Standard deviation (jitter) for Input plugin Ping (#2078)
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@ -84,7 +84,7 @@ func (p *Ping) Gather(acc telegraf.Accumulator) error {
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strings.TrimSpace(out) + ", " + err.Error())
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}
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tags := map[string]string{"url": u}
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trans, rec, avg, err := processPingOutput(out)
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trans, rec, avg, stddev, err := processPingOutput(out)
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if err != nil {
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// fatal error
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errorChannel <- err
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@ -100,6 +100,9 @@ func (p *Ping) Gather(acc telegraf.Accumulator) error {
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if avg > 0 {
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fields["average_response_ms"] = avg
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}
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if stddev > 0 {
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fields["standard_deviation_ms"] = stddev
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}
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acc.AddFields("ping", fields, tags)
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}(url)
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}
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@ -166,9 +169,9 @@ func (p *Ping) args(url string) []string {
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// round-trip min/avg/max/stddev = 34.843/43.508/52.172/8.664 ms
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//
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// It returns (<transmitted packets>, <received packets>, <average response>)
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func processPingOutput(out string) (int, int, float64, error) {
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func processPingOutput(out string) (int, int, float64, float64, error) {
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var trans, recv int
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var avg float64
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var avg, stddev float64
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// Set this error to nil if we find a 'transmitted' line
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err := errors.New("Fatal error processing ping output")
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lines := strings.Split(out, "\n")
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@ -180,22 +183,23 @@ func processPingOutput(out string) (int, int, float64, error) {
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// Transmitted packets
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trans, err = strconv.Atoi(strings.Split(stats[0], " ")[0])
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if err != nil {
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return trans, recv, avg, err
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return trans, recv, avg, stddev, err
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}
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// Received packets
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recv, err = strconv.Atoi(strings.Split(stats[1], " ")[0])
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if err != nil {
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return trans, recv, avg, err
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return trans, recv, avg, stddev, err
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}
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} else if strings.Contains(line, "min/avg/max") {
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stats := strings.Split(line, " = ")[1]
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stats := strings.Split(line, " ")[3]
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avg, err = strconv.ParseFloat(strings.Split(stats, "/")[1], 64)
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stddev, err = strconv.ParseFloat(strings.Split(stats, "/")[3], 64)
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if err != nil {
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return trans, recv, avg, err
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return trans, recv, avg, stddev, err
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}
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}
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}
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return trans, recv, avg, err
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return trans, recv, avg, stddev, err
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}
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func init() {
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@ -48,23 +48,25 @@ ping: -i interval too short: Operation not permitted
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// Test that ping command output is processed properly
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func TestProcessPingOutput(t *testing.T) {
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trans, rec, avg, err := processPingOutput(bsdPingOutput)
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trans, rec, avg, stddev, err := processPingOutput(bsdPingOutput)
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assert.NoError(t, err)
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assert.Equal(t, 5, trans, "5 packets were transmitted")
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assert.Equal(t, 5, rec, "5 packets were transmitted")
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assert.InDelta(t, 20.224, avg, 0.001)
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assert.InDelta(t, 4.076, stddev, 0.001)
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trans, rec, avg, err = processPingOutput(linuxPingOutput)
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trans, rec, avg, stddev, err = processPingOutput(linuxPingOutput)
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assert.NoError(t, err)
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assert.Equal(t, 5, trans, "5 packets were transmitted")
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assert.Equal(t, 5, rec, "5 packets were transmitted")
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assert.InDelta(t, 43.628, avg, 0.001)
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assert.InDelta(t, 5.325, stddev, 0.001)
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}
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// Test that processPingOutput returns an error when 'ping' fails to run, such
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// as when an invalid argument is provided
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func TestErrorProcessPingOutput(t *testing.T) {
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_, _, _, err := processPingOutput(fatalPingOutput)
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_, _, _, _, err := processPingOutput(fatalPingOutput)
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assert.Error(t, err, "Error was expected from processPingOutput")
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}
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@ -145,10 +147,11 @@ func TestPingGather(t *testing.T) {
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p.Gather(&acc)
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tags := map[string]string{"url": "www.google.com"}
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fields := map[string]interface{}{
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"packets_transmitted": 5,
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"packets_received": 5,
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"percent_packet_loss": 0.0,
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"average_response_ms": 43.628,
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"packets_transmitted": 5,
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"packets_received": 5,
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"percent_packet_loss": 0.0,
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"average_response_ms": 43.628,
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"standard_deviation_ms": 5.325,
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}
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acc.AssertContainsTaggedFields(t, "ping", fields, tags)
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@ -182,10 +185,11 @@ func TestLossyPingGather(t *testing.T) {
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p.Gather(&acc)
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tags := map[string]string{"url": "www.google.com"}
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fields := map[string]interface{}{
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"packets_transmitted": 5,
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"packets_received": 3,
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"percent_packet_loss": 40.0,
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"average_response_ms": 44.033,
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"packets_transmitted": 5,
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"packets_received": 3,
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"percent_packet_loss": 40.0,
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"average_response_ms": 44.033,
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"standard_deviation_ms": 5.325,
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}
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acc.AssertContainsTaggedFields(t, "ping", fields, tags)
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}
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