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Add NetStat to parse /proc/net/stat/... (#316)
* Add NetStat to parse /proc/net/stat/... Signed-off-by: Aleksei Zakharov <zaharov@selectel.ru>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| // Copyright 2020 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 procfs | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "os" | ||
| "path/filepath" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
|
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| // NetStat contains statistics for all the counters from one file | ||
| type NetStat struct { | ||
| Filename string | ||
| Stats map[string][]uint64 | ||
| } | ||
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| // NetStat retrieves stats from /proc/net/stat/ | ||
| func (fs FS) NetStat() ([]NetStat, error) { | ||
| statFiles, err := filepath.Glob(fs.proc.Path("net/stat/*")) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| var netStatsTotal []NetStat | ||
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| for _, filePath := range statFiles { | ||
| file, err := os.Open(filePath) | ||
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| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| netStatFile := NetStat{ | ||
| Filename: filepath.Base(filePath), | ||
| Stats: make(map[string][]uint64), | ||
| } | ||
| scanner := bufio.NewScanner(file) | ||
| scanner.Scan() | ||
| // First string is always a header for stats | ||
| var headers []string | ||
| headers = append(headers, strings.Fields(scanner.Text())...) | ||
|
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| // Other strings represent per-CPU counters | ||
| for scanner.Scan() { | ||
| for num, counter := range strings.Fields(scanner.Text()) { | ||
| value, err := strconv.ParseUint(counter, 16, 32) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| netStatFile.Stats[headers[num]] = append(netStatFile.Stats[headers[num]], value) | ||
| } | ||
| } | ||
| netStatsTotal = append(netStatsTotal, netStatFile) | ||
| } | ||
| return netStatsTotal, nil | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| // Copyright 2020 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. | ||
|
|
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| package procfs | ||
|
|
||
| import ( | ||
| "testing" | ||
| ) | ||
|
|
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| func TestNetStat(t *testing.T) { | ||
| const ( | ||
| filesCount = 2 | ||
| CPUsCount = 2 | ||
| arpCacheMetricsCount = 13 | ||
| ndiscCacheMetricsCount = 13 | ||
| ) | ||
|
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| fs, err := NewFS(procTestFixtures) | ||
| if err != nil { | ||
| t.Fatalf("failed to open procfs: %v", err) | ||
| } | ||
|
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| netStats, err := fs.NetStat() | ||
| if err != nil { | ||
| t.Fatalf("NetStat() error: %s", err) | ||
| } | ||
|
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| if len(netStats) != filesCount { | ||
| t.Fatalf("unexpected number of files parsed %d, expected %d", len(netStats), filesCount) | ||
| } | ||
|
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| expectedStats := [2]NetStat{ | ||
| { | ||
| Filename: "arp_cache", | ||
| Stats: make(map[string][]uint64), | ||
| }, | ||
| { | ||
| Filename: "ndisc_cache", | ||
| Stats: make(map[string][]uint64), | ||
| }, | ||
| } | ||
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| for _, expected := range expectedStats { | ||
| if expected.Filename == "arp_cache" { | ||
| expected.Stats["entries"] = []uint64{20, 20} | ||
| expected.Stats["allocs"] = []uint64{1, 13} | ||
| expected.Stats["destroys"] = []uint64{2, 14} | ||
| expected.Stats["hash_grows"] = []uint64{3, 15} | ||
| expected.Stats["lookups"] = []uint64{4, 16} | ||
| expected.Stats["hits"] = []uint64{5, 17} | ||
| expected.Stats["res_failed"] = []uint64{6, 18} | ||
| expected.Stats["rcv_probes_mcast"] = []uint64{7, 19} | ||
| expected.Stats["rcv_probes_ucast"] = []uint64{8, 20} | ||
| expected.Stats["periodic_gc_runs"] = []uint64{9, 21} | ||
| expected.Stats["forced_gc_runs"] = []uint64{10, 22} | ||
| expected.Stats["unresolved_discards"] = []uint64{11, 23} | ||
| expected.Stats["table_fulls"] = []uint64{12, 24} | ||
| } | ||
| if expected.Filename == "ndisc_cache" { | ||
| expected.Stats["entries"] = []uint64{36, 36} | ||
| expected.Stats["allocs"] = []uint64{240, 252} | ||
| expected.Stats["destroys"] = []uint64{241, 253} | ||
| expected.Stats["hash_grows"] = []uint64{242, 254} | ||
| expected.Stats["lookups"] = []uint64{243, 255} | ||
| expected.Stats["hits"] = []uint64{244, 256} | ||
| expected.Stats["res_failed"] = []uint64{245, 257} | ||
| expected.Stats["rcv_probes_mcast"] = []uint64{246, 258} | ||
| expected.Stats["rcv_probes_ucast"] = []uint64{247, 259} | ||
| expected.Stats["periodic_gc_runs"] = []uint64{248, 260} | ||
| expected.Stats["forced_gc_runs"] = []uint64{249, 261} | ||
| expected.Stats["unresolved_discards"] = []uint64{250, 262} | ||
| expected.Stats["table_fulls"] = []uint64{251, 263} | ||
| } | ||
| } | ||
|
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| for _, netStatFile := range netStats { | ||
| if netStatFile.Filename == "arp_cache" && len(netStatFile.Stats) != arpCacheMetricsCount { | ||
| t.Fatalf("unexpected arp_cache metrics count %d, expected %d", len(netStatFile.Stats), arpCacheMetricsCount) | ||
| } | ||
| if netStatFile.Filename == "ndisc_cache" && len(netStatFile.Stats) != ndiscCacheMetricsCount { | ||
| t.Fatalf("unexpected ndisc_cache metrics count %d, expected %d", len(netStatFile.Stats), ndiscCacheMetricsCount) | ||
| } | ||
| for _, expected := range expectedStats { | ||
| for header, stats := range netStatFile.Stats { | ||
| if header == "" { | ||
| t.Fatalf("Found empty metric name") | ||
| } | ||
| if len(stats) != CPUsCount { | ||
| t.Fatalf("NetStat() parsed %d lines with metrics, expected %d", len(stats), CPUsCount) | ||
| } | ||
| if netStatFile.Filename == expected.Filename { | ||
| if expected.Stats[header] == nil { | ||
| t.Fatalf("unexpected metric header: %s", header) | ||
| } | ||
| for cpu, value := range netStatFile.Stats[header] { | ||
| if expected.Stats[header][cpu] != value { | ||
| t.Fatalf("unexpected value for %s for cpu %d in %s: %d, expected %d", header, cpu, netStatFile.Filename, value, expected.Stats[header][cpu]) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
Would you want to defer closing each of the files after you are done processing them, or are you keeping them open because they will be queried regularly?