/
health_probes.go
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/
health_probes.go
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// -------------------------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
// --------------------------------------------------------------------------------------------
package appgw
import (
"fmt"
"github.com/Azure/application-gateway-kubernetes-ingress/pkg/annotations"
"github.com/Azure/azure-sdk-for-go/services/network/mgmt/2018-12-01/network"
"github.com/Azure/go-autorest/autorest/to"
"github.com/golang/glog"
v1 "k8s.io/api/core/v1"
"k8s.io/api/extensions/v1beta1"
"k8s.io/apimachinery/pkg/util/intstr"
)
func (builder *appGwConfigBuilder) HealthProbesCollection(ingressList [](*v1beta1.Ingress)) (ConfigBuilder, error) {
backendIDs := make(map[backendIdentifier]interface{})
healthProbeCollection := make(map[string]network.ApplicationGatewayProbe)
for _, ingress := range ingressList {
glog.Infof("[health-probes] Configuring health probes for ingress: '%s'", ingress.Name)
if ingress.Spec.Backend != nil {
glog.Info("[health-probes] Ingress spec has no backend. Adding a default.")
backendIDs[generateBackendID(ingress, nil, nil, ingress.Spec.Backend)] = nil
}
for ruleIdx := range ingress.Spec.Rules {
rule := &ingress.Spec.Rules[ruleIdx]
glog.Infof("[health-probes] Working on ingress rule #%d: host='%s'", ruleIdx+1, rule.Host)
if rule.HTTP == nil {
// skip no http rule
glog.Infof("[health-probes] Skip rule#%d for host '%s' - it has no HTTP rules.", ruleIdx+1, rule.Host)
continue
}
for pathIdx := range rule.HTTP.Paths {
path := &rule.HTTP.Paths[pathIdx]
glog.Infof("[health-probes] Working on path #%d: '%s'", pathIdx+1, path.Path)
backendIDs[generateBackendID(ingress, rule, path, &path.Backend)] = nil
}
}
}
defaultProbe := defaultProbe()
glog.Info("[health-probes] Adding default probe:", *defaultProbe.Name)
healthProbeCollection[*defaultProbe.Name] = defaultProbe
for backendID := range backendIDs {
probe := builder.generateHealthProbe(backendID)
if probe != nil {
glog.Infof("[health-probes] Created probe %s for backend: '%s'", *probe.Name, backendID.Name)
builder.probesMap[backendID] = probe
healthProbeCollection[*probe.Name] = *probe
} else {
glog.Infof("[health-probes] No k8s probe for backend: '%s'; Adding default probe: '%s'", backendID.Name, *defaultProbe.Name)
builder.probesMap[backendID] = &defaultProbe
}
}
glog.Infof("[health-probes] Will create %d App Gateway probes.", len(healthProbeCollection))
probes := make([]network.ApplicationGatewayProbe, 0)
for _, probe := range healthProbeCollection {
probes = append(probes, probe)
}
builder.appGwConfig.Probes = &probes
return builder, nil
}
func (builder *appGwConfigBuilder) generateHealthProbe(backendID backendIdentifier) *network.ApplicationGatewayProbe {
service := builder.k8sContext.GetService(backendID.serviceKey())
if service == nil {
return nil
}
probe := defaultProbe()
probe.Name = to.StringPtr(generateProbeName(backendID.Path.Backend.ServiceName, backendID.Path.Backend.ServicePort.String(), backendID.Ingress.Name))
if backendID.Rule != nil && len(backendID.Rule.Host) != 0 {
probe.Host = to.StringPtr(backendID.Rule.Host)
}
pathPrefix, err := annotations.BackendPathPrefix(backendID.Ingress)
if err == nil {
probe.Path = to.StringPtr(pathPrefix)
} else if backendID.Path != nil && len(backendID.Path.Path) != 0 {
probe.Path = to.StringPtr(backendID.Path.Path)
}
k8sProbeForServiceContainer := builder.getProbeForServiceContainer(service, backendID)
if k8sProbeForServiceContainer != nil {
if len(k8sProbeForServiceContainer.Handler.HTTPGet.Host) != 0 {
probe.Host = to.StringPtr(k8sProbeForServiceContainer.Handler.HTTPGet.Host)
}
if len(k8sProbeForServiceContainer.Handler.HTTPGet.Path) != 0 {
probe.Path = to.StringPtr(k8sProbeForServiceContainer.Handler.HTTPGet.Path)
}
if k8sProbeForServiceContainer.Handler.HTTPGet.Scheme == v1.URISchemeHTTPS {
probe.Protocol = network.HTTPS
}
if k8sProbeForServiceContainer.PeriodSeconds != 0 {
probe.Interval = to.Int32Ptr(k8sProbeForServiceContainer.PeriodSeconds)
}
if k8sProbeForServiceContainer.TimeoutSeconds != 0 {
probe.Timeout = to.Int32Ptr(k8sProbeForServiceContainer.TimeoutSeconds)
}
if k8sProbeForServiceContainer.FailureThreshold != 0 {
probe.UnhealthyThreshold = to.Int32Ptr(k8sProbeForServiceContainer.FailureThreshold)
}
}
return &probe
}
func (builder *appGwConfigBuilder) getProbeForServiceContainer(service *v1.Service, backendID backendIdentifier) *v1.Probe {
allPorts := make(map[int32]interface{})
for _, sp := range service.Spec.Ports {
if sp.Protocol != v1.ProtocolTCP {
continue
}
if fmt.Sprint(sp.Port) == backendID.Backend.ServicePort.String() ||
sp.Name == backendID.Backend.ServicePort.String() ||
sp.TargetPort.String() == backendID.Backend.ServicePort.String() {
// Matched a service port in the service
if sp.TargetPort.String() == "" {
allPorts[sp.Port] = nil
} else if sp.TargetPort.Type == intstr.Int {
// port is defined as port number
allPorts[sp.TargetPort.IntVal] = nil
} else {
for targetPort := range builder.resolvePortName(sp.TargetPort.StrVal, &backendID) {
allPorts[targetPort] = nil
}
}
}
}
podList := builder.k8sContext.GetPodsByServiceSelector(service.Spec.Selector)
for _, pod := range podList {
for _, container := range pod.Spec.Containers {
for _, port := range container.Ports {
if _, ok := allPorts[port.ContainerPort]; !ok {
continue
}
var probe *v1.Probe
if container.ReadinessProbe != nil && container.ReadinessProbe.Handler.HTTPGet != nil {
probe = container.ReadinessProbe
} else if container.LivenessProbe != nil && container.LivenessProbe.Handler.HTTPGet != nil {
probe = container.LivenessProbe
}
return probe
}
}
}
return nil
}