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[DISCUSS] Validate new document writes against max_http_request_size #1253

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[DISCUSS] Validate new document writes against max_http_request_size #1253

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6755eac
feat: validate new document writes against max_http_request_size
janl Mar 29, 2018
ee70b56
wip
janl Mar 29, 2018
0e06697
fix comment
janl Jul 13, 2018
616ec02
hardcode mock uuid
janl Jul 13, 2018
797c6d7
remove debug log
janl Jul 13, 2018
e6ae447
smarter uuid
janl Jul 13, 2018
dac755b
Merge branch 'master' into feat/max-req-size
janl Jul 13, 2018
244442c
Better total (body + attachments) size checking for documents
nickva Jul 13, 2018
e2f556d
Merge pull request #6 from cloudant/better-total-doc-size-checking
janl Jul 13, 2018
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hardcode mock uuid
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@janl
janl committed Jul 13, 2018
commit 616ec02aefbddff4bb37f87d2edf2539127c40f7
2 changes: 1 addition & 1 deletion src/couch/src/couch_doc.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -148,7 +148,7 @@ from_json_obj_validate(EJson, DbName) ->
validate_total_document_size(#doc{id=DocId, body=Body, atts=Atts0}=Doc) ->
couch_log:debug("~nData: ~p~n", [Doc]),
MaxReqSize = config:get_integer("httpd", "max_http_request_size", 4294967296), % 4 GB
Boundary = couch_uuids:random(), % mock boundary, is only used for the length
Boundary = <<"d07e231b4fc27759fd822449377fcba7">>,
Atts = lists:map(fun couch_att:to_tuple/1, Atts0),
{_, DocSum} = couch_httpd_multipart:length_multipart_stream(Boundary,
?JSON_ENCODE(Body), Atts),
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When we re-encode, we use jiffy, but unless it is a request made by the replicator, the user probably didn't use erlang to encode the data, so we could get a different value. There is also some performance loss in say re-encoding larger document bodies back to json just to check their size.

There is no canonical json encoding and so no canonical encoded json size. Above we are calculating the encoded size using a conservative size estimate (giving the user a benefit of the doubt) and with better performance (https://github.com/nickva/couch_ebench). Maybe make a version of length calculation that takes sizes and then we'd pass the already computed couch_ejson_size:encoded_size(Doc#doc.body) and 32 for boundary size.

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Thanks @nickva, I’ll give this a ponder!

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