Merge #16503: Remove p2pEnabled from Chain interface

b7b9f6e4cee262004643e2fe03d56cb47fdbf5c2 Remove p2pEnabled from Chain interface (Antoine Riard)

Pull request description:

  RPC server starts in warmup mode, it can't process yet calls, then follows connection manager initialization and finally RPC server get out of warmup mode. RPC calls shouldn't be able to get P2P disabled errors because once we initialize g_connman it's not unset until shutdown, after RPC server has been stopped.

  @mzumsande comment in #15713 let me thought that `p2pEnabled` was maybe useless, `g_connman` is always initialized before RPC server is getting out of warmup. These checks against P2P state were introduced in https://github.com/bitcoin/bitcoin/pull/8085/commits/5b446dd5b11d4f403554bc2dd5a7a94c7d20422a.

ACKs for top commit:
  promag:
    ACK b7b9f6e4cee262004643e2fe03d56cb47fdbf5c2
  jnewbery:
    ACK b7b9f6e4cee262004643e2fe03d56cb47fdbf5c2

Tree-SHA512: 4de2b9fc496bf8347ff5cc645848a5a44c8ca7596cd134f17f3088f5f8262d1d88b8e2a052df93e309ec9a81956a808df17a9eb9f10d4f4d693c95d607fe3561

4 files changed, 3 insertions, 12 deletions

diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index 1ad4308f29..b8b9ecded9 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -332,7 +332,6 @@ public:
         LOCK(cs_main);
         return ::fHavePruned;
     }
-    bool p2pEnabled() override { return g_connman != nullptr; }
     bool isReadyToBroadcast() override { return !::fImporting && !::fReindex && !isInitialBlockDownload(); }
     bool isInitialBlockDownload() override { return ::ChainstateActive().IsInitialBlockDownload(); }
     bool shutdownRequested() override { return ShutdownRequested(); }
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index 1d6ed05522..da670a3370 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -187,9 +187,6 @@ public:
     //! Check if any block has been pruned.
     virtual bool havePruned() = 0;
 
-    //! Check if p2p enabled.
-    virtual bool p2pEnabled() = 0;
-
     //! Check if the node is ready to broadcast transactions.
     virtual bool isReadyToBroadcast() = 0;
 
diff --git a/src/node/transaction.cpp b/src/node/transaction.cpp
index 8e56496358..a28136a8e8 100644
--- a/src/node/transaction.cpp
+++ b/src/node/transaction.cpp
@@ -16,6 +16,9 @@
 
 TransactionError BroadcastTransaction(const CTransactionRef tx, std::string& err_string, const CAmount& max_tx_fee, bool relay, bool wait_callback)
 {
+    // BroadcastTransaction can be called by either sendrawtransaction RPC or wallet RPCs.
+    // g_connman is assigned both before chain clients and before RPC server is accepting calls,
+    // and reset after chain clients and RPC sever are stopped. g_connman should never be null here.
     assert(g_connman);
     std::promise<void> promise;
     uint256 hashTx = tx->GetHash();
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index f94214b6ee..cbab73d612 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -309,10 +309,6 @@ static CTransactionRef SendMoney(interfaces::Chain::Lock& locked_chain, CWallet
     if (nValue > curBalance)
         throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, "Insufficient funds");
 
-    if (pwallet->GetBroadcastTransactions() && !pwallet->chain().p2pEnabled()) {
-        throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled");
-    }
-
     // Parse Bitcoin address
     CScript scriptPubKey = GetScriptForDestination(address);
 
@@ -845,10 +841,6 @@ static UniValue sendmany(const JSONRPCRequest& request)
     auto locked_chain = pwallet->chain().lock();
     LOCK(pwallet->cs_wallet);
 
-    if (pwallet->GetBroadcastTransactions() && !pwallet->chain().p2pEnabled()) {
-        throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled");
-    }
-
     if (!request.params[0].isNull() && !request.params[0].get_str().empty()) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Dummy value must be set to \"\"");
     }