Engine API: replace terminal block error with INVALID_TERMINAL_BLOCK status #170
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Replaces
-32002: Invalid terminal blockerror withINVALID_TERMINAL_BLOCKstatus value.The motivation behind this change is to have terminal block conditions check handled in a way similar to other block validity conditions in terms of response to CL.
Additionally, this PR does also contain an explicit requirement on invalidating all descendants of the last PoW block in the chain if this PoW block is not a valid terminal block.
Alternatively, we could use an
INVALIDstatus to signal terminal block conditions violations. But this status is accompanied withlatestValidHashwhich in the case of invalid terminal block can't be clearly defined, and moreover doesn't exist on CL. Thus, having a separate status tells that entire block tree starting from a transition block must be invalidated by CL, if this transition block is built upon invalid terminal block.