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runner.go
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/
runner.go
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package logging
import (
"bytes"
"io"
"os/exec"
"syscall"
"time"
"code.cloudfoundry.org/commandrunner"
"code.cloudfoundry.org/lager"
)
type Runner struct {
commandrunner.CommandRunner
Logger lager.Logger
}
func (runner *Runner) Run(cmd *exec.Cmd) error {
stdout := new(bytes.Buffer)
stderr := new(bytes.Buffer)
if cmd.Stdout == nil {
cmd.Stdout = stdout
} else {
cmd.Stdout = io.MultiWriter(cmd.Stdout, stdout)
}
if cmd.Stderr == nil {
cmd.Stderr = stderr
} else {
cmd.Stderr = io.MultiWriter(cmd.Stderr, stderr)
}
rLog := runner.Logger.Session("command", lager.Data{
"argv": cmd.Args,
})
started := time.Now()
rLog.Debug("starting")
err := runner.CommandRunner.Run(cmd)
data := lager.Data{
"took": time.Since(started).String(),
}
state := cmd.ProcessState
if state != nil {
data["exit-status"] = state.Sys().(syscall.WaitStatus).ExitStatus()
}
if err != nil {
data["stdout"] = stdout.String()
data["stderr"] = stderr.String()
rLog.Error("failed", err, data)
} else {
rLog.Debug("succeeded", data)
}
return err
}