func pingHost(
dialer transport.Dialer,
host string,
timeout time.Duration,
validator ConnCheck,
) (common.MapStr, reason.Reason) {
start := time.Now()
deadline := start.Add(timeout)
conn, err := dialer.Dial("tcp", host)
if err != nil {
debugf("dial failed with: %v", err)
return nil, reason.IOFailed(err)
}
defer conn.Close()
if validator == nil {
// no additional validation step => ping success
return common.MapStr{}, nil
}
if err := conn.SetDeadline(deadline); err != nil {
debugf("setting connection deadline failed with: %v", err)
return nil, reason.IOFailed(err)
}
validateStart := time.Now()
err = validator.Validate(conn)
if err != nil && err != errRecvMismatch {
debugf("check failed with: %v", err)
return nil, reason.IOFailed(err)
}
end := time.Now()
event := common.MapStr{
"validate_rtt": look.RTT(end.Sub(validateStart)),
}
if err != nil {
event["error"] = reason.FailValidate(err)
}
return event, nil
}
func execPing(
client *http.Client,
req *http.Request,
body []byte,
timeout time.Duration,
validator func(*http.Response) error,
) (common.MapStr, reason.Reason) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
req = req.WithContext(ctx)
if len(body) > 0 {
req.Body = ioutil.NopCloser(bytes.NewBuffer(body))
req.ContentLength = int64(len(body))
}
start := time.Now()
resp, err := client.Do(req)
end := time.Now()
if err != nil {
return nil, reason.IOFailed(err)
}
defer resp.Body.Close()
if err := validator(resp); err != nil {
return nil, reason.ValidateFailed(err)
}
rtt := end.Sub(start)
event := common.MapStr{
"response": common.MapStr{
"status": resp.StatusCode,
},
"rtt": look.RTT(rtt),
}
return event, nil
}