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off-by-one#1747

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ukby1234 merged 5 commits intomasterfrom
off-by-one
Jan 5, 2022
Merged

off-by-one#1747
ukby1234 merged 5 commits intomasterfrom
off-by-one

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@ukby1234 ukby1234 commented Jan 4, 2022

always transfer one more ksm to fix rounding issue

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@ukby1234 ukby1234 requested a review from xlc January 4, 2022 08:49
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Better to have some integration test to cover this kind of errors.
Also should use saturated add

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ukby1234 commented Jan 4, 2022

added integration tests. I don't think saturated add is the right semantics here because we do want to ensure the converted back balance >= the original balance. This means if +1 is an overflow, it should fail.

@ukby1234 ukby1234 enabled auto-merge (squash) January 4, 2022 22:31
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xlc commented Jan 4, 2022

But you are using unwrap_or_default so overflow become 0, which is more wrong than max value.

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ukby1234 commented Jan 4, 2022

Yeah, but when it becomes 0, our program definitely won't work on the current transaction instead of failing on possible later transactions. This gives us much more visibility.

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xlc commented Jan 4, 2022

ok. in that case can you add some comments in the code to explain why return 0 on edge case is better? also should use and_then instead of multiple unwrap_of_default

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xlc reviewed Jan 4, 2022
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Frank Yin and others added 2 commits January 4, 2022 15:26
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Update runtime/mandala/src/lib.rs
3132544 
Co-authored-by: Xiliang Chen <xlchen1291@gmail.com>
fix the other lambda
53d8bfc
@ukby1234 ukby1234 merged commit df09171 into master Jan 5, 2022
@ukby1234 ukby1234 deleted the off-by-one branch January 5, 2022 00:32
syan095 pushed a commit that referenced this pull request Jan 7, 2022
Merge remote-tracking branch 'origin/master' into fix/test-coverage
ae57f42 
* origin/master: (102 commits)
  Fix collect_fee (#1754)
  Update HEADER-GPL3
  Update extrinsic-ordering-check-from-bin.yml (#1752)
  Update HEADER-GPL3
  bump version (#1751)
  Remove homa-lite from karura runtime (#1744)
  off-by-one (#1747)
  Revert "simulate exchange rate (#1742)" (#1746)
  simulate exchange rate (#1742)
  bump version (#1743)
  refactor homa (#1648)
  Update stable asset (#1741)
  add more info to events (#1740)
  Fix mandala swap path error (#1736)
  update stable asset (#1738)
  remove unnecessary code (#1735)
  fix currency id testing (#1733)
  rework fee payment (#1687)
  Add Deposit for Setting Alternative Fee Swap Path (#1730)
  Add register_erc20_asset and update_erc20_asset (#1731)
  ...

# Conflicts:
#	.github/workflows/coverage.yml.disabled
#	Cargo.lock
#	Cargo.toml
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