Collaborative session implementation, 1

2026-02-15 16:41:48 -08:00
commit 2f3c14a9b2
25 changed files with 2824 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,10 @@
+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+
+# Virtual environments
+.venv
--- a/.python-version
+++ b/.python-version
@@ -0,0 +1 @@
+3.13
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "python.analysis.typeCheckingMode": "standard"
+}
--- a/NOTES.md
+++ b/NOTES.md
@@ -0,0 +1,3 @@
+To create a Typescript app with Preact
+
+npm create vite@latest frontend -- --template preact-ts
--- a/README.md
+++ b/README.md
--- a/frontend/.gitignore
+++ b/frontend/.gitignore
@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>frontend</title>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -0,0 +1,24 @@
+{
+  "name": "frontend",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "preact": "^10.27.2",
+    "uuidv7": "^1.1.0"
+  },
+  "devDependencies": {
+    "@preact/preset-vite": "^2.10.2",
+    "@types/node": "^24.10.1",
+    "typescript": "~5.9.3",
+    "vite": "^8.0.0-beta.13"
+  },
+  "overrides": {
+    "vite": "^8.0.0-beta.13"
+  }
+}
--- a/frontend/public/vite.svg
+++ b/frontend/public/vite.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>
--- a/frontend/src/app.css
+++ b/frontend/src/app.css
@@ -0,0 +1,25 @@
+#app {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+.logo {
+  height: 6em;
+  padding: 1.5em;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #646cffaa);
+}
+.logo.preact:hover {
+  filter: drop-shadow(0 0 2em #673ab8aa);
+}
+
+.card {
+  padding: 2em;
+}
+
+.read-the-docs {
+  color: #888;
+}
--- a/frontend/src/app.tsx
+++ b/frontend/src/app.tsx
@@ -0,0 +1,263 @@
+import { useCallback, useEffect, useRef, useState } from 'preact/hooks'
+import './app.css'
+import { uuidv7 } from 'uuidv7'
+import { useSyncExternalStore, version } from 'preact/compat'
+
+const UPDATE_ENDPOINT = "http://localhost:8000/update"
+const EVENTS_ENDPOINT = "http://localhost:8000/events"
+
+type Snapshot = { cursor: number, values: Record<string, RRecord> }
+type LocalTweak = { cursor: number, tweak: Update };
+
+type ObjectId = string;
+type RNull = { type: "null", id: ObjectId };
+type RUser = { type: "user", id: ObjectId; name: string; }
+type RMessage = { type: "message", id: ObjectId; sender: string, content: string }
+type RRecord = RNull | RUser | RMessage;
+
+type CTrue = { type: "true" }
+type CEquivalentTo = { type: "equivalent_to", expected: RRecord }
+type Condition = CTrue | CEquivalentTo;
+
+type Update = {
+  condition: Condition,
+  new: RRecord,
+}
+type UpdateResult = {
+  index: number,
+}
+
+class Tracker {
+  #remoteCursor: number
+  #remoteValues: Record<string, RRecord>
+  #localTweaks: LocalTweak[];
+  #mergedSnapshot: Record<string, RRecord>
+  #stopListening: (() => void) | null;
+  #onChangedCallbacks: (() => void)[];
+
+  constructor() {
+    this.#remoteCursor = 0;
+    this.#remoteValues = {};
+    this.#localTweaks = [];
+    this.#mergedSnapshot = {};
+    this.#stopListening = null;
+    this.#onChangedCallbacks = [];
+  }
+
+  start() {
+    if (this.#stopListening != null) {
+      throw "already started!";
+    }
+    let body = async() => {
+      while (true) {
+        if (cancellation.canceled) { return; }
+        let result = await fetch(EVENTS_ENDPOINT + "?" + new URLSearchParams({ start: this.#remoteCursor.toString() }).toString(),
+          {
+            method: "GET",
+          }
+        );
+        let versions: RRecord[] = await result.json();
+        for (let version of versions) {
+          console.log(`Got version: ${JSON.stringify(version)}`)
+          this.#remoteCursor += 1;
+          this.#remoteValues[version.id] = version;
+        }
+        if (versions.length > 0) {
+          console.log("Local tweaks before:");
+          console.log(this.#localTweaks);
+          this.#localTweaks = this.#localTweaks.filter((i) => i.cursor >= this.#remoteCursor);
+          console.log("Local tweaks after:");
+          console.log(this.#localTweaks);
+          this.#rebuildSnapshot();
+        }
+      }
+    }
+    var cancellation = { canceled: false };
+    this.#stopListening = () => { cancellation.canceled = true; };
+    body();
+  }
+
+  stop() {
+    if (this.#stopListening == null) {
+      throw "never started";
+    }
+    this.#stopListening();
+  }
+
+  async sendUpdate(update: Update) {
+    let tweak = {
+      cursor: Number.MAX_SAFE_INTEGER,
+      tweak: update,
+    };
+    this.#localTweaks.push(tweak);
+    this.#rebuildSnapshot();
+    let result = await fetch(UPDATE_ENDPOINT, {
+      method: "POST",
+      body: JSON.stringify(update)
+    });
+    if (result.status == 409) {
+      let ix = this.#localTweaks.indexOf(tweak);
+      if (ix > -1) {
+        this.#localTweaks.splice(ix, 1);
+      } else {
+        throw new Error("tweak unexpectedly disappeared");
+      }
+      this.#rebuildSnapshot();
+    } else {
+      let updateResult: UpdateResult = await result.json();
+      console.log("updateResult: ")
+      console.log(updateResult)
+      tweak.cursor = updateResult.index;
+      this.#localTweaks.sort((a, b) => a.cursor - b.cursor);
+      this.#rebuildSnapshot();
+    }
+  }
+
+  #rebuildSnapshot() {
+    let newSnapshot = {...this.#remoteValues};
+    for (var i of this.#localTweaks) {
+      if (i.tweak.new.type == "null") {
+        delete newSnapshot[i.tweak.new.id]
+      } else {
+        newSnapshot[i.tweak.new.id] = i.tweak.new;
+      }
+    }
+    this.#mergedSnapshot = newSnapshot;
+    for (var cb of this.#onChangedCallbacks) {
+      cb();
+    }
+  }
+
+  getSnapshot() {
+    return this.#mergedSnapshot;
+  }
+
+  onChanged(cb: () => void) {
+    this.#onChangedCallbacks.push(cb);
+  }
+}
+
+export function useTrack() {
+  const store = useRef(new Tracker());
+  const subscribe = useCallback(
+    (callback: () => void) => { store.current.onChanged(callback); store.current.start(); return () => store.current.stop(); },
+    [store.current]
+  )
+  const snapshot = useSyncExternalStore(
+    subscribe,
+    () => { return store.current.getSnapshot(); }
+  )
+  const sendUpdate = (update: Update) => store.current.sendUpdate(update);
+
+  return {
+    snapshot,
+    sendUpdate
+  };
+}
+
+export function App() {
+  const [identity, setIdentity] = useState<string | null>(null);
+  if (identity == null) {
+    return <>
+      <p>Please set your name!</p>
+      <Editor content="" onDone={setIdentity}></Editor>
+    </>
+  }
+  return <>
+    <Chat name={identity}></Chat>
+  </>
+}
+export function Chat({name}: {name: string}) {
+  const [me, setMe] = useState(uuidv7());
+  const {snapshot, sendUpdate} = useTrack()
+
+  useEffect(() => {
+    sendUpdate({
+      condition: { type: "true" },
+      new: {
+        type: "user",
+        id: me,
+        name: name,
+      }
+    })
+  }, [])
+
+  const sendMessage = (message: string) => {
+    sendUpdate({
+      condition: { type: "true" },
+      new: {
+        type: "message",
+        id: uuidv7(),
+        sender: me,
+        content: message,
+      }
+    })
+  }
+
+  const users = Object.values(snapshot).filter((i) => i.type == "user").sort((a, b) => a.id.localeCompare(b.id));
+  const messages = Object.values(snapshot).filter((i) => i.type == "message").sort((a, b) => a.id.localeCompare(b.id));
+
+  let usersByName: Record<string, string> = {};
+  for (var u of users) {
+    usersByName[u.id] = u.name;
+  }
+  console.log(usersByName);
+
+  return <>
+    <h1>Users</h1>
+    <ul>
+      {users.map((i) => <li key={i.id}>{i.name}</li>)}
+    </ul>
+    <h1>Messages</h1>
+    {messages.map((m) => <Message key={m.id} me={me} message={m} usersByName={usersByName} sendUpdate={sendUpdate}></Message>
+    )}
+    <Editor content={""} onDone={sendMessage}></Editor>
+  </>
+}
+
+export function Message({
+  me,
+  message,
+  usersByName,
+  sendUpdate,
+}: {
+  me: string,
+  message: RMessage,
+  usersByName: Record<string, string>,
+  sendUpdate: (update: Update) => void
+}) {
+  const [isEditing, setIsEditing] = useState(false)
+  const submitNewContent = (newContent: string) => {
+    sendUpdate(
+      {
+        condition: {type: "true"},
+        new: {
+          type: "message",
+          id: message.id,
+          sender: me,
+          content: newContent,
+        }
+      }
+    );
+    setIsEditing(false);
+  }
+
+  return <div>
+    <span>({usersByName[message.sender]}) 
+      {isEditing ? <> 
+        <Editor content={message.content} onDone={submitNewContent} ></Editor>
+      </> : <>{ message.content }</>}
+      {(message.sender == me) && <a onClick={() => setIsEditing(!isEditing)}>EDIT</a>}
+    </span>
+  </div>;
+
+}
+
+export function Editor({ content, onDone }: {content: string, onDone: (content: string) => void }) {
+  const [currentContent, setCurrentContent] = useState(content);
+  return <input onChange={(e) => setCurrentContent(e.currentTarget.value)} onKeyDown={(e) => {
+      if (e.key == "Enter") { onDone(currentContent) ; }
+      setCurrentContent("");
+    }}>
+    </input>
+}
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -0,0 +1,68 @@
+:root {
+  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+
+  color-scheme: light dark;
+  color: rgba(255, 255, 255, 0.87);
+  background-color: #242424;
+
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+a {
+  font-weight: 500;
+  color: #646cff;
+  text-decoration: inherit;
+}
+a:hover {
+  color: #535bf2;
+}
+
+body {
+  margin: 0;
+  display: flex;
+  place-items: center;
+  min-width: 320px;
+  min-height: 100vh;
+}
+
+h1 {
+  font-size: 3.2em;
+  line-height: 1.1;
+}
+
+button {
+  border-radius: 8px;
+  border: 1px solid transparent;
+  padding: 0.6em 1.2em;
+  font-size: 1em;
+  font-weight: 500;
+  font-family: inherit;
+  background-color: #1a1a1a;
+  cursor: pointer;
+  transition: border-color 0.25s;
+}
+button:hover {
+  border-color: #646cff;
+}
+button:focus,
+button:focus-visible {
+  outline: 4px auto -webkit-focus-ring-color;
+}
+
+@media (prefers-color-scheme: light) {
+  :root {
+    color: #213547;
+    background-color: #ffffff;
+  }
+  a:hover {
+    color: #747bff;
+  }
+  button {
+    background-color: #f9f9f9;
+  }
+}
--- a/frontend/src/main.tsx
+++ b/frontend/src/main.tsx
@@ -0,0 +1,5 @@
+import { render } from 'preact'
+import './index.css'
+import { App } from './app.tsx'
+
+render(<App />, document.getElementById('app')!)
--- a/frontend/tsconfig.app.json
+++ b/frontend/tsconfig.app.json
@@ -0,0 +1,33 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
+    "target": "ES2022",
+    "useDefineForClassFields": true,
+    "module": "ESNext",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "types": ["vite/client"],
+    "skipLibCheck": true,
+    "paths": {
+      "react": ["./node_modules/preact/compat/"],
+      "react-dom": ["./node_modules/preact/compat/"]
+    },
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "jsxImportSource": "preact",
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["src"]
+}
--- a/frontend/tsconfig.json
+++ b/frontend/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
+}
--- a/frontend/tsconfig.node.json
+++ b/frontend/tsconfig.node.json
@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
+    "target": "ES2023",
+    "lib": ["ES2023"],
+    "module": "ESNext",
+    "types": ["node"],
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["vite.config.ts"]
+}
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -0,0 +1,7 @@
+import { defineConfig } from 'vite'
+import preact from '@preact/preset-vite'
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [preact()],
+})
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -0,0 +1,11 @@
+[project]
+name = "syncing-1"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+requires-python = ">=3.13"
+dependencies = [
+    "pydantic>=2.12.5",
+    "starlette>=0.52.1",
+    "uvicorn>=0.40.0",
+]
--- a/synctoy/data_model.py
+++ b/synctoy/data_model.py
@@ -0,0 +1,94 @@
+from enum import Enum, StrEnum
+from typing import Literal, NewType
+
+from pydantic import BaseModel, JsonValue
+
+from synctoy.state_machine import StateMachine
+
+
+class Type(StrEnum):
+    Null = "null"
+    User = "user"
+    Message = "message"
+
+ObjectId = NewType("ObjectId", str)
+
+class RNull(BaseModel):
+    type: Literal[Type.Null] = Type.Null
+    id: ObjectId
+
+    def equivalent_to(self, other: StateMachine):
+        return self == other
+
+    def can_transition_from(self, old: StateMachine):
+        return True
+
+    def can_transition_to(self, new: StateMachine):
+        return True
+
+class RUser(BaseModel):
+    type: Literal[Type.User] = Type.User
+    id: ObjectId
+    name: str
+
+    def equivalent_to(self, other: StateMachine):
+        return self == other
+
+    def can_transition_from(self, old: StateMachine):
+        if isinstance(old, RNull):
+            return True
+        return False
+
+    def can_transition_to(self, new: StateMachine):
+        return False
+
+class RMessage(BaseModel):
+    type: Literal[Type.Message] = Type.Message
+    id: ObjectId
+    sender: ObjectId
+    content: str
+
+    def equivalent_to(self, other: StateMachine):
+        return self == other
+
+    def can_transition_from(self, old: StateMachine):
+        if isinstance(old, RNull):
+            return True
+        if isinstance(old, RMessage):
+            return True
+        return False
+
+    def can_transition_to(self, new: StateMachine):
+        if isinstance(new, RMessage):
+            return new.sender == self.sender
+        return True
+
+NonNullRecord = RUser | RMessage
+Record = RNull | NonNullRecord
+
+
+
+def as_state_machine(r: Record) -> StateMachine:
+    return r
+
+
+class ConditionType(StrEnum):
+    True_ = "true"
+    EquivalentTo = "equivalent_to"
+
+
+class CTrue(BaseModel):
+    type: Literal[ConditionType.True_] = ConditionType.True_
+
+    def is_met(self, old: Record, new: Record):
+        return True
+
+class CEquivalentTo(BaseModel):
+    type: Literal[ConditionType.EquivalentTo] = ConditionType.EquivalentTo
+
+    expected: Record
+
+    def is_met(self, old: Record, new: Record):
+        return old.equivalent_to(self.expected)
+
+Condition = CTrue | CEquivalentTo
--- a/synctoy/main.py
+++ b/synctoy/main.py
@@ -0,0 +1,55 @@
+import asyncio
+import json
+from pydantic import BaseModel, TypeAdapter
+from starlette.applications import Starlette
+from starlette.middleware import Middleware
+from starlette.middleware.cors import CORSMiddleware
+from starlette.middleware.trustedhost import TrustedHostMiddleware
+from starlette.requests import Request
+from starlette.responses import JSONResponse, Response
+from starlette.routing import Route
+
+from synctoy.data_model import ObjectId, NonNullRecord, Record
+from synctoy.snapshot import SAll
+from synctoy.store import Store, Update
+
+
+store = Store()
+
+_TIMEOUT = 5.0
+
+async def snapshot(request: Request):
+    snapshot = store.snapshot(SAll())
+    populated = snapshot.populated_records()
+    return JSONResponse(TypeAdapter(dict[ObjectId, NonNullRecord]).dump_python(populated, mode="json"))
+
+class UpdateResult(BaseModel):
+    index: int
+
+async def update(request: Request):
+    value = Update.model_validate_json(await request.body())
+    version = store.update([value])
+    return JSONResponse(UpdateResult(index=version).model_dump(mode="json"))
+
+async def events(request: Request):
+    start = request.query_params.get("start")
+    if start is None:
+        start = 0
+    else:
+        start = int(start)
+
+    result = store.observe(start_from=start)
+    if len(result) == 0:
+        await store.wait(_TIMEOUT)
+        result = store.observe(start_from=start)
+
+    await asyncio.sleep(1.0)  # simulated delay! wow
+    return JSONResponse(TypeAdapter(list[Record]).dump_python(result))
+
+app = Starlette(debug=True, routes=[
+    Route("/snapshot", snapshot, methods=["GET"]),
+    Route("/update", update, methods=["POST"]),
+    Route("/events", events, methods=["GET"])
+],
+)
+app = CORSMiddleware(app=app, allow_origins=["*"])
--- a/synctoy/snapshot.py
+++ b/synctoy/snapshot.py
@@ -0,0 +1,43 @@
+from typing import Protocol
+
+from synctoy.data_model import NonNullRecord, ObjectId, RNull, Record
+
+
+class Selector(Protocol):
+    def includes_object_id(self, object_id: ObjectId):
+        raise NotImplementedError
+
+
+class SAll(object):
+    def includes_object_id(self, object_id: ObjectId):
+        return True
+
+class SList(object):
+    def __init__(self, object_ids: list[ObjectId]):
+        self._object_ids = object_ids
+
+    def includes_object_id(self, object_id: ObjectId):
+        return object_id in self._object_ids
+
+class Snapshot(object):
+    def __init__(self, selector: Selector, data: dict[ObjectId, NonNullRecord]):
+        self._selector = selector
+        self._data = data
+
+    def __getitem__(self, object_id: ObjectId):
+        if not self._selector.includes_object_id(object_id):
+            raise KeyError(f"{object_id} was not selected and cannot be viewed")
+
+        return self._data.get(object_id) or RNull(id=object_id)
+
+    def __setitem__(self, object_id: ObjectId, value: Record):
+        if not self._selector.includes_object_id(object_id):
+            raise KeyError(f"{object_id} was not selected and cannot be staged")
+
+        if isinstance(value, RNull):
+            self._data.pop(object_id, None)
+        else:
+            self._data[object_id] = value
+
+    def populated_records(self) -> dict[ObjectId, NonNullRecord]:
+        return dict(self._data)
--- a/synctoy/state_machine.py
+++ b/synctoy/state_machine.py
@@ -0,0 +1,12 @@
+from typing import Protocol
+
+
+class StateMachine(Protocol):
+    def equivalent_to(self, other: "StateMachine") -> bool:
+        raise NotImplementedError
+
+    def can_transition_from(self, old: "StateMachine") -> bool:
+        raise NotImplementedError
+
+    def can_transition_to(self, new: "StateMachine") -> bool:
+        raise NotImplementedError
--- a/synctoy/store.py
+++ b/synctoy/store.py
@@ -0,0 +1,65 @@
+import asyncio
+from typing import NewType, Protocol
+from pydantic import BaseModel, JsonValue
+
+from synctoy.data_model import Condition, NonNullRecord, ObjectId, RNull, Record
+from synctoy.snapshot import SList, Selector, Snapshot
+
+class Update(BaseModel):
+    condition: Condition
+    new: Record
+
+class PreconditionException(Exception):
+    pass
+
+class Store(object):
+    def __init__(self):
+        self._event = asyncio.Event()
+        self._versions: list[Record] = []
+
+    async def wait(self, max_timeout: float):
+        try:
+            await asyncio.wait_for(self._event.wait(), max_timeout)
+        except TimeoutError:
+            return
+
+    def observe(self, start_from: int):
+        return self._versions[start_from:]
+
+    def update(self, updates: list[Update]) -> int:
+        object_ids: set[ObjectId] = set(u.new.id for u in updates)
+        snapshot: Snapshot = self.snapshot(SList(object_ids=list(object_ids)))
+
+        for update in updates:
+            id = update.new.id
+            old_object = snapshot[id] 
+            new_object = update.new
+
+            if not old_object.can_transition_to(new_object):
+                raise PreconditionException(f"can't transition from {old_object} to {new_object}")
+            if not new_object.can_transition_from(old_object):
+                raise PreconditionException(f"can't transition from {old_object} to {new_object}")
+
+            if not update.condition.is_met(old_object, new_object):
+                raise PreconditionException(f"failed condition: {update.condition}")
+
+            snapshot[id] = new_object
+            
+        for new_update in updates:
+            self._versions.append(new_update.new)
+        self._event.set()
+        self._event = asyncio.Event()
+        return len(self._versions)
+
+    def snapshot(self, selector: Selector) -> Snapshot:
+        pre_snapshot: dict[ObjectId, Record] = {}
+        for row in self._versions:
+            if not selector.includes_object_id(row.id):
+                continue
+
+            pre_snapshot[row.id] = row
+        filtered: dict[ObjectId, NonNullRecord] = {
+            id: row for id, row in pre_snapshot.items() if not isinstance(row, RNull)
+        }
+        
+        return Snapshot(selector, filtered)
--- a/uv.lock
+++ b/uv.lock
@@ -0,0 +1,194 @@
+version = 1
+revision = 2
+requires-python = ">=3.13"
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