func annotated(start time.Time, typ string, fn func() (common.MapStr, []TaskRunner, error)) TaskRunner {
return MakeCont(func() (common.MapStr, []TaskRunner, error) {
event, cont, err := fn()
if err != nil {
if event == nil {
event = common.MapStr{}
}
event["error"] = look.Reason(err)
}
if event != nil {
event.Update(common.MapStr{
"@timestamp": look.Timestamp(start),
"duration": look.RTT(time.Now().Sub(start)),
"type": typ,
"up": err == nil,
})
}
for i := range cont {
if fcont, ok := cont[i].(funcTask); ok {
cont[i] = fcont.annotated(start, typ)
} else {
cont[i] = annotated(start, typ, cont[i].Run)
}
}
return event, cont, nil
})
}
func createPingFactory(
config *Config,
hostname string,
port uint16,
tls *transport.TLSConfig,
request *http.Request,
body []byte,
validator RespCheck,
) func(*net.IPAddr) monitors.TaskRunner {
fields := common.MapStr{
"scheme": request.URL.Scheme,
"port": port,
"url": request.URL.String(),
}
timeout := config.Timeout
isTLS := request.URL.Scheme == "https"
checkRedirect := makeCheckRedirect(config.MaxRedirects)
return monitors.MakePingIPFactory(fields, func(ip *net.IPAddr) (common.MapStr, error) {
addr := net.JoinHostPort(ip.String(), strconv.Itoa(int(port)))
d := &dialchain.DialerChain{
Net: dialchain.ConstAddrDialer("tcp_connect_rtt", addr, timeout),
}
if isTLS {
d.AddLayer(dialchain.TLSLayer("tls_handshake_rtt", tls, timeout))
}
measures := common.MapStr{}
dialer, err := d.BuildWithMeasures(measures)
if err != nil {
return nil, err
}
var httpStart, httpEnd time.Time
client := &http.Client{
CheckRedirect: checkRedirect,
Timeout: timeout,
Transport: &SimpleTransport{
Dialer: dialer,
OnStartWrite: func() { httpStart = time.Now() },
OnStartRead: func() { httpEnd = time.Now() },
},
}
event, err := execPing(client, request, body, timeout, validator)
if event == nil {
event = measures
} else {
event.Update(measures)
}
if !httpEnd.IsZero() {
event["http_rtt"] = look.RTT(httpEnd.Sub(httpStart))
}
return event, err
})
}
func createPingIPFactory(config *Config) func(*net.IPAddr) (common.MapStr, error) {
return func(ip *net.IPAddr) (common.MapStr, error) {
rtt, _, err := loop.ping(ip, config.Timeout, config.Wait)
if err != nil {
return nil, err
}
return common.MapStr{
"icmp_rtt": look.RTT(rtt),
}, nil
}
}
func withStart(field string, start time.Time, r TaskRunner) TaskRunner {
return MakeCont(func() (common.MapStr, []TaskRunner, error) {
event, cont, err := r.Run()
if event != nil {
event[field] = look.RTT(time.Now().Sub(start))
}
for i := range cont {
cont[i] = withStart(field, start, cont[i])
}
return event, cont, err
})
}
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
}
func MakeByHostJob(
name, typ string,
host string,
settings IPSettings,
pingFactory func(ip *net.IPAddr) TaskRunner,
) (Job, error) {
network := settings.Network()
if network == "" {
return nil, errors.New("pinging hosts requires ipv4 or ipv6 mode enabled")
}
mode := settings.Mode
if mode == PingAny {
return MakeJob(name, typ, func() (common.MapStr, []TaskRunner, error) {
event := common.MapStr{"host": host}
dnsStart := time.Now()
ip, err := net.ResolveIPAddr(network, host)
if err != nil {
return event, nil, err
}
dnsEnd := time.Now()
dnsRTT := dnsEnd.Sub(dnsStart)
event["resolve_rtt"] = look.RTT(dnsRTT)
event["ip"] = ip.String()
return WithFields(event, pingFactory(ip)).Run()
}), nil
}
filter := makeIPFilter(network)
return MakeJob(name, typ, func() (common.MapStr, []TaskRunner, error) {
event := common.MapStr{"host": host}
// TODO: check for better DNS IP lookup support:
// - The net.LookupIP drops ipv6 zone index
//
dnsStart := time.Now()
ips, err := net.LookupIP(host)
if err != nil {
return event, nil, err
}
dnsEnd := time.Now()
dnsRTT := dnsEnd.Sub(dnsStart)
event["resolve_rtt"] = look.RTT(dnsRTT)
if filter != nil {
ips = filterIPs(ips, filter)
}
if len(ips) == 0 {
err := fmt.Errorf("no %v address resolvable for host %v", network, host)
return event, nil, err
}
// create ip ping tasks
cont := make([]TaskRunner, len(ips))
for i, ip := range ips {
addr := &net.IPAddr{IP: ip}
fields := event.Clone()
fields["ip"] = ip.String()
cont[i] = WithFields(fields, pingFactory(addr))
}
return nil, cont, nil
}), nil
}
func measureEventRTT(event common.MapStr, name string) DialLayerCallback {
return &MeasureLayerRTTCB{Callback: func(start, end time.Time) {
event[name] = look.RTT(end.Sub(start))
}}
}
