[ISSUE #10552] move stream slicer concept in concurrent CDK

airbyte_cdk/sources/declarative/concurrent_declarative_source.py

@@ -30,12 +30,15 @@
 )
 from airbyte_cdk.sources.declarative.requesters import HttpRequester
 from airbyte_cdk.sources.declarative.retrievers import SimpleRetriever
+from airbyte_cdk.sources.declarative.stream_slicers.declarative_partition_generator import (
+    DeclarativePartitionFactory,
+    StreamSlicerPartitionGenerator,
+)
 from airbyte_cdk.sources.declarative.transformations.add_fields import AddFields
 from airbyte_cdk.sources.declarative.types import ConnectionDefinition
 from airbyte_cdk.sources.source import TState
 from airbyte_cdk.sources.streams import Stream
 from airbyte_cdk.sources.streams.concurrent.abstract_stream import AbstractStream
-from airbyte_cdk.sources.streams.concurrent.adapters import CursorPartitionGenerator
 from airbyte_cdk.sources.streams.concurrent.availability_strategy import (
     AlwaysAvailableAvailabilityStrategy,
 )
@@ -228,13 +231,15 @@ def _group_streams(
                             )
                         declarative_stream.retriever.cursor = None
 
-                    partition_generator = CursorPartitionGenerator(
-                        stream=declarative_stream,
-                        message_repository=self.message_repository,  # type: ignore  # message_repository is always instantiated with a value by factory
-                        cursor=cursor,
-                        connector_state_converter=connector_state_converter,
-                        cursor_field=[cursor.cursor_field.cursor_field_key],
-                        slice_boundary_fields=cursor.slice_boundary_fields,
+
+                    partition_generator = StreamSlicerPartitionGenerator(
+                        DeclarativePartitionFactory(
+                            declarative_stream.name,
+                            declarative_stream.get_json_schema(),
+                            declarative_stream.retriever,
+                            self.message_repository,
+                        ),
+                        cursor,
                     )
 
                     concurrent_streams.append(

airbyte_cdk/sources/declarative/manifest_declarative_source.py

@@ -94,7 +94,7 @@ def resolved_manifest(self) -> Mapping[str, Any]:
         return self._source_config
 
     @property
-    def message_repository(self) -> Union[None, MessageRepository]:
+    def message_repository(self) -> MessageRepository:
         return self._message_repository
 
     @property

airbyte_cdk/sources/declarative/stream_slicers/declarative_partition_generator.py

@@ -0,0 +1,66 @@
+# Copyright (c) 2024 Airbyte, Inc., all rights reserved.
+
+from typing import Iterable, Optional, Mapping, Any
+
+from airbyte_cdk.sources.declarative.retrievers import Retriever
+from airbyte_cdk.sources.message import MessageRepository
+from airbyte_cdk.sources.streams.concurrent.partitions.partition import Partition
+from airbyte_cdk.sources.streams.concurrent.partitions.partition_generator import PartitionGenerator
+from airbyte_cdk.sources.streams.concurrent.partitions.record import Record
+from airbyte_cdk.sources.streams.concurrent.partitions.stream_slicer import StreamSlicer
+from airbyte_cdk.sources.types import StreamSlice
+from airbyte_cdk.utils.slice_hasher import SliceHasher
+
+
+class DeclarativePartitionFactory:
+    def __init__(self, stream_name: str, json_schema: Mapping[str, Any], retriever: Retriever, message_repository: MessageRepository) -> None:
+        self._stream_name = stream_name
+        self._json_schema = json_schema
+        self._retriever = retriever  # FIXME: it should be a retriever_factory here to ensure that paginators and other classes don't share interal/class state
+        self._message_repository = message_repository
+
+    def create(self, stream_slice: StreamSlice) -> Partition:
+        return DeclarativePartition(
+            self._stream_name,
+            self._json_schema,
+            self._retriever,
+            self._message_repository,
+            stream_slice,
+        )
+
+
+class DeclarativePartition(Partition):
+    def __init__(self, stream_name: str, json_schema: Mapping[str, Any], retriever: Retriever, message_repository: MessageRepository, stream_slice: StreamSlice):
+        self._stream_name = stream_name
+        self._json_schema = json_schema
+        self._retriever = retriever
+        self._message_repository = message_repository
+        self._stream_slice = stream_slice
+        self._hash = SliceHasher.hash(self._stream_name, self._stream_slice)
+
+    def read(self) -> Iterable[Record]:
+        for stream_data in self._retriever.read_records(self._json_schema, self._stream_slice):
+            if isinstance(stream_data, Mapping):
+                # TODO validate if this is necessary: self._stream.transformer.transform(data_to_return, self._stream.get_json_schema())
+                yield Record(stream_data, self)
+            else:
+                self._message_repository.emit_message(stream_data)
+
+    def to_slice(self) -> Optional[Mapping[str, Any]]:
+        return self._stream_slice
+
+    def stream_name(self) -> str:
+        return self._stream_name
+
+    def __hash__(self) -> int:
+        return self._hash
+
+
+class StreamSlicerPartitionGenerator(PartitionGenerator):
+    def __init__(self, partition_factory: DeclarativePartitionFactory, stream_slicer: StreamSlicer) -> None:
+        self._partition_factory = partition_factory
+        self._stream_slicer = stream_slicer
+
+    def generate(self) -> Iterable[Partition]:
+        for stream_slice in self._stream_slicer.stream_slices():
+            yield self._partition_factory.create(stream_slice)

airbyte_cdk/sources/declarative/stream_slicers/stream_slicer.py

@@ -2,18 +2,15 @@
 # Copyright (c) 2023 Airbyte, Inc., all rights reserved.
 #
 
-from abc import abstractmethod
-from dataclasses import dataclass
-from typing import Iterable
+from abc import ABC
 
 from airbyte_cdk.sources.declarative.requesters.request_options.request_options_provider import (
     RequestOptionsProvider,
 )
-from airbyte_cdk.sources.types import StreamSlice
+from airbyte_cdk.sources.streams.concurrent.partitions.stream_slicer import StreamSlicer as ConcurrentStreamSlicer
 
 
-@dataclass
-class StreamSlicer(RequestOptionsProvider):
+class StreamSlicer(ConcurrentStreamSlicer, RequestOptionsProvider, ABC):
     """
     Slices the stream into a subset of records.
     Slices enable state checkpointing and data retrieval parallelization.
@@ -22,11 +19,4 @@ class StreamSlicer(RequestOptionsProvider):
 
     See the stream slicing section of the docs for more information.
     """
-
-    @abstractmethod
-    def stream_slices(self) -> Iterable[StreamSlice]:
-        """
-        Defines stream slices
-
-        :return: List of stream slices
-        """
+    pass

airbyte_cdk/sources/streams/concurrent/adapters.py

@@ -47,6 +47,8 @@
 from airbyte_cdk.sources.utils.slice_logger import SliceLogger
 from deprecated.classic import deprecated
 
+from airbyte_cdk.utils.slice_hasher import SliceHasher
+
 """
 This module contains adapters to help enabling concurrency on Stream objects without needing to migrate to AbstractStream
 """
@@ -270,6 +272,7 @@ def __init__(
         self._sync_mode = sync_mode
         self._cursor_field = cursor_field
         self._state = state
+        self._hash = SliceHasher.hash(self._stream.name, self._slice)
 
     def read(self) -> Iterable[Record]:
         """
@@ -309,12 +312,7 @@ def to_slice(self) -> Optional[Mapping[str, Any]]:
         return self._slice
 
     def __hash__(self) -> int:
-        if self._slice:
-            # Convert the slice to a string so that it can be hashed
-            s = json.dumps(self._slice, sort_keys=True, cls=SliceEncoder)
-            return hash((self._stream.name, s))
-        else:
-            return hash(self._stream.name)
+        return self._hash
 
     def stream_name(self) -> str:
         return self._stream.name
@@ -363,83 +361,6 @@ def generate(self) -> Iterable[Partition]:
             )
 
 
-class CursorPartitionGenerator(PartitionGenerator):
-    """
-    This class generates partitions using the concurrent cursor and iterates through state slices to generate partitions.
-
-    It is used when synchronizing a stream in incremental or full-refresh mode where state information is maintained
-    across partitions. Each partition represents a subset of the stream's data and is determined by the cursor's state.
-    """
-
-    _START_BOUNDARY = 0
-    _END_BOUNDARY = 1
-
-    def __init__(
-        self,
-        stream: Stream,
-        message_repository: MessageRepository,
-        cursor: Cursor,
-        connector_state_converter: DateTimeStreamStateConverter,
-        cursor_field: Optional[List[str]],
-        slice_boundary_fields: Optional[Tuple[str, str]],
-    ):
-        """
-        Initialize the CursorPartitionGenerator with a stream, sync mode, and cursor.
-
-        :param stream: The stream to delegate to for partition generation.
-        :param message_repository: The message repository to use to emit non-record messages.
-        :param sync_mode: The synchronization mode.
-        :param cursor: A Cursor object that maintains the state and the cursor field.
-        """
-        self._stream = stream
-        self.message_repository = message_repository
-        self._sync_mode = SyncMode.full_refresh
-        self._cursor = cursor
-        self._cursor_field = cursor_field
-        self._state = self._cursor.state
-        self._slice_boundary_fields = slice_boundary_fields
-        self._connector_state_converter = connector_state_converter
-
-    def generate(self) -> Iterable[Partition]:
-        """
-        Generate partitions based on the slices in the cursor's state.
-
-        This method iterates through the list of slices found in the cursor's state, and for each slice, it generates
-        a `StreamPartition` object.
-
-        :return: An iterable of StreamPartition objects.
-        """
-
-        start_boundary = (
-            self._slice_boundary_fields[self._START_BOUNDARY]
-            if self._slice_boundary_fields
-            else "start"
-        )
-        end_boundary = (
-            self._slice_boundary_fields[self._END_BOUNDARY]
-            if self._slice_boundary_fields
-            else "end"
-        )
-
-        for slice_start, slice_end in self._cursor.generate_slices():
-            stream_slice = StreamSlice(
-                partition={},
-                cursor_slice={
-                    start_boundary: self._connector_state_converter.output_format(slice_start),
-                    end_boundary: self._connector_state_converter.output_format(slice_end),
-                },
-            )
-
-            yield StreamPartition(
-                self._stream,
-                copy.deepcopy(stream_slice),
-                self.message_repository,
-                self._sync_mode,
-                self._cursor_field,
-                self._state,
-            )
-
-
 @deprecated(
     "Availability strategy has been soft deprecated. Do not use. Class is subject to removal",
     category=ExperimentalClassWarning,

airbyte_cdk/sources/streams/concurrent/cursor.py

@@ -11,9 +11,11 @@
 from airbyte_cdk.sources.streams import NO_CURSOR_STATE_KEY
 from airbyte_cdk.sources.streams.concurrent.partitions.partition import Partition
 from airbyte_cdk.sources.streams.concurrent.partitions.record import Record
+from airbyte_cdk.sources.streams.concurrent.partitions.stream_slicer import StreamSlicer
 from airbyte_cdk.sources.streams.concurrent.state_converters.abstract_stream_state_converter import (
     AbstractStreamStateConverter,
 )
+from airbyte_cdk.sources.types import StreamSlice
 
 
 def _extract_value(mapping: Mapping[str, Any], path: List[str]) -> Any:
@@ -61,7 +63,7 @@ def extract_value(self, record: Record) -> CursorValueType:
         return cursor_value  # type: ignore  # we assume that the value the path points at is a comparable
 
 
-class Cursor(ABC):
+class Cursor(StreamSlicer, ABC):
     @property
     @abstractmethod
     def state(self) -> MutableMapping[str, Any]: ...
@@ -88,12 +90,12 @@ def ensure_at_least_one_state_emitted(self) -> None:
         """
         raise NotImplementedError()
 
-    def generate_slices(self) -> Iterable[Tuple[Any, Any]]:
+    def stream_slices(self) -> Iterable[StreamSlice]:
         """
         Default placeholder implementation of generate_slices.
         Subclasses can override this method to provide actual behavior.
         """
-        yield from ()
+        yield StreamSlice(partition={}, cursor_slice={})
 
 
 class FinalStateCursor(Cursor):
@@ -184,8 +186,8 @@ def cursor_field(self) -> CursorField:
         return self._cursor_field
 
     @property
-    def slice_boundary_fields(self) -> Optional[Tuple[str, str]]:
-        return self._slice_boundary_fields
+    def _slice_boundary_fields_wrapper(self) -> Tuple[str, str]:
+        return self._slice_boundary_fields if self._slice_boundary_fields else (self._connector_state_converter.START_KEY, self._connector_state_converter.END_KEY)
 
     def _get_concurrent_state(
         self, state: MutableMapping[str, Any]
@@ -299,7 +301,7 @@ def ensure_at_least_one_state_emitted(self) -> None:
         """
         self._emit_state_message()
 
-    def generate_slices(self) -> Iterable[Tuple[CursorValueType, CursorValueType]]:
+    def stream_slices(self) -> Iterable[StreamSlice]:
         """
         Generating slices based on a few parameters:
         * lookback_window: Buffer to remove from END_KEY of the highest slice
@@ -368,7 +370,7 @@ def _calculate_lower_boundary_of_last_slice(
 
     def _split_per_slice_range(
         self, lower: CursorValueType, upper: CursorValueType, upper_is_end: bool
-    ) -> Iterable[Tuple[CursorValueType, CursorValueType]]:
+    ) -> Iterable[StreamSlice]:
         if lower >= upper:
             return
 
@@ -377,10 +379,14 @@ def _split_per_slice_range(
 
         lower = max(lower, self._start) if self._start else lower
         if not self._slice_range or self._evaluate_upper_safely(lower, self._slice_range) >= upper:
-            if self._cursor_granularity and not upper_is_end:
-                yield lower, upper - self._cursor_granularity
-            else:
-                yield lower, upper
+            start_value, end_value = (lower, upper - self._cursor_granularity) if self._cursor_granularity and not upper_is_end else (lower, upper)
+            yield StreamSlice(
+                partition={},
+                cursor_slice={
+                    self._slice_boundary_fields_wrapper[self._START_BOUNDARY]: self._connector_state_converter.output_format(start_value),
+                    self._slice_boundary_fields_wrapper[self._END_BOUNDARY]: self._connector_state_converter.output_format(end_value)
+                }
+            )
         else:
             stop_processing = False
             current_lower_boundary = lower
@@ -389,12 +395,15 @@ def _split_per_slice_range(
                     self._evaluate_upper_safely(current_lower_boundary, self._slice_range), upper
                 )
                 has_reached_upper_boundary = current_upper_boundary >= upper
-                if self._cursor_granularity and (
-                    not upper_is_end or not has_reached_upper_boundary
-                ):
-                    yield current_lower_boundary, current_upper_boundary - self._cursor_granularity
-                else:
-                    yield current_lower_boundary, current_upper_boundary
+
+                start_value, end_value = (current_lower_boundary, current_upper_boundary - self._cursor_granularity) if self._cursor_granularity and (not upper_is_end or not has_reached_upper_boundary) else (current_lower_boundary, current_upper_boundary)
+                yield StreamSlice(
+                    partition={},
+                    cursor_slice={
+                        self._slice_boundary_fields_wrapper[self._START_BOUNDARY]: self._connector_state_converter.output_format(start_value),
+                        self._slice_boundary_fields_wrapper[self._END_BOUNDARY]: self._connector_state_converter.output_format(end_value)
+                    }
+                )
                 current_lower_boundary = current_upper_boundary
                 if current_upper_boundary >= upper:
                     stop_processing = True

airbyte_cdk/sources/streams/concurrent/partitions/stream_slicer.py

@@ -0,0 +1,21 @@
+# Copyright (c) 2024 Airbyte, Inc., all rights reserved.
+
+from abc import ABC, abstractmethod
+from typing import Iterable
+
+from airbyte_cdk.sources.types import StreamSlice
+
+
+class StreamSlicer(ABC):
+    """
+    Slices the stream into chunks that can be fetched independently. Slices enable state checkpointing and data retrieval parallelization.
+    """
+
+    @abstractmethod
+    def stream_slices(self) -> Iterable[StreamSlice]:
+        """
+        Defines stream slices
+
+        :return: An iterable of stream slices
+        """
+        pass