some webmentions silently dropped about wordpress-webmention HOT 21 CLOSED

I think it is a semantic-linkback thing... I will have an eye on it, but it is not that easy to reproduce ;)

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thanks for paying attention to it. i'll definitely help.

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Can it depend on closed comments?

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good guess...but no, i turned that off. none of my posts are ever closed for comments.

there are actually lots of comments on that post right now, they just don't show up because of wordpress-webmention/issues#13. i'll go delete the cache file to fix that.

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done: http://snarfed.org/2014-01-28_language-duct-tape

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That means that I can close this one?

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sorry, no. :/ the two webmentions i mentioned above still never showed up. i just cleared the cache so you could see the others.

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Ok, but that means that it is definitely a semantic-linkback problem... because the webmention plugin sends the correct headers...

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i think this was wordpress's "comment flood" detection, which returns 403 errors after any IP starts creating too many comments too quickly. i've installed the Disable Check Comment Flood plugin to prevent this. sorry for the false alarm!

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...actually, that couldn't be it, since these requests both returned 200. hrm. never mind!

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The flood control thing returns a HTML page and I think this page uses a normal 200 header... This is a bit odd... Can you send me the link to the flood control plugin, perhaps I could include something similar to the plugin...

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May be relating to this, maybe not, I'm getting a bunch of comments hitting the endpoint but end up silently being marked as spam.

Not sure if there's anything we can/should do about that (you can mark comments as approved on creation, but that might cause other issues). Anyway, y'know, just an FYI.

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hmm, you might be right about a normal 200 page vs 403. i may have misremembered. anyway, here's the plugin: http://wordpress.org/plugins/disable-check-comment-flood/

it's trivial, it's literally just this:

remove_filter('check_comment_flood', 'check_comment_flood_db');

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@mapkyca might be... the webmentions will be also checked by spam filters like askimet, like any other comment... I added all bird.gy links to the wordpress whitelist for example...

@snarfed I will try to disable it before i add the comment and reenable it afterwards... I hope this will work :)

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Further to this... bit of a head scratcher....

Actually had a stuck webmention, pulled the log from brid.gy and ran the request again using CURL. Webmention data was successfully pulled, comment looked ok, comment was saved - wp_new_comment returned an ID. When I looked in the database this comment did not exist.

So, it looks like something is coming along and removing the comment after it is created, and/or, there's a bug in wordpress whereby it'll return an ID even though there was a problem writing the comment. Not sure, haven't traced it back.

This was done with the Akismet plugin switched off, so it shouldn't be that.

Also tried wp_insert_comment, which supposedly bypasses comment filters, but no joy.

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Bingo: It's the do_action('webmention_post', $comment_ID) line.

Comment that out and the webmention is posting... not sure why this causes the comment to delete itself, and only sometimes, but hey....

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Then it seems to be the semantic-linkback-plugin... I will have a look at it and will change some parts... In some cases the semantic-linkback-plugin has to delete the webmention... long story :)

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I think this is also because of the comment-flood mechanism. The webmention is saved... the semantic-linkback plugin deletes it, to generate a more semantic one, but can't save it because of the flood mechanism.

@mapkyca Thanks for debugging it!

@snarfed I think I will disable the comment-flood mechanism at least for the webmention (and the semantic linkback) plugin.

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No problem :)

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agreed, nice debugging guys! makes sense to me, thanks for doing this.

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should be fixed now

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