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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 envoy
import (
proxyconfig "istio.io/api/proxy/v1/config"
"istio.io/core/model"
"istio.io/core/proxy"
)
// applyClusterPolicy assumes an outbound cluster and inserts custom configuration for the cluster
func applyClusterPolicy(cluster *Cluster,
instances []*model.ServiceInstance,
config model.IstioConfigStore,
mesh *proxyconfig.MeshConfig,
accounts model.ServiceAccounts) {
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 {
// apply auth policies
switch mesh.AuthPolicy {
case proxyconfig.MeshConfig_NONE:
// do nothing
case proxyconfig.MeshConfig_MUTUAL_TLS:
// apply SSL context to enable mutual TLS between Envoy proxies for outbound clusters
ports := model.PortList{cluster.port}.GetNames()
serviceAccounts := accounts.GetIstioServiceAccounts(cluster.hostname, ports)
cluster.SSLContext = buildClusterSSLContext(proxy.AuthCertsPath, serviceAccounts)
}
}
// apply destination policies
policyConfig := config.Policy(instances, cluster.hostname, cluster.tags)
if policyConfig == nil {
return
}
policy := policyConfig.Spec.(*proxyconfig.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 proxyconfig.LoadBalancing_ROUND_ROBIN:
cluster.LbType = LbTypeRoundRobin
case proxyconfig.LoadBalancing_LEAST_CONN:
cluster.LbType = LbTypeLeastRequest
case proxyconfig.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)
}
//TODO: need to add max_retries as well. Currently it defaults to 3
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)
}
}
}