blob42
/
langchain
forked from Archives/langchain
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add type information for crawler.py (#738)

Browse Source 
Added type information to `crawler.py` to make it safer to use and
understand.
ankush/async-llmchain
Roy Williams 1 year ago committed by GitHub
parent a80897478e
commit d2f882158f
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 108 additions and 82 deletions
Show Stats Download Patch File Download Diff File

2
docs/modules/agents/implementations/natbot.py
Unescape Escape View File

@ -2,7 +2,7 @@
import time
from langchain.chains.natbot.base import NatBotChain
from langchain.chains.natbot.crawler import Crawler # type: ignore
from langchain.chains.natbot.crawler import Crawler
def run_cmd(cmd: str, _crawler: Crawler) -> None:

188
langchain/chains/natbot/crawler.py
Unescape Escape View File

@ -1,9 +1,23 @@
# flake8: noqa
# type: ignore
import time
from sys import platform
black_listed_elements = {
from typing import (
TYPE_CHECKING,
Any,
Dict,
Iterable,
List,
Optional,
Set,
Tuple,
TypedDict,
Union,
)
if TYPE_CHECKING:
from playwright.sync_api import Browser, CDPSession, Page, sync_playwright
black_listed_elements: Set[str] = {
"html",
"head",
"title",
@ -19,8 +33,21 @@ black_listed_elements = {
}
class ElementInViewPort(TypedDict):
node_index: str
backend_node_id: int
node_name: Optional[str]
node_value: Optional[str]
node_meta: List[str]
is_clickable: bool
origin_x: int
origin_y: int
center_x: int
center_y: int
class Crawler:
def __init__(self):
def __init__(self) -> None:
try:
from playwright.sync_api import sync_playwright
except ImportError:
@ -28,16 +55,20 @@ class Crawler:
"Could not import playwright python package. "
"Please it install it with `pip install playwright`."
)
self.browser = sync_playwright().start().chromium.launch(headless=False)
self.page = self.browser.new_page()
self.browser: Browser = (
sync_playwright().start().chromium.launch(headless=False)
)
self.page: Page = self.browser.new_page()
self.page.set_viewport_size({"width": 1280, "height": 1080})
self.page_element_buffer: Dict[int, ElementInViewPort]
self.client: CDPSession
def go_to_page(self, url):
def go_to_page(self, url: str) -> None:
self.page.goto(url=url if "://" in url else "http://" + url)
self.client = self.page.context.new_cdp_session(self.page)
self.page_element_buffer = {}
def scroll(self, direction):
def scroll(self, direction: str) -> None:
if direction == "up":
self.page.evaluate(
"(document.scrollingElement || document.body).scrollTop = (document.scrollingElement || document.body).scrollTop - window.innerHeight;"
@ -47,7 +78,7 @@ class Crawler:
"(document.scrollingElement || document.body).scrollTop = (document.scrollingElement || document.body).scrollTop + window.innerHeight;"
)
def click(self, id):
def click(self, id: Union[str, int]) -> None:
# Inject javascript into the page which removes the target= attribute from all links
js = """
links = document.getElementsByTagName("a");
@ -59,41 +90,37 @@ class Crawler:
element = self.page_element_buffer.get(int(id))
if element:
x = element.get("center_x")
y = element.get("center_y")
x: float = element["center_x"]
y: float = element["center_y"]
self.page.mouse.click(x, y)
else:
print("Could not find element")
def type(self, id, text):
def type(self, id: Union[str, int], text: str) -> None:
self.click(id)
self.page.keyboard.type(text)
def enter(self):
def enter(self) -> None:
self.page.keyboard.press("Enter")
def crawl(self):
def crawl(self) -> List[str]:
page = self.page
page_element_buffer = self.page_element_buffer
start = time.time()
page_state_as_text = []
device_pixel_ratio = page.evaluate("window.devicePixelRatio")
device_pixel_ratio: float = page.evaluate("window.devicePixelRatio")
if platform == "darwin" and device_pixel_ratio == 1: # lies
device_pixel_ratio = 2
win_scroll_x = page.evaluate("window.scrollX")
win_scroll_y = page.evaluate("window.scrollY")
win_upper_bound = page.evaluate("window.pageYOffset")
win_left_bound = page.evaluate("window.pageXOffset")
win_width = page.evaluate("window.screen.width")
win_height = page.evaluate("window.screen.height")
win_right_bound = win_left_bound + win_width
win_lower_bound = win_upper_bound + win_height
document_offset_height = page.evaluate("document.body.offsetHeight")
document_scroll_height = page.evaluate("document.body.scrollHeight")
win_upper_bound: float = page.evaluate("window.pageYOffset")
win_left_bound: float = page.evaluate("window.pageXOffset")
win_width: float = page.evaluate("window.screen.width")
win_height: float = page.evaluate("window.screen.height")
win_right_bound: float = win_left_bound + win_width
win_lower_bound: float = win_upper_bound + win_height
# percentage_progress_start = (win_upper_bound / document_scroll_height) * 100
# percentage_progress_end = (
@ -116,40 +143,35 @@ class Crawler:
"DOMSnapshot.captureSnapshot",
{"computedStyles": [], "includeDOMRects": True, "includePaintOrder": True},
)
strings = tree["strings"]
document = tree["documents"][0]
nodes = document["nodes"]
backend_node_id = nodes["backendNodeId"]
attributes = nodes["attributes"]
node_value = nodes["nodeValue"]
parent = nodes["parentIndex"]
node_types = nodes["nodeType"]
node_names = nodes["nodeName"]
is_clickable = set(nodes["isClickable"]["index"])
text_value = nodes["textValue"]
text_value_index = text_value["index"]
text_value_values = text_value["value"]
input_value = nodes["inputValue"]
input_value_index = input_value["index"]
input_value_values = input_value["value"]
input_checked = nodes["inputChecked"]
layout = document["layout"]
layout_node_index = layout["nodeIndex"]
bounds = layout["bounds"]
cursor = 0
html_elements_text = []
child_nodes = {}
elements_in_view_port = []
anchor_ancestry = {"-1": (False, None)}
button_ancestry = {"-1": (False, None)}
def convert_name(node_name, has_click_handler):
strings: Dict[int, str] = tree["strings"]
document: Dict[str, Any] = tree["documents"][0]
nodes: Dict[str, Any] = document["nodes"]
backend_node_id: Dict[int, int] = nodes["backendNodeId"]
attributes: Dict[int, Dict[int, Any]] = nodes["attributes"]
node_value: Dict[int, int] = nodes["nodeValue"]
parent: Dict[int, int] = nodes["parentIndex"]
node_names: Dict[int, int] = nodes["nodeName"]
is_clickable: Set[int] = set(nodes["isClickable"]["index"])
input_value: Dict[str, Any] = nodes["inputValue"]
input_value_index: List[int] = input_value["index"]
input_value_values: List[int] = input_value["value"]
layout: Dict[str, Any] = document["layout"]
layout_node_index: List[int] = layout["nodeIndex"]
bounds: Dict[int, List[float]] = layout["bounds"]
cursor: int = 0
child_nodes: Dict[str, List[Dict[str, Any]]] = {}
elements_in_view_port: List[ElementInViewPort] = []
anchor_ancestry: Dict[str, Tuple[bool, Optional[int]]] = {"-1": (False, None)}
button_ancestry: Dict[str, Tuple[bool, Optional[int]]] = {"-1": (False, None)}
def convert_name(
node_name: Optional[str], has_click_handler: Optional[bool]
) -> str:
if node_name == "a":
return "link"
if node_name == "input":
@ -163,7 +185,9 @@ class Crawler:
else:
return "text"
def find_attributes(attributes, keys):
def find_attributes(
attributes: Dict[int, Any], keys: List[str]
) -> Dict[str, str]:
values = {}
for [key_index, value_index] in zip(*(iter(attributes),) * 2):
@ -181,7 +205,13 @@ class Crawler:
return values
def add_to_hash_tree(hash_tree, tag, node_id, node_name, parent_id):
def add_to_hash_tree(
hash_tree: Dict[str, Tuple[bool, Optional[int]]],
tag: str,
node_id: int,
node_name: Optional[str],
parent_id: int,
) -> Tuple[bool, Optional[int]]:
parent_id_str = str(parent_id)
if not parent_id_str in hash_tree:
parent_name = strings[node_names[parent_id]].lower()
@ -195,7 +225,7 @@ class Crawler:
# even if the anchor is nested in another anchor, we set the "root" for all descendants to be ::Self
if node_name == tag:
value = (True, node_id)
value: Tuple[bool, Optional[int]] = (True, node_id)
elif (
is_parent_desc_anchor
): # reuse the parent's anchor_id (which could be much higher in the tree)
@ -212,7 +242,7 @@ class Crawler:
for index, node_name_index in enumerate(node_names):
node_parent = parent[index]
node_name = strings[node_name_index].lower()
node_name: Optional[str] = strings[node_name_index].lower()
is_ancestor_of_anchor, anchor_id = add_to_hash_tree(
anchor_ancestry, "a", index, node_name, node_parent
@ -253,7 +283,7 @@ class Crawler:
if not partially_is_in_viewport:
continue
meta_data = []
meta_data: List[str] = []
# inefficient to grab the same set of keys for kinds of objects, but it's fine for now
element_attributes = find_attributes(
@ -274,7 +304,7 @@ class Crawler:
else child_nodes.setdefault(str(ancestor_node_key), [])
)
if node_name == "#text" and ancestor_exception:
if node_name == "#text" and ancestor_exception and ancestor_node:
text = strings[node_value[index]]
if text == "|" or text == "•":
continue
@ -289,7 +319,7 @@ class Crawler:
) # prevent [button ... (button)..]
for key in element_attributes:
if ancestor_exception:
if ancestor_exception and ancestor_node:
ancestor_node.append(
{
"type": "attribute",
@ -344,36 +374,32 @@ class Crawler:
for element in elements_in_view_port:
node_index = element.get("node_index")
node_name = element.get("node_name")
node_value = element.get("node_value")
is_clickable = element.get("is_clickable")
origin_x = element.get("origin_x")
origin_y = element.get("origin_y")
center_x = element.get("center_x")
center_y = element.get("center_y")
meta_data = element.get("node_meta")
inner_text = f"{node_value} " if node_value else ""
element_node_value = element.get("node_value")
node_is_clickable = element.get("is_clickable")
node_meta_data: Optional[List[str]] = element.get("node_meta")
inner_text = f"{element_node_value} " if element_node_value else ""
meta = ""
if node_index in child_nodes:
for child in child_nodes.get(node_index):
for child in child_nodes[node_index]:
entry_type = child.get("type")
entry_value = child.get("value")
if entry_type == "attribute":
if entry_type == "attribute" and node_meta_data:
entry_key = child.get("key")
meta_data.append(f'{entry_key}="{entry_value}"')
node_meta_data.append(f'{entry_key}="{entry_value}"')
else:
inner_text += f"{entry_value} "
if meta_data:
meta_string = " ".join(meta_data)
if node_meta_data:
meta_string = " ".join(node_meta_data)
meta = f" {meta_string}"
if inner_text != "":
inner_text = f"{inner_text.strip()}"
converted_node_name = convert_name(node_name, is_clickable)
converted_node_name = convert_name(node_name, node_is_clickable)
# not very elegant, more like a placeholder
if (

Write Preview
Loading…
Cancel
Save