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Golang read from stdoutput
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#!/bin/sh | |
for i in {1..20} | |
do | |
echo "This is message $i" | |
sleep $i | |
done |
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package main | |
import ( | |
"bufio" | |
"bytes" | |
"fmt" | |
"io" | |
"log" | |
//"os" | |
"os/exec" | |
) | |
func readLine(reader *bufio.Reader) (strLine string, err error) { | |
buffer := new(bytes.Buffer) | |
for { | |
var line []byte | |
var isPrefix bool | |
log.Println("[INFO] Start reading line...") | |
line, isPrefix, err = reader.ReadLine() | |
log.Printf("[DEBUG] Read Len: %d, isPrefix: %t, Error: %v\n", len(line), isPrefix, err) | |
if err != nil && err != io.EOF { | |
return "", err | |
} | |
buffer.Write(line) | |
if !isPrefix { | |
log.Println("[INFO] EOL found") | |
break | |
} | |
} | |
log.Println("[DEBUG] End of line") | |
return buffer.String(), err | |
} | |
func main() { | |
//log.SetOutput(os.Stdout) | |
//cmd := exec.Command("./multiEcho.sh") | |
phantomjs := "/Users/zAthan/goLang/src/github.com/jgfrancisco/outPipeTest/phantomjs/bin/phantomjs" | |
cmd := exec.Command(phantomjs, "./hbsniffer.js", "http://topgear.com.ph") | |
stdout, err := cmd.StdoutPipe() | |
if err != nil { | |
log.Fatal(err) | |
} | |
if err := cmd.Start(); err != nil { | |
log.Fatal(err) | |
} | |
defer cmd.Wait() | |
go func() { | |
reader := bufio.NewReader(stdout) | |
for { | |
strline, err := readLine(reader) | |
if err != nil && err != io.EOF { | |
log.Fatal(err) | |
} | |
if len(strline) > 0 { | |
fmt.Printf("Read message: %s\n", strline) | |
} | |
if err == io.EOF { | |
fmt.Println("EOF. No more messages") | |
log.Println("[DEBUG] Exiting IO read") | |
break | |
} | |
fmt.Println("Waiting for the next message...") | |
} | |
log.Println("[DEBUG] Exiting go func()") | |
}() | |
fmt.Println("Waiting for output...") | |
} |
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