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Change enum values to be powers of two (fix #3417) #4239

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merged 2 commits into from
Jun 29, 2023
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Change enum values to be powers of two (fix #3417) #4239

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248e2f0
fix: Update Handler::Condition enum values #3417
Jul 15, 2022
a0ffa0a
Merge branch 'develop' into issue3417
intelliot Jun 29, 2023
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16 changes: 7 additions & 9 deletions src/ripple/rpc/impl/Handler.h
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Original file line number Diff line number Diff line change
Expand Up @@ -39,8 +39,8 @@ namespace RPC {
enum Condition {
NO_CONDITION = 0,
NEEDS_NETWORK_CONNECTION = 1,
NEEDS_CURRENT_LEDGER = 2 + NEEDS_NETWORK_CONNECTION,
NEEDS_CLOSED_LEDGER = 4 + NEEDS_NETWORK_CONNECTION,
NEEDS_CURRENT_LEDGER = 1 << 1,
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Is NEEDS_NETWORK_CONNECTION not required anymore?

NEEDS_CLOSED_LEDGER = 1 << 2,
};

struct Handler
Expand Down Expand Up @@ -94,20 +94,18 @@ conditionMet(Condition condition_required, T& context)
}

if (context.app.getOPs().isAmendmentBlocked() &&
(condition_required & NEEDS_CURRENT_LEDGER ||
condition_required & NEEDS_CLOSED_LEDGER))
(condition_required != NO_CONDITION))
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This is not the same test as before. Is the change on purpose?

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yes, I agree that the conditions have changed. I made this change approximately one year ago, so I am spacing out on the details. Let me think/check and get back to you

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Based on the old values, I think the conditions are equivalent. Between NEEDS_CURRENT_LEDGER and NEEDS_CLOSED_LEDGER, having any of the three low bits set in condition_required would result in the expression evaluating to true, so that covers all of the != NO_CONDITION conditions. So functionally, they are equivalent.

Now whether that was the intent is a different question.

It turns out there are only two operations which have NEEDS_NETWORK_CONNECTION: ledger_cleaner and tx. I think it's fine to disallow both of them if the server is amendment blocked.

{
return rpcAMENDMENT_BLOCKED;
}

if (context.app.getOPs().isUNLBlocked() &&
(condition_required & NEEDS_CURRENT_LEDGER ||
condition_required & NEEDS_CLOSED_LEDGER))
(condition_required != NO_CONDITION))
{
return rpcEXPIRED_VALIDATOR_LIST;
}

if ((condition_required & NEEDS_NETWORK_CONNECTION) &&
if ((condition_required != NO_CONDITION) &&
(context.netOps.getOperatingMode() < OperatingMode::SYNCING))
{
JLOG(context.j.info()) << "Insufficient network mode for RPC: "
Expand All @@ -119,7 +117,7 @@ conditionMet(Condition condition_required, T& context)
}

if (!context.app.config().standalone() &&
condition_required & NEEDS_CURRENT_LEDGER)
condition_required != NO_CONDITION)
{
if (context.ledgerMaster.getValidatedLedgerAge() >
Tuning::maxValidatedLedgerAge)
Expand All @@ -143,7 +141,7 @@ conditionMet(Condition condition_required, T& context)
}
}

if ((condition_required & NEEDS_CLOSED_LEDGER) &&
if ((condition_required != NO_CONDITION) &&
!context.ledgerMaster.getClosedLedger())
{
if (context.apiVersion == 1)
Expand Down