[Other] Add a interface to get all pretrained models available from hub model server (#1022)

add get model list

python/fastdeploy/__init__.py

@@ -36,5 +36,5 @@ from . import c_lib_wrap as C
 from . import vision
 from . import pipeline
 from . import text
-from .download import download, download_and_decompress, download_model
+from .download import download, download_and_decompress, download_model, get_model_list
 from . import serving

python/fastdeploy/download.py

@@ -213,6 +213,30 @@ def download_and_decompress(url, path='.', rename=None):
     return
 
 
+def get_model_list(category: str=None):
+    '''
+    Get all pre-trained models information supported by fd.download_model.
+    Args:
+        category(str): model category, if None, list all models in all categories.
+    Returns:
+        results(dict): a dictionary, key is category, value is a list which contains models information.
+    '''
+    result = model_server.get_model_list()
+    if result['status'] != 0:
+        raise ValueError(
+            'Failed to get pretrained models information from hub model server.'
+        )
+    result = result['data']
+    if category is None:
+        return result
+    elif category in result:
+        return {category: result[category]}
+    else:
+        raise ValueError(
+            'No pretrained model in category {} can be downloaded now.'.format(
+                category))
+
+
 def download_model(name: str,
                    path: str=None,
                    format: str=None,
@@ -237,11 +261,13 @@ def download_model(name: str,
         if format == 'paddle':
             if url.count(".tgz") > 0 or url.count(".tar") > 0 or url.count(
                     "zip") > 0:
+                archive_path = fullpath
                 fullpath = decompress(fullpath)
                 try:
                     os.rename(fullpath,
                               os.path.join(os.path.dirname(fullpath), name))
                     fullpath = os.path.join(os.path.dirname(fullpath), name)
+                    os.remove(archive_path)
                 except FileExistsError:
                     pass
         print('Successfully download model at path: {}'.format(fullpath))

python/fastdeploy/utils/hub_model_server.py

@@ -98,6 +98,20 @@ class ModelServer(object):
         except requests.exceptions.ConnectionError as e:
             raise ServerConnectionError(self._url)
 
+    def get_model_list(self):
+        '''
+        Get all pre-trained models information in dataset.
+        Return:
+            result(dict): key is category name, value is a list which contains models \
+                information such as name, format and version.
+        '''
+        api = '{}/{}'.format(self._url, 'fastdeploy_listmodels')
+        try:
+            result = requests.get(api, timeout=self._timeout)
+            return result.json()
+        except requests.exceptions.ConnectionError as e:
+            raise ServerConnectionError(self._url)
+
     def is_connected(self):
         return self.check(self._url)