corehandlers

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• Variables

Variables

var AfterRetryHandler = request.NamedHandler{Name: "core.AfterRetryHandler", Fn: func(r *request.Request) {

	if r.Retryable == nil {
		r.Retryable = aws.Bool(r.ShouldRetry(r))
	}

	if r.WillRetry() {
		r.RetryDelay = r.RetryRules(r)
		r.Config.SleepDelay(r.RetryDelay)

		if r.IsErrorExpired() {
			r.Config.Credentials.Expire()
		}

		r.RetryCount++
		r.Error = nil
	}
}}

AfterRetryHandler performs final checks to determine if the request should be retried and how long to delay.

var BuildContentLengthHandler = request.NamedHandler{Name: "core.BuildContentLengthHandler", Fn: func(r *request.Request) {
	var length int64

	if slength := r.HTTPRequest.Header.Get("Content-Length"); slength != "" {
		length, _ = strconv.ParseInt(slength, 10, 64)
	} else {
		switch body := r.Body.(type) {
		case nil:
			length = 0
		case lener:
			length = int64(body.Len())
		case io.Seeker:
			r.BodyStart, _ = body.Seek(0, 1)
			end, _ := body.Seek(0, 2)
			body.Seek(r.BodyStart, 0)
			length = end - r.BodyStart
		default:
			panic("Cannot get length of body, must provide `ContentLength`")
		}
	}

	if length > 0 {
		r.HTTPRequest.ContentLength = length
		r.HTTPRequest.Header.Set("Content-Length", fmt.Sprintf("%d", length))
	} else {
		r.HTTPRequest.ContentLength = 0
		r.HTTPRequest.Header.Del("Content-Length")
	}
}}

BuildContentLengthHandler builds the content length of a request based on the body, or will use the HTTPRequest.Header's "Content-Length" if defined. If unable to determine request body length and no "Content-Length" was specified it will panic.

The Content-Length will only be aded to the request if the length of the body is greater than 0. If the body is empty or the current `Content-Length` header is <= 0, the header will also be stripped.

var SDKVersionUserAgentHandler = request.NamedHandler{
	Name: "core.SDKVersionUserAgentHandler",
	Fn: request.MakeAddToUserAgentHandler(aws.SDKName, aws.SDKVersion,
		runtime.Version(), runtime.GOOS, runtime.GOARCH),
}

SDKVersionUserAgentHandler is a request handler for adding the SDK Version to the user agent.

var SendHandler = request.NamedHandler{Name: "core.SendHandler", Fn: func(r *request.Request) {
	var err error
	r.HTTPResponse, err = r.Config.HTTPClient.Do(r.HTTPRequest)
	if err != nil {

		if r.HTTPResponse != nil {
			r.HTTPResponse.Body.Close()
		}

		if e, ok := err.(*url.Error); ok && e.Err != nil {
			if s := reStatusCode.FindStringSubmatch(e.Err.Error()); s != nil {
				code, _ := strconv.ParseInt(s[1], 10, 64)
				r.HTTPResponse = &http.Response{
					StatusCode: int(code),
					Status:     http.StatusText(int(code)),
					Body:       ioutil.NopCloser(bytes.NewReader([]byte{})),
				}
				return
			}
		}
		if r.HTTPResponse == nil {

			r.HTTPResponse = &http.Response{
				StatusCode: int(0),
				Status:     http.StatusText(int(0)),
				Body:       ioutil.NopCloser(bytes.NewReader([]byte{})),
			}
		}

		r.Error = awserr.New("RequestError", "send request failed", err)
		r.Retryable = aws.Bool(true)
	}
}}

SendHandler is a request handler to send service request using HTTP client.

var ValidateEndpointHandler = request.NamedHandler{Name: "core.ValidateEndpointHandler", Fn: func(r *request.Request) {
	if r.ClientInfo.SigningRegion == "" && aws.StringValue(r.Config.Region) == "" {
		r.Error = aws.ErrMissingRegion
	} else if r.ClientInfo.Endpoint == "" {
		r.Error = aws.ErrMissingEndpoint
	}
}}

ValidateEndpointHandler is a request handler to validate a request had the appropriate Region and Endpoint set. Will set r.Error if the endpoint or region is not valid.

var ValidateParametersHandler = request.NamedHandler{Name: "core.ValidateParametersHandler", Fn: func(r *request.Request) {
	if !r.ParamsFilled() {
		return
	}

	if v, ok := r.Params.(request.Validator); ok {
		if err := v.Validate(); err != nil {
			r.Error = err
		}
	}
}}

ValidateParametersHandler is a request handler to validate the input parameters. Validating parameters only has meaning if done prior to the request being sent.

var ValidateReqSigHandler = request.NamedHandler{
	Name: "core.ValidateReqSigHandler",
	Fn: func(r *request.Request) {

		if r.Config.Credentials == credentials.AnonymousCredentials {
			return
		}

		signedTime := r.Time
		if !r.LastSignedAt.IsZero() {
			signedTime = r.LastSignedAt
		}

		if signedTime.Add(10 * time.Minute).After(time.Now()) {
			return
		}

		fmt.Println("request expired, resigning")
		r.Sign()
	},
}

ValidateReqSigHandler is a request handler to ensure that the request's signature doesn't expire before it is sent. This can happen when a request is built and signed signficantly before it is sent. Or significant delays occur whne retrying requests that would cause the signature to expire.

var ValidateResponseHandler = request.NamedHandler{Name: "core.ValidateResponseHandler", Fn: func(r *request.Request) {
	if r.HTTPResponse.StatusCode == 0 || r.HTTPResponse.StatusCode >= 300 {

		r.Error = awserr.New("UnknownError", "unknown error", nil)
	}
}}

ValidateResponseHandler is a request handler to validate service response.