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Add ledger entry diff to simulateTransaction response #120

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merged 5 commits into from Apr 4, 2024

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2opremio
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@2opremio 2opremio commented Apr 2, 2024

What

It adds the following field to SimulateTransactionResponse

StateDiff       []LedgerEntryChange            `json:"stateDiff,omitempty"`       // If present, it indicates how the state (ledger entries) will change as a result of the transaction execution.

where:

// LedgerEntryDiff designates a change in a ledger entry. Before and After cannot be be omitted at the same time.
// If Before is omitted, it constitutes a creation, if After is omitted, it constitutes a delation.
type LedgerEntryChange struct {
	Type   LedgerEntryChangeType `json:"type"`
	Key    string                `json:"key"`    // LedgerEntryKey in base64
	Before *string               `json:"before"` // LedgerEntry XDR in base64
	After  *string               `json:"after"`  // LedgerEntry XDR in base64
}

Why

Closes #11

Known limitations

It can considerably increase the size of simulate transaction responses (particularly for contract uploads, which will contain the full wasm).

It adds the following field to `SimulateTransactionResponse`

```
	StateDiff       []LedgerEntryDiff            `json:"stateDiff,omitempty"`       // If present, it indicates how the state (ledger entries) will change as a result of the transaction execution.

```

where:

```
// LedgerEntryDiff designates a change in a ledger entry. Before and After cannot be be omitted at the same time.
// If Before is omitted, it constitutes a creation, if After is omitted, it constitutes a delation.
type LedgerEntryDiff struct {
	Before string `json:"before,omitempty"` // LedgerEntry XDR in base64
	After  string `json:"after,omitempty"`  // LedgerEntry XDR in base64
}
```
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One request on the API and one question.

cmd/soroban-rpc/internal/methods/simulate_transaction.go Outdated Show resolved Hide resolved
cmd/soroban-rpc/internal/methods/simulate_transaction.go Outdated Show resolved Hide resolved
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2opremio commented Apr 3, 2024

@leighmcculloch PTAL

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👏🏻

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soroban-rpc: add effects/changes a transaction makes over an account in the simulation response
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