docs: Add missing docstrings fetch_json_db.py (intel#3381)

cve_bin_tool/fetch_json_db.py

@@ -41,6 +41,9 @@ def __init__(
         log_signature_error,
         error_mode: ErrorMode = ErrorMode.TruncTrace,
     ) -> None:
+        """
+        Initialize the Fetch_JSON_DB instance.
+        """
         self.root = cache_dir / "json_data"
         self.pubkey = pubkey
         self.ignore_signature = ignore_signature
@@ -55,6 +58,9 @@ def __init__(
         self.failed_count = 0
 
     async def handle_download(self):
+        """
+        Manages the download process of JSON files from the mirror.
+        """
         self.connector = aiohttp.TCPConnector(limit_per_host=10)
         async with aiohttp.ClientSession(
             connector=self.connector, headers=HTTP_HEADERS, trust_env=True
@@ -90,6 +96,9 @@ async def handle_download(self):
                 self.cleanup_directory()
 
     def cleanup_directory(self):
+        """
+        Cleans up the directory structure and removes temporary files.
+        """
         for directory in self.DIRECTORIES:
             if (self.root / directory).exists():
                 shutil.rmtree(self.root / directory)
@@ -99,6 +108,9 @@ def cleanup_directory(self):
             Path.unlink(self.root / "metadata.json")
 
     def update_directory_structure(self):
+        """
+        Updates the directory structure for storing downloaded files.
+        """
         if self.root.is_dir():
             shutil.rmtree(self.root)
         self.root.mkdir()
@@ -108,6 +120,9 @@ def update_directory_structure(self):
                 dir.mkdir()
 
     def get_download_urls(self, session):
+        """
+        Retrieves the URLs for downloading JSON files from the mirror.
+        """
         for key in self.metadata["db"]:
             self.tasks.extend(
                 [
@@ -124,6 +139,9 @@ def get_download_urls(self, session):
                 )
 
     def get_failed_downloads(self):
+        """
+        Identifies and logs unsuccessful download attempts.
+        """
         db = {}
         for key in self.metadata["db"]:
             db[key] = []
@@ -133,6 +151,9 @@ def get_failed_downloads(self):
         self.metadata["db"] = db
 
     async def download_files(self, tasks, description):
+        """
+        Downloads files asynchronously from the mirror.
+        """
         # error_mode.value will only be greater than 1 if quiet mode.
         if self.error_mode.value > 1:
             total_tasks = len(tasks)
@@ -157,6 +178,9 @@ async def download_files(self, tasks, description):
                 self.download_failed = True
 
     async def get_metdata(self, session):
+        """
+        Fetches and stores metadata information from the mirror.
+        """
         resp = await session.get(f"{self.mirror}/metadata.json")
         resp.raise_for_status()
         if resp.status == 200:
@@ -177,6 +201,9 @@ async def get_metdata(self, session):
             self.is_signed = False
 
     def verify_signature(self):
+        """
+        Checks the authenticity of downloaded metadata using signatures.
+        """
         temp_gnupg_home = Path(tempfile.mkdtemp(prefix=".gnupg-"))
         gpg = gnupg.GPG(gnupghome=temp_gnupg_home)
         if self.pubkey: