76 lines
2 KiB
Go
76 lines
2 KiB
Go
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/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package canary
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import (
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extensions "k8s.io/api/extensions/v1beta1"
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"k8s.io/ingress-nginx/internal/ingress/annotations/parser"
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"k8s.io/ingress-nginx/internal/ingress/errors"
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"k8s.io/ingress-nginx/internal/ingress/resolver"
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)
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type canary struct {
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r resolver.Resolver
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}
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// Config returns the configuration rules for setting up the Canary
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type Config struct {
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Enabled bool
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Weight int
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Header string
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Cookie string
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}
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// NewParser parses the ingress for canary related annotations
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func NewParser(r resolver.Resolver) parser.IngressAnnotation {
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return canary{r}
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}
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// Parse parses the annotations contained in the ingress
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// rule used to indicate if the canary should be enabled and with what config
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func (c canary) Parse(ing *extensions.Ingress) (interface{}, error) {
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config := &Config{}
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var err error
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config.Enabled, err = parser.GetBoolAnnotation("canary", ing)
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if err != nil {
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config.Enabled = false
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}
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config.Weight, err = parser.GetIntAnnotation("canary-weight", ing)
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if err != nil {
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config.Weight = 0
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}
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config.Header, err = parser.GetStringAnnotation("canary-by-header", ing)
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if err != nil {
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config.Header = ""
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}
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config.Cookie, err = parser.GetStringAnnotation("canary-by-cookie", ing)
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if err != nil {
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config.Cookie = ""
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}
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if !config.Enabled && (config.Weight > 0 || len(config.Header) > 0 || len(config.Cookie) > 0) {
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return nil, errors.NewInvalidAnnotationConfiguration("canary", "configured but not enabled")
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}
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return config, nil
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}
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