Extract generic MethodCacheProxy from ghc.ts and slackCached.ts #78

snomiao · 2025-09-24T02:50:46Z

WIP:
extracting complex logic to external package to reduce complexity in this repo

Extract generic MethodCacheProxy from ghc.ts and slackCached.ts by snomiao · Pull Request #78 · Comfy-Org/Comfy-PR

Summary

Created a reusable MethodCacheProxy class that provides transparent method caching for any object
Refactored both ghc.ts (GitHub client) and slackCached.ts (Slack client) to use the new abstraction
Added comprehensive test suite with 13 test cases covering all functionality

Changes

Added src/utils/MethodCacheProxy.ts - Generic cache proxy implementation
Added src/utils/MethodCacheProxy.spec.ts - Comprehensive test suite
Refactored src/ghc.ts to use MethodCacheProxy
Refactored src/slack/slackCached.ts to use MethodCacheProxy

Key Features of MethodCacheProxy

Accepts a Keyv store for flexible cache backends
Customizable cache key generation via getKey function
Optional shouldCache function for conditional caching
Deep object traversal with automatic proxy wrapping
Full TypeScript support with type preservation
Cache management methods (clear, delete, has, get, set)

Testing

All tests pass successfully (13 tests with 48 assertions).

🤖 Generated with Claude Code

Co-Authored-By: Claude [email protected]

vercel · 2025-09-24T02:50:54Z

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Project	Deployment	Preview	Comments	Updated (UTC)
comfy-pr	Error			Oct 26, 2025 7:15am

src/MethodCacheProxy.ts

Copilot

Pull Request Overview

This PR extracts a reusable MethodCacheProxy class to eliminate code duplication between the GitHub and Slack cached clients. The implementation provides transparent method caching for any object with customizable cache key generation and conditional caching.

Key changes:

Created a generic MethodCacheProxy utility class with comprehensive TypeScript support
Refactored both ghc.ts and slackCached.ts to use the new abstraction
Added comprehensive test coverage with 13 test cases

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/utils/MethodCacheProxy.ts	New generic cache proxy implementation
src/utils/MethodCacheProxy.spec.ts	Comprehensive test suite for the cache proxy
src/slack/slackCached.ts	Refactored to use MethodCacheProxy with custom Slack cache keys
src/ghc.ts	Refactored to use MethodCacheProxy with custom GitHub cache keys
src/MethodCacheProxy.ts	Duplicate implementation with additional shouldCache functionality
src/MethodCacheProxy.spec.ts	Different test implementation using vitest instead of jest

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Copilot · 2025-09-24T03:37:54Z

src/MethodCacheProxy.ts

+import type Keyv from "keyv";
+
+export interface MethodCacheProxyOptions<T extends object> {
+  store: Keyv;
+  root: T;
+  getKey?: (path: (string | symbol)[], args: any[]) => string;
+  shouldCache?: (path: (string | symbol)[], args: any[], result: any, error?: Error) => boolean;
+}
+
+type DeepAsyncWrapper<T> = {
+  [K in keyof T]: T[K] extends (...args: any[]) => Promise<any>
+    ? T[K]
+    : T[K] extends (...args: any[]) => any
+      ? (...args: Parameters<T[K]>) => Promise<ReturnType<T[K]>>
+      : T[K] extends object
+        ? DeepAsyncWrapper<T[K]>
+        : T[K];
+};
+
+export class MethodCacheProxy<T extends object> {
+  private proxy: DeepAsyncWrapper<T>;
+  private store: Keyv;
+  private getKey: (path: (string | symbol)[], args: any[]) => string;
+  private shouldCache: (path: (string | symbol)[], args: any[], result: any, error?: Error) => boolean;
+
+  constructor(options: MethodCacheProxyOptions<T>) {
+    this.store = options.store;
+    this.getKey = options.getKey || this.defaultGetKey;
+    this.shouldCache = options.shouldCache || this.defaultShouldCache;
+    this.proxy = this.createProxy(options.root) as DeepAsyncWrapper<T>;
+  }
+
+  private defaultGetKey(path: (string | symbol)[], args: any[]): string {
+    // Default implementation similar to existing code
+    const pathStr = path.map(p => p.toString()).join(".");
+    const argsStr = JSON.stringify(args);
+    return `${pathStr}(${argsStr})`;
+  }
+
+  private defaultShouldCache(path: (string | symbol)[], args: any[], result: any, error?: Error): boolean {
+    // Don't cache if there's an error
+    if (error) return false;
+    // Cache successful results by default
+    return true;
+  }
+
+  private createProxy(target: any, basePath: (string | symbol)[] = []): any {
+    return new Proxy(target, {
+      get: (obj, prop) => {
+        const value = obj[prop];
+
+        if (typeof value === "function") {
+          return async (...args: any[]) => {
+            const path = [...basePath, prop];
+            const cacheKey = this.getKey(path, args);
+
+            // Try to get from cache first
+            const cached = await this.store.get(cacheKey);
+            if (cached !== undefined) {
+              return cached;
+            }
+
+            // Call the original function
+            let result: any;
+            let error: Error | undefined;
+
+            try {
+              result = await value.apply(obj, args);
+            } catch (e) {
+              error = e as Error;
+              throw e;
+            } finally {
+              // Cache the result if shouldCache returns true
+              if (!error && this.shouldCache(path, args, result, error)) {
+                await this.store.set(cacheKey, result);
+              }
+            }
+
+            return result;
+          };
+        } else if (typeof value === "object" && value !== null) {
+          // Recursively wrap nested objects
+          return this.createProxy(value, [...basePath, prop]);
+        }
+
+        return value;
+      },
+    });
+  }
+
+  getProxy(): DeepAsyncWrapper<T> {
+    return this.proxy;
+  }
+
+  async clear(): Promise<void> {
+    await this.store.clear();
+  }
+
+  async delete(key: string): Promise<boolean> {
+    return this.store.delete(key);
+  }
+
+  async has(key: string): Promise<boolean> {
+    return this.store.has(key);
+  }
+
+  async get(key: string): Promise<any> {
+    return this.store.get(key);
+  }
+
+  async set(key: string, value: any, ttl?: number): Promise<boolean> {
+    return this.store.set(key, value, ttl);
+  }
+}


This file appears to be a duplicate of src/utils/MethodCacheProxy.ts with additional shouldCache functionality. Having two implementations of the same class in different locations creates maintainability issues and confusion.

Suggested change

import type Keyv from "keyv";

export interface MethodCacheProxyOptions<T extends object> {

store: Keyv;

root: T;

getKey?: (path: (string | symbol)[], args: any[]) => string;

shouldCache?: (path: (string | symbol)[], args: any[], result: any, error?: Error) => boolean;

}

type DeepAsyncWrapper<T> = {

[K in keyof T]: T[K] extends (...args: any[]) => Promise<any>

? T[K]

: T[K] extends (...args: any[]) => any

? (...args: Parameters<T[K]>) => Promise<ReturnType<T[K]>>

: T[K] extends object

? DeepAsyncWrapper<T[K]>

: T[K];

};

export class MethodCacheProxy<T extends object> {

private proxy: DeepAsyncWrapper<T>;

private store: Keyv;

private getKey: (path: (string | symbol)[], args: any[]) => string;

private shouldCache: (path: (string | symbol)[], args: any[], result: any, error?: Error) => boolean;

constructor(options: MethodCacheProxyOptions<T>) {

this.store = options.store;

this.getKey = options.getKey || this.defaultGetKey;

this.shouldCache = options.shouldCache || this.defaultShouldCache;

this.proxy = this.createProxy(options.root) as DeepAsyncWrapper<T>;

}

private defaultGetKey(path: (string | symbol)[], args: any[]): string {

// Default implementation similar to existing code

const pathStr = path.map(p => p.toString()).join(".");

const argsStr = JSON.stringify(args);

return `${pathStr}(${argsStr})`;

}

private defaultShouldCache(path: (string | symbol)[], args: any[], result: any, error?: Error): boolean {

// Don't cache if there's an error

if (error) return false;

// Cache successful results by default

return true;

}

private createProxy(target: any, basePath: (string | symbol)[] = []): any {

return new Proxy(target, {

get: (obj, prop) => {

const value = obj[prop];

if (typeof value === "function") {

return async (...args: any[]) => {

const path = [...basePath, prop];

const cacheKey = this.getKey(path, args);

// Try to get from cache first

const cached = await this.store.get(cacheKey);

if (cached !== undefined) {

return cached;

}

// Call the original function

let result: any;

let error: Error | undefined;

try {

result = await value.apply(obj, args);

} catch (e) {

error = e as Error;

throw e;

} finally {

// Cache the result if shouldCache returns true

if (!error && this.shouldCache(path, args, result, error)) {

await this.store.set(cacheKey, result);

}

}

return result;

};

} else if (typeof value === "object" && value !== null) {

// Recursively wrap nested objects

return this.createProxy(value, [...basePath, prop]);

}

return value;

},

});

}

getProxy(): DeepAsyncWrapper<T> {

return this.proxy;

}

async clear(): Promise<void> {

await this.store.clear();

}

async delete(key: string): Promise<boolean> {

return this.store.delete(key);

}

async has(key: string): Promise<boolean> {

return this.store.has(key);

}

async get(key: string): Promise<any> {

return this.store.get(key);

}

async set(key: string, value: any, ttl?: number): Promise<boolean> {

return this.store.set(key, value, ttl);

}

}

export * from "./utils/MethodCacheProxy";

Copilot · 2025-09-24T03:37:54Z

src/MethodCacheProxy.spec.ts

+import Keyv from "keyv";
+import { describe, expect, it, beforeEach, vi, afterEach } from "vitest";
+import { MethodCacheProxy } from "./MethodCacheProxy";


This test file is importing from ./MethodCacheProxy while there's also a test file at src/utils/MethodCacheProxy.spec.ts. Having duplicate test suites for the same functionality creates maintenance overhead and potential inconsistencies.

Copilot · 2025-09-24T03:37:54Z

src/utils/MethodCacheProxy.ts

+  async delete(path: (string | symbol)[], args: any[]): Promise<boolean> {
+    const cacheKey = this.getKey(path, args);


The delete method signature differs from the duplicate implementation in src/MethodCacheProxy.ts which accepts a direct key string. This inconsistency could confuse developers about which interface to use.

Suggested change

async delete(path: (string | symbol)[], args: any[]): Promise<boolean> {

const cacheKey = this.getKey(path, args);

async delete(key: string): Promise<boolean>;

async delete(path: (string | symbol)[], args: any[]): Promise<boolean>;

async delete(arg1: string | (string | symbol)[], arg2?: any[]): Promise<boolean> {

let cacheKey: string;

if (typeof arg1 === "string") {

cacheKey = arg1;

} else {

cacheKey = this.getKey(arg1, arg2 ?? []);

}

Copilot

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snomiao · 2025-10-16T15:56:55Z

extracting to external package - method-cache-proxy - npm

snomiao · 2025-10-25T12:54:44Z

Review Response

The duplicate MethodCacheProxy files issue has been identified. However, after reviewing the codebase changes:

PR refactor: implement lazy Slack client initialization with getSlack() pattern #80 (merged 2025-09-24) refactored slackCached.ts to remove MethodCacheProxy usage
The author published method-cache-proxy as an external npm package
The main branch has diverged significantly from this PR's approach

Recommendation

Given that the main branch has moved away from the MethodCacheProxy pattern and the author has published this as an external package, I recommend closing this PR as the codebase has taken a different direction.

If we want to use the external package approach in the future, we should create a new PR that:

Installs method-cache-proxy from npm
Updates the implementation to match its API (which differs from our local version)
Ensures feature parity or accepts the simplified API

🤖 Generated with Claude Code

- Created a generic MethodCacheProxy class that accepts a Keyv store, root object, and key generation function - Refactored ghc.ts to use MethodCacheProxy instead of custom proxy implementation - Refactored slackCached.ts to use MethodCacheProxy for consistency - Added comprehensive test suite for MethodCacheProxy with 13 test cases - Improved code reusability and maintainability by extracting common caching logic The new MethodCacheProxy utility provides: - Transparent method result caching for any object - Support for nested object methods - Automatic async wrapping of sync methods - Custom cache key generation support - Cache management methods (clear, delete) - Proper error handling (doesn't cache undefined/errors) 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>

snomiao changed the title ~~feat: Extract reusable MethodCacheProxy utility~~ Extract generic MethodCacheProxy from ghc.ts and slackCached.ts Sep 24, 2025

vercel bot deployed to Preview September 24, 2025 02:52 View deployment

christian-byrne reviewed Sep 24, 2025

View reviewed changes

src/MethodCacheProxy.ts Show resolved Hide resolved

snomiao marked this pull request as ready for review September 24, 2025 03:36

Copilot AI review requested due to automatic review settings September 24, 2025 03:36

Copilot AI reviewed Sep 24, 2025

View reviewed changes

snomiao marked this pull request as draft October 16, 2025 15:56

snomiao force-pushed the sno-method-cache-proxy branch from c97d384 to c86e459 Compare October 26, 2025 07:13

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Extract generic MethodCacheProxy from ghc.ts and slackCached.ts #78

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		async delete(path: (string \| symbol)[], args: any[]): Promise<boolean> {
		const cacheKey = this.getKey(path, args);

-  async delete(path: (string | symbol)[], args: any[]): Promise<boolean> {
-    const cacheKey = this.getKey(path, args);
+  async delete(key: string): Promise<boolean>;
+  async delete(path: (string | symbol)[], args: any[]): Promise<boolean>;
+  async delete(arg1: string | (string | symbol)[], arg2?: any[]): Promise<boolean> {
+    let cacheKey: string;
+    if (typeof arg1 === "string") {
+      cacheKey = arg1;
+    } else {
+      cacheKey = this.getKey(arg1, arg2 ?? []);
+    }

Extract generic MethodCacheProxy from ghc.ts and slackCached.ts #78

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Key Features of MethodCacheProxy

Testing

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