Subclass rather than copy default Callback plugin

We actually don't override much of the default callback plugin, so this
can actually just be the code we wrote.

Change-Id: I00b77f6fe28f2f6c707bda44520248f103852a90
diff --git a/zuul/ansible/callback/zuul_stream.py b/zuul/ansible/callback/zuul_stream.py
index e47cb4f..8f9bcd2 100644
--- a/zuul/ansible/callback/zuul_stream.py
+++ b/zuul/ansible/callback/zuul_stream.py
@@ -1,13 +1,11 @@
-# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
+# Copyright 2017 Red Hat, Inc.
 #
-# This file is part of Ansible
-#
-# Ansible is free software: you can redistribute it and/or modify
+# Zuul is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
 #
-# Ansible is distributed in the hope that it will be useful,
+# Zuul is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
@@ -15,18 +13,12 @@
 # You should have received a copy of the GNU General Public License
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
-# Make coding more python3-ish
-from __future__ import (absolute_import, division, print_function)
-__metaclass__ = type
-
 import os
 import multiprocessing
 import socket
 import time
 
-from ansible import constants as C
-from ansible.plugins import callback
-from ansible.utils.color import colorize, hostcolor
+from ansible.plugins.callback import default
 
 
 def linesplit(socket):
@@ -46,7 +38,7 @@
         yield buff
 
 
-class CallbackModule(callback.CallbackBase):
+class CallbackModule(default.CallbackModule):
 
     '''
     This is the Zuul streaming callback. It's based on the default
@@ -59,135 +51,13 @@
 
     def __init__(self):
 
-        self._play = None
+        super(CallbackModule, self).__init__()
         self._task = None
-        self._last_task_banner = None
-        self._untrusted = C.DISPLAY_ARGS_TO_STDOUT
         self._daemon_running = False
         self._daemon_stamp = 'daemon-stamp-%s'
         self._host_dict = {}
-        super(CallbackModule, self).__init__()
 
-    def _should_verbose(self, result, level=0):
-        return ((self._display.verbosity > level
-                 or '_ansible_verbose_always' in result._result)
-                and '_ansible_verbose_override' not in result._result)
-
-    def v2_runner_on_failed(self, result, ignore_errors=False):
-
-        if (self._play.strategy == 'free'
-                and self._last_task_banner != result._task._uuid):
-            self._print_task_banner(result._task)
-
-        delegated_vars = result._result.get('_ansible_delegated_vars', None)
-        if 'exception' in result._result:
-            if self._display.verbosity < 3:
-                # extract just the actual error message from the exception text
-                error = result._result['exception'].strip().split('\n')[-1]
-                msg = ("An exception occurred during task execution. To see"
-                       " the full traceback, use -vvv."
-                       " The error was: %s" % error)
-            else:
-                msg = ("An exception occurred during task execution. The full"
-                       " traceback is:\n" + result._result['exception'])
-
-            self._display.display(msg)
-
-        self._handle_warnings(result._result)
-
-        if result._task.loop and 'results' in result._result:
-            self._process_items(result)
-
-        else:
-            if delegated_vars:
-                self._display.display(
-                    "fatal: [%s -> %s]: FAILED! => %s" % (
-                        result._host.get_name(),
-                        delegated_vars['ansible_host'],
-                        self._dump_results(result._result)))
-            else:
-                self._display.display(
-                    "fatal: [%s]: FAILED! => %s" % (
-                        result._host.get_name(),
-                        self._dump_results(result._result)))
-
-        if ignore_errors:
-            self._display.display("...ignoring")
-
-    def v2_runner_on_ok(self, result):
-
-        if (self._play.strategy == 'free'
-                and self._last_task_banner != result._task._uuid):
-            self._print_task_banner(result._task)
-
-        self._clean_results(result._result, result._task.action)
-
-        delegated_vars = result._result.get('_ansible_delegated_vars', None)
-        self._clean_results(result._result, result._task.action)
-        if result._task.action in ('include', 'include_role'):
-            return
-        elif result._result.get('changed', False):
-            if delegated_vars:
-                msg = "changed: [%s -> %s]" % (
-                    result._host.get_name(), delegated_vars['ansible_host'])
-            else:
-                msg = "changed: [%s]" % result._host.get_name()
-        else:
-            if delegated_vars:
-                msg = "ok: [%s -> %s]" % (
-                    result._host.get_name(), delegated_vars['ansible_host'])
-            else:
-                msg = "ok: [%s]" % result._host.get_name()
-
-        self._handle_warnings(result._result)
-
-        if result._task.loop and 'results' in result._result:
-            self._process_items(result)
-        else:
-
-            if self._should_verbose(result):
-                msg += " => %s" % (self._dump_results(result._result),)
-            self._display.display(msg)
-
-    def v2_runner_on_skipped(self, result):
-        if C.DISPLAY_SKIPPED_HOSTS:
-            if (self._play.strategy == 'free'
-                    and self._last_task_banner != result._task._uuid):
-                self._print_task_banner(result._task)
-
-            if result._task.loop and 'results' in result._result:
-                self._process_items(result)
-            else:
-                msg = "skipping: [%s]" % result._host.get_name()
-                if self._should_verbose(result):
-                    msg += " => %s" % self._dump_results(result._result)
-                self._display.display(msg)
-
-    def v2_runner_on_unreachable(self, result):
-        if (self._play.strategy == 'free'
-                and self._last_task_banner != result._task._uuid):
-            self._print_task_banner(result._task)
-
-        delegated_vars = result._result.get('_ansible_delegated_vars', None)
-        if delegated_vars:
-            self._display.display(
-                "fatal: [%s -> %s]: UNREACHABLE! => %s" % (
-                    result._host.get_name(),
-                    delegated_vars['ansible_host'],
-                    self._dump_results(result._result)))
-        else:
-            self._display.display(
-                "fatal: [%s]: UNREACHABLE! => %s" % (
-                    result._host.get_name(),
-                    self._dump_results(result._result)))
-
-    def v2_playbook_on_no_hosts_matched(self):
-        self._display.display("skipping: no hosts matched")
-
-    def v2_playbook_on_no_hosts_remaining(self):
-        self._display.banner("NO MORE HOSTS LEFT")
-
-    def read_log(self, host, ip):
+    def _read_log(self, host, ip):
         self._display.display("[%s] starting to log" % host)
         s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         while True:
@@ -200,6 +70,10 @@
             for line in linesplit(s):
                 self._display.display("[%s] %s " % (host, line.strip()))
 
+    def v2_playbook_on_play_start(self, play):
+        self._play = play
+        super(CallbackModule, self).v2_playbook_on_play_start(play)
+
     def v2_playbook_on_task_start(self, task, is_conditional):
         self._task = task
 
@@ -212,171 +86,9 @@
                 daemon_stamp = self._daemon_stamp % host
                 if not os.path.exists(daemon_stamp):
                     self._host_dict[host] = ip
-                    open(daemon_stamp, 'w').write('')
+                    # Touch stamp file
+                    open(daemon_stamp, 'w').close()
                     p = multiprocessing.Process(
-                        target=self.read_log, args=(host, ip))
+                        target=self._read_log, args=(host, ip))
                     p.daemon = True
                     p.start()
-
-    def _print_task_banner(self, task):
-        # args can be specified as no_log in several places: in the task or in
-        # the argument spec.  We can check whether the task is no_log but the
-        # argument spec can't be because that is only run on the target
-        # machine and we haven't run it there yet at this time.
-        #
-        # The zuul runner passes a flag indicating trusted status of a job. We
-        # want to not print any args for jobs that are trusted, because those
-        # args might have secrets.
-        #
-        # Those tasks in the trusted jobs should also be explicitly marked
-        # no_log - but this should be some additional belt and suspenders.
-        args = ''
-        if not task.no_log and self._untrusted:
-            args = u', '.join(u'%s=%s' % a for a in task.args.items())
-            args = u' %s' % args
-
-        self._display.banner(u"TASK [%s%s]" % (task.get_name().strip(), args))
-        if self._display.verbosity >= 2:
-            path = task.get_path()
-            if path:
-                self._display.display(u"task path: %s" % path)
-
-        self._last_task_banner = task._uuid
-
-    def v2_playbook_on_cleanup_task_start(self, task):
-        self._display.banner("CLEANUP TASK [%s]" % task.get_name().strip())
-
-    def v2_playbook_on_handler_task_start(self, task):
-        self._display.banner("RUNNING HANDLER [%s]" % task.get_name().strip())
-
-    def v2_playbook_on_play_start(self, play):
-        name = play.get_name().strip()
-        if not name:
-            msg = u"PLAY"
-        else:
-            msg = u"PLAY [%s]" % name
-
-        self._play = play
-
-        self._display.banner(msg)
-
-    def v2_on_file_diff(self, result):
-        if result._task.loop and 'results' in result._result:
-            for res in result._result['results']:
-                if 'diff' in res and res['diff'] and res.get('changed', False):
-                    diff = self._get_diff(res['diff'])
-                    if diff:
-                        self._display.display(diff)
-        elif ('diff' in result._result and result._result['diff']
-              and result._result.get('changed', False)):
-            diff = self._get_diff(result._result['diff'])
-            if diff:
-                self._display.display(diff)
-
-    def v2_runner_item_on_ok(self, result):
-        delegated_vars = result._result.get('_ansible_delegated_vars', None)
-        if result._task.action in ('include', 'include_role'):
-            return
-        elif result._result.get('changed', False):
-            msg = 'changed'
-        else:
-            msg = 'ok'
-
-        if delegated_vars:
-            msg += ": [%s -> %s]" % (
-                result._host.get_name(), delegated_vars['ansible_host'])
-        else:
-            msg += ": [%s]" % result._host.get_name()
-
-        msg += " => (item=%s)" % (self._get_item(result._result),)
-
-        if self._should_verbose(result):
-            msg += " => %s" % self._dump_results(result._result)
-        self._display.display(msg)
-
-    def v2_runner_item_on_failed(self, result):
-        delegated_vars = result._result.get('_ansible_delegated_vars', None)
-        if 'exception' in result._result:
-            if self._display.verbosity < 3:
-                # extract just the actual error message from the exception text
-                error = result._result['exception'].strip().split('\n')[-1]
-                msg = ("An exception occurred during task execution."
-                       " To see the full traceback, use -vvv. The error was:"
-                       " %s") % error
-            else:
-                msg = ("An exception occurred during task execution. The full"
-                       "traceback is:\n" + result._result['exception'])
-
-            self._display.display(msg)
-
-        msg = "failed: "
-        if delegated_vars:
-            msg += "[%s -> %s]" % (
-                result._host.get_name(), delegated_vars['ansible_host'])
-        else:
-            msg += "[%s]" % (result._host.get_name())
-
-        self._handle_warnings(result._result)
-        self._display.display(
-            msg + " (item=%s) => %s" % (
-                self._get_item(result._result),
-                self._dump_results(result._result)))
-
-    def v2_runner_item_on_skipped(self, result):
-        if C.DISPLAY_SKIPPED_HOSTS:
-            msg = "skipping: [%s] => (item=%s) " % (
-                result._host.get_name(), self._get_item(result._result))
-            if self._should_verbose(result):
-                msg += " => %s" % self._dump_results(result._result)
-            self._display.display(msg)
-
-    def v2_playbook_on_include(self, included_file):
-        msg = 'included: %s for %s' % (
-            included_file._filename,
-            ", ".join([h.name for h in included_file._hosts]))
-        self._display.display(msg)
-
-    def v2_playbook_on_stats(self, stats):
-        self._display.banner("PLAY RECAP")
-
-        hosts = sorted(stats.processed.keys())
-        for h in hosts:
-            t = stats.summarize(h)
-
-            # False and None mean to not use color. In this case, colorize and
-            # hostcolor will be providing formatting, not color.
-            self._display.display(u"%s : %s %s %s %s" % (
-                hostcolor(h, t, False),
-                colorize(u'ok', t['ok'], None),
-                colorize(u'changed', t['changed'], None),
-                colorize(u'unreachable', t['unreachable'], None),
-                colorize(u'failed', t['failures'], None)),
-            )
-        for host in self._host_dict.keys():
-            daemon_stamp = self._daemon_stamp % host
-            if os.path.exists(daemon_stamp):
-                os.unlink(daemon_stamp)
-
-    def v2_playbook_on_start(self, playbook):
-        if self._display.verbosity > 1:
-            from os.path import basename
-            self._display.banner(
-                "PLAYBOOK: %s" % basename(playbook._file_name))
-
-        if self._display.verbosity > 3:
-            if self._options is not None:
-                for option in dir(self._options):
-                    if option.startswith('_') or option in [
-                            'read_file', 'ensure_value', 'read_module']:
-                        continue
-                    val = getattr(self._options, option)
-                    if val:
-                        self._display.vvvv('%s: %s' % (option, val))
-
-    def v2_runner_retry(self, result):
-        msg = "FAILED - RETRYING: %s (%d retries left)." % (
-            result._task,
-            result._result['retries'] - result._result['attempts'])
-        if self._should_verbose(result, level=2):
-            msg += "Result was: %s" % self._dump_results(result._result)
-        self._display.display(msg, color=C.COLOR_DEBUG)