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Python implementation of [Earthstar](
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"""A share driver that stores data in memory
from typing import Dict, List, Tuple
from ..document import Document
from ..exc import ReplicaIsClosedError
from ..identity import Identity
from ..path import Path
from ..query import HistoryMode, Query
from ..share import Share
from . import Replica
class InMemoryReplica(Replica):
"""In-memory Replica"""
def __init__(self, share: Share, **driver_kwargs) -> None:
self.share = share
self._is_closed = False
self._max_local_index = -1
# Local Index <=> Document pairs
self._documents: List[Tuple[int, Document]] = {}
def is_closed(self) -> bool:
return self._is_closed
def close(self, erase: bool = False) -> None:
if self._is_closed:
raise ReplicaIsClosedError()
if erase:
self._local_index = -1
self._documents = []
self._is_closed = True
def max_local_index(self) -> int:
if self._is_closed:
raise ReplicaIsClosedError()
return self._max_local_index
def _get_all_docs(self) -> List[Document]:
"""Get all documents"""
if self._is_closed:
raise ReplicaIsClosedError()
return [document for _, document in self._documents]
def _get_latest_docs(self) -> List[Document]:
"""Get the latest version of each document"""
if self._is_closed:
raise ReplicaIsClosedError()
docs_by_path: Dict[str, Document] = {}
for document in self._documents:
if (
str(document.path) not in docs_by_path
or docs_by_path[str(document.path)].timestamp <= document.timestamp
docs_by_path[str(document.path)] = document
return list(docs_by_path.values())
def query_docs(self, query: Query) -> List[Document]:
"""Query a list of documents"""
if self._is_closed:
raise ReplicaIsClosedError()
if query.history_mode == HistoryMode.ALL:
docs = self._get_all_docs()
docs = self._get_latest_docs()
docs_to_local_index = {
document: local_index for document, local_index in self.docs_by_local_index
return query({docs_to_local_index[document]: document for document in docs})
def upsert(self, new_document: Document) -> None:
if self._is_closed:
raise ReplicaIsClosedError()
self._max_local_index += 1
self._documents = [
(local_index, document)
for local_index, document in self._documents
if != or document.path != new_document.path
self._documents.append((self._local_index, new_document))