Merge #12729: Get rid of ambiguous OutputType::NONE value

1e46d8a Get rid of ambiguous OutputType::NONE value (Russell Yanofsky)

Pull request description:

  Based on suggestion by @sipa https://github.com/bitcoin/bitcoin/pull/12119#issuecomment-357982763

  After #12119, the NONE output type was overloaded to refer to either an output type that couldn't be parsed, or to an automatic change output mode.  This change drops the NONE enum and uses a simple bool to indicate parse failure, and a new CHANGE_AUTO enum to refer the change output type.

  This change is almost a pure refactoring except it makes RPCs reject empty string ("") address types instead of treating them like they were unset. This simplifies the parsing code a little bit and could prevent RPC usage mistakes. It's noted in the release notes.

  Follows up #12408 by @MarcoFalke

  Followups for future PRs:

  - [ ] Add explicit support for specifying "auto" in `ParseOutputType` as suggested by promag and sipa: https://github.com/bitcoin/bitcoin/pull/12729#issuecomment-374799567 and https://github.com/bitcoin/bitcoin/pull/12729#discussion_r175969481
  - [ ] Add wallet `AddressChangeType` method to complement `TransactionChangeType`:  https://github.com/bitcoin/bitcoin/pull/12729#discussion_r175969618.

Tree-SHA512: 8b08b272bcb177a0a9e556dcd965840a7fe601ef83ca97938b879c9b1a33b5b3f96939e1bceef11ba7c644ac21bfd6c1dbc6ca715cd1da4ace50475240e4ee48

1 files changed, 6 insertions, 9 deletions

diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index a82f069490..bfd9840dfc 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -164,8 +164,7 @@ UniValue getnewaddress(const JSONRPCRequest& request)
 
     OutputType output_type = pwallet->m_default_address_type;
     if (!request.params[1].isNull()) {
-        output_type = ParseOutputType(request.params[1].get_str(), pwallet->m_default_address_type);
-        if (output_type == OutputType::NONE) {
+        if (!ParseOutputType(request.params[1].get_str(), output_type)) {
             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Unknown address type '%s'", request.params[1].get_str()));
         }
     }
@@ -282,10 +281,9 @@ UniValue getrawchangeaddress(const JSONRPCRequest& request)
         pwallet->TopUpKeyPool();
     }
 
-    OutputType output_type = pwallet->m_default_change_type != OutputType::NONE ? pwallet->m_default_change_type : pwallet->m_default_address_type;
+    OutputType output_type = pwallet->m_default_change_type != OutputType::CHANGE_AUTO ? pwallet->m_default_change_type : pwallet->m_default_address_type;
     if (!request.params[0].isNull()) {
-        output_type = ParseOutputType(request.params[0].get_str(), output_type);
-        if (output_type == OutputType::NONE) {
+        if (!ParseOutputType(request.params[0].get_str(), output_type)) {
             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Unknown address type '%s'", request.params[0].get_str()));
         }
     }
@@ -1317,8 +1315,7 @@ UniValue addmultisigaddress(const JSONRPCRequest& request)
 
     OutputType output_type = pwallet->m_default_address_type;
     if (!request.params[3].isNull()) {
-        output_type = ParseOutputType(request.params[3].get_str(), output_type);
-        if (output_type == OutputType::NONE) {
+        if (!ParseOutputType(request.params[3].get_str(), output_type)) {
             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Unknown address type '%s'", request.params[3].get_str()));
         }
     }
@@ -3317,8 +3314,8 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
             if (options.exists("changeAddress")) {
                 throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot specify both changeAddress and address_type options");
             }
-            coinControl.m_change_type = ParseOutputType(options["change_type"].get_str(), pwallet->m_default_change_type);
-            if (coinControl.m_change_type == OutputType::NONE) {
+            coinControl.m_change_type = pwallet->m_default_change_type;
+            if (!ParseOutputType(options["change_type"].get_str(), *coinControl.m_change_type)) {
                 throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Unknown change type '%s'", options["change_type"].get_str()));
             }
         }