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package libpod
import (
"context"
"fmt"
"sync"
"github.com/containers/podman/v3/libpod/events"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// newEventer returns an eventer that can be used to read/write events
func (r *Runtime) newEventer() (events.Eventer, error) {
options := events.EventerOptions{
EventerType: r.config.Engine.EventsLogger,
LogFilePath: r.config.Engine.EventsLogFilePath,
}
return events.NewEventer(options)
}
// newContainerEvent creates a new event based on a container
func (c *Container) newContainerEvent(status events.Status) {
e := events.NewEvent(status)
e.ID = c.ID()
e.Name = c.Name()
e.Image = c.config.RootfsImageName
e.Type = events.Container
e.Details = events.Details{
ID: e.ID,
Attributes: c.Labels(),
}
if err := c.runtime.eventer.Write(e); err != nil {
logrus.Errorf("Unable to write pod event: %q", err)
}
}
// newContainerExitedEvent creates a new event for a container's death
func (c *Container) newContainerExitedEvent(exitCode int32) {
e := events.NewEvent(events.Exited)
e.ID = c.ID()
e.Name = c.Name()
e.Image = c.config.RootfsImageName
e.Type = events.Container
e.ContainerExitCode = int(exitCode)
if err := c.runtime.eventer.Write(e); err != nil {
logrus.Errorf("Unable to write container exited event: %q", err)
}
}
// newExecDiedEvent creates a new event for an exec session's death
func (c *Container) newExecDiedEvent(sessionID string, exitCode int) {
e := events.NewEvent(events.ExecDied)
e.ID = c.ID()
e.Name = c.Name()
e.Image = c.config.RootfsImageName
e.Type = events.Container
e.ContainerExitCode = exitCode
e.Attributes = make(map[string]string)
e.Attributes["execID"] = sessionID
if err := c.runtime.eventer.Write(e); err != nil {
logrus.Errorf("Unable to write exec died event: %q", err)
}
}
// netNetworkEvent creates a new event based on a network connect/disconnect
func (c *Container) newNetworkEvent(status events.Status, netName string) {
e := events.NewEvent(status)
e.ID = c.ID()
e.Name = c.Name()
e.Type = events.Network
e.Network = netName
if err := c.runtime.eventer.Write(e); err != nil {
logrus.Errorf("Unable to write pod event: %q", err)
}
}
// newPodEvent creates a new event for a libpod pod
func (p *Pod) newPodEvent(status events.Status) {
e := events.NewEvent(status)
e.ID = p.ID()
e.Name = p.Name()
e.Type = events.Pod
if err := p.runtime.eventer.Write(e); err != nil {
logrus.Errorf("Unable to write pod event: %q", err)
}
}
// newSystemEvent creates a new event for libpod as a whole.
func (r *Runtime) newSystemEvent(status events.Status) {
e := events.NewEvent(status)
e.Type = events.System
if err := r.eventer.Write(e); err != nil {
logrus.Errorf("Unable to write system event: %q", err)
}
}
// newVolumeEvent creates a new event for a libpod volume
func (v *Volume) newVolumeEvent(status events.Status) {
e := events.NewEvent(status)
e.Name = v.Name()
e.Type = events.Volume
if err := v.runtime.eventer.Write(e); err != nil {
logrus.Errorf("Unable to write volume event: %q", err)
}
}
// Events is a wrapper function for everyone to begin tailing the events log
// with options
func (r *Runtime) Events(ctx context.Context, options events.ReadOptions) error {
eventer, err := r.newEventer()
if err != nil {
return err
}
return eventer.Read(ctx, options)
}
// GetEvents reads the event log and returns events based on input filters
func (r *Runtime) GetEvents(ctx context.Context, filters []string) ([]*events.Event, error) {
eventChannel := make(chan *events.Event)
options := events.ReadOptions{
EventChannel: eventChannel,
Filters: filters,
FromStart: true,
Stream: false,
}
eventer, err := r.newEventer()
if err != nil {
return nil, err
}
logEvents := make([]*events.Event, 0, len(eventChannel))
readLock := sync.Mutex{}
readLock.Lock()
go func() {
for e := range eventChannel {
logEvents = append(logEvents, e)
}
readLock.Unlock()
}()
readErr := eventer.Read(ctx, options)
readLock.Lock() // Wait for the events to be consumed.
return logEvents, readErr
}
// GetLastContainerEvent takes a container name or ID and an event status and returns
// the last occurrence of the container event
func (r *Runtime) GetLastContainerEvent(ctx context.Context, nameOrID string, containerEvent events.Status) (*events.Event, error) {
// check to make sure the event.Status is valid
if _, err := events.StringToStatus(containerEvent.String()); err != nil {
return nil, err
}
filters := []string{
fmt.Sprintf("container=%s", nameOrID),
fmt.Sprintf("event=%s", containerEvent),
"type=container",
}
containerEvents, err := r.GetEvents(ctx, filters)
if err != nil {
return nil, err
}
if len(containerEvents) < 1 {
return nil, errors.Wrapf(events.ErrEventNotFound, "%s not found", containerEvent.String())
}
// return the last element in the slice
return containerEvents[len(containerEvents)-1], nil
}
// GetExecDiedEvent takes a container name or ID, exec session ID, and returns
// that exec session's Died event (if it has already occurred).
func (r *Runtime) GetExecDiedEvent(ctx context.Context, nameOrID, execSessionID string) (*events.Event, error) {
filters := []string{
fmt.Sprintf("container=%s", nameOrID),
"event=exec_died",
"type=container",
fmt.Sprintf("label=execID=%s", execSessionID),
}
containerEvents, err := r.GetEvents(ctx, filters)
if err != nil {
return nil, err
}
// There *should* only be one event maximum.
// But... just in case... let's not blow up if there's more than one.
if len(containerEvents) < 1 {
return nil, errors.Wrapf(events.ErrEventNotFound, "exec died event for session %s (container %s) not found", execSessionID, nameOrID)
}
return containerEvents[len(containerEvents)-1], nil
}
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