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|
package run
import (
"bufio"
"context"
"io"
"os/exec"
"strings"
"sync"
"time"
"github.com/mimecast/dtail/internal/io/line"
"github.com/mimecast/dtail/internal/io/logger"
)
// Run is for execute a command.
type Run struct {
commandPath string
args []string
cmd *exec.Cmd
}
// New returns a new command runner.
func New(commandPath string, args []string) Run {
return Run{
commandPath: commandPath,
args: args,
}
}
// Start running the command.
func (r Run) Start(ctx context.Context, lines chan<- line.Line) (pid int, ec int, err error) {
done := make(chan struct{})
defer close(done)
ec = -1
pid = -1
if len(r.args) > 0 {
logger.Debug(r.commandPath, strings.Join(r.args, " "))
r.cmd = exec.CommandContext(ctx, r.commandPath, strings.Join(r.args, " "))
} else {
logger.Debug(r.commandPath)
r.cmd = exec.CommandContext(ctx, r.commandPath)
}
stdoutPipe, myErr := r.cmd.StdoutPipe()
if err != nil {
err = myErr
return
}
stderrPipe, myErr := r.cmd.StderrPipe()
if myErr != nil {
err = myErr
return
}
if myErr := r.cmd.Start(); err != nil {
err = myErr
return
}
pid = r.cmd.Process.Pid
ec = 0
var wg sync.WaitGroup
wg.Add(2)
go r.pipeToLines(done, &wg, pid, stdoutPipe, "STDOUT", lines)
go r.pipeToLines(done, &wg, pid, stderrPipe, "STDERR", lines)
if err = r.cmd.Wait(); err != nil {
if exitError, ok := err.(*exec.ExitError); ok {
ec = exitError.ExitCode()
}
}
return
}
func (r Run) pipeToLines(done chan struct{}, wg *sync.WaitGroup, pid int, reader io.Reader, what string, lines chan<- line.Line) {
defer wg.Done()
bufReader := bufio.NewReader(reader)
for {
lineStr, err := bufReader.ReadString('\n')
for err == nil {
lines <- line.Line{
Content: []byte(lineStr),
Count: uint64(pid),
TransmittedPerc: 100,
SourceID: what,
}
lineStr, err = bufReader.ReadString('\n')
}
select {
case <-done:
return
default:
}
time.Sleep(time.Millisecond * 10)
}
}
|
