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|
package system
import (
"bytes"
"context"
"fmt"
"io"
"os/exec"
"time"
"github.com/goss-org/goss/util"
)
type Command interface {
Command() string
Exists() (bool, error)
ExitStatus() (int, error)
Stdout() (io.Reader, error)
Stderr() (io.Reader, error)
}
type DefCommand struct {
Ctx context.Context
command string
exitStatus int
stdout io.Reader
stderr io.Reader
loaded bool
Timeout int
err error
}
func NewDefCommand(ctx context.Context, command string, system *System, config util.Config) Command {
return &DefCommand{
Ctx: ctx,
command: command,
Timeout: config.TimeOutMilliSeconds(),
}
}
func (c *DefCommand) setup() error {
if c.loaded {
return c.err
}
c.loaded = true
cmd := commandWrapper(c.command)
err := runCommand(cmd, c.Timeout)
// We don't care about ExitError since it's covered by status
if _, ok := err.(*exec.ExitError); !ok {
c.err = err
}
c.exitStatus = cmd.Status
stdoutB := cmd.Stdout.Bytes()
stderrB := cmd.Stderr.Bytes()
id := c.Ctx.Value("id")
logBytes(stdoutB, fmt.Sprintf("[Command][%s][stdout] ", id))
logBytes(stderrB, fmt.Sprintf("[Command][%s][stderr] ", id))
c.stdout = bytes.NewReader(stdoutB)
c.stderr = bytes.NewReader(stderrB)
return c.err
}
func (c *DefCommand) Command() string {
return c.command
}
func (c *DefCommand) ExitStatus() (int, error) {
err := c.setup()
return c.exitStatus, err
}
func (c *DefCommand) Stdout() (io.Reader, error) {
err := c.setup()
return c.stdout, err
}
func (c *DefCommand) Stderr() (io.Reader, error) {
err := c.setup()
return c.stderr, err
}
// Stub out
func (c *DefCommand) Exists() (bool, error) {
return false, nil
}
func runCommand(cmd *util.Command, timeout int) error {
c1 := make(chan bool, 1)
e1 := make(chan error, 1)
timeoutD := time.Duration(timeout) * time.Millisecond
go func() {
err := cmd.Run()
if err != nil {
e1 <- err
}
c1 <- true
}()
select {
case <-c1:
return nil
case err := <-e1:
return err
case <-time.After(timeoutD):
return fmt.Errorf("Command execution timed out (%s)", timeoutD)
}
}
|
