567 lines
15 KiB
Python
567 lines
15 KiB
Python
import os
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import sys
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import errno
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import logging
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import fabric.contrib.files
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from contextlib import contextmanager as _contextmanager
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from fabric.api import env, prefix, local
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from fabric.operations import run, sudo
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def printvar(name, value, exit=False):
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"""
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debug helper method to print a variable from within a process
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:parameter name: name of the variable we are printing out
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:type name: string
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:parameter value: the value of the variable we want to print
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:type value: string
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:parameter exit: determines whether or not we exit the program at
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this point. defaults to false
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:type exit: boolean
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"""
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print("%s : %s" % (name, value))
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if exit:
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sys.exit()
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def printerr(message="", errcode=-2, exit=True):
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"""
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debug helper method thats prints error message and error code then exits
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:parameter message: the error message we want to print out.
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defaults to empty string.
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:type message: string
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:parameter errcode: the code of the error
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:type errcode: integer
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:parameter exit: determines whether or not we exit the program at
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this point. defaults to True
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:type exit: boolean
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"""
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message = "Error\n\t{message}\n\tExiting with code: {errcode}\n".format(
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message=message, errcode=errcode)
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print
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print(message)
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print
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sys.exit(errcode)
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def loggify(module, func, prefix=""):
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"""
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I'm tired of rewriting this logging code in every single function, so I
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decided to just dump it here, and return a logger that can be used and
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thrown away when it's done
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:parameter module: name of the module being used, ie 'nginx', 'deploy', etc
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:type module: string
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:parameter func: the name of the function this logger is going to be used
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in
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:type func: string
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:parameter prefix: anything you want to add to the front of the logger,
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ie \'\\n\'. defaults to an empty string.
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:type prefix: string
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:rtype: logging object
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"""
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loggername = '{module}.{func}'.format(
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module=module, func=func)
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str_logging = '{prefix}%(levelname)s: {loggername} %(message)s'.format(
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prefix=prefix,
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loggername=loggername)
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logging.basicConfig(
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format=str_logging,
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level=logging.DEBUG)
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return logging.getLogger(loggername)
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def print_console(string, prepend="\n\n", append="\n\n", sep="-", numsep=44):
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"""
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helper function to take a string, and format it so it prints to the console
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in a way that is pleasing to the eye.
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:parameter string: the string to be printed
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:type string: string
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:parameter prepend: defaults to two line spaces, can be anything
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:type string: string
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:parameter append: defaults to two lines spaces after the string is printed
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:type append: string
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:parameter sep: the character used to print out one line above the string
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and one line after
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:type sep: character
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:parameter numsep: number of times the separator is printed out on a line
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:type numsep: integer
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"""
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print(prepend)
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if sep:
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print(sep * numsep)
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print(string)
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if sep:
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print(sep * numsep)
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print(append)
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def print_debug(debugstr, module, function):
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"""
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debug helper method to print out a debug string, the name of the module,
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and the function it is located in.
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The message will be printed out in the form <debugstr>:<module>:<function>
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:parameter debugstr: the debugging message we want to print
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:type debugstr: string
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:parameter module: the name of the module we are in
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:type module: string
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:parameter function: the name of the function we are in
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:type function:
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"""
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print("%s:%s:%s" % (module, function, debugstr))
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def executize(config_execute='local'):
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"""
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creates an executor to run commands. returns one of the following methods
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fabric.api.local, fabric.operations.run or fabric.operations.sudo
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:parameter config_execute: values can be either 'sudo', 'run', or 'local'.
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defaults to 'local'.
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:type config_execute: string
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:return: the fabric command corresponding to the string value
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in config_execute, either a sudo, a run or a local executor
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"""
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if config_execute == 'sudo':
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_execute = sudo
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elif config_execute == 'run':
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_execute = run
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elif config_execute == 'local':
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_execute = local
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else:
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errmsg = "did not enter a correct value of 'sudo', 'run' or" \
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" 'local' to executize.\nExiting."
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printerr(message=errmsg, errcode=-2)
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return _execute
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def booleanize(value):
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"""
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take the argument and return it as either True or False
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if the argument is neither, throw a TypeError explaining that the value
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given cannot be booleanized
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:parameter value: takes values of y, n, yes, no, true, false,
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1 or 0
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:type value: string
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:return: converts value to True or False. Note 1 is
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considered True and 0 is False
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:rtype: boolean
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"""
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true_values = ("y", "yes", "true", "1")
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false_values = ("n", "no", "false", "0")
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if isinstance(value, bool):
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return value
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if value.lower() in true_values:
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return True
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elif value.lower() in false_values:
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return False
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raise TypeError("Cannot booleanize ambiguous value '%s'" % value)
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def ensure_dir(dirpath):
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"""
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Create a directory if it does not exists.
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Raises an OSError if there is a problem
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:parameter dirpath: directory path
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:type dirpath: string
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"""
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try:
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if not os.path.exists(dirpath):
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print("creating directory: %s" % dirpath)
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os.makedirs(dirpath)
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except OSError as e:
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if e.errno != errno.EEXIST:
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print("Error occurred while creating directory: %s"
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% dirpath)
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raise
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def ensure_file(filepath):
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"""
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Simulates linux 'touch' command
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:parameter filepath: name of the file we want to create. Note this
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must include the full path and filename
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:type filepath: string
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"""
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if not os.path.exists(filepath):
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open(filepath, 'w').close()
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def upload_template(filename, destination, context, use_jinja,
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use_sudo, backup, template_dir, debug=False):
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"""
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helper wrapper method to upload a template
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it wraps around fabric.contrib.files.upload_template method.
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See https://docs.fabfile.org/en/1.11/api/contrib/files.html
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:parameter filename: the full path to the filename if we are not
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using jinja, otherwise using template_dir and just the filename
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this file will be interpolated using the given context and
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uploaded to the remote host
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:type filename: string
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:parameter destination: remote file path to place the file
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(includes filename)
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:type destination: string
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:parameter context: variable context
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:type context: dict
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:parameter use_jinja: whether we are using jinja template system or not.
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Templates will be loaded from the invoking users' current working
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directory or by template_dir
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:type use_jinja: boolean
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:parameter use_sudo: whether we are using sudo to place the file.
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By default the file will be copied as the logged in user
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:type use_sudo: boolean
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:parameter backup: if the destination file already exists, create a backup
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of it with the extension .bak
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:type backup: boolean
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:parameter template_dir: path to the template directory that is used if
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jinja is true. directory where the file is located
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:type template_dir: string
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:parameter debug: if true, just print out the command we are using to
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invoke the fabric upload_template method. defaults to False
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:type debug: boolean
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"""
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if env.debug:
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logging.basicConfig(
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format='\n%(levelname)s: utils.upload_template %(message)s',
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level=logging.DEBUG)
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command_msg = "\n\tupload_template(" \
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"\n\tfilename={filename}," \
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"\n\tdestination={destination_available}," \
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"\n\tcontext={context}," \
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"\n\tuse_jinja={use_jinja}," \
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"\n\tuse_sudo={use_sudo}," \
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"\n\tbackup={backup}," \
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"\n\ttemplate_dir={template_dir})\n".format(
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filename=filename,
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destination_available=destination,
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context=context,
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use_jinja=use_jinja,
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use_sudo=use_sudo,
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backup=backup,
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template_dir=template_dir)
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if debug:
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return command_msg
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else:
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fabric.contrib.files.upload_template(
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filename=filename,
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destination=destination,
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context=context,
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use_jinja=use_jinja,
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use_sudo=use_sudo,
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backup=backup,
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template_dir=template_dir)
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def get_upload_template_msg(filename, destination, context, use_jinja,
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use_sudo, backup, template_dir, debug=False):
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command_msg = "\n\tupload_template(" \
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"\n\tfilename={filename}," \
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"\n\tdestination={destination_available}," \
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"\n\tcontext={context}," \
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"\n\tuse_jinja={use_jinja}," \
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"\n\tuse_sudo={use_sudo}," \
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"\n\tbackup={backup}," \
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"\n\ttemplate_dir={template_dir})\n".format(
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filename=filename,
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destination_available=destination,
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context=context,
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use_jinja=use_jinja,
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use_sudo=use_sudo,
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backup=backup,
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template_dir=template_dir)
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return command_msg
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@_contextmanager
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def virtualenv_source():
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with prefix("source virtualenvwrapper.sh"):
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yield
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@_contextmanager
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def virtualenv():
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configuration = env.config
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with virtualenv_source():
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with prefix("workon %s" % configuration.virtualenv.name):
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yield
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# with prefix("/bin/bash -c -l 'source %s'" %
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# configuration.virtualenv.activate):
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# yield
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# with prefix("/bin/bash -c -l 'source /usr/local/bin/' \
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# 'virtualenvwrapper.sh ' \
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# '&& workon %s'" % configuration.virtualenv.name):
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# yield
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def generate_template_build_path(section, template_name='conf'):
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"""
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helper function to automate creation of build path
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:parameter section: the template section we are building off of
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:type section: string
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:parameter template_name: by default this is "conf", but can be
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different, for example, the 'database' section has 3 different
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template names
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:type template_name: string
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:return: a path to where the template should be placed
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"""
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import os
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configuration = env.config
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conf_section = getattr(configuration.templates, section)
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conf_section_templatename = getattr(conf_section, template_name)
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build_path = os.path.join(
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conf_section.path.remote,
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'build',
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conf_section_templatename.dst)
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return build_path
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def generate_template_files_path(section):
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"""
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helper function to automate creation of build path
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:parameter section: the template section we are building off of
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:type section: string
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:return: a path to where the template jinja file is located
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:rtype: string
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"""
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import os
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configuration = env.config
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conf_section = getattr(configuration.templates, section)
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files_path = os.path.join(
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conf_section.path.local,
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'files')
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return files_path
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def print_run(command, prefix="\"\n\t", suffix="\n\t\""):
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"""
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helper function to print out what a command will actually look like when
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run
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:parameter command: a typical bash command that I want to run
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:type command: string
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:parameter prefix: prefix that is added to the string, typically done
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for clarity of viewing
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:type prefix: string
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:parameter suffix: suffix that is added to the string, typically done
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for clarity of viewing
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:type suffix: string
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:returns: an example of how the command will actually look if run
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on the command line
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:rtype: string
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"""
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return "run ({prefix}{command}{suffix})".format(
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prefix=prefix,
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suffix=suffix,
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command=command)
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def handle_flag_message(param, message, values=['-h', '--help']):
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"""
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if a given parameter is in the given values
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then return the given message
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:parameter param: checks if the given parameter is in
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the values.
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:type param: string
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:parameter message: the message to print out if true
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:type message: string
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:parameter values: the values we are checking to see.
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by default this is ['-h', '--help']
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:type values: list
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:return: whether the given param is in values
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:rtype: boolean
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"""
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if isinstance(param, str):
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if param.lower() in values:
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print(message)
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return True
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return False
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def is_help(key):
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"""
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helper method to determine if the given key is a help key
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:parameter key: the key we are checking
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:type key: string
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:return: if key is in -h or --help
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:rtype: boolean
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"""
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help_keys = ['-h', '--help']
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return key in help_keys
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def link_create(path_src, path_dst, debug=False):
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"""
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takes a source and destination path, then links it
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if the destination path already exists and is a link,
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then delete it. Otherwise sys.exit
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path_src - source path
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path_dst - destination path
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returns: if debug=True then it returns a msg
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"""
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from fabric.contrib.files import is_link
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from fabric.contrib.files import exists
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from fabric.operations import run
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cmd_rm = "rm {path_dst}".format(
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path_dst=path_dst
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)
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cmd_link = "ln -sf {path_src} {path_dst}".format(
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path_src=path_src,
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path_dst=path_dst
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)
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msg_debug = ""
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if exists(path_dst):
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if is_link(path_dst):
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if debug:
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msg_debug += "link already exists at dst, removing\n" \
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"link_create:cmd_rm : %s" % cmd_rm
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else:
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run(cmd_rm)
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else:
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msg_error = "something exists at dst - '%s' " \
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"- and it's not a link\n kicking out"
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sys.exit(msg_error.format(path_dst))
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if debug:
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msg_debug += "link_create:cmd_link : %s" % cmd_link
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else:
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run(cmd_link)
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return msg_debug
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def prompt_continue(message="Do you want to continue? Y/n", default="Y",
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exit=True):
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""" prompts user if he wants to continue
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Keyword Arguments:
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message -- ask if user wants to continue
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default -- what to do if the user hits enter without giving a value
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"""
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from fabric.operations import prompt
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prompt_val = prompt(message)
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if prompt_val == "":
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prompt_val = default
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if env.debug:
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printvar(
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"prompt_val", prompt_val,
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not booleanize(prompt_val))
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return True
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else:
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if not booleanize(prompt_val):
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if exit:
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sys.exit()
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else:
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return False
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def check_debug(env):
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if hasattr(env, 'debug'):
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return env.debug
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else:
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return False
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