Add configuration structs to all usage as a library.

collector/arp_linux.go

@@ -21,47 +21,42 @@ import (
 	"fmt"
 	"net"
 
-	"github.com/alecthomas/kingpin/v2"
 	"github.com/go-kit/log"
 	"github.com/jsimonetti/rtnetlink"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/procfs"
 	"golang.org/x/sys/unix"
 )
 
-var (
-	arpDeviceInclude = kingpin.Flag("collector.arp.device-include", "Regexp of arp devices to include (mutually exclusive to device-exclude).").String()
-	arpDeviceExclude = kingpin.Flag("collector.arp.device-exclude", "Regexp of arp devices to exclude (mutually exclusive to device-include).").String()
-	arpNetlink       = kingpin.Flag("collector.arp.netlink", "Use netlink to gather stats instead of /proc/net/arp.").Default("true").Bool()
-)
-
 type arpCollector struct {
 	fs           procfs.FS
 	deviceFilter deviceFilter
 	entries      *prometheus.Desc
 	logger       log.Logger
+	config       *NodeCollectorConfig
 }
 
 func init() {
 	registerCollector("arp", defaultEnabled, NewARPCollector)
 }
 
 // NewARPCollector returns a new Collector exposing ARP stats.
-func NewARPCollector(logger log.Logger) (Collector, error) {
-	fs, err := procfs.NewFS(*procPath)
+func NewARPCollector(config *NodeCollectorConfig, logger log.Logger) (Collector, error) {
+	fs, err := procfs.NewFS(*config.Path.ProcPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to open procfs: %w", err)
 	}
 
 	return &arpCollector{
 		fs:           fs,
-		deviceFilter: newDeviceFilter(*arpDeviceExclude, *arpDeviceInclude),
+		deviceFilter: newDeviceFilter(*config.Arp.DeviceExclude, *config.Arp.DeviceInclude),
 		entries: prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "arp", "entries"),
 			"ARP entries by device",
 			[]string{"device"}, nil,
 		),
 		logger: logger,
+		config: config,
 	}, nil
 }
 
@@ -119,7 +114,7 @@ func getTotalArpEntriesRTNL() (map[string]uint32, error) {
 func (c *arpCollector) Update(ch chan<- prometheus.Metric) error {
 	var enumeratedEntry map[string]uint32
 
-	if *arpNetlink {
+	if *c.config.Arp.Netlink {
 		var err error
 
 		enumeratedEntry, err = getTotalArpEntriesRTNL()

collector/bcache_linux.go

@@ -19,37 +19,35 @@ package collector
 import (
 	"fmt"
 
-	"github.com/alecthomas/kingpin/v2"
 	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/procfs/bcache"
 )
 
-var (
-	priorityStats = kingpin.Flag("collector.bcache.priorityStats", "Expose expensive priority stats.").Bool()
-)
-
 func init() {
 	registerCollector("bcache", defaultEnabled, NewBcacheCollector)
+
 }
 
 // A bcacheCollector is a Collector which gathers metrics from Linux bcache.
 type bcacheCollector struct {
 	fs     bcache.FS
 	logger log.Logger
+	config *NodeCollectorConfig
 }
 
 // NewBcacheCollector returns a newly allocated bcacheCollector.
 // It exposes a number of Linux bcache statistics.
-func NewBcacheCollector(logger log.Logger) (Collector, error) {
-	fs, err := bcache.NewFS(*sysPath)
+func NewBcacheCollector(config *NodeCollectorConfig, logger log.Logger) (Collector, error) {
+	fs, err := bcache.NewFS(*config.Path.SysPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to open sysfs: %w", err)
 	}
 
 	return &bcacheCollector{
 		fs:     fs,
 		logger: logger,
+		config: config,
 	}, nil
 }
 
@@ -58,7 +56,7 @@ func NewBcacheCollector(logger log.Logger) (Collector, error) {
 func (c *bcacheCollector) Update(ch chan<- prometheus.Metric) error {
 	var stats []*bcache.Stats
 	var err error
-	if *priorityStats {
+	if *c.config.Bcache.PriorityStats {
 		stats, err = c.fs.Stats()
 	} else {
 		stats, err = c.fs.StatsWithoutPriority()
@@ -317,7 +315,7 @@ func (c *bcacheCollector) updateBcacheStats(ch chan<- prometheus.Metric, s *bcac
 				extraLabelValue: cache.Name,
 			},
 		}
-		if *priorityStats {
+		if *c.config.Bcache.PriorityStats {
 			// metrics in /sys/fs/bcache/<uuid>/<cache>/priority_stats
 			priorityStatsMetrics := []bcacheMetric{
 				{

collector/bonding_linux.go

@@ -31,6 +31,7 @@ import (
 type bondingCollector struct {
 	slaves, active typedDesc
 	logger         log.Logger
+	config         *NodeCollectorConfig
 }
 
 func init() {
@@ -39,7 +40,7 @@ func init() {
 
 // NewBondingCollector returns a newly allocated bondingCollector.
 // It exposes the number of configured and active slave of linux bonding interfaces.
-func NewBondingCollector(logger log.Logger) (Collector, error) {
+func NewBondingCollector(config *NodeCollectorConfig, logger log.Logger) (Collector, error) {
 	return &bondingCollector{
 		slaves: typedDesc{prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "bonding", "slaves"),
@@ -52,12 +53,13 @@ func NewBondingCollector(logger log.Logger) (Collector, error) {
 			[]string{"master"}, nil,
 		), prometheus.GaugeValue},
 		logger: logger,
+		config: config,
 	}, nil
 }
 
 // Update reads and exposes bonding states, implements Collector interface. Caution: This works only on linux.
 func (c *bondingCollector) Update(ch chan<- prometheus.Metric) error {
-	statusfile := sysFilePath("class/net")
+	statusfile := c.config.Path.sysFilePath("class/net")
 	bondingStats, err := readBondingStats(statusfile)
 	if err != nil {
 		if errors.Is(err, os.ErrNotExist) {

collector/boot_time_bsd.go

@@ -32,7 +32,7 @@ func init() {
 }
 
 // newBootTimeCollector returns a new Collector exposing system boot time on BSD systems.
-func newBootTimeCollector(logger log.Logger) (Collector, error) {
+func newBootTimeCollector(config *NodeCollectorConfig, logger log.Logger) (Collector, error) {
 	return &bootTimeCollector{
 		logger: logger,
 	}, nil

collector/boot_time_solaris.go

@@ -31,7 +31,7 @@ func init() {
 	registerCollector("boottime", defaultEnabled, newBootTimeCollector)
 }
 
-func newBootTimeCollector(logger log.Logger) (Collector, error) {
+func newBootTimeCollector(config *NodeCollectorConfig, logger log.Logger) (Collector, error) {
 	return &bootTimeCollector{
 		boottime: typedDesc{
 			prometheus.NewDesc(

collector/btrfs_linux.go

@@ -33,22 +33,24 @@ import (
 type btrfsCollector struct {
 	fs     btrfs.FS
 	logger log.Logger
+	config *NodeCollectorConfig
 }
 
 func init() {
 	registerCollector("btrfs", defaultEnabled, NewBtrfsCollector)
 }
 
 // NewBtrfsCollector returns a new Collector exposing Btrfs statistics.
-func NewBtrfsCollector(logger log.Logger) (Collector, error) {
-	fs, err := btrfs.NewFS(*sysPath)
+func NewBtrfsCollector(config *NodeCollectorConfig, logger log.Logger) (Collector, error) {
+	fs, err := btrfs.NewFS(*config.Path.SysPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to open sysfs: %w", err)
 	}
 
 	return &btrfsCollector{
 		fs:     fs,
 		logger: logger,
+		config: config,
 	}, nil
 }
 
@@ -103,7 +105,7 @@ type btrfsIoctlFsStats struct {
 func (c *btrfsCollector) getIoctlStats() (map[string]*btrfsIoctlFsStats, error) {
 	// Instead of introducing more ioctl calls to scan for all btrfs
 	// filesystems re-use our mount point utils to find known mounts
-	mountsList, err := mountPointDetails(c.logger)
+	mountsList, err := mountPointDetails(c.config, c.logger)
 	if err != nil {
 		return nil, err
 	}
@@ -123,7 +125,7 @@ func (c *btrfsCollector) getIoctlStats() (map[string]*btrfsIoctlFsStats, error)
 			continue
 		}
 
-		mountPath := rootfsFilePath(mount.mountPoint)
+		mountPath := c.config.Path.rootfsFilePath(mount.mountPoint)
 
 		fs, err := dennwc.Open(mountPath, true)
 		if err != nil {

collector/buddyinfo.go

@@ -41,13 +41,13 @@ func init() {
 }
 
 // NewBuddyinfoCollector returns a new Collector exposing buddyinfo stats.
-func NewBuddyinfoCollector(logger log.Logger) (Collector, error) {
+func NewBuddyinfoCollector(config *NodeCollectorConfig, logger log.Logger) (Collector, error) {
 	desc := prometheus.NewDesc(
 		prometheus.BuildFQName(namespace, buddyInfoSubsystem, "blocks"),
 		"Count of free blocks according to size.",
 		[]string{"node", "zone", "size"}, nil,
 	)
-	fs, err := procfs.NewFS(*procPath)
+	fs, err := procfs.NewFS(*config.Path.ProcPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to open procfs: %w", err)
 	}

collector/cgroups_linux.go

@@ -38,8 +38,8 @@ func init() {
 }
 
 // NewCgroupSummaryCollector returns a new Collector exposing a summary of cgroups.
-func NewCgroupSummaryCollector(logger log.Logger) (Collector, error) {
-	fs, err := procfs.NewFS(*procPath)
+func NewCgroupSummaryCollector(config *NodeCollectorConfig, logger log.Logger) (Collector, error) {
+	fs, err := procfs.NewFS(*config.Path.ProcPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to open procfs: %w", err)
 	}

collector/collector.go

@@ -50,27 +50,39 @@ const (
 )
 
 var (
-	factories              = make(map[string]func(logger log.Logger) (Collector, error))
+	factories              = make(map[string]func(config *NodeCollectorConfig, logger log.Logger) (Collector, error))
 	initiatedCollectorsMtx = sync.Mutex{}
 	initiatedCollectors    = make(map[string]Collector)
-	collectorState         = make(map[string]*bool)
+	collectorStateGlobal   = make(map[string]bool)
+	collectorFlagState     = make(map[string]*bool)
+	availableCollectors    = make([]string, 0)
 	forcedCollectors       = map[string]bool{} // collectors which have been explicitly enabled or disabled
 )
 
-func registerCollector(collector string, isDefaultEnabled bool, factory func(logger log.Logger) (Collector, error)) {
+func GetFlagDefaults() map[string]bool {
+	defaults := make(map[string]bool)
+	for k, v := range collectorFlagState {
+		defaults[k] = *v
+	}
+	return defaults
+}
+
+func registerCollector(collector string, isDefaultEnabled bool, factory func(config *NodeCollectorConfig, logger log.Logger) (Collector, error)) {
 	var helpDefaultState string
 	if isDefaultEnabled {
 		helpDefaultState = "enabled"
 	} else {
 		helpDefaultState = "disabled"
 	}
+	availableCollectors = append(availableCollectors, collector)
 
 	flagName := fmt.Sprintf("collector.%s", collector)
 	flagHelp := fmt.Sprintf("Enable the %s collector (default: %s).", collector, helpDefaultState)
 	defaultValue := fmt.Sprintf("%v", isDefaultEnabled)
 
 	flag := kingpin.Flag(flagName, flagHelp).Default(defaultValue).Action(collectorFlagAction(collector)).Bool()
-	collectorState[collector] = flag
+	collectorStateGlobal[collector] = isDefaultEnabled
+	collectorFlagState[collector] = flag
 
 	factories[collector] = factory
 }
@@ -84,9 +96,9 @@ type NodeCollector struct {
 // DisableDefaultCollectors sets the collector state to false for all collectors which
 // have not been explicitly enabled on the command line.
 func DisableDefaultCollectors() {
-	for c := range collectorState {
+	for c := range collectorFlagState {
 		if _, ok := forcedCollectors[c]; !ok {
-			*collectorState[c] = false
+			*collectorFlagState[c] = false
 		}
 	}
 }
@@ -104,29 +116,30 @@ func collectorFlagAction(collector string) func(ctx *kingpin.ParseContext) error
 }
 
 // NewNodeCollector creates a new NodeCollector.
-func NewNodeCollector(logger log.Logger, filters ...string) (*NodeCollector, error) {
+func NewNodeCollector(config *NodeCollectorConfig, logger log.Logger, filters ...string) (*NodeCollector, error) {
 	f := make(map[string]bool)
 	for _, filter := range filters {
-		enabled, exist := collectorState[filter]
+		enabled, exist := config.Collectors[filter]
 		if !exist {
 			return nil, fmt.Errorf("missing collector: %s", filter)
 		}
-		if !*enabled {
+		if !enabled {
 			return nil, fmt.Errorf("disabled collector: %s", filter)
 		}
 		f[filter] = true
 	}
 	collectors := make(map[string]Collector)
+
 	initiatedCollectorsMtx.Lock()
 	defer initiatedCollectorsMtx.Unlock()
-	for key, enabled := range collectorState {
-		if !*enabled || (len(f) > 0 && !f[key]) {
+	for key, enabled := range config.Collectors {
+		if !enabled || (len(f) > 0 && !f[key]) {
 			continue
 		}
-		if collector, ok := initiatedCollectors[key]; ok {
+		if collector, ok := initiatedCollectors[key]; ok && config.AllowCachingOfCollectors {
 			collectors[key] = collector
 		} else {
-			collector, err := factories[key](log.With(logger, "collector", key))
+			collector, err := factories[key](config, log.With(logger, "collector", key))
 			if err != nil {
 				return nil, err
 			}