Class: Pgai::CreateCloneService

Inherits:
Object
  • Object
show all
Defined in:
lib/pgai/create_clone_service.rb

Constant Summary collapse

HOSTNAME = 
"127.0.0.1"
CLONE_REFRESH_INTERVAL = 
0.2
PROGRESS_BAR_WIDTH = 
80

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id, env:, logger:) ⇒ CreateCloneService

Returns a new instance of CreateCloneService.



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# File 'lib/pgai/create_clone_service.rb', line 11

def initialize(id, env:, logger:)
  @id = id
  @env = env
  @logger = logger
end

Instance Attribute Details

#env ⇒ Object (readonly)

Returns the value of attribute env.



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# File 'lib/pgai/create_clone_service.rb', line 9

def env
  @env
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/pgai/create_clone_service.rb', line 9

def id
  @id
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/pgai/create_clone_service.rb', line 9

def logger
  @logger
end

Instance Method Details

#cached_clone_attributes ⇒ Object 



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# File 'lib/pgai/create_clone_service.rb', line 39

def cached_clone_attributes
  {
    id: id,
    port: clone_resource.db_object.port,
    password: clone_resource.db_object.password,
    user: clone_resource.db_object.username,
    host: HOSTNAME,
    remote_host: env.id,
    dbname: env.dbname,
    created_at: clone_resource.created_at,
    data_state_at: clone_resource.snapshot.data_state_at
  }
end

#clone_resource ⇒ Object 



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# File 'lib/pgai/create_clone_service.rb', line 53

def clone_resource
  @clone_resource ||= create_clone_resource
end

#create_clone_resource ⇒ Object 



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# File 'lib/pgai/create_clone_service.rb', line 31

def create_clone_resource
  @clone_resource = Resources::Remote::Clone.new(id: id).tap do |resource|
    resource.db_object = Resources::Remote::DbObject.new(db_name: env.dbname)
    resource.snapshot = find_snapshot
    resource.save
  end
end

#execute ⇒ Object 



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# File 'lib/pgai/create_clone_service.rb', line 17

def execute
  logger.info("Preparing clone ...")
  logger.debug { "Expected cloning time: #{env.expected_cloning_time}" }
  progress_bar.start

  create_clone_resource

  logger.debug { clone_resource.status_message }
  wait_for_clone_to_be_ready
  logger.debug { clone_resource.status_message }

  Resources::Local::Clone.new(cached_clone_attributes).tap(&:save)
end

#find_snapshot ⇒ Object 



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# File 'lib/pgai/create_clone_service.rb', line 57

def find_snapshot
  if env.snapshot
    Resources::Remote::Snapshot.find(env.snapshot)
  else
    Resources::Remote::Snapshot.latest
  end
end

#progress_bar ⇒ Object 



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# File 'lib/pgai/create_clone_service.rb', line 75

def progress_bar
  @progress_bar ||= TTY::ProgressBar.new("[:bar]", total: PROGRESS_BAR_WIDTH)
end

#steps ⇒ Object 



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# File 'lib/pgai/create_clone_service.rb', line 79

def steps
  @steps ||= (PROGRESS_BAR_WIDTH / env.expected_cloning_time).ceil
end

#wait_for_clone_to_be_ready ⇒ Object 



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# File 'lib/pgai/create_clone_service.rb', line 65

def wait_for_clone_to_be_ready
  loop do
    progress_bar.advance(steps)
    clone_resource.refresh
    break if clone_resource.ready?
    sleep(CLONE_REFRESH_INTERVAL)
  end
  progress_bar.finish
end