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CrawlerExample.Worker do | |
alias CrawlerExample.Queue | |
def work(depth_limit \\ 5) do | |
case Queue.pop() do | |
:empty -> | |
:ok | |
{:value, [url, depth]} -> | |
unless depth > depth_limit do | |
case request_page(url) do | |
#You can add more robust error handling here, typically If the error is an http error | |
#then it means the url is likely not crawlable and not worth retrying but | |
#I usually break it out by code and atleast log the specific error. | |
{:error, _} -> | |
:ok | |
{:ok, body} -> | |
get_children_urls(url, body) | |
|> Enum.map(fn c_url -> | |
Queue.push([depth+1, c_url]) | |
end) | |
:ok | |
end | |
else | |
:ok | |
end | |
end | |
end | |
end |
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