add stake program functionality

src/solana/_layouts/stake_instructions.py

@@ -0,0 +1,59 @@
+from enum import IntEnum
+
+from construct import (  # type: ignore
+    Int32ul,
+    Int64sl,
+    Int64ul,
+    Pass,
+    Switch,  # type: ignore
+)
+from construct import Struct as cStruct
+from spl.token._layouts import PUBLIC_KEY_LAYOUT
+
+
+class StakeInstructionType(IntEnum):
+    """Instruction types for staking program."""
+
+    INITIALIZE_STAKE_ACCOUNT = 0
+    DELEGATE_STAKE_ACCOUNT = 2
+    DEACTIVATE_STAKE_ACCOUNT = 5
+    WITHDRAW_STAKE_ACCOUNT = 4
+
+
+_AUTHORIZED_LAYOUT = cStruct(
+    "staker" / PUBLIC_KEY_LAYOUT,
+    "withdrawer" / PUBLIC_KEY_LAYOUT,
+)
+
+_LOCKUP_LAYOUT = cStruct(
+    "unix_timestamp" / Int64sl,
+    "epoch" / Int64ul,
+    "custodian" / PUBLIC_KEY_LAYOUT,
+)
+
+INITIALIZE_STAKE_ACCOUNT_LAYOUT = cStruct(
+    "authorized" / _AUTHORIZED_LAYOUT,
+    "lockup" / _LOCKUP_LAYOUT,
+)
+
+WITHDRAW_STAKE_ACCOUNT_LAYOUT = cStruct(
+    "lamports" / Int64ul,
+)
+
+DELEGATE_STAKE_INSTRUCTIONS_LAYOUT = cStruct(
+    "instruction_type" / Int32ul,
+)
+
+STAKE_INSTRUCTIONS_LAYOUT = cStruct(
+    "instruction_type" / Int32ul,
+    "args"
+    / Switch(
+        lambda this: this.instruction_type,
+        {
+            StakeInstructionType.INITIALIZE_STAKE_ACCOUNT: INITIALIZE_STAKE_ACCOUNT_LAYOUT,
+            StakeInstructionType.DELEGATE_STAKE_ACCOUNT: cStruct(),
+            StakeInstructionType.DEACTIVATE_STAKE_ACCOUNT: Pass,
+            StakeInstructionType.WITHDRAW_STAKE_ACCOUNT: WITHDRAW_STAKE_ACCOUNT_LAYOUT,
+        },
+    ),
+)

src/solana/stake_program.py

@@ -0,0 +1,288 @@
+"""Library to interface with the stake program."""
+from typing import NamedTuple, Union
+
+from solders import sysvar
+from solders.instruction import AccountMeta, Instruction
+from solders.pubkey import Pubkey
+from solders.system_program import (
+    CreateAccountParams,
+    CreateAccountWithSeedParams,
+    create_account,
+    create_account_with_seed,
+)
+
+from solana._layouts.stake_instructions import STAKE_INSTRUCTIONS_LAYOUT, StakeInstructionType
+from solana.transaction import Transaction
+
+STAKE_CONFIG_PUBKEY: Pubkey = Pubkey.from_string("StakeConfig11111111111111111111111111111111")
+STAKE_PUBKEY: Pubkey = Pubkey.from_string("Stake11111111111111111111111111111111111111")
+
+
+class Authorized(NamedTuple):
+    """Staking account authority info."""
+
+    staker: Pubkey
+    """"""
+    withdrawer: Pubkey
+    """"""
+
+
+class Lockup(NamedTuple):
+    """Stake account lockup info."""
+
+    unix_timestamp: int
+    """"""
+    epoch: int
+    """"""
+    custodian: Pubkey
+
+
+class InitializeStakeParams(NamedTuple):
+    """Initialize Staking params."""
+
+    stake_pubkey: Pubkey
+    """"""
+    authorized: Authorized
+    """"""
+    lockup: Lockup
+    """"""
+
+
+class CreateStakeAccountParams(NamedTuple):
+    """Create stake account transaction params."""
+
+    from_pubkey: Pubkey
+    """"""
+    stake_pubkey: Pubkey
+    """"""
+    authorized: Authorized
+    """"""
+    lockup: Lockup
+    """"""
+    lamports: int
+    """"""
+
+
+class CreateStakeAccountWithSeedParams(NamedTuple):
+    """Create stake account with seed transaction params."""
+
+    from_pubkey: Pubkey
+    """"""
+    stake_pubkey: Pubkey
+    """"""
+    base_pubkey: Pubkey
+    """"""
+    seed: str
+    """"""
+    authorized: Authorized
+    """"""
+    lockup: Lockup
+    """"""
+    lamports: int
+    """"""
+
+
+class DelegateStakeParams(NamedTuple):
+    """Create delegate stake account transaction params."""
+
+    stake_pubkey: Pubkey
+    """"""
+    authorized_pubkey: Pubkey
+    """"""
+    vote_pubkey: Pubkey
+    """"""
+
+
+class CreateAccountAndDelegateStakeParams(NamedTuple):
+    """Create and delegate a stake account transaction params."""
+
+    from_pubkey: Pubkey
+    """"""
+    stake_pubkey: Pubkey
+    """"""
+    vote_pubkey: Pubkey
+    """"""
+    authorized: Authorized
+    """"""
+    lockup: Lockup
+    """"""
+    lamports: int
+    """"""
+
+
+class CreateAccountWithSeedAndDelegateStakeParams(NamedTuple):
+    """Create and delegate stake account with seed transaction params."""
+
+    from_pubkey: Pubkey
+    """"""
+    stake_pubkey: Pubkey
+    """"""
+    base_pubkey: Pubkey
+    """"""
+    seed: str
+    """"""
+    vote_pubkey: Pubkey
+    """"""
+    authorized: Authorized
+    """"""
+    lockup: Lockup
+    """"""
+    lamports: int
+    """"""
+
+
+class WithdrawStakeParams(NamedTuple):
+    """Withdraw stake account params."""
+
+    stake_pubkey: Pubkey
+    """"""
+    withdrawer_pubkey: Pubkey
+    """"""
+    to_pubkey: Pubkey
+    """"""
+    lamports: int
+    """"""
+    custodian_pubkey: Pubkey
+    """"""
+
+
+def withdraw_stake(params: WithdrawStakeParams) -> Transaction:
+    """Withdraw stake."""
+    data = STAKE_INSTRUCTIONS_LAYOUT.build(
+        {"instruction_type:": StakeInstructionType.WITHDRAW_STAKE_ACCOUNT, "args": {"lamports": params.lamports}}
+    )
+
+    withdraw_instruction = Instruction(
+        accounts=[
+            AccountMeta(pubkey=params.stake_pubkey, is_signer=True, is_writable=True),
+            AccountMeta(pubkey=params.to_pubkey, is_signer=False, is_writable=True),
+            AccountMeta(pubkey=params.to_pubkey, is_signer=False, is_writable=True),
+            AccountMeta(pubkey=params.to_pubkey, is_signer=False, is_writable=True),
+            AccountMeta(pubkey=params.to_pubkey, is_signer=False, is_writable=True),
+        ],
+        program_id=Pubkey.default(),
+        data=data,
+    )
+
+    return Transaction(fee_payer=params.stake_pubkey).add(withdraw_instruction)
+
+
+def create_account_and_delegate_stake(
+    params: Union[CreateAccountAndDelegateStakeParams, CreateAccountWithSeedAndDelegateStakeParams]
+) -> Transaction:
+    """Generate a transaction to crate and delegate a stake account."""
+    initialize_stake_instruction = initialize_stake(
+        InitializeStakeParams(
+            stake_pubkey=params.stake_pubkey,
+            authorized=params.authorized,
+            lockup=params.lockup,
+        )
+    )
+
+    create_account_instruction = _create_stake_account_instruction(params=params)
+
+    delegate_stake_instruction = delegate_stake(
+        DelegateStakeParams(
+            stake_pubkey=params.stake_pubkey,
+            authorized_pubkey=params.authorized.staker,
+            vote_pubkey=params.vote_pubkey,
+        )
+    )
+
+    return Transaction(fee_payer=params.from_pubkey).add(
+        create_account_instruction, initialize_stake_instruction, delegate_stake_instruction
+    )
+
+
+def delegate_stake(params: DelegateStakeParams) -> Instruction:
+    """Generate an instruction to delete a Stake account."""
+    data = STAKE_INSTRUCTIONS_LAYOUT.build(
+        {"instruction_type": StakeInstructionType.DELEGATE_STAKE_ACCOUNT, "args": {}}
+    )
+    return Instruction(
+        accounts=[
+            AccountMeta(pubkey=params.stake_pubkey, is_signer=False, is_writable=True),
+            AccountMeta(pubkey=params.vote_pubkey, is_signer=False, is_writable=False),
+            AccountMeta(pubkey=sysvar.CLOCK, is_signer=False, is_writable=False),
+            AccountMeta(pubkey=sysvar.STAKE_HISTORY, is_signer=False, is_writable=False),
+            AccountMeta(pubkey=STAKE_CONFIG_PUBKEY, is_signer=False, is_writable=False),
+            AccountMeta(pubkey=params.authorized_pubkey, is_signer=True, is_writable=False),
+        ],
+        program_id=STAKE_PUBKEY,
+        data=data,
+    )
+
+
+def initialize_stake(params: InitializeStakeParams) -> Instruction:
+    """Initialize stake."""
+    data = STAKE_INSTRUCTIONS_LAYOUT.build(
+        {
+            "instruction_type": StakeInstructionType.INITIALIZE_STAKE_ACCOUNT,
+            "args": {
+                "authorized": {
+                    "staker": params.authorized.staker.__bytes__(),
+                    "withdrawer": params.authorized.withdrawer.__bytes__(),
+                },
+                "lockup": {
+                    "unix_timestamp": params.lockup.unix_timestamp,
+                    "epoch": params.lockup.epoch,
+                    "custodian": params.lockup.custodian.__bytes__(),
+                },
+            },
+        }
+    )
+
+    return Instruction(
+        accounts=[
+            AccountMeta(pubkey=params.stake_pubkey, is_signer=False, is_writable=True),
+            AccountMeta(pubkey=sysvar.RENT, is_signer=False, is_writable=False),
+        ],
+        program_id=STAKE_PUBKEY,
+        data=data,
+    )
+
+
+def _create_stake_account_instruction(
+    params: Union[
+        CreateStakeAccountParams,
+        CreateStakeAccountWithSeedParams,
+        CreateAccountAndDelegateStakeParams,
+        CreateAccountWithSeedAndDelegateStakeParams,
+    ]
+) -> Instruction:
+    if isinstance(params, (CreateAccountAndDelegateStakeParams, CreateStakeAccountParams)):
+        return create_account(
+            CreateAccountParams(
+                from_pubkey=params.from_pubkey,
+                to_pubkey=params.stake_pubkey,
+                lamports=params.lamports,
+                space=200,
+                owner=STAKE_PUBKEY,
+            )
+        )
+    return create_account_with_seed(
+        CreateAccountWithSeedParams(
+            from_pubkey=params.from_pubkey,
+            to_pubkey=params.stake_pubkey,
+            base=params.base_pubkey,
+            seed=params.seed,
+            lamports=params.lamports,
+            space=200,
+            owner=STAKE_PUBKEY,
+        )
+    )
+
+
+def create_stake_account(params: Union[CreateStakeAccountParams, CreateStakeAccountWithSeedParams]) -> Transaction:
+    """Generate a Transaction that creates a new Staking Account."""
+    initialize_stake_instruction = initialize_stake(
+        InitializeStakeParams(
+            stake_pubkey=params.stake_pubkey,
+            authorized=params.authorized,
+            lockup=params.lockup,
+        )
+    )
+
+    create_account_instruction = _create_stake_account_instruction(params=params)
+
+    return Transaction(fee_payer=params.from_pubkey).add(create_account_instruction, initialize_stake_instruction)