/
error_handler.go
74 lines (60 loc) · 2.05 KB
/
error_handler.go
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package round_tripper
import (
"fmt"
"net/http"
"code.cloudfoundry.org/gorouter/metrics"
"code.cloudfoundry.org/gorouter/proxy/fails"
"code.cloudfoundry.org/gorouter/proxy/utils"
router_http "code.cloudfoundry.org/gorouter/common/http"
)
type ErrorSpec struct {
Classifier fails.Classifier
Message string
Code int
HandleError func(reporter metrics.ProxyReporter)
}
func handleHostnameMismatch(reporter metrics.ProxyReporter) {
reporter.CaptureBackendInvalidID()
}
func handleSSLHandshake(reporter metrics.ProxyReporter) {
reporter.CaptureBackendTLSHandshakeFailed()
}
func handleUntrustedCert(reporter metrics.ProxyReporter) {
reporter.CaptureBackendInvalidTLSCert()
}
var DefaultErrorSpecs = []ErrorSpec{
{fails.AttemptedTLSWithNonTLSBackend, SSLHandshakeMessage, 525, handleSSLHandshake},
{fails.HostnameMismatch, HostnameErrorMessage, http.StatusServiceUnavailable, handleHostnameMismatch},
{fails.UntrustedCert, InvalidCertificateMessage, 526, handleUntrustedCert},
{fails.RemoteFailedCertCheck, SSLCertRequiredMessage, 496, nil},
{fails.ContextCancelled, ContextCancelledMessage, 499, nil},
{fails.RemoteHandshakeFailure, SSLHandshakeMessage, 525, handleSSLHandshake},
}
type ErrorHandler struct {
MetricReporter metrics.ProxyReporter
ErrorSpecs []ErrorSpec
}
func (eh *ErrorHandler) HandleError(responseWriter utils.ProxyResponseWriter, err error) {
msg := "endpoint_failure"
if err != nil {
msg = fmt.Sprintf("%s (%s)", msg, err)
}
responseWriter.Header().Set(router_http.CfRouterError, msg)
eh.writeErrorCode(err, responseWriter)
responseWriter.Header().Del("Connection")
responseWriter.Done()
}
func (eh *ErrorHandler) writeErrorCode(err error, responseWriter http.ResponseWriter) {
for _, spec := range eh.ErrorSpecs {
if spec.Classifier.Classify(err) {
if spec.HandleError != nil {
spec.HandleError(eh.MetricReporter)
}
http.Error(responseWriter, spec.Message, spec.Code)
return
}
}
// default case
http.Error(responseWriter, BadGatewayMessage, http.StatusBadGateway)
eh.MetricReporter.CaptureBadGateway()
}