feat: integrate flask-orjson for improved JSON serialization performance (#23935)

api/app_factory.py

         ext_login,
         ext_mail,
         ext_migrate,
+        ext_orjson,
         ext_otel,
         ext_proxy_fix,
         ext_redis,
         ext_logging,
         ext_warnings,
         ext_import_modules,
+        ext_orjson,
         ext_set_secretkey,
         ext_compress,
         ext_code_based_extension,

api/core/helper/code_executor/template_transformer.py

 from collections.abc import Mapping
 from typing import Any
 
-from core.variables.utils import SegmentJSONEncoder
+from core.variables.utils import dumps_with_segments
 
 
 class TemplateTransformer(ABC):
 
     @classmethod
     def serialize_inputs(cls, inputs: Mapping[str, Any]) -> str:
-        inputs_json_str = json.dumps(inputs, ensure_ascii=False, cls=SegmentJSONEncoder).encode()
+        inputs_json_str = dumps_with_segments(inputs, ensure_ascii=False).encode()
         input_base64_encoded = b64encode(inputs_json_str).decode("utf-8")
         return input_base64_encoded
 

api/core/rag/datasource/keyword/jieba/jieba.py

-import json
 from collections import defaultdict
 from typing import Any, Optional
 
+import orjson
 from pydantic import BaseModel
 
 from configs import dify_config
         dataset_keyword_table = self.dataset.dataset_keyword_table
         keyword_data_source_type = dataset_keyword_table.data_source_type
         if keyword_data_source_type == "database":
-            dataset_keyword_table.keyword_table = json.dumps(keyword_table_dict, cls=SetEncoder)
+            dataset_keyword_table.keyword_table = dumps_with_sets(keyword_table_dict)
             db.session.commit()
         else:
             file_key = "keyword_files/" + self.dataset.tenant_id + "/" + self.dataset.id + ".txt"
             if storage.exists(file_key):
                 storage.delete(file_key)
-            storage.save(file_key, json.dumps(keyword_table_dict, cls=SetEncoder).encode("utf-8"))
+            storage.save(file_key, dumps_with_sets(keyword_table_dict).encode("utf-8"))
 
     def _get_dataset_keyword_table(self) -> Optional[dict]:
         dataset_keyword_table = self.dataset.dataset_keyword_table
                 data_source_type=keyword_data_source_type,
             )
             if keyword_data_source_type == "database":
-                dataset_keyword_table.keyword_table = json.dumps(
+                dataset_keyword_table.keyword_table = dumps_with_sets(
                     {
                         "__type__": "keyword_table",
                         "__data__": {"index_id": self.dataset.id, "summary": None, "table": {}},
-                    },
-                    cls=SetEncoder,
+                    }
                 )
             db.session.add(dataset_keyword_table)
             db.session.commit()
         self._save_dataset_keyword_table(keyword_table)
 
 
-class SetEncoder(json.JSONEncoder):
-    def default(self, obj):
-        if isinstance(obj, set):
-            return list(obj)
-        return super().default(obj)
+def set_orjson_default(obj: Any) -> Any:
+    """Default function for orjson serialization of set types"""
+    if isinstance(obj, set):
+        return list(obj)
+    raise TypeError(f"Object of type {type(obj).__name__} is not JSON serializable")
+
+
+def dumps_with_sets(obj: Any) -> str:
+    """JSON dumps with set support using orjson"""
+    return orjson.dumps(obj, default=set_orjson_default).decode("utf-8")

api/core/variables/utils.py

-import json
 from collections.abc import Iterable, Sequence
+from typing import Any
+
+import orjson
 
 from .segment_group import SegmentGroup
 from .segments import ArrayFileSegment, FileSegment, Segment
     return selectors
 
 
-class SegmentJSONEncoder(json.JSONEncoder):
-    def default(self, o):
-        if isinstance(o, ArrayFileSegment):
-            return [v.model_dump() for v in o.value]
-        elif isinstance(o, FileSegment):
-            return o.value.model_dump()
-        elif isinstance(o, SegmentGroup):
-            return [self.default(seg) for seg in o.value]
-        elif isinstance(o, Segment):
-            return o.value
-        else:
-            super().default(o)
+def segment_orjson_default(o: Any) -> Any:
+    """Default function for orjson serialization of Segment types"""
+    if isinstance(o, ArrayFileSegment):
+        return [v.model_dump() for v in o.value]
+    elif isinstance(o, FileSegment):
+        return o.value.model_dump()
+    elif isinstance(o, SegmentGroup):
+        return [segment_orjson_default(seg) for seg in o.value]
+    elif isinstance(o, Segment):
+        return o.value
+    raise TypeError(f"Object of type {type(o).__name__} is not JSON serializable")
+
+
+def dumps_with_segments(obj: Any, ensure_ascii: bool = False) -> str:
+    """JSON dumps with segment support using orjson"""
+    option = orjson.OPT_NON_STR_KEYS
+    return orjson.dumps(obj, default=segment_orjson_default, option=option).decode("utf-8")

api/extensions/ext_orjson.py

+from flask_orjson import OrjsonProvider
+
+from dify_app import DifyApp
+
+
+def init_app(app: DifyApp) -> None:
+    """Initialize Flask-Orjson extension for faster JSON serialization"""
+    app.json = OrjsonProvider(app)

api/models/workflow.py

             value: The Segment object to store as the variable's value.
         """
         self.__value = value
-        self.value = json.dumps(value, cls=variable_utils.SegmentJSONEncoder)
+        self.value = variable_utils.dumps_with_segments(value)
         self.value_type = value.value_type
 
     def get_node_id(self) -> str | None:

api/pyproject.toml

     "flask-cors~=6.0.0",
     "flask-login~=0.6.3",
     "flask-migrate~=4.0.7",
+    "flask-orjson~=2.0.0",
     "flask-restful~=0.3.10",
     "flask-sqlalchemy~=3.1.1",
     "gevent~=24.11.1",

api/uv.lock

     { name = "flask-cors" },
     { name = "flask-login" },
     { name = "flask-migrate" },
+    { name = "flask-orjson" },
     { name = "flask-restful" },
     { name = "flask-sqlalchemy" },
     { name = "gevent" },
     { name = "flask-cors", specifier = "~=6.0.0" },
     { name = "flask-login", specifier = "~=0.6.3" },
     { name = "flask-migrate", specifier = "~=4.0.7" },
+    { name = "flask-orjson", specifier = "~=2.0.0" },
     { name = "flask-restful", specifier = "~=0.3.10" },
     { name = "flask-sqlalchemy", specifier = "~=3.1.1" },
     { name = "gevent", specifier = "~=24.11.1" },
     { url = "https://files.pythonhosted.org/packages/93/01/587023575286236f95d2ab8a826c320375ed5ea2102bb103ed89704ffa6b/Flask_Migrate-4.0.7-py3-none-any.whl", hash = "sha256:5c532be17e7b43a223b7500d620edae33795df27c75811ddf32560f7d48ec617", size = 21127, upload-time = "2024-03-11T18:42:59.462Z" },
 ]
 
+[[package]]
+name = "flask-orjson"
+version = "2.0.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "flask" },
+    { name = "orjson" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/a3/49/575796f6ddca171d82dbb12762e33166c8b8f8616c946f0a6dfbb9bc3cd6/flask_orjson-2.0.0.tar.gz", hash = "sha256:6df6631437f9bc52cf9821735f896efa5583b5f80712f7d29d9ef69a79986a9c", size = 2974, upload-time = "2024-01-15T00:03:22.236Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/f3/ca/53e14be018a2284acf799830e8cd8e0b263c0fd3dff1ad7b35f8417e7067/flask_orjson-2.0.0-py3-none-any.whl", hash = "sha256:5d15f2ba94b8d6c02aee88fc156045016e83db9eda2c30545fabd640aebaec9d", size = 3622, upload-time = "2024-01-15T00:03:17.511Z" },
+]
+
 [[package]]
 name = "flask-restful"
 version = "0.3.10"