Merge #10931: Fix misleading "Method not found" multiwallet errors

df389bc Change wallet method disabled error text (Russell Yanofsky)
e526b3d Fix misleading "Method not found" multiwallet errors (Russell Yanofsky)

Pull request description:

  Raise RPC_WALLET_NOT_SPECIFIED instead of RPC_METHOD_NOT_FOUND when a required
  wallet filename was not specified in an RPC call.

  Also raise more specific RPC_WALLET_NOT_FOUND error instead of
  RPC_INVALID_PARAMETER in case an invalid wallet was specified, for consistency.

Tree-SHA512: 6a8d885283f69bcfc28f2e08ac03eff02f9f8160a312ce2a90d868aa52533434fc0b4c4ab86547c2f09392338956df915637eaf7136a4fc105e6c8179f2d0ac8

3 files changed, 20 insertions, 8 deletions

diff --git a/src/bitcoin-cli.cpp b/src/bitcoin-cli.cpp
index 445b9d8e89..c1a7c927e3 100644
--- a/src/bitcoin-cli.cpp
+++ b/src/bitcoin-cli.cpp
@@ -337,6 +337,10 @@ int CommandLineRPC(int argc, char *argv[])
 
                         if (errMsg.isStr())
                             strPrint += "error message:\n"+errMsg.get_str();
+
+                        if (errCode.isNum() && errCode.get_int() == RPC_WALLET_NOT_SPECIFIED) {
+                            strPrint += "\nTry adding \"-rpcwallet=<filename>\" option to bitcoin-cli command line.";
+                        }
                     }
                 } else {
                     // Result
diff --git a/src/rpc/protocol.h b/src/rpc/protocol.h
index 70f7092cfe..4bd4702d62 100644
--- a/src/rpc/protocol.h
+++ b/src/rpc/protocol.h
@@ -82,6 +82,8 @@ enum RPCErrorCode
     RPC_WALLET_WRONG_ENC_STATE      = -15, //!< Command given in wrong wallet encryption state (encrypting an encrypted wallet etc.)
     RPC_WALLET_ENCRYPTION_FAILED    = -16, //!< Failed to encrypt the wallet
     RPC_WALLET_ALREADY_UNLOCKED     = -17, //!< Wallet is already unlocked
+    RPC_WALLET_NOT_FOUND            = -18, //!< Invalid wallet specified
+    RPC_WALLET_NOT_SPECIFIED        = -19, //!< No wallet specified (error when there are multiple wallets loaded)
 };
 
 UniValue JSONRPCRequestObj(const std::string& strMethod, const UniValue& params, const UniValue& id);
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index e956adaf89..14560860cb 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -43,7 +43,7 @@ CWallet *GetWalletForJSONRPCRequest(const JSONRPCRequest& request)
                 return pwallet;
             }
         }
-        throw JSONRPCError(RPC_INVALID_PARAMETER, "Requested wallet does not exist or is not loaded");
+        throw JSONRPCError(RPC_WALLET_NOT_FOUND, "Requested wallet does not exist or is not loaded");
     }
     return ::vpwallets.size() == 1 || (request.fHelp && ::vpwallets.size() > 0) ? ::vpwallets[0] : nullptr;
 }
@@ -57,13 +57,19 @@ std::string HelpRequiringPassphrase(CWallet * const pwallet)
 
 bool EnsureWalletIsAvailable(CWallet * const pwallet, bool avoidException)
 {
-    if (!pwallet) {
-        if (!avoidException)
-            throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Method not found (disabled)");
-        else
-            return false;
-    }
-    return true;
+    if (pwallet) return true;
+    if (avoidException) return false;
+    if (::vpwallets.empty()) {
+        // Note: It isn't currently possible to trigger this error because
+        // wallet RPC methods aren't registered unless a wallet is loaded. But
+        // this error is being kept as a precaution, because it's possible in
+        // the future that wallet RPC methods might get or remain registered
+        // when no wallets are loaded.
+        throw JSONRPCError(
+            RPC_METHOD_NOT_FOUND, "Method not found (wallet method is disabled because no wallet is loaded)");
+    }
+    throw JSONRPCError(RPC_WALLET_NOT_SPECIFIED,
+        "Wallet file not specified (must request wallet RPC through /wallet/<filename> uri-path).");
 }
 
 void EnsureWalletIsUnlocked(CWallet * const pwallet)