Initial XFS collector

1 files changed, 140 insertions, 0 deletions

diff --git a/collector/xfs_linux.go b/collector/xfs_linux.go
new file mode 100644
index 0000000..849cbff
--- /dev/null
+++ b/collector/xfs_linux.go
@@ -0,0 +1,140 @@
+// Copyright 2017 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 collector
+
+import (
+        "fmt"
+
+        "github.com/prometheus/client_golang/prometheus"
+        "github.com/prometheus/procfs/sysfs"
+        "github.com/prometheus/procfs/xfs"
+)
+
+// An xfsCollector is a Collector which gathers metrics from XFS filesystems.
+type xfsCollector struct {
+        fs sysfs.FS
+}
+
+func init() {
+        Factories["xfs"] = NewXFSCollector
+}
+
+// NewXFSCollector returns a new Collector exposing XFS statistics.
+func NewXFSCollector() (Collector, error) {
+        fs, err := sysfs.NewFS(*sysPath)
+        if err != nil {
+                return nil, fmt.Errorf("failed to open sysfs: %v", err)
+        }
+
+        return &xfsCollector{
+                fs: fs,
+        }, nil
+}
+
+// Update implements Collector.
+func (c *xfsCollector) Update(ch chan<- prometheus.Metric) error {
+        stats, err := c.fs.XFSStats()
+        if err != nil {
+                return fmt.Errorf("failed to retrieve XFS stats: %v", err)
+        }
+
+        for _, s := range stats {
+                c.updateXFSStats(ch, s)
+        }
+
+        return nil
+}
+
+// updateXFSStats collects statistics for a single XFS filesystem.
+func (c *xfsCollector) updateXFSStats(ch chan<- prometheus.Metric, s *xfs.Stats) {
+        const (
+                subsystem = "xfs"
+        )
+
+        var (
+                labels = []string{"device"}
+        )
+
+        // Metric names and descriptions are sourced from:
+        // http://xfs.org/index.php/Runtime_Stats.
+        //
+        // Each metric has a name that roughly follows the pattern of
+        // "node_xfs_category_value_total", using the categories and value names
+        // found on the XFS wiki.
+        //
+        // Note that statistics for more than one internal B-tree are measured,
+        // and as such, each one must be differentiated by name.
+        metrics := []struct {
+                name  string
+                desc  string
+                value float64
+        }{
+                {
+                        name:  "extent_allocation_extents_allocated_total",
+                        desc:  "Number of extents allocated for a filesystem.",
+                        value: float64(s.ExtentAllocation.ExtentsAllocated),
+                },
+                {
+                        name:  "extent_allocation_blocks_allocated_total",
+                        desc:  "Number of blocks allocated for a filesystem.",
+                        value: float64(s.ExtentAllocation.BlocksAllocated),
+                },
+                {
+                        name:  "extent_allocation_extents_freed_total",
+                        desc:  "Number of extents freed for a filesystem.",
+                        value: float64(s.ExtentAllocation.ExtentsFreed),
+                },
+                {
+                        name:  "extent_allocation_blocks_freed_total",
+                        desc:  "Number of blocks freed for a filesystem.",
+                        value: float64(s.ExtentAllocation.BlocksFreed),
+                },
+                {
+                        name:  "allocation_btree_lookups_total",
+                        desc:  "Number of allocation B-tree lookups for a filesystem.",
+                        value: float64(s.AllocationBTree.Lookups),
+                },
+                {
+                        name:  "allocation_btree_compares_total",
+                        desc:  "Number of allocation B-tree compares for a filesystem.",
+                        value: float64(s.AllocationBTree.Compares),
+                },
+                {
+                        name:  "allocation_btree_records_inserted_total",
+                        desc:  "Number of allocation B-tree records inserted for a filesystem.",
+                        value: float64(s.AllocationBTree.RecordsInserted),
+                },
+                {
+                        name:  "allocation_btree_records_deleted_total",
+                        desc:  "Number of allocation B-tree records deleted for a filesystem.",
+                        value: float64(s.AllocationBTree.RecordsDeleted),
+                },
+        }
+
+        for _, m := range metrics {
+                desc := prometheus.NewDesc(
+                        prometheus.BuildFQName(Namespace, subsystem, m.name),
+                        m.desc,
+                        labels,
+                        nil,
+                )
+
+                ch <- prometheus.MustNewConstMetric(
+                        desc,
+                        prometheus.CounterValue,
+                        m.value,
+                        s.Name,
+                )
+        }
+}