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Tarefas assíncronas com django e celery
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Allisson Azevedo
June 11, 2013
Programming
1
24k
Tarefas assíncronas com django e celery
Slides da palestra no mutirão python:
https://plus.google.com/events/c4a18aljra59dqf56t1lac89o4k
Allisson Azevedo
June 11, 2013
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Transcript
TAREFAS ASSÍNCRONAS COM DJANGO E CELERY Allisson Azevedo Monday, June
10, 13
ALLISSON AZEVEDO Graduado em Licenciatura em Computação Desenvolvedor Web http://speakerdeck.com/allisson
http://slideshare.net/allisson http://github.com/allisson http://youtube.com/user/allissonazevedo Monday, June 10, 13
Monday, June 10, 13
Monday, June 10, 13
PORQUE EU PRECISO DE UM TASK/JOB QUEUE? Necessidade de processar
uma tarefa fora do ciclo de requisição e reposta Processamento de vídeo/imagens Envio de e-mails Geração de relatórios complexos Comunicação com API’s externas (twitter, facebook) Monday, June 10, 13
PORQUE EU PRECISO DE UM TASK/JOB QUEUE? Agendar tarefas (substituir
o cron) Trabalhar com indexação de um search engine Monday, June 10, 13
COMO FUNCIONA? Client Quem gera a tarefa Message Broker Gerencia
a fila de tarefas Worker Recebe as tarefas do Broker e executa as mesmas Monday, June 10, 13
COMO FUNCIONA? Result Store Onde são guardados os resultados das
tarefas Monday, June 10, 13
CELERY “Distributed Task Queue” Escrito em python Integração com os
principais frameworks python (django, pyramid, flask, web2py, tornado) Broker Backends (rabbitmq, redis, sqlalchemy, django, mongodb) Result Store Backends (Redis, memcached, MongoDB) Monday, June 10, 13
QUAL BROKER USAR? RabbitMQ (http://stackoverflow.com/a/9176046) Redis Não use o broker
como result store Monday, June 10, 13
INTEGRANDO COM O DJANGO pip install django-celery Adicione o djcelery
no INSTALLED_APPS Adicione as linhas no settings.py import djcelery djcelery.setup_loader() Monday, June 10, 13
INTEGRANDO COM O DJANGO Selecione o broker BROKER_URL = 'redis://localhost:6379/0'
#Redis Inicie o worker python manage.py celery worker --loglevel=info Monday, June 10, 13
INTEGRANDO COM O DJANGO Em seus projetos, crie um arquivo
chamado tasks.py Monday, June 10, 13
INTEGRANDO COM O DJANGO from celery import task @task() def
add(x, y): return x + y Monday, June 10, 13
INTEGRANDO COM O DJANGO Rode a task Monday, June 10,
13
INTEGRANDO COM O DJANGO >>> from celerytest.tasks import add >>>
add.delay(2, 2) >>> add.apply_async((2, 2)) Monday, June 10, 13
MÃO NA MASSA! https://github.com/allisson/django-social-monitor- example Monday, June 10, 13
Monday, June 10, 13
OBRIGADO! Monday, June 10, 13