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kubernetes_events.go
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kubernetes_events.go
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// Package kubernetes_events implements the loki.source.kubernetes_events
// component.
package kubernetes_events //nolint:golint
import (
"context"
"fmt"
"os"
"path/filepath"
"reflect"
"sync"
"time"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/grafana/agent/component"
"github.com/grafana/agent/component/common/kubernetes"
"github.com/grafana/agent/component/common/loki"
"github.com/grafana/agent/component/common/loki/positions"
"github.com/grafana/agent/pkg/runner"
"github.com/oklog/run"
"k8s.io/client-go/rest"
)
// Generous timeout period for configuring informers
const informerSyncTimeout = 10 * time.Second
func init() {
component.Register(component.Registration{
Name: "loki.source.kubernetes_events",
Args: Arguments{},
Build: func(opts component.Options, args component.Arguments) (component.Component, error) {
return New(opts, args.(Arguments))
},
})
}
// Arguments holds values which are used to configure the
// loki.source.kubernetes_events component.
type Arguments struct {
ForwardTo []loki.LogsReceiver `river:"forward_to,attr"`
JobName string `river:"job_name,attr,optional"`
Namespaces []string `river:"namespaces,attr,optional"`
LogFormat string `river:"log_format,attr,optional"`
// Client settings to connect to Kubernetes.
Client kubernetes.ClientArguments `river:"client,block,optional"`
}
// DefaultArguments holds default settings for loki.source.kubernetes_events.
var DefaultArguments = Arguments{
JobName: "loki.source.kubernetes_events",
LogFormat: logFormatFmt,
Client: kubernetes.DefaultClientArguments,
}
// SetToDefault implements river.Defaulter.
func (args *Arguments) SetToDefault() {
*args = DefaultArguments
}
// Validate implements river.Validator.
func (args *Arguments) Validate() error {
if args.JobName == "" {
return fmt.Errorf("job_name must not be an empty string")
}
if args.LogFormat != logFormatFmt && args.LogFormat != logFormatJson {
return fmt.Errorf("supported values of log_format are %s and %s", logFormatFmt, logFormatJson)
}
return nil
}
// Component implements the loki.source.kubernetes_events component, which
// watches events from Kubernetes and forwards received events to other Loki
// components.
type Component struct {
log log.Logger
opts component.Options
positions positions.Positions
handler loki.LogsReceiver
runner *runner.Runner[eventControllerTask]
newTasksCh chan struct{}
mut sync.Mutex
args Arguments
restConfig *rest.Config
tasksMut sync.RWMutex
tasks []eventControllerTask
receiversMut sync.RWMutex
receivers []loki.LogsReceiver
}
var (
_ component.Component = (*Component)(nil)
_ component.DebugComponent = (*Component)(nil)
)
// New creates a new loki.source.kubernetes_events component.
func New(o component.Options, args Arguments) (*Component, error) {
err := os.MkdirAll(o.DataPath, 0750)
if err != nil && !os.IsExist(err) {
return nil, err
}
positionsFile, err := positions.New(o.Logger, positions.Config{
SyncPeriod: 10 * time.Second,
PositionsFile: filepath.Join(o.DataPath, "positions.yml"),
})
if err != nil {
return nil, err
}
c := &Component{
log: o.Logger,
opts: o,
positions: positionsFile,
handler: loki.NewLogsReceiver(),
runner: runner.New(func(t eventControllerTask) runner.Worker {
return newEventController(t)
}),
newTasksCh: make(chan struct{}, 1),
}
if err := c.Update(args); err != nil {
return nil, err
}
return c, nil
}
// Run implements component.Component.
func (c *Component) Run(ctx context.Context) error {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
defer c.positions.Stop()
defer c.runner.Stop()
var rg run.Group
// Runner to apply tasks.
rg.Add(func() error {
for {
select {
case <-ctx.Done():
return nil
case <-c.newTasksCh:
c.tasksMut.RLock()
tasks := c.tasks
c.tasksMut.RUnlock()
if err := c.runner.ApplyTasks(ctx, tasks); err != nil {
level.Error(c.log).Log("msg", "failed to apply event watchers", "err", err)
}
}
}
}, func(_ error) {
cancel()
})
// Runner to forward received logs.
rg.Add(func() error {
for {
select {
case <-ctx.Done():
return nil
case entry := <-c.handler.Chan():
c.receiversMut.RLock()
receivers := c.receivers
c.receiversMut.RUnlock()
for _, receiver := range receivers {
receiver.Chan() <- entry
}
}
}
}, func(_ error) {
cancel()
})
return rg.Run()
}
// Update implements component.Component.
func (c *Component) Update(args component.Arguments) error {
c.mut.Lock()
defer c.mut.Unlock()
newArgs := args.(Arguments)
c.receiversMut.Lock()
c.receivers = newArgs.ForwardTo
c.receiversMut.Unlock()
restConfig := c.restConfig
// Create a new restConfig if we don't have one or if our arguments changed.
if restConfig == nil || !reflect.DeepEqual(c.args.Client, newArgs.Client) {
var err error
restConfig, err = newArgs.Client.BuildRESTConfig(c.log)
if err != nil {
return fmt.Errorf("building Kubernetes client config: %w", err)
}
}
// Create a task for each defined namespace.
var newTasks []eventControllerTask
for _, namespace := range getNamespaces(newArgs) {
newTasks = append(newTasks, eventControllerTask{
Log: c.log,
Config: restConfig,
JobName: newArgs.JobName,
InstanceName: c.opts.ID,
Namespace: namespace,
Receiver: c.handler,
Positions: c.positions,
LogFormat: newArgs.LogFormat,
})
}
c.tasksMut.Lock()
c.tasks = newTasks
c.tasksMut.Unlock()
select {
case c.newTasksCh <- struct{}{}:
default:
// no-op: task reload already queued.
}
c.args = newArgs
return nil
}
// getNamespaces gets a list of namespaces to watch from the arguments. If the
// list of namespaces is empty, returns a slice to watch all namespaces.
func getNamespaces(args Arguments) []string {
if len(args.Namespaces) == 0 {
return []string{""} // Empty string means to watch all namespaces
}
return args.Namespaces
}
// DebugInfo implements [component.DebugComponent].
func (c *Component) DebugInfo() interface{} {
type Info struct {
Controllers []controllerInfo `river:"event_controller,block,optional"`
}
var info Info
for _, worker := range c.runner.Workers() {
info.Controllers = append(info.Controllers, worker.(*eventController).DebugInfo())
}
return info
}