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healthcheck.go
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healthcheck.go
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// Copyright Project Contour 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.
package envoy
import (
"time"
envoy_api_v2_core "github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
"github.com/golang/protobuf/ptypes/duration"
"github.com/golang/protobuf/ptypes/wrappers"
"github.com/projectcontour/contour/internal/dag"
"github.com/projectcontour/contour/internal/protobuf"
)
const (
// Default healthcheck / lb algorithm values
hcTimeout = 2 * time.Second
hcInterval = 10 * time.Second
hcUnhealthyThreshold = 3
hcHealthyThreshold = 2
hcHost = "contour-envoy-healthcheck"
)
// httpHealthCheck returns a *envoy_api_v2_core.HealthCheck value for HTTP Routes
func httpHealthCheck(cluster *dag.Cluster) *envoy_api_v2_core.HealthCheck {
hc := cluster.HTTPHealthCheckPolicy
host := hcHost
if hc.Host != "" {
host = hc.Host
}
// TODO(dfc) why do we need to specify our own default, what is the default
// that envoy applies if these fields are left nil?
return &envoy_api_v2_core.HealthCheck{
Timeout: durationOrDefault(hc.Timeout, hcTimeout),
Interval: durationOrDefault(hc.Interval, hcInterval),
UnhealthyThreshold: countOrDefault(hc.UnhealthyThreshold, hcUnhealthyThreshold),
HealthyThreshold: countOrDefault(hc.HealthyThreshold, hcHealthyThreshold),
HealthChecker: &envoy_api_v2_core.HealthCheck_HttpHealthCheck_{
HttpHealthCheck: &envoy_api_v2_core.HealthCheck_HttpHealthCheck{
Path: hc.Path,
Host: host,
},
},
}
}
// tcpHealthCheck returns a *envoy_api_v2_core.HealthCheck value for TCPProxies
func tcpHealthCheck(cluster *dag.Cluster) *envoy_api_v2_core.HealthCheck {
hc := cluster.TCPHealthCheckPolicy
return &envoy_api_v2_core.HealthCheck{
Timeout: durationOrDefault(hc.Timeout, hcTimeout),
Interval: durationOrDefault(hc.Interval, hcInterval),
UnhealthyThreshold: countOrDefault(hc.UnhealthyThreshold, hcUnhealthyThreshold),
HealthyThreshold: countOrDefault(hc.HealthyThreshold, hcHealthyThreshold),
HealthChecker: &envoy_api_v2_core.HealthCheck_TcpHealthCheck_{
TcpHealthCheck: &envoy_api_v2_core.HealthCheck_TcpHealthCheck{},
},
}
}
func durationOrDefault(d, def time.Duration) *duration.Duration {
if d != 0 {
return protobuf.Duration(d)
}
return protobuf.Duration(def)
}
func countOrDefault(count uint32, def uint32) *wrappers.UInt32Value {
switch count {
case 0:
return protobuf.UInt32(def)
default:
return protobuf.UInt32(count)
}
}