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coach-scraper
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Scrape content into an asynchronous pipeline. (#8)

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Joshua Potter 2023-12-05 11:43:13 -07:00 committed by GitHub
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48
README.md
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@ -13,15 +13,15 @@ This is a simple web scraper for coaches listed on:
* [lichess.org](https://www.lichess.org/coach)
The program searches for coach usernames as well as specific information about
each of them (their profile, recent activity, and stats). The result will be
found in a newly created `data` directory with the following structure:
each of them (their profile, recent activity, and stats). Data is streamed into
a Postgres instance. Downloaded content is found in a newly created `data`
directory with the following structure:
```
data
└── <site>
│ ├── coaches
│ │ ├── <username>
│ │ │ ├── <username>.html
│ │ │ ├── export.json
│ │ │ └── ...
│ │ ├── ...
└── pages
@ -31,20 +31,6 @@ data
## Quickstart
If you have nix available, run:
```bash
$ nix run . -- --user-agent <your-email> -s <site> [-s <site> ...]
```
If not, ensure you have [poetry](https://python-poetry.org/) on your machine and
instead run the following:
```bash
$ poetry run python3 -m app -u <your-email> -s <site> [-s <site> ...]
```
After running (this may take several hours), a new CSV will be generated at
`data/export.csv` containing all scraped content from the specified `<site>`s.
## Database
Included in the development shell of this flake is a [Postgres](https://www.postgresql.org/)
client (version 15.5). Generate an empty Postgres cluster at `/db` by running
```bash
@ -64,34 +50,18 @@ To later shut the database down, run:
```bash
$ pg_ctl -D db stop
```
### Loading Data
To load all exported coach data into a local Postgres instance, use the provided
`sql/*.sql` files. First initialize the export schema/table:
Initialize the table that scraped content will be streamed into:
```bash
$ psql -h @scraper -f sql/init.sql
```
Next, dump exported data into the newly created table:
If you have nix available, you can now run the scraper via
```bash
$ psql -h @scraper -f sql/export.sql -v export="'$PWD/data/export.csv'"
$ nix run . -- ...
```
Re-running the `sql/export.sql` script will create a backup of the
`coach_scraper.export` table. It will then upsert the scraped data. You can view
all backups from the `psql` console like so:
```
postgres=# \dt coach_scraper.export*
```
### E2E
With the above section on loading files, we now have the individual components
necessary to scrape coach data from our chess website and dump the results into
the database in one fell swoop. Assuming our database is open with a socket
connection available at `@scraper`:
Otherwise, ensure you have [poetry](https://python-poetry.org/) on your machine
and instead run the following:
```bash
$ nix run . -- --user-agent <your-email> -s chesscom -s lichess
$ psql -h @scraper -f sql/init.sql -f sql/export.sql -v export="'$PWD/data/export.csv'"
$ poetry run python3 -m app ...
```
## Development

101
app/__main__.py
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@ -1,25 +1,52 @@
import argparse
import asyncio
import csv
import json
from typing import List
import aiohttp
import psycopg2
from app.chesscom import Exporter as ChesscomExporter
from app.chesscom import Scraper as ChesscomScraper
from app.lichess import Exporter as LichessExporter
from app.lichess import Scraper as LichessScraper
from app.repo import Site
from app.chesscom import Pipeline as ChesscomPipeline
from app.database import backup_database
from app.lichess import Pipeline as LichessPipeline
from app.pipeline import Site
# The number of parallel extraction jobs that are run at a time.
WORKER_COUNT = 10
async def run():
async def _process(site: Site, conn, session: aiohttp.ClientSession):
if site == Site.CHESSCOM:
await ChesscomPipeline(worker_count=WORKER_COUNT).process(conn, session)
elif site == Site.LICHESS:
await LichessPipeline(worker_count=WORKER_COUNT).process(conn, session)
else:
assert False, f"Encountered unknown site: {site}."
async def _entrypoint(conn, user_agent: str, sites: List[Site]):
"""Top-level entrypoint that dispatches a pipeline per requested site."""
async with aiohttp.ClientSession(
headers={"User-Agent": f"BoardWise coach-scraper ({user_agent})"}
) as session:
await asyncio.gather(*[_process(site, conn, session) for site in sites])
def main():
parser = argparse.ArgumentParser(
prog="coach-scraper",
description="Scraping/exporting of chess coaches.",
)
parser.add_argument("-u", "--user-agent", required=True)
# Database-related arguments.
parser.add_argument("--host", required=True)
parser.add_argument("--dbname", default="postgres")
parser.add_argument("--user", default="postgres")
parser.add_argument("--password", default="password")
parser.add_argument("--port", default=5432)
# Client session-related arguments.
parser.add_argument("--user-agent", required=True)
parser.add_argument(
"-s",
"--site",
required=True,
action="append",
@ -28,43 +55,29 @@ async def run():
Site.LICHESS.value,
],
)
args = parser.parse_args()
async with aiohttp.ClientSession(
headers={"User-Agent": f"BoardWise coach-scraper ({args.user_agent})"}
) as session:
with open("data/export.csv", "w") as f:
writer = csv.writer(f, quoting=csv.QUOTE_MINIMAL)
for site in set(args.site):
scraper, exporter_cls = None, None
if site == Site.CHESSCOM.value:
scraper = ChesscomScraper(session)
exporter_cls = ChesscomExporter
elif site == Site.LICHESS.value:
scraper = LichessScraper(session)
exporter_cls = LichessExporter
usernames = await scraper.scrape()
for username in usernames:
export = exporter_cls(username).export()
writer.writerow(
[
# This should match the order data is loaded in the
# sql/export.sql script.
export["site"],
export["username"],
export.get("name", ""),
export.get("image_url", ""),
export.get("rapid", ""),
export.get("blitz", ""),
export.get("bullet", ""),
]
conn = None
try:
conn = psycopg2.connect(
dbname=args.dbname,
user=args.user,
host=args.host,
password=args.password,
port=args.port,
)
def main():
asyncio.run(run())
backup_database(conn)
asyncio.run(
_entrypoint(
conn=conn,
user_agent=args.user_agent,
sites=list(map(Site, set(args.site))),
)
)
finally:
if conn:
conn.close()
if __name__ == "__main__":

201
app/chesscom.py
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@ -7,9 +7,10 @@ from typing import List, Union
import aiohttp
from bs4 import BeautifulSoup, SoupStrainer
from app.exporter import BaseExporter
from app.repo import AnsiColor, Site
from app.scraper import BaseScraper
from app.pipeline import Extractor as BaseExtractor
from app.pipeline import Fetcher as BaseFetcher
from app.pipeline import Pipeline as BasePipeline
from app.pipeline import Site
# The number of coach listing pages we will at most iterate through. This number
# was determined by going to chess.com/coaches?sortBy=alphabetical&page=1 and
@ -20,78 +21,30 @@ MAX_PAGES = 64
SLEEP_SECS = 3
class Scraper(BaseScraper):
class Fetcher(BaseFetcher):
def __init__(self, session: aiohttp.ClientSession):
super().__init__(site=Site.CHESSCOM.value, session=session)
super().__init__(site=Site.CHESSCOM, session=session)
async def download_usernames(self) -> List[str]:
"""Scan through chess.com/coaches for all coaches' usernames.
async def scrape_usernames(self, page_no: int) -> List[str]:
if page_no > MAX_PAGES:
return []
print(f"{self.site.value}: Scraping page {page_no}/{MAX_PAGES}")
@return
The complete list of scraped usernames across every coach listing
page.
"""
usernames = []
for page_no in range(1, MAX_PAGES + 1):
filepath = self.path_page_file(page_no)
try:
with open(filepath, "r") as f:
self.log(
[
(AnsiColor.INFO, "[INFO]"),
(None, ": Reading file "),
(AnsiColor.DATA, filepath),
]
)
usernames.extend([line.strip() for line in f.readlines()])
return [line.strip() for line in f.readlines()]
except FileNotFoundError:
page_usernames = await self._scrape_page(page_no)
if not page_usernames:
self.log(
[
(AnsiColor.ERROR, "[ERROR]"),
(None, ": Could not scrape page "),
(AnsiColor.DATA, str(page_no)),
]
)
continue
with open(filepath, "w") as f:
for username in page_usernames:
f.write(f"{username}\n")
usernames.extend(page_usernames)
self.log(
[
(AnsiColor.INFO, "[INFO]"),
(None, ": Downloaded page "),
(AnsiColor.DATA, filepath),
]
)
pass
if self.has_made_request:
await asyncio.sleep(SLEEP_SECS)
return usernames
async def _scrape_page(self, page_no: int) -> List[str]:
"""Scan through chess.com/coaches/?page=<n> for all coaches' usernames.
@param page_no
The page consisting of at most 25 coaches (at the time of writing)
whose usernames are to be scraped.
@return
The list of scraped usernames on the specified coach listing page.
"""
url = f"https://www.chess.com/coaches?sortBy=alphabetical&page={page_no}"
response, status_code = await self.request(url)
response, status_code = await self.fetch(url)
if response is None:
self.log(
[
(AnsiColor.ERROR, "[ERROR]"),
(None, ": Received status "),
(AnsiColor.DATA, f"{status_code} "),
(None, "when downloading page "),
(AnsiColor.DATA, str(page_no)),
]
)
return
return None # Skips this page.
usernames = []
soup = BeautifulSoup(response, "lxml")
@ -101,92 +54,67 @@ class Scraper(BaseScraper):
username = href[len("https://www.chess.com/member/") :]
usernames.append(username)
# Cache results.
with open(filepath, "w") as f:
for username in usernames:
f.write(f"{username}\n")
return usernames
async def download_profile(self, username: str):
"""For each coach, download coach-specific data.
This sends three parallel requests for:
* the coach's profile,
* the coach's recent activity,
* the coach's stats.
@param username
The coach username corresponding to the downloaded files.
"""
used_network = await asyncio.gather(
self._download_profile_file(
url=f"https://www.chess.com/member/{username}",
username=username,
filename=self.path_coach_file(username, f"{username}.html"),
async def download_user_files(self, username: str) -> None:
maybe_download = [
(
f"https://www.chess.com/member/{username}",
self.path_coach_file(username, f"{username}.html"),
),
self._download_profile_file(
url=f"https://www.chess.com/callback/member/activity/{username}?page=1",
username=username,
filename=self.path_coach_file(username, "activity.json"),
(
f"https://www.chess.com/callback/member/activity/{username}?page=1",
self.path_coach_file(username, "activity.json"),
),
self._download_profile_file(
url=f"https://www.chess.com/callback/member/stats/{username}",
username=username,
filename=self.path_coach_file(username, "stats.json"),
(
f"https://www.chess.com/callback/member/stats/{username}",
self.path_coach_file(username, "stats.json"),
),
)
if any(used_network):
self.log(
[
(AnsiColor.INFO, "[INFO]"),
(None, ": Downloaded data for coach "),
(AnsiColor.DATA, username),
]
)
to_download = []
for d_url, d_filename in maybe_download:
if os.path.isfile(d_filename):
continue
to_download.append((d_url, d_filename))
if not to_download:
return
if self.has_made_request:
await asyncio.sleep(SLEEP_SECS)
else:
self.log(
[
(AnsiColor.INFO, "[INFO]"),
(None, ": Skipping download for coach "),
(AnsiColor.DATA, username),
]
await asyncio.gather(
*[self._download_file(url=d[0], filename=d[1]) for d in to_download]
)
async def _download_profile_file(self, url: str, username: str, filename: str):
"""Writes the contents of url into the specified file.
@param url
The URL of the file to download.
@param username
The coach username corresponding to the downloaded file.
@param filename
The output file to write the downloaded content to.
@return:
True if we make a network request. False otherwise.
"""
if os.path.isfile(filename):
return False
response, _unused_status = await self.request(url)
async def _download_file(self, url: str, filename: str) -> None:
response, _unused_status = await self.fetch(url)
if response is not None:
with open(filename, "w") as f:
f.write(response)
return True
def _profile_filter(elem, attrs):
"""Includes only relevant segments of the `{username}.html` file."""
if "profile-header-info" in attrs.get("class", ""):
return True
if "profile-card-info" in attrs.get("class", ""):
return True
class Exporter(BaseExporter):
def __init__(self, username: str):
super().__init__(site=Site.CHESSCOM.value, username=username)
class Extractor(BaseExtractor):
def __init__(self, fetcher: Fetcher, username: str):
super().__init__(fetcher, username)
self.profile_soup = None
try:
with open(self.path_coach_file(username, f"{username}.html"), "r") as f:
filename = self.fetcher.path_coach_file(username, f"{username}.html")
with open(filename, "r") as f:
self.profile_soup = BeautifulSoup(
f.read(), "lxml", parse_only=SoupStrainer(_profile_filter)
)
@ -195,21 +123,22 @@ class Exporter(BaseExporter):
self.stats_json = {}
try:
with open(self.path_coach_file(username, "stats.json"), "r") as f:
filename = self.fetcher.path_coach_file(username, "stats.json")
with open(filename, "r") as f:
for s in json.load(f).get("stats", []):
if "key" in s and "stats" in s:
self.stats_json[s["key"]] = s["stats"]
except FileNotFoundError:
pass
def export_name(self) -> Union[str, None]:
def get_name(self) -> Union[str, None]:
try:
name = self.profile_soup.find("div", class_="profile-card-name")
return name.get_text().strip()
except AttributeError:
return None
def export_image_url(self) -> Union[str, None]:
def get_image_url(self) -> Union[str, None]:
try:
div = self.profile_soup.find("div", class_="profile-header-avatar")
src = div.find("img").get("src", "")
@ -218,11 +147,19 @@ class Exporter(BaseExporter):
except AttributeError:
return None
def export_rapid(self) -> Union[int, None]:
def get_rapid(self) -> Union[int, None]:
return self.stats_json.get("rapid", {}).get("rating")
def export_blitz(self) -> Union[int, None]:
def get_blitz(self) -> Union[int, None]:
return self.stats_json.get("lightning", {}).get("rating")
def export_bullet(self) -> Union[int, None]:
def get_bullet(self) -> Union[int, None]:
return self.stats_json.get("bullet", {}).get("rating")
class Pipeline(BasePipeline):
def get_fetcher(self, session: aiohttp.ClientSession):
return Fetcher(session)
def get_extractor(self, fetcher: Fetcher, username: str):
return Extractor(fetcher, username)

113
app/database.py Normal file
View File

@ -0,0 +1,113 @@
import sys
from datetime import datetime
from typing_extensions import TypedDict
SCHEMA_NAME = "coach_scraper"
TABLE_NAME = "export"
class Row(TypedDict, total=False):
"""Representation of a row of the export table.
The (site, username) make up a unique key for each coach.
"""
# Website the given coach was sourced from.
site: str
# Username used on the source site.
username: str
# Real name.
name: str
# Profile image used on the source site.
image_url: str
# Rapid rating relative to the site they were sourced from.
rapid: int
# Blitz rating relative to the site they were sourced from.
blitz: int
# Bullet rating relative to the site they were sourced from.
bullet: int
def backup_database(conn):
"""Creates a backup of the export table.
Simply copies the table at time of invocation into another table with a
`_%t` suffix, where %t denotes the number of seconds since the Unix epoch.
"""
cursor = None
try:
cursor = conn.cursor()
cursor.execute(
f"""
SELECT 1
FROM information_schema.tables
WHERE table_schema = '{SCHEMA_NAME}'
AND table_name = '{TABLE_NAME}';
"""
)
result = cursor.fetchone()
if result is None:
print(f"Missing `{SCHEMA_NAME}.{TABLE_NAME}` table.", file=sys.stderr)
sys.exit(1)
timestamp = int((datetime.now() - datetime(1970, 1, 1)).total_seconds())
cursor.execute(
f"""
CREATE TABLE {SCHEMA_NAME}.{TABLE_NAME}_{timestamp}
AS TABLE {SCHEMA_NAME}.{TABLE_NAME}
"""
)
finally:
if cursor:
cursor.close()
def upsert_row(conn, row: Row):
"""Upsert the specified `Row` into the database table."""
cursor = None
try:
cursor = conn.cursor()
cursor.execute(
f"""
INSERT INTO {SCHEMA_NAME}.{TABLE_NAME}
( site
, username
, name
, image_url
, rapid
, blitz
, bullet
)
VALUES
( %s
, %s
, %s
, %s
, %s
, %s
, %s
)
ON CONFLICT
(site, username)
DO UPDATE SET
name = EXCLUDED.name,
image_url = EXCLUDED.image_url,
rapid = EXCLUDED.rapid,
blitz = EXCLUDED.blitz,
bullet = EXCLUDED.bullet;
""",
[
row["site"].value,
row["username"],
row.get("name"),
row.get("image_url"),
row.get("rapid"),
row.get("blitz"),
row.get("bullet"),
],
)
conn.commit()
finally:
cursor.close()

69
app/exporter.py
View File

@ -1,69 +0,0 @@
from typing import Any, Union
from typing_extensions import TypedDict
from app.repo import AnsiColor, Repo
class Export(TypedDict, total=False):
# The (site, username) make up a unique key for each coach.
site: str
username: str
# The coach's real name.
name: str
# The profile image used on the source site.
image_url: str
# The coach's rapid rating relative to the site they were sourced from.
rapid: int
# The coach's blitz rating relative to the site they were sourced from.
blitz: int
# The coach's bullet rating relative to the site they were sourced from.
bullet: int
def _insert(export: Export, key: str, value: Any):
if value is not None:
export[key] = value
class BaseExporter(Repo):
def __init__(self, site: str, username: str):
super().__init__(site)
self.username = username
def export_name(self) -> Union[str, None]:
raise NotImplementedError()
def export_image_url(self) -> Union[str, None]:
raise NotImplementedError()
def export_rapid(self) -> Union[int, None]:
raise NotImplementedError()
def export_blitz(self) -> Union[int, None]:
raise NotImplementedError()
def export_bullet(self) -> Union[int, None]:
raise NotImplementedError()
def export(self) -> Export:
"""Transform coach-specific data into uniform format."""
export: Export = {}
_insert(export, "site", self.site)
_insert(export, "username", self.username)
_insert(export, "name", self.export_name())
_insert(export, "image_url", self.export_image_url())
_insert(export, "rapid", self.export_rapid())
_insert(export, "blitz", self.export_blitz())
_insert(export, "bullet", self.export_bullet())
self.log(
[
(AnsiColor.INFO, "[INFO]"),
(None, ": Exported "),
(AnsiColor.DATA, self.username),
]
)
return export

193
app/lichess.py
View File

@ -6,9 +6,10 @@ from typing import List, Union
import aiohttp
from bs4 import BeautifulSoup, SoupStrainer
from app.exporter import BaseExporter
from app.repo import AnsiColor, Site
from app.scraper import BaseScraper
from app.pipeline import Extractor as BaseExtractor
from app.pipeline import Fetcher as BaseFetcher
from app.pipeline import Pipeline as BasePipeline
from app.pipeline import Site
# The number of pages we will at most iterate through. This number was
# determined by going to https://lichess.org/coach/all/all/alphabetical
@ -19,79 +20,30 @@ MAX_PAGES = 162
SLEEP_SECS = 5
class Scraper(BaseScraper):
class Fetcher(BaseFetcher):
def __init__(self, session: aiohttp.ClientSession):
super().__init__(site=Site.LICHESS.value, session=session)
super().__init__(site=Site.LICHESS, session=session)
async def download_usernames(self) -> List[str]:
"""Scan through lichess.org/coach for all coaches' usernames.
async def scrape_usernames(self, page_no: int) -> List[str]:
if page_no > MAX_PAGES:
return []
print(f"{self.site.value}: Scraping page {page_no}/{MAX_PAGES}")
@return
The complete list of scraped usernames across every coach listing
page.
"""
usernames = []
for page_no in range(1, MAX_PAGES + 1):
filepath = self.path_page_file(page_no)
try:
with open(filepath, "r") as f:
self.log(
[
(AnsiColor.INFO, "[INFO]"),
(None, ": Reading file "),
(AnsiColor.DATA, filepath),
]
)
usernames.extend([line.strip() for line in f.readlines()])
return [line.strip() for line in f.readlines()]
except FileNotFoundError:
page_usernames = await self._scrape_page(page_no)
if not page_usernames:
self.log(
[
(AnsiColor.ERROR, "[ERROR]"),
(None, ": Could not scrape page "),
(AnsiColor.DATA, str(page_no)),
]
)
continue
with open(filepath, "w") as f:
for username in page_usernames:
f.write(f"{username}\n")
usernames.extend(page_usernames)
self.log(
[
(AnsiColor.INFO, "[INFO]"),
(None, ": Downloaded page "),
(AnsiColor.DATA, filepath),
]
)
pass
if self.has_made_request:
await asyncio.sleep(SLEEP_SECS)
return usernames
async def _scrape_page(self, page_no: int):
"""Scan through lichess.org/coach/.../?page=<n> for all coaches'
usernames.
@param page_no
The page consisting of at most 10 coaches (at the time of writing)
whose usernames are to be scraped.
@return
The list of scraped usernames on the specified coach listing page.
"""
url = f"https://lichess.org/coach/all/all/alphabetical?page={page_no}"
response, status_code = await self.request(url)
response, status_code = await self.fetch(url)
if response is None:
self.log(
[
(AnsiColor.ERROR, "[ERROR]"),
(None, ": Received status "),
(AnsiColor.DATA, f"{status_code} "),
(None, "when downloading page "),
(AnsiColor.DATA, str(page_no)),
]
)
return
return None # Skips this page.
usernames = []
soup = BeautifulSoup(response, "lxml")
@ -103,87 +55,67 @@ class Scraper(BaseScraper):
username = href[len("/coach/") :]
usernames.append(username)
with open(filepath, "w") as f:
for username in usernames:
f.write(f"{username}\n")
return usernames
async def download_profile(self, username: str):
"""For each coach, download coach-specific data.
@param username
The coach username corresponding to the downloaded files.
"""
used_network1 = await self._download_profile_file(
url=f"https://lichess.org/coach/{username}",
username=username,
filename=self.path_coach_file(username, f"{username}.html"),
)
used_network2 = await self._download_profile_file(
url=f"https://lichess.org/@/{username}",
username=username,
filename=self.path_coach_file(username, "stats.html"),
)
if any([used_network1, used_network2]):
self.log(
[
(AnsiColor.INFO, "[INFO]"),
(None, ": Downloaded data for coach "),
(AnsiColor.DATA, username),
async def download_user_files(self, username: str) -> None:
maybe_download = [
(
f"https://lichess.org/coach/{username}",
self.path_coach_file(username, f"{username}.html"),
),
(
f"https://lichess.org/@/{username}",
self.path_coach_file(username, "stats.html"),
),
]
)
to_download = []
for d_url, d_filename in maybe_download:
if os.path.isfile(d_filename):
continue
to_download.append((d_url, d_filename))
if not to_download:
return
if self.has_made_request:
await asyncio.sleep(SLEEP_SECS)
else:
self.log(
[
(AnsiColor.INFO, "[INFO]"),
(None, ": Skipping download for coach "),
(AnsiColor.DATA, username),
]
await asyncio.gather(
*[self._download_file(url=d[0], filename=d[1]) for d in to_download]
)
async def _download_profile_file(self, url: str, username: str, filename: str):
"""Writes the contents of url into the specified file.
@param url
The URL of the file to download.
@param username
The coach username corresponding to the downloaded file.
@param filename
The output file to write the downloaded content to.
@return:
True if we make a network request. False otherwise.
"""
if os.path.isfile(filename):
return False
response, _unused_status = await self.request(url)
async def _download_file(self, url: str, filename: str) -> None:
response, _unused_status = await self.fetch(url)
if response is not None:
with open(filename, "w") as f:
f.write(response)
return True
def _profile_filter(elem, attrs):
"""Includes only relevant segments of the `{username}.html` file."""
if "coach-widget" in attrs.get("class", ""):
return True
def _stats_filter(elem, attrs):
"""Includes only relevant segments of the `stats.html` file."""
if "profile-side" in attrs.get("class", ""):
return True
if "sub-ratings" in attrs.get("class", ""):
return True
class Exporter(BaseExporter):
def __init__(self, username: str):
super().__init__(site=Site.LICHESS.value, username=username)
class Extractor(BaseExtractor):
def __init__(self, fetcher: Fetcher, username: str):
super().__init__(fetcher, username)
self.profile_soup = None
try:
with open(self.path_coach_file(username, f"{username}.html"), "r") as f:
filename = self.fetcher.path_coach_file(username, f"{username}.html")
with open(filename, "r") as f:
self.profile_soup = BeautifulSoup(
f.read(), "lxml", parse_only=SoupStrainer(_profile_filter)
)
@ -192,14 +124,15 @@ class Exporter(BaseExporter):
self.stats_soup = None
try:
with open(self.path_coach_file(username, "stats.html"), "r") as f:
filename = self.fetcher.path_coach_file(username, "stats.html")
with open(filename, "r") as f:
self.stats_soup = BeautifulSoup(
f.read(), "lxml", parse_only=SoupStrainer(_stats_filter)
)
except FileNotFoundError:
pass
def export_name(self) -> Union[str, None]:
def get_name(self) -> Union[str, None]:
try:
profile_side = self.stats_soup.find("div", class_="profile-side")
user_infos = profile_side.find("div", class_="user-infos")
@ -208,7 +141,7 @@ class Exporter(BaseExporter):
except AttributeError:
return None
def export_image_url(self) -> Union[str, None]:
def get_image_url(self) -> Union[str, None]:
try:
picture = self.profile_soup.find("img", class_="picture")
src = picture.get("src", "")
@ -217,13 +150,13 @@ class Exporter(BaseExporter):
except AttributeError:
return None
def export_rapid(self) -> Union[int, None]:
def get_rapid(self) -> Union[int, None]:
return self._find_rating("rapid")
def export_blitz(self) -> Union[int, None]:
def get_blitz(self) -> Union[int, None]:
return self._find_rating("blitz")
def export_bullet(self) -> Union[int, None]:
def get_bullet(self) -> Union[int, None]:
return self._find_rating("bullet")
def _find_rating(self, name) -> Union[int, None]:
@ -237,3 +170,11 @@ class Exporter(BaseExporter):
return int(value)
except (AttributeError, ValueError):
return None
class Pipeline(BasePipeline):
def get_fetcher(self, session: aiohttp.ClientSession):
return Fetcher(session)
def get_extractor(self, fetcher: Fetcher, username: str):
return Extractor(fetcher, username)

192
app/pipeline.py Normal file
View File

@ -0,0 +1,192 @@
import asyncio
import enum
import os.path
from typing import Any, List, Tuple, Union
import aiohttp
from app.database import Row, upsert_row
class Site(enum.Enum):
CHESSCOM = "chesscom"
LICHESS = "lichess"
class Fetcher:
"""Download and cache files from the specified site.
Each implementation of this class is responsible for rate-limiting requests.
"""
def __init__(self, site: Site, session: aiohttp.ClientSession):
self.site = site
self.session = session
self.has_made_request = False
os.makedirs(self.path_coaches_dir(), exist_ok=True)
os.makedirs(self.path_pages_dir(), exist_ok=True)
def path_site_dir(self):
return os.path.join("data", self.site.value)
def path_site_file(self, filename: str):
return os.path.join(self.path_site_dir(), filename)
def path_coaches_dir(self):
return os.path.join(self.path_site_dir(), "coaches")
def path_coach_dir(self, username: str):
return os.path.join(self.path_coaches_dir(), username)
def path_coach_file(self, username: str, filename: str):
return os.path.join(self.path_coach_dir(username), filename)
def path_pages_dir(self):
return os.path.join(self.path_site_dir(), "pages")
def path_page_file(self, page_no: int):
return os.path.join(self.path_pages_dir(), f"{page_no}.txt")
async def fetch(self, url: str) -> Tuple[Union[str, None], int]:
"""Make network requests using the internal session.
@param url
The URL to make a GET request to.
@return
Tuple containing the response body (if the request was successful)
and status code.
"""
self.has_made_request = True
async with self.session.get(url) as response:
if response.status == 200:
return await response.text(), 200
return None, response.status
async def scrape_usernames(self, page_no: int) -> Union[List[str], None]:
"""Source the specified site for all coach usernames.
All pages should be downloaded at `self.path_page_file()`. Any cached
file should be a plain `.txt` file containing one username per-line.
@param page_no:
How many times this function was invoked (1-indexed). Useful to
paginate responses back out to the `Pipeline` this `Downloader`
is embedded in.
@return:
A list of usernames. Should return an empty list if no more
usernames are found. Can return `None` to indicate the specified
page should be skipped.
"""
raise NotImplementedError()
async def _download_user_files(self, username: str) -> None:
os.makedirs(self.path_coach_dir(username), exist_ok=True)
await self.download_user_files(username)
async def download_user_files(self, username: str) -> None:
"""Source the specified site for all user-specific files.
What files are downloaded depends on the `Downloader` implementation.
All files should be downloaded at `self.path_coach_file()`.
"""
raise NotImplementedError()
def _insert(row: Row, key: str, value: Any):
if value is not None:
row[key] = value
class Extractor:
def __init__(self, fetcher: Fetcher, username: str):
self.fetcher = fetcher
self.username = username
def get_name(self) -> Union[str, None]:
raise NotImplementedError()
def get_image_url(self) -> Union[str, None]:
raise NotImplementedError()
def get_rapid(self) -> Union[int, None]:
raise NotImplementedError()
def get_blitz(self) -> Union[int, None]:
raise NotImplementedError()
def get_bullet(self) -> Union[int, None]:
raise NotImplementedError()
def extract(self) -> Row:
"""Extract a table row from the coach-specific downloads."""
row: Row = {}
_insert(row, "site", self.fetcher.site)
_insert(row, "username", self.username)
_insert(row, "name", self.get_name())
_insert(row, "image_url", self.get_image_url())
_insert(row, "rapid", self.get_rapid())
_insert(row, "blitz", self.get_blitz())
_insert(row, "bullet", self.get_bullet())
return row
async def task_worker(name, queue):
while True:
conn, extractor = await queue.get()
upsert_row(conn, extractor.extract())
queue.task_done()
class Pipeline:
"""Site specific download and extraction pipeline.
Performs downloads serially but processes data extraction from downloaded
files concurrently.
"""
def __init__(self, worker_count):
self.worker_count = worker_count
def get_fetcher(self, session: aiohttp.ClientSession) -> Fetcher:
raise NotImplementedError()
def get_extractor(self, fetcher: Fetcher, username: str) -> Extractor:
raise NotImplementedError()
async def process(self, conn, session: aiohttp.ClientSession):
fetcher = self.get_fetcher(session)
queue = asyncio.Queue()
# Create a batch of workers to process the jobs put into the queue.
workers = []
for i in range(self.worker_count):
worker = asyncio.create_task(task_worker(f"worker-{i}", queue))
workers.append(worker)
# Begin downloading all coach usernames and files. The workers will
# run concurrently to extract all the relvant information and write
page_no = 1
usernames = [None]
while len(usernames):
usernames = await fetcher.scrape_usernames(page_no)
page_no += 1
if usernames is None:
usernames = [None]
continue
for username in usernames:
await fetcher._download_user_files(username)
extractor = self.get_extractor(fetcher, username)
queue.put_nowait((conn, extractor))
# Wait until the queue is fully processed.
await queue.join()
# We can now turn down the workers.
for worker in workers:
worker.cancel()
await asyncio.gather(*workers, return_exceptions=True)

60
app/repo.py
View File

@ -1,60 +0,0 @@
import enum
import os
from typing import List, Tuple, Union
class AnsiColor(enum.Enum):
ERROR = "\033[0;31m"
INFO = "\033[0;34m"
DATA = "\033[0;36m"
RESET = "\033[0m"
class Site(enum.Enum):
CHESSCOM = "chesscom"
LICHESS = "lichess"
class Repo:
"""Shared filesystem-related functionality."""
def __init__(self, site: str):
self.site = site
def path_site_dir(self):
"""The root directory for all site-related files."""
return os.path.join("data", self.site)
def path_site_file(self, filename: str):
"""Path to a top-level site-related file."""
return os.path.join(self.path_site_dir(), filename)
def path_coaches_dir(self):
"""The root directory for all coach-related downloads."""
return os.path.join(self.path_site_dir(), "coaches")
def path_coach_dir(self, username: str):
"""The root directory for a specific coach's downloads."""
return os.path.join(self.path_coaches_dir(), username)
def path_coach_file(self, username: str, filename: str):
"""Path to a coach-specific file download."""
return os.path.join(self.path_coach_dir(username), filename)
def path_pages_dir(self):
"""The root directory for all username listing files."""
return os.path.join(self.path_site_dir(), "pages")
def path_page_file(self, page_no: int):
"""The root directory for usernames scraped from a single page."""
return os.path.join(self.path_pages_dir(), f"{page_no}.txt")
def log(self, msgs: List[Tuple[Union[AnsiColor, None], str]]):
transformed = []
for k, v in msgs:
if k is None:
transformed.append(v)
else:
transformed.append(f"{k.value}{v}{AnsiColor.RESET.value}")
print("".join(transformed))

59
app/scraper.py
View File

@ -1,59 +0,0 @@
import os
from typing import List, Tuple, Union
import aiohttp
from app.repo import Repo
class BaseScraper(Repo):
def __init__(self, site: str, session: aiohttp.ClientSession):
"""Initialize a new web scraper.
@param site:
The site we are making requests out to.
@param session:
The `aiohttp.ClientSession` context our requests are made from.
"""
super().__init__(site)
self.session = session
async def download_usernames(self) -> List[str]:
"""Collect all coach usernames from the specified site."""
raise NotImplementedError()
async def download_profile(self, username: str):
"""For each coach, download coach-specific data."""
raise NotImplementedError()
async def request(self, url: str) -> Tuple[Union[str, None], int]:
"""Make network requests using the internal session.
@param url
The URL to make a GET request to.
@return
Tuple containing the response body (if the request was successful)
and status code.
"""
async with self.session.get(url) as response:
if response.status == 200:
return await response.text(), 200
return None, response.status
async def scrape(self) -> List[str]:
"""Main entrypoint for scraping and exporting downloaded content.
A `Scraper` is structured to operates in the following stages:
1. Collect all coach usernames from the specified site.
2. For each coach, download coach-specific data.
3. Transform this data and export into uniform format.
"""
os.makedirs(self.path_coaches_dir(), exist_ok=True)
os.makedirs(self.path_pages_dir(), exist_ok=True)
usernames = await self.download_usernames()
for username in usernames:
os.makedirs(self.path_coach_dir(username), exist_ok=True)
await self.download_profile(username)
return usernames

24
poetry.lock generated
View File

@ -416,6 +416,28 @@ files = [
{file = "multidict-6.0.4.tar.gz", hash = "sha256:3666906492efb76453c0e7b97f2cf459b0682e7402c0489a95484965dbc1da49"},
]
[[package]]
name = "psycopg2"
version = "2.9.9"
description = "psycopg2 - Python-PostgreSQL Database Adapter"
optional = false
python-versions = ">=3.7"
files = [
{file = "psycopg2-2.9.9-cp310-cp310-win32.whl", hash = "sha256:38a8dcc6856f569068b47de286b472b7c473ac7977243593a288ebce0dc89516"},
{file = "psycopg2-2.9.9-cp310-cp310-win_amd64.whl", hash = "sha256:426f9f29bde126913a20a96ff8ce7d73fd8a216cfb323b1f04da402d452853c3"},
{file = "psycopg2-2.9.9-cp311-cp311-win32.whl", hash = "sha256:ade01303ccf7ae12c356a5e10911c9e1c51136003a9a1d92f7aa9d010fb98372"},
{file = "psycopg2-2.9.9-cp311-cp311-win_amd64.whl", hash = "sha256:121081ea2e76729acfb0673ff33755e8703d45e926e416cb59bae3a86c6a4981"},
{file = "psycopg2-2.9.9-cp312-cp312-win32.whl", hash = "sha256:d735786acc7dd25815e89cc4ad529a43af779db2e25aa7c626de864127e5a024"},
{file = "psycopg2-2.9.9-cp312-cp312-win_amd64.whl", hash = "sha256:a7653d00b732afb6fc597e29c50ad28087dcb4fbfb28e86092277a559ae4e693"},
{file = "psycopg2-2.9.9-cp37-cp37m-win32.whl", hash = "sha256:5e0d98cade4f0e0304d7d6f25bbfbc5bd186e07b38eac65379309c4ca3193efa"},
{file = "psycopg2-2.9.9-cp37-cp37m-win_amd64.whl", hash = "sha256:7e2dacf8b009a1c1e843b5213a87f7c544b2b042476ed7755be813eaf4e8347a"},
{file = "psycopg2-2.9.9-cp38-cp38-win32.whl", hash = "sha256:ff432630e510709564c01dafdbe996cb552e0b9f3f065eb89bdce5bd31fabf4c"},
{file = "psycopg2-2.9.9-cp38-cp38-win_amd64.whl", hash = "sha256:bac58c024c9922c23550af2a581998624d6e02350f4ae9c5f0bc642c633a2d5e"},
{file = "psycopg2-2.9.9-cp39-cp39-win32.whl", hash = "sha256:c92811b2d4c9b6ea0285942b2e7cac98a59e166d59c588fe5cfe1eda58e72d59"},
{file = "psycopg2-2.9.9-cp39-cp39-win_amd64.whl", hash = "sha256:de80739447af31525feddeb8effd640782cf5998e1a4e9192ebdf829717e3913"},
{file = "psycopg2-2.9.9.tar.gz", hash = "sha256:d1454bde93fb1e224166811694d600e746430c006fbb031ea06ecc2ea41bf156"},
]
[[package]]
name = "soupsieve"
version = "2.5"
@ -569,4 +591,4 @@ multidict = ">=4.0"
[metadata]
lock-version = "2.0"
python-versions = "^3.11"
content-hash = "c8c702814a8cfd97f393121a82216a92e7b5ab7fccc01e547ffc3c492610c988"
content-hash = "9e4078c4f5eeffbc90b895528738c457dadd671a784ab8c411a5c3fe91925e34"

1
pyproject.toml
View File

@ -10,6 +10,7 @@ python = "^3.11"
beautifulsoup4 = "^4.12.2"
aiohttp = "^3.8.6"
lxml = "^4.9.3"
psycopg2 = "^2.9.9"
[tool.poetry.group.dev.dependencies]
types-beautifulsoup4 = "^4.12.0.7"

53
sql/export.sql
View File

@ -1,53 +0,0 @@
DO $$
BEGIN
EXECUTE format(
'CREATE TABLE coach_scraper.export_%s AS TABLE coach_scraper.export',
TRUNC(EXTRACT(EPOCH FROM CURRENT_TIMESTAMP), 0)
);
END;
$$ LANGUAGE plpgsql;
-- This should match the order data is written in the app/__main__.py
-- script.
CREATE TEMPORARY TABLE pg_temp.coach_scraper_export
( site TEXT
, username TEXT
, name TEXT
, image_url TEXT
, rapid TEXT
, blitz TEXT
, bullet TEXT
);
SELECT format(
$$COPY pg_temp.coach_scraper_export FROM %L WITH (FORMAT CSV)$$,
:export
) \gexec
INSERT INTO coach_scraper.export
( site
, username
, name
, image_url
, rapid
, blitz
, bullet
)
SELECT
site,
username,
name,
image_url,
rapid::INT,
blitz::INT,
bullet::INT
FROM
pg_temp.coach_scraper_export
ON CONFLICT
(site, username)
DO UPDATE SET
name = EXCLUDED.name,
image_url = EXCLUDED.image_url,
rapid = EXCLUDED.rapid,
blitz = EXCLUDED.blitz,
bullet = EXCLUDED.bullet;