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vklog.go
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vklog.go
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package strive
import (
"bytes"
"io"
"os"
"os/exec"
"strings"
"unicode"
backend "github.com/vektra/go-dockerclient"
"github.com/vektra/log"
)
type VKLogger struct {
logger log.Logger
logpath string
}
var _ = Logger(&VKLogger{})
func NewVKLogger() *VKLogger {
return &VKLogger{
logger: log.Connect(),
logpath: log.LogPath(),
}
}
type vkStream struct {
logger log.Logger
name string
taskId string
buf bytes.Buffer
}
var _ = io.WriteCloser(&vkStream{})
var NL = []byte{'\n'}
func (s *vkStream) Write(line []byte) (int, error) {
total := len(line)
for {
idx := bytes.Index(line, NL)
if idx == -1 {
s.buf.Write(line)
return total, nil
}
portion := string(line[0 : idx+1])
var full string
if s.buf.Len() == 0 {
full = portion
} else {
full = s.buf.String() + portion
s.buf.Reset()
}
full = strings.TrimRightFunc(full, unicode.IsSpace)
if len(full) > 0 {
m := log.Log()
m.Add("task", s.taskId)
m.Add(s.name, full)
err := s.logger.Write(m)
if err != nil {
return 0, err
}
}
line = line[idx+1:]
}
return len(line), nil
}
func (s *vkStream) Close() error {
return nil
}
func (v *VKLogger) SetupStream(name string, task *Task) (io.WriteCloser, error) {
return &vkStream{logger: v.logger, name: name, taskId: task.GetTaskId()}, nil
}
type structuredStream struct {
name string
read *os.File
logger log.Logger
}
func (ss *structuredStream) process() {
kvStream := &log.SwitchStream{
Input: ss.read,
Out: ss,
}
kvStream.Parse()
}
func (ss *structuredStream) Read(m *log.Message) error {
return ss.logger.Write(m)
}
func (v *VKLogger) InjectLog(cmd *exec.Cmd, task *Task) error {
r, w, err := os.Pipe()
if err != nil {
return err
}
ss := &structuredStream{"logs", r, v.logger}
go ss.process()
cmd.ExtraFiles = []*os.File{w}
cmd.Env = append(cmd.Env, "LOG_FD=3")
return nil
}
const cInContainerPath = "/tmp/vklog.sock"
func (v *VKLogger) InjectDocker(
cfg *backend.Config,
hc *backend.HostConfig,
task *Task,
) error {
val, ok := task.ConfigBoolGet("vklog.disable")
if ok && val {
return nil
}
cfg.Env = append(cfg.Env, "LOG_PATH="+cInContainerPath)
hc.Binds = append(hc.Binds, v.logpath+":"+cInContainerPath)
return nil
}