bug(realtime): array converters throw past their catch on a JSON array with a bad element

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#437 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
78/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
csharp
Domain
api

Research direction

Start with IntArrayConverter and StringArrayConverter, then compare their reader handling with the PostgresNestedArrayConverter fix in #436. Reproduce the bad-element, object, and string-literal cases in Model(); done means invalid JSON array input no longer loses the record or causes a read-too-much/read-too-little exception, while the string-literal path still returns null.

Written by the indexing model from the issue text.

Description

IntArrayConverter and StringArrayConverter return null for anything they cannot read, but only on the string-literal path. On the JSON path a failing element leaves the reader half way through the array, and an object in place of the array is never consumed, so System.Text.Json throws "read too much or not enough" after Read returns and the whole record fails in Model<T>().

{"favorite_numbers":[1,"x"]}   // JsonException, record lost
{"favorite_numbers":{}}        // same
{"favorite_numbers":"{1,x}"}   // null, as intended

Fix is the one PostgresNestedArrayConverter got in #436: copy the reader before the try, and in the catch rewind it and Skip(); Skip() in the default branch too.

Dominant language
C#
Stars
701
Forks
106
Avg merge
16h 35m
Merged PRs (30d)
45

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