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annotations.go
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annotations.go
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// Copyright © 2018 Heptio
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package contour
import (
"strconv"
"strings"
"time"
"github.com/gogo/protobuf/types"
"k8s.io/api/extensions/v1beta1"
)
const (
// set docs/annotations.md for details of how these annotations
// are applied by Contour.
annotationRequestTimeout = "contour.heptio.com/request-timeout"
annotationWebsocketRoutes = "contour.heptio.com/websocket-routes"
// By default envoy applies a 15 second timeout to all backend requests.
// The explicit value 0 turns off the timeout, implying "never time out"
// https://www.envoyproxy.io/docs/envoy/v1.5.0/api-v2/rds.proto#routeaction
infiniteTimeout = time.Duration(0)
)
// parseAnnotationTimeout parses the annotations map for a contour.heptio.com/request-timeout
// value. If the value is not present, false is returned and the timeout value should be
// ignored. If the value is present, but malformed, the timeout value is valid, and represents
// infinite timeout.
func parseAnnotationTimeout(annotations map[string]string, annotation string) (time.Duration, bool) {
timeoutStr := annotations[annotationRequestTimeout]
// Error or unspecified is interpreted as no timeout specified, use envoy defaults
if timeoutStr == "" {
return 0, false
}
// Interpret "infinity" explicitly as an infinite timeout, which envoy config
// expects as a timeout of 0. This could be specified with the duration string
// "0s" but want to give an explicit out for operators.
if timeoutStr == "infinity" {
return infiniteTimeout, true
}
timeoutParsed, err := time.ParseDuration(timeoutStr)
if err != nil {
// TODO(cmalonty) plumb a logger in here so we can log this error.
// Assuming infinite duration is going to surprise people less for
// a not-parseable duration than a implicit 15 second one.
return infiniteTimeout, true
}
return timeoutParsed, true
}
// parseAnnotationUint32 parsers the annotation map for the supplied annotation key.
// If the value is not present, or malformed, then nil is returned.
func parseAnnotationUInt32(annotations map[string]string, annotation string) *types.UInt32Value {
v, err := strconv.ParseUint(annotations[annotation], 10, 32)
if err != nil {
return nil
}
return &types.UInt32Value{Value: uint32(v)}
}
// httpAllowed returns true unless the kubernetes.io/ingress.allow-http annotation is
// present and set to false.
func httpAllowed(i *v1beta1.Ingress) bool {
return !(i.Annotations["kubernetes.io/ingress.allow-http"] == "false")
}
// websocketRoutes returns a map of websocket routes. If the value is not present, or
// malformed, then an empty map is returned.
func websocketRoutes(i *v1beta1.Ingress) map[string]*types.BoolValue {
routes := make(map[string]*types.BoolValue)
for _, v := range strings.Split(i.Annotations[annotationWebsocketRoutes], ",") {
route := strings.TrimSpace(v)
if route != "" {
routes[route] = &types.BoolValue{Value: true}
}
}
return routes
}