telegraf/plugins/inputs/bind/json_stats.go

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package bind
import (
"encoding/json"
"fmt"
"net"
"net/http"
"net/url"
"strings"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/metric"
)
type jsonStats struct {
OpCodes map[string]int
QTypes map[string]int
RCodes map[string]int
ZoneStats map[string]int
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NSStats map[string]int
SockStats map[string]int
Views map[string]jsonView
Memory jsonMemory
}
type jsonMemory struct {
TotalUse int64
InUse int64
BlockSize int64
ContextSize int64
Lost int64
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Contexts []struct {
Id string
Name string
Total int64
InUse int64
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}
}
type jsonView struct {
Resolver map[string]map[string]int
}
// addJSONCounter adds a counter array to a Telegraf Accumulator, with the specified tags.
func addJSONCounter(acc telegraf.Accumulator, commonTags map[string]string, stats map[string]int) {
grouper := metric.NewSeriesGrouper()
ts := time.Now()
for name, value := range stats {
if commonTags["type"] == "opcode" && strings.HasPrefix(name, "RESERVED") {
continue
}
tags := make(map[string]string)
// Create local copy of tags since maps are reference types
for k, v := range commonTags {
tags[k] = v
}
grouper.Add("bind_counter", tags, ts, name, value)
}
//Add grouped metrics
for _, metric := range grouper.Metrics() {
acc.AddMetric(metric)
}
}
// addStatsJson walks a jsonStats struct and adds the values to the telegraf.Accumulator.
func (b *Bind) addStatsJSON(stats jsonStats, acc telegraf.Accumulator, urlTag string) {
grouper := metric.NewSeriesGrouper()
ts := time.Now()
tags := map[string]string{"url": urlTag}
host, port, _ := net.SplitHostPort(urlTag)
tags["source"] = host
tags["port"] = port
// Opcodes
tags["type"] = "opcode"
addJSONCounter(acc, tags, stats.OpCodes)
// RCodes stats
tags["type"] = "rcode"
addJSONCounter(acc, tags, stats.RCodes)
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// Query RDATA types
tags["type"] = "qtype"
addJSONCounter(acc, tags, stats.QTypes)
// Nameserver stats
tags["type"] = "nsstat"
addJSONCounter(acc, tags, stats.NSStats)
// Socket statistics
tags["type"] = "sockstat"
addJSONCounter(acc, tags, stats.SockStats)
// Zonestats
tags["type"] = "zonestat"
addJSONCounter(acc, tags, stats.ZoneStats)
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// Memory stats
fields := map[string]interface{}{
"total_use": stats.Memory.TotalUse,
"in_use": stats.Memory.InUse,
"block_size": stats.Memory.BlockSize,
"context_size": stats.Memory.ContextSize,
"lost": stats.Memory.Lost,
}
acc.AddGauge("bind_memory", fields, map[string]string{"url": urlTag, "source": host, "port": port})
// Detailed, per-context memory stats
if b.GatherMemoryContexts {
for _, c := range stats.Memory.Contexts {
tags := map[string]string{"url": urlTag, "id": c.Id, "name": c.Name, "source": host, "port": port}
fields := map[string]interface{}{"total": c.Total, "in_use": c.InUse}
acc.AddGauge("bind_memory_context", fields, tags)
}
}
// Detailed, per-view stats
if b.GatherViews {
for vName, view := range stats.Views {
for cntrType, counters := range view.Resolver {
for cntrName, value := range counters {
tags := map[string]string{
"url": urlTag,
"source": host,
"port": port,
"view": vName,
"type": cntrType,
}
grouper.Add("bind_counter", tags, ts, cntrName, value)
}
}
}
}
//Add grouped metrics
for _, metric := range grouper.Metrics() {
acc.AddMetric(metric)
}
}
// readStatsJSON takes a base URL to probe, and requests the individual statistics blobs that we
// are interested in. These individual blobs have a combined size which is significantly smaller
// than if we requested everything at once (e.g. taskmgr and socketmgr can be omitted).
func (b *Bind) readStatsJSON(addr *url.URL, acc telegraf.Accumulator) error {
var stats jsonStats
// Progressively build up full jsonStats struct by parsing the individual HTTP responses
for _, suffix := range [...]string{"/server", "/net", "/mem"} {
scrapeUrl := addr.String() + suffix
resp, err := client.Get(scrapeUrl)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("%s returned HTTP status: %s", scrapeUrl, resp.Status)
}
if err := json.NewDecoder(resp.Body).Decode(&stats); err != nil {
return fmt.Errorf("Unable to decode JSON blob: %s", err)
}
}
b.addStatsJSON(stats, acc, addr.Host)
return nil
}