// Initialize initializes the service.
func (s *Service) Initialize() {
if s.Config == nil {
s.Config = &aws.Config{}
}
if s.Config.HTTPClient == nil {
s.Config.HTTPClient = http.DefaultClient
}
if s.RetryRules == nil {
s.RetryRules = retryRules
}
if s.ShouldRetry == nil {
s.ShouldRetry = shouldRetry
}
s.DefaultMaxRetries = 3
s.Handlers.Validate.PushBack(ValidateEndpointHandler)
s.Handlers.Build.PushBack(UserAgentHandler)
s.Handlers.Sign.PushBack(BuildContentLength)
s.Handlers.Send.PushBack(SendHandler)
s.Handlers.AfterRetry.PushBack(AfterRetryHandler)
s.Handlers.ValidateResponse.PushBack(ValidateResponseHandler)
s.AddDebugHandlers()
s.buildEndpoint()
if !aws.BoolValue(s.Config.DisableParamValidation) {
s.Handlers.Validate.PushBack(ValidateParameters)
}
}
// hostStyleBucketName returns true if the request should put the bucket in
// the host. This is false if S3ForcePathStyle is explicitly set or if the
// bucket is not DNS compatible.
func hostStyleBucketName(r *service.Request, bucket string) bool {
if aws.BoolValue(r.Config.S3ForcePathStyle) {
return false
}
// Bucket might be DNS compatible but dots in the hostname will fail
// certificate validation, so do not use host-style.
if r.HTTPRequest.URL.Scheme == "https" && strings.Contains(bucket, ".") {
return false
}
// Use host-style if the bucket is DNS compatible
return dnsCompatibleBucketName(bucket)
}
func setupChecksumValidation(r *service.Request) {
if aws.BoolValue(r.Config.DisableComputeChecksums) {
return
}
switch r.Operation.Name {
case opSendMessage:
r.Handlers.Unmarshal.PushBack(verifySendMessage)
case opSendMessageBatch:
r.Handlers.Unmarshal.PushBack(verifySendMessageBatch)
case opReceiveMessage:
r.Handlers.Unmarshal.PushBack(verifyReceiveMessage)
}
}
// buildEndpoint builds the endpoint values the service will use to make requests with.
func (s *Service) buildEndpoint() {
if aws.StringValue(s.Config.Endpoint) != "" {
s.Endpoint = *s.Config.Endpoint
} else if s.Endpoint == "" {
s.Endpoint, s.SigningRegion =
endpoints.EndpointForRegion(s.ServiceName, aws.StringValue(s.Config.Region))
}
if s.Endpoint != "" && !schemeRE.MatchString(s.Endpoint) {
scheme := "https"
if aws.BoolValue(s.Config.DisableSSL) {
scheme = "http"
}
s.Endpoint = scheme + "://" + s.Endpoint
}
}
func validateCRC32(r *service.Request) {
if r.Error != nil {
return // already have an error, no need to verify CRC
}
// Checksum validation is off, skip
if aws.BoolValue(r.Service.Config.DisableComputeChecksums) {
return
}
// Try to get CRC from response
header := r.HTTPResponse.Header.Get("X-Amz-Crc32")
if header == "" {
return // No header, skip
}
expected, err := strconv.ParseUint(header, 10, 32)
if err != nil {
return // Could not determine CRC value, skip
}
buf, err := drainBody(r.HTTPResponse.Body)
if err != nil { // failed to read the response body, skip
return
}
// Reset body for subsequent reads
r.HTTPResponse.Body = ioutil.NopCloser(bytes.NewReader(buf.Bytes()))
// Compute the CRC checksum
crc := crc32.ChecksumIEEE(buf.Bytes())
if crc != uint32(expected) {
// CRC does not match, set a retryable error
r.Retryable = aws.Bool(true)
r.Error = awserr.New("CRC32CheckFailed", "CRC32 integrity check failed", nil)
}
}
// WillRetry returns if the request's can be retried.
func (r *Request) WillRetry() bool {
return r.Error != nil && aws.BoolValue(r.Retryable) && r.RetryCount < r.Service.MaxRetries()
}
// Send will send the request returning error if errors are encountered.
//
// Send will sign the request prior to sending. All Send Handlers will
// be executed in the order they were set.
func (r *Request) Send() error {
for {
r.Sign()
if r.Error != nil {
return r.Error
}
if aws.BoolValue(r.Retryable) {
if r.Config.LogLevel.Matches(aws.LogDebugWithRequestRetries) {
r.Config.Logger.Log(fmt.Sprintf("DEBUG: Retrying Request %s/%s, attempt %d",
r.ServiceName, r.Operation.Name, r.RetryCount))
}
// Re-seek the body back to the original point in for a retry so that
// send will send the body's contents again in the upcoming request.
r.Body.Seek(r.bodyStart, 0)
r.HTTPRequest.Body = ioutil.NopCloser(r.Body)
}
r.Retryable = nil
r.Handlers.Send.Run(r)
if r.Error != nil {
err := r.Error
r.Handlers.Retry.Run(r)
r.Handlers.AfterRetry.Run(r)
if r.Error != nil {
debugLogReqError(r, "Send Request", false, r.Error)
return r.Error
}
debugLogReqError(r, "Send Request", true, err)
continue
}
r.Handlers.UnmarshalMeta.Run(r)
r.Handlers.ValidateResponse.Run(r)
if r.Error != nil {
err := r.Error
r.Handlers.UnmarshalError.Run(r)
r.Handlers.Retry.Run(r)
r.Handlers.AfterRetry.Run(r)
if r.Error != nil {
debugLogReqError(r, "Validate Response", false, r.Error)
return r.Error
}
debugLogReqError(r, "Validate Response", true, err)
continue
}
r.Handlers.Unmarshal.Run(r)
if r.Error != nil {
err := r.Error
r.Handlers.Retry.Run(r)
r.Handlers.AfterRetry.Run(r)
if r.Error != nil {
debugLogReqError(r, "Unmarshal Response", false, r.Error)
return r.Error
}
debugLogReqError(r, "Unmarshal Response", true, err)
continue
}
break
}
return nil
}