ruia-peewee-async 1.2.0

A Ruia plugin that uses the peewee-async to store data to MySQL

ruia-peewee-async

A Ruia plugin that uses peewee-async to store data to MySQL or PostgreSQL or both of them.

Installation

pip install ruia-peewee-async[aiomysql]

or

pip install ruia-peewee-async[aiopg]

or

pip install ruia-peewee-async[all]

Usage

from peewee import CharField
from ruia import AttrField, Item, Response, Spider, TextField

from ruia_peewee_async import (RuiaPeeweeInsert, RuiaPeeweeUpdate, TargetDB,
                               after_start)

class DoubanItem(Item):
    target_item = TextField(css_select="tr.item")
    title = AttrField(css_select="a.nbg", attr="title")
    url = AttrField(css_select="a.nbg", attr="href")

    async def clean_title(self, value):
        return value.strip()

class DoubanSpider(Spider):
    start_urls = ["https://movie.douban.com/chart"]
    # aiohttp_kwargs = {"proxy": "http://127.0.0.1:7890"}

    async def parse(self, response: Response):
        async for item in DoubanItem.get_items(html=await response.text()):
            yield RuiaPeeweeInsert(item.results)  # default is MySQL
            # yield RuiaPeeweeInsert(item.results, database=TargetDB.POSTGRES) # save to Postgresql
            # yield RuiaPeeweeInsert(item.results, database=TargetDB.BOTH) # save to both MySQL and Postgresql

class DoubanUpdateSpider(Spider):
    start_urls = ["https://movie.douban.com/chart"]

    async def parse(self, response: Response):
        async for item in DoubanItem.get_items(html=await response.text()):
            res = {}
            res["title"] = item.results["title"]
            res["url"] = "http://whatever.youwanttoupdate.com"
            yield RuiaPeeweeUpdate(
                res,
                {"title": res["title"]},
                database=TargetDB.POSTGRES,  # default is MySQL
            )

            # Args for RuiaPeeweeUpdate
            # data: A dict that's going to be updated in the database.
            # query: A peewee query or a dict to search for the target data in database.
            # database: The target database type.
            # create_when_not_exists: If True, will create a record when data not exists. Default is True.
            # only: A list or tuple of fields that should be updated.

mysql = {
    "host": "127.0.0.1",
    "port": 3306,
    "user": "ruiamysql",
    "password": "abc123",
    "database": "ruiamysql",
    "model": {
        "table_name": "ruia_mysql",
        "title": CharField(),
        "url": CharField(),
    },
}
postgres = {
    "host": "127.0.0.1",
    "port": 5432,
    "user": "ruiapostgres",
    "password": "abc123",
    "database": "ruiapostgres",
    "model": {
        "table_name": "ruia_postgres",
        "title": CharField(),
        "url": CharField(),
    },
}

if __name__ == "__main__":
    DoubanSpider.start(after_start=after_start(mysql=mysql))
    # DoubanSpider.start(after_start=after_start(postgres=postgres))
    # DoubanSpider.start(after_start=after_start(mysql=mysql, postgres=postgres))
    # DoubanUpdateSpider.start(after_start=after_start(mysql=mysql))

Development

Using pyenv to install the version of python that you need. For example

pyenv install 3.7.15

Then go to the root of the project and run:

poetry install

to install all dependencies.

Using poetry shell to enter the virtual environment. Or open your favorite editor and select the virtual environment to start coding.

Using pytest to run unit tests under tests folder.