From 00aa2f34ceb42d71f537b757e11e682f3b1ad0ea Mon Sep 17 00:00:00 2001
From: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Date: Thu, 20 May 2021 17:26:11 -0300
Subject: [PATCH] Add tapestats to collect tape devices statistics

It is based on diskstats to allow metrics reuse by simply
s/disk/tape/ the query.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
---
 CHANGELOG.md                      |   2 +-
 collector/fixtures/e2e-output.txt |  31 ++
 collector/fixtures/sys.ttar       | 500 ++++++++++++++++++++++++++++++
 collector/tapestats_linux.go      | 151 +++++++++
 4 files changed, 683 insertions(+), 1 deletion(-)
 create mode 100644 collector/tapestats_linux.go

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5ab0b4b0d..6fcdf43e67 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 ## master / unreleased
 
 * [CHANGE]
-* [FEATURE]
+* [FEATURE] Add tapestats collector for Linux
 * [ENHANCEMENT]
 * [BUGFIX]
 
diff --git a/collector/fixtures/e2e-output.txt b/collector/fixtures/e2e-output.txt
index 19f40d2af6..a570f8e655 100644
--- a/collector/fixtures/e2e-output.txt
+++ b/collector/fixtures/e2e-output.txt
@@ -2796,6 +2796,7 @@ node_scrape_collector_success{collector="schedstat"} 1
 node_scrape_collector_success{collector="sockstat"} 1
 node_scrape_collector_success{collector="softnet"} 1
 node_scrape_collector_success{collector="stat"} 1
+node_scrape_collector_success{collector="tapestats"} 1
 node_scrape_collector_success{collector="textfile"} 1
 node_scrape_collector_success{collector="thermal_zone"} 1
 node_scrape_collector_success{collector="udp_queues"} 1
@@ -2882,6 +2883,36 @@ node_softnet_times_squeezed_total{cpu="0"} 1
 node_softnet_times_squeezed_total{cpu="1"} 10
 node_softnet_times_squeezed_total{cpu="2"} 85
 node_softnet_times_squeezed_total{cpu="3"} 50
+# HELP node_tape_io_now The number of I/Os currently outstanding to this device.
+# TYPE node_tape_io_now gauge
+node_tape_io_now{device="st0"} 1
+# HELP node_tape_io_others_total The number of I/Os issued to the tape drive other than read or write commands. The time taken to complete these commands uses the following calculation io_time_seconds_total-read_time_seconds_total-write_time_seconds_total
+# TYPE node_tape_io_others_total counter
+node_tape_io_others_total{device="st0"} 1409
+# HELP node_tape_io_time_seconds_total The amount of time spent waiting for all I/O to complete (including read and write). This includes tape movement commands such as seeking between file or set marks and implicit tape movement such as when rewind on close tape devices are used.
+# TYPE node_tape_io_time_seconds_total counter
+node_tape_io_time_seconds_total{device="st0"} 9247.01108772
+# HELP node_tape_read_bytes_total The number of bytes read from the tape drive.
+# TYPE node_tape_read_bytes_total counter
+node_tape_read_bytes_total{device="st0"} 9.79383912e+08
+# HELP node_tape_read_time_seconds_total The amount of time spent waiting for read requests to complete.
+# TYPE node_tape_read_time_seconds_total counter
+node_tape_read_time_seconds_total{device="st0"} 33.788355744
+# HELP node_tape_reads_completed_total The number of read requests issued to the tape drive.
+# TYPE node_tape_reads_completed_total counter
+node_tape_reads_completed_total{device="st0"} 3741
+# HELP node_tape_residual_total The number of times during a read or write we found the residual amount to be non-zero. This should mean that a program is issuing a read larger thean the block size on tape. For write not all data made it to tape.
+# TYPE node_tape_residual_total counter
+node_tape_residual_total{device="st0"} 19
+# HELP node_tape_write_time_seconds_total The amount of time spent waiting for write requests to complete.
+# TYPE node_tape_write_time_seconds_total counter
+node_tape_write_time_seconds_total{device="st0"} 5233.597394395
+# HELP node_tape_writes_completed_total The number of write requests issued to the tape drive.
+# TYPE node_tape_writes_completed_total counter
+node_tape_writes_completed_total{device="st0"} 5.3772916e+07
+# HELP node_tape_written_bytes_total The number of bytes written to the tape drive.
+# TYPE node_tape_written_bytes_total counter
+node_tape_written_bytes_total{device="st0"} 1.496246784e+12
 # HELP node_textfile_mtime_seconds Unixtime mtime of textfiles successfully read.
 # TYPE node_textfile_mtime_seconds gauge
 # HELP node_textfile_scrape_error 1 if there was an error opening or reading a file, 0 otherwise
diff --git a/collector/fixtures/sys.ttar b/collector/fixtures/sys.ttar
index acf1cec8de..4cea038fd1 100644
--- a/collector/fixtures/sys.ttar
+++ b/collector/fixtures/sys.ttar
@@ -1536,6 +1536,33 @@ Path: sys/class/powercap/intel-rapl:0:0/uevent
 Lines: 0
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 Mode: 755
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 Directory: sys/devices/pci0000:00
 Mode: 755
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diff --git a/collector/tapestats_linux.go b/collector/tapestats_linux.go
new file mode 100644
index 0000000000..fe76acf552
--- /dev/null
+++ b/collector/tapestats_linux.go
@@ -0,0 +1,151 @@
+// Copyright 2015 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 !notapestats
+
+package collector
+
+import (
+	"fmt"
+	"os"
+	"regexp"
+
+	"github.com/go-kit/log"
+	"github.com/go-kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/procfs/sysfs"
+	"gopkg.in/alecthomas/kingpin.v2"
+)
+
+var (
+	ignoredTapeDevices = kingpin.Flag("collector.tapestats.ignored-devices", "Regexp of devices to ignore for tapestats.").Default("^$").String()
+)
+
+type tapestatsCollector struct {
+	ignoredDevicesPattern *regexp.Regexp
+	ioNow                 *prometheus.Desc
+	ioTimeSeconds         *prometheus.Desc
+	othersCompletedTotal  *prometheus.Desc
+	readByteTotal         *prometheus.Desc
+	readsCompletedTotal   *prometheus.Desc
+	readTimeSeconds       *prometheus.Desc
+	writtenByteTotal      *prometheus.Desc
+	writesCompletedTotal  *prometheus.Desc
+	writeTimeSeconds      *prometheus.Desc
+	residualTotal         *prometheus.Desc
+	fs                    sysfs.FS
+	logger                log.Logger
+}
+
+func init() {
+	registerCollector("tapestats", defaultEnabled, NewTapestatsCollector)
+}
+
+// NewTapestatsCollector returns a new Collector exposing tape device stats.
+// Docs from https://www.kernel.org/doc/html/latest/scsi/st.html#sysfs-and-statistics-for-tape-devices
+func NewTapestatsCollector(logger log.Logger) (Collector, error) {
+	var tapeLabelNames = []string{"device"}
+
+	fs, err := sysfs.NewFS(*sysPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open sysfs: %w", err)
+	}
+
+	tapeSubsystem := "tape"
+
+	return &tapestatsCollector{
+		ignoredDevicesPattern: regexp.MustCompile(*ignoredTapeDevices),
+
+		ioNow: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, tapeSubsystem, "io_now"),
+			"The number of I/Os currently outstanding to this device.",
+			tapeLabelNames, nil,
+		),
+		ioTimeSeconds: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, tapeSubsystem, "io_time_seconds_total"),
+			"The amount of time spent waiting for all I/O to complete (including read and write). This includes tape movement commands such as seeking between file or set marks and implicit tape movement such as when rewind on close tape devices are used.",
+			tapeLabelNames, nil,
+		),
+		othersCompletedTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, tapeSubsystem, "io_others_total"),
+			"The number of I/Os issued to the tape drive other than read or write commands. The time taken to complete these commands uses the following calculation io_time_seconds_total-read_time_seconds_total-write_time_seconds_total",
+			tapeLabelNames, nil,
+		),
+		readByteTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, tapeSubsystem, "read_bytes_total"),
+			"The number of bytes read from the tape drive.",
+			tapeLabelNames, nil,
+		),
+		readsCompletedTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, tapeSubsystem, "reads_completed_total"),
+			"The number of read requests issued to the tape drive.",
+			tapeLabelNames, nil,
+		),
+		readTimeSeconds: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, tapeSubsystem, "read_time_seconds_total"),
+			"The amount of time spent waiting for read requests to complete.",
+			tapeLabelNames, nil,
+		),
+		writtenByteTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, tapeSubsystem, "written_bytes_total"),
+			"The number of bytes written to the tape drive.",
+			tapeLabelNames, nil,
+		),
+		writesCompletedTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, tapeSubsystem, "writes_completed_total"),
+			"The number of write requests issued to the tape drive.",
+			tapeLabelNames, nil,
+		),
+		writeTimeSeconds: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, tapeSubsystem, "write_time_seconds_total"),
+			"The amount of time spent waiting for write requests to complete.",
+			tapeLabelNames, nil,
+		),
+		residualTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, tapeSubsystem, "residual_total"),
+			"The number of times during a read or write we found the residual amount to be non-zero. This should mean that a program is issuing a read larger thean the block size on tape. For write not all data made it to tape.",
+			tapeLabelNames, nil,
+		),
+		logger: logger,
+		fs:     fs,
+	}, nil
+}
+
+func (c *tapestatsCollector) Update(ch chan<- prometheus.Metric) error {
+	tapes, err := c.fs.SCSITapeClass()
+	if err != nil {
+		if os.IsNotExist(err) {
+			level.Debug(c.logger).Log("msg", "scsi_tape stats not found, skipping")
+			return ErrNoData
+		}
+		return fmt.Errorf("error obtaining SCSITape class info: %s", err)
+	}
+
+	for _, tape := range tapes {
+		if c.ignoredDevicesPattern.MatchString(tape.Name) {
+			level.Debug(c.logger).Log("msg", "Ignoring device", "device", tape.Name)
+			continue
+		}
+		ch <- prometheus.MustNewConstMetric(c.ioNow, prometheus.GaugeValue, float64(tape.Counters.InFlight), tape.Name)
+		ch <- prometheus.MustNewConstMetric(c.ioTimeSeconds, prometheus.CounterValue, float64(tape.Counters.IoNs)*0.000000001, tape.Name)
+		ch <- prometheus.MustNewConstMetric(c.othersCompletedTotal, prometheus.CounterValue, float64(tape.Counters.OtherCnt), tape.Name)
+		ch <- prometheus.MustNewConstMetric(c.readByteTotal, prometheus.CounterValue, float64(tape.Counters.ReadByteCnt), tape.Name)
+		ch <- prometheus.MustNewConstMetric(c.readsCompletedTotal, prometheus.CounterValue, float64(tape.Counters.ReadCnt), tape.Name)
+		ch <- prometheus.MustNewConstMetric(c.readTimeSeconds, prometheus.CounterValue, float64(tape.Counters.ReadNs)*0.000000001, tape.Name)
+		ch <- prometheus.MustNewConstMetric(c.residualTotal, prometheus.CounterValue, float64(tape.Counters.ResidCnt), tape.Name)
+		ch <- prometheus.MustNewConstMetric(c.writtenByteTotal, prometheus.CounterValue, float64(tape.Counters.WriteByteCnt), tape.Name)
+		ch <- prometheus.MustNewConstMetric(c.writesCompletedTotal, prometheus.CounterValue, float64(tape.Counters.WriteCnt), tape.Name)
+		ch <- prometheus.MustNewConstMetric(c.writeTimeSeconds, prometheus.CounterValue, float64(tape.Counters.WriteNs)*0.000000001, tape.Name)
+	}
+	return nil
+}
