treerequests 0.0.2

A wrapper for requests for integration with html tree parsers

treerequests

A wrapper around requests like libraries, common html parsers, user agents, browser_cookie3 and argparse libraries.

Installation

pip install treerequests

Dependencies

There are no explicit dependencies for this project, libraries will be imported when explicitly called. The possible modules are:

• browser_cookie3
• bs4
• html5_parser
• selectolax
• lxml
• reliq

Usage

Code

import sys, argparse, requests
from treerequests import Session, args_section, args_session, lxml

requests_prefix = "requests"

parser = argparse.ArgumentParser(description="some cli tool")
args_section(
    parser,
    name="requests section"
    noshortargs=True, # disable shortargs
    prefix=requests_prefix # make all arguments start with "--requests-"
)

args = parser.parse_args(sys.argv[1:])
ses = Session(
    requests,
    requests.Session,
    lxml, # default html parser for get_html()
    wait=0.1
)

# update session by parsed arguments
args_session(
    ses,
    args,
    prefix=requests_prefix,
    raise=True, # raise when requests fail
    timeout=12,
    user_agent=[('desktop','linux',('firefox','chrome'))] # user agent will be chosen randomly from linux desktop, firefox or chrome agents
)

tree = ses.get_html("https://www.youtube.com/")
title = tree.xpath('//title/text()')[0]

newagent(*args) and useragents

useragents is a dictionary storing user agents in categorized way. Please notify me if you find some of them being blocked by sites.

useragents = {
    "desktop": {
        "windows": {
            "firefox": []
            "chrome": [],
            "opera": [],
            "edge": [],
        },
        "linux": {
            "firefox": [],
            "chrome": [],
            "opera": [],
        },
        "macos": {
            "firefox": [],
            "chrome": [],
            "safari": [],
        },
    },
    "phone": {
        "android": {
            "chrome": [],
            "firefox": [],
        },
        "ios": {
            "safari": [],
            "firefox": [],
            "chrome": [],
        },
    },
    "bot": {
        "google": [],
        "bing": [],
        "yandex": [],
        "duckduckgo": [],
    },
}

newagent is a function that returns random user agent from useragents, if no arguments are passed this happens on the whole dict. If only one string argument is specified it gets returned without change.

In other cases arguments restrict amount of choices. If tuples of strings are passed dictionary will be repeatedly accessed by their contents, if final elements is a dictionary then all lists under it are accessed. This can be shortened to passing just strings to get top elements. All arguments represent singular expressions that are concatenated at the end. Passing tuple inside tuple will group results.

newagent() choose from all user agents

newagent('my very special user agent') return string without change

newagent( ('desktop',) ) get desktop agent

newagent( ['desktop'] ) get desktop agent (you can use lists instead of tuples)

newagent( ('desktop',), ('phone',) ) get desktop or phone agent

newagent( 'desktop', 'phone' ) get desktop or phone agent (tuples can be dropped)

newagent( 'desktop', 'phone' ) get desktop or phone agent (tuples can be dropped)

newagent( ('desktop', 'linux') ) get desktop linux agent

newagent( ('desktop', 'linux', 'firefox') ) get agent of firefox from linux on desktop

Get agent from firefox or chrome from windows or linux on desktop, or bots, everything below is equivalent

newagent( ('desktop', 'linux', 'firefox' ), ('desktop', 'linux', 'chrome' ), ('desktop', 'windows', 'firefox' ), ('desktop', 'windows', 'chrome' ), 'bot' )

newagent( ('desktop', ( ( 'linux', 'firefox' ), ( 'linux', 'chrome' ), ( 'windows', 'firefox' ), ( 'windows', 'chrome' ) ) ), 'bot' )

newagent( ('desktop', ( ( 'linux', ( 'firefox', 'chrome' ) ), ( 'windows', ( 'firefox', 'chrome' ) ) ) ), 'bot' )

newagent( ('desktop', ( 'linux', 'windows' ), ( 'firefox', 'chrome' ) ), 'bot' )

HTML parsers

Are defined as functions taking html string and url as arguments, and return objects of parsers, kwargs are passed to initialized object.

parser(text, url, obj=None, **kwargs)

Currently bs4, html5_parser, lxml, lexbor, modest and reliq parsers are defined.

You can specify obj argument to change default class type

from reliq import RQ
from treerequests import reliq, Session
import requests

reliq2 = RQ(cached=True)
ses = Session(requests, requests.Session, lambda x, y: reliq(x,y,obj=reliq2))

Session()

Session(lib, session, tree, **settings) creates and returns object that inherits from session argument, lib is the module from which session is derived, tree is a html parser function.

Settings are passed by settings, and also can be passed to all request methods get, post, head, get_html, get_json etc. where they don't change settings of their session.

import requests
from treerequests import Session, lxml

ses = Session(requests, requests. Session, lxml, user_agent=("desktop","windows"), wait=2)
resp = ses.get('https://wikipedia.org')
print(resp.status_code)

Settings

timeout=30 request timeout

allow_redirects=False allow for redirections

retries=2 number of retries attempted in case of failure

retry_wait=5 waiting time between retries in seconds

force_retry=False retry even if failure indicates it can't succeed

wait=0 waiting time for each request in seconds

wait_random=0 random waiting time up to specified milliseconds

trim=False trim whitespaces from html before passing to parser in get_html

user_agent=[ ("desktop", "windows", ("firefox", "chrome")) ] arguments passed to newagent() function to get user agent

raise=True raise exceptions for failed requests

browser=None get cookies from browsers by browser_cookie3 lib, can be set to string name of function e.g. browser="firefox" or a to any function that returns dict of cookies without taking arguments.

visited=False keep track of visited urls and raise exception if attempt to redownload happens treerequests.AlreadyVisitedError() exception is raised

logger=None log events, if set to str, Path or file object writes events in lines where things are separated by '\t'. If set to list event tuple is appended. It can be set to arbitrary function that takes single tuple argument.

Anything that doesn't match these settings will be directly passed to the original library's function.

You can get settings by treating session like a dict like ses['wait'], values can be changed in similar fashion ses['wait'] = 0.8. Changing values of some settings can implicitly change other settings e.g. user_agent.

get_settings(self, settings: dict, dest: dict = {}, remove: bool = True) -> dict method can be used to create settings dictionary while removing fields from original dictionary (depends on remove).

set_settings(self, settings: dict, remove: bool = True) works similar to get_settings() but updates the session with settings.

visited

visited field is a set() of used urls, that are collected if visited setting is True.

new_user_agent()

Changes user agent according to set rules.

new_browser()

Updates cookies from browser session.

new()

new(self, independent=False, **settings) creates copy of current object, if independent is visited will become a different object and logger will be set to None.

get_html()

get_html(self, url: str, response: bool = False, tree: Callable = None, **settings)

Makes a GET request to url expecting html and returns parser object. Parser can be changed by setting tree to appropriate function.

If response is set response object is returned alongside parser.

import requests
from treerequests import Session, lxml

ses = Session(requests, requests. Session, lxml, user_agent=("desktop","windows"), wait=2)

tree = ses.get_html('https://wikipedia.org')
print(tree.xpath('//title/text()')[0])

tree, resp = ses.get_html('https://wikipedia.org',respose=True)
print(resp.status_code)
print(tree.xpath('//title/text()')[0])

get_json()

get_json(self, url: str, **settings) -> dict

get_json(), post_json(), delete_json(), put_json(), patch_json() take url and **settings as arguments and return dict, making requests using method according to their naming, while expecting json.

args_section()

args_section(
    parser,
    name: str = "Request settings",
    noshortargs: bool = False,
    prefix: str = "",
    rename: list[Tuple[str, str] | Tuple[str] | str] = [],
)

Creates section in ArgumentParser() that is parser. prefix is used only for longargs e.g. --prefix-wait.

If noshortargs is set no shortargs will be defined.

rename is a list of things to remove or rename. If an element of it is a string or tuple with single string then argument gets removed e.g. rename=['location','L',('wait-random',)]. To rename an argument element has to be a tuple with 2 strings e.g. rename=[("wait","delay"),("w","W")]. If used with prefix names renamed should be given without prefix and new name will not include prefix, if you want to keep prefix you'll have to specify it again in new name e.g. prefix="requests", rename=[("location",'requests-redirect')].

import argparse
from treerequests import args_section

parser = argparse.ArgumentParser(description="some cli tool")
args_section(
    parser,
    name="Settings of requests",
    prefix="request",
    noshortargs=True,
    rename=["location",("wait","requests-delay"),("user-agent","ua")] # remove --location, rename --requests-wait to --requests-delay and --requests-user-agent to --ua
)

args = parser.parse_args(sys.argv[1:])

-w, --wait TIME wait before requests, time follows the sleep(1) format of suffixes e.g. 2.8, 2.8s, 5m, 1h, 1d

-W, --wait-random MILLISECONDS wait randomly up to specified milliseconds

-r, --retries NUM number of retries in case of failure

--retry-wait TIME waiting time before retrying

--force-retry retry even if status code indicates it can't succeed

-m, --timeout TIME request timeout

-k, --insecure ignore ssl errors

--user-agent UA set user agent

-B, --browser NAME use cookies extracted from browser e.g. firefox, chromium, chrome, safari, brave, opera, opera_gx (requires browser_cookie3 module)

-L, --location Allow for redirections

--proxies DICT (where DICT is python stringified dictionary) are directly passed to requests library, e.g. --proxies '{"http":"127.0.0.1:8080","ftp":"0.0.0.0"}'.

-H ,--header "Key: Value" very similar to curl --header option, can be specified multiple times e.g. --header 'User: Admin' --header 'Pass: 12345'. Similar to curl Cookie header will be parsed like Cookie: key1=value1; key2=value2 and will be changed to cookies.

-b, --cookie "Key=Value" very similar to curl --cookie option, can be specified multiple times e.g. --cookie 'auth=8f82ab' --cookie 'PHPSESSID=qw3r8an829'.

args_session()

args_session(session, args, prefix="", rename=[], **settings) updates session settings with parsearg values in args. prefix and rename should be the same as was specified for args_section(). You can pass additional settings, parsed arguments take precedence above previous settings.

import sys, argparse, requests
from treerequests import Session, args_section, args_session, lxml

parser = argparse.ArgumentParser(description="some cli tool")
section_rename = ["location"]
args_section(parser,rename=section_rename)

args = parser.parse_args(sys.argv[1:])
session = Session(requests, requests.Session, lxml)
args_session(session, args, rename=section_rename)

tree = ses.get_html("https://www.youtube.com/")