Merge bitcoin/bitcoin#29954: RPC: Return permitbaremultisig and maxdatacarriersize in getmempoolinfo

1c10b7351e RPC: Return permitbaremultisig and maxdatacarriersize in getmempoolinfo (Kristaps Kaupe)

Pull request description:

  Other node relay settings like `fullrbf` and `minrelaytxfee` are already returned, makes sense to add these two too.

ACKs for top commit:
  ajtowns:
    ACK 1c10b7351e
  maflcko:
    lgtm ACK 1c10b7351e
  theStack:
    ACK 1c10b7351e

Tree-SHA512: 1750d7d12de511f0ac34922ea9c58c4b9b55c3aaf22109abfd7dbe01ad1eb7b48fb4a6b074a0baf0e55ee2270fcc969b6830e499ff33adbcd0b9c761fb25e563

src/rpc/mempool.cpp

@@ -691,6 +691,8 @@ UniValue MempoolInfoToJSON(const CTxMemPool& pool)
     ret.pushKV("incrementalrelayfee", ValueFromAmount(pool.m_opts.incremental_relay_feerate.GetFeePerK()));
     ret.pushKV("unbroadcastcount", uint64_t{pool.GetUnbroadcastTxs().size()});
     ret.pushKV("fullrbf", true);
+    ret.pushKV("permitbaremultisig", pool.m_opts.permit_bare_multisig);
+    ret.pushKV("maxdatacarriersize", pool.m_opts.max_datacarrier_bytes.value_or(0));
     return ret;
 }
 
@@ -713,6 +715,8 @@ static RPCHelpMan getmempoolinfo()
                 {RPCResult::Type::NUM, "incrementalrelayfee", "minimum fee rate increment for mempool limiting or replacement in " + CURRENCY_UNIT + "/kvB"},
                 {RPCResult::Type::NUM, "unbroadcastcount", "Current number of transactions that haven't passed initial broadcast yet"},
                 {RPCResult::Type::BOOL, "fullrbf", "True if the mempool accepts RBF without replaceability signaling inspection (DEPRECATED)"},
+                {RPCResult::Type::BOOL, "permitbaremultisig", "True if the mempool accepts transactions with bare multisig outputs"},
+                {RPCResult::Type::NUM, "maxdatacarriersize", "Maximum number of bytes that can be used by OP_RETURN outputs in the mempool"},
             }},
         RPCExamples{
             HelpExampleCli("getmempoolinfo", "")

test/functional/mempool_accept.py

@@ -78,6 +78,8 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
         node = self.nodes[0]
         self.wallet = MiniWallet(node)
 
+        assert_equal(node.getmempoolinfo()['permitbaremultisig'], False)
+
         self.log.info('Start with empty mempool, and 200 blocks')
         self.mempool_size = 0
         assert_equal(node.getblockcount(), 200)

test/functional/mempool_datacarrier.py

@@ -13,7 +13,10 @@ from test_framework.script import (
 )
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.test_node import TestNode
-from test_framework.util import assert_raises_rpc_error
+from test_framework.util import (
+    assert_equal,
+    assert_raises_rpc_error,
+)
 from test_framework.wallet import MiniWallet
 
 from random import randbytes
@@ -48,6 +51,14 @@ class DataCarrierTest(BitcoinTestFramework):
     def run_test(self):
         self.wallet = MiniWallet(self.nodes[0])
 
+        # Test that bare multisig is allowed by default. Do it here rather than create a new test for it.
+        assert_equal(self.nodes[0].getmempoolinfo()["permitbaremultisig"], True)
+
+        assert_equal(self.nodes[0].getmempoolinfo()["maxdatacarriersize"], MAX_OP_RETURN_RELAY)
+        assert_equal(self.nodes[1].getmempoolinfo()["maxdatacarriersize"], 0)
+        assert_equal(self.nodes[2].getmempoolinfo()["maxdatacarriersize"], CUSTOM_DATACARRIER_ARG)
+        assert_equal(self.nodes[3].getmempoolinfo()["maxdatacarriersize"], 2)
+
         # By default, any size is allowed.
 
         # If it is custom set to 83, the historical value,