refine document upload (#602)

### What problem does this PR solve?

#567 

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

api/apps/document_app.py

     if 'file' not in request.files:
         return get_json_result(
             data=False, retmsg='No file part!', retcode=RetCode.ARGUMENT_ERROR)
-    file = request.files['file']
-    if file.filename == '':
-        return get_json_result(
-            data=False, retmsg='No file selected!', retcode=RetCode.ARGUMENT_ERROR)
 
-    try:
-        e, kb = KnowledgebaseService.get_by_id(kb_id)
-        if not e:
-            return get_data_error_result(
-                retmsg="Can't find this knowledgebase!")
-        MAX_FILE_NUM_PER_USER = int(os.environ.get('MAX_FILE_NUM_PER_USER', 0))
-        if MAX_FILE_NUM_PER_USER > 0 and DocumentService.get_doc_count(kb.tenant_id) >= MAX_FILE_NUM_PER_USER:
-            return get_data_error_result(
-                retmsg="Exceed the maximum file number of a free user!")
-
-        filename = duplicate_name(
-            DocumentService.query,
-            name=file.filename,
-            kb_id=kb.id)
-        filetype = filename_type(filename)
-        if filetype == FileType.OTHER.value:
-            return get_data_error_result(
-                retmsg="This type of file has not been supported yet!")
-
-        location = filename
-        while MINIO.obj_exist(kb_id, location):
-            location += "_"
-        blob = request.files['file'].read()
-        MINIO.put(kb_id, location, blob)
-        doc = {
-            "id": get_uuid(),
-            "kb_id": kb.id,
-            "parser_id": kb.parser_id,
-            "parser_config": kb.parser_config,
-            "created_by": current_user.id,
-            "type": filetype,
-            "name": filename,
-            "location": location,
-            "size": len(blob),
-            "thumbnail": thumbnail(filename, blob)
-        }
-        if doc["type"] == FileType.VISUAL:
-            doc["parser_id"] = ParserType.PICTURE.value
-        if re.search(r"\.(ppt|pptx|pages)$", filename):
-            doc["parser_id"] = ParserType.PRESENTATION.value
-        doc = DocumentService.insert(doc)
-        return get_json_result(data=doc.to_json())
-    except Exception as e:
-        return server_error_response(e)
+    file_objs = request.files.getlist('file')
+    for file_obj in file_objs:
+        if file_obj.filename == '':
+            return get_json_result(
+                data=False, retmsg='No file selected!', retcode=RetCode.ARGUMENT_ERROR)
+
+    err = []
+    for file in file_objs:
+        try:
+            e, kb = KnowledgebaseService.get_by_id(kb_id)
+            if not e:
+                raise LookupError("Can't find this knowledgebase!")
+            MAX_FILE_NUM_PER_USER = int(os.environ.get('MAX_FILE_NUM_PER_USER', 0))
+            if MAX_FILE_NUM_PER_USER > 0 and DocumentService.get_doc_count(kb.tenant_id) >= MAX_FILE_NUM_PER_USER:
+                raise RuntimeError("Exceed the maximum file number of a free user!")
+
+            filename = duplicate_name(
+                DocumentService.query,
+                name=file.filename,
+                kb_id=kb.id)
+            filetype = filename_type(filename)
+            if filetype == FileType.OTHER.value:
+                raise RuntimeError("This type of file has not been supported yet!")
+
+            location = filename
+            while MINIO.obj_exist(kb_id, location):
+                location += "_"
+            blob = file.read()
+            MINIO.put(kb_id, location, blob)
+            doc = {
+                "id": get_uuid(),
+                "kb_id": kb.id,
+                "parser_id": kb.parser_id,
+                "parser_config": kb.parser_config,
+                "created_by": current_user.id,
+                "type": filetype,
+                "name": filename,
+                "location": location,
+                "size": len(blob),
+                "thumbnail": thumbnail(filename, blob)
+            }
+            if doc["type"] == FileType.VISUAL:
+                doc["parser_id"] = ParserType.PICTURE.value
+            if re.search(r"\.(ppt|pptx|pages)$", filename):
+                doc["parser_id"] = ParserType.PRESENTATION.value
+            DocumentService.insert(doc)
+        except Exception as e:
+            err.append(file.filename + ": " + str(e))
+    if err:
+        return get_json_result(
+            data=False, retmsg="\n".join(err), retcode=RetCode.SERVER_ERROR)
+    return get_json_result(data=True)
 
 
 @manager.route('/create', methods=['POST'])

docker/entrypoint.sh

   task_exe $i $WS &
 done
 
+while [ 1 -eq 1 ];do
 $PY api/ragflow_server.py
-
+done
 wait;