Comments (5)
You can use a custom pipeline to update your database tables with your scraped data.
When your spiders are started, your starting urls can then be queried from the database.
You can use an ecto-based job queue like Honeydew to poll your database for things to be scraped and startup the relevant spiders accordingly. Or you can use Mnesia to persist state.
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@Ziinc Thanks again. Soon will do.
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Pitching in to mention CubQ as a way to implement durable queues in an embedded database. Full disclaimer: I am the author of the library. I created it mostly for embedded software scenarios, but I think it would fit well for keeping a crawler queue too.
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For improved fault tolerance, usage of persistent queues for requests/ScrapedItems would definitely be good.
However, this would involve an additional dependency, and it would be hard to argue for CubQ (backed by CubDb) over other more established queue libraries backed by Mnesia.
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I don't think that there is a strong case for improving fault tolerance and stability now when there are other features to be implemented.
Perhaps in the future, we can reopen this when there is a v1.
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Related Issues (20)
- Crawly.fetch giving 301 response instead of 200 HOT 1
- My Spider's code is never invoked, weird behavior with `Crawly.RequestsStorage.pop` in library code HOT 5
- This is actually a question, Nested scraping HOT 2
- Genserver time out crash in long-running pipeline HOT 1
- Stop and resume the spider where it stopped HOT 2
- Protocol error HOT 7
- `Crawly.Fetchers.Fetcher` implementation for Playwright HOT 4
- robots.txt matching is pretty buggy HOT 10
- Running many instances of one spider HOT 3
- Make the management tool opt-in by default HOT 5
- Q: Can the spider "fan out" on a website? (multiple next items) HOT 1
- Error: Could not load spiders. HOT 5
- [error] Pipeline crash by call: Crawly.Middlewares.UniqueRequest.run
- Encountering Complications with Forwarding to Crawly.API.Router HOT 1
- Upgrade to `httpoison` 2.x? HOT 3
- management Web UI on localhost:4001 is not working HOT 4
- Does Crawly support requests using the POST method? HOT 1
- Crawly compilation warnings, undefined Floki functions HOT 1
- CI issue: Failed to upload the report to 'https://coveralls.io', Couldn't find a repository matching this job. HOT 1
- Set base_url in init options instead of callback HOT 1
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