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retry_clients.go
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/
retry_clients.go
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package httpclient
import (
"net/http"
"time"
"github.com/cloudfoundry/bosh-utils/errors"
boshlog "github.com/cloudfoundry/bosh-utils/logger"
boshretry "github.com/cloudfoundry/bosh-utils/retrystrategy"
)
type retryClient struct {
delegate Client
maxAttempts uint
retryDelay time.Duration
logger boshlog.Logger
isResponseAttemptable func(*http.Response, error) (bool, error)
}
func NewRetryClient(
delegate Client,
maxAttempts uint,
retryDelay time.Duration,
logger boshlog.Logger,
) Client {
return &retryClient{
delegate: delegate,
maxAttempts: maxAttempts,
retryDelay: retryDelay,
logger: logger,
isResponseAttemptable: nil,
}
}
func NewNetworkSafeRetryClient(
delegate Client,
maxAttempts uint,
retryDelay time.Duration,
logger boshlog.Logger,
) Client {
return &retryClient{
delegate: delegate,
maxAttempts: maxAttempts,
retryDelay: retryDelay,
logger: logger,
isResponseAttemptable: func(resp *http.Response, err error) (bool, error) {
if err != nil || ((resp.Request.Method == "GET" || resp.Request.Method == "HEAD") && (resp.StatusCode == http.StatusGatewayTimeout || resp.StatusCode == http.StatusServiceUnavailable || resp.StatusCode == http.StatusBadGateway)) {
return true, errors.WrapError(err, "Retry")
}
return false, nil
},
}
}
func (r *retryClient) Do(req *http.Request) (*http.Response, error) {
requestRetryable := NewRequestRetryable(req, r.delegate, r.logger, r.isResponseAttemptable)
retryStrategy := boshretry.NewAttemptRetryStrategy(int(r.maxAttempts), r.retryDelay, requestRetryable, r.logger)
err := retryStrategy.Try()
return requestRetryable.Response(), err
}