Meteor

see also https://gist.github.com/hamxiaoz

Guide

Kadira Academy

• _ routing guide: flow router (don't do data management and auth on route level)

• x Meteor Performance 101

• _ bulletproof

Little Projects

• https://themeteorchef.com/snippets/importing-csvs/

Tools:

• admin for mongo db: http://www.drmongo.com/

How to do logging via winston and loggly

Inspired from this guide: https://meteorhacks.com/logging-support-for-meteor 1. Sign up loggly 2. add 'winston' and 'winston-loggly' to package.json 3. code Don't forget Meteor.npmRequire is only available on server side 4. LOGGER.info will output on console and send events to loggly

# Setup logging in server/config.js
@LOGGER = Meteor.npmRequire 'winston'
Meteor.npmRequire 'winston-loggly'
LOGGER.add(LOGGER.transports.Loggly, {
  token: "YOUR-TOKEN",
  subdomain: "YOUR-DOMAIN",
  tags: ["YOUR-TAG"],
  json:true,
  handleExceptions: true, # handle exception in logger
  humanReadableUnhandledException: true
});
LOGGER.existOnError = false # don't exit on error
LOGGER.info 'logger started'

How to send email using SendGrid

Or see my Medium post

• regiter sendgrid
• create different user with (Mail capability): https://app.sendgrid.com/settings/credentials
• meter add email

• Then you can use the mail package to send email: https://gist.github.com/aaronthorp/8410571
• Reference: https://themeteorchef.com/snippets/using-the-email-package/
• Why not Mandrill?
• Why SendGrid?

DDP

DDP Spec

meteor-ddp-analyzer

Performance

DB

• When setup db, enable db oplog

  • If your query has a limit but not a sort specifier, your query can't take advantage of oplog

    Posts.find({category: "meteor"}, {limit: 10});

• _ add index

Counting on the server side

• _ Mongodb aggregation
• _ https://kadira.io/academy/meteor-performance-101/content/reducing-pubsub-data-usage#counting-on-the-server-side

Publication

• limit fields (cannot do both inclusion/exclusion) on publication:

  Users.find({}, {fields: {password: 0, hash: 0}})

• Infinite Scrolling using limit
• Pagination, problem demo on MeteorPad

Subscription

• Use subscription manager to avoid re-sub when route changes

_ Observer

• https://kadira.io/academy/meteor-performance-101/content/improve-cpu-and-network-usage
• https://kadira.io/academy/meteor-performance-101/content/know-your-observers

Reduce wait time: this.unblock()

• this.unblock will allow the next available DDP message to process without waiting for the current method.

• Use it when your methods and subscriptions (enabled via this package: meteor add meteorhacks:unblock) don't depend on others

• Do not use it when a method will cause side effects and subsequent methods will depend on those side effects.

  For example you have a method to update name and another method to send notification emails about the updated name, if unblock is used, the email might contain the old name.

• This is all on a per client basis: there no blocking involved globally.

Try CPU profiling analysis

Client Side

Store data in template instance using ReactiveVar

You can store ReactiveVar in the template instance. A ReactiveVar is similar to a Session variable, with a few differences:

• ReactiveVars don't have global names, like the "foo" in Session.get("foo"). Instead, they may be created and used locally, for example attached to a template instance, as in: this.foo.get(). // 'this' is the template instance

• ReactiveVars are not automatically migrated across hot code pushes, whereas Session state is.

• ReactiveVars can hold any value, while Session variables are limited to JSON or EJSON.

if (Meteor.isClient) {  
  Template.hello.created = function () {
    // counter starts at 0
    this.counter = new ReactiveVar(0);
  };

  Template.hello.helpers({
    counter: function () {
      return Template.instance().counter.get();
    }
  });

  Template.hello.events({
    'click button': function (event, template) {
      // increment the counter when button is clicked
      template.counter.set(template.counter.get() + 1);
    }
  });
}

Packages

fs

• collection-fs

  • tips: http://blog.zipboard.co/2015/11/23/cfs-tips-and-tricks-for-meteorjs/
• slingshot: https://atmospherejs.com/edgee/slingshot

  • go directly to S3

  • Set ACL to 'private' so only your meteor app can download the file

  • Use S3 sdk to generate pre-signed url for public download

    • https://github.com/peerlibrary/meteor-aws-sdk
    • http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/node-services.html
    • http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#getSignedUrl-property
• Upload and download in server https://github.com/VeliovGroup/Meteor-Files/
• Upload to any path in server: https://github.com/tomitrescak/meteor-uploads