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manager.go
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manager.go
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package beater
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"time"
"github.com/elastic/beats/libbeat/beat"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/processors"
"github.com/elastic/beats/heartbeat/monitors"
"github.com/elastic/beats/heartbeat/scheduler"
"github.com/elastic/beats/heartbeat/scheduler/schedule"
"github.com/elastic/beats/heartbeat/watcher"
)
type monitorManager struct {
monitors []monitor
jobControl jobControl
}
type monitor struct {
manager *monitorManager
watcher watcher.Watch
name string
uniqueName string
factory monitors.Factory
config *common.Config
active map[string]monitorTask
pipeline beat.Pipeline
}
type monitorTask struct {
job monitors.Job
cancel jobCanceller
config monitorTaskConfig
}
type monitorTaskConfig struct {
Name string `config:"name"`
Type string `config:"type"`
Schedule *schedule.Schedule `config:"schedule" validate:"required"`
// Fields and tags to add to monitor.
EventMetadata common.EventMetadata `config:",inline"`
Processors processors.PluginConfig `config:"processors"`
}
type jobControl interface {
Add(sched scheduler.Schedule, name string, f scheduler.TaskFunc) func() error
}
type jobCanceller func() error
var defaultFilePollInterval = 5 * time.Second
const defaultEventType = "monitor"
func newMonitorManager(
pipeline beat.Pipeline,
jobControl jobControl,
registry *monitors.Registrar,
configs []*common.Config,
) (*monitorManager, error) {
type watchConfig struct {
Path string `config:"watch.poll_file.path"`
Poll time.Duration `config:"watch.poll_file.interval" validate:"min=1"`
}
defaultWatchConfig := watchConfig{
Poll: defaultFilePollInterval,
}
m := &monitorManager{
jobControl: jobControl,
}
if len(configs) == 0 {
return nil, errors.New("no monitor configured")
}
// check monitors exist
for _, config := range configs {
plugin := struct {
Type string `config:"type" validate:"required"`
Enabled bool `config:"enabled"`
}{
Enabled: true,
}
if err := config.Unpack(&plugin); err != nil {
return nil, err
}
if !plugin.Enabled {
continue
}
info, found := registry.Query(plugin.Type)
if !found {
return nil, fmt.Errorf("Monitor type '%v' does not exist", plugin.Type)
}
logp.Info("Select (%v) monitor %v", info.Type, info.Name)
factory := registry.GetFactory(plugin.Type)
if factory == nil {
return nil, fmt.Errorf("Found non-runnable monitor %v", plugin.Type)
}
m.monitors = append(m.monitors, monitor{
manager: m,
name: info.Name,
factory: factory,
config: config,
active: map[string]monitorTask{},
pipeline: pipeline,
})
}
// load watcher configs
watchConfigs := make([]watchConfig, len(m.monitors))
for i, monitor := range m.monitors {
watchConfigs[i] = defaultWatchConfig
if err := monitor.config.Unpack(&watchConfigs[i]); err != nil {
return nil, err
}
}
// load initial monitors
for _, monitor := range m.monitors {
err := monitor.Update([]*common.Config{monitor.config})
if err != nil {
logp.Err("failed to load monitor tasks: %v", err)
}
}
// start monitor resource watchers if configured (will drop registered monitoring tasks and install new one if resource is available)
for i := range m.monitors {
monitor := &m.monitors[i]
path := watchConfigs[i].Path
if path == "" {
continue
}
poll := watchConfigs[i].Poll
monitor.watcher, _ = watcher.NewFilePoller(path, poll, createWatchUpdater(monitor))
}
return m, nil
}
func (m *monitorManager) Stop() {
for _, m := range m.monitors {
m.Close()
}
}
func (m *monitor) Update(configs []*common.Config) error {
all := map[string]monitorTask{}
for i, upd := range configs {
config, err := common.MergeConfigs(m.config, upd)
if err != nil {
logp.Err("Failed merging monitor config with updates: %v", err)
return err
}
shared := monitorTaskConfig{}
if err := config.Unpack(&shared); err != nil {
logp.Err("Failed parsing job schedule: ", err)
return err
}
jobs, err := m.factory(config)
if err != nil {
err = fmt.Errorf("%v when initializing monitor %v(%v)", err, m.name, i)
return err
}
for _, job := range jobs {
all[job.Name()] = monitorTask{
job: job,
config: shared,
}
}
}
// stop all active jobs
for _, job := range m.active {
job.cancel()
}
m.active = map[string]monitorTask{}
// start new and reconfigured tasks
for id, t := range all {
processors, err := processors.New(t.config.Processors)
if err != nil {
logp.Critical("Fail to load monitor processors: %v", err)
continue
}
// create connection per monitorTask
client, err := m.pipeline.ConnectWith(beat.ClientConfig{
EventMetadata: t.config.EventMetadata,
Processor: processors,
})
if err != nil {
logp.Critical("Fail to connect job '%v' to publisher pipeline: %v", id, err)
continue
}
job := t.createJob(client)
jobCancel := m.manager.jobControl.Add(t.config.Schedule, id, job)
t.cancel = func() error {
client.Close()
return jobCancel()
}
m.active[id] = t
}
return nil
}
func (m *monitor) Close() {
for _, mt := range m.active {
mt.cancel()
}
}
func createWatchUpdater(monitor *monitor) func(content []byte) {
return func(content []byte) {
defer logp.Recover("Failed applying monitor watch")
// read multiple json objects from content
dec := json.NewDecoder(bytes.NewBuffer(content))
var configs []*common.Config
for dec.More() {
var obj map[string]interface{}
err := dec.Decode(&obj)
if err != nil {
logp.Err("Failed parsing json object: %v", err)
return
}
logp.Info("load watch object: %v", obj)
cfg, err := common.NewConfigFrom(obj)
if err != nil {
logp.Err("Failed normalizing json input: %v", err)
return
}
configs = append(configs, cfg)
}
// apply read configurations
if err := monitor.Update(configs); err != nil {
logp.Err("Failed applying configuration: %v", err)
}
}
}
func (m *monitorTask) createJob(client beat.Client) scheduler.TaskFunc {
name := m.config.Name
if name == "" {
name = m.config.Type
}
meta := common.MapStr{
"monitor": common.MapStr{
"name": name,
"type": m.config.Type,
},
}
return m.prepareSchedulerJob(client, meta, m.job.Run)
}
func (m *monitorTask) prepareSchedulerJob(client beat.Client, meta common.MapStr, run monitors.JobRunner) scheduler.TaskFunc {
return func() []scheduler.TaskFunc {
event, next, err := run()
if err != nil {
logp.Err("Job %v failed with: ", err)
}
if event.Fields != nil {
event.Fields.DeepUpdate(meta)
if _, exists := event.Fields["type"]; !exists {
event.Fields["type"] = defaultEventType
}
client.Publish(event)
}
if len(next) == 0 {
return nil
}
cont := make([]scheduler.TaskFunc, len(next))
for i, n := range next {
cont[i] = m.prepareSchedulerJob(client, meta, n)
}
return cont
}
}