def __parse_and_validate_instruction(
instruction: TransactionInstruction,
expected_keys: int,
expected_type: InstructionType,
) -> Any: # Returns a Construct container.
validate_instruction_keys(instruction, expected_keys)
data = SYSTEM_INSTRUCTIONS_LAYOUT.parse(instruction.data)
validate_instruction_type(data, expected_type)
return data
def decode_initialize_multisig(instruction: TransactionInstruction) -> InitializeMultisigParams:
"""Decode an initialize multisig account token instruction and retrieve the instruction params."""
parsed_data = __parse_and_validate_instruction(instruction, 2, InstructionType.InitializeMultisig)
num_signers = parsed_data.args.m
validate_instruction_keys(instruction, 2 + num_signers)
return InitializeMultisigParams(
program_id=instruction.program_id,
multisig=instruction.keys[0].pubkey,
signers=[signer.pubkey for signer in instruction.keys[-num_signers:]],
m=num_signers,
)
def __parse_and_validate_instruction(instruction: TransactionInstruction,
instruction_type: InstructionType) -> Any:
instruction_type_to_length_map: Dict[InstructionType, int] = {
InstructionType.InitializeMarket: 9,
InstructionType.NewOrder: 9,
InstructionType.MatchOrder: 7,
InstructionType.ConsumeEvents: 2,
InstructionType.CancelOrder: 4,
InstructionType.CancelOrderByClientID: 4,
InstructionType.SettleFunds: 9,
}
validate_instruction_keys(instruction,
instruction_type_to_length_map[instruction_type])
data = INSTRUCTIONS_LAYOUT.parse(instruction.data)
validate_instruction_type(data, instruction_type)
return data
