R function error handling
If the handler reports an R function execution or loading error, the runtime automatically catches the error and returns a JSON document with information about the error type. For more information about the JSON document format, see Invoking a function.
The error info is also written to the execution log. You can view the log via the Yandex Cloud CLI or the management console.
Examples of error handling
Case 1: User code goes outside the array boundaries, causing the function to throw non-numeric argument to binary operator. The runtime catches the exception and generates a JSON document containing the error message (the errorMessage field) and error type (the errorType field).
Function code:
handler <-function() {
return(paste0('{"result":"', "1" + 2,'"}'))
}
JSON document returned:
{
"errorMessage": "Error in a + b: non-numeric argument to binary operator\n",
"errorType": "simpleError",
}
Case 2: User code indicates an error by throwing an exception from the function.
Function code:
handler <- function() {
stop("Some error message")
}
JSON document returned:
{
"errorMessage": "Error in handler(): Some error message\n",
"errorType": "simpleError",
}