[fabric/sqlite-store] Implement SQLiteEventStore

packages/fabric/sqlite-store/src/events/event-store.spec.ts

@@ -0,0 +1,77 @@
+import { PosixDate, Run } from "@fabric/core";
+import { Event } from "@fabric/domain";
+import { UUIDGeneratorMock } from "@fabric/domain/mocks";
+import { afterEach, beforeEach, describe, expect, it, vitest } from "vitest";
+import { SQLiteEventStore } from "./event-store.js";
+
+describe("Event Store", () => {
+  type UserCreated = Event<"UserCreated", { name: string }>;
+  type UserUpdated = Event<"UserUpdated", { name: string }>;
+  type UserDeleted = Event<"UserDeleted", void>;
+
+  type UserEvents = UserCreated | UserUpdated | UserDeleted;
+
+  let store: SQLiteEventStore<UserEvents>;
+
+  beforeEach(async () => {
+    store = new SQLiteEventStore(":memory:");
+    await Run.UNSAFE(() => store.migrate());
+  });
+
+  afterEach(async () => {
+    await Run.UNSAFE(() => store.close());
+  });
+
+  it("Should append an event", async () => {
+    const newUUID = UUIDGeneratorMock.generate();
+
+    const userCreated: UserCreated = {
+      type: "UserCreated",
+      id: newUUID,
+      streamId: newUUID,
+      payload: { name: "test" },
+    };
+
+    await Run.UNSAFE(() => store.append(userCreated));
+
+    const events = await Run.UNSAFE(() => store.getEventsFromStream(newUUID));
+
+    expect(events).toHaveLength(1);
+
+    expect(events[0]).toEqual({
+      id: newUUID,
+      streamId: newUUID,
+      type: "UserCreated",
+      version: BigInt(1),
+      timestamp: expect.any(PosixDate),
+      payload: { name: "test" },
+    });
+  });
+
+  it("should notify subscribers on append", async () => {
+    const newUUID = UUIDGeneratorMock.generate();
+
+    const userCreated: UserCreated = {
+      type: "UserCreated",
+      id: newUUID,
+      streamId: newUUID,
+      payload: { name: "test" },
+    };
+
+    const subscriber = vitest.fn();
+
+    store.subscribe(["UserCreated"], subscriber);
+
+    await Run.UNSAFE(() => store.append(userCreated));
+
+    expect(subscriber).toHaveBeenCalledTimes(1);
+    expect(subscriber).toHaveBeenCalledWith({
+      id: newUUID,
+      streamId: newUUID,
+      type: "UserCreated",
+      version: BigInt(1),
+      timestamp: expect.any(PosixDate),
+      payload: { name: "test" },
+    });
+  });
+});

packages/fabric/sqlite-store/src/events/event-store.ts

@@ -0,0 +1,176 @@
+import { AsyncResult, MaybePromise, PosixDate, Run } from "@fabric/core";
+import {
+  Event,
+  EventFromKey,
+  EventStore,
+  EventSubscriber,
+  JSONUtils,
+  StoredEvent,
+  StoreQueryError,
+  UUID,
+} from "@fabric/domain";
+import { SQLiteDatabase } from "../sqlite/sqlite-database.js";
+
+export class SQLiteEventStore<TEvents extends Event>
+  implements EventStore<TEvents>
+{
+  private db: SQLiteDatabase;
+
+  private streamVersions = new Map<UUID, bigint>();
+
+  private eventSubscribers = new Map<
+    TEvents["type"],
+    EventSubscriber<TEvents>[]
+  >();
+
+  constructor(private readonly dbPath: string) {
+    this.db = new SQLiteDatabase(dbPath);
+  }
+
+  async migrate(): AsyncResult<void, StoreQueryError> {
+    return AsyncResult.tryFrom(
+      async () => {
+        await this.db.init();
+        await this.db.run(
+          `CREATE TABLE IF NOT EXISTS events (
+              id TEXT PRIMARY KEY,
+              type TEXT NOT NULL,
+              streamId TEXT NOT NULL,
+              version INTEGER NOT NULL,
+              timestamp NUMERIC NOT NULL,
+              payload TEXT NOT NULL,
+              UNIQUE(streamId, version)
+            )`,
+        );
+      },
+      (error) => new StoreQueryError(error.message, { error }),
+    );
+  }
+
+  async getEventsFromStream(
+    streamId: UUID,
+  ): AsyncResult<StoredEvent<TEvents>[], StoreQueryError> {
+    return AsyncResult.tryFrom(
+      async () => {
+        const events = await this.db.allPrepared(
+          `SELECT * FROM events WHERE streamId = $id`,
+          {
+            $id: streamId,
+          },
+          (event) => ({
+            id: event.id,
+            streamId: event.streamId,
+            type: event.type,
+            version: BigInt(event.version),
+            timestamp: new PosixDate(event.timestamp),
+            payload: JSONUtils.parse(event.payload),
+          }),
+        );
+        return events;
+      },
+      (error) => new StoreQueryError(error.message, { error }),
+    );
+  }
+
+  async append<T extends TEvents>(
+    event: T,
+  ): AsyncResult<StoredEvent<T>, StoreQueryError> {
+    return Run.seq(
+      () => this.getLastVersion(event.streamId),
+      (version) =>
+        AsyncResult.from(() => {
+          this.streamVersions.set(event.streamId, version + 1n);
+          return version;
+        }),
+      (version) => this.storeEvent(event.streamId, version + 1n, event),
+      (storedEvent) =>
+        AsyncResult.from(async () => {
+          await this.notifySubscribers(storedEvent);
+          return storedEvent;
+        }),
+    );
+  }
+
+  private async notifySubscribers(
+    event: StoredEvent<TEvents>,
+  ): AsyncResult<void> {
+    return AsyncResult.from(async () => {
+      const subscribers = this.eventSubscribers.get(event.type) || [];
+      await Promise.all(subscribers.map((subscriber) => subscriber(event)));
+    });
+  }
+
+  private async getLastVersion(
+    streamId: UUID,
+  ): AsyncResult<bigint, StoreQueryError> {
+    return AsyncResult.tryFrom(
+      async () => {
+        const { lastVersion } = await this.db.onePrepared(
+          `SELECT max(version) as lastVersion FROM events WHERE streamId = $id`,
+          {
+            $id: streamId,
+          },
+        );
+
+        return !lastVersion ? 0n : BigInt(lastVersion);
+      },
+      (error) =>
+        new StoreQueryError(`Error getting last version:${error.message}`, {
+          error,
+        }),
+    );
+  }
+
+  subscribe<TEventKey extends TEvents["type"]>(
+    events: TEventKey[],
+    subscriber: (
+      event: StoredEvent<EventFromKey<TEvents, TEventKey>>,
+    ) => MaybePromise<void>,
+  ): void {
+    events.forEach((event) => {
+      const subscribers = this.eventSubscribers.get(event) || [];
+      const newSubscribers = [
+        ...subscribers,
+        subscriber,
+      ] as EventSubscriber<TEvents>[];
+      this.eventSubscribers.set(event, newSubscribers);
+    });
+  }
+
+  close(): AsyncResult<void, StoreQueryError> {
+    return AsyncResult.tryFrom(
+      () => this.db.close(),
+      (error) => new StoreQueryError(error.message, { error }),
+    );
+  }
+
+  private storeEvent<T extends Event>(
+    streamId: UUID,
+    version: bigint,
+    event: T,
+  ): AsyncResult<StoredEvent<T>, StoreQueryError> {
+    return AsyncResult.tryFrom(
+      async () => {
+        const storedEvent: StoredEvent<T> = {
+          ...event,
+          version: version,
+          timestamp: new PosixDate(),
+        };
+        await this.db.runPrepared(
+          `INSERT INTO events (id, streamId, type, version, timestamp, payload) 
+          VALUES ($id, $streamId, $type, $version, $timestamp, $payload)`,
+          {
+            $id: storedEvent.id,
+            $streamId: streamId,
+            $type: storedEvent.type,
+            $version: storedEvent.version.toString(),
+            $timestamp: storedEvent.timestamp.timestamp,
+            $payload: JSON.stringify(storedEvent.payload),
+          },
+        );
+        return storedEvent;
+      },
+      (error) => new StoreQueryError("Error appending event", { error }),
+    );
+  }
+}

packages/fabric/sqlite-store/src/events/index.ts

@@ -0,0 +1 @@
+export * from "./event-store.js";

packages/fabric/sqlite-store/src/sqlite/sqlite-database.ts

@@ -79,7 +79,11 @@ export class SQLiteDatabase {
           if (err) {
             reject(err);
           } else {
-            resolve(transformer ? rows.map(transformer) : rows);
+            try {
+              resolve(transformer ? rows.map(transformer) : rows);
+            } catch (e) {
+              reject(e);
+            }
           }
         },
       );
@@ -100,7 +104,11 @@ export class SQLiteDatabase {
           if (err) {
             reject(err);
           } else {
-            resolve(transformer ? rows.map(transformer)[0] : rows[0]);
+            try {
+              resolve(transformer ? rows.map(transformer)[0] : rows[0]);
+            } catch (e) {
+              reject(e);
+            }
           }
         },
       );

packages/fabric/sqlite-store/src/state/query-builder.ts

@@ -14,7 +14,7 @@ import {
 } from "@fabric/domain";
 import { filterToParams, filterToSQL } from "../sqlite/filter-to-sql.js";
 import { transformRow } from "../sqlite/sql-to-value.js";
-import { SQLiteDatabase } from "../sqlite/sqlite-wrapper.js";
+import { SQLiteDatabase } from "../sqlite/sqlite-database.js";
 
 export class QueryBuilder<T> implements StoreQuery<T> {
   constructor(

packages/fabric/sqlite-store/src/state/state-store.ts

@@ -16,7 +16,7 @@ import {
   recordToSQLParams,
   recordToSQLSet,
 } from "../sqlite/record-utils.js";
-import { SQLiteDatabase } from "../sqlite/sqlite-wrapper.js";
+import { SQLiteDatabase } from "../sqlite/sqlite-database.js";
 import { QueryBuilder } from "./query-builder.js";
 
 export class SQLiteStateStore<TModel extends Model>
@@ -26,7 +26,7 @@ export class SQLiteStateStore<TModel extends Model>
   private db: SQLiteDatabase;
 
   constructor(
-    private dbPath: string,
+    private readonly dbPath: string,
     models: TModel[],
   ) {
     this.schema = models.reduce((acc, model: TModel) => {