Move code to pkg
This commit is contained in:
Ludovic Fernandez
Traefiker Bot
parent
bd4c822670
commit
f1b085fa36
465 changed files with 656 additions and 680 deletions
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@ -1,223 +0,0 @@
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package healthcheck
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import (
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"context"
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"fmt"
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"net"
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"net/http"
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"net/url"
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"strconv"
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"sync"
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"time"
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"github.com/containous/traefik/log"
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"github.com/containous/traefik/safe"
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"github.com/go-kit/kit/metrics"
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"github.com/vulcand/oxy/roundrobin"
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)
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var singleton *HealthCheck
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var once sync.Once
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// BalancerHandler includes functionality for load-balancing management.
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type BalancerHandler interface {
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ServeHTTP(w http.ResponseWriter, req *http.Request)
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Servers() []*url.URL
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RemoveServer(u *url.URL) error
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UpsertServer(u *url.URL, options ...roundrobin.ServerOption) error
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}
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// metricsRegistry is a local interface in the health check package, exposing only the required metrics
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// necessary for the health check package. This makes it easier for the tests.
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type metricsRegistry interface {
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BackendServerUpGauge() metrics.Gauge
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}
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// Options are the public health check options.
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type Options struct {
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Headers map[string]string
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Hostname string
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Scheme string
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Path string
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Port int
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Transport http.RoundTripper
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Interval time.Duration
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Timeout time.Duration
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LB BalancerHandler
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}
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func (opt Options) String() string {
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return fmt.Sprintf("[Hostname: %s Headers: %v Path: %s Port: %d Interval: %s Timeout: %s]", opt.Hostname, opt.Headers, opt.Path, opt.Port, opt.Interval, opt.Timeout)
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}
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// BackendConfig HealthCheck configuration for a backend
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type BackendConfig struct {
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Options
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name string
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disabledURLs []*url.URL
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}
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func (b *BackendConfig) newRequest(serverURL *url.URL) (*http.Request, error) {
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u, err := serverURL.Parse(b.Path)
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if err != nil {
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return nil, err
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}
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if len(b.Scheme) > 0 {
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u.Scheme = b.Scheme
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}
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if b.Port != 0 {
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u.Host = net.JoinHostPort(u.Hostname(), strconv.Itoa(b.Port))
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}
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return http.NewRequest(http.MethodGet, u.String(), http.NoBody)
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}
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// this function adds additional http headers and hostname to http.request
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func (b *BackendConfig) addHeadersAndHost(req *http.Request) *http.Request {
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if b.Options.Hostname != "" {
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req.Host = b.Options.Hostname
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}
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for k, v := range b.Options.Headers {
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req.Header.Set(k, v)
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}
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return req
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}
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// HealthCheck struct
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type HealthCheck struct {
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Backends map[string]*BackendConfig
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metrics metricsRegistry
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cancel context.CancelFunc
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}
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// SetBackendsConfiguration set backends configuration
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func (hc *HealthCheck) SetBackendsConfiguration(parentCtx context.Context, backends map[string]*BackendConfig) {
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hc.Backends = backends
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if hc.cancel != nil {
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hc.cancel()
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}
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ctx, cancel := context.WithCancel(parentCtx)
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hc.cancel = cancel
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for _, backend := range backends {
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currentBackend := backend
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safe.Go(func() {
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hc.execute(ctx, currentBackend)
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})
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}
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}
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func (hc *HealthCheck) execute(ctx context.Context, backend *BackendConfig) {
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log.Debugf("Initial health check for backend: %q", backend.name)
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hc.checkBackend(backend)
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ticker := time.NewTicker(backend.Interval)
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defer ticker.Stop()
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for {
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select {
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case <-ctx.Done():
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log.Debugf("Stopping current health check goroutines of backend: %s", backend.name)
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return
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case <-ticker.C:
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log.Debugf("Refreshing health check for backend: %s", backend.name)
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hc.checkBackend(backend)
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}
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}
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}
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func (hc *HealthCheck) checkBackend(backend *BackendConfig) {
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enabledURLs := backend.LB.Servers()
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var newDisabledURLs []*url.URL
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// FIXME re enable metrics
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for _, disableURL := range backend.disabledURLs {
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// FIXME serverUpMetricValue := float64(0)
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if err := checkHealth(disableURL, backend); err == nil {
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log.Warnf("Health check up: Returning to server list. Backend: %q URL: %q", backend.name, disableURL.String())
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if err = backend.LB.UpsertServer(disableURL, roundrobin.Weight(1)); err != nil {
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log.Error(err)
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}
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// FIXME serverUpMetricValue = 1
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} else {
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log.Warnf("Health check still failing. Backend: %q URL: %q Reason: %s", backend.name, disableURL.String(), err)
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newDisabledURLs = append(newDisabledURLs, disableURL)
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}
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// FIXME labelValues := []string{"backend", backend.name, "url", disableURL.String()}
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// FIXME hc.metrics.BackendServerUpGauge().With(labelValues...).Set(serverUpMetricValue)
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}
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backend.disabledURLs = newDisabledURLs
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// FIXME re enable metrics
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for _, enableURL := range enabledURLs {
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// FIXME serverUpMetricValue := float64(1)
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if err := checkHealth(enableURL, backend); err != nil {
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log.Warnf("Health check failed: Remove from server list. Backend: %q URL: %q Reason: %s", backend.name, enableURL.String(), err)
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if err := backend.LB.RemoveServer(enableURL); err != nil {
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log.Error(err)
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}
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backend.disabledURLs = append(backend.disabledURLs, enableURL)
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// FIXME serverUpMetricValue = 0
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}
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// FIXME labelValues := []string{"backend", backend.name, "url", enableURL.String()}
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// FIXME hc.metrics.BackendServerUpGauge().With(labelValues...).Set(serverUpMetricValue)
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}
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}
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// FIXME re add metrics
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//func GetHealthCheck(metrics metricsRegistry) *HealthCheck {
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// GetHealthCheck returns the health check which is guaranteed to be a singleton.
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func GetHealthCheck() *HealthCheck {
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once.Do(func() {
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singleton = newHealthCheck()
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//singleton = newHealthCheck(metrics)
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})
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return singleton
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}
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// FIXME re add metrics
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//func newHealthCheck(metrics metricsRegistry) *HealthCheck {
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func newHealthCheck() *HealthCheck {
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return &HealthCheck{
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Backends: make(map[string]*BackendConfig),
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//metrics: metrics,
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}
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}
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// NewBackendConfig Instantiate a new BackendConfig
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func NewBackendConfig(options Options, backendName string) *BackendConfig {
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return &BackendConfig{
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Options: options,
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name: backendName,
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}
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}
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// checkHealth returns a nil error in case it was successful and otherwise
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// a non-nil error with a meaningful description why the health check failed.
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func checkHealth(serverURL *url.URL, backend *BackendConfig) error {
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req, err := backend.newRequest(serverURL)
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if err != nil {
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return fmt.Errorf("failed to create HTTP request: %s", err)
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}
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req = backend.addHeadersAndHost(req)
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client := http.Client{
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Timeout: backend.Options.Timeout,
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Transport: backend.Options.Transport,
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}
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resp, err := client.Do(req)
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if err != nil {
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return fmt.Errorf("HTTP request failed: %s", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusBadRequest {
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return fmt.Errorf("received error status code: %v", resp.StatusCode)
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}
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return nil
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}
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