how to catch defer onerror

[boy-good]

defer action maybe onerror how to catch in contract?

[spartucus]

same here, maybe a missing authority of ${account} error?

[boy-good]

@spartucus i found the error maked by contract eosio_assert. the eosx.io can see the error. I want to know how to catch it in contract , like in "apply" function?

[hama]

you should use onerror. https://github.com/EOSIO/eos/blob/ea08cfd3d1a82b634a9e84f971d99708af516c0d/unittests/contracts/deferred_test/deferred_test.cpp#L47

[taokayan]

You need to implement the "onerror" action

[boy-good]

@taokayan @hama only support to print error? Can operate table in "apply_onerror" function like "deferred_test.cpp"?

[vtsurka]

Also interesting how get which assert in deferred transaction trigger onerror situation.

[jgiszczak]

@boy-good There are no restrictions on what can be done in apply_onerror(). See https://github.com/EOSIO/eos/blob/ea08cfd3d1a82b634a9e84f971d99708af516c0d/contracts/proxy/proxy.cpp#L71 for another example. Note that injudicious code could result in permanent loops, so care must be taken.

@vtsurka The above reference shows an example of retrieving the sent transaction in apply_onerror().