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| 1 | +// Copyright 2015 The Prometheus Authors |
| 2 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 3 | +// you may not use this file except in compliance with the License. |
| 4 | +// You may obtain a copy of the License at |
| 5 | +// |
| 6 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | +// |
| 8 | +// Unless required by applicable law or agreed to in writing, software |
| 9 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 10 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 11 | +// See the License for the specific language governing permissions and |
| 12 | +// limitations under the License. |
| 13 | + |
| 14 | +//go:build !noudp_drops |
| 15 | +// +build !noudp_drops |
| 16 | + |
| 17 | +package collector |
| 18 | + |
| 19 | +import ( |
| 20 | + "errors" |
| 21 | + "fmt" |
| 22 | + "log/slog" |
| 23 | + "os" |
| 24 | + |
| 25 | + "github.com/prometheus/client_golang/prometheus" |
| 26 | + "github.com/prometheus/procfs" |
| 27 | +) |
| 28 | + |
| 29 | +type ( |
| 30 | + udpDropsCollector struct { |
| 31 | + fs procfs.FS |
| 32 | + desc *prometheus.Desc |
| 33 | + logger *slog.Logger |
| 34 | + } |
| 35 | +) |
| 36 | + |
| 37 | +func init() { |
| 38 | + registerCollector("udp_drops", defaultEnabled, NewUDPdropsCollector) |
| 39 | +} |
| 40 | + |
| 41 | +// NewUDPdropsCollector returns a new Collector exposing network udp drops count. |
| 42 | +func NewUDPdropsCollector(logger *slog.Logger) (Collector, error) { |
| 43 | + fs, err := procfs.NewFS(*procPath) |
| 44 | + if err != nil { |
| 45 | + return nil, fmt.Errorf("failed to open procfs: %w", err) |
| 46 | + } |
| 47 | + return &udpDropsCollector{ |
| 48 | + fs: fs, |
| 49 | + desc: prometheus.NewDesc( |
| 50 | + prometheus.BuildFQName(namespace, "udp", "drops_total"), |
| 51 | + "Total number of datagrams dropped.", |
| 52 | + []string{"ip"}, nil, |
| 53 | + ), |
| 54 | + logger: logger, |
| 55 | + }, nil |
| 56 | +} |
| 57 | + |
| 58 | +func (c *udpDropsCollector) Update(ch chan<- prometheus.Metric) error { |
| 59 | + |
| 60 | + s4, errIPv4 := c.fs.NetUDPSummary() |
| 61 | + if errIPv4 == nil { |
| 62 | + if s4.Drops != nil { |
| 63 | + ch <- prometheus.MustNewConstMetric(c.desc, prometheus.CounterValue, float64(*s4.Drops), "v4") |
| 64 | + } |
| 65 | + } else { |
| 66 | + if errors.Is(errIPv4, os.ErrNotExist) { |
| 67 | + c.logger.Debug("not collecting ipv4 based metrics") |
| 68 | + } else { |
| 69 | + return fmt.Errorf("couldn't get udp drops: %w", errIPv4) |
| 70 | + } |
| 71 | + } |
| 72 | + |
| 73 | + s6, errIPv6 := c.fs.NetUDP6Summary() |
| 74 | + if errIPv6 == nil { |
| 75 | + if s6.Drops != nil { |
| 76 | + ch <- prometheus.MustNewConstMetric(c.desc, prometheus.CounterValue, float64(*s6.Drops), "v6") |
| 77 | + } |
| 78 | + } else { |
| 79 | + if errors.Is(errIPv6, os.ErrNotExist) { |
| 80 | + c.logger.Debug("not collecting ipv6 based metrics") |
| 81 | + } else { |
| 82 | + return fmt.Errorf("couldn't get udp6 drops: %w", errIPv6) |
| 83 | + } |
| 84 | + } |
| 85 | + |
| 86 | + if errors.Is(errIPv4, os.ErrNotExist) && errors.Is(errIPv6, os.ErrNotExist) { |
| 87 | + return ErrNoData |
| 88 | + } |
| 89 | + return nil |
| 90 | +} |
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