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#!/usr/bin/env python
#
# Copyright 2015 Codethink Ltd
#
# This program 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; version 2 of the License.
#
# This program 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.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

'''openstack/tester

This script tests an image on openstack.

'''

import os
import pipes
import socket
import time
import uuid
import yaml

import paramiko
import cliapp

from novaclient import client

class TimeoutError(cliapp.AppException):

    """Error to be raised when a connection waits too long"""

    def __init__(self, msg):
        super(TimeoutError, self).__init__(msg)


def delete_image(hostname):
    # TODO: Do all this stuff properly with python novaclient
    # Remove an image from the openstack tenancy
    print "Deleting %s test disc image" % (hostname)
    try:
        cliapp.runcmd(['nova', 'image-delete', hostname])
    except cliapp.AppException as e:
        # TODO: Stop assuming that image-delete failed because it was
        #       already removed
        print "- Failed"
        pass

def delete_instance_and_image(hostname):
    # TODO: Do all this stuff properly with python novaclient
    # Stop and remove VM, and its image
    print "Deleting %s test instance" % (hostname)
    try:
        cliapp.runcmd(['nova', 'delete', hostname])
    except cliapp.AppException as e:
        # TODO: Stop assuming that delete failed because the instance
        #       wasn't running
        print "- Failed"
        pass

    # Sleep for a bit, or nova silently fails to delete the image
    # TODO: Test whether the image has been deleted in a retry loop.
    time.sleep(20)

    delete_image(hostname)


class DeployedSystemInstance(object):

    def __init__(self, deployment, ip_addr, hostname):
        self.deployment = deployment
        self.ip_address = ip_addr
        self.hostname = hostname
        self.connection = None

    def runcmd(self, cmd):
        tran = self.connection.get_transport()
        chan = tran.open_session()
        chan.get_pty()
        f = chan.makefile()
        chan.exec_command(cmd)
        print f.read()

    def _wait_for_dhcp(self, timeout):
        '''Block until given hostname resolves successfully.

        Raises TimeoutError if the hostname has not appeared in 'timeout'
        seconds.

        '''
        start_time = time.time()
        while True:
            try:
                socket.gethostbyname(self.ip_address)
                return
            except socket.gaierror:
                pass
            if time.time() > start_time + timeout:
                raise TimeoutError("Host %s did not appear after %i seconds" %
                                   (self.ip_address, timeout))
            time.sleep(0.5)

    def _wait_for_ssh(self, timeout):
        """Wait until the deployed VM is responding via SSH"""
        print('Attempting to connect to test instance via SSH:')
        start_time = time.time()
        while True:
            try:
                # TODO: Stop assuming we ssh into test instances as root
                ssh = paramiko.SSHClient()
                ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
                ssh.connect(self.ip_address, username='root')
                self.connection = ssh
                print('SSH connection established.')
                return
            except Exception as e:
                print(e)
                # TODO: Stop assuming the ssh part of the command is what failed
                if time.time() > start_time + timeout:
                    raise TimeoutError("%s sshd did not start after %i seconds"
                                       % (self.ip_address, timeout))
                time.sleep(0.5)

    def _wait_for_cloud_init(self, timeout):
        """Wait until cloud init has resized the disc"""
        start_time = time.time()
        while True:
            try:
                out = self.runcmd(['sh', '-c',
                              'test -e "$1" && echo exists || echo does not exist',
                              '-',
                              '/root/cloud-init-finished'])
            except:
                import traceback
                traceback.print_exc()
                raise
            if out.strip() == 'exists':
                return
            if time.time() > start_time + timeout:
                raise TimeoutError("Disc size not increased after %i seconds"
                                   % (timeout))
            time.sleep(3)

    def wait_until_online(self, timeout=180):
        self._wait_for_dhcp(timeout)
        self._wait_for_ssh(timeout)
        #self._wait_for_cloud_init(timeout)
        print "Test system %s ready to run tests." % (self.hostname)

    def delete(self):
        if self.connection != None:
            self.connection.close()
        delete_instance_and_image(self.hostname)


class Deployment(object):

    def __init__(self, net_id, image_file, flavour):
        self.net_id = net_id
        self.image_file = image_file
        self.flavour = flavour

    def deploy(self):
        hostname = str(uuid.uuid4())

        # Deploy the image to openstack
        # TODO: Ensure this is cleaned up when something raises an exception
        print('Uploading image to openstack host')
        args = ['glance', 'image-create', '--progress',
                '--name', hostname,
                '--disk-format', 'raw',
                '--container-format', 'bare',
                '--file', self.image_file]
        cliapp.runcmd(args, stdin=None, stdout=None, stderr=None)

        # Get a novaclient object
        nc = client.Client(2,
                           os.environ['OS_USERNAME'],
                           os.environ['OS_PASSWORD'],
                           os.environ['OS_TENANT_NAME'],
                           os.environ['OS_AUTH_URL'])

        # Boot an instance from the image
        # TODO: Ensure this is cleaned up when something raises an exception
        # TODO: use python-novaclient
        print('Booting an instance from the image')
        args = ['nova', 'boot',
                '--flavor', self.flavour,
                '--image', hostname,
                #'--user-data', '/usr/lib/mason/os-init-script',
                '--nic', "net-id=%s" % (self.net_id),
                hostname]
        output = cliapp.runcmd(args)

        # Print nova boot output, with adminPass line removed
        output_lines = output.split('\n')
        for line in output_lines:
            if line.find('adminPass') != -1:
                password_line = line
        output_lines.remove(password_line)
        output = '\n'.join(output_lines)
        print output

        # Sleep for a bit, or nova explodes when trying to assign IP address
        time.sleep(20)

        # Assign a floating IP address
        print('Requesting a floating IP address')
        for _ in xrange(5):
            ip_list = nc.floating_ips.list()
            free_ip = None
            for ip in ip_list:
                if ip.instance_id == None:
                    free_ip = ip
                    break
            else:
                free_ip = nc.floating_ips.create(
                              nc.floating_ip_pools.list()[0].name)
            if free_ip != None:
                instance = nc.servers.find(name=hostname)
                # TODO: switch back to cli tool, as python
                #       approach gave error.
                instance.add_floating_ip(free_ip)
                ip_addr = free_ip.ip
                break
        else:
            delete_instance_and_image(hostname)
            raise cliapp.AppException('Could not get a floating IP')

        # Print the IP address
        print "IP address for instance %s: %s" % (hostname, ip_addr)

        return DeployedSystemInstance(self, ip_addr, hostname)

class ReleaseApp(cliapp.Application):

    """Cliapp application which handles automatic builds and tests"""

    def add_settings(self):
        """Add the command line options needed"""
        group_main = 'Program Options'
        self.settings.string(['net-id'],
                             'Openstack network ID',
                             default=None,
                             group=group_main)
        self.settings.string(['image-file'],
                             'Path to system image to test',
                             default=None,
                             group=group_main)
        self.settings.string(['flavour'],
                             'Name of flavour to use for instance',
                             default=None,
                             group=group_main)

    def run_tests(self, instance, tests):
        instance.wait_until_online()

        for test in tests:
            with open(test, 'r') as stream:
                data = yaml.load(stream)

            if data == None:
                continue
            if 'name' not in data:
                print('Bad test: no name')
                continue
            if 'commands' not in data:
                print('Bad test: no commands')
                continue

            print('Running test: ' + data['name'])
            for cmd in data['commands']:
                print('$ ' + cmd)
                instance.runcmd(cmd)

    def deploy_and_test_systems(self, tests):
        """Run the deployments and tests"""

        deployment = Deployment(self.settings['net-id'],
                                self.settings['image-file'],
                                self.settings['flavour'])

        instance = deployment.deploy()
        try:
            self.run_tests(instance, tests)
        finally:
            instance.delete()

    def process_args(self, args):
        """Process the command line args and kick off the builds/tests"""
        for setting in ('net-id', 'image-file', 'flavour'):
            self.settings.require(setting)

        if len(args) == 0:
            print('Warning: No tests specified.')

        self.deploy_and_test_systems(args)


if __name__ == '__main__':
    ReleaseApp().run()