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54 lines
1.4 KiB
Plaintext
54 lines
1.4 KiB
Plaintext
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possible architecture of brozzler-hq
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====================================
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keeps queues in rdbms
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because easy to update, index on priority, index on canonicalized url
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also easy to inspect
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initially sqlite
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-- sqlite3 syntax
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create table brozzler_sites (
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id integer primary key,
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-- claimed boolean,
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site_json text,
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-- data_limit integer, -- bytes
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-- time_limit integer, -- seconds
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-- page_limit integer,
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);
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create table brozzler_urls (
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id integer primary key,
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site_id integer,
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priority integer,
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in_progress boolean,
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canon_url varchar(4000),
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crawl_url_json text,
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index(priority),
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index(canon_url),
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index(site_id)
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);
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feeds rabbitmq:
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- json payloads
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- queue per site brozzler.{site_id}.crawl_urls
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- queue of unclaimed sites brozzler.sites.unclaimed
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reads from rabbitmq
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- queue of new sites brozzler.sites.new
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- queue per site brozzler.{site_id}.completed_urls
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* json blob fed to this queue includes urls extracted to schedule
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??? brozzler-hq considers site unclaimed if brozzler.{site_id}.crawl_urls has
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not been read in some amount of time ??? or do workers need to explicitly
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disclaim ???
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brozzler-worker
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- decides if it can run a new browser
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- if so reads site from brozzler.sites.unclaimed
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- site includes scope definition, crawl job info, ...
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- starts browser
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- reads urls from brozzler.{site-id}.crawl_urls
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- after each(?) (every n?) urls, feeds brozzler.{site_id}.completed_urls
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