Merge pull request prometheus-community#821 from mousavian/master

Adding Scheduled Tasks Collector

README.md

@@ -41,6 +41,7 @@ Name     | Description | Enabled by default
 [os](docs/collector.os.md) | OS metrics (memory, processes, users) | ✓
 [process](docs/collector.process.md) | Per-process metrics |
 [remote_fx](docs/collector.remote_fx.md) | RemoteFX protocol (RDP) metrics |
+[scheduled_task](docs/collector.scheduled_task.md) | Scheduled Tasks metrics |
 [service](docs/collector.service.md) | Service state metrics | ✓
 [smtp](docs/collector.smtp.md) | IIS SMTP Server |
 [system](docs/collector.system.md) | System calls | ✓
@@ -78,7 +79,7 @@ Flag     | Description | Default value
 `--telemetry.path` | URL path for surfacing collected metrics. | `/metrics`
 `--telemetry.max-requests` | Maximum number of concurrent requests. 0 to disable. | `5`
 `--collectors.enabled` | Comma-separated list of collectors to use. Use `[defaults]` as a placeholder which gets expanded containing all the collectors enabled by default." | `[defaults]`
-`--collectors.print` | If true, print available collectors and exit. | 
+`--collectors.print` | If true, print available collectors and exit. |
 `--scrape.timeout-margin` | Seconds to subtract from the timeout allowed by the client. Tune to allow for overhead or high loads. | `0.5`
 `--web.config.file` | A [web config][web_config] for setting up TLS and Auth | None
 
@@ -151,7 +152,7 @@ When there are multiple processes with the same name, WMI represents those after
 Using `[defaults]`  with `--collectors.enabled` argument which gets expanded with all default collectors.
 
     .\windows_exporter.exe --collectors.enabled "[defaults],process,container"
-    
+
 This enables the additional process and container collectors on top of the defaults.
 
 ### Using a configuration file

collector/scheduled_task.go

@@ -0,0 +1,314 @@
+//go:build windows
+// +build windows
+
+package collector
+
+import (
+	"fmt"
+	"regexp"
+	"runtime"
+	"strings"
+
+	ole "github.com/go-ole/go-ole"
+	"github.com/go-ole/go-ole/oleutil"
+	"github.com/prometheus-community/windows_exporter/log"
+	"github.com/prometheus/client_golang/prometheus"
+	"gopkg.in/alecthomas/kingpin.v2"
+)
+
+var (
+	taskWhitelist = kingpin.Flag(
+		"collector.scheduled_task.whitelist",
+		"Regexp of tasks to whitelist. Task path must both match whitelist and not match blacklist to be included.",
+	).Default(".+").String()
+	taskBlacklist = kingpin.Flag(
+		"collector.scheduled_task.blacklist",
+		"Regexp of tasks to blacklist. Task path must both match whitelist and not match blacklist to be included.",
+	).String()
+)
+
+type ScheduledTaskCollector struct {
+	LastResult *prometheus.Desc
+	MissedRuns *prometheus.Desc
+	State      *prometheus.Desc
+
+	taskWhitelistPattern *regexp.Regexp
+	taskBlacklistPattern *regexp.Regexp
+}
+
+// TaskState ...
+// https://docs.microsoft.com/en-us/windows/desktop/api/taskschd/ne-taskschd-task_state
+type TaskState uint
+
+type TaskResult uint
+
+const (
+	TASK_STATE_UNKNOWN TaskState = iota
+	TASK_STATE_DISABLED
+	TASK_STATE_QUEUED
+	TASK_STATE_READY
+	TASK_STATE_RUNNING
+	TASK_RESULT_SUCCESS TaskResult = 0x0
+)
+
+// RegisteredTask ...
+type ScheduledTask struct {
+	Name            string
+	Path            string
+	Enabled         bool
+	State           TaskState
+	MissedRunsCount float64
+	LastTaskResult  TaskResult
+}
+
+type ScheduledTasks []ScheduledTask
+
+func init() {
+	registerCollector("scheduled_task", NewScheduledTask)
+}
+
+// NewScheduledTask ...
+func NewScheduledTask() (Collector, error) {
+	const subsystem = "scheduled_task"
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	err := ole.CoInitializeEx(0, ole.COINIT_MULTITHREADED)
+	if err != nil {
+		code := err.(*ole.OleError).Code()
+		if code != ole.S_OK && code != S_FALSE {
+			return nil, err
+		}
+	}
+	defer ole.CoUninitialize()
+
+	return &ScheduledTaskCollector{
+		LastResult: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "last_result"),
+			"The result that was returned the last time the registered task was run",
+			[]string{"task"},
+			nil,
+		),
+
+		MissedRuns: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "missed_runs"),
+			"The number of times the registered task missed a scheduled run",
+			[]string{"task"},
+			nil,
+		),
+
+		State: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "state"),
+			"The current state of a scheduled task",
+			[]string{"task", "state"},
+			nil,
+		),
+
+		taskWhitelistPattern: regexp.MustCompile(fmt.Sprintf("^(?:%s)$", *taskWhitelist)),
+		taskBlacklistPattern: regexp.MustCompile(fmt.Sprintf("^(?:%s)$", *taskBlacklist)),
+	}, nil
+}
+
+func (c *ScheduledTaskCollector) Collect(ctx *ScrapeContext, ch chan<- prometheus.Metric) error {
+	if desc, err := c.collect(ch); err != nil {
+		log.Error("failed collecting user metrics:", desc, err)
+		return err
+	}
+
+	return nil
+}
+
+var TASK_STATES = []string{"disabled", "queued", "ready", "running", "unknown"}
+
+func (c *ScheduledTaskCollector) collect(ch chan<- prometheus.Metric) (*prometheus.Desc, error) {
+	scheduledTasks, err := getScheduledTasks()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, task := range scheduledTasks {
+		if c.taskBlacklistPattern.MatchString(task.Path) ||
+			!c.taskWhitelistPattern.MatchString(task.Path) {
+			continue
+		}
+
+		lastResult := 0.0
+		if task.LastTaskResult == TASK_RESULT_SUCCESS {
+			lastResult = 1.0
+		}
+
+		ch <- prometheus.MustNewConstMetric(
+			c.LastResult,
+			prometheus.GaugeValue,
+			lastResult,
+			task.Path,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			c.MissedRuns,
+			prometheus.GaugeValue,
+			task.MissedRunsCount,
+			task.Path,
+		)
+
+		for _, state := range TASK_STATES {
+			var stateValue float64
+
+			if strings.ToLower(task.State.String()) == state {
+				stateValue = 1.0
+			}
+
+			ch <- prometheus.MustNewConstMetric(
+				c.State,
+				prometheus.GaugeValue,
+				stateValue,
+				task.Path,
+				state,
+			)
+		}
+	}
+
+	return nil, nil
+}
+
+const SCHEDULED_TASK_PROGRAM_ID = "Schedule.Service.1"
+
+// S_FALSE is returned by CoInitialize if it was already called on this thread.
+const S_FALSE = 0x00000001
+
+func getScheduledTasks() (scheduledTasks ScheduledTasks, err error) {
+	schedClassID, err := ole.ClassIDFrom(SCHEDULED_TASK_PROGRAM_ID)
+	if err != nil {
+		return scheduledTasks, err
+	}
+
+	taskSchedulerObj, err := ole.CreateInstance(schedClassID, nil)
+	if err != nil || taskSchedulerObj == nil {
+		return scheduledTasks, err
+	}
+	defer taskSchedulerObj.Release()
+
+	taskServiceObj := taskSchedulerObj.MustQueryInterface(ole.IID_IDispatch)
+	_, err = oleutil.CallMethod(taskServiceObj, "Connect")
+	if err != nil {
+		return scheduledTasks, err
+	}
+	defer taskServiceObj.Release()
+
+	res, err := oleutil.CallMethod(taskServiceObj, "GetFolder", `\`)
+	if err != nil {
+		return scheduledTasks, err
+	}
+
+	rootFolderObj := res.ToIDispatch()
+	defer rootFolderObj.Release()
+
+	err = fetchTasksRecursively(rootFolderObj, &scheduledTasks)
+
+	return scheduledTasks, err
+}
+
+func fetchTasksInFolder(folder *ole.IDispatch, scheduledTasks *ScheduledTasks) error {
+	res, err := oleutil.CallMethod(folder, "GetTasks", 1)
+	if err != nil {
+		return err
+	}
+
+	tasks := res.ToIDispatch()
+	defer tasks.Release()
+
+	err = oleutil.ForEach(tasks, func(v *ole.VARIANT) error {
+		task := v.ToIDispatch()
+
+		parsedTask, err := parseTask(task)
+		if err != nil {
+			return err
+		}
+
+		*scheduledTasks = append(*scheduledTasks, parsedTask)
+
+		return nil
+	})
+
+	return err
+}
+
+func fetchTasksRecursively(folder *ole.IDispatch, scheduledTasks *ScheduledTasks) error {
+	if err := fetchTasksInFolder(folder, scheduledTasks); err != nil {
+		return err
+	}
+
+	res, err := oleutil.CallMethod(folder, "GetFolders", 1)
+	if err != nil {
+		return err
+	}
+
+	subFolders := res.ToIDispatch()
+	defer subFolders.Release()
+
+	err = oleutil.ForEach(subFolders, func(v *ole.VARIANT) error {
+		subFolder := v.ToIDispatch()
+		return fetchTasksRecursively(subFolder, scheduledTasks)
+	})
+
+	return err
+}
+
+func parseTask(task *ole.IDispatch) (scheduledTask ScheduledTask, err error) {
+	taskNameVar, err := oleutil.GetProperty(task, "Name")
+	if err != nil {
+		return scheduledTask, err
+	}
+
+	taskPathVar, err := oleutil.GetProperty(task, "Path")
+	if err != nil {
+		return scheduledTask, err
+	}
+
+	taskEnabledVar, err := oleutil.GetProperty(task, "Enabled")
+	if err != nil {
+		return scheduledTask, err
+	}
+
+	taskStateVar, err := oleutil.GetProperty(task, "State")
+	if err != nil {
+		return scheduledTask, err
+	}
+
+	taskNumberOfMissedRunsVar, err := oleutil.GetProperty(task, "NumberOfMissedRuns")
+	if err != nil {
+		return scheduledTask, err
+	}
+
+	taskLastTaskResultVar, err := oleutil.GetProperty(task, "LastTaskResult")
+	if err != nil {
+		return scheduledTask, err
+	}
+
+	scheduledTask.Name = taskNameVar.ToString()
+	scheduledTask.Path = strings.ReplaceAll(taskPathVar.ToString(), "\\", "/")
+	scheduledTask.Enabled = taskEnabledVar.Value().(bool)
+	scheduledTask.State = TaskState(taskStateVar.Val)
+	scheduledTask.MissedRunsCount = float64(taskNumberOfMissedRunsVar.Val)
+	scheduledTask.LastTaskResult = TaskResult(taskLastTaskResultVar.Val)
+
+	return scheduledTask, err
+}
+
+func (t TaskState) String() string {
+	switch t {
+	case TASK_STATE_UNKNOWN:
+		return "Unknown"
+	case TASK_STATE_DISABLED:
+		return "Disabled"
+	case TASK_STATE_QUEUED:
+		return "Queued"
+	case TASK_STATE_READY:
+		return "Ready"
+	case TASK_STATE_RUNNING:
+		return "Running"
+	default:
+		return ""
+	}
+}

collector/scheduled_task_test.go

@@ -0,0 +1,9 @@
+package collector
+
+import (
+	"testing"
+)
+
+func BenchmarkScheduledTaskCollector(b *testing.B) {
+	benchmarkCollector(b, "scheduled_task", NewScheduledTask)
+}

docs/README.md

@@ -28,6 +28,7 @@ This directory contains documentation of the collectors in the windows_exporter,
 - [`os`](collector.os.md)
 - [`process`](collector.process.md)
 - [`remote_fx`](collector.remote_fx.md)
+- [`scheduled_task`](collector.scheduled_task.md)
 - [`service`](collector.service.md)
 - [`smtp`](collector.smtp.md)
 - [`system`](collector.system.md)