Ungraceful behaviour if view returns a function
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Key: COUCHDB-354
URL: https://issues.apache.org/jira/browse/COUCHDB-354
Project: CouchDB
Issue Type: Improvement
Components: JavaScript View Server
Environment: {"couchdb":"Welcome","version":"0.10.0a776990"}
Reporter: Brian Candler
Priority: Minor
If a typo in a view definition causes it to return a function instead of a
normal value:
* the view server crashes
* you get a huge Erlang barf in the log with worrying messages like "OS process
timed out" and "brutal kill"
I got all this just by accidentally writing "vs.shift" instead of "vs.shift()"
The fundamental problem is that a function cannot be serialised in toJSON, but
the error message is not helpful:
OS Process Log Message: Error converting object to JSON: TypeError:
{Array:function (v) {var ... snip loads ... "Object"] is not a function
When actually the problem is that the object I was trying to convert *was* a
function :-)
I will attach some code which replicates this, and the barf generated.
Of course this is entirely down to user error in an invalid map/reduce
function. However there's already a clean error for 'undefined', maybe this
could be done for 'function' too (or indeed any non-serialisable entity)
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