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8af2d80219
Before continuing on spectrum assignment we need to clearly identify blocking reasons:
implicit previous way (a path is missing) is not satisfactory because in case of
spectrum blocking a path was possible. So we introduce a 'blocking_reason' attribute
on requests, that will only exist if the path is blocked during the process.
The 'blocking_reason' attribute refflects the blocking reason.
Commit defines blocking types and group them depending on the existence of path or
feasibility:
'NO_PATH': no path was computed,
'NO_PATH_WITH_CONSTRAINT': no path was computed with this constraint
'NO_FEASIBLE_BAUDRATE_WITH_SPACING': no path was computed due to the spacing constraint
'NO_COMPUTED_SNR': the computed path could not give any SNR result
'NO_FEASIBLE_MODE': the user let the program choose a mode and path was computed but
no mode was feasible for the set of constraints
'MODE_NOT_FEASIBLE': the user imposed a mode, a path was computed but this mode
is not feasible
'NO_SPECTRUM': a path, a mode were selected but there is not enough spectrum available on
this path
Signed-off-by: EstherLerouzic <esther.lerouzic@orange.com>