mirror of
https://github.com/ceph/ceph-csi.git
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108 lines
2.4 KiB
Go
108 lines
2.4 KiB
Go
/*
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Copyright 2023 ceph-csi authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package healthchecker
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import (
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"fmt"
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"sync"
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"time"
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)
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// command is what is sent through the channel to terminate the go routine.
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type command string
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const (
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// stopCommand is sent through the channel to stop checking.
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stopCommand = command("STOP")
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)
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type checker struct {
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// interval contains the time to sleep between health checks.
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interval time.Duration
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// timeout contains the delay (interval + timeout)
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timeout time.Duration
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// mutex protects against concurrent access to healty, err and
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// lastUpdate
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mutex *sync.RWMutex
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// current status
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isRunning bool
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healthy bool
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err error
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lastUpdate time.Time
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// commands is the channel to read commands from; when to stop.
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commands chan command
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runChecker func()
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}
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func (c *checker) initDefaults() {
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c.interval = 60 * time.Second
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c.timeout = 15 * time.Second
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c.mutex = &sync.RWMutex{}
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c.isRunning = false
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c.err = nil
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c.healthy = true
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c.lastUpdate = time.Now()
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c.commands = make(chan command)
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c.runChecker = func() {
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panic("BUG: implement runChecker() in the final checker struct")
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}
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}
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func (c *checker) start() {
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if c.isRunning {
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return
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}
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go c.runChecker()
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}
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func (c *checker) stop() {
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c.commands <- stopCommand
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}
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func (c *checker) isHealthy() (bool, error) {
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// check for the last update, it should be within
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//
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// c.lastUpdate < (c.interval + c.timeout)
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//
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// Without such a check, a single slow write/read could trigger actions
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// to recover an unhealthy volume already.
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//
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// It is required to check, in case the write or read in the go routine
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// is blocked.
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delay := time.Since(c.lastUpdate)
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if delay > (c.interval + c.timeout) {
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c.mutex.Lock()
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c.healthy = false
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c.err = fmt.Errorf("health-check has not responded for %f seconds", delay.Seconds())
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c.mutex.Unlock()
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}
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// read lock to get consistency between the return values
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c.mutex.RLock()
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defer c.mutex.RUnlock()
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return c.healthy, c.err
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}
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