add lido maintenance script

scripts/requirements.txt

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+solana==0.34.3
+solders==0.21.0

scripts/update_exchange_rate.py

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+from solana.rpc.api import Client
+from solders import sysvar
+from solders.instruction import AccountMeta, Instruction
+from solders.keypair import Keypair
+from solders.pubkey import Pubkey
+from solders.transaction import Transaction
+
+# need abs path for this
+PAYER_PATH = "/TODO/PATH/TO.JSON"
+
+RPC = "https://api.mainnet-beta.solana.com"
+
+LIDO_PROGRAM_ID = Pubkey.from_string("CrX7kMhLC3cSsXJdT7JDgqrRVWGnUpX3gfEfxxU2NVLi")
+
+LIDO_STATE = Pubkey.from_string("49Yi1TKkNyYjPAFdR9LBvoHcUjuPX4Df5T5yv39w2XTn")
+LIDO_RESERVE = Pubkey.from_string("3Kwv3pEAuoe4WevPB4rgMBTZndGDb53XT7qwQKnvHPfX")
+STSOL_MINT = Pubkey.from_string("7dHbWXmci3dT8UFYWYZweBLXgycu7Y3iL6trKn1Y7ARj")
+LIDO_VALIDATOR_LIST = Pubkey.from_string("GL9kqRNUTUosW3RsDoXHCuXUZn73SgQQmBvtp1ng2co4")
+
+UPDATE_EXCHANGE_RATE_V2_IX_DATA = bytes([0x16]) # Note: not 0x17 like in main branch. Refer to V2.1 branch
+
+UPDATE_EXCHANGE_RATE_V2_IX_METAS = [
+    AccountMeta(LIDO_STATE, False, True),
+    AccountMeta(LIDO_RESERVE, False, False),
+    AccountMeta(STSOL_MINT, False, False),
+    AccountMeta(LIDO_VALIDATOR_LIST, False, False),
+    AccountMeta(sysvar.CLOCK, False, False),
+    AccountMeta(sysvar.RENT, False, False),
+]
+
+UPDATE_IX = Instruction(LIDO_PROGRAM_ID, UPDATE_EXCHANGE_RATE_V2_IX_DATA, UPDATE_EXCHANGE_RATE_V2_IX_METAS)
+
+def load_keypair(fname):
+    with open(fname, "r") as f:
+        return Keypair.from_json(f.read())
+
+def make_tx(payer, rbh):
+    return Transaction.new_signed_with_payer(
+        [UPDATE_IX],
+        payer.pubkey(),
+        [payer],
+        rbh,
+    )
+
+if __name__ == "__main__":
+    rpc = Client(RPC)
+    payer = load_keypair(PAYER_PATH)
+
+    rbh = rpc.get_latest_blockhash().value.blockhash
+    tx = make_tx(
+        payer,
+        rbh,
+    )
+    tx_bytes = bytes(tx)
+    sig = rpc.send_raw_transaction(tx_bytes).value
+    print(f"{sig}")
+    rpc.confirm_transaction(sig, commitment="finalized")