Add CScriptNum decode python implementation in functional suite #14816

pull instagibbs wants to merge 1 commits into bitcoin:master from instagibbs:functional_cscriptnum_decode changing 2 files +26 −2
  1. instagibbs commented at 3:22 pm on November 27, 2018: member
    I needed this for reasons and thought it’d be good to upsteam it.
  2. fanquake added the label Tests on Nov 27, 2018
  3. in test/functional/test_framework/script.py:374 in 104a6bdd31 outdated 
    370@@ -371,11 +371,12 @@ def __init__(self, d=0):
371 
372     @staticmethod
373     def encode(obj):
374+        val = obj.value
    promag commented at 4:17 pm on November 27, 2018:
    Could discard these unrelated changes.
    instagibbs commented at 4:25 pm on November 27, 2018:
    it reduces the verbosity of it, I can remove but seemed better to me.
    promag commented at 4:34 pm on November 28, 2018:
    I understand but IMO it’s better without.
    instagibbs commented at 4:46 pm on November 28, 2018:
    already removed
    promag commented at 4:54 pm on November 28, 2018:
    Yeah I know :)
  4. in test/functional/test_framework/script.py:396 in 104a6bdd31 outdated 
    392+        value = vch[1:]
393+        # Mask for all but the highest result bit
394+        num_mask = (2**(len(value)*8) - 1) >> 1
395+        if len(value) == 0:
396+            return 0
397+        else :
    promag commented at 4:18 pm on November 27, 2018:
    nit, remove extra space.
    instagibbs commented at 4:43 pm on November 27, 2018:
    done
  5. promag commented at 4:21 pm on November 27, 2018: member

    Restarted appveyor.

    I needed this for reasons and thought it’d be good to upsteam it.

    Could add one reason? otherwise this is dead code.

  6. instagibbs commented at 4:25 pm on November 27, 2018: member

    @promag it can(should?) be used in tests in the future. Allows extraction of blockheight from the coinbase transaction, for example.

    I can think a bit more where to stick this into a test, which I noted in the OP.

  7. promag commented at 4:28 pm on November 27, 2018: member
    @instagibbs I just think you could add one usage here.
  8. instagibbs force-pushed on Nov 27, 2018
  9. instagibbs force-pushed on Nov 27, 2018
  10. instagibbs force-pushed on Nov 27, 2018
  11. instagibbs commented at 4:45 pm on November 27, 2018: member
    Addressed issues, and added a single usage in a test.
  12. in test/functional/mining_basic.py:74 in 9f9bd43026 outdated 
    70+        coinbase_tx = create_coinbase(height=next_height)
71         # sequence numbers must not be max for nLockTime to have effect
72         coinbase_tx.vin[0].nSequence = 2 ** 32 - 2
73         coinbase_tx.rehash()
74 
75+        # round-tip the encoded bip34 block height commitment
    Empact commented at 8:23 pm on November 27, 2018:
    typo: tip/trip
    instagibbs commented at 1:32 pm on November 29, 2018:
    fixed
  13. in test/functional/test_framework/script.py:393 in 9f9bd43026 outdated 
    384@@ -385,6 +385,23 @@ def encode(obj):
385             r[-1] |= 0x80
386         return bytes([len(r)]) + r
387 
388+    @staticmethod
389+    def decode(vch):
390+        # We assume valid push_size and minimal encoding
391+        value = vch[1:]
392+        # Mask for all but the highest result bit
393+        num_mask = (2**(len(value)*8) - 1) >> 1
    promag commented at 9:57 am on November 28, 2018:
    nit, could move this to L401.
  14. in test/functional/test_framework/script.py:396 in 9f9bd43026 outdated 
    391+        value = vch[1:]
392+        # Mask for all but the highest result bit
393+        num_mask = (2**(len(value)*8) - 1) >> 1
394+        if len(value) == 0:
395+            return 0
396+        else:
    promag commented at 9:57 am on November 28, 2018:
    nit, could remove else branch, and above just return 0 if len(value) == 0.
  15. promag commented at 9:59 am on November 28, 2018: member

    Thanks for adding the test, I think it makes this PR more complete. I’m leaving two nits for your consideration.

    utACK 9f9bd43.

  16. in test/functional/test_framework/script.py:398 in 9f9bd43026 outdated 
    393+        num_mask = (2**(len(value)*8) - 1) >> 1
394+        if len(value) == 0:
395+            return 0
396+        else:
397+            result = 0
398+            for i in range(len(value)):
    practicalswift commented at 12:39 pm on November 28, 2018:
    If @promag:s suggestion is not implemented: use enumerate which is more idiomatic :-)
  17. in test/functional/test_framework/script.py:393 in 9f9bd43026 outdated 
    389+    def decode(vch):
390+        # We assume valid push_size and minimal encoding
391+        value = vch[1:]
392+        # Mask for all but the highest result bit
393+        num_mask = (2**(len(value)*8) - 1) >> 1
394+        if len(value) == 0:
    practicalswift commented at 12:39 pm on November 28, 2018:
    If @promag:s suggestions is not implemented: Use if not value: which is more idiomatic
    instagibbs commented at 4:17 pm on November 28, 2018:
    fwiw I wouldn’t know hot to read that suggestion properly, sorry
    practicalswift commented at 7:26 pm on November 28, 2018:

    Yes leave it as is - it was just a nit :-)

    I just meant to say that if sequence: and if not sequence: are very common Python idioms for checking non-emptiness and emptiness of sequences. Perhaps this is not the ideal case for my suggestion since it is not obvious from the variable name that value is a sequence :-)

  18. instagibbs force-pushed on Nov 28, 2018
  19. instagibbs commented at 4:17 pm on November 28, 2018: member
    comments addressed, added multi-byte and negative round-trip testing as well
  20. Add CScriptNum decode python implementation in functional suite 2012d4df23
  21. instagibbs force-pushed on Nov 29, 2018
  22. scravy approved
  23. scravy commented at 1:35 pm on November 29, 2018: contributor
    utACK
  24. promag commented at 11:21 pm on November 30, 2018: member
    utACK 2012d4d, nice to have more usages.
  25. maguayo approved
  26. maguayo commented at 5:35 pm on December 1, 2018: none
    utACK
  27. laanwj commented at 10:27 am on December 4, 2018: member
    utACK 2012d4df23b7b065ccc1dbe596073d98e428fd3d
  28. laanwj merged this on Dec 4, 2018
  29. laanwj closed this on Dec 4, 2018
  30. laanwj referenced this in commit 0257062e50 on Dec 4, 2018
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instagibbs promag Empact practicalswift scravy maguayo laanwj

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