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implement systemd-resolved metrics collector (#119)
* implement systemd-resolved metrics collector - collect systemd-resolved metrics through dbus - add new option to enable collector Fixes: #37 --------- Signed-off-by: egmc <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| // Copyright 2023 The Prometheus Authors | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package resolved | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/go-kit/log" | ||
| "github.com/go-kit/log/level" | ||
| "github.com/godbus/dbus/v5" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| ) | ||
|
|
||
| const ( | ||
| namespace = "systemd" | ||
| subsystem = "resolved" | ||
| ) | ||
|
|
||
| type Collector struct { | ||
| ctx context.Context | ||
| logger log.Logger | ||
| } | ||
|
|
||
| var ( | ||
| resolvedCurrentTransactions = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, subsystem, "current_transactions"), | ||
| "Resolved Current Transactions", | ||
| nil, nil, | ||
| ) | ||
| resolvedTotalTransactions = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, subsystem, "transactions_total"), | ||
| "Resolved Total Transactions", | ||
| nil, nil, | ||
| ) | ||
| resolvedCurrentCacheSize = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, subsystem, "current_cache_size"), | ||
| "Resolved Current Cache Size", | ||
| nil, nil, | ||
| ) | ||
| resolvedTotalCacheHits = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, subsystem, "cache_hits_total"), | ||
| "Resolved Total Cache Hits", | ||
| nil, nil, | ||
| ) | ||
| resolvedTotalCacheMisses = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, subsystem, "cache_misses_total"), | ||
| "Resolved Total Cache Misses", | ||
| nil, nil, | ||
| ) | ||
| resolvedTotalSecure = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, subsystem, "dnssec_secure_total"), | ||
| "Resolved Total number of DNSSEC Verdicts Secure", | ||
| nil, nil, | ||
| ) | ||
| resolvedTotalInsecure = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, subsystem, "dnssec_insecure_total"), | ||
| "Resolved Total number of DNSSEC Verdicts Insecure", | ||
| nil, nil, | ||
| ) | ||
| resolvedTotalBogus = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, subsystem, "dnssec_bogus_total"), | ||
| "Resolved Total number of DNSSEC Verdicts Boguss", | ||
| nil, nil, | ||
| ) | ||
| resolvedTotalIndeterminate = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, subsystem, "dnssec_indeterminate_total"), | ||
| "Resolved Total number of DNSSEC Verdicts Indeterminat", | ||
| nil, nil, | ||
| ) | ||
| ) | ||
|
|
||
| // NewCollector returns a new Collector exporing resolved statistics | ||
| func NewCollector(logger log.Logger) (*Collector, error) { | ||
|
|
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| ctx := context.TODO() | ||
| return &Collector{ | ||
| ctx: ctx, | ||
| logger: logger, | ||
| }, nil | ||
| } | ||
|
|
||
| // Collect gathers metrics from resolved | ||
| func (c *Collector) Collect(ch chan<- prometheus.Metric) { | ||
| err := c.collect(ch) | ||
| if err != nil { | ||
| level.Error(c.logger).Log("msg", "error collecting resolved metrics", | ||
| "err", err) | ||
| } | ||
| } | ||
|
|
||
| // Describe gathers descriptions of metrics | ||
| func (c *Collector) Describe(desc chan<- *prometheus.Desc) { | ||
| desc <- resolvedCurrentTransactions | ||
| desc <- resolvedTotalTransactions | ||
| desc <- resolvedCurrentCacheSize | ||
| desc <- resolvedTotalCacheHits | ||
| desc <- resolvedTotalCacheMisses | ||
| desc <- resolvedTotalSecure | ||
| desc <- resolvedTotalInsecure | ||
| desc <- resolvedTotalBogus | ||
| desc <- resolvedTotalIndeterminate | ||
| } | ||
|
|
||
| func parseProperty(object dbus.BusObject, path string) (ret []float64, err error) { | ||
| variant, err := object.GetProperty(path) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| for _, v := range variant.Value().([]interface{}) { | ||
| i := v.(uint64) | ||
| ret = append(ret, float64(i)) | ||
| } | ||
| return ret, err | ||
| } | ||
|
|
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| func (c *Collector) collect(ch chan<- prometheus.Metric) error { | ||
|
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| conn, err := dbus.ConnectSystemBus() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| defer conn.Close() | ||
|
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| obj := conn.Object("org.freedesktop.resolve1", "/org/freedesktop/resolve1") | ||
|
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| cacheStats, err := parseProperty(obj, "org.freedesktop.resolve1.Manager.CacheStatistics") | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| ch <- prometheus.MustNewConstMetric(resolvedCurrentCacheSize, prometheus.GaugeValue, | ||
| float64(cacheStats[0])) | ||
| ch <- prometheus.MustNewConstMetric(resolvedTotalCacheHits, prometheus.CounterValue, | ||
| float64(cacheStats[1])) | ||
| ch <- prometheus.MustNewConstMetric(resolvedTotalCacheMisses, prometheus.CounterValue, | ||
| float64(cacheStats[2])) | ||
|
|
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| transactionStats, err := parseProperty(obj, "org.freedesktop.resolve1.Manager.TransactionStatistics") | ||
| ch <- prometheus.MustNewConstMetric(resolvedCurrentTransactions, prometheus.GaugeValue, | ||
| float64(transactionStats[0])) | ||
| ch <- prometheus.MustNewConstMetric(resolvedTotalTransactions, prometheus.CounterValue, | ||
| float64(transactionStats[1])) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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||
| dnssecStats, err := parseProperty(obj, "org.freedesktop.resolve1.Manager.DNSSECStatistics") | ||
| ch <- prometheus.MustNewConstMetric(resolvedTotalSecure, prometheus.CounterValue, | ||
| float64(dnssecStats[0])) | ||
| ch <- prometheus.MustNewConstMetric(resolvedTotalInsecure, prometheus.CounterValue, | ||
| float64(dnssecStats[1])) | ||
| ch <- prometheus.MustNewConstMetric(resolvedTotalBogus, prometheus.CounterValue, | ||
| float64(dnssecStats[2])) | ||
| ch <- prometheus.MustNewConstMetric(resolvedTotalIndeterminate, prometheus.CounterValue, | ||
| float64(dnssecStats[3])) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } |