prisma-redis-middleware

This is a Prisma middleware used for caching and storing of Prisma queries in Redis (uses an in-memory LRU cache as fallback storage).

Uses async-cache-dedupe.

Features

• Cache Invalidation
• Supports custom cache keys
• Cache persistance with Redis (uses an in-memory LRU cache as fallback)
• Caching multiple Prisma models each with a specific cache time
• Excluding certain Prisma models from being cached
• Excluding certain Prisma queries from being cached across all models

Supported Node.js versions

The latest versions of the following Node.js versions are tested and supported.

• 16
• 18

Default Cached Methods

Here is a list of all the Prisma methods that are currently cached by default in prisma-redis-middleware.

• findUnique
• findUniqueOrThrow
• findFirst
• findFirstOrThrow
• findMany
• count
• aggregate
• groupBy
• findRaw
• aggregateRaw

queryRaw is not cached as it's executed against the Prisma db itself and not a model. This Prisma middleware is used for caching queries based on the models that they are executed against.

Quick Start

Install the package using npm:

npm i --save-exact prisma-redis-middleware

You will also need to install and configure an external dependency for Redis (for example: ioredis or one that uses a similar API) if you don't already have a Redis Client in your project.

npm i --save-exact ioredis @types/ioredis

Code Example (ESM / Import)

import Prisma from "prisma";
import { PrismaClient } from "@prisma/client";
import { createPrismaRedisCache } from "prisma-redis-middleware";
import Redis from "ioredis";

const redis = new Redis(); // Uses default options for Redis connection

const prisma = new PrismaClient();

const cacheMiddleware: Prisma.Middleware = createPrismaRedisCache({
  models: [
    { model: "User", excludeMethods: ["findMany"] },
    { model: "Post", cacheTime: 180, cacheKey: "article" },
  ],
  storage: { type: "redis", options: { client: redis, invalidation: { referencesTTL: 300 }, log: console } },
  cacheTime: 300,
  excludeModels: ["Product", "Cart"],
  excludeMethods: ["count", "groupBy"],
  onHit: (key) => {
    console.log("hit", key);
  },
  onMiss: (key) => {
    console.log("miss", key);
  },
  onError: (key) => {
    console.log("error", key);
  },
});

prisma.$use(cacheMiddleware);

Code Example (Common JS / Require)

const Prisma = require("prisma");
const { PrismaClient } = require("@prisma/client");
const { createPrismaRedisCache } = require("prisma-redis-middleware");

const prisma = new PrismaClient();

const cacheMiddleware: Prisma.Middleware = createPrismaRedisCache({
  models: [
    { model: "User", cacheTime: 60 },
    { model: "Post", cacheTime: 180 },
  ],
  storage: { type: "memory", options: { invalidation: true, log: console } },
  cacheTime: 300,
  onHit: (key) => {
    console.log("hit", key);
  },
  onMiss: (key) => {
    console.log("miss", key);
  },
  onError: (key) => {
    console.log("error", key);
  },
});

prisma.$use(cacheMiddleware);

API

createPrismaRedisCache(opts)

Options:

• onDedupe: (optional) a function that is called every time a query is deduped.

• onError: (optional) a function that is called every time there is a cache error.

• onHit: (optional) a function that is called every time there is a hit in the cache.

• onMiss: (optional) a function that is called every time the result is not in the cache.

• cacheTime: (optional) (number) the default time (in seconds) to use for models that don't have a cacheTime value set. Default is 0.

• excludeModels: (optional) (string) an array of models to exclude from being cached.

• excludeMethods: (optional) (string) an array of Prisma methods to exclude from being cached for all models.

• models: (optional) an array of Prisma models. Models options are:

  • model: (required) string.

  • cacheKey: (optional) string. Default is the model value.

  • cacheTime: (optional) number (in seconds).

  • excludeMethods: (optional) (string) an array of Prisma methods to exclude from being cached for this model.

  • invalidateRelated: (optional) (string) an array of Prisma models to invalidate when mutating this model.

    Example:

    createPrismaRedisCache({
      models: [
        { model: "User", cacheTime: 60, invalidateRelated: ["Post"] },
        { model: "Post", cacheKey: "article", excludeMethods: ["findFirst"] },
      ],
    });

• storage: (optional) the storage options; default is { type: "memory" }. Storage options are:

  • type: memory (default) or redis

  • options: by storage type

    • for memory type

      • size: (optional) maximum number of items to store in the cache. Default is 1024.
      • invalidation: (optional) enable invalidation. Default is disabled.
      • log: (optional) logger instance pino compatible, or console, default is disabled.

      Example:

      createPrismaRedisCache({
        storage: { type: "memory", options: { size: 2048 }, log: console },
      });

    • for redis type

      • client: a redis client instance, mandatory. Should be an ioredis client or compatible.
      • invalidation: (optional) enable invalidation. Default is disabled.
      • invalidation.referencesTTL: (optional) references TTL in seconds, it means how long the references are alive; it should be set at the maximum of all the caches ttl.
      • log: (optional) logger instance pino compatible, or console, default is disabled.

      Example

      const redis = new Redis();
      
      createPrismaRedisCache({
        storage: {
          type: "redis",
          options: { client: redis, invalidation: { referencesTTL: 60 }, log: console },
        },
      });

• transformer: (optional) the transformer to used to serialize and deserialize the cache entries. It must be an object with the following methods:

  • serialize: a function that receives the result of the original function and returns a serializable object.

  • deserialize: a function that receives the serialized object and returns the original result.

  • Default is undefined, so the default transformer is used.

    Example

    import superjson from "superjson";
    
    createPrismaRedisCache({
      transformer: {
        serialize: (result) => superjson.serialize(result),
        deserialize: (serialized) => superjson.deserialize(serialized),
      },
    });

Debugging

You can pass functions for onMiss, onHit, onError and onDedupe to createPrismaRedisCache which can then be used to debug whether a Prisma query is being cached or not.

You can also pass a custom log (pino or console) to the storage option and async-cache-dedupe will print debug info as it queries, sets, expires and invalidates the cache. Note that the log option can print out very verbose output.