browsertrix/backend/crawls.py

""" Crawl API """

import asyncio

from typing import Optional, List
from datetime import datetime

from fastapi import Depends, HTTPException
from pydantic import BaseModel
import pymongo

from db import BaseMongoModel
from archives import Archive


# ============================================================================
class DeleteCrawlList(BaseModel):
    """ delete crawl list POST body """

    crawl_ids: List[str]


# ============================================================================
class Crawl(BaseMongoModel):
    """ Store State of a Crawl (Finished or Running) """

    user: str
    aid: str
    cid: str

    schedule: Optional[str]
    manual: Optional[bool]

    started: datetime
    finished: Optional[datetime]

    state: str

    filename: Optional[str]
    size: Optional[int]
    hash: Optional[str]


# ============================================================================
class CrawlCompleteIn(BaseModel):
    """ Completed Crawl Webhook POST message  """

    id: str

    user: str

    filename: str
    size: int
    hash: str

    completed: Optional[bool] = True


# ============================================================================
class CrawlOps:
    """ Crawl Ops """

    def __init__(self, mdb, crawl_manager, archives):
        self.crawls = mdb["crawls"]
        self.crawl_manager = crawl_manager
        self.archives = archives

        self.crawl_manager.set_crawl_ops(self)

    async def on_handle_crawl_complete(self, msg: CrawlCompleteIn):
        """ Handle completed crawl, add to crawls db collection, also update archive usage """
        crawl = await self.crawl_manager.validate_crawl_complete(msg)
        if not crawl:
            print("Not a valid crawl complete msg!", flush=True)
            return

        await self.store_crawl(crawl, update_existing=True)

    async def store_crawl(self, crawl: Crawl, update_existing=False):
        """ Add finished crawl to db, increment archive usage """
        if update_existing:
            await self.crawls.find_one_and_replace(
                {"_id": crawl.id}, crawl.to_dict(), upsert=True
            )
        else:
            try:
                await self.crawls.insert_one(crawl.to_dict())
            except pymongo.errors.DuplicateKeyError:
                print(f"Crawl Already Added: {crawl.id}")
                return False

        dura = int((crawl.finished - crawl.started).total_seconds())

        print(crawl, flush=True)
        print(f"Duration: {dura}", flush=True)

        await self.archives.inc_usage(crawl.aid, dura)

    async def list_crawls(self, aid: str, cid: str = None):
        """Get all crawl configs for an archive is a member of"""
        query = {"aid": aid}
        if cid:
            query["cid"] = cid

        cursor = self.crawls.find(query)
        results = await cursor.to_list(length=1000)
        return [Crawl.from_dict(res) for res in results]

    async def delete_crawls(self, aid: str, delete_list: DeleteCrawlList):
        """ Delete a list of crawls by id for given archive """
        res = await self.crawls.delete_many(
            {"_id": {"$in": delete_list.crawl_ids}, "aid": aid}
        )
        return res.deleted_count


# ============================================================================
def init_crawls_api(app, mdb, crawl_manager, archives):
    """ API for crawl management, including crawl done callback"""

    ops = CrawlOps(mdb, crawl_manager, archives)

    archive_crawl_dep = archives.archive_crawl_dep

    @app.post("/crawls/done", tags=["crawls"])
    async def crawl_done(msg: CrawlCompleteIn):
        loop = asyncio.get_running_loop()
        loop.create_task(ops.on_handle_crawl_complete(msg))

        return {"success": True}

    @app.get("/archives/{aid}/crawls", tags=["crawls"])
    async def list_crawls(archive: Archive = Depends(archive_crawl_dep)):
        aid = str(archive.id)

        running_crawls = await crawl_manager.list_running_crawls(aid=aid)

        finished_crawls = await ops.list_crawls(aid)

        return {
            "running": [
                crawl.dict(exclude_none=True, exclude_unset=True)
                for crawl in running_crawls
            ],
            "finished": finished_crawls,
        }

    @app.post(
        "/archives/{aid}/crawls/{crawl_id}/cancel",
        tags=["crawls"],
    )
    async def crawl_cancel_stop(
        crawl_id, archive: Archive = Depends(archive_crawl_dep)
    ):
        try:
            crawl = await crawl_manager.stop_crawl(crawl_id, archive.id, graceful=False)
            if not crawl:
                raise HTTPException(
                    status_code=404, detail=f"Crawl not found: {crawl_id}"
                )

            await ops.store_crawl(crawl)

        except HTTPException as httpe:
            raise httpe

        except Exception as exc:
            # pylint: disable=raise-missing-from
            raise HTTPException(status_code=400, detail=f"Error Canceling Crawl: {exc}")

        return {"canceled": True}

    @app.post(
        "/archives/{aid}/crawls/{crawl_id}/stop",
        tags=["crawls"],
    )
    async def crawl_graceful_stop(
        crawl_id, archive: Archive = Depends(archive_crawl_dep)
    ):
        try:
            canceled = await crawl_manager.stop_crawl(
                crawl_id, archive.id, graceful=True
            )
            if not canceled:
                raise HTTPException(
                    status_code=404, detail=f"Crawl not found: {crawl_id}"
                )

        except HTTPException as httpe:
            raise httpe

        except Exception as exc:
            # pylint: disable=raise-missing-from
            raise HTTPException(status_code=400, detail=f"Error Stopping Crawl: {exc}")

        return {"stopped_gracefully": True}

    @app.post("/archives/{aid}/crawls/delete", tags=["crawls"])
    async def delete_crawls(
        delete_list: DeleteCrawlList, archive: Archive = Depends(archive_crawl_dep)
    ):
        res = await ops.delete_crawls(archive.id, delete_list)
        return {"deleted": res}