feat: add basic framework for k8s rest agent

add basic source code for k8s rest agent
close #176

Signed-off-by: Haitao Yue <hightallyht@gmail.com>

build_image/docker/agent/k8s-rest-agent/Dockerfile.in

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+FROM python:3.8
+
+COPY src/agent/k8s-rest-agent/requirements.txt /
+COPY src/agent/k8s-rest-agent/pip /root/.pip
+
+RUN pip install -r /requirements.txt
+
+COPY src/agent/k8s-rest-agent/src /var/www/server
+COPY src/agent/k8s-rest-agent/entrypoint.sh /
+COPY src/agent/k8s-rest-agent/uwsgi/server.ini /etc/uwsgi/apps-enabled/
+RUN mkdir /var/log/supervisor
+
+ENV WEBROOT /
+ENV WEB_CONCURRENCY 10
+ENV DEBUG False
+ENV UWSGI_WORKERS 1
+ENV UWSGI_PROCESSES 1
+ENV UWSGI_OFFLOAD_THREADS 10
+ENV UWSGI_MODULE server.wsgi:application
+
+WORKDIR /var/www/server
+RUN python manage.py collectstatic --noinput
+
+CMD bash /entrypoint.sh

src/agent/k8s-rest-agent/Dockerfile

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+FROM python:3.8
+
+COPY requirements.txt /
+COPY pip /root/.pip
+
+RUN pip install -r /requirements.txt
+
+COPY src /var/www/server
+COPY entrypoint.sh /
+COPY uwsgi/server.ini /etc/uwsgi/apps-enabled/
+RUN mkdir /var/log/supervisor
+
+ENV WEBROOT /
+ENV WEB_CONCURRENCY 10
+ENV DEBUG False
+ENV UWSGI_WORKERS 1
+ENV UWSGI_PROCESSES 1
+ENV UWSGI_OFFLOAD_THREADS 10
+ENV UWSGI_MODULE server.wsgi:application
+
+WORKDIR /var/www/server
+RUN python manage.py collectstatic --noinput
+
+CMD bash /entrypoint.sh

src/agent/k8s-rest-agent/entrypoint.sh

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+#!/usr/bin/env bash
+
+if [[ "$RUN_TYPE" == "SERVER" ]]; then
+  uwsgi --ini /etc/uwsgi/apps-enabled/server.ini;
+else
+  if [[ "$RUN_TYPE" == "TASK" ]]; then
+    celery -A server worker --autoscale=20,6 -l info
+  elif [[ "$RUN_TYPE" == "BEAT_TASK" ]]; then
+    celery -A server beat -l info --scheduler django_celery_beat.schedulers:DatabaseScheduler --pidfile=/opt/celeryd.pid
+  fi
+fi

src/agent/k8s-rest-agent/pip/pip.conf

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+[global]
+index-url=http://mirrors.cloud.aliyuncs.com/pypi/simple/
+
+[install]
+trusted-host=mirrors.cloud.aliyuncs.com

src/agent/k8s-rest-agent/requirements.txt

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+Django>=3.0
+uwsgi
+enum34
+djangorestframework
+holdup>1.5.0,<=1.6.0
+drf-yasg<=1.17.0
+swagger_spec_validator<=2.4.1
+psycopg2-binary
+celery<5.0,>=4.4
+redis
+requests
+supervisor
+django-celery-beat
+django-celery-results
+django-3-jet
+djangorestframework-jwt<=1.11.0
+python-jwt # 需要安装，否则会出现token解码失败错误
+shortuuid

src/agent/k8s-rest-agent/src/api/admin.py

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+from django.contrib import admin
+
+# Register your models here.

src/agent/k8s-rest-agent/src/api/apps.py

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+from django.apps import AppConfig
+
+
+class ApiConfig(AppConfig):
+    name = "api"

src/agent/k8s-rest-agent/src/api/auth.py

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+import base64
+import json
+import logging
+
+from django.contrib.auth import get_user_model
+from django.utils.translation import ugettext as _
+from rest_framework import authentication
+from rest_framework import exceptions
+from rest_framework_jwt.authentication import (
+    JSONWebTokenAuthentication as CoreJSONWebTokenAuthentication,
+)
+from rest_framework_jwt.settings import api_settings
+
+jwt_decode_handler = api_settings.JWT_DECODE_HANDLER
+jwt_get_username_from_payload = api_settings.JWT_PAYLOAD_GET_USERNAME_HANDLER
+User = get_user_model()
+
+LOG = logging.getLogger(__name__)
+
+
+class JSONWebTokenAuthentication(CoreJSONWebTokenAuthentication):
+    @staticmethod
+    def _get_or_create_user(user_id, payload=None):
+        if payload is None:
+            payload = {}
+
+        user, _ = User.objects.get_or_create(
+            id=user_id, username=user_id, defaults={"password": user_id}
+        )
+
+        return user
+
+    def authenticate_credentials(self, payload):
+        """
+        Returns an active user that matches the payload's user id and email.
+        """
+        username = jwt_get_username_from_payload(payload)
+
+        if not username:
+            msg = _("Invalid payload.")
+            raise exceptions.AuthenticationFailed(msg)
+
+        user = self._get_or_create_user(username, payload)
+
+        if not user.is_active:
+            msg = _("User account is disabled.")
+            raise exceptions.AuthenticationFailed(msg)
+
+        return user
+
+
+class IstioJWTAuthentication(authentication.BaseAuthentication):
+    def authenticate(self, request):
+        token = request.META.get("HTTP_TOKEN", None)
+        if token is None:
+            return None
+
+        token += "=" * (-len(token) % 4)
+        token = base64.b64decode(token)
+        token = json.loads(token)
+        user_id = token.get("sub", None)
+        if user_id is None:
+            return None
+        user, _ = User.objects.get_or_create(
+            id=user_id, username=user_id, defaults={"password": user_id}
+        )
+        return user, None

src/agent/k8s-rest-agent/src/api/management/commands/test_task.py

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+from django.core.management import BaseCommand
+from api.tasks import example_task
+from django_celery_beat.models import IntervalSchedule, PeriodicTask
+
+
+class Command(BaseCommand):
+    help = "Test Task"
+
+    def handle(self, *args, **options):
+        interval = IntervalSchedule.objects.first()
+        PeriodicTask.objects.create(
+            interval=interval, name="example", task="server.tasks.example_task"
+        )
+        # example_task.delay()

src/agent/k8s-rest-agent/src/api/models/__init__.py

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+from .user import User, Profile

src/agent/k8s-rest-agent/src/api/models/user.py

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+from django.contrib.auth.models import AbstractUser
+from django.db import models
+from django.db.models.signals import post_save
+from api.utils.db_functions import make_uuid
+
+
+class User(AbstractUser):
+    roles = []
+
+    id = models.UUIDField(
+        primary_key=True,
+        help_text="ID of user",
+        default=make_uuid,
+        editable=True,
+    )
+    username = models.CharField(default="", max_length=128, unique=True)
+
+    def __str__(self):
+        return self.username
+
+
+class Profile(models.Model):
+    user = models.OneToOneField(
+        User, related_name="profile", on_delete=models.CASCADE
+    )
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    def __str__(self):
+        return "%s's profile" % self.user
+
+    class Meta:
+        ordering = ("-created_at",)
+
+
+def create_user_profile(sender, instance, created, **kwargs):
+    if created:
+        Profile.objects.create(user=instance)
+
+
+post_save.connect(create_user_profile, sender=User)
+
+# Create your models here.

src/agent/k8s-rest-agent/src/api/routes/hello/views.py

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+import logging
+import os
+
+from rest_framework import viewsets, status
+from drf_yasg.utils import swagger_auto_schema
+from rest_framework.decorators import action, permission_classes
+from rest_framework.permissions import IsAuthenticated
+from rest_framework.response import Response
+
+from api.auth import JSONWebTokenAuthentication, IstioJWTAuthentication
+from api.utils.mixins import PermissionsPerMethodMixin
+
+LOG = logging.getLogger(__name__)
+APP_VERSION = os.getenv("APP_VERSION", "v1")
+
+
+class HelloViewSet(PermissionsPerMethodMixin, viewsets.ViewSet):
+    authentication_classes = (IstioJWTAuthentication,)
+
+    @swagger_auto_schema(
+        operation_summary="Hello world", operation_description="Hello world"
+    )
+    def list(self, request):
+        return Response(
+            {"hello": "world %s" % APP_VERSION}, status=status.HTTP_200_OK
+        )
+
+    @swagger_auto_schema(operation_summary="hello world need auth")
+    @action(
+        methods=["get"],
+        url_path="need-auth",
+        url_name="need-auth",
+        detail=False,
+    )
+    # @permission_classes((IsAuthenticated,))
+    def need_auth(self, request):
+        LOG.info("request user %s", request.user)
+        return Response(
+            {"hello": "auth world %s" % APP_VERSION}, status=status.HTTP_200_OK
+        )

src/agent/k8s-rest-agent/src/api/tasks/__init__.py

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+from api.tasks.task.example import example_task

src/agent/k8s-rest-agent/src/api/tasks/task/example.py

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+import logging
+
+from server.celery import app
+
+
+LOG = logging.getLogger(__name__)
+
+
+@app.task(name="example_task")
+def example_task():
+    LOG.info("example task")
+    return True

src/agent/k8s-rest-agent/src/api/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

src/agent/k8s-rest-agent/src/api/utils/common/__init__.py

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+from .swagger import with_common_response
+from .db import paginate_list

src/agent/k8s-rest-agent/src/api/utils/common/db.py

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+from django.core.paginator import Paginator
+from django.db.models import Func
+
+
+class Round(Func):
+    function = "ROUND"
+    arity = 2
+
+
+def paginate_list(data=None, page=1, per_page=10, limit=None):
+    if not data:
+        data = []
+
+    total = len(data)
+
+    if per_page != -1:
+        p = Paginator(data, per_page)
+        last_page = p.page_range[-1]
+        page = page if page <= last_page else last_page
+        data = p.page(page)
+        total = p.count
+    else:
+        if limit:
+            data = data[:limit]
+
+    return data, total

src/agent/k8s-rest-agent/src/api/utils/common/swagger.py

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+from drf_yasg import openapi
+from rest_framework import serializers
+from rest_framework import status
+
+from api.utils.serializers import BadResponseSerializer
+
+basic_type_info = [
+    (serializers.CharField, openapi.TYPE_STRING),
+    (serializers.BooleanField, openapi.TYPE_BOOLEAN),
+    (serializers.IntegerField, openapi.TYPE_INTEGER),
+    (serializers.FloatField, openapi.TYPE_NUMBER),
+    (serializers.FileField, openapi.TYPE_FILE),
+    (serializers.ImageField, openapi.TYPE_FILE),
+]
+
+
+def to_form_paras(self):
+    custom_paras = []
+    for field_name, field in self.fields.items():
+        type_str = openapi.TYPE_STRING
+        for field_class, type_format in basic_type_info:
+            if isinstance(field, field_class):
+                type_str = type_format
+        help_text = getattr(field, "help_text")
+        default = getattr(field, "default", None)
+        required = getattr(field, "required")
+        if callable(default):
+            custom_paras.append(
+                openapi.Parameter(
+                    field_name,
+                    openapi.IN_FORM,
+                    help_text,
+                    type=type_str,
+                    required=required,
+                )
+            )
+        else:
+            custom_paras.append(
+                openapi.Parameter(
+                    field_name,
+                    openapi.IN_FORM,
+                    help_text,
+                    type=type_str,
+                    required=required,
+                    default=default,
+                )
+            )
+    return custom_paras
+
+
+def with_common_response(responses=None):
+    if responses is None:
+        responses = {}
+
+    responses.update(
+        {
+            status.HTTP_400_BAD_REQUEST: BadResponseSerializer,
+            status.HTTP_500_INTERNAL_SERVER_ERROR: "Internal Error",
+        }
+    )
+
+    return responses

src/agent/k8s-rest-agent/src/api/utils/db_functions.py

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+import uuid
+import shortuuid
+
+
+def make_uuid():
+    return str(uuid.uuid4())
+
+
+def make_uuid_hex():
+    return uuid.uuid4().hex
+
+
+def make_short_uuid():
+    return shortuuid.ShortUUID().random(length=16)