ghostscraper 0.6.1

A Playwright-based web scraper with persistent caching, parallel scraping, progress callbacks, and multiple output formats

Ghostscraper

A Playwright-based web scraper with persistent caching, automatic browser installation, and multiple output formats.

Changelog

See CHANGELOG.md for the full version history.

Overview

GhostScraper wraps Playwright with persistent JSON caching (via cacherator.JSONCache), retry logic, and multiple output formats. The primary interface is GhostScraper. PlaywrightScraper is the lower-level browser automation layer used internally.

All scraping methods are async. Results (html, response_code, response_headers, redirect_chain) are cached to disk on first fetch and restored on subsequent instantiation with the same URL. Derived outputs (markdown, text, authors, soup, seo, article) are computed in-memory from the cached HTML and are not persisted.

Installation

pip install ghostscraper

GhostScraper

Constructor

GhostScraper(
    url: str = "",
    clear_cache: bool = False,
    ttl: int = 999,
    markdown_options: Optional[Dict[str, Any]] = None,
    logging: bool = True,
    dynamodb_table: Optional[str] = None,
    on_progress: Optional[Callable] = None,
    **kwargs  # passed to PlaywrightScraper
)

Parameters:

• url: The URL to scrape.
• clear_cache: Clear existing cache on initialization. Default: False.
• ttl: Cache time-to-live in days. Default: 999.
• markdown_options: Options forwarded to html2text.HTML2Text for Markdown conversion.
• logging: Enable/disable logging. Default: True.
• dynamodb_table: DynamoDB table name for cross-machine caching. Replaces local cache when set. Default: None.
• on_progress: Callback fired at key scraping events. Accepts sync and async callables. Default: None.
• **kwargs: Forwarded to PlaywrightScraper (see below).

PlaywrightScraper kwargs:

• browser_type: "chromium" | "firefox" | "webkit". Default: "chromium".
• headless: Run browser headlessly. Default: True.
• browser_args: Extra args passed to browser.launch().
• context_args: Extra args passed to browser.new_context().
• max_retries: Retry attempts per URL. Default: 3.
• backoff_factor: Exponential backoff multiplier. Default: 2.0.
• network_idle_timeout: Timeout in ms for the networkidle strategy. Default: 3000.
• load_timeout: Timeout in ms for all other strategies. Default: 20000.
• wait_for_selectors: CSS selectors to wait for after page load.
• load_strategies: Loading strategy chain. Default: ["load", "networkidle", "domcontentloaded"].
• no_retry_on: Status codes that abort retries immediately (e.g. [404, 410]). Default: None.

Instance Attributes

• url (str): The URL this scraper was initialized with.
• error (Exception | None): Set when a fetch fails under fail_fast=False in scrape_many. When set, html() returns "" and response_code() returns None.

Methods

All methods trigger a fetch (or cache restore) on first call. Subsequent calls return the cached/computed value.

async html() -> str

Raw HTML of the page. Returns "" if self.error is set.

async response_code() -> Optional[int]

HTTP status code. Returns None if self.error is set.

async response_headers() -> dict

HTTP response headers from the final response. Cached alongside HTML.

async redirect_chain() -> list

Full list of responses during navigation. Each entry: {"url": str, "status": int}. Cached alongside HTML.

[
    {"url": "https://example.com/old", "status": 301},
    {"url": "https://example.com/new", "status": 200},
]

async final_url() -> str

URL of the last entry in redirect_chain(). Falls back to self.url if chain is empty.

async markdown() -> str

Page content converted to Markdown via html2text. Respects markdown_options.

async text() -> str

Plain text extracted via newspaper4k.

async authors() -> list

Authors detected by newspaper4k.

async article() -> newspaper.Article

Full newspaper.Article object with parsed content.

async soup() -> BeautifulSoup

BeautifulSoup object parsed from the HTML.

async seo() -> dict

SEO metadata parsed from the HTML. All keys are omitted if the corresponding tag is absent.

{
    "title": str,           # <title>
    "description": str,     # <meta name="description">
    "canonical": str,       # <link rel="canonical">
    "robots": {             # <meta name="robots"> — directives as keys
        "noindex": True,
        "nofollow": True,
    },
    "googlebot": { ... },   # <meta name="googlebot">, same shape as robots
    "og": {                 # <meta property="og:*"> keyed by suffix
        "title": str,
        "description": str,
        "image": str,
        "url": str,
    },
    "twitter": { ... },     # <meta name="twitter:*">, same pattern
    "hreflang": {           # <link rel="alternate" hreflang="..."> — values are lists
        "en-us": ["https://..."],
        "de": ["https://..."],
    }
}

@classmethod async scrape_many(urls, max_concurrent=15, logging=True, fail_fast=True, **kwargs) -> List[GhostScraper]

Scrape multiple URLs in parallel using a single shared browser instance.

Parameters:

• urls: List of URLs to scrape.
• max_concurrent: Max concurrent page loads. Default: 15.
• logging: Enable logging. Default: True.
• fail_fast: If True, any unhandled exception aborts the entire batch. If False, failed scrapers have scraper.error set, html() returns "", response_code() returns None. Default: True.
• on_progress: Progress callback (sync or async). Default: None.
• **kwargs: Forwarded to GhostScraper and PlaywrightScraper.

Returns: List[GhostScraper] in the same order as urls. Already-cached URLs are skipped.

Caching

• Cached fields: _html, _response_code, _response_headers, _redirect_chain.
• Cache key: slugified URL.
• Cache location: data/ghostscraper/ (configurable via ScraperDefaults.CACHE_DIRECTORY).
• DynamoDB cache replaces local cache when dynamodb_table is set. Requires AWS credentials.
• clear_cache=True forces a fresh fetch and overwrites the cache.

Loading Strategies

GhostScraper tries Playwright loading strategies in order, falling back on timeout:

1. load — waits for the load event. Works for most sites.
2. networkidle — waits until no network activity for 500ms. Better for JS-heavy pages. Uses network_idle_timeout.
3. domcontentloaded — waits only for HTML parsing. Fastest, least complete.

If all strategies fail, the attempt is retried up to max_retries times with exponential backoff (backoff_factor ** attempt seconds).

Override the chain via load_strategies:

scrapers = await GhostScraper.scrape_many(urls=urls, load_strategies=["domcontentloaded"])

# Or globally:
from ghostscraper import ScraperDefaults
ScraperDefaults.LOAD_STRATEGIES = ["domcontentloaded"]

Progress Callbacks

Pass on_progress to receive real-time events. Accepts sync and async callables.

scraper = GhostScraper(url="https://example.com", on_progress=lambda e: print(e["event"]))

Each event is a dict with event (str) and ts (Unix timestamp). Additional fields:

event	extra fields	notes
started	url	fired before fetch begins
browser_installing	browser	first-run only; sync callback only
browser_ready	browser	browser check passed
loading_strategy	url, strategy, attempt, max_retries, timeout	fired per strategy attempt
retry	url, attempt, max_retries + optional reason, status_code	only fires when another attempt follows
page_loaded	url, completed, total, status_code, scraper	fires on success or error status; scraper only in scrape_many; fires for cached URLs too
error	url, message	unhandled exception during fetch
batch_started	total, to_fetch, cached	scrape_many only
batch_done	total	scrape_many only

ScraperDefaults

Global defaults, modifiable at runtime before instantiation:

from ghostscraper import ScraperDefaults

ScraperDefaults.BROWSER_TYPE = "chromium"       # default browser
ScraperDefaults.HEADLESS = True
ScraperDefaults.LOAD_TIMEOUT = 20000            # ms
ScraperDefaults.NETWORK_IDLE_TIMEOUT = 3000     # ms
ScraperDefaults.LOAD_STRATEGIES = ["load", "networkidle", "domcontentloaded"]
ScraperDefaults.MAX_RETRIES = 3
ScraperDefaults.BACKOFF_FACTOR = 2.0
ScraperDefaults.MAX_CONCURRENT = 15
ScraperDefaults.CACHE_TTL = 999                 # days
ScraperDefaults.CACHE_DIRECTORY = "data/ghostscraper"
ScraperDefaults.DYNAMODB_TABLE = None
ScraperDefaults.LOGGING = True

PlaywrightScraper

Low-level browser automation used internally by GhostScraper. Use directly only if you need raw browser control.

Constructor

PlaywrightScraper(
    url: str = "",
    browser_type: Literal["chromium", "firefox", "webkit"] = "chromium",
    headless: bool = True,
    browser_args: Optional[Dict[str, Any]] = None,
    context_args: Optional[Dict[str, Any]] = None,
    max_retries: int = 3,
    backoff_factor: float = 2.0,
    network_idle_timeout: int = 3000,
    load_timeout: int = 20000,
    wait_for_selectors: Optional[List[str]] = None,
    logging: bool = True,
    on_progress: Optional[Callable] = None,
    load_strategies: Optional[List[str]] = None,
    no_retry_on: Optional[List[int]] = None
)

Methods

async fetch() -> Tuple[str, int, dict, list]

Fetch self.url. Returns (html, status_code, headers, redirect_chain).

async fetch_url(url: str) -> Tuple[str, int, dict, list]

Fetch a specific URL using the shared browser instance.

async fetch_many(urls: List[str], max_concurrent: int = 5) -> List[Tuple[str, int, dict, list]]

Fetch multiple URLs in parallel.

async fetch_and_close() -> Tuple[str, int, dict, list]

Fetch and immediately close the browser.

async close() -> None

Close browser and release Playwright resources.

async check_and_install_browser() -> bool

Check if the configured browser is installed; install it if not. Result is cached per process.

Supports async context manager (async with PlaywrightScraper(...) as browser).

Browser Installation Utilities

from ghostscraper import check_browser_installed, install_browser

installed = await check_browser_installed("chromium")  # bool
install_browser("chromium")                            # sync, runs playwright install

Usage Examples

Single URL

import asyncio
from ghostscraper import GhostScraper

async def main():
    scraper = GhostScraper(url="https://example.com")
    html = await scraper.html()
    text = await scraper.text()
    markdown = await scraper.markdown()
    code = await scraper.response_code()
    headers = await scraper.response_headers()
    seo = await scraper.seo()

asyncio.run(main())

Batch Scraping

scrapers = await GhostScraper.scrape_many(
    urls=["https://example.com", "https://python.org"],
    max_concurrent=5,
    ttl=7,
    load_strategies=["domcontentloaded"],
)
for scraper in scrapers:
    print(await scraper.text())

Partial Failure Handling

scrapers = await GhostScraper.scrape_many(urls=urls, fail_fast=False)
for s in scrapers:
    if s.error:
        print(f"FAILED {s.url}: {s.error}")
    else:
        print(f"OK {s.url}: {await s.response_code()}")

Redirect Chain

scraper = GhostScraper(url="https://example.com/redirect")
print(await scraper.final_url())
for hop in await scraper.redirect_chain():
    print(hop["status"], hop["url"])

Skip Retries on Terminal Status Codes

scraper = GhostScraper(url="https://example.com/missing", no_retry_on=[404, 410, 403])
print(await scraper.response_code())

DynamoDB Cache

scraper = GhostScraper(url="https://example.com", dynamodb_table="my-cache-table")
scrapers = await GhostScraper.scrape_many(urls=urls, dynamodb_table="my-cache-table")

Custom Browser Context

scraper = GhostScraper(
    url="https://example.com",
    context_args={"viewport": {"width": 1920, "height": 1080}, "user_agent": "..."},
    wait_for_selectors=["#content", ".product-list"],
)

Dependencies

• playwright
• beautifulsoup4
• html2text
• newspaper4k
• python-slugify
• logorator
• cacherator
• lxml_html_clean

License

MIT. Contributions welcome: https://github.com/Redundando/ghostscraper