Differential D8298 Diff 30085 swh/lister/golang/lister.py

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swh/lister/golang/lister.py

# Copyright (C) 2022 The Software Heritage developers		# Copyright (C) 2022 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution		# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version		# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information		# See top-level LICENSE file for more information

		from dataclasses import dataclass
from datetime import datetime		from datetime import datetime
import json		import json
import logging		import logging
from typing import Any, Dict, Iterator, List, Optional, Tuple		from typing import Any, Dict, Iterator, List, Optional, Tuple

import iso8601		import iso8601
import requests		import requests
from tenacity import before_sleep_log		from tenacity import before_sleep_log

from swh.lister.utils import retry_policy_generic, throttling_retry		from swh.lister.utils import retry_policy_generic, throttling_retry
from swh.scheduler.interface import SchedulerInterface		from swh.scheduler.interface import SchedulerInterface
from swh.scheduler.model import ListedOrigin		from swh.scheduler.model import ListedOrigin

from .. import USER_AGENT		from .. import USER_AGENT
from ..pattern import CredentialsType, StatelessLister		from ..pattern import CredentialsType, Lister

logger = logging.getLogger(__name__)		logger = logging.getLogger(__name__)


		@dataclass
		class GolangStateType:
		last_seen: Optional[datetime] = None
		"""Last timestamp of a package version we have saved.
		Used as a starting point for an incremental listing."""


GolangPageType = List[Dict[str, Any]]		GolangPageType = List[Dict[str, Any]]


class GolangLister(StatelessLister[GolangPageType]):		class GolangLister(Lister[GolangStateType, GolangPageType]):
"""		"""
List all Golang modules and send associated origins to scheduler.		List all Golang modules and send associated origins to scheduler.

The lister queries the Golang module index, whose documentation can be found		The lister queries the Golang module index, whose documentation can be found
at https://index.golang.org		at https://index.golang.org
"""		"""

GOLANG_MODULES_INDEX_URL = "https://index.golang.org/index"		GOLANG_MODULES_INDEX_URL = "https://index.golang.org/index"
# `limit` seems to be... limited to 2000.		# `limit` seems to be... limited to 2000.
GOLANG_MODULES_INDEX_LIMIT = 2000		GOLANG_MODULES_INDEX_LIMIT = 2000
LISTER_NAME = "Golang"		LISTER_NAME = "Golang"

def __init__(		def __init__(
self, scheduler: SchedulerInterface, credentials: CredentialsType = None,		self,
		scheduler: SchedulerInterface,
		incremental: bool = False,
		credentials: CredentialsType = None,
):		):
super().__init__(		super().__init__(
scheduler=scheduler,		scheduler=scheduler,
url=self.GOLANG_MODULES_INDEX_URL,		url=self.GOLANG_MODULES_INDEX_URL,
instance="Golang",		instance="Golang",
		anlambertUnsubmitted Done Inline Actions You should add an `incremental` parameter to allow full relisting if set to `False`. anlambert: You should add an `incremental` parameter to allow full relisting if set to `False`.
credentials=credentials,		credentials=credentials,
)		)

self.session = requests.Session()		self.session = requests.Session()
self.session.headers.update(		self.session.headers.update(
{"Accept": "application/json", "User-Agent": USER_AGENT}		{"Accept": "application/json", "User-Agent": USER_AGENT}
)		)
		self.incremental = incremental

		def state_from_dict(self, d: Dict[str, Any]) -> GolangStateType:
		as_string = d.get("last_seen")
		last_seen = iso8601.parse_date(as_string) if as_string is not None else None
		return GolangStateType(last_seen=last_seen)

		def state_to_dict(self, state: GolangStateType) -> Dict[str, Any]:
		return {
		"last_seen": state.last_seen.isoformat()
		if state.last_seen is not None
		else None
		}

		def finalize(self):
		if self.state.last_seen is not None:
		scheduler_state = self.get_state_from_scheduler()

		if (
		scheduler_state.last_seen is None
		or self.state.last_seen > scheduler_state.last_seen
		):
		self.updated = True

@throttling_retry(		@throttling_retry(
retry=retry_policy_generic,		retry=retry_policy_generic,
before_sleep=before_sleep_log(logger, logging.WARNING),		before_sleep=before_sleep_log(logger, logging.WARNING),
)		)
def api_request(self, url: str) -> List[str]:		def api_request(self, url: str) -> List[str]:
logger.debug("Fetching URL %s", url)		logger.debug("Fetching URL %s", url)

▲ Show 20 Lines • Show All 41 Lines • ▼ Show 20 Lines	) -> Tuple[GolangPageType, Optional[datetime]]:
entry["Timestamp"] = timestamp		entry["Timestamp"] = timestamp
page.append(entry)		page.append(entry)
# The index is guaranteed to be sorted in chronological order		# The index is guaranteed to be sorted in chronological order
since = timestamp		since = timestamp

return page, since		return page, since

def get_pages(self) -> Iterator[GolangPageType]:		def get_pages(self) -> Iterator[GolangPageType]:
page, since = self.get_single_page()		since = None
last_since = since		if self.incremental:
while page:		since = self.state.last_seen
yield page
page, since = self.get_single_page(since=since)		page, since = self.get_single_page(since=since)
if last_since == since:		if since == self.state.last_seen:
# The index returns packages whose timestamp are greater or		# The index returns packages whose timestamp are greater or
# equal to the date provided as parameter, which will create		# equal to the date provided as parameter, which will create
# an infinite loop if not stopped here.		# an infinite loop if not stopped here.
return []		return [], since
last_since = since		if since is not None:
		self.state.last_seen = since

		anlambertUnsubmitted Not Done Inline Actions You should ignore the state here if the lister is not in incremental mode. anlambert: You should ignore the state here if the lister is not in incremental mode.
		AlphareAuthorUnsubmitted Done Inline Actions I should ignore it for listing, but not for updating the state, correct? That way a full run will still save the last timestamp for the next incremental run. Alphare: I should ignore it for listing, but not for updating the state, correct? That way a full run…
		anlambertUnsubmitted Not Done Inline Actions Other listers do not save any state when they are executed in non incremental mode so you should do the same imho. anlambert: Other listers do not save any state when they are executed in non incremental mode so you…
		while page:
		yield page
		page, since = self.get_single_page(since=since)
		if since == self.state.last_seen:
		return [], since
		if since is not None:
		self.state.last_seen = since

def get_origins_from_page(self, page: GolangPageType) -> Iterator[ListedOrigin]:		def get_origins_from_page(self, page: GolangPageType) -> Iterator[ListedOrigin]:
"""		"""
Iterate on all Golang projects and yield ListedOrigin instances.		Iterate on all Golang projects and yield ListedOrigin instances.
"""		"""
assert self.lister_obj.id is not None		assert self.lister_obj.id is not None

for module in page:		for module in page:
path = module["Path"]		path = module["Path"]
# The loader will be expected to use the golang proxy to do the		# The loader will be expected to use the golang proxy to do the
# actual downloading. We're using `pkg.go.dev` so that the URL points		# actual downloading. We're using `pkg.go.dev` so that the URL points
# to somewhere useful for a human instead of an (incomplete) API path.		# to somewhere useful for a human instead of an (incomplete) API path.
origin_url = f"https://pkg.go.dev/{path}"		origin_url = f"https://pkg.go.dev/{path}"

# Since the Go index lists versions and not just packages, there will		# Since the Go index lists versions and not just packages, there will
# be duplicates. Fortunately, `ListedOrigins` are "upserted" server-side,		# be duplicates. Fortunately, `ListedOrigins` are "upserted" server-side,
# so only the last timestamp will be used, with no duplicates.		# so only the last timestamp will be used, with no duplicates.
# Performance should not be an issue as they are sent to the db in bulk.		# Performance should not be an issue as they are sent to the db in bulk.
		anlambertUnsubmitted Not Done Inline Actions Could you use `https://pkg.go.dev/{path}` instead ? Current origin URL yields a 404 when trying to browse it, which is not great. For instance for the `golang.org/x/text` package: https://proxy.golang.org/golang.org/x/text => 404 https://pkg.go.dev/golang.org/x/text => nice landing page giving all info about archived package anlambert: Could you use `https://pkg.go.dev/{path}` instead ? Current origin URL yields a 404 when…
		AlphareAuthorUnsubmitted Done Inline Actions Sure, then the loader will need to expect those URLs and substitute them with the proxy prefix. If that's fine with you, I can do that change Alphare: Sure, then the loader will need to expect those URLs and substitute them with the proxy prefix.
		anlambertUnsubmitted Not Done Inline Actions Sounds good to me, thanks! anlambert: Sounds good to me, thanks!
yield ListedOrigin(		yield ListedOrigin(
lister_id=self.lister_obj.id,		lister_id=self.lister_obj.id,
url=origin_url,		url=origin_url,
visit_type="golang",		visit_type="golang",
last_update=module["Timestamp"],		last_update=module["Timestamp"],
)		)