  
    29  // RetryAlways always retry on error
    30  func RetryAlways(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
    31  	return true, nil
    32  }
    33  
    34  // RetryOnError retries a request on a 500 or timeout error
    35  func RetryOnError(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
    36  	if err == nil {
    37  		return false, nil
    38  	}
    39  
    40  	e := errors.Parse(err.Error())
    41  	if e == nil {
    42  		return false, nil
    43  	}
    44  
    45  	switch e.Code {
    46  	// retry on timeout or internal server error
    47  	case 408, 500:
    48  		return true, nil
    49  	default:
    50  		return false, nil
    51  	}
    52  }
    53  
    54  // RetryOnConnectFailure will return true if "connection refused" is returned
    55  func RetryOnConnectFailure(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
    56  	if err == nil {
    57  		return false, nil
    58  	}
    59  
    60  	e := errors.Parse(err.Error())
    61  	if e == nil {
    62  		return false, nil
    63  	}
    64  
    65  	if strings.Contains(e.Detail, "connection refused") {
    66  		return true, nil
    67  	}
    68  
    69  	return false, nil
    70  }
    71  
    72  // RetryNever never retries a request
    73  func RetryNever(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
    74  	return false, nil
    75  }