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// Consume and unmarshall JSON.
//
// In this example JSON lines are added by createJSON in a tight loop.
// Each line is unmarshalled and a field printed.
// Exit with Ctrl+C.
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"strconv"
"github.com/nxadm/tail"
)
type jsonStruct struct {
Counter string `json:"counter"`
}
func main() {
file, err := ioutil.TempFile(os.TempDir(), "")
if err != nil {
panic(err)
}
fmt.Println(file.Name())
defer file.Close()
defer os.Remove(file.Name())
t, err := tail.TailFile(file.Name(), tail.Config{Follow: true})
if err != nil {
panic(err)
}
go createJSON(file)
var js jsonStruct
for line := range t.Lines {
fmt.Printf("JSON: " + line.Text + "\n")
err := json.Unmarshal([]byte(line.Text), &js)
if err != nil {
panic(err)
}
fmt.Printf("JSON counter field: " + js.Counter + "\n")
}
}
func createJSON(file *os.File) {
var counter int
for {
file.WriteString("{ \"counter\": \"" + strconv.Itoa(counter) + "\"}\n")
counter++
}
}
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