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policy.go
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policy.go
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// Copyright 2017 Istio 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.
// Functions related to translation from the control policies to Envoy config
// Policies apply to Envoy upstream clusters but may appear in the route section.
package v1
import (
meshconfig "istio.io/api/mesh/v1alpha1"
networking "istio.io/api/networking/v1alpha3"
routing "istio.io/api/routing/v1alpha1"
"istio.io/istio/pilot/pkg/model"
"istio.io/istio/pkg/log"
)
func isDestinationExcludedForMTLS(serviceName string, mtlsExcludedServices []string) bool {
hostname, _, _ := model.ParseServiceKey(serviceName)
for _, serviceName := range mtlsExcludedServices {
if hostname == serviceName {
return true
}
}
return false
}
// ApplyClusterPolicy assumes an outbound cluster and inserts custom configuration for the cluster
func ApplyClusterPolicy(cluster *Cluster,
proxyInstances []*model.ServiceInstance,
config model.IstioConfigStore,
mesh *meshconfig.MeshConfig,
accounts model.ServiceAccounts,
domain string) {
duration := protoDurationToMS(mesh.ConnectTimeout)
cluster.ConnectTimeoutMs = duration
// skip remaining policies for non mesh-local outbound clusters
if !cluster.outbound {
return
}
// Original DST cluster are used to route to services outside the mesh
// where Istio auth does not apply.
if cluster.Type != ClusterTypeOriginalDST {
if !isDestinationExcludedForMTLS(cluster.ServiceName, mesh.MtlsExcludedServices) &&
consolidateAuthPolicy(mesh, cluster.Port.AuthenticationPolicy) == meshconfig.AuthenticationPolicy_MUTUAL_TLS {
// apply auth policies
ports := model.PortList{cluster.Port}.GetNames()
serviceAccounts := accounts.GetIstioServiceAccounts(cluster.Hostname, ports)
cluster.SSLContext = buildClusterSSLContext(model.AuthCertsPath, serviceAccounts)
}
}
// apply destination policies
policyConfig := config.Policy(proxyInstances, cluster.Hostname, cluster.labels)
// if no policy is configured apply destination rule if one exists
if policyConfig == nil {
applyDestinationRule(config, cluster, domain)
return
}
policy := policyConfig.Spec.(*routing.DestinationPolicy)
// Load balancing policies do not apply for Original DST clusters
// as the intent is to go directly to the instance.
if policy.LoadBalancing != nil && cluster.Type != ClusterTypeOriginalDST {
switch policy.LoadBalancing.GetName() {
case routing.LoadBalancing_ROUND_ROBIN:
cluster.LbType = LbTypeRoundRobin
case routing.LoadBalancing_LEAST_CONN:
cluster.LbType = LbTypeLeastRequest
case routing.LoadBalancing_RANDOM:
cluster.LbType = LbTypeRandom
}
}
// Set up circuit breakers and outlier detection
if policy.CircuitBreaker != nil && policy.CircuitBreaker.GetSimpleCb() != nil {
cbconfig := policy.CircuitBreaker.GetSimpleCb()
cluster.MaxRequestsPerConnection = int(cbconfig.HttpMaxRequestsPerConnection)
// Envoy's circuit breaker is a combination of its circuit breaker (which is actually a bulk head)
// outlier detection (which is per pod circuit breaker)
cluster.CircuitBreaker = &CircuitBreaker{}
if cbconfig.MaxConnections > 0 {
cluster.CircuitBreaker.Default.MaxConnections = int(cbconfig.MaxConnections)
}
if cbconfig.HttpMaxRequests > 0 {
cluster.CircuitBreaker.Default.MaxRequests = int(cbconfig.HttpMaxRequests)
}
if cbconfig.HttpMaxPendingRequests > 0 {
cluster.CircuitBreaker.Default.MaxPendingRequests = int(cbconfig.HttpMaxPendingRequests)
}
if cbconfig.HttpMaxRetries > 0 {
cluster.CircuitBreaker.Default.MaxRetries = int(cbconfig.HttpMaxRetries)
}
cluster.OutlierDetection = &OutlierDetection{}
cluster.OutlierDetection.MaxEjectionPercent = 10
if cbconfig.SleepWindow.Seconds > 0 {
cluster.OutlierDetection.BaseEjectionTimeMS = protoDurationToMS(cbconfig.SleepWindow)
}
if cbconfig.HttpConsecutiveErrors > 0 {
cluster.OutlierDetection.ConsecutiveErrors = int(cbconfig.HttpConsecutiveErrors)
}
if cbconfig.HttpDetectionInterval.Seconds > 0 {
cluster.OutlierDetection.IntervalMS = protoDurationToMS(cbconfig.HttpDetectionInterval)
}
if cbconfig.HttpMaxEjectionPercent > 0 {
cluster.OutlierDetection.MaxEjectionPercent = int(cbconfig.HttpMaxEjectionPercent)
}
}
}
func applyLoadBalancePolicy(cluster *Cluster, policy *networking.LoadBalancerSettings) {
if policy == nil || cluster.Type == ClusterTypeOriginalDST {
return
}
if consistent := policy.GetConsistentHash(); consistent != nil {
// cluster.LbType = LbTypeRingHash
// TODO: need to set special values in the route config
// see: https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/load_balancing.html#ring-hash
log.Warn("Consistent hash load balancing type is not currently supported")
} else {
switch policy.GetSimple() {
case networking.LoadBalancerSettings_LEAST_CONN:
cluster.LbType = LbTypeLeastRequest
case networking.LoadBalancerSettings_RANDOM:
cluster.LbType = LbTypeRandom
case networking.LoadBalancerSettings_PASSTHROUGH:
cluster.LbType = LbTypeOriginalDST // FIXME: double-check
default:
cluster.LbType = LbTypeRoundRobin
}
}
}
func buildOutlierDetection(outlier *networking.OutlierDetection) *OutlierDetection {
if outlier != nil && outlier.Http != nil {
out := &OutlierDetection{
ConsecutiveErrors: 5,
IntervalMS: 10000, // 10s
BaseEjectionTimeMS: 30000, // 30s
MaxEjectionPercent: 10,
}
if outlier.Http.BaseEjectionTime != nil {
out.BaseEjectionTimeMS = protoDurationToMS(outlier.Http.BaseEjectionTime)
}
if outlier.Http.ConsecutiveErrors > 0 {
out.ConsecutiveErrors = int(outlier.Http.ConsecutiveErrors)
}
if outlier.Http.Interval != nil {
out.IntervalMS = protoDurationToMS(outlier.Http.Interval)
}
if outlier.Http.MaxEjectionPercent > 0 {
out.MaxEjectionPercent = int(outlier.Http.MaxEjectionPercent)
}
return out
}
return nil
}
func applyConnectionPool(cluster *Cluster, settings *networking.ConnectionPoolSettings) {
cluster.MaxRequestsPerConnection = 1024 // TODO: set during cluster construction?
if settings == nil {
return
}
// Envoy's circuit breaker is a combination of its circuit breaker (which is actually a bulk head) and
// outlier detection (which is per pod circuit breaker)
cluster.CircuitBreaker = &CircuitBreaker{
Default: DefaultCBPriority{
MaxConnections: 1024, // TODO: what is the Istio default?
MaxPendingRequests: 1024,
MaxRequests: 1024,
MaxRetries: 3,
},
}
if settings.Http != nil {
if settings.Http.Http2MaxRequests > 0 {
// Envoy only applies MaxRequests in HTTP/2 clusters
cluster.CircuitBreaker.Default.MaxRequests = int(settings.Http.Http2MaxRequests)
}
if settings.Http.Http1MaxPendingRequests > 0 {
// Envoy only applies MaxPendingRequests in HTTP/1.1 clusters
cluster.CircuitBreaker.Default.MaxPendingRequests = int(settings.Http.Http1MaxPendingRequests)
}
if settings.Http.MaxRequestsPerConnection > 0 {
cluster.MaxRequestsPerConnection = int(settings.Http.MaxRequestsPerConnection)
}
// FIXME: zero is a valid value if explicitly set, otherwise we want to use the default value of 3
if settings.Http.MaxRetries > 0 {
cluster.CircuitBreaker.Default.MaxRetries = int(settings.Http.MaxRetries)
}
}
if settings.Tcp != nil {
if settings.Tcp.ConnectTimeout != nil {
cluster.ConnectTimeoutMs = protoDurationToMS(settings.Tcp.ConnectTimeout)
}
if settings.Tcp.MaxConnections > 0 {
cluster.CircuitBreaker.Default.MaxConnections = int(settings.Tcp.MaxConnections)
}
}
}
// TODO: write unit tests for sub-functions
func applyTrafficPolicy(cluster *Cluster, policy *networking.TrafficPolicy) {
if policy == nil {
return
}
applyLoadBalancePolicy(cluster, policy.LoadBalancer)
applyConnectionPool(cluster, policy.ConnectionPool)
cluster.OutlierDetection = buildOutlierDetection(policy.OutlierDetection)
}
func applyDestinationRule(config model.IstioConfigStore, cluster *Cluster, domain string) {
destinationRuleConfig := config.DestinationRule(cluster.Hostname, domain)
if destinationRuleConfig != nil {
destinationRule := destinationRuleConfig.Spec.(*networking.DestinationRule)
applyTrafficPolicy(cluster, destinationRule.TrafficPolicy)
for _, subset := range destinationRule.Subsets {
if cluster.labels.Equals(subset.Labels) {
applyTrafficPolicy(cluster, subset.TrafficPolicy)
break
}
}
}
}