💊 capsul.org cloud compute service - python flask web application
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import subprocess
import re
from flask import current_app
from time import sleep
from os.path import join
from subprocess import run
from capsulflask.db import get_model
def validate_capsul_id(id):
if not re.match(r"^(cvm|capsul)-[a-z0-9]{10}$", id):
raise ValueError(f"vm id \"{id}\" must match \"^capsul-[a-z0-9]{{10}}$\"")
class VirtualMachine:
def __init__(self, id, ipv4=None, ipv6=None):
self.id = id
self.ipv4 = ipv4
self.ipv6 = ipv6
class VirtualizationInterface:
def capacity_avaliable(self, additional_ram_bytes: int) -> bool:
pass
def get(self, id: str) -> VirtualMachine:
pass
def list_ids(self) -> list:
pass
def create(self, email: str, id: str, template_image_file_name: str, vcpus: int, memory: int, ssh_public_keys: list):
pass
def destroy(self, email: str, id: str):
pass
class MockVirtualization(VirtualizationInterface):
def capacity_avaliable(self, additional_ram_bytes):
return True
def get(self, id):
validate_capsul_id(id)
return VirtualMachine(id, ipv4="1.1.1.1")
def list_ids(self) -> list:
return get_model().all_non_deleted_vm_ids()
def create(self, email: str, id: str, template_image_file_name: str, vcpus: int, memory_mb: int, ssh_public_keys: list):
validate_capsul_id(id)
current_app.logger.info(f"mock create: {id} for {email}")
sleep(1)
def destroy(self, email: str, id: str):
current_app.logger.info(f"mock destroy: {id} for {email}")
class ShellScriptVirtualization(VirtualizationInterface):
def validate_completed_process(self, completedProcess, email=None):
emailPart = ""
if email != None:
emailPart = f"for {email}"
if completedProcess.returncode != 0:
raise RuntimeError(f"""{" ".join(completedProcess.args)} failed {emailPart} with exit code {completedProcess.returncode}
stdout:
{completedProcess.stdout}
stderr:
{completedProcess.stderr}
""")
def capacity_avaliable(self, additional_ram_bytes):
my_args=[join(current_app.root_path, 'shell_scripts/capacity-avaliable.sh'), str(additional_ram_bytes)]
completedProcess = run(my_args, capture_output=True)
if completedProcess.returncode != 0:
current_app.logger.error(f"""
capacity-avaliable.sh exited {completedProcess.returncode} with
stdout:
{completedProcess.stdout}
stderr:
{completedProcess.stderr}
""")
return False
lines = completedProcess.stdout.splitlines()
output = lines[len(lines)-1]
if not output == b"yes":
current_app.logger.error(f"capacity-avaliable.sh exited 0 and returned {output} but did not return \"yes\" ")
return False
return True
def get(self, id):
validate_capsul_id(id)
completedProcess = run([join(current_app.root_path, 'shell_scripts/get.sh'), id], capture_output=True)
self.validate_completed_process(completedProcess)
lines = completedProcess.stdout.splitlines()
ipaddr = lines[0].decode("utf-8")
if not re.match(r"^([0-9]{1,3}\.){3}[0-9]{1,3}$", ipaddr):
return None
return VirtualMachine(id, ipv4=ipaddr)
def list_ids(self) -> list:
completedProcess = run([join(current_app.root_path, 'shell_scripts/list-ids.sh')], capture_output=True)
self.validate_completed_process(completedProcess)
return list(map(lambda x: x.decode("utf-8"), completedProcess.stdout.splitlines() ))
def create(self, email: str, id: str, template_image_file_name: str, vcpus: int, memory_mb: int, ssh_public_keys: list):
validate_capsul_id(id)
if not re.match(r"^[a-zA-Z0-9_.-]+$", template_image_file_name):
raise ValueError(f"template_image_file_name \"{template_image_file_name}\" must match \"^[a-zA-Z0-9_.-]+$\"")
for ssh_public_key in ssh_public_keys:
if not re.match(r"^(ssh|ecdsa)-[0-9A-Za-z+/_=@. -]+$", ssh_public_key):
raise ValueError(f"ssh_public_key \"{ssh_public_key}\" must match \"^(ssh|ecdsa)-[0-9A-Za-z+/_=@. -]+$\"")
if vcpus < 1 or vcpus > 8:
raise ValueError(f"vcpus \"{vcpus}\" must match 1 <= vcpus <= 8")
if memory_mb < 512 or memory_mb > 16384:
raise ValueError(f"memory_mb \"{memory_mb}\" must match 512 <= memory_mb <= 16384")
ssh_keys_string = "\n".join(ssh_public_keys)
completedProcess = run([
join(current_app.root_path, 'shell_scripts/create.sh'),
id,
template_image_file_name,
str(vcpus),
str(memory_mb),
ssh_keys_string
], capture_output=True)
self.validate_completed_process(completedProcess, email)
lines = completedProcess.stdout.splitlines()
status = lines[len(lines)-1].decode("utf-8")
vmSettings = f"""
id={id}
template_image_file_name={template_image_file_name}
vcpus={str(vcpus)}
memory={str(memory_mb)}
ssh_public_keys={ssh_keys_string}
"""
if not status == "success":
raise ValueError(f"""failed to create vm for {email} with:
{vmSettings}
stdout:
{completedProcess.stdout}
stderr:
{completedProcess.stderr}
""")
def destroy(self, email: str, id: str):
validate_capsul_id(id)
completedProcess = run([join(current_app.root_path, 'shell_scripts/destroy.sh'), id], capture_output=True)
self.validate_completed_process(completedProcess, email)
lines = completedProcess.stdout.splitlines()
status = lines[len(lines)-1].decode("utf-8")
if not status == "success":
raise ValueError(f"""failed to destroy vm "{id}" for {email}:
stdout:
{completedProcess.stdout}
stderr:
{completedProcess.stderr}
""")