Replace file operations with functions

data.py

@@ -29,6 +29,26 @@ def _store_base(text: str, filename: str, exception_text: str,
     return False
 
 
+def save_with_err(text: str, filename: str, exception_text: str) -> bool:
+    """Saves a string to file and returns any error code
+    """
+    errno: int = 0
+    try:
+        with open(filename, 'w+', encoding='utf-8') as fp:
+            fp.write(text)
+            return True, errno
+    except OSError as exc:
+        if '[ex]' in exception_text:
+            exception_text = exception_text.replace('[ex]', str(exc))
+        errno = exc.errno
+        print(exception_text)
+    except UnicodeEncodeError as exc:
+        if '[ex]' in exception_text:
+            exception_text = exception_text.replace('[ex]', str(exc))
+        print(exception_text)
+    return False, errno
+
+
 def load_string(filename: str, exception_text: str) -> str:
     """Loads a string from file
     """
@@ -115,7 +135,7 @@ def save_binary(text: str, filename: str, exception_text: str) -> bool:
     """Saves a binary to file
     """
     try:
-        with open(filename, 'wb') as fp:
+        with open(filename, 'wb+') as fp:
             fp.write(text)
             return True
     except OSError as exc:

tests.py

@@ -247,6 +247,7 @@ from blog import html_blog_post_gemini_links
 from data import load_list
 from data import load_string
 from data import save_string
+from data import save_binary
 from data import erase_file
 from data import is_a_dir
 from data import makedir
@@ -4643,8 +4644,9 @@ def _test_danger_svg(base_dir: str) -> None:
         }
     }
 
-    with open(svg_image_filename, 'wb+') as fp_svg:
-        fp_svg.write(svg_content.encode('utf-8'))
+    binary_content = svg_content.encode('utf-8')
+    save_binary(binary_content, svg_image_filename,
+                'EX: save failed ' + svg_image_filename)
     assert os.path.isfile(svg_image_filename)
     assert svg_content != svg_clean
 
@@ -7250,11 +7252,8 @@ def _test_spoofed_geolocation() -> None:
 
     kml_str += '</Document>\n'
     kml_str += '</kml>'
-    try:
-        with open('unittest_decoy.kml', 'w+', encoding='utf-8') as fp_kml:
-            fp_kml.write(kml_str)
-    except OSError:
-        print('EX: unable to write unittest_decoy.kml')
+    save_string(kml_str, 'unittest_decoy.kml',
+                'EX: unable to write unittest_decoy.kml')
 
 
 def _test_skills() -> None:

utils.py

@@ -24,6 +24,8 @@ from unicodetext import standardize_text
 from formats import get_image_extensions
 from data import load_list
 from data import save_string
+from data import save_with_err
+from data import prepend_string
 from data import save_flag_file
 from data import load_string
 from data import append_string
@@ -911,15 +913,15 @@ def save_json(json_object: {}, filename: str) -> bool:
             return False
 
     tries: int = 1
+    savestr = json.dumps(json_object)
     while tries <= 5:
-        try:
-            with open(filename, 'w+', encoding='utf-8') as fp_json:
-                fp_json.write(json.dumps(json_object))
+        success, errno = \
+            save_with_err(savestr, filename,
+                          'EX: save_json ' + str(tries) + ' ' +
+                          str(filename) + ' [ex]')
+        if success:
             return True
-        except OSError as exc:
-            print('EX: save_json ' + str(tries) + ' ' + str(filename) +
-                  ' ' + str(exc))
-            if exc.errno == 36:
+        if errno == 36:
             # filename too long
             break
         time.sleep(1)
@@ -1636,16 +1638,10 @@ def follow_person(base_dir: str, nickname: str, domain: str,
                 print('DEBUG: follow already exists')
             return True
         # prepend to follow file
-        try:
-            with open(filename, 'r+', encoding='utf-8') as fp_foll:
-                content: str = fp_foll.read()
-                if handle_to_follow + '\n' not in content:
-                    fp_foll.seek(0, 0)
-                    fp_foll.write(handle_to_follow + '\n' + content)
+        if prepend_string(handle_to_follow, filename,
+                          'EX: Failed to write entry to follow file ' +
+                          filename + ' [ex]'):
             print('DEBUG: follow added')
-        except OSError as ex:
-            print('WARN: Failed to write entry to follow file ' +
-                  filename + ' ' + str(ex))
     else:
         # first follow
         if debug: