github.com/jghiloni/cli@v6.28.1-0.20170628223758-0ce05fe032a2+incompatible/api/cloudcontroller/wrapper/retry_request.go (about)

     1  package wrapper
     2  
     3  import (
     4  	"net/http"
     5  
     6  	"code.cloudfoundry.org/cli/api/cloudcontroller"
     7  	"code.cloudfoundry.org/cli/api/cloudcontroller/ccerror"
     8  )
     9  
    10  // RetryRequest is a wrapper that retries failed requests if they contain a 5XX
    11  // status code.
    12  type RetryRequest struct {
    13  	maxRetries int
    14  	connection cloudcontroller.Connection
    15  }
    16  
    17  // NewRetryRequest returns a pointer to a RetryRequest wrapper.
    18  func NewRetryRequest(maxRetries int) *RetryRequest {
    19  	return &RetryRequest{
    20  		maxRetries: maxRetries,
    21  	}
    22  }
    23  
    24  // Wrap sets the connection in the RetryRequest and returns itself.
    25  func (retry *RetryRequest) Wrap(innerconnection cloudcontroller.Connection) cloudcontroller.Connection {
    26  	retry.connection = innerconnection
    27  	return retry
    28  }
    29  
    30  // Make retries the request if it comes back with a 5XX status code.
    31  func (retry *RetryRequest) Make(request *cloudcontroller.Request, passedResponse *cloudcontroller.Response) error {
    32  	var err error
    33  
    34  	for i := 0; i < retry.maxRetries+1; i += 1 {
    35  		err = retry.connection.Make(request, passedResponse)
    36  		if err == nil {
    37  			return nil
    38  		}
    39  
    40  		// do not retry if the request method is POST, or not one of the following
    41  		// http status codes: 500, 502, 503, 504
    42  		if request.Method == http.MethodPost ||
    43  			passedResponse.HTTPResponse != nil &&
    44  				passedResponse.HTTPResponse.StatusCode != http.StatusInternalServerError &&
    45  				passedResponse.HTTPResponse.StatusCode != http.StatusBadGateway &&
    46  				passedResponse.HTTPResponse.StatusCode != http.StatusServiceUnavailable &&
    47  				passedResponse.HTTPResponse.StatusCode != http.StatusGatewayTimeout {
    48  			break
    49  		}
    50  
    51  		// Reset the request body prior to the next retry
    52  		resetErr := request.ResetBody()
    53  		if resetErr != nil {
    54  			if _, ok := resetErr.(ccerror.PipeSeekError); ok {
    55  				return ccerror.PipeSeekError{Err: err}
    56  			}
    57  			return resetErr
    58  		}
    59  	}
    60  	return err
    61  }