api_19_android.rb

# Find open webviews on API 19 Android emulator.

def print_webviews
  webviews = `adb shell cat /proc/net/unix`
  webview_prefix = '@webview_devtools_remote_'
  webviews = webviews.split("\r\n").reject { |l| ! l.include?(webview_prefix) }

  # one pid may have many webviews 
  pids = webviews.map { |view| view.split(webview_prefix).last }.uniq

  r = []
  pids.each { |pid| r << [ pid_to_package(pid), pid ] }
  r
end
 
def pid_to_package pid
  ps = `adb shell ps`.split("\r\n").reject { |l| ! l.include?(pid) }
  ps.first.split(' ').last
end
 
# [['com.my.app', '2373']]
print_webviews

# todo: what address is the webview using?
# https://github.com/mirrors/chromium/blob/master/chrome/browser/devtools/android_device.cc 
# https://github.com/mirrors/chromium/blob/master/chrome/browser/devtools/port_forwarding_controller.cc
# https://github.com/mirrors/chromium/blob/master/chrome/browser/devtools/devtools_adb_bridge_browsertest.cc

# the pid is listed in jdwp output
#  adb jdwp

# attempt connecting to the unix socket

# local port, remote_abstract
# src/chrome/test/chromedriver/chrome/adb_impl.cc
# adb forward tcp:8000 localabstract:4558

require 'socket'
socket = TCPSocket.open('localhost', 4594);
socket.print "GET /json HTTP/1.1\r\n\r\n"; 
socket.read