[client:config] config management to get 'io.Reader' and 'io.Writer' + config directory+files management for {client.keyset} to be stored/fetched

src/git.xdrm.io/schastsp/client/config.go

@@ -0,0 +1,118 @@
+package client;
+
+import (
+	"io"
+	"fmt"
+	"path/filepath"
+	"errors"
+	"os"
+)
+
+
+type config struct {
+	path string // absolute configuration file path
+	fd *os.File // file descriptor
+}
+
+/* (1) Constructor
+*
+* @dir<string>						Dir path
+* @name<string>						file name
+*
+---------------------------------------------------------*/
+func Config(dir string, name string) (*config, error) {
+
+	inst := new(config);
+
+
+	/* (1) Check directory */
+	absoluteDir, err := filepath.Abs(dir);
+	if err != nil { return nil, err; }
+
+	if info, err := os.Stat(absoluteDir); err != nil {
+
+		// fail if directory does not exist
+		if os.IsNotExist(err) {
+
+			// try to create file
+			err2 := os.MkdirAll(absoluteDir, 0755);
+
+			if err2 != nil {
+				return nil, errors.New("Cannot create missing configuration dir");
+			}
+
+		// fail if not a directory
+		} else if !info.Mode().IsDir() {
+			return nil, errors.New("Configuration dir is not a directory");
+		}
+
+	}
+
+
+	/* (2) Build full path */
+	basename := filepath.Base(name);
+
+	fullpath := fmt.Sprintf("%s/%s", absoluteDir, basename);
+
+
+	/* (3) Check file */
+	info, err := os.Stat(fullpath);
+	if err != nil {
+
+		// If not exists
+		if os.IsNotExist(err) {
+
+			// try to create file
+			_, err2 := os.Create(fullpath);
+
+			if err2 != nil {
+				return nil, errors.New("Cannot create missing configuration file");
+			}
+
+		}
+
+		// fail if exists but not regular file
+		if !info.Mode().IsRegular() {
+			return nil, errors.New("Configuration file is not a regular file");
+		}
+
+	}
+
+	fmt.Printf("hehe: %t\n", info.Mode().IsRegular());
+	inst.path = fullpath
+
+	return inst, nil
+
+}
+
+
+/* (2) Get Reader on the file
+*
+* @return reader<io.Reader>			File reader
+* 									NIL on error
+*
+---------------------------------------------------------*/
+func (c config) Reader() io.ReadCloser {
+
+	file, err := os.Open(c.path);
+	if err != nil { return nil }
+
+	return file;
+
+}
+
+
+/* (3) Get Writer on the file
+*
+* @return reader<io.Writer>			File reader
+* 									NIL on error
+*
+---------------------------------------------------------*/
+func (c config) Writer() io.WriteCloser {
+
+	file, err := os.OpenFile(c.path, os.O_RDWR|os.O_CREATE, 0755);
+	if err != nil { return nil }
+
+	return file;
+
+}