25345427c3
The new parameter allows to set a health check interval valid for all backends. Custom values set per provider may override the global one.
139 lines
3.6 KiB
Go
139 lines
3.6 KiB
Go
package healthcheck
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"net/http"
|
|
"net/url"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/containous/traefik/log"
|
|
"github.com/containous/traefik/safe"
|
|
"github.com/vulcand/oxy/roundrobin"
|
|
)
|
|
|
|
var singleton *HealthCheck
|
|
var once sync.Once
|
|
|
|
// GetHealthCheck returns the health check which is guaranteed to be a singleton.
|
|
func GetHealthCheck() *HealthCheck {
|
|
once.Do(func() {
|
|
singleton = newHealthCheck()
|
|
})
|
|
return singleton
|
|
}
|
|
|
|
// Options are the public health check options.
|
|
type Options struct {
|
|
Path string
|
|
Interval time.Duration
|
|
LB LoadBalancer
|
|
}
|
|
|
|
func (opt Options) String() string {
|
|
return fmt.Sprintf("[Path: %s Interval: %s]", opt.Path, opt.Interval)
|
|
}
|
|
|
|
// BackendHealthCheck HealthCheck configuration for a backend
|
|
type BackendHealthCheck struct {
|
|
Options
|
|
disabledURLs []*url.URL
|
|
requestTimeout time.Duration
|
|
}
|
|
|
|
//HealthCheck struct
|
|
type HealthCheck struct {
|
|
Backends map[string]*BackendHealthCheck
|
|
cancel context.CancelFunc
|
|
}
|
|
|
|
// LoadBalancer includes functionality for load-balancing management.
|
|
type LoadBalancer interface {
|
|
RemoveServer(u *url.URL) error
|
|
UpsertServer(u *url.URL, options ...roundrobin.ServerOption) error
|
|
Servers() []*url.URL
|
|
}
|
|
|
|
func newHealthCheck() *HealthCheck {
|
|
return &HealthCheck{
|
|
Backends: make(map[string]*BackendHealthCheck),
|
|
}
|
|
}
|
|
|
|
// NewBackendHealthCheck Instantiate a new BackendHealthCheck
|
|
func NewBackendHealthCheck(options Options) *BackendHealthCheck {
|
|
return &BackendHealthCheck{
|
|
Options: options,
|
|
requestTimeout: 5 * time.Second,
|
|
}
|
|
}
|
|
|
|
//SetBackendsConfiguration set backends configuration
|
|
func (hc *HealthCheck) SetBackendsConfiguration(parentCtx context.Context, backends map[string]*BackendHealthCheck) {
|
|
hc.Backends = backends
|
|
if hc.cancel != nil {
|
|
hc.cancel()
|
|
}
|
|
ctx, cancel := context.WithCancel(parentCtx)
|
|
hc.cancel = cancel
|
|
|
|
for backendID, backend := range hc.Backends {
|
|
currentBackendID := backendID
|
|
currentBackend := backend
|
|
safe.Go(func() {
|
|
hc.execute(ctx, currentBackendID, currentBackend)
|
|
})
|
|
}
|
|
}
|
|
|
|
func (hc *HealthCheck) execute(ctx context.Context, backendID string, backend *BackendHealthCheck) {
|
|
log.Debugf("Initial healthcheck for currentBackend %s ", backendID)
|
|
checkBackend(backend)
|
|
ticker := time.NewTicker(backend.Interval)
|
|
defer ticker.Stop()
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
log.Debugf("Stopping all current Healthcheck goroutines")
|
|
return
|
|
case <-ticker.C:
|
|
log.Debugf("Refreshing healthcheck for currentBackend %s ", backendID)
|
|
checkBackend(backend)
|
|
}
|
|
}
|
|
}
|
|
|
|
func checkBackend(currentBackend *BackendHealthCheck) {
|
|
enabledURLs := currentBackend.LB.Servers()
|
|
var newDisabledURLs []*url.URL
|
|
for _, url := range currentBackend.disabledURLs {
|
|
if checkHealth(url, currentBackend) {
|
|
log.Debugf("HealthCheck is up [%s]: Upsert in server list", url.String())
|
|
currentBackend.LB.UpsertServer(url, roundrobin.Weight(1))
|
|
} else {
|
|
log.Warnf("HealthCheck is still failing [%s]", url.String())
|
|
newDisabledURLs = append(newDisabledURLs, url)
|
|
}
|
|
}
|
|
currentBackend.disabledURLs = newDisabledURLs
|
|
|
|
for _, url := range enabledURLs {
|
|
if !checkHealth(url, currentBackend) {
|
|
log.Warnf("HealthCheck has failed [%s]: Remove from server list", url.String())
|
|
currentBackend.LB.RemoveServer(url)
|
|
currentBackend.disabledURLs = append(currentBackend.disabledURLs, url)
|
|
}
|
|
}
|
|
}
|
|
|
|
func checkHealth(serverURL *url.URL, backend *BackendHealthCheck) bool {
|
|
client := http.Client{
|
|
Timeout: backend.requestTimeout,
|
|
}
|
|
resp, err := client.Get(serverURL.String() + backend.Path)
|
|
if err == nil {
|
|
defer resp.Body.Close()
|
|
}
|
|
return err == nil && resp.StatusCode == 200
|
|
}
|