Add GraphRAG Cache package.

docs/config/yaml.md

@@ -141,12 +141,14 @@ This section controls the cache mechanism used by the pipeline. This is used to
 
 #### Fields
 
-- `type` **file|memory|blob|cosmosdb** - The storage type to use. Default=`file`
-- `base_dir` **str** - The base directory to write output artifacts to, relative to the root.
-- `connection_string` **str** - (blob/cosmosdb only) The Azure Storage connection string.
-- `container_name` **str** - (blob/cosmosdb only) The Azure Storage container name.
-- `storage_account_blob_url` **str** - (blob only) The storage account blob URL to use.
-- `cosmosdb_account_blob_url` **str** - (cosmosdb only) The CosmosDB account blob URL to use.
+- `type` **json|memory|none** - The storage type to use. Default=`json`
+- `storage` **StorageConfig**
+  - `type` **file|memory|blob|cosmosdb** - The storage type to use. Default=`file`
+  - `base_dir` **str** - The base directory to write output artifacts to, relative to the root.
+  - `connection_string` **str** - (blob/cosmosdb only) The Azure Storage connection string.
+  - `container_name` **str** - (blob/cosmosdb only) The Azure Storage container name.
+  - `storage_account_blob_url` **str** - (blob only) The storage account blob URL to use.
+  - `cosmosdb_account_blob_url` **str** - (cosmosdb only) The CosmosDB account blob URL to use.
 
 ### reporting
 

packages/graphrag-cache/README.md

@@ -0,0 +1,92 @@
+# GraphRAG Cache
+
+## Basic
+
+```python
+import asyncio
+from graphrag_storage import StorageConfig, create_storage, StorageType
+from graphrag_cache import CacheConfig, create_cache, CacheType
+
+async def run():
+    cache = create_cache(
+        CacheConfig(
+            type=CacheType.Json
+            storage=StorageConfig(
+                type=StorageType.File,
+                base_dir="cache"
+            )
+        ),
+    )
+
+    await cache.set("my_key", {"some": "object to cache"})
+    print(await cache.get("my_key"))
+
+if __name__ == "__main__":
+    asyncio.run(run())
+```
+
+## Custom Cache
+
+```python
+import asyncio
+from typing import Any
+from graphrag_storage import Storage
+from graphrag_cache import Cache, CacheConfig, create_cache, register_cache
+
+class MyCache(Cache):
+    def __init__(self, some_setting: str, optional_setting: str = "default setting", **kwargs: Any):
+        # Validate settings and initialize
+        # View the JsonCache implementation to see how to create a cache that relies on a Storage provider.
+        ...
+
+    #Implement rest of interface
+    ...
+
+register_cache("MyCache", MyCache)
+
+async def run():
+    cache = create_cache(
+        CacheConfig(
+            type="MyCache",
+            some_setting="My Setting"
+        )
+    )
+
+    # Or use the factory directly to instantiate with a dict instead of using
+    # CacheConfig + create_factory
+    # from graphrag_cache.cache_factory import cache_factory
+    # cache = cache_factory.create(strategy="MyCache", init_args={"some_setting": "My Setting"})
+
+    await cache.set("my_key", {"some": "object to cache"})
+    print(await cache.get("my_key"))
+
+if __name__ == "__main__":
+    asyncio.run(run())
+```
+
+### Details
+
+By default, the `create_cache` comes with the following cache providers registered that correspond to the entries in the `CacheType` enum. 
+
+- `JsonCache`
+- `MemoryCache`
+- `NoopCache`
+
+The preregistration happens dynamically, e.g., `JsonCache` is only imported and registered if you request a `JsonCache` with `create_cache(CacheType.Json, ...)`. There is no need to manually import and register builtin cache providers when using `create_cache`.
+
+If you want a clean factory with no preregistered cache providers then directly import `cache_factory` and bypass using `create_cache`. The downside is that `cache_factory.create` uses a dict for init args instead of the strongly typed `CacheConfig` used with `create_cache`.
+
+```python
+from graphrag_cache.cache_factory import cache_factory
+from graphrag_cache.json_cache import JsonCache
+
+# cache_factory has no preregistered providers so you must register any
+# providers you plan on using.
+# May also register a custom implementation, see above for example.
+cache_factory.register("my_cache_impl", JsonCache)
+
+cache = cache_factory.create(strategy="my_cache_impl", init_args={"some_setting": "..."})
+
+...
+
+```

packages/graphrag-cache/graphrag_cache/__init__.py

@@ -0,0 +1,17 @@
+# Copyright (c) 2024 Microsoft Corporation.
+# Licensed under the MIT License
+
+"""The GraphRAG Cache package."""
+
+from graphrag_cache.cache import Cache
+from graphrag_cache.cache_config import CacheConfig
+from graphrag_cache.cache_factory import create_cache, register_cache
+from graphrag_cache.cache_type import CacheType
+
+__all__ = [
+    "Cache",
+    "CacheConfig",
+    "CacheType",
+    "create_cache",
+    "register_cache",
+]

packages/graphrag/graphrag/cache/pipeline_cache.py → packages/graphrag-cache/graphrag_cache/cache.py

@@ -1,17 +1,21 @@
 # Copyright (c) 2024 Microsoft Corporation.
 # Licensed under the MIT License
 
-"""A module containing 'PipelineCache' model."""
+"""Abstract base class for cache."""
 
 from __future__ import annotations
 
-from abc import ABCMeta, abstractmethod
+from abc import ABC, abstractmethod
 from typing import Any
 
 
-class PipelineCache(metaclass=ABCMeta):
+class Cache(ABC):
     """Provide a cache interface for the pipeline."""
 
+    @abstractmethod
+    def __init__(self, **kwargs: Any) -> None:
+        """Create a cache instance."""
+
     @abstractmethod
     async def get(self, key: str) -> Any:
         """Get the value for the given key.
@@ -59,7 +63,7 @@ async def clear(self) -> None:
         """Clear the cache."""
 
     @abstractmethod
-    def child(self, name: str) -> PipelineCache:
+    def child(self, name: str) -> Cache:
         """Create a child cache with the given name.
 
         Args:

packages/graphrag-cache/graphrag_cache/cache_config.py

@@ -0,0 +1,26 @@
+# Copyright (c) 2024 Microsoft Corporation.
+# Licensed under the MIT License
+
+"""Cache configuration model."""
+
+from graphrag_storage import StorageConfig
+from pydantic import BaseModel, ConfigDict, Field
+
+from graphrag_cache.cache_type import CacheType
+
+
+class CacheConfig(BaseModel):
+    """The configuration section for cache."""
+
+    model_config = ConfigDict(extra="allow")
+    """Allow extra fields to support custom cache implementations."""
+
+    type: str = Field(
+        description="The cache type to use. Builtin types include 'Json', 'Memory', and 'Noop'.",
+        default=CacheType.Json,
+    )
+
+    storage: StorageConfig | None = Field(
+        description="The storage configuration to use for file-based caches such as 'Json'.",
+        default=None,
+    )

packages/graphrag-cache/graphrag_cache/cache_factory.py

@@ -0,0 +1,83 @@
+# Copyright (c) 2024 Microsoft Corporation.
+# Licensed under the MIT License
+
+
+"""Cache factory implementation."""
+
+from collections.abc import Callable
+
+from graphrag_common.factory import Factory, ServiceScope
+from graphrag_storage import Storage
+
+from graphrag_cache.cache import Cache
+from graphrag_cache.cache_config import CacheConfig
+from graphrag_cache.cache_type import CacheType
+
+
+class CacheFactory(Factory[Cache]):
+    """A factory class for cache implementations."""
+
+
+cache_factory = CacheFactory()
+
+
+def register_cache(
+    cache_type: str,
+    cache_initializer: Callable[..., Cache],
+    scope: ServiceScope = "transient",
+) -> None:
+    """Register a custom storage implementation.
+
+    Args
+    ----
+        - cache_type: str
+            The cache id to register.
+        - cache_initializer: Callable[..., Cache]
+            The cache initializer to register.
+    """
+    cache_factory.register(cache_type, cache_initializer, scope)
+
+
+def create_cache(config: CacheConfig, storage: Storage | None = None) -> Cache:
+    """Create a cache implementation based on the given configuration.
+
+    Args
+    ----
+        - config: CacheConfig
+            The cache configuration to use.
+        - storage: Storage | None
+            The storage implementation to use for file-based caches such as 'Json'.
+
+    Returns
+    -------
+        Cache
+            The created cache implementation.
+    """
+    config_model = config.model_dump()
+    cache_strategy = config.type
+
+    if cache_strategy not in cache_factory:
+        match cache_strategy:
+            case CacheType.Json:
+                from graphrag_cache.json_cache import JsonCache
+
+                register_cache(CacheType.Json, JsonCache)
+
+            case CacheType.Memory:
+                from graphrag_cache.memory_cache import MemoryCache
+
+                register_cache(CacheType.Memory, MemoryCache)
+
+            case CacheType.Noop:
+                from graphrag_cache.noop_cache import NoopCache
+
+                register_cache(CacheType.Noop, NoopCache)
+
+            case _:
+                msg = f"CacheConfig.type '{cache_strategy}' is not registered in the CacheFactory. Registered types: {', '.join(cache_factory.keys())}."
+                raise ValueError(msg)
+
+    if storage:
+        config_model["storage"] = storage
+
+    return cache_factory.create(strategy=cache_strategy, init_args=config_model)

packages/graphrag-cache/graphrag_cache/cache_type.py

@@ -0,0 +1,15 @@
+# Copyright (c) 2024 Microsoft Corporation.
+# Licensed under the MIT License
+
+
+"""Builtin cache implementation types."""
+
+from enum import StrEnum
+
+
+class CacheType(StrEnum):
+    """Enum for cache types."""
+
+    Json = "json"
+    Memory = "memory"
+    Noop = "none"

packages/graphrag/graphrag/cache/json_pipeline_cache.py → packages/graphrag-cache/graphrag_cache/json_cache.py

@@ -6,27 +6,35 @@
 import json
 from typing import Any
 
-from graphrag_storage import Storage
+from graphrag_storage import Storage, StorageConfig, create_storage
 
-from graphrag.cache.pipeline_cache import PipelineCache
+from graphrag_cache.cache import Cache
 
 
-class JsonPipelineCache(PipelineCache):
+class JsonCache(Cache):
     """File pipeline cache class definition."""
 
     _storage: Storage
-    _encoding: str
 
-    def __init__(self, storage: Storage, encoding="utf-8"):
+    def __init__(
+        self,
+        storage: Storage | dict[str, Any] | None = None,
+        **kwargs: Any,
+    ) -> None:
         """Init method definition."""
-        self._storage = storage
-        self._encoding = encoding
+        if storage is None:
+            msg = "JsonCache requires either a Storage instance to be provided or a StorageConfig to create one."
+            raise ValueError(msg)
+        if isinstance(storage, Storage):
+            self._storage = storage
+        else:
+            self._storage = create_storage(StorageConfig(**storage))
 
-    async def get(self, key: str) -> str | None:
+    async def get(self, key: str) -> Any | None:
         """Get method definition."""
         if await self.has(key):
             try:
-                data = await self._storage.get(key, encoding=self._encoding)
+                data = await self._storage.get(key)
                 data = json.loads(data)
             except UnicodeDecodeError:
                 await self._storage.delete(key)
@@ -44,9 +52,7 @@ async def set(self, key: str, value: Any, debug_data: dict | None = None) -> Non
         if value is None:
             return
         data = {"result": value, **(debug_data or {})}
-        await self._storage.set(
-            key, json.dumps(data, ensure_ascii=False), encoding=self._encoding
-        )
+        await self._storage.set(key, json.dumps(data, ensure_ascii=False))
 
     async def has(self, key: str) -> bool:
         """Has method definition."""
@@ -61,6 +67,6 @@ async def clear(self) -> None:
         """Clear method definition."""
         await self._storage.clear()
 
-    def child(self, name: str) -> "JsonPipelineCache":
+    def child(self, name: str) -> "Cache":
         """Child method definition."""
-        return JsonPipelineCache(self._storage.child(name), encoding=self._encoding)
+        return JsonCache(storage=self._storage.child(name))