Django 学习

我的应用很简单。我只需要读取指定日期的收益金额，并保存到我的本地数据库。

我在djaongo项目中创建了一个新的应用，叫做“adsense”。并创建了一个models.py文件来存储认证证书。

from django.contrib.auth.models import User
from django.db import models
from oauth2client.django_orm import CredentialsField

class Credential(models.Model):
    id = models.ForeignKey(User, primary_key=True)
    credential = CredentialsField()

class Revenue(models.Model):
    date = models.DateField(unique=True)
    revenue = models.DecimalField(max_digits=7, decimal_places=2)

    def __unicode__(self):
        return '{0} ${1}'.format(self.date, self.revenue)

我把从API控制台下载的JSON文件放到我的应用的文件夹下面，并创建了一个views.py文件：

import os

from django.conf import settings
from django.contrib.auth.decorators import login_required
from django.contrib.sites.models import Site
from django.http import HttpResponseBadRequest, HttpResponse
from django.http import HttpResponseRedirect
from oauth2client import xsrfutil
from oauth2client.client import flow_from_clientsecrets
from oauth2client.django_orm import Storage

from .models import Credential

CLIENT_SECRETS = os.path.join(os.path.dirname(__file__), 'client_secrets.json')

FLOW = flow_from_clientsecrets(
    CLIENT_SECRETS,
    scope='https://www.googleapis.com/auth/adsense.readonly',
    redirect_uri='http://{0}/adsense/oauth2callback/'.format(
        Site.objects.get_current().domain))

@login_required
def index(request):
    storage = Storage(Credential, 'id', request.user, 'credential')
    credential = storage.get()
    if credential is None or credential.invalid is True:
        FLOW.params['state'] = xsrfutil.generate_token(settings.SECRET_KEY,
                                                       request.user)
        authorize_url = FLOW.step1_get_authorize_url()
        return HttpResponseRedirect(authorize_url)
    else:
        return HttpResponse('Already validated.')

@login_required
def auth_return(request):
    if not xsrfutil.validate_token(settings.SECRET_KEY,
                                   request.REQUEST['state'], request.user):
        return  HttpResponseBadRequest()
    credential = FLOW.step2_exchange(request.REQUEST)
    storage = Storage(Credential, 'id', request.user, 'credential')
    storage.put(credential)
    return HttpResponseRedirect("/")

在 urls.py 文件中我包含了一个链接指向我的应用的url文件

main urls.py:

from django.conf.urls import patterns, include, url
from django.contrib import admin

admin.autodiscover()

urlpatterns = patterns(
    '',
    url(r'^adsense/', include('adsense.urls', namespace='adsense')),

    url(r'^admin/doc/', include('django.contrib.admindocs.urls')),
    url(r'^admin/', include(admin.site.urls)),
)

adsense/urls.py:

from django.conf.urls import patterns, url

urlpatterns = patterns(
    'adsense.views',
    url(r'^$', 'index', name='index'),
    url(r'^oauth2callback/$', 'auth_return', name='auth_return'),
)

最后，创建了一个通过给定日期调用API并获取收益的类。它放在adsense/tasks.py，因为我准备把它当作任务，钩在  Celery/  RabbitMQ之上。

import datetime
import httplib2

from apiclient.discovery import build
from django.contrib.auth.models import User
from oauth2client.django_orm import Storage

from .models import Credential, Revenue

TODAY = datetime.date.today()
YESTERDAY = TODAY - datetime.timedelta(days=1)

class Scraper(object):
    def get_report(self, start_date=YESTERDAY, end_date=TODAY):
        user = User.objects.get(pk=1)
        storage = Storage(Credential, 'id', user, 'credential')
        credential = storage.get()
        if not credential is None or credential.invalid is False:
            http = httplib2.Http()
            http = credential.authorize(http)
            service = build('adsense', 'v1.2', http=http)
            reports = service.reports()
            report = reports.generate(
                startDate=start_date.strftime('%Y-%m-%d'),
                endDate=end_date.strftime('%Y-%m-%d'),
                dimension='DATE',
                metric='EARNINGS',
            )
            data = report.execute()
            for row in data['rows']:
                date = row[0]
                revenue = row[1]

                record = Revenue()
                try:
                    r = Revenue.objects.get(date=date)
                    pk = r.id
                except Revenue.DoesNotExist:
                    pk = None
                record.id = pk
                record.date = date
                record.revenue = revenue
                record.save()

为了让它能工作起来，我在浏览器打开http://localhost:8000/adsense/。这时候会要求我登录Google帐号。我为我的应用授权来访问Adsense。然后，认证证书就会保存在我的本地数据库，然后我可以调用Scraper get_report() 方法。祝贺我吧！。它能顺利工作了。