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events.go
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events.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package client
import (
"context"
"errors"
"fmt"
"io"
"log"
"sync"
"time"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
machineapi "github.com/siderolabs/talos/pkg/machinery/api/machine"
"github.com/siderolabs/talos/pkg/machinery/proto"
)
// ErrEventNotSupported is returned from the event decoder when we encounter an unknown event.
var ErrEventNotSupported = errors.New("event is not supported")
// EventsOptionFunc defines the options for the Events API.
type EventsOptionFunc func(opts *machineapi.EventsRequest)
// WithTailEvents sets up Events API to return specified number of past events.
//
// If number is negative, all the available past events are returned.
func WithTailEvents(number int32) EventsOptionFunc {
return func(opts *machineapi.EventsRequest) {
opts.TailEvents = number
}
}
// WithTailID sets up Events API to return events with ID > TailID.
func WithTailID(id string) EventsOptionFunc {
return func(opts *machineapi.EventsRequest) {
opts.TailId = id
}
}
// WithTailDuration sets up Watcher to return events with timestamp >= (now - tailDuration).
func WithTailDuration(dur time.Duration) EventsOptionFunc {
return func(opts *machineapi.EventsRequest) {
opts.TailSeconds = int32(dur / time.Second)
}
}
// WithActorID sets up Watcher to return events with the specified actor ID.
func WithActorID(actorID string) EventsOptionFunc {
return func(opts *machineapi.EventsRequest) {
opts.WithActorId = actorID
}
}
// Events implements the proto.OSClient interface.
func (c *Client) Events(ctx context.Context, opts ...EventsOptionFunc) (stream machineapi.MachineService_EventsClient, err error) {
var req machineapi.EventsRequest
for _, opt := range opts {
opt(&req)
}
return c.MachineClient.Events(ctx, &req)
}
// Event as received from the API.
type Event struct {
Node string
TypeURL string
ID string
ActorID string
Payload proto.Message
}
// EventsWatch wraps Events by providing more simple interface.
//
//nolint:gocyclo
func (c *Client) EventsWatch(ctx context.Context, watchFunc func(<-chan Event), opts ...EventsOptionFunc) error {
stream, err := c.Events(ctx, opts...)
if err != nil {
return fmt.Errorf("error fetching events: %s", err)
}
if err = stream.CloseSend(); err != nil {
return err
}
defaultNode := RemotePeer(stream.Context()) //nolint:contextcheck
var wg sync.WaitGroup
defer wg.Wait()
ch := make(chan Event)
defer close(ch)
wg.Add(1)
go func() {
defer wg.Done()
watchFunc(ch)
}()
for {
event, err := stream.Recv()
if err != nil {
if err == io.EOF || StatusCode(err) == codes.Canceled {
return nil
}
return fmt.Errorf("failed to watch events: %w", err)
}
ev, err := UnmarshalEvent(event)
if err != nil {
continue
}
if ev.Node == "" {
ev.Node = defaultNode
}
select {
case ch <- *ev:
case <-ctx.Done():
return nil
}
}
}
// EventResult is the result of an event watch, containing either an Event or an error.
type EventResult struct {
// Event is the event that was received.
Event Event
// Err is the error that occurred.
Error error
}
// EventsWatchV2 watches events of a single node and wraps the Events by providing a simpler interface.
// It blocks until the first (empty) event is received, then spawns a goroutine that sends events to the given channel.
// EventResult objects sent into the channel contain either the errors or the received events.
//
//nolint:gocyclo
func (c *Client) EventsWatchV2(ctx context.Context, ch chan<- EventResult, opts ...EventsOptionFunc) error {
ctx, cancel := context.WithCancel(ctx)
stream, err := c.Events(ctx, opts...)
if err != nil {
cancel()
return fmt.Errorf("error fetching events: %w", err)
}
if err = stream.CloseSend(); err != nil {
cancel()
return err
}
defaultNode := RemotePeer(stream.Context())
// receive first (empty) watch event
_, err = stream.Recv()
if err != nil {
cancel()
return fmt.Errorf("error while watching events: %w", err)
}
go func() {
defer cancel()
err = func() error {
for {
event, eventErr := stream.Recv()
if eventErr != nil {
return eventErr
}
if event.GetMetadata().GetError() != "" {
var mdErr error
if event.GetMetadata().GetStatus() != nil {
mdErr = status.FromProto(event.GetMetadata().GetStatus()).Err()
} else {
mdErr = errors.New(event.GetMetadata().GetError())
}
return fmt.Errorf("%s: %w", event.GetMetadata().GetHostname(), mdErr)
}
ev, eventErr := UnmarshalEvent(event)
if eventErr != nil {
return eventErr
}
if ev == nil {
continue
}
if ev.Node == "" {
ev.Node = defaultNode
}
select {
case ch <- EventResult{Event: *ev}:
case <-ctx.Done():
return ctx.Err()
}
}
}()
if err != nil {
select {
case ch <- EventResult{Error: err}:
case <-ctx.Done():
}
}
}()
return nil
}
// UnmarshalEvent decodes the event coming from the gRPC stream from any to the exact type.
func UnmarshalEvent(event *machineapi.Event) (*Event, error) {
typeURL := event.GetData().GetTypeUrl()
var msg proto.Message
for _, eventType := range []proto.Message{
&machineapi.SequenceEvent{},
&machineapi.PhaseEvent{},
&machineapi.TaskEvent{},
&machineapi.ServiceStateEvent{},
&machineapi.ConfigLoadErrorEvent{},
&machineapi.ConfigValidationErrorEvent{},
&machineapi.AddressEvent{},
&machineapi.MachineStatusEvent{},
} {
if typeURL == "talos/runtime/"+string(eventType.ProtoReflect().Descriptor().FullName()) {
msg = eventType
break
}
}
if msg == nil {
// We haven't implemented the handling of this event yet.
return nil, ErrEventNotSupported
}
if err := proto.Unmarshal(event.GetData().GetValue(), msg); err != nil {
log.Printf("failed to unmarshal message: %v", err)
return nil, err
}
ev := Event{
TypeURL: typeURL,
ID: event.Id,
Payload: msg,
ActorID: event.ActorId,
}
if event.Metadata != nil {
ev.Node = event.Metadata.Hostname
}
return &ev, nil
}