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import json
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import logging
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import os
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import subprocess
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import sys
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import tempfile
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from typing import Callable, Dict, List, Optional, Sequence, Tuple, Type, TypeVar, Union
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from python_terraform.tfstate import Tfstate
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logger = logging.getLogger(__name__)
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COMMAND_WITH_SUBCOMMANDS = {"workspace"}
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class TerraformFlag:
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pass
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class IsFlagged(TerraformFlag):
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pass
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class IsNotFlagged(TerraformFlag):
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pass
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CommandOutput = Tuple[Optional[int], Optional[str], Optional[str]]
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class TerraformCommandError(subprocess.CalledProcessError):
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def __init__(self, ret_code: int, cmd: str, out: Optional[str], err: Optional[str]):
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super(TerraformCommandError, self).__init__(ret_code, cmd)
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self.out = out
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self.err = err
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class Terraform:
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"""Wrapper of terraform command line tool.
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https://www.terraform.io/
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"""
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def __init__(
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self,
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working_dir: Optional[str] = None,
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targets: Optional[Sequence[str]] = None,
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state: Optional[str] = None,
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variables: Optional[Sequence[str]] = None,
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parallelism: Optional[str] = None,
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var_file: Optional[str] = None,
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terraform_bin_path: Optional[str] = None,
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is_env_vars_included: bool = True,
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):
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"""
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:param working_dir: the folder of the working folder, if not given,
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will be current working folder
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:param targets: list of target
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as default value of apply/destroy/plan command
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:param state: path of state file relative to working folder,
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as a default value of apply/destroy/plan command
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:param variables: default variables for apply/destroy/plan command,
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will be override by variable passing by apply/destroy/plan method
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:param parallelism: default parallelism value for apply/destroy command
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:param var_file: passed as value of -var-file option,
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could be string or list, list stands for multiple -var-file option
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:param terraform_bin_path: binary path of terraform
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:type is_env_vars_included: bool
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:param is_env_vars_included: included env variables when calling terraform cmd
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"""
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self.is_env_vars_included = is_env_vars_included
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self.working_dir = working_dir
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self.state = state
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self.targets = [] if targets is None else targets
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self.variables = dict() if variables is None else variables
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self.parallelism = parallelism
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self.terraform_bin_path = (
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terraform_bin_path if terraform_bin_path else "terraform"
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)
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self.var_file = var_file
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self.temp_var_files = VariableFiles()
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# store the tfstate data
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self.tfstate = None
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self.read_state_file(self.state)
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def __getattr__(self, item: str) -> Callable:
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def wrapper(*args, **kwargs):
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cmd_name = str(item)
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if cmd_name.endswith("_cmd"):
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cmd_name = cmd_name[:-4]
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logger.debug("called with %r and %r", args, kwargs)
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return self.cmd(cmd_name, *args, **kwargs)
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return wrapper
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def apply(
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self,
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dir_or_plan: Optional[str] = None,
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input: bool = False,
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skip_plan: bool = True,
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no_color: Type[TerraformFlag] = IsFlagged,
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**kwargs,
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) -> CommandOutput:
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"""Refer to https://terraform.io/docs/commands/apply.html
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no-color is flagged by default
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:param no_color: disable color of stdout
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:param input: disable prompt for a missing variable
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:param dir_or_plan: folder relative to working folder
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:param skip_plan: force apply without plan (default: false)
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:param kwargs: same as kwags in method 'cmd'
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:returns return_code, stdout, stderr
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"""
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if not skip_plan:
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return self.plan(dir_or_plan=dir_or_plan, **kwargs)
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default = kwargs
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default["input"] = input
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default["no_color"] = no_color
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default["auto-approve"] = True
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option_dict = self._generate_default_options(default)
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args = self._generate_default_args(dir_or_plan)
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return self.cmd("apply", *args, **option_dict)
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def _generate_default_args(self, dir_or_plan) -> Sequence[str]:
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return [dir_or_plan] if dir_or_plan else []
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def _generate_default_options(self, input_options):
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option_dict = dict()
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option_dict["state"] = self.state
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option_dict["target"] = self.targets
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option_dict["var"] = self.variables
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option_dict["var_file"] = self.var_file
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option_dict["parallelism"] = self.parallelism
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option_dict["no_color"] = IsFlagged
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option_dict["input"] = False
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option_dict.update(input_options)
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return option_dict
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def destroy(
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self,
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dir_or_plan: Optional[str] = None,
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force: Type[TerraformFlag] = IsFlagged,
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**kwargs,
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) -> CommandOutput:
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"""Refer to https://www.terraform.io/docs/commands/destroy.html
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force/no-color option is flagged by default
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:return: ret_code, stdout, stderr
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"""
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default = kwargs
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default["force"] = force
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options = self._generate_default_options(default)
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args = self._generate_default_args(dir_or_plan)
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return self.cmd("destroy", *args, **options)
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def plan(
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self,
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dir_or_plan: Optional[str] = None,
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detailed_exitcode: Type[TerraformFlag] = IsFlagged,
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**kwargs,
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) -> CommandOutput:
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"""Refer to https://www.terraform.io/docs/commands/plan.html
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:param detailed_exitcode: Return a detailed exit code when the command exits.
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:param dir_or_plan: relative path to plan/folder
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:param kwargs: options
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:return: ret_code, stdout, stderr
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"""
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options = kwargs
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options["detailed_exitcode"] = detailed_exitcode
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options = self._generate_default_options(options)
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args = self._generate_default_args(dir_or_plan)
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return self.cmd("plan", *args, **options)
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def init(
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self,
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dir_or_plan: Optional[str] = None,
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backend_config: Optional[Dict[str, str]] = None,
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reconfigure: Type[TerraformFlag] = IsFlagged,
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backend: bool = True,
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**kwargs,
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) -> CommandOutput:
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"""Refer to https://www.terraform.io/docs/commands/init.html
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By default, this assumes you want to use backend config, and tries to
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init fresh. The flags -reconfigure and -backend=true are default.
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:param dir_or_plan: relative path to the folder want to init
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:param backend_config: a dictionary of backend config options. eg.
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t = Terraform()
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t.init(backend_config={'access_key': 'myaccesskey',
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'secret_key': 'mysecretkey', 'bucket': 'mybucketname'})
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:param reconfigure: whether or not to force reconfiguration of backend
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:param backend: whether or not to use backend settings for init
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:param kwargs: options
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:return: ret_code, stdout, stderr
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"""
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options = kwargs
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options["backend_config"] = backend_config
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options["reconfigure"] = reconfigure
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options["backend"] = backend
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options = self._generate_default_options(options)
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args = self._generate_default_args(dir_or_plan)
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return self.cmd("init", *args, **options)
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def generate_cmd_string(self, cmd: str, *args, **kwargs) -> List[str]:
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"""For any generate_cmd_string doesn't written as public method of Terraform
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examples:
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1. call import command,
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ref to https://www.terraform.io/docs/commands/import.html
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--> generate_cmd_string call:
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terraform import -input=true aws_instance.foo i-abcd1234
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--> python call:
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tf.generate_cmd_string('import', 'aws_instance.foo', 'i-abcd1234', input=True)
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2. call apply command,
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--> generate_cmd_string call:
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terraform apply -var='a=b' -var='c=d' -no-color the_folder
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--> python call:
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tf.generate_cmd_string('apply', the_folder, no_color=IsFlagged, var={'a':'b', 'c':'d'})
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:param cmd: command and sub-command of terraform, seperated with space
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refer to https://www.terraform.io/docs/commands/index.html
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:param args: arguments of a command
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:param kwargs: same as kwags in method 'cmd'
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:return: string of valid terraform command
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"""
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cmds = cmd.split()
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cmds = [self.terraform_bin_path] + cmds
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if cmd in COMMAND_WITH_SUBCOMMANDS:
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args = list(args)
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subcommand = args.pop(0)
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cmds.append(subcommand)
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for option, value in kwargs.items():
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if "_" in option:
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option = option.replace("_", "-")
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if isinstance(value, list):
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for sub_v in value:
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cmds += [f"-{option}={sub_v}"]
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continue
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if isinstance(value, dict):
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if "backend-config" in option:
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for bk, bv in value.items():
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cmds += [f"-backend-config={bk}={bv}"]
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continue
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# since map type sent in string won't work, create temp var file for
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# variables, and clean it up later
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elif option == "var":
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# We do not create empty var-files if there is no var passed.
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# An empty var-file would result in an error: An argument or block definition is required here
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if value:
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filename = self.temp_var_files.create(value)
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cmds += [f"-var-file={filename}"]
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continue
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# simple flag,
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if value is IsFlagged:
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cmds += [f"-{option}"]
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continue
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if value is None or value is IsNotFlagged:
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continue
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if isinstance(value, bool):
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value = "true" if value else "false"
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cmds += [f"-{option}={value}"]
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cmds += args
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return cmds
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def cmd(
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self,
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cmd: str,
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*args,
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capture_output: Union[bool, str] = True,
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raise_on_error: bool = False,
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synchronous: bool = True,
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**kwargs,
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) -> CommandOutput:
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"""Run a terraform command, if success, will try to read state file
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:param cmd: command and sub-command of terraform, seperated with space
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refer to https://www.terraform.io/docs/commands/index.html
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:param args: arguments of a command
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:param kwargs: any option flag with key value without prefixed dash character
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if there's a dash in the option name, use under line instead of dash,
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ex. -no-color --> no_color
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if it's a simple flag with no value, value should be IsFlagged
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ex. cmd('taint', allow＿missing=IsFlagged)
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if it's a boolean value flag, assign True or false
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if it's a flag could be used multiple times, assign list to it's value
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if it's a "var" variable flag, assign dictionary to it
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if a value is None, will skip this option
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if the option 'capture_output' is passed (with any value other than
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True), terraform output will be printed to stdout/stderr and
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"None" will be returned as out and err.
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if the option 'raise_on_error' is passed (with any value that evaluates to True),
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and the terraform command returns a nonzerop return code, then
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a TerraformCommandError exception will be raised. The exception object will
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have the following properties:
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returncode: The command's return code
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out: The captured stdout, or None if not captured
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err: The captured stderr, or None if not captured
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:return: ret_code, out, err
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"""
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if capture_output is True:
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stderr = subprocess.PIPE
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stdout = subprocess.PIPE
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elif capture_output == "framework":
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stderr = None
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stdout = None
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else:
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stderr = sys.stderr
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stdout = sys.stdout
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cmds = self.generate_cmd_string(cmd, *args, **kwargs)
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logger.debug("Command: %s", " ".join(cmds))
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working_folder = self.working_dir if self.working_dir else None
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environ_vars = {}
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if self.is_env_vars_included:
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environ_vars = os.environ.copy()
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p = subprocess.Popen(
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cmds, stdout=stdout, stderr=stderr, cwd=working_folder, env=environ_vars
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)
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if not synchronous:
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return None, None, None
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out, err = p.communicate()
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ret_code = p.returncode
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logger.debug("output: %s", out)
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if ret_code == 0:
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self.read_state_file()
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else:
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logger.warning("error: %s", err)
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self.temp_var_files.clean_up()
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if capture_output is True:
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out = out.decode()
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err = err.decode()
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else:
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out = None
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err = None
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if ret_code and raise_on_error:
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raise TerraformCommandError(ret_code, " ".join(cmds), out=out, err=err)
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return ret_code, out, err
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|
|
def output(
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self, *args, capture_output: bool = True, **kwargs
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) -> Union[None, str, Dict[str, str], Dict[str, Dict[str, str]]]:
|
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"""Refer https://www.terraform.io/docs/commands/output.html
|
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|
Note that this method does not conform to the (ret_code, out, err) return
|
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|
convention. To use the "output" command with the standard convention,
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|
call "output_cmd" instead of "output".
|
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|
|
:param args: Positional arguments. There is one optional positional
|
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|
|
argument NAME; if supplied, the returned output text
|
|
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|
|
will be the json for a single named output value.
|
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|
|
|
:param kwargs: Named options, passed to the command. In addition,
|
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|
|
'full_value': If True, and NAME is provided, then
|
|
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|
|
the return value will be a dict with
|
|
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|
|
"value', 'type', and 'sensitive'
|
|
|
|
|
properties.
|
|
|
|
|
:return: None, if an error occured
|
|
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|
|
Output value as a string, if NAME is provided and full_value
|
|
|
|
|
is False or not provided
|
|
|
|
|
Output value as a dict with 'value', 'sensitive', and 'type' if
|
|
|
|
|
NAME is provided and full_value is True.
|
|
|
|
|
dict of named dicts each with 'value', 'sensitive', and 'type',
|
|
|
|
|
if NAME is not provided
|
|
|
|
|
"""
|
|
|
|
|
kwargs["json"] = IsFlagged
|
|
|
|
|
if capture_output is False:
|
|
|
|
|
raise ValueError("capture_output is required for this method")
|
|
|
|
|
|
|
|
|
|
ret, out, _ = self.output_cmd(*args, **kwargs)
|
|
|
|
|
|
|
|
|
|
if ret:
|
|
|
|
|
return None
|
|
|
|
|
|
|
|
|
|
return json.loads(out.lstrip())
|
|
|
|
|
|
|
|
|
|
def read_state_file(self, file_path=None) -> None:
|
|
|
|
|
"""Read .tfstate file
|
|
|
|
|
|
|
|
|
|
:param file_path: relative path to working dir
|
|
|
|
|
:return: states file in dict type
|
|
|
|
|
"""
|
|
|
|
|
|
|
|
|
|
working_dir = self.working_dir or ""
|
|
|
|
|
|
|
|
|
|
file_path = file_path or self.state or ""
|
|
|
|
|
|
|
|
|
|
if not file_path:
|
|
|
|
|
backend_path = os.path.join(file_path, ".terraform", "terraform.tfstate")
|
|
|
|
|
|
|
|
|
|
if os.path.exists(os.path.join(working_dir, backend_path)):
|
|
|
|
|
file_path = backend_path
|
|
|
|
|
else:
|
|
|
|
|
file_path = os.path.join(file_path, "terraform.tfstate")
|
|
|
|
|
|
|
|
|
|
file_path = os.path.join(working_dir, file_path)
|
|
|
|
|
|
|
|
|
|
self.tfstate = Tfstate.load_file(file_path)
|
|
|
|
|
|
|
|
|
|
def set_workspace(self, workspace, *args, **kwargs) -> CommandOutput:
|
|
|
|
|
"""Set workspace
|
|
|
|
|
|
|
|
|
|
:param workspace: the desired workspace.
|
|
|
|
|
:return: status
|
|
|
|
|
"""
|
|
|
|
|
return self.cmd("workspace", "select", workspace, *args, **kwargs)
|
|
|
|
|
|
|
|
|
|
def create_workspace(self, workspace, *args, **kwargs) -> CommandOutput:
|
|
|
|
|
"""Create workspace
|
|
|
|
|
|
|
|
|
|
:param workspace: the desired workspace.
|
|
|
|
|
:return: status
|
|
|
|
|
"""
|
|
|
|
|
return self.cmd("workspace", "new", workspace, *args, **kwargs)
|
|
|
|
|
|
|
|
|
|
def delete_workspace(self, workspace, *args, **kwargs) -> CommandOutput:
|
|
|
|
|
"""Delete workspace
|
|
|
|
|
|
|
|
|
|
:param workspace: the desired workspace.
|
|
|
|
|
:return: status
|
|
|
|
|
"""
|
|
|
|
|
return self.cmd("workspace", "delete", workspace, *args, **kwargs)
|
|
|
|
|
|
|
|
|
|
def show_workspace(self, **kwargs) -> CommandOutput:
|
|
|
|
|
"""Show workspace, this command does not need the [DIR] part
|
|
|
|
|
|
|
|
|
|
:return: workspace
|
|
|
|
|
"""
|
|
|
|
|
return self.cmd("workspace", "show", **kwargs)
|
|
|
|
|
|
|
|
|
|
def __exit__(self, exc_type, exc_value, traceback) -> None:
|
|
|
|
|
self.temp_var_files.clean_up()
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
class VariableFiles:
|
|
|
|
|
def __init__(self):
|
|
|
|
|
self.files = []
|
|
|
|
|
|
|
|
|
|
def create(self, variables: Dict[str, str]) -> str:
|
|
|
|
|
with tempfile.NamedTemporaryFile(
|
|
|
|
|
"w+t", suffix=".tfvars.json", delete=False
|
|
|
|
|
) as temp:
|
|
|
|
|
logger.debug("%s is created", temp.name)
|
|
|
|
|
self.files.append(temp)
|
|
|
|
|
logger.debug("variables wrote to tempfile: %s", variables)
|
|
|
|
|
temp.write(json.dumps(variables))
|
|
|
|
|
file_name = temp.name
|
|
|
|
|
|
|
|
|
|
return file_name
|
|
|
|
|
|
|
|
|
|
def clean_up(self):
|
|
|
|
|
for f in self.files:
|
|
|
|
|
os.unlink(f.name)
|
|
|
|
|
|
|
|
|
|
self.files = []
|
Francois Lebreau
3 years ago