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Document rationale for disallowing clear state program inner transactions #3586

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Document rationale for disallowing clear state program inner transactions #3586

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7 changes: 7 additions & 0 deletions data/transactions/logic/eval.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4062,6 +4062,13 @@ func opTxBegin(cx *EvalContext) {
cx.err = errors.New("itxn_begin without itxn_submit")
return
}

// Product decision - Prevent clear state programs (CSPs) from issuing inner
// transactions to minimize complexity.
// * If CSPs support inner transactions, downstream program errors may
// complicate CSP guarantees for opting out accounts from apps.
// * Since the team felt CSP inner transactions are a narrow(er) use case,
// the complexity tradeoff did _not_ feel justified.
if cx.Proto.IsolateClearState && cx.Txn.Txn.OnCompletion == transactions.ClearStateOC {
cx.err = errors.New("clear state programs can not issue inner transactions")
return
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