Feature: Add goctl env (#1557)

tools/goctl/pkg/goctl/goctl.go

@@ -0,0 +1,41 @@
+package goctl
+
+import (
+	"path/filepath"
+	"runtime"
+
+	"github.com/zeromicro/go-zero/tools/goctl/pkg/golang"
+	"github.com/zeromicro/go-zero/tools/goctl/util/console"
+	"github.com/zeromicro/go-zero/tools/goctl/util/pathx"
+	"github.com/zeromicro/go-zero/tools/goctl/vars"
+)
+
+func Install(cacheDir, name string, installFn func(dest string) (string, error)) (string, error) {
+	goBin := golang.GoBin()
+	cacheFile := filepath.Join(cacheDir, name)
+	binFile := filepath.Join(goBin, name)
+
+	goos := runtime.GOOS
+	if goos == vars.OsWindows {
+		cacheFile = cacheFile + ".exe"
+		binFile = binFile + ".exe"
+	}
+	// read cache.
+	err := pathx.Copy(cacheFile, binFile)
+	if err == nil {
+		console.Info("%q installed from cache", name)
+		return binFile, nil
+	}
+
+	binFile, err = installFn(binFile)
+	if err != nil {
+		return "", err
+	}
+
+	// write cache.
+	err = pathx.Copy(binFile, cacheFile)
+	if err != nil {
+		console.Warning("write cache error: %+v", err)
+	}
+	return binFile, nil
+}