forked from projectcontour/contour
/
healthcheck.go
72 lines (64 loc) · 2.09 KB
/
healthcheck.go
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// Copyright © 2018 Heptio
// 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"
"github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
"github.com/gogo/protobuf/types"
"github.com/heptio/contour/internal/dag"
)
const (
// Default healthcheck / lb algorithm values
hcTimeout = 2 * time.Second
hcInterval = 10 * time.Second
hcUnhealthyThreshold = 3
hcHealthyThreshold = 2
hcHost = "contour-envoy-healthcheck"
)
// healthCheck returns a *core.HealthCheck value.
func healthCheck(service *dag.TCPService) *core.HealthCheck {
hc := service.HealthCheck
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 &core.HealthCheck{
Timeout: secondsOrDefault(hc.TimeoutSeconds, hcTimeout),
Interval: secondsOrDefault(hc.IntervalSeconds, hcInterval),
UnhealthyThreshold: countOrDefault(hc.UnhealthyThresholdCount, hcUnhealthyThreshold),
HealthyThreshold: countOrDefault(hc.HealthyThresholdCount, hcHealthyThreshold),
HealthChecker: &core.HealthCheck_HttpHealthCheck_{
HttpHealthCheck: &core.HealthCheck_HttpHealthCheck{
Path: hc.Path,
Host: host,
},
},
}
}
func secondsOrDefault(seconds int64, def time.Duration) *time.Duration {
if seconds != 0 {
t := time.Duration(seconds) * time.Second
return &t
}
return &def
}
func countOrDefault(count uint32, def int) *types.UInt32Value {
switch count {
case 0:
return u32(def)
default:
return u32(int(count))
}
}