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healthchecker.go
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/
healthchecker.go
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package worker
import (
"context"
"net/http"
"time"
"code.cloudfoundry.org/lager/v3"
)
type healthChecker struct {
baggageclaimAddr string
gardenAddr string
timeout time.Duration
logger lager.Logger
}
func NewHealthChecker(logger lager.Logger, baggageclaimAddr, gardenAddr string, checkTimeout time.Duration) healthChecker {
return healthChecker{
logger: logger,
baggageclaimAddr: baggageclaimAddr,
gardenAddr: gardenAddr,
timeout: checkTimeout,
}
}
func doRequest(ctx context.Context, url string) error {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return err
}
req = req.WithContext(ctx)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
_ = resp.Body.Close()
return nil
}
func (h *healthChecker) CheckHealth(w http.ResponseWriter, req *http.Request) {
var err error
ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(h.timeout))
defer cancel()
err = doRequest(ctx, h.gardenAddr+"/ping")
if err != nil {
w.WriteHeader(503)
h.logger.Error("failed-to-ping-garden-server", err)
return
}
err = doRequest(ctx, h.baggageclaimAddr+"/volumes")
if err != nil {
w.WriteHeader(503)
h.logger.Error("failed-to-list-volumes-on-baggageclaim-server", err)
return
}
}