micro/client/retry.go

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package client
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import (
"context"
"go.unistack.org/micro/v4/errors"
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)
// RetryFunc 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)
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// RetryAlways always retry on error
func RetryAlways(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
return true, nil
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}
// RetryNever never retry on error
func RetryNever(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
return false, nil
}
// RetryOnError retries a request on a 500 or 408 (timeout) error
func RetryOnError(_ context.Context, _ Request, _ int, err error) (bool, error) {
if err == nil {
return false, nil
}
me := errors.FromError(err)
switch me.Code {
// retry on timeout or internal server error
case 408, 500:
return true, nil
}
return false, nil
}
// RetryOnErrors retries a request on specified error codes
func RetryOnErrors(codes ...int32) RetryFunc {
return func(_ context.Context, _ Request, _ int, err error) (bool, error) {
if err == nil {
return false, nil
}
me := errors.FromError(err)
for _, code := range codes {
if me.Code == code {
return true, nil
}
}
return false, nil
}
}