Scrapy学习-24-集成elasticsearch

elasticsearch简单集成到scrapy中

使用elasticsearch的python接口处理数据

 https://github.com/elastic/elasticsearch-dsl-py 

elasticsearch-dsl-py官方使用文档

 http://elasticsearch-dsl.readthedocs.io/en/latest/ 

创建一个DocType类，类似于item类

#　以获取jobbole网站的文章为例

from datetime import datetime
from elasticsearch_dsl import DocType, Date, Nested, Boolean, 
    analyzer, InnerObjectWrapper, Completion, Keyword, Text, Integer

from elasticsearch_dsl.connections import connections
connections.create_connection(hosts=["localhost"])  # 允许连接至多台服务器

class ArticleType(DocType):
    #伯乐在线文章类型
    title = Text(analyzer="ik_max_word")
    create_date = Date()
    url = Keyword()
    url_object_id = Keyword()
    front_image_url = Keyword()
    front_image_path = Keyword()
    praise_nums = Integer()
    comment_nums = Integer()
    fav_nums = Integer()
    tags = Text(analyzer="ik_max_word")
    content = Text(analyzer="ik_max_word")

    class Meta:
        index = "jobbole"
        doc_type = "article"

if __name__ == "__main__":
    ArticleType.init()  # init方法会根据类定义直接生成mapping

创建一个items类，接收数据

class JobBoleArticleItem(scrapy.Item):
    title = scrapy.Field()
    create_date = scrapy.Field(
        input_processor=MapCompose(date_convert),
    )
    url = scrapy.Field()
    url_object_id = scrapy.Field()
    front_image_url = scrapy.Field(
        output_processor=MapCompose(return_value)
    )
    front_image_path = scrapy.Field()
    praise_nums = scrapy.Field(
        input_processor=MapCompose(get_nums)
    )
    comment_nums = scrapy.Field(
        input_processor=MapCompose(get_nums)
    )
    fav_nums = scrapy.Field(
        input_processor=MapCompose(get_nums)
    )
    tags = scrapy.Field(
        input_processor=MapCompose(remove_comment_tags),
        output_processor=Join(",")
    )
    content = scrapy.Field()


    def get_insert_sql(self):
        insert_sql = """
            insert into jobbole_article(title, url, create_date, fav_nums)
            VALUES (%s, %s, %s, %s) ON DUPLICATE KEY UPDATE content=VALUES(fav_nums)
        """
        params = (self["title"], self["url"], self["create_date"], self["fav_nums"])

        return insert_sql, params


    def save_to_es(self):
        article = ArticleType()
        article.title = self['title']
        article.create_date = self["create_date"]
        article.content = remove_tags(self["content"])
        article.front_image_url = self["front_image_url"]
        if "front_image_path" in self:
            article.front_image_path = self["front_image_path"]
        article.praise_nums = self["praise_nums"]
        article.fav_nums = self["fav_nums"]
        article.comment_nums = self["comment_nums"]
        article.url = self["url"]
        article.tags = self["tags"]
        article.meta.id = self["url_object_id"]

        article.save()

        return

创建一个pipeline类，处理elasticsearch数据写入

from models.es_types import ArticleType


class ElasticsearchPipeline(object):

    def process_item(self, item, spider):
        item.save_to_es()

        return item 

配置settings

ITEM_PIPELINES = {
    'ArticleSpider.pipelines.ElasticsearchPipeline': 1
}