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fixtures/sys/devices/pci0000:00/0000:00:0d.0 Mode: 755 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - diff --git a/sysfs/class_scsitape.go b/sysfs/class_scsitape.go new file mode 100644 index 000000000..d227c10fa --- /dev/null +++ b/sysfs/class_scsitape.go @@ -0,0 +1,140 @@ +// Copyright 2021 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. + +// +build linux + +package sysfs + +import ( + "fmt" + "io/ioutil" + "path/filepath" + "regexp" + + "github.com/prometheus/procfs/internal/util" +) + +const scsiTapeClassPath = "class/scsi_tape" + +type SCSITapeCounters struct { + WriteNs uint64 // /sys/class/scsi_tape//stats/write_ns + ReadByteCnt uint64 // /sys/class/scsi_tape//stats/read_byte_cnt + IoNs uint64 // /sys/class/scsi_tape//stats/io_ns + WriteCnt uint64 // /sys/class/scsi_tape//stats/write_cnt + ResidCnt uint64 // /sys/class/scsi_tape//stats/resid_cnt + ReadNs uint64 // /sys/class/scsi_tape//stats/read_ns + InFlight uint64 // /sys/class/scsi_tape//stats/in_flight + OtherCnt uint64 // /sys/class/scsi_tape//stats/other_cnt + ReadCnt uint64 // /sys/class/scsi_tape//stats/read_cnt + WriteByteCnt uint64 // /sys/class/scsi_tape//stats/write_byte_cnt +} + +type SCSITape struct { + Name string // /sys/class/scsi_tape/ + Counters SCSITapeCounters // /sys/class/scsi_tape//statistics/* +} + +type SCSITapeClass map[string]SCSITape + +// SCSITapeClass parses st[0-9]+ devices in /sys/class/scsi_tape. +func (fs FS) SCSITapeClass() (SCSITapeClass, error) { + path := fs.sys.Path(scsiTapeClassPath) + + dirs, err := ioutil.ReadDir(path) + if err != nil { + return nil, err + } + + // There are n?st[0-9]+[a-b]? variants depending on device features. + // n/2 is probably overestimated but never underestimated + stc := make(SCSITapeClass, len(dirs)/2) + validDevice := regexp.MustCompile(`^st[0-9]+$`) + + for _, d := range dirs { + if !validDevice.Match([]byte(d.Name())) { + continue + } + tape, err := fs.parseSCSITape(d.Name()) + if err != nil { + return nil, err + } + + stc[tape.Name] = *tape + } + + return stc, nil +} + +// Parse a single scsi_tape +func (fs FS) parseSCSITape(name string) (*SCSITape, error) { + path := fs.sys.Path(scsiTapeClassPath, name) + tape := SCSITape{Name: name} + + counters, err := parseSCSITapeStatistics(path) + if err != nil { + return nil, err + } + tape.Counters = *counters + + return &tape, nil +} + +// parseSCSITapeStatistics parses metrics from a single tape. +func parseSCSITapeStatistics(tapePath string) (*SCSITapeCounters, error) { + var counters SCSITapeCounters + + path := filepath.Join(tapePath, "stats") + files, err := ioutil.ReadDir(path) + if err != nil { + return nil, err + } + + for _, f := range files { + name := filepath.Join(path, f.Name()) + value, err := util.SysReadFile(name) + if err != nil { + return nil, fmt.Errorf("failed to read file %q: %w", name, err) + } + + vp := util.NewValueParser(value) + switch f.Name() { + case "in_flight": + counters.InFlight = *vp.PUInt64() + case "io_ns": + counters.IoNs = *vp.PUInt64() + case "other_cnt": + counters.OtherCnt = *vp.PUInt64() + case "read_byte_cnt": + counters.ReadByteCnt = *vp.PUInt64() + case "read_cnt": + counters.ReadCnt = *vp.PUInt64() + case "read_ns": + counters.ReadNs = *vp.PUInt64() + case "resid_cnt": + counters.ResidCnt = *vp.PUInt64() + case "write_byte_cnt": + counters.WriteByteCnt = *vp.PUInt64() + case "write_cnt": + counters.WriteCnt = *vp.PUInt64() + case "write_ns": + counters.WriteNs = *vp.PUInt64() + } + + if err := vp.Err(); err != nil { + return nil, err + } + + } + + return &counters, nil +} diff --git a/sysfs/class_scsitape_test.go b/sysfs/class_scsitape_test.go new file mode 100644 index 000000000..17480d441 --- /dev/null +++ b/sysfs/class_scsitape_test.go @@ -0,0 +1,56 @@ +// Copyright 2021 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. + +// +build linux + +package sysfs + +import ( + "testing" + + "github.com/google/go-cmp/cmp" +) + +func TestSCSITapeClass(t *testing.T) { + fs, err := NewFS(sysTestFixtures) + if err != nil { + t.Fatal(err) + } + + got, err := fs.SCSITapeClass() + if err != nil { + t.Fatal(err) + } + + want := SCSITapeClass{ + "st0": SCSITape{ + Name: "st0", + Counters: SCSITapeCounters{ + WriteNs: 5233597394395, + ReadByteCnt: 979383912, + IoNs: 9247011087720, + WriteCnt: 53772916, + WriteByteCnt: 1496246784000, + ResidCnt: 19, + ReadNs: 33788355744, + InFlight: 1, + OtherCnt: 1409, + ReadCnt: 3741, + }, + }, + } + + if diff := cmp.Diff(want, got); diff != "" { + t.Fatalf("unexpected SCSITape class (-want +got):\n%s", diff) + } +}