uncloud/api/helper.py
meow 93dee1c9fc New Features + Refactoring
1. User can now use image name instead of image uuid when creation vm.
   For Example, now user can create an alpine vm using the following
   command
   ```shell
   ucloud-cli vm create --vm-name myvm --cpu 2 --ram '2GB' \
       --os-ssd '10GB' --image images:alpine
   ```
2. Instead of directly running code, code is now placed under a function
   main and is called using the following code
   ```python
   if __name__ == "__main__":
       main()
   ```
3. Multiprocess (Process) is used instead of threading (Thread) to update
   heart beat of host.
4. IP Address of vm is included in vm's status which is retrieved by the
   following command
   ```shell
   ucloud-cli vm status --vm-name myvm
   ```
2019-11-02 20:42:24 +05:00

142 lines
4.6 KiB
Python
Executable file

import binascii
import requests
import random
import subprocess as sp
import ipaddress
from decouple import config
from pyotp import TOTP
from config import VM_POOL, etcd_client, IMAGE_PREFIX
def check_otp(name, realm, token):
try:
data = {
"auth_name": config("AUTH_NAME", ""),
"auth_token": TOTP(config("AUTH_SEED", "")).now(),
"auth_realm": config("AUTH_REALM", ""),
"name": name,
"realm": realm,
"token": token,
}
except binascii.Error:
return 400
response = requests.get(
"{OTP_SERVER}{OTP_VERIFY_ENDPOINT}".format(
OTP_SERVER=config("OTP_SERVER", ""),
OTP_VERIFY_ENDPOINT=config("OTP_VERIFY_ENDPOINT", "verify"),
),
json=data,
)
return response.status_code
def resolve_vm_name(name, owner):
"""Return UUID of Virtual Machine of name == name and owner == owner
Input: name of vm, owner of vm.
Output: uuid of vm if found otherwise None
"""
result = next(
filter(
lambda vm: vm.value["owner"] == owner and vm.value["name"] == name,
VM_POOL.vms,
),
None,
)
if result:
return result.key.split("/")[-1]
return None
def resolve_image_name(name, etcd_client):
"""Return image uuid given its name and its store
* If the provided name is not in correct format
i.e {store_name}:{image_name} return ValueError
* If no such image found then return KeyError
"""
seperator = ":"
# Ensure, user/program passed valid name that is of type string
try:
store_name_and_image_name = name.split(seperator)
"""
Examples, where it would work and where it would raise exception
"images:alpine" --> ["images", "alpine"]
"images" --> ["images"] it would raise Exception as non enough value to unpack
"images:alpine:meow" --> ["images", "alpine", "meow"] it would raise Exception
as too many values to unpack
"""
store_name, image_name = store_name_and_image_name
except Exception:
raise ValueError("Image name not in correct format i.e {store_name}:{image_name}")
images = etcd_client.get_prefix(IMAGE_PREFIX, value_in_json=True)
# Try to find image with name == image_name and store_name == store_name
try:
image = next(filter(lambda im: im.value['name'] == image_name \
and im.value['store_name'] == store_name, images))
except StopIteration:
raise KeyError("No image with name {} found.".format(name))
else:
image_uuid = image.key.split('/')[-1]
return image_uuid
def random_bytes(num=6):
return [random.randrange(256) for _ in range(num)]
def generate_mac(uaa=False, multicast=False, oui=None, separator=':', byte_fmt='%02x'):
mac = random_bytes()
if oui:
if type(oui) == str:
oui = [int(chunk) for chunk in oui.split(separator)]
mac = oui + random_bytes(num=6-len(oui))
else:
if multicast:
mac[0] |= 1 # set bit 0
else:
mac[0] &= ~1 # clear bit 0
if uaa:
mac[0] &= ~(1 << 1) # clear bit 1
else:
mac[0] |= 1 << 1 # set bit 1
return separator.join(byte_fmt % b for b in mac)
def get_ip_addr(mac_address, device):
"""Return IP address of a device provided its mac address / link local address
and the device with which it is connected.
For Example, if we call get_ip_addr(mac_address="52:54:00:12:34:56", device="br0")
the following two scenarios can happen
1. It would return None if we can't be able to find device whose mac_address is equal
to the arg:mac_address or the mentioned arg:device does not exists or the ip address
we found is local.
2. It would return ip_address of device whose mac_address is equal to arg:mac_address
and is connected/neighbor of arg:device
"""
try:
output = sp.check_output(['ip','-6','neigh', 'show', 'dev', device], stderr=sp.PIPE)
except sp.CalledProcessError:
return None
else:
result = []
output = output.strip().decode("utf-8")
output = output.split("\n")
for entry in output:
entry = entry.split()
if entry:
ip = ipaddress.ip_address(entry[0])
mac = entry[2]
if ip.is_global and mac_address == mac:
result.append(ip)
return result