Function parse_instruction 

pub fn parse_instruction(
    instruction_data: &[u8],
    accounts: &[Pubkey],
    signature: Signature,
    slot: u64,
    tx_index: u64,
    block_time_us: Option<i64>,
    grpc_recv_us: i64,
) -> Option<DexEvent>

Main PumpFun instruction parser

Note: Full event data (amounts, fees, reserves) is parsed from logs. Instruction parsing only handles MIGRATE_EVENT_LOG which is not available in logs.