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Contents
module Celerity
class ViewerConnection
#
# Create a new connection to the given host/port
#
def self.create(host, port)
# if the connection fails, we won't spend time loading json
socket = TCPSocket.new(host, port)
require "json"
new(socket)
end
def initialize(socket)
@socket = socket
end
#
# Tells the viewer to render the given HTML, with the given URL as base url.
#
def render_html(html, url)
send_data('method' => 'page_changed', 'html' => html, 'url' => url)
end
#
# Tells the viewer to save a screenshot of the current page to the given path.
# May not be available on all viewers.
#
def save(path)
send_data('method' => 'save', 'path' => path)
end
#
# Tells the viewer to dump the render tree to the given path.
# Only available in the Qt viewer.
#
def save_render_tree(path)
send_data('method' => 'save_render_tree', 'path' => path)
end
#
# Get the currently rendered page as a Base64-encoded PNG image.
# Only available in the Qt viewer.
#
def image_data
send_data('method' => 'image_data')
data = read_data
data['image'] || data['error']
end
#
# Close the connection.
#
def close
@socket.close rescue nil
end
private
def send_data(msg)
json = msg.to_json
data = "Content-Length: #{json.size}\n\n#{json}"
@socket.write data
@socket.flush
nil
end
def read_data
buf = ''
until buf =~ /\n\n\z/ || @socket.eof? || @socket.closed?
buf << @socket.read(1).to_s
end
return if buf.empty?
length = buf[/Content-Length: (\d+)/, 1].to_i
JSON.parse @socket.read(length)
end
end
end
Version data entries
46 entries across 46 versions & 8 rubygems