Example service middleware

hooks.js

class MessageService {
  // Find a list of resources
  find(params) {},
  // Get a single resource by its id
  get(id, params) {},
  // Create a new resource
  create(data, params) {},
  // Replace an existing resource by its id with data
  update(id, data, params) {},
  // Merge new data into a resource
  patch(id, data, params) {},
  // Remove a resource by its id
  remove(id, params) {}
}

const messages = new MessageService();

// Log the runtime for all method calls
messages.use(async (ctx, next) => {
  // Store the start time
  const start = Date.now();

  // Pass to the next middleware and wait for everything to return
  await next();

  // Calculate the total runtime everything took
  const ms = Date.now() - start;

  // Log runtime with method name
  console.log(`Calling ${ctx.method} took ${ms}ms`);
});

messages.use({
  // For `create`, add the current date as `createdAt` before saving everything to the database
  create: [async (ctx, next) => {
    ctx.data.createdAt = new Date();
    
    // Go on to the next step (actual service `create` in this case)
    await next();
  }]
});