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logging.go
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logging.go
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// +build !windows
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package logging
import (
"context"
"fmt"
"io"
"os"
"os/signal"
"golang.org/x/sys/unix"
)
// Config of the container logs
type Config struct {
ID string
Namespace string
Stdout io.Reader
Stderr io.Reader
}
// LoggerFunc is implemented by custom v2 logging binaries
type LoggerFunc func(context.Context, *Config, func() error) error
// Run the logging driver
func Run(fn LoggerFunc) {
ctx, cancel := context.WithCancel(context.Background())
config := &Config{
ID: os.Getenv("CONTAINER_ID"),
Namespace: os.Getenv("CONTAINER_NAMESPACE"),
Stdout: os.NewFile(3, "CONTAINER_STDOUT"),
Stderr: os.NewFile(4, "CONTAINER_STDERR"),
}
var (
s = make(chan os.Signal, 32)
errCh = make(chan error, 1)
wait = os.NewFile(5, "CONTAINER_WAIT")
)
signal.Notify(s, unix.SIGTERM)
go func() {
if err := fn(ctx, config, wait.Close); err != nil {
errCh <- err
}
errCh <- nil
}()
for {
select {
case <-s:
cancel()
case err := <-errCh:
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
os.Exit(0)
}
}
}