Switch all concurrent tasks to use worker pool

util/util.go

@@ -1,11 +1,17 @@
 package util
 
 import (
+	"fmt"
+	"reflect"
 	"strings"
 
 	"github.com/coreos/go-semver/semver"
 )
 
+const (
+	WorkerThreads = 50
+)
+
 func StrToSemVer(version string) (*semver.Version, error) {
 	v, err := semver.NewVersion(strings.TrimPrefix(version, "v"))
 	if err != nil {
@@ -13,3 +19,21 @@ func StrToSemVer(version string) (*semver.Version, error) {
 	}
 	return v, nil
 }
+
+func GetObjectQueue(l interface{}) chan interface{} {
+	s := reflect.ValueOf(l)
+	c := make(chan interface{}, s.Len())
+
+	for i := 0; i < s.Len(); i++ {
+		c <- s.Index(i).Interface()
+	}
+	close(c)
+	return c
+}
+
+func ErrList(e []error) error {
+	if len(e) > 0 {
+		return fmt.Errorf("%v", e)
+	}
+	return nil
+}