updated README.md

README.md

@@ -32,11 +32,17 @@ python ./bin/run_worker.py
 # TODO: frontend
 ```
 
-## Nodes
+## Architecture
+
+The architecture of Crawlab is as below. It's very similar to Celery architecture, but a few more modules including Frontend, Spiders and Flower are added to feature the crawling management functionality. 
+
+![crawlab-architecture](./docs/img/crawlab-architecture.png)
+
+### Nodes
 
 Nodes are actually the workers defined in Celery. A node is running and connected to a task queue, redis for example, to receive and run tasks. As spiders need to be deployed to the nodes, users should specify their ip addresses and ports before the deployment.
 
-## Spiders
+### Spiders
 
 #### Auto Discovery
 In `config.py` file, edit `PROJECT_SOURCE_FILE_FOLDER` as the directory where the spiders projects are located. The web app will discover spider projects automatically.
@@ -49,6 +55,6 @@ All spiders need to be deployed to a specific node before crawling. Simply click
 
 After deploying the spider, you can click "Run" button on spider detail page and select a specific node to start crawling. It will triggers a task for the crawling, where you can see in detail in tasks page.
 
-## Tasks
+### Tasks
 
-Tasks are triggered and run by the workers. Users can check the task status info and logs in the task detail page. 
+Tasks are triggered and run by the workers. Users can check the task status info and logs in the task detail page. 

crawlab/constants/manage.py

@@ -1,4 +1,5 @@
 class ActionType:
     APP = 'app'
     FLOWER = 'flower'
+    WORKER = 'worker'
     RUN_ALL = 'run_all'

crawlab/manage.py

@@ -1,5 +1,6 @@
 import os
 import subprocess
+import sys
 from multiprocessing import Process
 
 import click
@@ -7,6 +8,10 @@ from flask import Flask
 from flask_cors import CORS
 from flask_restful import Api
 
+file_dir = os.path.dirname(os.path.realpath(__file__))
+root_path = os.path.abspath(os.path.join(file_dir, '.'))
+sys.path.append(root_path)
+
 from config import FLASK_HOST, FLASK_PORT, PROJECT_LOGS_FOLDER, BROKER_URL
 from constants.manage import ActionType
 from routes.deploys import DeployApi
@@ -15,6 +20,7 @@ from routes.nodes import NodeApi
 from routes.spiders import SpiderApi, SpiderImportApi, SpiderManageApi
 from routes.stats import StatsApi
 from routes.tasks import TaskApi
+from tasks.celery import celery_app
 
 # flask app instance
 app = Flask(__name__)
@@ -72,6 +78,13 @@ def run_flower():
             print(line.decode('utf-8'))
 
 
+def run_worker():
+    if sys.platform == 'windows':
+        celery_app.start(argv=['tasks', 'worker', '-P', 'eventlet', '-E', '-l', 'INFO'])
+    else:
+        celery_app.start(argv=['tasks', 'worker', '-E', '-l', 'INFO'])
+
+
 @click.command()
 @click.argument('action', type=click.Choice([ActionType.APP, ActionType.FLOWER, ActionType.RUN_ALL]))
 def main(action):

spiders/baidu/baidu/items.py

@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+
+# Define here the models for your scraped items
+#
+# See documentation in:
+# https://doc.scrapy.org/en/latest/topics/items.html
+
+import scrapy
+
+
+class BaiduItem(scrapy.Item):
+    # define the fields for your item here like:
+    title = scrapy.Field()
+    url = scrapy.Field()

spiders/baidu/baidu/middlewares.py

@@ -0,0 +1,103 @@
+# -*- coding: utf-8 -*-
+
+# Define here the models for your spider middleware
+#
+# See documentation in:
+# https://doc.scrapy.org/en/latest/topics/spider-middleware.html
+
+from scrapy import signals
+
+
+class BaiduSpiderMiddleware(object):
+    # Not all methods need to be defined. If a method is not defined,
+    # scrapy acts as if the spider middleware does not modify the
+    # passed objects.
+
+    @classmethod
+    def from_crawler(cls, crawler):
+        # This method is used by Scrapy to create your spiders.
+        s = cls()
+        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
+        return s
+
+    def process_spider_input(self, response, spider):
+        # Called for each response that goes through the spider
+        # middleware and into the spider.
+
+        # Should return None or raise an exception.
+        return None
+
+    def process_spider_output(self, response, result, spider):
+        # Called with the results returned from the Spider, after
+        # it has processed the response.
+
+        # Must return an iterable of Request, dict or Item objects.
+        for i in result:
+            yield i
+
+    def process_spider_exception(self, response, exception, spider):
+        # Called when a spider or process_spider_input() method
+        # (from other spider middleware) raises an exception.
+
+        # Should return either None or an iterable of Response, dict
+        # or Item objects.
+        pass
+
+    def process_start_requests(self, start_requests, spider):
+        # Called with the start requests of the spider, and works
+        # similarly to the process_spider_output() method, except
+        # that it doesn’t have a response associated.
+
+        # Must return only requests (not items).
+        for r in start_requests:
+            yield r
+
+    def spider_opened(self, spider):
+        spider.logger.info('Spider opened: %s' % spider.name)
+
+
+class BaiduDownloaderMiddleware(object):
+    # Not all methods need to be defined. If a method is not defined,
+    # scrapy acts as if the downloader middleware does not modify the
+    # passed objects.
+
+    @classmethod
+    def from_crawler(cls, crawler):
+        # This method is used by Scrapy to create your spiders.
+        s = cls()
+        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
+        return s
+
+    def process_request(self, request, spider):
+        # Called for each request that goes through the downloader
+        # middleware.
+
+        # Must either:
+        # - return None: continue processing this request
+        # - or return a Response object
+        # - or return a Request object
+        # - or raise IgnoreRequest: process_exception() methods of
+        #   installed downloader middleware will be called
+        return None
+
+    def process_response(self, request, response, spider):
+        # Called with the response returned from the downloader.
+
+        # Must either;
+        # - return a Response object
+        # - return a Request object
+        # - or raise IgnoreRequest
+        return response
+
+    def process_exception(self, request, exception, spider):
+        # Called when a download handler or a process_request()
+        # (from other downloader middleware) raises an exception.
+
+        # Must either:
+        # - return None: continue processing this exception
+        # - return a Response object: stops process_exception() chain
+        # - return a Request object: stops process_exception() chain
+        pass
+
+    def spider_opened(self, spider):
+        spider.logger.info('Spider opened: %s' % spider.name)

spiders/baidu/baidu/pipelines.py

@@ -0,0 +1,11 @@
+# -*- coding: utf-8 -*-
+
+# Define your item pipelines here
+#
+# Don't forget to add your pipeline to the ITEM_PIPELINES setting
+# See: https://doc.scrapy.org/en/latest/topics/item-pipeline.html
+
+
+class BaiduPipeline(object):
+    def process_item(self, item, spider):
+        return item

spiders/baidu/baidu/settings.py

@@ -0,0 +1,91 @@
+# -*- coding: utf-8 -*-
+
+# Scrapy settings for baidu project
+#
+# For simplicity, this file contains only settings considered important or
+# commonly used. You can find more settings consulting the documentation:
+#
+#     https://doc.scrapy.org/en/latest/topics/settings.html
+#     https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
+#     https://doc.scrapy.org/en/latest/topics/spider-middleware.html
+
+BOT_NAME = 'baidu'
+
+SPIDER_MODULES = ['baidu.spiders']
+NEWSPIDER_MODULE = 'baidu.spiders'
+
+
+# Crawl responsibly by identifying yourself (and your website) on the user-agent
+#USER_AGENT = 'baidu (+http://www.yourdomain.com)'
+
+# Obey robots.txt rules
+# ROBOTSTXT_OBEY = True
+ROBOTSTXT_OBEY = False
+
+# Configure maximum concurrent requests performed by Scrapy (default: 16)
+#CONCURRENT_REQUESTS = 32
+
+# Configure a delay for requests for the same website (default: 0)
+# See https://doc.scrapy.org/en/latest/topics/settings.html#download-delay
+# See also autothrottle settings and docs
+#DOWNLOAD_DELAY = 3
+# The download delay setting will honor only one of:
+#CONCURRENT_REQUESTS_PER_DOMAIN = 16
+#CONCURRENT_REQUESTS_PER_IP = 16
+
+# Disable cookies (enabled by default)
+#COOKIES_ENABLED = False
+
+# Disable Telnet Console (enabled by default)
+#TELNETCONSOLE_ENABLED = False
+
+# Override the default request headers:
+#DEFAULT_REQUEST_HEADERS = {
+#   'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
+#   'Accept-Language': 'en',
+#}
+
+# Enable or disable spider middlewares
+# See https://doc.scrapy.org/en/latest/topics/spider-middleware.html
+#SPIDER_MIDDLEWARES = {
+#    'baidu.middlewares.BaiduSpiderMiddleware': 543,
+#}
+
+# Enable or disable downloader middlewares
+# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
+#DOWNLOADER_MIDDLEWARES = {
+#    'baidu.middlewares.BaiduDownloaderMiddleware': 543,
+#}
+
+# Enable or disable extensions
+# See https://doc.scrapy.org/en/latest/topics/extensions.html
+#EXTENSIONS = {
+#    'scrapy.extensions.telnet.TelnetConsole': None,
+#}
+
+# Configure item pipelines
+# See https://doc.scrapy.org/en/latest/topics/item-pipeline.html
+#ITEM_PIPELINES = {
+#    'baidu.pipelines.BaiduPipeline': 300,
+#}
+
+# Enable and configure the AutoThrottle extension (disabled by default)
+# See https://doc.scrapy.org/en/latest/topics/autothrottle.html
+#AUTOTHROTTLE_ENABLED = True
+# The initial download delay
+#AUTOTHROTTLE_START_DELAY = 5
+# The maximum download delay to be set in case of high latencies
+#AUTOTHROTTLE_MAX_DELAY = 60
+# The average number of requests Scrapy should be sending in parallel to
+# each remote server
+#AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
+# Enable showing throttling stats for every response received:
+#AUTOTHROTTLE_DEBUG = False
+
+# Enable and configure HTTP caching (disabled by default)
+# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
+#HTTPCACHE_ENABLED = True
+#HTTPCACHE_EXPIRATION_SECS = 0
+#HTTPCACHE_DIR = 'httpcache'
+#HTTPCACHE_IGNORE_HTTP_CODES = []
+#HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'

spiders/baidu/baidu/spiders/__init__.py

@@ -0,0 +1,4 @@
+# This package will contain the spiders of your Scrapy project
+#
+# Please refer to the documentation for information on how to create and manage
+# your spiders.

spiders/baidu/baidu/spiders/baidu_spider.py

@@ -0,0 +1,13 @@
+# -*- coding: utf-8 -*-
+from time import sleep
+
+import scrapy
+
+
+class BaiduSpiderSpider(scrapy.Spider):
+    name = 'baidu_spider'
+    allowed_domains = ['baidu.com']
+    start_urls = ['http://baidu.com/s?wd=百度']
+
+    def parse(self, response):
+        sleep(30)

spiders/baidu/scrapy.cfg

@@ -0,0 +1,11 @@
+# Automatically created by: scrapy startproject
+#
+# For more information about the [deploy] section see:
+# https://scrapyd.readthedocs.io/en/latest/deploy.html
+
+[settings]
+default = baidu.settings
+
+[deploy]
+#url = http://localhost:6800/
+project = baidu