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Improve the session affinity feature
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Ricardo Pchevuzinske Katz
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Feb 12, 2017
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| /* | ||
| 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. | ||
| */ | ||
|
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| package sessionaffinity | ||
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| import ( | ||
| "regexp" | ||
|
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| "github.com/golang/glog" | ||
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| "k8s.io/kubernetes/pkg/apis/extensions" | ||
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| "k8s.io/ingress/core/pkg/ingress/annotations/parser" | ||
| ) | ||
|
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| const ( | ||
| annotationAffinityType = "ingress.kubernetes.io/affinity" | ||
| // If a cookie with this name exists, | ||
| // its value is used as an index into the list of available backends. | ||
| annotationAffinityCookieName = "ingress.kubernetes.io/session-cookie-name" | ||
| defaultAffinityCookieName = "route" | ||
| // This is the algorithm used by nginx to generate a value for the session cookie, if | ||
| // one isn't supplied and affintiy is set to "cookie". | ||
| annotationAffinityCookieHash = "ingress.kubernetes.io/session-cookie-hash" | ||
| defaultAffinityCookieHash = "md5" | ||
| ) | ||
|
|
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| var ( | ||
| affinityCookieHashRegex = regexp.MustCompile(`^(index|md5|sha1)$`) | ||
| ) | ||
|
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| // AffinityConfig describes the per ingress session affinity config | ||
| type AffinityConfig struct { | ||
| // The type of affinity that will be used | ||
| AffinityType string `json:"type"` | ||
| CookieAffinityConfig CookieAffinityConfig `json:"cookieconfig"` | ||
| } | ||
|
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| // CookieAffinityConfig describes the Config of cookie type affinity | ||
| type CookieAffinityConfig 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"` | ||
| } | ||
|
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| type affinity struct { | ||
| } | ||
|
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| // CookieAffinityParse gets the annotation values related to Cookie Affinity | ||
| // It also sets default values when no value or incorrect value is found | ||
| func CookieAffinityParse(ing *extensions.Ingress) *CookieAffinityConfig { | ||
|
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| sn, err := parser.GetStringAnnotation(annotationAffinityCookieName, ing) | ||
|
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| 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 | ||
| } | ||
|
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| sh, err := parser.GetStringAnnotation(annotationAffinityCookieHash, ing) | ||
|
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| 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 | ||
| } | ||
|
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| return &CookieAffinityConfig{ | ||
| Name: sn, | ||
| Hash: sh, | ||
| } | ||
| } | ||
|
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| // NewParser creates a new Affinity annotation parser | ||
| func NewParser() parser.IngressAnnotation { | ||
| return affinity{} | ||
| } | ||
|
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| // ParseAnnotations parses the annotations contained in the ingress | ||
| // rule used to configure the affinity directives | ||
| func (a affinity) Parse(ing *extensions.Ingress) (interface{}, error) { | ||
|
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| var cookieAffinityConfig *CookieAffinityConfig | ||
| cookieAffinityConfig = &CookieAffinityConfig{} | ||
|
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| // Check the type of affinity that will be used | ||
| at, err := parser.GetStringAnnotation(annotationAffinityType, ing) | ||
| if err != nil { | ||
| at = "" | ||
| } | ||
| //cookieAffinityConfig = CookieAffinityParse(ing) | ||
| switch at { | ||
| case "cookie": | ||
| cookieAffinityConfig = CookieAffinityParse(ing) | ||
|
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| default: | ||
| glog.V(3).Infof("No default affinity was found for Ingress %v", ing.Name) | ||
|
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| } | ||
| return &AffinityConfig{ | ||
| AffinityType: at, | ||
| CookieAffinityConfig: *cookieAffinityConfig, | ||
| }, nil | ||
|
|
||
| } |
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