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fixDisallowIncomingV1 #4721

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merged 10 commits into from
Oct 5, 2023
Merged

fixDisallowIncomingV1 #4721

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fixDisallowIncomingV1
dangell7 Sep 21, 2023
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Merge branch 'develop' into fixDisallowIncomingV1
dangell7 Sep 21, 2023
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Merge branch 'develop' into fixDisallowIncomingV1
dangell7 Sep 22, 2023
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Merge branch 'develop' into fixDisallowIncomingV1
dangell7 Sep 25, 2023
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dangell7 Sep 28, 2023
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dangell7 Oct 4, 2023
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Merge branch 'develop' into fixDisallowIncomingV1
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dangell7 Oct 5, 2023
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12 changes: 10 additions & 2 deletions src/ripple/app/tx/impl/SetTrust.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -133,14 +133,22 @@ SetTrust::preclaim(PreclaimContext const& ctx)
auto const sleDst = ctx.view.read(keylet::account(uDstAccountID));

// If the destination has opted to disallow incoming trustlines
// then honour that flag
// then honour that flag ONLY if the trustline doesn't exist
if (ctx.view.rules().enabled(featureDisallowIncoming))
{
if (!sleDst)
return tecNO_DST;

if (sleDst->getFlags() & lsfDisallowIncomingTrustline)
return tecNO_PERMISSION;
{
if (ctx.view.rules().enabled(fixDisallowIncomingV1) &&
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ctx.view.exists(keylet::line(id, uDstAccountID, currency)))
{
// pass
}
else
return tecNO_PERMISSION;
Comment on lines +149 to +155
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Why not just invert the if and return inside it, instead of having an empty if and returning in the else?

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I actually have it like that on my local branch but with clang-format it makes it very "compact". I'm open to doing it like that if its preferred. It was just done like that for readability.

if (ctx.view.rules().enabled(fixDisallowIncomingV1) &&
        !ctx.view.exists(keylet::line(id, uDstAccountID, currency)))
        return tecNO_PERMISSION;

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In general positive conditions should be preferred over negative conditions. They are quick and easy to scan through, it's very obvious to the reader what's happening. The more complicated the condition the more likely the next programmer will misunderstand it and insert a mistake.

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Personally, I have no trouble reading the current formulation of the if. So I'm good with leaving it the way it is.

}
}

// If destination is AMM and the trustline doesn't exist then only
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3 changes: 2 additions & 1 deletion src/ripple/protocol/Feature.h
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Expand Up @@ -74,7 +74,7 @@ namespace detail {
// Feature.cpp. Because it's only used to reserve storage, and determine how
// large to make the FeatureBitset, it MAY be larger. It MUST NOT be less than
// the actual number of amendments. A LogicError on startup will verify this.
static constexpr std::size_t numFeatures = 62;
static constexpr std::size_t numFeatures = 63;

/** Amendments that this server supports and the default voting behavior.
Whether they are enabled depends on the Rules defined in the validated
Expand Down Expand Up @@ -349,6 +349,7 @@ extern uint256 const fixNFTokenRemint;
extern uint256 const fixReducedOffersV1;
extern uint256 const featureClawback;
extern uint256 const featureXChainBridge;
extern uint256 const fixDisallowIncomingV1;

} // namespace ripple

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1 change: 1 addition & 0 deletions src/ripple/protocol/impl/Feature.cpp
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Expand Up @@ -456,6 +456,7 @@ REGISTER_FIX (fixReducedOffersV1, Supported::yes, VoteBehavior::De
REGISTER_FEATURE(Clawback, Supported::yes, VoteBehavior::DefaultNo);
REGISTER_FEATURE(AMM, Supported::yes, VoteBehavior::DefaultNo);
REGISTER_FEATURE(XChainBridge, Supported::yes, VoteBehavior::DefaultNo);
REGISTER_FIX(fixDisallowIncomingV1, Supported::yes, VoteBehavior::DefaultNo);

// The following amendments are obsolete, but must remain supported
// because they could potentially get enabled.
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42 changes: 42 additions & 0 deletions src/test/app/SetTrust_test.cpp
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Expand Up @@ -275,6 +275,48 @@ class SetTrust_test : public beast::unit_test::suite
BEAST_EXPECT(!(flags & lsfDisallowIncomingTrustline));
}

// fixDisallowIncomingV1
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{
for (bool const withFix : {true, false})
{
auto const amend = withFix
? features | disallowIncoming
: (features | disallowIncoming) - fixDisallowIncomingV1;

Env env{*this, amend};
auto const dist = Account("dist");
auto const gw = Account("gw");
auto const USD = gw["USD"];
auto const distUSD = dist["USD"];

env.fund(XRP(1000), gw, dist);
env.close();

env(fset(gw, asfRequireAuth));
env.close();

env(fset(dist, asfDisallowIncomingTrustline));
env.close();

env(trust(dist, USD(10000)));
env.close();

// withFix: can set trustline
// withOutFix: cannot set trustline
auto const trustResult =
withFix ? ter(tesSUCCESS) : ter(tecNO_PERMISSION);
env(trust(gw, distUSD(10000)),
txflags(tfSetfAuth),
trustResult);
env.close();

auto const txResult =
withFix ? ter(tesSUCCESS) : ter(tecPATH_DRY);
env(pay(gw, dist, USD(1000)), txResult);
env.close();
}
}

Env env{*this, features | disallowIncoming};

auto const gw = Account{"gateway"};
Expand Down