fix(agents-api): Fix for temporal running out of history size (#687)

Closes #678 
Closes #679 

Signed-off-by: Diwank Singh Tomer <diwank.singh@gmail.com>

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----

> [!IMPORTANT]
> This PR introduces remote data handling in the agents API to prevent
Temporal from running out of history size by storing large inputs and
outputs in a blob store.
> 
>   - **Activities**:
> - Add `save_inputs_remote_fn` and `load_inputs_remote_fn` in
`sync_items_remote.py` to handle large inputs by storing them in a blob
store.
> - Define `save_inputs_remote` and `load_inputs_remote` as activities.
>   - **Remote Handling**:
> - Introduce `RemoteObject`, `BaseRemoteModel`, and `RemoteList` in
`remote.py` to manage remote data storage and retrieval.
> - Modify `StepContext` in `tasks.py` to use `RemoteObject` for
`execution_input` and `inputs`.
>   - **Storage**:
> - Implement `store_in_blob_store_if_large` and
`load_from_blob_store_if_remote` in `storage_handler.py` to manage large
data.
> - Add `auto_blob_store_workflow` decorator for workflows to handle
remote data.
>   - **Workflows**:
> - Update `TaskExecutionWorkflow` in `task_execution/__init__.py` to
use remote activities for input/output handling.
> - Modify helper functions in `task_execution/helpers.py` to support
remote data handling.
>   - **Configuration**:
> - Change `blob_store_cutoff_kb` in `env.py` and `docker-compose.yml`
to 64KB and 128KB respectively for better data management.
> 
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Signed-off-by: Diwank Singh Tomer <diwank.singh@gmail.com>

agents-api/agents_api/activities/sync_items_remote.py

@@ -0,0 +1,24 @@
+from typing import Any
+
+from beartype import beartype
+from temporalio import activity
+
+from ..common.protocol.remote import RemoteObject
+
+
+@beartype
+async def save_inputs_remote_fn(inputs: list[Any]) -> list[Any | RemoteObject]:
+    from ..common.storage_handler import store_in_blob_store_if_large
+
+    return [store_in_blob_store_if_large(input) for input in inputs]
+
+
+@beartype
+async def load_inputs_remote_fn(inputs: list[Any | RemoteObject]) -> list[Any]:
+    from ..common.storage_handler import load_from_blob_store_if_remote
+
+    return [load_from_blob_store_if_remote(input) for input in inputs]
+
+
+save_inputs_remote = activity.defn(name="save_inputs_remote")(save_inputs_remote_fn)
+load_inputs_remote = activity.defn(name="load_inputs_remote")(load_inputs_remote_fn)

agents-api/agents_api/clients/s3.py

@@ -71,7 +71,7 @@ def add_object(key: str, body: bytes, replace: bool = False) -> None:
     client.put_object(Bucket=blob_store_bucket, Key=key, Body=body)
 
 
-@lru_cache(maxsize=256 * 1024 // blob_store_cutoff_kb)  # 256mb in cache
+@lru_cache(maxsize=256 * 1024 // max(1, blob_store_cutoff_kb))  # 256mb in cache
 @beartype
 def get_object(key: str) -> bytes:
     client = get_s3_client()

agents-api/agents_api/common/exceptions/tasks.py

@@ -121,7 +121,12 @@ def is_non_retryable_error(error: BaseException) -> bool:
 
     # Check for specific HTTP errors (status code == 429)
     if isinstance(error, httpx.HTTPStatusError):
-        if error.response.status_code in (408, 429, 503, 504):
+        if error.response.status_code in (
+            408,
+            429,
+            503,
+            504,
+        ):  # pytype: disable=attribute-error
             return False
 
     # If we don't know about the error, we should not retry

agents-api/agents_api/common/protocol/remote.py

@@ -0,0 +1,236 @@
+from dataclasses import dataclass
+from typing import Any, Iterator
+
+from temporalio import activity, workflow
+
+with workflow.unsafe.imports_passed_through():
+    from pydantic import BaseModel
+
+    from ...env import blob_store_bucket
+
+
+@dataclass
+class RemoteObject:
+    key: str
+    bucket: str = blob_store_bucket
+
+
+class BaseRemoteModel(BaseModel):
+    _remote_cache: dict[str, Any]
+
+    class Config:
+        arbitrary_types_allowed = True
+
+    def __init__(self, **data: Any):
+        super().__init__(**data)
+        self._remote_cache = {}
+
+    def __load_item(self, item: Any | RemoteObject) -> Any:
+        if not activity.in_activity():
+            return item
+
+        from ..storage_handler import load_from_blob_store_if_remote
+
+        return load_from_blob_store_if_remote(item)
+
+    def __save_item(self, item: Any) -> Any:
+        if not activity.in_activity():
+            return item
+
+        from ..storage_handler import store_in_blob_store_if_large
+
+        return store_in_blob_store_if_large(item)
+
+    def __getattribute__(self, name: str) -> Any:
+        if name.startswith("_"):
+            return super().__getattribute__(name)
+
+        try:
+            value = super().__getattribute__(name)
+        except AttributeError:
+            raise AttributeError(
+                f"'{type(self).__name__}' object has no attribute '{name}'"
+            )
+
+        if isinstance(value, RemoteObject):
+            cache = super().__getattribute__("_remote_cache")
+            if name in cache:
+                return cache[name]
+
+            loaded_data = self.__load_item(value)
+            cache[name] = loaded_data
+            return loaded_data
+
+        return value
+
+    def __setattr__(self, name: str, value: Any) -> None:
+        if name.startswith("_"):
+            super().__setattr__(name, value)
+            return
+
+        stored_value = self.__save_item(value)
+        super().__setattr__(name, stored_value)
+
+        if isinstance(stored_value, RemoteObject):
+            cache = self.__dict__.get("_remote_cache", {})
+            cache.pop(name, None)
+
+    def unload_attribute(self, name: str) -> None:
+        if name in self._remote_cache:
+            data = self._remote_cache.pop(name)
+            remote_obj = self.__save_item(data)
+            super().__setattr__(name, remote_obj)
+
+    def unload_all(self) -> None:
+        for name in list(self._remote_cache.keys()):
+            self.unload_attribute(name)
+
+
+class RemoteList(list):
+    _remote_cache: dict[int, Any]
+
+    def __init__(self, iterable: list[Any] | None = None):
+        super().__init__()
+        self._remote_cache: dict[int, Any] = {}
+        if iterable:
+            for item in iterable:
+                self.append(item)
+
+    def __load_item(self, item: Any | RemoteObject) -> Any:
+        if not activity.in_activity():
+            return item
+
+        from ..storage_handler import load_from_blob_store_if_remote
+
+        return load_from_blob_store_if_remote(item)
+
+    def __save_item(self, item: Any) -> Any:
+        if not activity.in_activity():
+            return item
+
+        from ..storage_handler import store_in_blob_store_if_large
+
+        return store_in_blob_store_if_large(item)
+
+    def __getitem__(self, index: int | slice) -> Any:
+        if isinstance(index, slice):
+            # Obtain the slice without triggering __getitem__ recursively
+            sliced_items = super().__getitem__(
+                index
+            )  # This returns a list of items as is
+            return RemoteList._from_existing_items(sliced_items)
+        else:
+            value = super().__getitem__(index)
+
+            if isinstance(value, RemoteObject):
+                if index in self._remote_cache:
+                    return self._remote_cache[index]
+                loaded_data = self.__load_item(value)
+                self._remote_cache[index] = loaded_data
+                return loaded_data
+            return value
+
+    @classmethod
+    def _from_existing_items(cls, items: list[Any]) -> "RemoteList":
+        """
+        Create a RemoteList from existing items without processing them again.
+        This method ensures that slicing does not trigger loading of items.
+        """
+        new_remote_list = cls.__new__(
+            cls
+        )  # Create a new instance without calling __init__
+        list.__init__(new_remote_list)  # Initialize as an empty list
+        new_remote_list._remote_cache = {}
+        new_remote_list._extend_without_processing(items)
+        return new_remote_list
+
+    def _extend_without_processing(self, items: list[Any]) -> None:
+        """
+        Extend the list without processing the items (i.e., without storing them again).
+        """
+        super().extend(items)
+
+    def __setitem__(self, index: int | slice, value: Any) -> None:
+        if isinstance(index, slice):
+            # Handle slice assignment without processing existing RemoteObjects
+            processed_values = [self.__save_item(v) for v in value]
+            super().__setitem__(index, processed_values)
+            # Clear cache for affected indices
+            for i in range(*index.indices(len(self))):
+                self._remote_cache.pop(i, None)
+        else:
+            stored_value = self.__save_item(value)
+            super().__setitem__(index, stored_value)
+            self._remote_cache.pop(index, None)
+
+    def append(self, value: Any) -> None:
+        stored_value = self.__save_item(value)
+        super().append(stored_value)
+        # No need to cache immediately
+
+    def insert(self, index: int, value: Any) -> None:
+        stored_value = self.__save_item(value)
+        super().insert(index, stored_value)
+        # Adjust cache indices
+        self._shift_cache_on_insert(index)
+
+    def _shift_cache_on_insert(self, index: int) -> None:
+        new_cache = {}
+        for i, v in self._remote_cache.items():
+            if i >= index:
+                new_cache[i + 1] = v
+            else:
+                new_cache[i] = v
+        self._remote_cache = new_cache
+
+    def remove(self, value: Any) -> None:
+        # Find the index of the value to remove
+        index = self.index(value)
+        super().remove(value)
+        self._remote_cache.pop(index, None)
+        # Adjust cache indices
+        self._shift_cache_on_remove(index)
+
+    def _shift_cache_on_remove(self, index: int) -> None:
+        new_cache = {}
+        for i, v in self._remote_cache.items():
+            if i > index:
+                new_cache[i - 1] = v
+            elif i < index:
+                new_cache[i] = v
+            # Else: i == index, already removed
+        self._remote_cache = new_cache
+
+    def pop(self, index: int = -1) -> Any:
+        value = super().pop(index)
+        # Adjust negative indices
+        if index < 0:
+            index = len(self) + index
+        self._remote_cache.pop(index, None)
+        # Adjust cache indices
+        self._shift_cache_on_remove(index)
+        return value
+
+    def clear(self) -> None:
+        super().clear()
+        self._remote_cache.clear()
+
+    def extend(self, iterable: list[Any]) -> None:
+        for item in iterable:
+            self.append(item)
+
+    def __iter__(self) -> Iterator[Any]:
+        for index in range(len(self)):
+            yield self.__getitem__(index)
+
+    def unload_item(self, index: int) -> None:
+        """Unload a specific item and replace it with a RemoteObject."""
+        if index in self._remote_cache:
+            data = self._remote_cache.pop(index)
+            remote_obj = self.__save_item(data)
+            super().__setitem__(index, remote_obj)
+
+    def unload_all(self) -> None:
+        """Unload all cached items."""
+        for index in list(self._remote_cache.keys()):
+            self.unload_item(index)

agents-api/agents_api/common/protocol/tasks.py

@@ -1,31 +1,34 @@
-from dataclasses import dataclass
 from typing import Annotated, Any
 from uuid import UUID
 
-from pydantic import BaseModel, Field, computed_field
-from pydantic_partial import create_partial_model
-
-from ...autogen.openapi_model import (
-    Agent,
-    CreateTaskRequest,
-    CreateTransitionRequest,
-    Execution,
-    ExecutionStatus,
-    PartialTaskSpecDef,
-    PatchTaskRequest,
-    Session,
-    Task,
-    TaskSpec,
-    TaskSpecDef,
-    TaskToolDef,
-    Tool,
-    TransitionTarget,
-    TransitionType,
-    UpdateTaskRequest,
-    User,
-    Workflow,
-    WorkflowStep,
-)
+from temporalio import workflow
+
+with workflow.unsafe.imports_passed_through():
+    from pydantic import BaseModel, Field, computed_field
+    from pydantic_partial import create_partial_model
+
+    from ...autogen.openapi_model import (
+        Agent,
+        CreateTaskRequest,
+        CreateTransitionRequest,
+        Execution,
+        ExecutionStatus,
+        PartialTaskSpecDef,
+        PatchTaskRequest,
+        Session,
+        Task,
+        TaskSpec,
+        TaskSpecDef,
+        TaskToolDef,
+        Tool,
+        TransitionTarget,
+        TransitionType,
+        UpdateTaskRequest,
+        User,
+        Workflow,
+        WorkflowStep,
+    )
+    from .remote import BaseRemoteModel, RemoteObject
 
 # TODO: Maybe we should use a library for this
 
@@ -136,9 +139,9 @@ class ExecutionInput(BaseModel):
     session: Session | None = None
 
 
-class StepContext(BaseModel):
-    execution_input: ExecutionInput
-    inputs: list[Any]
+class StepContext(BaseRemoteModel):
+    execution_input: ExecutionInput | RemoteObject
+    inputs: list[Any] | RemoteObject
     cursor: TransitionTarget
 
     @computed_field
@@ -216,11 +219,6 @@ class StepOutcome(BaseModel):
     transition_to: tuple[TransitionType, TransitionTarget] | None = None
 
 
-@dataclass
-class RemoteObject:
-    key: str
-
-
 def task_to_spec(
     task: Task | CreateTaskRequest | UpdateTaskRequest | PatchTaskRequest, **model_opts
 ) -> TaskSpecDef | PartialTaskSpecDef: