kopia lustrzana https://github.com/piku/piku
450 wiersze
14 KiB
Python
450 wiersze
14 KiB
Python
#!/usr/bin/env python
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import os, sys, stat, re, shutil, socket
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from click import argument, command, group, option, secho as echo
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from collections import defaultdict, deque
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from glob import glob
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from os.path import abspath, basename, dirname, exists, getmtime, join, splitext
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from subprocess import call
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from time import sleep
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# === Globals - all tweakable settings are here ===
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PIKU_ROOT = os.environ.get('PIKU_ROOT', join(os.environ['HOME'],'.piku'))
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APP_ROOT = abspath(join(PIKU_ROOT, "apps"))
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ENV_ROOT = abspath(join(PIKU_ROOT, "envs"))
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GIT_ROOT = abspath(join(PIKU_ROOT, "repos"))
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LOG_ROOT = abspath(join(PIKU_ROOT, "logs"))
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UWSGI_AVAILABLE = abspath(join(PIKU_ROOT, "uwsgi-available"))
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UWSGI_ENABLED = abspath(join(PIKU_ROOT, "uwsgi-enabled"))
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UWSGI_ROOT = abspath(join(PIKU_ROOT, "uwsgi"))
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# === Utility functions ===
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def sanitize_app_name(app):
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"""Sanitize the app name and build matching path"""
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app = "".join(c for c in app if c.isalnum() or c in ('.','_')).rstrip()
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return app
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def get_free_port(address=""):
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"""Find a free TCP port (entirely at random)"""
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.bind((address,0))
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port = s.getsockname()[1]
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s.close()
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return port
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def setup_authorized_keys(ssh_fingerprint, script_path, pubkey):
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"""Sets up an authorized_keys file to redirect SSH commands"""
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authorized_keys = join(os.environ['HOME'],'.ssh','authorized_keys')
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if not exists(dirname(authorized_keys)):
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os.makedirs(dirname(authorized_keys))
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# Restrict features and force all SSH commands to go through our script
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with open(authorized_keys, 'a') as h:
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h.write("""command="FINGERPRINT=%(ssh_fingerprint)s NAME=default %(script_path)s $SSH_ORIGINAL_COMMAND",no-agent-forwarding,no-user-rc,no-X11-forwarding,no-port-forwarding %(pubkey)s\n""" % locals())
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# TODO: allow for multiple workers
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def parse_procfile(filename):
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"""Parses a Procfile and returns the worker types. Only one worker of each type is allowed."""
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workers = {}
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if not exists(filename):
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return None
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with open(filename, 'r') as procfile:
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for line in procfile:
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try:
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kind, command = map(lambda x: x.strip(), line.split(":", 1))
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if kind in ['web', 'worker', 'wsgi']:
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workers[kind] = command
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except:
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echo("Warning: unrecognized Procfile declaration '%s'" % line, fg='yellow')
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if not len(workers):
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return None
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# WSGI trumps regular web workers
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if 'wsgi' in workers:
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if 'web' in workers:
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del(workers['web'])
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return workers
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def parse_settings(filename, env={}):
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"""Parses a settings file and returns a dict with environment variables"""
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def expandvars(buffer, env, default=None, skip_escaped=False):
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def replace_var(match):
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return env.get(match.group(2) or match.group(1), match.group(0) if default is None else default)
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pattern = (r'(?<!\\)' if skip_escaped else '') + r'\$(\w+|\{([^}]*)\})'
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return re.sub(pattern, replace_var, buffer)
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if not exists(filename):
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return None
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with open(filename, 'r') as settings:
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for line in settings:
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try:
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k, v = map(lambda x: x.strip(), line.split("=", 1))
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env[k] = expandvars(v, env)
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except:
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echo("Warning: malformed setting '%s'" % line, fg='yellow')
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return env
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def do_deploy(app):
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"""Deploy an app by resetting the work directory"""
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app_path = join(APP_ROOT, app)
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procfile = join(app_path, 'Procfile')
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log_path = join(LOG_ROOT, app)
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env = {'GIT_WORK_DIR': app_path}
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if exists(app_path):
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echo("-----> Deploying app '%s'" % app, fg='green')
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call('git pull --quiet', cwd=app_path, env=env, shell=True)
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call('git checkout -f', cwd=app_path, env=env, shell=True)
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if not exists(log_path):
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os.makedirs(log_path)
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workers = parse_procfile(procfile)
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if workers:
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if exists(join(app_path, 'requirements.txt')):
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echo("-----> Python app detected.", fg='green')
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deploy_python(app, workers)
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else:
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echo("-----> Could not detect runtime!", fg='red')
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# TODO: detect other runtimes
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else:
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echo("Error: Procfile not found for app '%s'." % app, fg='red')
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else:
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echo("Error: app '%s' not found." % app, fg='red')
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def deploy_python(app, workers):
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"""Deploy a Python application"""
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virtualenv_path = join(ENV_ROOT, app)
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requirements = join(APP_ROOT, app, 'requirements.txt')
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first_time = False
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if not exists(virtualenv_path):
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echo("-----> Creating virtualenv for '%s'" % app, fg='green')
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os.makedirs(virtualenv_path)
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call('virtualenv %s' % app, cwd=ENV_ROOT, shell=True)
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first_time = True
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if first_time or getmtime(requirements) > getmtime(virtualenv_path):
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echo("-----> Running pip for '%s'" % app, fg='green')
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activation_script = join(virtualenv_path,'bin','activate_this.py')
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execfile(activation_script, dict(__file__=activation_script))
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call('pip install -r %s' % requirements, cwd=virtualenv_path, shell=True)
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create_workers(app, workers)
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def create_workers(app, workers):
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"""Create all workers for an app"""
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ordinals = defaultdict(int)
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# the Python virtualenv
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virtualenv_path = join(ENV_ROOT, app)
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# Settings shipped with the app
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env_file = join(APP_ROOT, app, 'ENV')
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# Custom overrides
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settings = join(ENV_ROOT, app, 'ENV')
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env = {
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'PATH': os.environ['PATH'],
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'VIRTUAL_ENV': virtualenv_path,
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'PORT': str(get_free_port()),
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'PWD': dirname(env_file),
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}
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# TODO: perform $ENV_VAR expansion using os.path.expandvars and a safe context
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# Load environment variables shipped with repo (if any)
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if exists(env_file):
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env.update(parse_settings(env_file, env))
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# Override with custom settings (if any)
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if exists(settings):
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env.update(parse_settings(settings, env))
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# Create workers
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for k, v in workers.iteritems():
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single_worker(app, k, v, env, ordinals[k]+1)
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ordinals[k] += 1
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def single_worker(app, kind, command, env, ordinal=1):
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"""Set up and deploy a single worker of a given kind"""
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env_path = join(ENV_ROOT, app)
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available = join(UWSGI_AVAILABLE, '%s_%s_%d.ini' % (app, kind, ordinal))
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enabled = join(UWSGI_ENABLED, '%s_%s_%d.ini' % (app, kind, ordinal))
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settings = [
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('virtualenv', join(ENV_ROOT, app)),
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('chdir', join(APP_ROOT, app)),
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('master', 'true'),
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('project', app),
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('max-requests', '1000'),
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('processes', '1'),
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('procname-prefix', '%s_%s_%d:' % (app, kind, ordinal)),
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('enable-threads', 'true'),
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('threads', '4'),
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('log-maxsize', '1048576'),
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('logto', '%s_%d.log' % (join(LOG_ROOT, app, kind), ordinal)),
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('log-backupname', '%s_%d.log.old' % (join(LOG_ROOT, app, kind), ordinal)),
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]
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for k, v in env.iteritems():
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settings.append(('env', '%s=%s' % (k,v)))
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if kind == 'wsgi':
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echo("-----> Setting HTTP port to %s" % env['PORT'], fg='yellow')
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settings.extend([
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('module', command),
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('http', ':%s' % env['PORT'])
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])
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else:
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settings.append(('attach-daemon', command))
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with open(available, 'w') as h:
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h.write('[uwsgi]\n')
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for k, v in settings:
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h.write("%s = %s\n" % (k, v))
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echo("-----> Enabling '%s:%s_%d'" % (app, kind, ordinal), fg='green')
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if exists(enabled):
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os.unlink(enabled)
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sleep(5) # TODO: replace this with zmq signalling
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shutil.copyfile(available, enabled)
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def multi_tail(app, filenames):
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"""Tails multiple log files"""
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def peek(handle):
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where = handle.tell()
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line = handle.readline()
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if not line:
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handle.seek(where)
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return None
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return line
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inodes = {}
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files = {}
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prefixes = {}
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for f in filenames:
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prefixes[f] = splitext(basename(f))[0]
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files[f] = open(f)
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inodes[f] = os.stat(f).st_ino
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files[f].seek(0, 2)
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longest = max(map(len, prefixes.values()))
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for f in filenames:
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for line in deque(open(f), 20):
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yield "%s | %s" % (prefixes[f].ljust(longest), line)
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while True:
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updated = False
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for f in filenames:
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line = peek(files[f])
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if not line:
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continue
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else:
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updated = True
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yield "%s | %s" % (prefixes[f].ljust(longest), line)
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if not updated:
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sleep(1)
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for f in filenames:
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if exists(f):
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if os.stat(f).st_ino != inodes[f]:
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files[f] = open(f)
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inodes[f] = os.stat(f).st_ino
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else:
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filenames.remove(f)
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# === CLI commands ===
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@group()
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def piku():
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"""Initialize paths"""
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for p in [APP_ROOT, GIT_ROOT, ENV_ROOT, UWSGI_ROOT, UWSGI_AVAILABLE, UWSGI_ENABLED, LOG_ROOT]:
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if not exists(p):
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os.makedirs(p)
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@piku.resultcallback()
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def cleanup(ctx):
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"""Callback from command execution -- currently used for debugging"""
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pass
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#print sys.argv[1:]
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#print os.environ
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# --- User commands ---
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@piku.command("deploy")
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@argument('app')
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def deploy_app(app):
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"""Deploy an application"""
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app = sanitize_app_name(app)
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do_deploy(app)
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@piku.command("destroy")
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@argument('app')
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def destroy_app(app):
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"""Destroy an application"""
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app = sanitize_app_name(app)
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for p in [join(x, app) for x in [APP_ROOT, GIT_ROOT, ENV_ROOT, LOG_ROOT]]:
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if exists(p):
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echo("Removing folder '%s'" % p, fg='yellow')
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shutil.rmtree(p)
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for p in [join(x, '%s*.ini' % app) for x in [UWSGI_AVAILABLE, UWSGI_ENABLED]]:
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g = glob(p)
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if len(g):
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for f in g:
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echo("Removing file '%s'" % f, fg='yellow')
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os.remove(f)
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@piku.command("disable")
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@argument('app')
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def disable_app(app):
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"""Disable an application"""
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app = sanitize_app_name(app)
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config = glob(join(UWSGI_ENABLED, '%s*.ini' % app))
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if len(config):
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echo("Disabling app '%s'..." % app, fg='yellow')
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for c in config:
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os.remove(c)
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else:
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echo("Error: app '%s' not deployed!" % app, fg='red')
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@piku.command("enable")
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@argument('app')
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def enable_app(app):
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"""Enable an application"""
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app = sanitize_app_name(app)
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enabled = glob(join(UWSGI_ENABLED, '%s*.ini' % app))
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available = glob(join(UWSGI_AVAILABLE, '%s*.ini' % app))
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if exists(join(APP_ROOT, app)):
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if len(enabled):
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if len(available):
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echo("Enabling app '%s'..." % app, fg='yellow')
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for a in available:
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shutil.copy(a, join(UWSGI_ENABLED, app))
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else:
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echo("Error: app '%s' is not configured.", fg='red')
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else:
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echo("Warning: app '%s' is already enabled, skipping.", fg='yellow')
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else:
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echo("Error: app '%s' does not exist.", fg='red')
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@piku.command("ls")
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def list_apps():
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"""List applications"""
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for a in os.listdir(APP_ROOT):
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echo(a, fg='green')
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# TODO: multitail
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@piku.command("tail")
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@argument('app')
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def tail_logs(app):
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"""Tail an application log"""
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app = sanitize_app_name(app)
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logfiles = glob(join(LOG_ROOT, app, '*.log'))
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if len(logfiles):
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for line in multi_tail(app, logfiles):
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echo(line.strip(), fg='white')
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else:
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echo("No logs found for app '%s'." % app, fg='yellow')
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@piku.command("restart")
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@argument('app')
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def restart_app(app):
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"""Restart an application"""
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app = sanitize_app_name(app)
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enabled = glob(join(UWSGI_ENABLED, '%s*.ini' % app))
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available = glob(join(UWSGI_AVAILABLE, '%s*.ini' % app))
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if len(enabled):
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echo("Restarting app '%s'..." % app, fg='yellow')
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# Destroying the original file signals uWSGI to kill the vassal instead of reloading it
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for e in enabled:
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os.unlink(e)
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sleep(5) # TODO: replace this with zmq signalling
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if len(available):
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for a in available:
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shutil.copy(a, join(UWSGI_ENABLED, app))
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else:
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echo("Error: app '%s' not enabled!" % app, fg='red')
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# --- Internal commands ---
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@piku.command("git-hook")
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@argument('app')
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def git_hook(app):
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"""INTERNAL: Post-receive git hook"""
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app = sanitize_app_name(app)
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repo_path = join(GIT_ROOT, app)
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app_path = join(APP_ROOT, app)
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for line in sys.stdin:
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oldrev, newrev, refname = line.strip().split(" ")
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#print "refs:", oldrev, newrev, refname
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if refname == "refs/heads/master":
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# Handle pushes to master branch
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if not exists(app_path):
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echo("-----> Creating app '%s'" % app, fg='green')
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os.makedirs(app_path)
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call('git clone --quiet %s %s' % (repo_path, app), cwd=APP_ROOT, shell=True)
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do_deploy(app)
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else:
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# TODO: Handle pushes to another branch
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echo("receive-branch '%s': %s, %s" % (app, newrev, refname))
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@piku.command("git-receive-pack")
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@argument('app')
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def receive(app):
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"""INTERNAL: Handle git pushes for an app"""
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app = sanitize_app_name(app)
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hook_path = join(GIT_ROOT, app, 'hooks', 'post-receive')
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if not exists(hook_path):
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os.makedirs(dirname(hook_path))
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# Initialize the repository with a hook to this script
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call("git init --quiet --bare " + app, cwd=GIT_ROOT, shell=True)
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with open(hook_path,'w') as h:
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h.write("""#!/usr/bin/env bash
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set -e; set -o pipefail;
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cat | PIKU_ROOT="%s" $HOME/piku.py git-hook %s""" % (PIKU_ROOT, app)) # TODO: remove hardcoded script name
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# Make the hook executable by our user
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os.chmod(hook_path, os.stat(hook_path).st_mode | stat.S_IXUSR)
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# Handle the actual receive. We'll be called with 'git-hook' after it happens
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call('git-shell -c "%s"' % " ".join(sys.argv[1:]), cwd=GIT_ROOT, shell=True)
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if __name__ == '__main__':
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piku() |