在高层次上,我想要实现以下目标。每个框都是一个正在运行的程序,从STDIN读取并写入STDOUT。我想编写一个golang程序来设置并运行它,以便所有生产/消费都是并行进行的。我考虑使用io.Pipe、通道和os.Exec等。
+-----------+
| PROG-1 +-----------------------+
+---------> | | v
| +-----------+
| +-------+
+-----------+ | DIFF +----->
| GENERATOR | | |
+-----------+ +---+---+
| ^
| |
| +-----------+ |
| | | |
+---------> | PROG-2 +-----------------------+
+-----------+
以下是一个尝试,但似乎不能可靠地工作,并且 "DIFF" 部分也没有实现。
package main
import (
"io"
"os"
"os/exec"
)
const UPPER = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
const LOWER = "abcdefghijklmnopqrstuvwxyz"
func runProg(r io.Reader, cmd *exec.Cmd) {
cmd.Stdin = r
cmd.Stdout = os.Stdout // I want this to go to a third prog call "diff".
cmd.Run()
}
func runIt(r io.Reader, prog1 *exec.Cmd, prog2 *exec.Cmd) {
r1, w1 := io.Pipe()
r2, w2 := io.Pipe()
go runProg(r1, prog1)
go runProg(r2, prog2)
go func() {
defer w1.Close()
defer w2.Close()
mw := io.MultiWriter(w1, w2)
io.Copy(mw, r)
}()
}
func main() {
generator := exec.Command("ls", "-l")
r, w := io.Pipe()
generator.Stdout = w
prog1 := exec.Command("tr", LOWER, UPPER)
prog2 := exec.Command("tr", UPPER, LOWER)
runIt(r, prog1, prog2)
generator.Run()
}
func (c *Cmd) StdinPipe() (io.WriteCloser, error)
和func (c *Cmd) StdoutPipe() (io.ReadCloser, error)
。 - SnoProblem