Synnefo

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from __future__ import with_statement

from fabric.api import hide, env, settings, local, roles

from fabric.operations import run, put, get

import fabric

import re

import os

import shutil

import tempfile

import ast

from snfdeploy.lib import debug, Conf, Env, disable_color

from snfdeploy import massedit

from snfdeploy.components import *

from snfdeploy.roles import ROLES, CONFLICTS

def abort(action):

    def inner(*args, **kwargs):

        try:

            return action(*args, **kwargs)

        except BaseException as e:

            abort = kwargs.get("abort", True)

            force = env.force

            if not abort or force:

                 debug(env.host, "WARNING: command failed. Continuing anyway...")

            else:

                 fabric.utils.abort(e)

    return inner

@abort

def try_get(remote_path, local_path=None, **kwargs):

    if env.dry_run:

        debug(env.host, " * Fetching file localy... ", remote_path)

        return

    get(remote_path, local_path=local_path, **kwargs)

@abort

def try_put(local_path=None, remote_path=None, mode=0644, **kwargs):

    if env.dry_run:

        debug(env.host, " * Upload file... ", remote_path)

        return

    put(local_path=local_path, remote_path=remote_path, mode=mode)

@abort

def try_run(cmd, **kwargs):

    if env.dry_run:

        debug(env.host, cmd)

        return ""

    elif env.local:

        return local(cmd, capture=True, shell="/bin/bash")

    else:

        return run(cmd)

def install_package(package):

    debug(env.host, " * Installing package... ", package)

    apt_get = "export DEBIAN_FRONTEND=noninteractive ;" + \

              "apt-get install -y --force-yes "

    host_info = env.env.ips_info[env.host]

    env.env.update_packages(host_info.os)

    if ast.literal_eval(env.env.use_local_packages):

        with settings(warn_only=True):

            deb = local("ls %s/%s*%s_*.deb"

                        % (env.env.packages, package, host_info.os),

                        capture=True)

            if deb:

                debug(env.host,

                      " * Package %s found in %s..."

                      % (package, env.env.packages))

                try_put(deb, "/tmp/")

                try_run("dpkg -i /tmp/%s || "

                        % os.path.basename(deb) + apt_get + "-f")

                try_run("rm /tmp/%s" % os.path.basename(deb))

                return

    info = getattr(env.env, package)

    if info in \

            ["squeeze-backports", "squeeze", "stable",

             "testing", "unstable", "wheezy"]:

        apt_get += " -t %s %s " % (info, package)

    elif info:

        apt_get += " %s=%s " % (package, info)

    else:

        apt_get += package

    try_run(apt_get)

    return

def customize_settings_from_tmpl(tmpl, replace):

    debug(env.host, " * Customizing template %s..." % tmpl)

    local = env.env.templates + tmpl

    _, custom = tempfile.mkstemp()

    shutil.copyfile(local, custom)

    for k, v in replace.iteritems():

        regex = "re.sub('%{0}%', '{1}', line)".format(k.upper(), v)

        massedit.edit_files([custom], [regex], dry_run=False)

    return custom

def get_node_info(ident):

    if ident in env.env.ips_info:

        return env.env.ips_info[ident]

    elif ident in env.env.hosts_info:

        return env.env.hosts_info[ident]

    elif ident in env.env.nodes_info:

        return env.env.nodes_info[ident]

def GetFromComponent(component, remote, local):

    c = GetSynnefoComponent(component)

    c.debug(" * Downloading: ", remote)

    with settings(host_string=c.node_info.ip):

        try_get(remote, local)

def PutToComponent(component, local, remote):

    c = GetSynnefoComponent(component)

    c.debug(" * Uploading: ", remote)

    with settings(host_string=c.node_info.ip):

        try_put(local, remote)

def RunComponentMethod(component, method, *args, **kwargs):

    c = GetSynnefoComponent(component)

    c.debug(" * Running method: ", method)

    with settings(host_string=c.node_info.ip):

        fn = getattr(c, method)

        ret = ""

        for cmd in fn(*args, **kwargs):

            ret += try_run(cmd)

        return ret

def GetSynnefoComponent(component):

    node_info = get_node_info(env.host)

    env.password = node_info.passwd

    return component(node_info, env)

def conflicting_exists(component):

    conflict = CONFLICTS.get(component, [])

    for c in conflict:

        cs = env.env.status.check_status(env.host, c)

        if cs:

            debug(env.host, "Conflicting component already exists", c.__name__)

            return True

    return False

def SetupSynnefoRole(role):

    debug("Setting up base configuration for: ", role)

    try:

        components = ROLES.get(role)

    except KeyError:

        debug(env.host, "Please give a valid role")

        return

    for c in components:

        if conflicting_exists(c):

            continue

        status = env.env.status.check_status(env.host, c)

        if status:

            debug(env.host, "Base configuration already exists", c.__name__)

        else:

            AddSynnefoComponent(c)

            env.env.status.update_status(env.host, c, "ok")

            env.env.status.write_status()

class AddSynnefoComponent(object):

    def _run(self, commands):

        for c in commands:

            try_run(c)

    def _install(self, packages):

        for p in packages:

            install_package(p)

    def _configure(self, templates):

        for tmpl, replace, opts in templates:

            mode = opts.get("mode", 0644)

            remote = opts.get("remote", tmpl)

            custom = customize_settings_from_tmpl(tmpl, replace)

            try_put(custom, remote, mode)

            os.remove(custom)

    def __init__(self, component):

        self.c = GetSynnefoComponent(component)

        self.c.debug("Adding component..")

        self.c.debug(" * Checking prerequisites..")

        self._run(self.c.check())

        self.c.debug(" * Installing packages..")

        self._install(self.c.install())

        self.c.debug(" * Preparing configuration..")

        self._run(self.c.prepare())

        self.c.debug(" * Setting up configuration files..")

        self._configure(self.c.configure())

        self.c.debug(" * Restarting services..")

        self._run(self.c.restart())

        self.c.debug(" * Initializing setup..")

        self._run(self.c.initialize())

        self.c.debug(" * Testing setup..")

        self._run(self.c.test())