117 lines
3.4 KiB
Go
117 lines
3.4 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
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 sessionaffinity
|
|
|
|
import (
|
|
"regexp"
|
|
|
|
"github.com/golang/glog"
|
|
|
|
extensions "k8s.io/api/extensions/v1beta1"
|
|
|
|
"k8s.io/ingress-nginx/internal/ingress/annotations/parser"
|
|
"k8s.io/ingress-nginx/internal/ingress/resolver"
|
|
)
|
|
|
|
const (
|
|
annotationAffinityType = "affinity"
|
|
// If a cookie with this name exists,
|
|
// its value is used as an index into the list of available backends.
|
|
annotationAffinityCookieName = "session-cookie-name"
|
|
|
|
defaultAffinityCookieName = "INGRESSCOOKIE"
|
|
|
|
// This is the algorithm used by nginx to generate a value for the session cookie, if
|
|
// one isn't supplied and affinity is set to "cookie".
|
|
annotationAffinityCookieHash = "session-cookie-hash"
|
|
defaultAffinityCookieHash = "md5"
|
|
)
|
|
|
|
var (
|
|
affinityCookieHashRegex = regexp.MustCompile(`^(index|md5|sha1)$`)
|
|
)
|
|
|
|
// Config describes the per ingress session affinity config
|
|
type Config struct {
|
|
// The type of affinity that will be used
|
|
Type string `json:"type"`
|
|
Cookie
|
|
}
|
|
|
|
// Cookie describes the Config of cookie type affinity
|
|
type Cookie struct {
|
|
// The name of the cookie that will be used in case of cookie affinity type.
|
|
Name string `json:"name"`
|
|
// The hash that will be used to encode the cookie in case of cookie affinity type
|
|
Hash string `json:"hash"`
|
|
}
|
|
|
|
// cookieAffinityParse gets the annotation values related to Cookie Affinity
|
|
// It also sets default values when no value or incorrect value is found
|
|
func (a affinity) cookieAffinityParse(ing *extensions.Ingress) *Cookie {
|
|
sn, err := parser.GetStringAnnotation(annotationAffinityCookieName, ing, a.r)
|
|
|
|
if err != nil || sn == "" {
|
|
glog.V(3).Infof("Ingress %v: No value found in annotation %v. Using the default %v", ing.Name, annotationAffinityCookieName, defaultAffinityCookieName)
|
|
sn = defaultAffinityCookieName
|
|
}
|
|
|
|
sh, err := parser.GetStringAnnotation(annotationAffinityCookieHash, ing, a.r)
|
|
|
|
if err != nil || !affinityCookieHashRegex.MatchString(sh) {
|
|
glog.V(3).Infof("Invalid or no annotation value found in Ingress %v: %v. Setting it to default %v", ing.Name, annotationAffinityCookieHash, defaultAffinityCookieHash)
|
|
sh = defaultAffinityCookieHash
|
|
}
|
|
|
|
return &Cookie{
|
|
Name: sn,
|
|
Hash: sh,
|
|
}
|
|
}
|
|
|
|
// NewParser creates a new Affinity annotation parser
|
|
func NewParser(r resolver.Resolver) parser.IngressAnnotation {
|
|
return affinity{r}
|
|
}
|
|
|
|
type affinity struct {
|
|
r resolver.Resolver
|
|
}
|
|
|
|
// ParseAnnotations parses the annotations contained in the ingress
|
|
// rule used to configure the affinity directives
|
|
func (a affinity) Parse(ing *extensions.Ingress) (interface{}, error) {
|
|
cookie := &Cookie{}
|
|
// Check the type of affinity that will be used
|
|
at, err := parser.GetStringAnnotation(annotationAffinityType, ing, a.r)
|
|
if err != nil {
|
|
at = ""
|
|
}
|
|
|
|
switch at {
|
|
case "cookie":
|
|
cookie = a.cookieAffinityParse(ing)
|
|
default:
|
|
glog.V(3).Infof("No default affinity was found for Ingress %v", ing.Name)
|
|
|
|
}
|
|
|
|
return &Config{
|
|
Type: at,
|
|
Cookie: *cookie,
|
|
}, nil
|
|
}
|