init app resources

app/src/core/drivers/cache/cache-driver-test-suite.ts

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+import type { TestRunner } from "core/test";
+import type { ICacheDriver } from "./index";
+
+export function cacheDriverTestSuite(
+   testRunner: TestRunner,
+   {
+      makeCache,
+      setTime,
+      options,
+   }: {
+      makeCache: () => ICacheDriver;
+      setTime: (ms: number) => void;
+      options?: {
+         minTTL?: number;
+         skipTTL?: boolean;
+      };
+   },
+) {
+   const { test, expect } = testRunner;
+   const minTTL = options?.minTTL ?? 0;
+
+   test("get within ttl", async () => {
+      const cache = makeCache();
+      await cache.set("ttl", "bar", minTTL + 2); // 2 second TTL
+      setTime(minTTL * 1000 + 1000); // advance by 1 second
+      expect(await cache.get("ttl")).toBe("bar");
+   });
+
+   test("set and get returns value", async () => {
+      const cache = makeCache();
+      await cache.set("value", "bar");
+      expect(await cache.get("value")).toBe("bar");
+   });
+
+   test("get returns undefined for missing key", async () => {
+      const cache = makeCache();
+      expect(await cache.get("missing" + Math.random())).toBeUndefined();
+   });
+
+   test("delete removes value", async () => {
+      const cache = makeCache();
+      await cache.set("delete", "bar");
+      await cache.del("delete");
+      expect(await cache.get("delete")).toBeUndefined();
+   });
+
+   test("set overwrites value", async () => {
+      const cache = makeCache();
+      await cache.set("overwrite", "bar");
+      await cache.set("overwrite", "baz");
+      expect(await cache.get("overwrite")).toBe("baz");
+   });
+
+   test("set with ttl expires", async () => {
+      const cache = makeCache();
+      await cache.set("expire", "bar", minTTL + 1); // 1 second TTL
+      expect(await cache.get("expire")).toBe("bar");
+      // advance time
+      setTime(minTTL * 1000 * 2000);
+      if (options?.skipTTL) {
+         await cache.del("expire");
+      }
+      expect(await cache.get("expire")).toBeUndefined();
+   });
+   test("set without ttl does not expire", async () => {
+      const cache = makeCache();
+      await cache.set("ttl0", "bar");
+      expect(await cache.get("ttl0")).toBe("bar");
+      setTime(1000);
+      expect(await cache.get("ttl0")).toBe("bar");
+   });
+}

app/src/core/drivers/cache/in-memory.spec.ts

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+import { cacheDriverTestSuite } from "./cache-driver-test-suite";
+import { cacheMemory } from "./in-memory";
+import { bunTestRunner } from "adapter/bun/test";
+import { setSystemTime, afterAll, beforeAll, test, expect, describe } from "bun:test";
+
+let baseTime = Date.now();
+
+beforeAll(() => {
+   baseTime = Date.now();
+   setSystemTime(new Date(baseTime));
+});
+
+afterAll(() => {
+   setSystemTime(); // Reset to real time
+});
+
+describe("InMemoryCacheDriver", () => {
+   cacheDriverTestSuite(bunTestRunner, {
+      makeCache: () => cacheMemory(),
+      setTime: (ms: number) => {
+         setSystemTime(new Date(baseTime + ms));
+      },
+   });
+
+   test("evicts least recently used entries by byte size", async () => {
+      // maxSize = 20 bytes for this test
+      const cache = cacheMemory({ maxSize: 20 });
+      // each key and value is 1 char = 1 byte (ASCII)
+      // totals to 2 bytes each
+      await cache.set("a", "1");
+      await cache.set("b", "2");
+      await cache.set("c", "3");
+      await cache.set("d", "4");
+      await cache.set("e", "5");
+      // total: 10 bytes
+      // now add a large value to force eviction
+      await cache.set("big", "1234567890");
+      // should evict least recently used entries until it fits
+      // only "big" and possibly one other small entry should remain
+      expect(await cache.get("big")).toBe("1234567890");
+      // the oldest keys should be evicted
+      expect(await cache.get("a")).toBeUndefined();
+      expect(await cache.get("b")).toBeUndefined();
+      // the most recent small keys may or may not remain depending on eviction order
+   });
+
+   test("throws if entry is too large to ever fit", async () => {
+      const cache = cacheMemory({ maxSize: 5 });
+      // key: 3, value: 10 = 13 bytes
+      expect(cache.set("big", "1234567890")).rejects.toThrow();
+   });
+});

app/src/core/drivers/cache/in-memory.ts

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+import type { ICacheDriver } from "./index";
+
+interface InMemoryCacheOptions {
+   // maximum total size in bytes for all keys and values
+   maxSize?: number;
+   // default time-to-live in seconds
+   defaultTTL?: number;
+}
+
+interface CacheEntry {
+   value: string;
+   // timestamp in ms, or null for no expiry
+   expiresAt: number | null;
+   // size in bytes of this entry (key + value)
+   size: number;
+}
+
+function byteLength(str: string): number {
+   return new TextEncoder().encode(str).length;
+}
+
+export class InMemoryCacheDriver implements ICacheDriver {
+   protected cache: Map<string, CacheEntry>;
+   protected maxSize: number;
+   protected defaultTTL: number;
+   protected currentSize: number;
+
+   constructor(options: InMemoryCacheOptions = {}) {
+      this.maxSize = options.maxSize ?? 1024 * 1024 * 10; // 10MB default
+      this.defaultTTL = options.defaultTTL ?? 60 * 60; // 1 hour default
+      this.cache = new Map();
+      this.currentSize = 0;
+   }
+
+   protected now(): number {
+      return Date.now();
+   }
+
+   protected isExpired(entry: CacheEntry): boolean {
+      return entry.expiresAt !== null && entry.expiresAt <= this.now();
+   }
+
+   protected setEntry(key: string, entry: CacheEntry) {
+      const oldEntry = this.cache.get(key);
+      const oldSize = oldEntry ? oldEntry.size : 0;
+      let projectedSize = this.currentSize - oldSize + entry.size;
+
+      // if the entry itself is too large, throw
+      if (entry.size > this.maxSize) {
+         throw new Error(
+            `InMemoryCacheDriver: entry too large (entry: ${entry.size}, max: ${this.maxSize})`,
+         );
+      }
+
+      // evict LRU until it fits
+      while (projectedSize > this.maxSize && this.cache.size > 0) {
+         // remove least recently used (first inserted)
+         const lruKey = this.cache.keys().next().value;
+         if (typeof lruKey === "string") {
+            const lruEntry = this.cache.get(lruKey);
+            if (lruEntry) {
+               this.currentSize -= lruEntry.size;
+            }
+            this.cache.delete(lruKey);
+            projectedSize = this.currentSize - oldSize + entry.size;
+         } else {
+            break;
+         }
+      }
+
+      if (projectedSize > this.maxSize) {
+         throw new Error(
+            `InMemoryCacheDriver: maxSize exceeded after eviction (attempted: ${projectedSize}, max: ${this.maxSize})`,
+         );
+      }
+
+      if (oldEntry) {
+         this.currentSize -= oldSize;
+      }
+      this.cache.delete(key); // Remove to update order (for LRU)
+      this.cache.set(key, entry);
+      this.currentSize += entry.size;
+   }
+
+   async get(key: string): Promise<string | undefined> {
+      const entry = this.cache.get(key);
+      if (!entry) return;
+      if (this.isExpired(entry)) {
+         this.cache.delete(key);
+         this.currentSize -= entry.size;
+         return;
+      }
+      // mark as recently used
+      this.cache.delete(key);
+      this.cache.set(key, entry);
+      return entry.value;
+   }
+
+   async set(key: string, value: string, ttl?: number): Promise<void> {
+      const expiresAt =
+         ttl === undefined
+            ? this.defaultTTL > 0
+               ? this.now() + this.defaultTTL * 1000
+               : null
+            : ttl > 0
+              ? this.now() + ttl * 1000
+              : null;
+      const size = byteLength(key) + byteLength(value);
+      this.setEntry(key, { value, expiresAt, size });
+   }
+
+   async del(key: string): Promise<void> {
+      const entry = this.cache.get(key);
+      if (entry) {
+         this.currentSize -= entry.size;
+         this.cache.delete(key);
+      }
+   }
+}
+
+export const cacheMemory = (options?: InMemoryCacheOptions) => {
+   return new InMemoryCacheDriver(options);
+};

app/src/core/drivers/cache/index.ts

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+/**
+ * Interface for cache driver implementations
+ * Defines standard methods for interacting with a cache storage system
+ */
+export interface ICacheDriver {
+   /**
+    * Retrieves a value from the cache by its key
+    *
+    * @param key unique identifier for the cached value
+    * @returns resolves to the cached string value or undefined if not found
+    */
+   get(key: string): Promise<string | undefined>;
+
+   /**
+    * Stores a value in the cache with an optional time-to-live
+    *
+    * @param key unique identifier for storing the value
+    * @param value string value to cache
+    * @param ttl optional time-to-live in seconds before the value expires
+    * @throws if the value cannot be stored
+    */
+   set(key: string, value: string, ttl?: number): Promise<void>;
+
+   /**
+    * Removes a value from the cache
+    *
+    * @param key unique identifier of the value to delete
+    */
+   del(key: string): Promise<void>;
+}
+
+export { cacheDriverTestSuite } from "./cache-driver-test-suite";

app/src/core/drivers/email/index.ts

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+export type TEmailResponse<Data = unknown> = {
+   success: boolean;
+   data?: Data;
+};
+
+export interface IEmailDriver<Data = unknown, Options = object> {
+   send(
+      to: string,
+      subject: string,
+      body: string | { text: string; html: string },
+      options?: Options,
+   ): Promise<TEmailResponse<Data>>;
+}

app/src/core/drivers/email/mailchannels.ts

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+import { mergeObject, type RecursivePartial } from "core/utils";
+import type { IEmailDriver } from "./index";
+
+export type MailchannelsEmailOptions = {
+   apiKey: string;
+   host?: string;
+   from?: { email: string; name: string };
+};
+
+export type Recipient = {
+   email: string;
+   name?: string;
+};
+
+export type MailchannelsSendOptions = RecursivePartial<{
+   attachments: Array<{
+      content: string;
+      filename: string;
+      type: string;
+   }>;
+   campaign_id: string;
+   content: Array<{
+      template_type?: string;
+      type: string;
+      value: string;
+   }>;
+   dkim_domain: string;
+   dkim_private_key: string;
+   dkim_selector: string;
+   from: Recipient;
+   headers: {};
+   personalizations: Array<{
+      bcc: Array<Recipient>;
+      cc: Array<Recipient>;
+      dkim_domain: string;
+      dkim_private_key: string;
+      dkim_selector: string;
+      dynamic_template_data: {};
+      from: Recipient;
+      headers: {};
+      reply_to: Recipient;
+      subject: string;
+      to: Array<Recipient>;
+   }>;
+   reply_to: Recipient;
+   subject: string;
+   tracking_settings: {
+      click_tracking: {
+         enable: boolean;
+      };
+      open_tracking: {
+         enable: boolean;
+      };
+   };
+   transactional: boolean;
+}>;
+
+export type MailchannelsEmailResponse = {
+   request_id: string;
+   results: Array<{
+      index: number;
+      message_id: string;
+      reason: string;
+      status: string;
+   }>;
+};
+
+export const mailchannelsEmail = (
+   config: MailchannelsEmailOptions,
+): IEmailDriver<MailchannelsEmailResponse, MailchannelsSendOptions> => {
+   const host = config.host ?? "https://api.mailchannels.net/tx/v1/send";
+   const from = config.from ?? { email: "onboarding@mailchannels.net", name: "Mailchannels" };
+   return {
+      send: async (
+         to: string,
+         subject: string,
+         body: string | { text: string; html: string },
+         options?: MailchannelsSendOptions,
+      ) => {
+         const payload: MailchannelsSendOptions = mergeObject(
+            {
+               from,
+               subject,
+               content:
+                  typeof body === "string"
+                     ? [{ type: "text/html", value: body }]
+                     : [
+                          { type: "text/plain", value: body.text },
+                          { type: "text/html", value: body.html },
+                       ],
+               personalizations: [
+                  {
+                     to: [{ email: to }],
+                  },
+               ],
+            },
+            options,
+         );
+
+         const res = await fetch(host, {
+            method: "POST",
+            headers: {
+               "Content-Type": "application/json",
+               "X-Api-Key": config.apiKey,
+            },
+            body: JSON.stringify({ ...payload, ...options }),
+         });
+
+         if (res.ok) {
+            const data = (await res.json()) as MailchannelsEmailResponse;
+            return { success: true, data };
+         }
+         return { success: false };
+      },
+   };
+};

app/src/core/drivers/email/resend.ts

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+import type { IEmailDriver } from "./index";
+
+export type ResendEmailOptions = {
+   apiKey: string;
+   host?: string;
+   from?: string;
+};
+
+export type ResendEmailSendOptions = {
+   bcc?: string | string[];
+   cc?: string | string[];
+   reply_to?: string | string[];
+   scheduled_at?: string;
+   headers?: Record<string, string>;
+   attachments?: {
+      content: Buffer | string;
+      filename: string;
+      path: string;
+      content_type: string;
+   }[];
+   tags?: {
+      name: string;
+      value: string;
+   }[];
+};
+
+export type ResendEmailResponse = {
+   id: string;
+};
+
+export const resendEmail = (
+   config: ResendEmailOptions,
+): IEmailDriver<ResendEmailResponse, ResendEmailSendOptions> => {
+   const host = config.host ?? "https://api.resend.com/emails";
+   const from = config.from ?? "Acme <onboarding@resend.dev>";
+   return {
+      send: async (
+         to: string,
+         subject: string,
+         body: string | { text: string; html: string },
+         options?: ResendEmailSendOptions,
+      ) => {
+         const payload: any = {
+            from,
+            to,
+            subject,
+         };
+
+         if (typeof body === "string") {
+            payload.html = body;
+         } else {
+            payload.html = body.html;
+            payload.text = body.text;
+         }
+
+         const res = await fetch(host, {
+            method: "POST",
+            headers: {
+               "Content-Type": "application/json",
+               Authorization: `Bearer ${config.apiKey}`,
+            },
+            body: JSON.stringify({ ...payload, ...options }),
+         });
+
+         if (res.ok) {
+            const data = (await res.json()) as ResendEmailResponse;
+            return { success: true, data };
+         }
+         return { success: false };
+      },
+   };
+};

app/src/core/drivers/email/ses.ts

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+import type { IEmailDriver } from "./index";
+import { AwsClient } from "aws4fetch";
+
+export type SesEmailOptions = {
+   region: string;
+   accessKeyId: string;
+   secretAccessKey: string;
+   from: string;
+};
+
+export type SesSendOptions = {
+   cc?: string[];
+   bcc?: string[];
+   replyTo?: string[];
+};
+
+export type SesEmailResponse = {
+   MessageId?: string;
+   status: number;
+   body: string;
+};
+
+export const sesEmail = (
+   config: SesEmailOptions,
+): IEmailDriver<SesEmailResponse, SesSendOptions> => {
+   const endpoint = `https://email.${config.region}.amazonaws.com/`;
+   const from = config.from;
+   const aws = new AwsClient({
+      accessKeyId: config.accessKeyId,
+      secretAccessKey: config.secretAccessKey,
+      service: "ses",
+      region: config.region,
+   });
+   return {
+      send: async (
+         to: string,
+         subject: string,
+         body: string | { text: string; html: string },
+         options?: SesSendOptions,
+      ) => {
+         // build SES SendEmail params (x-www-form-urlencoded)
+         const params: Record<string, string> = {
+            Action: "SendEmail",
+            Version: "2010-12-01",
+            Source: from,
+            "Destination.ToAddresses.member.1": to,
+            "Message.Subject.Data": subject,
+         };
+         if (typeof body === "string") {
+            params["Message.Body.Html.Data"] = body;
+         } else {
+            params["Message.Body.Html.Data"] = body.html;
+            params["Message.Body.Text.Data"] = body.text;
+         }
+         if (options?.cc) {
+            options.cc.forEach((cc, i) => {
+               params[`Destination.CcAddresses.member.${i + 1}`] = cc;
+            });
+         }
+         if (options?.bcc) {
+            options.bcc.forEach((bcc, i) => {
+               params[`Destination.BccAddresses.member.${i + 1}`] = bcc;
+            });
+         }
+         if (options?.replyTo) {
+            options.replyTo.forEach((reply, i) => {
+               params[`ReplyToAddresses.member.${i + 1}`] = reply;
+            });
+         }
+         const formBody = Object.entries(params)
+            .map(([k, v]) => encodeURIComponent(k) + "=" + encodeURIComponent(v))
+            .join("&");
+         const res = await aws.fetch(endpoint, {
+            method: "POST",
+            headers: { "content-type": "application/x-www-form-urlencoded" },
+            body: formBody,
+         });
+         const text = await res.text();
+         // try to extract MessageId from XML response
+         let MessageId: string | undefined = undefined;
+         const match = text.match(/<MessageId>([^<]+)<\/MessageId>/);
+         if (match) MessageId = match[1];
+         return {
+            success: res.ok,
+            data: { MessageId, status: res.status, body: text },
+         };
+      },
+   };
+};

app/src/core/drivers/index.ts

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+export type { ICacheDriver } from "./cache";
+export { cacheMemory } from "./cache/in-memory";
+
+export type { IEmailDriver } from "./email";
+export { resendEmail } from "./email/resend";