Store all bot messages

How would I store all the context.event.message.text for every request from all users without programming it into each handler?

My storing these it will be a great tool to see which commands are popular and most mis-typed. Also a great way to see indirectly the new commands people are looking for.

[chentsulin]

Bottender has three different approaches to get this done, but we haven’t figured out which one is better yet.

1. Use server middleware. You can save JSON-parsed request body here, for example:

Express:

const { createServer } = require('bottender/express');

const bot = require('./bot');

const middleware = (req, res, next) => {
  // do something here to save req.body
  next();
};

const server = createServer(bot, {
  webhookMiddleware: middleware,
});

Koa:

const { createServer } = require('bottender/koa');

const bot = require('./bot');

const middleware = (ctx, next) => {
  // do something here to save ctx.request.body
  return next();
};

const server = createServer(bot, {
  webhookMiddleware: middleware,
});

1. Put it on the top of your root handler

bot.onEvent(async context => {
  if (context.event.isText) {
    // do something here to save context.event.text
  }
  
  // other....
});

1. Use plugin (this a hidden feature we are currently working on)

bot.use(async context => {
  if (context.event.isText) {
    // do something here to save context.event.text
  }
});

bot.onEvent(...);

[chentsulin]

The approaches have been elaborated in https://github.com/Yoctol/bottender/issues/168#issuecomment-358838078