258 lines
7.7 KiB
Python
Executable File
258 lines
7.7 KiB
Python
Executable File
#!/usr/bin/env python3
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from __future__ import annotations
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import argparse
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import dataclasses
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import sys
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from os import path
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from pathlib import Path
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import os
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import time
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from typing import Any, Callable, DefaultDict, Iterable, Mapping
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from jinja2 import Template
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import itertools
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import subprocess as sub
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import shutil
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import string
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import secrets
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from dataclasses import dataclass
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TEMPLATE_DIR = "./templates"
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@dataclass
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class MachineResources:
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cpus: int
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mem: int
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@staticmethod
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def from_prompt() -> "MachineResources":
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cpus = input("How many processors would you like to assign (default=1): ")
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if not cpus:
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cpus = "1"
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if not cpus.isdigit() or int(cpus) < 0:
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raise Exception("Expected a postive amount of processors")
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mem = input(
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"How many megabytes of RAM would you like to assign (default=1024): "
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)
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if not mem:
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mem = "1024"
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if not mem.isdigit() or int(mem) < 0:
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raise Exception("Expected a postive amount of memory")
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return MachineResources(cpus=int(cpus), mem=int(mem))
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def gen_pass() -> str:
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alphabet = string.ascii_letters + string.digits
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password = "".join(secrets.choice(alphabet) for _ in range(20))
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return password
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def check_positive(value: str):
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ivalue = int(value)
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if ivalue <= 0:
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raise Exception("Supplied number must be >= 0")
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return ivalue
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def encode_member(member: str, mapping: Mapping[str, Any]) -> str:
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return member + " " + " ".join([f"{k}={v}" for k, v in mapping.items()])
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def iter_ips(ip_format: str, start_octet: int):
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ip_int = start_octet
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ip_fmt = ip_format
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while ip_int < 255:
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yield ip_fmt.format(ip_int)
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ip_int += 1
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class InventoryWriter:
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def __init__(self, location: str) -> None:
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self._file_handle = Path(location)
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self._groups: dict[str, set[str]] = DefaultDict(set)
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def add(self, name: str, members: Iterable[str]):
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self._groups[name] |= set(members)
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def _build_group(self, name: str, members: set[str]):
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fmt = f"[{name}]\n" + "\n".join(members)
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return fmt
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def flush(self):
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txt = ""
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for name, members in self._groups.items():
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txt += self._build_group(name, members) + "\n\n"
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self._file_handle.write_text(txt, encoding="utf8")
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def copy_template(src: str, dest: str, mapping: Mapping[str, Any] = {}):
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c = Path(src).read_text()
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t: Template = Template(c)
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r = t.render(mapping)
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Path(dest).write_text(r)
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def list_envs(args: argparse.Namespace):
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try:
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customer_path = path.join("customers", args.customer_name, "envs")
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print(" ".join(os.listdir(customer_path)))
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except FileNotFoundError:
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raise Exception(f"Customer `{args.customer_name}` does not exist.")
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def delete_env(args: argparse.Namespace):
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for env in args.env_names:
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env_path = path.join("customers", args.customer_name, "envs", env)
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sub.call(["vagrant", "destroy", "-f"], cwd=env_path)
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shutil.rmtree(env_path)
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print(f"Deleted `{env}` from customer `{ args.customer_name}`")
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def create_env(args: argparse.Namespace):
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if (args.num_nginx_web + args.num_nginx_lb + args.num_postgres) == 0:
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raise Exception("At least one item should be deployed")
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env_path = path.join("customers", args.customer_name, "envs", args.env_name)
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Path(env_path).mkdir(exist_ok=True, parents=True)
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web_specs = None
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if args.num_nginx_web > 0:
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print("\nNginx webserver resources:")
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web_specs = MachineResources.from_prompt()
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lb_specs = None
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if args.num_nginx_lb > 0:
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print("\nNginx loadbalancer resources: ")
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lb_specs = MachineResources.from_prompt()
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psql_specs = None
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if args.num_postgres > 0:
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print("\nPostgresql machine resources: ")
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psql_specs = MachineResources.from_prompt()
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# Template `ansible.cfg`
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src = path.join(TEMPLATE_DIR, "ansible.cfg.template")
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dest = path.join(env_path, "ansible.cfg")
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copy_template(src=src, dest=dest)
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# Create inventory file
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inv_path = path.join(env_path, "inventory")
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iw = InventoryWriter(inv_path)
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ip_generator = iter_ips(args.ip_format, args.ip_int)
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web_ips = itertools.islice(ip_generator, args.num_nginx_web)
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iw.add("webserver", web_ips)
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lb_ips = itertools.islice(ip_generator, args.num_nginx_lb)
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iw.add("loadbalancer", lb_ips)
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psql_gen_pass: Callable[[str], str] = lambda x: encode_member(
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x, {"psql_pass": gen_pass()}
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)
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psql_ips = list(itertools.islice(ip_generator, args.num_postgres))
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psql_ips = map(psql_gen_pass, psql_ips)
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iw.add("postgresql", psql_ips)
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iw.flush()
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# Template `Vagrantfile`
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src = path.join(TEMPLATE_DIR, "Vagrantfile.template")
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dest = path.join(env_path, "Vagrantfile")
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mapping = {
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"env": args.env_name,
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"customer_name": args.customer_name,
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"ip_int": args.ip_int,
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"ip_format": args.ip_format.replace("{}", "%d"),
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"num_webserver": args.num_nginx_web,
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"num_loadbalancers": args.num_nginx_lb,
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"num_postgres": args.num_postgres,
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"webserver_specs": dataclasses.asdict(web_specs),
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"loadbalancers_specs": dataclasses.asdict(lb_specs),
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"postgres_specs": dataclasses.asdict(psql_specs),
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}
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copy_template(src=src, dest=dest, mapping=mapping)
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# Generate .ssh
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ssh_dir = path.join(env_path, ".ssh")
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Path(ssh_dir).mkdir(exist_ok=True)
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rsa_path = path.join(ssh_dir, "id_rsa")
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if not Path(rsa_path).exists():
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print(end="\n")
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ssh_key_cmd = [
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"ssh-keygen",
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"-t",
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"rsa",
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"-b",
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"2048",
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"-f",
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rsa_path,
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]
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sub.call(ssh_key_cmd)
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# Provision and configure machines
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sub.call(["vagrant", "up"], cwd=env_path)
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print("Waiting on virtual machines...")
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time.sleep(5)
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sub.call(["ansible-playbook", "../../../../site.yml"], cwd=env_path)
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def main() -> int:
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parser = argparse.ArgumentParser()
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sub_parser = parser.add_subparsers()
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list_parser = sub_parser.add_parser("list", help="list customer-owned environments")
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list_parser.add_argument("customer_name", type=str, help="name of the customer")
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list_parser.set_defaults(func=list_envs)
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cenv_parser = sub_parser.add_parser("create", help="create a new environment")
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cenv_parser.add_argument("customer_name", type=str, help="name of the customer")
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cenv_parser.add_argument("env_name", type=str, help="name of the environment")
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cenv_parser.add_argument(
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"--num-postgres",
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type=check_positive,
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help="number of postgres databases",
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default=0,
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)
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cenv_parser.add_argument(
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"--num-nginx-web",
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type=check_positive,
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help="number of nginx webservers",
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default=0,
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)
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cenv_parser.add_argument(
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"--num-nginx-lb",
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type=check_positive,
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help="number of nginx loadbalancers",
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default=0,
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)
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cenv_parser.add_argument(
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"--ip-format", type=str, help="format of ip", default="192.168.56.{}"
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)
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cenv_parser.add_argument(
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"--ip-int", type=check_positive, help="4th octet to start at", default=10
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)
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cenv_parser.set_defaults(func=create_env)
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denv_parser = sub_parser.add_parser("delete", help="delete an environment")
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denv_parser.add_argument("customer_name", type=str, help="name of the customer")
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denv_parser.add_argument(
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"env_names", type=str, nargs="+", help="name of one or more environments"
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)
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denv_parser.set_defaults(func=delete_env)
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args = parser.parse_args(sys.argv[1:])
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args.func(args)
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return 0
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if __name__ == "__main__":
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raise SystemExit(main())
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