102 lines
2.5 KiB
Go
102 lines
2.5 KiB
Go
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/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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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 healthcheck
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import (
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"errors"
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"strconv"
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"k8s.io/kubernetes/pkg/apis/extensions"
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"k8s.io/contrib/ingress/controllers/nginx/nginx"
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)
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const (
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upsMaxFails = "ingress-nginx.kubernetes.io/upstream-max-fails"
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upsFailTimeout = "ingress-nginx.kubernetes.io/upstream-fail-timeout"
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)
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var (
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// ErrMissingMaxFails returned error when the ingress does not contains the
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// max-fails annotation
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ErrMissingMaxFails = errors.New("max-fails annotations is missing")
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// ErrMissingFailTimeout returned error when the ingress does not contains
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// the fail-timeout annotation
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ErrMissingFailTimeout = errors.New("fail-timeout annotations is missing")
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// ErrInvalidNumber returned
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ErrInvalidNumber = errors.New("the annotation does not contains a number")
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)
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// Upstream returns the URL and method to use check the status of
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// the upstream server/s
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type Upstream struct {
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MaxFails int
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FailTimeout int
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}
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type ingAnnotations map[string]string
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func (a ingAnnotations) maxFails() (int, error) {
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val, ok := a[upsMaxFails]
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if !ok {
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return 0, ErrMissingMaxFails
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}
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mf, err := strconv.Atoi(val)
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if err != nil {
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return 0, ErrInvalidNumber
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}
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return mf, nil
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}
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func (a ingAnnotations) failTimeout() (int, error) {
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val, ok := a[upsFailTimeout]
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if !ok {
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return 0, ErrMissingFailTimeout
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}
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ft, err := strconv.Atoi(val)
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if err != nil {
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return 0, ErrInvalidNumber
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}
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return ft, nil
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}
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// ParseAnnotations parses the annotations contained in the ingress
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// rule used to configure upstream check parameters
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func ParseAnnotations(cfg nginx.NginxConfiguration, ing *extensions.Ingress) *Upstream {
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if ing.GetAnnotations() == nil {
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return &Upstream{cfg.UpstreamMaxFails, cfg.UpstreamFailTimeout}
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}
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mf, err := ingAnnotations(ing.GetAnnotations()).maxFails()
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if err != nil {
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mf = cfg.UpstreamMaxFails
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}
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ft, err := ingAnnotations(ing.GetAnnotations()).failTimeout()
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if err != nil {
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ft = cfg.UpstreamFailTimeout
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}
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return &Upstream{mf, ft}
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}
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