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package events
import (
"context"
"fmt"
"os"
"time"
"github.com/containers/podman/v3/pkg/util"
"github.com/containers/storage/pkg/lockfile"
"github.com/pkg/errors"
)
// EventLogFile is the structure for event writing to a logfile. It contains the eventer
// options and the event itself. Methods for reading and writing are also defined from it.
type EventLogFile struct {
options EventerOptions
}
// Writes to the log file
func (e EventLogFile) Write(ee Event) error {
// We need to lock events file
lock, err := lockfile.GetLockfile(e.options.LogFilePath + ".lock")
if err != nil {
return err
}
lock.Lock()
defer lock.Unlock()
f, err := os.OpenFile(e.options.LogFilePath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0700)
if err != nil {
return err
}
defer f.Close()
eventJSONString, err := ee.ToJSONString()
if err != nil {
return err
}
if _, err := f.WriteString(fmt.Sprintf("%s\n", eventJSONString)); err != nil {
return err
}
return nil
}
// Reads from the log file
func (e EventLogFile) Read(ctx context.Context, options ReadOptions) error {
defer close(options.EventChannel)
filterMap, err := generateEventFilters(options.Filters, options.Since, options.Until)
if err != nil {
return errors.Wrapf(err, "failed to parse event filters")
}
t, err := e.getTail(options)
if err != nil {
return err
}
if len(options.Until) > 0 {
untilTime, err := util.ParseInputTime(options.Until, false)
if err != nil {
return err
}
go func() {
time.Sleep(time.Until(untilTime))
t.Stop()
}()
}
funcDone := make(chan bool)
copy := true
go func() {
select {
case <-funcDone:
// Do nothing
case <-ctx.Done():
copy = false
t.Kill(errors.New("hangup by client"))
}
}()
for line := range t.Lines {
select {
case <-ctx.Done():
// the consumer has cancelled
return nil
default:
// fallthrough
}
event, err := newEventFromJSONString(line.Text)
if err != nil {
return err
}
switch event.Type {
case Image, Volume, Pod, System, Container, Network:
// no-op
default:
return errors.Errorf("event type %s is not valid in %s", event.Type.String(), e.options.LogFilePath)
}
if copy && applyFilters(event, filterMap) {
options.EventChannel <- event
}
}
funcDone <- true
return nil
}
// String returns a string representation of the logger
func (e EventLogFile) String() string {
return LogFile.String()
}
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