HeyYou

Send multichannel notifications with one command. Сonvenient storage of notifications texts. Create your own channels. Registrate receiver and send notifications for him easy.

• Requirements
• Installation
• How to use
  • Configure
  • Registrate receiver
  • Build your notification
  • Send notification
  • Sender options
  • Create your own channels
• Extensions

• Ruby 2.5.0 min (rspec works with ruby 2.5.0, 2.6.0, 2.7.0)
• FCM - Gem send push notification using fcm gem. You need fcm server key to successful configure push notifications.

gem 'hey-you'

And then execute:

$ bundle

Or install it yourself as:

$ gem install hey-you    

First, you must configure HeyYou. Example:

  HeyYou::Config.configure do
    config.data_source.options = { collection_files: ['config/notifications.yml'] }
    config.email.from = 'noreply@example-mail.com'
    config.push.fcm_token = 'fcm_server_key'
  end

Options for gem base work.

• config.data_source.source_class - Class implemented instance method load_collections returning hash (by default HeyYou::DataSource::Yaml)
• config.data_source.options - Arguments for source_class. This options will be passed to init source_class OR
• config.data_source.source_instance - Instance of source class implemented load_collections

Read more about data source in data source.d

• config.push.fcm_token - Required setting for push channel. You can not send push messages if setting was not set. You should set it to equal your fcm server key.

• config.email.from - Email address for send email notifications.

Additional options for configure your notifications.

• config.splitter - Chars for split notification keys for builder. Default: .
• config.registered_channels - Avialable channels for your applications. Default: [:push, :email]
• config.require_all_channels - Boolean. If true, when data for channel will not found in file collection, error will be raised. Default: false
• config.localization - Boolean. If true, hey-you begin support I18n locales for notifications collection. Your notifications for build should be nested in I18n.locale key. Default: false. For example:

# config/initializers/hey-you.rb
HeyYou::Config.configure do
  ...
  i18n_files = Rails.application.config.i18n.available_locales.map do |locale|
    "config/notifications/#{locale}.yml" 
  end 
  config.data_source.options = { collection_files: i18n_files }
  ...
end 

# config/notifications/en.yml
en:
  any_key:
    any_nested_key:
      push:
        title: Test hey you
        body: Hey you, %{name}
      email:
        subject: Test hello
        body: Hey you, %{name}  

# config/notifications/ru.yml
ru:
  any_key:
    any_nested_key:
      push:
        title: Эй, ты!
        body: Эй, ты, %{name}
      email:
        subject: Привет
        body: Эй, ты, %{name}  

# From your code:
I18n.locale = :ru
user.send_notification('any_key.any_nested_key', name: 'QNester') #=> send notification with body `Эй, ты, QNester`
I18n.locale = :en
user.send_notification('any_key.any_nested_key', name: 'QNester') #=> send notification with body `Hey you, QNester`
user.send_notification('any_key.any_nested_key', name: 'QNester', locale: :ru) #=> send notification with body `Эй, ты, QNester`

• config.push.priority - priority level for your pushes. Default: high
• config.push.ttl - default time_to_live option for fcm. Default 60
• config.push.fcm_timeout - default timeout for fcm. Default 30

• config.email.layout - default layout for email letters.
• config.email.use_default_mailing - use default mail sending or use custom mailer classes
• config.email.default_mailer_class - default mailer class for email notifications
• config.email.default_mailer_method - default mailer_method for mailer_class
• config.email.default_delivery_method - expects, that mailer_method will build message and delivery_method will send it. If you use ActionMailer you can set this option like delivery_now or delivery_later.

By default all letters will send as simple text.

You can registrate your application classes like receivers. You can easy send notification for receiver with method #send_notification. For example:

class User < Model
  extend HeyYou::Receiver
  
  receive(
    push: -> { push_token.value }, 
    email: -> { email }
  )
end

Class method #receive will registrate your class User as receiver. In arguments we must pass Hash instance where keys - channels names as symbols, and values - procs for fetching values required to send notification. For push channel expected that proc will return receiver's fcm registration id. For email expected that proc will return receiver's email address.

You can pass options and sending condition for receiver channels. You must pass proc with receive_data to :subject key and options pass to :options key. if key should be passed for sending condition:

class User < Model
  extend HeyYou::Receiver
  
  receive(
    push: -> { push_token.value }, 
    email: { 
      subject: -> { email }, 
      if: -> { email_notifications? },
      options: { mailer_class: UserMailer, mailer_method: :notify! } 
    }
  )
end

If you pass correct procs in #receive you can send notification for your user like:

user = User.find(1)
user.send_notification('for_users.hello')

Last command will fetch notifications credentials for user instance and will try to send SMS, Push and Email for it. What argument we pass for method? This is string key for builder. Read next to understand it.

Sometimes you need send notification independent on user's notification settings. For this case you can use force option in #send_notification:

user = User.find(1)
user.settings.update!(email_notifications: false)
user.send_notification('for_users.hello') #=> will not send notification
user.send_notification('for_users.hello', force: true) #=> will send notification

HeyYou Notification Builder - good system for store your notifications in one place. By default you need create yml file with follow format:

# config/notifications/collection.yml
any_key:
  any_nested_key:
    push:
      title: Test hey you
      body: Hey you, %{name}
    email:
      subject: Test hello
      body: Hey you, %{name}  

You should pass file path to config.collection_file to load your notification texts. Now you can send notification:

...
user.send_notification('any_key.any_nested_key', name: 'HeyYou')

This command with fetch notifications templates from your collection file for each channel and will try interpolate it. If you will not pass required interpolation keys then error will be raised. After successful interpolation notification will send for all available channels for receiver:

1. Send push via fcm
2. Send email

Often we need store our notification text in another data source, not int yml files. HeyYou has flexible system for data source. All what you need - make your own provider source and pass it to config. For example:

class NotificationText < ApplicationRecord
  def self.load_collections
    # load colelctions from database to hash
    # THIS METHOD MUST returns hash! 
  end
end

HeyYou::Config.configure do
  # NotificationText is a rails model
  config.data_source.source_instance = NotificationText
end

HeyYou will pull texts from database to memory with initialize your application after this configuration. Builder will build your texts successfully.

HeyYou by default contains only two data sources:

1. HeyYou::DataSource::Yaml - for store notifications collections in data. For example:

  HeyYou::Config.configure do
    config.data_source.source_class = HeyYou::DataSource::Yaml
    config.data_source.options = { collection_files: ['config/notifications.yml'] }
  end

2. HeyYou::DataSource::Hash - store notification everywhere you want and pass to HeyYou only hash

  config.data_source.source_class = HeyYou::DataSource::Yaml
  config.data_source.options = { data: { welcome: { email: { ... }, push: { ... } } } }

Pay attention: for difference source we should pass difference options.

Receiver not only one way to send notification. You can send it using HeyYou::Sender. Just use method #send for HeyYou::Sender and pass notification key and to options like:

HeyYou::Sender.send!(
  'any_key.any_nested_key', 
  to: {
    push: 'fcm_registration_token', 
    email: 'example_mail@example.com'  
  },
  name: 'HeyYou'
)

This command will process texts and send push and email to to credentials.

You can user some options for sender. You can send notification exclude not required channels with option :only like:

user.send_notification('any_key.any_nested_key', name: 'HeyYou', only: [:push])

It will send notification only with push channel. Email will be skipped.

Channels options should pass to send method with associated channel names like:

user.send_notification(
  'any_key.any_nested_key', 
  name: 'HeyYou', 
  email: { layout: 'layout' }
)

In this example we pass option for email channel. We decide specific layout for 'any_key.any_nested_key' notification.

To create your custom channel you should create two classes:

1. HeyYou::Builders::<YOUR_CHANNEL_NAME>
2. HeyYou::Channels::<YOUR_CHANNEL_NAME>

You must extend your builder class from HeyYou::Builder::Base and realize class method #build. In this method you should fetch notification data for Your channel. For example:

class HeyYou::Builder::CustomNotifier < HeyYou::Builder::Base
  class << self
    attr_reader :header, :body, :icon
  
    def build
      @header = interpolate(ch_data['header'], options)
      @body = interpolate(ch_data['body'], options)
      @icon = options[:icon] || interpolate(ch_data['icon'], options)
    end
  end
end

Your notifications collection YAML file will contain next:

any_key:
  any_nested_key:
    push:
      # ...
    custom_notifier:
      header: Hello
      body: Hello, %{name}
      icon: 'icons.klass'

To check your builder you can call

notifier_data = HeyYou::Builder.new('any_key.any_nested_key', name: 'HeyYou').custom_notifier
notifier_data # => Instance of HeyYou::Builder::CustomNotifier
notifier_data.header # => Hello
notifier_data.body # => Hello, HeyYou
notifier_data.icon # => 'icons.klass'

You must extend your channel class from HeyYou::Channels::Base and realize class method #send!. This method pass two arguments: builder instance and to option. Finally, you channel should look like:

class HeyYou::Channels::CustomNotifier < HeyYou::Channels::Base
  class << self
    def send!(builder, to:)
      custom_notifier_client.send_message(
        text: builder.custom_notifier.text,
        token: to 
      )
    end
  end
end

If your channel require some configurations you should create class HeyYou::Config::<YOUR_CHANNEL_NAME>, extend it with Configurable module and add accessors for it. Example:

class HeyYou::Config::CustomNotifier
  extend HeyYou::Config::Configurable

  attr_accessor :secret_key
  
  def client
    YourProviderClass::Client.new(secret_key)
  end
end

If your attr is required you can add checking it in your channel:

class HeyYou::Channels::CustomNotifier < HeyYou::Channels::Base
  class << self
    def send!(builder, to:)
      return false unless credentials_present?
    
      HeyYou::Config.instance.custom_notifier.client.send_message(
        text: builder.custom_notifier.text,
        token: to 
      )
    end
    
    def required_credentials
      [:secret_key]
    end
  end
end

#credentials_present? method check exists required_credentials in your channel config.

Now, when you will send notification, it will be send with your channel too.

• Slack channel

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install.

Bug reports and pull requests are welcome on GitHub at https://github.com/QNester/hey-you. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.