innerInstructions Missing From simulateTransaction

[0xIchigo]

Motivation

The simulateTransaction RPC method currently lacks support for the innerInstructions parameter. Adding this feature will allow users to include inner instructions in their simulations. This would be useful for developers who would like to simulate and debug complex transactions that involve multiple program invocations

Example use case

If a developer is working on a program with nested calls without the innerInstructions parameter, they cannot debug issues related to inner program invocations. By enabling innerInstructions, the developer can get a detailed log of all nested instructions, making it easier to identify and fix problems.

Moreover, developers looking to optimize their compute usage by first simulating their transactions with inner instructions are currently unable to do so via web3.js and would have to make the HTTP call directly.

Details

Behavior:

• The simulateTransaction method should accept an optional innerInstructions parameter of type boolean
• When the innerInstructions is set to true, the simulation response should include a detailed list of inner instructions executed during the transaction
• The response structure should match the structure defined in the Solana documentation for the inner instructions specifically, and the RPC documentation for the response as a whole

Implementation:

• Modify the SimulateTransactionConfig type to include the innerInstructions parameter
• Update the RPC call within the simulateTransaction method to pass in this parameter if provided

A PR implementing these changes will follow shortly! :)

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