Allow custom health checks

controllers/nginx/healthcheck/main.go

@@ -0,0 +1,101 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 healthcheck
+
+import (
+	"errors"
+	"strconv"
+
+	"k8s.io/kubernetes/pkg/apis/extensions"
+
+	"k8s.io/contrib/ingress/controllers/nginx/nginx"
+)
+
+const (
+	upsMaxFails    = "ingress-nginx.kubernetes.io/upstream-max-fails"
+	upsFailTimeout = "ingress-nginx.kubernetes.io/upstream-fail-timeout"
+)
+
+var (
+	// ErrMissingMaxFails returned error when the ingress does not contains the
+	// max-fails annotation
+	ErrMissingMaxFails = errors.New("max-fails annotations is missing")
+
+	// ErrMissingFailTimeout returned error when the ingress does not contains
+	// the fail-timeout annotation
+	ErrMissingFailTimeout = errors.New("fail-timeout annotations is missing")
+
+	// ErrInvalidNumber returned
+	ErrInvalidNumber = errors.New("the annotation does not contains a number")
+)
+
+// Upstream returns the URL and method to use check the status of
+// the upstream server/s
+type Upstream struct {
+	MaxFails    int
+	FailTimeout int
+}
+
+type ingAnnotations map[string]string
+
+func (a ingAnnotations) maxFails() (int, error) {
+	val, ok := a[upsMaxFails]
+	if !ok {
+		return 0, ErrMissingMaxFails
+	}
+
+	mf, err := strconv.Atoi(val)
+	if err != nil {
+		return 0, ErrInvalidNumber
+	}
+
+	return mf, nil
+}
+
+func (a ingAnnotations) failTimeout() (int, error) {
+	val, ok := a[upsFailTimeout]
+	if !ok {
+		return 0, ErrMissingFailTimeout
+	}
+
+	ft, err := strconv.Atoi(val)
+	if err != nil {
+		return 0, ErrInvalidNumber
+	}
+
+	return ft, nil
+}
+
+// ParseAnnotations parses the annotations contained in the ingress
+// rule used to configure upstream check parameters
+func ParseAnnotations(cfg nginx.NginxConfiguration, ing *extensions.Ingress) *Upstream {
+	if ing.GetAnnotations() == nil {
+		return &Upstream{cfg.UpstreamMaxFails, cfg.UpstreamFailTimeout}
+	}
+
+	mf, err := ingAnnotations(ing.GetAnnotations()).maxFails()
+	if err != nil {
+		mf = cfg.UpstreamMaxFails
+	}
+
+	ft, err := ingAnnotations(ing.GetAnnotations()).failTimeout()
+	if err != nil {
+		ft = cfg.UpstreamFailTimeout
+	}
+
+	return &Upstream{mf, ft}
+}