#!/usr/bin/env python

"""
The minionswarm script will start a group of salt minions with different ids
on a single system to test scale capabilities
"""
# pylint: disable=resource-leakage

import hashlib
import optparse
import os
import random
import shutil
import signal
import subprocess
import sys
import tempfile
import time
import uuid

import salt
import salt.utils.files
import salt.utils.yaml
import tests.support.runtests

OSES = [
    "Arch",
    "Ubuntu",
    "Debian",
    "CentOS",
    "Fedora",
    "Gentoo",
    "AIX",
    "Solaris",
]
VERS = [
    "2014.1.6",
    "2014.7.4",
    "2015.5.5",
    "2015.8.0",
]


def parse():
    """
    Parse the cli options
    """
    parser = optparse.OptionParser()
    parser.add_option(
        "-m",
        "--minions",
        dest="minions",
        default=5,
        type="int",
        help="The number of minions to make",
    )
    parser.add_option(
        "-M",
        action="store_true",
        dest="master_too",
        default=False,
        help="Run a local master and tell the minions to connect to it",
    )
    parser.add_option(
        "--master",
        dest="master",
        default="salt",
        help="The location of the salt master that this swarm will serve",
    )
    parser.add_option(
        "--name",
        "-n",
        dest="name",
        default="ms",
        help=(
            "Give the minions an alternative id prefix, this is used "
            "when minions from many systems are being aggregated onto "
            "a single master"
        ),
    )
    parser.add_option(
        "--rand-os",
        dest="rand_os",
        default=False,
        action="store_true",
        help="Each Minion claims a different os grain",
    )
    parser.add_option(
        "--rand-ver",
        dest="rand_ver",
        default=False,
        action="store_true",
        help="Each Minion claims a different version grain",
    )
    parser.add_option(
        "--rand-machine-id",
        dest="rand_machine_id",
        default=False,
        action="store_true",
        help="Each Minion claims a different machine id grain",
    )
    parser.add_option(
        "--rand-uuid",
        dest="rand_uuid",
        default=False,
        action="store_true",
        help="Each Minion claims a different UUID grain",
    )
    parser.add_option(
        "-k",
        "--keep-modules",
        dest="keep",
        default="",
        help="A comma delimited list of modules to enable",
    )
    parser.add_option(
        "-f",
        "--foreground",
        dest="foreground",
        default=False,
        action="store_true",
        help="Run the minions with debug output of the swarm going to the terminal",
    )
    parser.add_option(
        "--temp-dir",
        dest="temp_dir",
        default=None,
        help="Place temporary files/directories here",
    )
    parser.add_option(
        "--no-clean",
        action="store_true",
        default=False,
        help="Don't cleanup temporary files/directories",
    )
    parser.add_option(
        "--root-dir",
        dest="root_dir",
        default=None,
        help="Override the minion root_dir config",
    )
    parser.add_option(
        "--transport",
        dest="transport",
        default="zeromq",
        help="Declare which transport to use, default is zeromq",
    )
    parser.add_option(
        "--start-delay",
        dest="start_delay",
        default=0.0,
        type="float",
        help="Seconds to wait between minion starts",
    )
    parser.add_option(
        "-c",
        "--config-dir",
        default="",
        help="Pass in a configuration directory containing base configuration.",
    )
    parser.add_option("-u", "--user", default=tests.support.runtests.this_user())

    options, _args = parser.parse_args()

    opts = {}

    for key, val in options.__dict__.items():
        opts[key] = val

    return opts


class Swarm:
    """
    Create a swarm of minions
    """

    def __init__(self, opts):
        self.opts = opts

        # If given a temp_dir, use it for temporary files
        if opts["temp_dir"]:
            self.swarm_root = opts["temp_dir"]
        else:
            # If given a root_dir, keep the tmp files there as well
            if opts["root_dir"]:
                tmpdir = os.path.join(opts["root_dir"], "tmp")
            else:
                tmpdir = opts["root_dir"]
            self.swarm_root = tempfile.mkdtemp(
                prefix="mswarm-root", suffix=".d", dir=tmpdir
            )

        if self.opts["transport"] == "zeromq":
            self.pki = self._pki_dir()
        self.zfill = len(str(self.opts["minions"]))

        self.confs = set()

        random.seed(0)

    def _pki_dir(self):
        """
        Create the shared pki directory
        """
        path = os.path.join(self.swarm_root, "pki")
        if not os.path.exists(path):
            os.makedirs(path)

            print("Creating shared pki keys for the swarm on: {}".format(path))
            subprocess.call(
                "salt-key -c {0} --gen-keys minion --gen-keys-dir {0} "
                "--log-file {1} --user {2}".format(
                    path,
                    os.path.join(path, "keys.log"),
                    self.opts["user"],
                ),
                shell=True,
            )
            print("Keys generated")
        return path

    def start(self):
        """
        Start the magic!!
        """
        if self.opts["master_too"]:
            master_swarm = MasterSwarm(self.opts)
            master_swarm.start()
        minions = MinionSwarm(self.opts)
        minions.start_minions()
        print("Starting minions...")
        # self.start_minions()
        print("All {} minions have started.".format(self.opts["minions"]))
        print("Waiting for CTRL-C to properly shutdown minions...")
        while True:
            try:
                time.sleep(5)
            except KeyboardInterrupt:
                print("\nShutting down minions")
                self.clean_configs()
                break

    def shutdown(self):
        """
        Tear it all down
        """
        print("Killing any remaining running minions")
        subprocess.call('pkill -KILL -f "python.*salt-minion"', shell=True)
        if self.opts["master_too"]:
            print("Killing any remaining masters")
            subprocess.call('pkill -KILL -f "python.*salt-master"', shell=True)
        if not self.opts["no_clean"]:
            print("Remove ALL related temp files/directories")
            shutil.rmtree(self.swarm_root)
        print("Done")

    def clean_configs(self):
        """
        Clean up the config files
        """
        for path in self.confs:
            pidfile = "{}.pid".format(path)
            try:
                try:
                    with salt.utils.files.fopen(pidfile) as fp_:
                        pid = int(fp_.read().strip())
                    os.kill(pid, signal.SIGTERM)
                except ValueError:
                    pass
                if os.path.exists(pidfile):
                    os.remove(pidfile)
                if not self.opts["no_clean"]:
                    shutil.rmtree(path)
            except OSError:
                pass


class MinionSwarm(Swarm):
    """
    Create minions
    """

    def start_minions(self):
        """
        Iterate over the config files and start up the minions
        """
        self.prep_configs()
        for path in self.confs:
            cmd = "salt-minion -c {} --pid-file {}".format(path, "{}.pid".format(path))
            if self.opts["foreground"]:
                cmd += " -l debug &"
            else:
                cmd += " -d &"
            subprocess.call(cmd, shell=True)
            time.sleep(self.opts["start_delay"])

    def mkconf(self, idx):
        """
        Create a config file for a single minion
        """
        data = {}
        if self.opts["config_dir"]:
            spath = os.path.join(self.opts["config_dir"], "minion")
            with salt.utils.files.fopen(spath) as conf:
                data = salt.utils.yaml.safe_load(conf) or {}
        minion_id = "{}-{}".format(self.opts["name"], str(idx).zfill(self.zfill))

        dpath = os.path.join(self.swarm_root, minion_id)
        if not os.path.exists(dpath):
            os.makedirs(dpath)

        data.update(
            {
                "id": minion_id,
                "user": self.opts["user"],
                "cachedir": os.path.join(dpath, "cache"),
                "master": self.opts["master"],
                "log_file": os.path.join(dpath, "minion.log"),
                "grains": {},
            }
        )

        if self.opts["transport"] == "zeromq":
            minion_pkidir = os.path.join(dpath, "pki")
            if not os.path.exists(minion_pkidir):
                os.makedirs(minion_pkidir)
                minion_pem = os.path.join(self.pki, "minion.pem")
                minion_pub = os.path.join(self.pki, "minion.pub")
                shutil.copy(minion_pem, minion_pkidir)
                shutil.copy(minion_pub, minion_pkidir)
            data["pki_dir"] = minion_pkidir
        elif self.opts["transport"] == "tcp":
            data["transport"] = "tcp"

        if self.opts["root_dir"]:
            data["root_dir"] = self.opts["root_dir"]

        path = os.path.join(dpath, "minion")

        if self.opts["keep"]:
            keep = self.opts["keep"].split(",")
            modpath = os.path.join(os.path.dirname(salt.__file__), "modules")
            fn_prefixes = (fn_.partition(".")[0] for fn_ in os.listdir(modpath))
            ignore = [fn_prefix for fn_prefix in fn_prefixes if fn_prefix not in keep]
            data["disable_modules"] = ignore

        if self.opts["rand_os"]:
            data["grains"]["os"] = random.choice(OSES)
        if self.opts["rand_ver"]:
            data["grains"]["saltversion"] = random.choice(VERS)
        if self.opts["rand_machine_id"]:
            data["grains"]["machine_id"] = hashlib.md5(minion_id).hexdigest()
        if self.opts["rand_uuid"]:
            data["grains"]["uuid"] = str(uuid.uuid4())

        with salt.utils.files.fopen(path, "w+") as fp_:
            salt.utils.yaml.safe_dump(data, fp_)
        self.confs.add(dpath)

    def prep_configs(self):
        """
        Prepare the confs set
        """
        for idx in range(self.opts["minions"]):
            self.mkconf(idx)


class MasterSwarm(Swarm):
    """
    Create one or more masters
    """

    def __init__(self, opts):
        super().__init__(opts)
        self.conf = os.path.join(self.swarm_root, "master")

    def start(self):
        """
        Prep the master start and fire it off
        """
        # sys.stdout for no newline
        sys.stdout.write("Generating master config...")
        self.mkconf()
        print("done")

        sys.stdout.write("Starting master...")
        self.start_master()
        print("done")

    def start_master(self):
        """
        Do the master start
        """
        cmd = "salt-master -c {} --pid-file {}".format(
            self.conf, "{}.pid".format(self.conf)
        )
        if self.opts["foreground"]:
            cmd += " -l debug &"
        else:
            cmd += " -d &"
        subprocess.call(cmd, shell=True)

    def mkconf(self):  # pylint: disable=W0221
        """
        Make a master config and write it'
        """
        data = {}
        if self.opts["config_dir"]:
            spath = os.path.join(self.opts["config_dir"], "master")
            with salt.utils.files.fopen(spath) as conf:
                data = salt.utils.yaml.safe_load(conf)
        data.update(
            {
                "log_file": os.path.join(self.conf, "master.log"),
                "open_mode": True,  # TODO Pre-seed keys
            }
        )

        os.makedirs(self.conf)
        path = os.path.join(self.conf, "master")

        with salt.utils.files.fopen(path, "w+") as fp_:
            salt.utils.yaml.safe_dump(data, fp_)

    def shutdown(self):
        print("Killing master")
        subprocess.call('pkill -KILL -f "python.*salt-master"', shell=True)
        print("Master killed")


# pylint: disable=C0103
if __name__ == "__main__":
    swarm = Swarm(parse())
    try:
        swarm.start()
    finally:
        swarm.shutdown()