renamed plugin to dns_query and value to query_time_ms

small polishings

added more record types - AAAA and ANY

README.md

@@ -157,6 +157,8 @@ Currently implemented sources:
 * bcache
 * couchdb
 * disque
+* dns
+    * query time
 * docker
 * dovecot
 * elasticsearch

plugins/inputs/dns/README.md

@@ -1,4 +1,4 @@
-# DNS Input Plugin
+# DNS Query Input Plugin
 
 The DNS plugin gathers dns query times in miliseconds - like [Dig](https://en.wikipedia.org/wiki/Dig_\(command\))
 
@@ -6,7 +6,7 @@ The DNS plugin gathers dns query times in miliseconds - like [Dig](https://en.wi
 
 ```
 # Sample Config:
-[[inputs.dns]]
+[[inputs.dns_query]]
   ### Domains or subdomains to query
   domains = ["mjasion.pl"] # required
 
@@ -26,12 +26,12 @@ The DNS plugin gathers dns query times in miliseconds - like [Dig](https://en.wi
 For querying more than one record type make:
  
 ```
-[[inputs.dns]]
+[[inputs.dns_query]]
   domains = ["mjasion.pl"]
   servers = ["8.8.8.8", "8.8.4.4"]
   recordType = "A"
 
-[[inputs.dns]]
+[[inputs.dns_query]]
   domains = ["mjasion.pl"]
   servers = ["8.8.8.8", "8.8.4.4"]
   recordType = "MX"
@@ -46,6 +46,6 @@ For querying more than one record type make:
 ### Example output:
 
 ```
-./telegraf -config telegraf.conf -test -input-filter dns -test
-> dns,domain=mjasion.pl,recordType=A,server=8.8.8.8 value=25.236181 1455452083165126877
+./telegraf -config telegraf.conf -test -input-filter dns_query -test
+> dns,domain=mjasion.pl,record_type=A,server=8.8.8.8 query_time_ms=36.327025 1455548824989943491
 ```

plugins/inputs/dns/dns_query.go

@@ -19,7 +19,7 @@ type Dns struct {
 	Servers []string
 
 	// Record type
-	RecordType string
+	RecordType string `toml:"record_type"`
 
 	// DNS server port number
 	Port int
@@ -35,8 +35,8 @@ var sampleConfig = `
   ### servers to query
   servers = ["8.8.8.8"] # required
 
-  ### Query record type. Posible values: A, CNAME, MX, TXT, NS. Default is "A"
-  recordType = "A" # optional
+  ### Query record type. Posible values: A, AAAA, CNAME, MX, TXT, NS, ANY. Default is "A"
+  record_type = "A" # optional
 
   ### Dns server port. 53 is default
   port = 53 # optional
@@ -63,10 +63,11 @@ func (d *Dns) Gather(acc telegraf.Accumulator) error {
 			tags := map[string]string{
 				"server":      server,
 				"domain":      domain,
-				"recordType": d.RecordType,
+				"record_type": d.RecordType,
 			}
 
-			acc.Add("dns", dnsQueryTime, tags)
+			fields := map[string]interface{}{"query_time_ms": dnsQueryTime}
+			acc.AddFields("dns", fields, tags)
 		}
 	}
 
@@ -99,18 +100,14 @@ func (d *Dns) getDnsQueryTime(domain string, server string) (float64, error) {
 	m.SetQuestion(dns.Fqdn(domain), recordType)
 	m.RecursionDesired = true
 
-	start_time := time.Now()
-	r, _, err := c.Exchange(m, net.JoinHostPort(server, strconv.Itoa(d.Port)))
-	queryDuration := time.Since(start_time)
-
+	r, rtt, err := c.Exchange(m, net.JoinHostPort(server, strconv.Itoa(d.Port)))
 	if err != nil {
 		return dnsQueryTime, err
 	}
 	if r.Rcode != dns.RcodeSuccess {
 		return dnsQueryTime, errors.New(fmt.Sprintf("Invalid answer name %s after %s query for %s\n", domain, d.RecordType, domain))
 	}
-
-	dnsQueryTime = float64(queryDuration.Nanoseconds()) / 1e6
+	dnsQueryTime = float64(rtt.Nanoseconds()) / 1e6
 	return dnsQueryTime, nil
 }
 
@@ -121,6 +118,10 @@ func (d *Dns) parseRecordType() (uint16, error) {
 	switch d.RecordType {
 	case "A":
 		recordType = dns.TypeA
+	case "AAAA":
+		recordType = dns.TypeAAAA
+	case "ANY":
+		recordType = dns.TypeANY
 	case "CNAME":
 		recordType = dns.TypeCNAME
 	case "MX":
@@ -137,7 +138,7 @@ func (d *Dns) parseRecordType() (uint16, error) {
 }
 
 func init() {
-	inputs.Add("dns", func() telegraf.Input {
+	inputs.Add("dns_query", func() telegraf.Input {
 		return &Dns{}
 	})
 }

plugins/inputs/dns/dns_query_test.go

@@ -20,7 +20,7 @@ func TestGathering(t *testing.T) {
 
 	dnsConfig.Gather(&acc)
 	metric, _ := acc.Get("dns")
-	queryTime, _ := metric.Fields["value"].(float64)
+	queryTime, _ := metric.Fields["query_time_ms"].(float64)
 
 	assert.NotEqual(t, 0, queryTime)
 }
@@ -35,7 +35,7 @@ func TestGatheringMxRecord(t *testing.T) {
 
 	dnsConfig.Gather(&acc)
 	metric, _ := acc.Get("dns")
-	queryTime, _ := metric.Fields["value"].(float64)
+	queryTime, _ := metric.Fields["query_time_ms"].(float64)
 
 	assert.NotEqual(t, 0, queryTime)
 }
@@ -49,15 +49,15 @@ func TestMetricContainsServerAndDomainAndRecordTypeTags(t *testing.T) {
 	tags := map[string]string{
 		"server":      "8.8.8.8",
 		"domain":      "mjasion.pl",
-		"recordType": "A",
+		"record_type": "A",
 	}
 	fields := map[string]interface{}{}
 
 	dnsConfig.Gather(&acc)
 	metric, _ := acc.Get("dns")
-	queryTime, _ := metric.Fields["value"].(float64)
+	queryTime, _ := metric.Fields["query_time_ms"].(float64)
 
-	fields["value"] = queryTime
+	fields["query_time_ms"] = queryTime
 	acc.AssertContainsTaggedFields(t, "dns", fields, tags)
 }
 
@@ -105,6 +105,14 @@ func TestRecordTypeParser(t *testing.T) {
 	recordType, err = dnsConfig.parseRecordType()
 	assert.Equal(t, dns.TypeA, recordType)
 
+	dnsConfig.RecordType = "AAAA"
+	recordType, err = dnsConfig.parseRecordType()
+	assert.Equal(t, dns.TypeAAAA, recordType)
+
+	dnsConfig.RecordType = "ANY"
+	recordType, err = dnsConfig.parseRecordType()
+	assert.Equal(t, dns.TypeANY, recordType)
+
 	dnsConfig.RecordType = "CNAME"
 	recordType, err = dnsConfig.parseRecordType()
 	assert.Equal(t, dns.TypeCNAME, recordType)