Class: Sequel::Postgres::Adapter

Inherits:
Object
  • Object
show all
Defined in:
lib/midori-contrib/sequel/postgres.rb

Overview

Midori Extension of sequel postgres through meta programming

Instance Method Summary collapse

Instance Method Details

#execute_query(sql, args) ⇒ Object 



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# File 'lib/midori-contrib/sequel/postgres.rb', line 16

def execute_query(sql, args)
  if Fiber.current == EventLoop.root_fiber
    # Block usage
    return execute_query_block(sql, args)
  else
    # Nonblock usage
    return execute_query_nonblock(sql, args)
  end
end

#execute_query_block ⇒ Array

Call a sql request asynchronously

Parameters:

  • sql (String) —

    sql request

  • args (Array) —

    args to send

Returns:

  • (Array) —

    sql query result



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# File 'lib/midori-contrib/sequel/postgres.rb', line 14

alias_method :execute_query_block, :execute_query

#execute_query_nonblock(sql, args) ⇒ Object 



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# File 'lib/midori-contrib/sequel/postgres.rb', line 26

def execute_query_nonblock(sql, args)
  @db.log_connection_yield(sql, self, args) do
    if POSTGRES_SOCKETS[self].nil?
      POSTGRES_SOCKETS[self] = IO::open(socket)
    end
    socket_object = POSTGRES_SOCKETS[self]
    await(Promise.new do |resolve|
      count = 0
      EventLoop.register(socket_object, :rw) do
        begin
          if (count == 0)
            # Writable
            unless is_busy
              send_query(sql)
              count += 1
            end
          else
            # Readable
            EventLoop.deregister(socket_object)
            resolve.call(get_result)
          end
        # For extra errors
        # :nocov:
        rescue => e
          resolve.call(PromiseException.new(e))
        # :nocov:
        end
      end
    end)
  end
end