multiprocess: Add type conversion code for UniValue types

Extend IPC unit test to cover this and verify the serialization happens
correctly.

3 files changed, 9 insertions, 0 deletions

diff --git a/src/test/ipc_test.capnp b/src/test/ipc_test.capnp
index 7b970e2aff..55a3dc2683 100644
--- a/src/test/ipc_test.capnp
+++ b/src/test/ipc_test.capnp
@@ -14,4 +14,5 @@ $Proxy.includeTypes("ipc/capnp/common-types.h");
 interface FooInterface $Proxy.wrap("FooImplementation") {
     add @0 (a :Int32, b :Int32) -> (result :Int32);
     passOutPoint @1 (arg :Data) -> (result :Data);
+    passUniValue @2 (arg :Text) -> (result :Text);
 }
diff --git a/src/test/ipc_test.cpp b/src/test/ipc_test.cpp
index f835859705..ce4edaceb0 100644
--- a/src/test/ipc_test.cpp
+++ b/src/test/ipc_test.cpp
@@ -55,6 +55,12 @@ void IpcTest()
     COutPoint txout2{foo->passOutPoint(txout1)};
     BOOST_CHECK(txout1 == txout2);
 
+    UniValue uni1{UniValue::VOBJ};
+    uni1.pushKV("i", 1);
+    uni1.pushKV("s", "two");
+    UniValue uni2{foo->passUniValue(uni1)};
+    BOOST_CHECK_EQUAL(uni1.write(), uni2.write());
+
     // Test cleanup: disconnect pipe and join thread
     disconnect_client();
     thread.join();
diff --git a/src/test/ipc_test.h b/src/test/ipc_test.h
index f100ae8c5d..bcfcc2125c 100644
--- a/src/test/ipc_test.h
+++ b/src/test/ipc_test.h
@@ -6,12 +6,14 @@
 #define BITCOIN_TEST_IPC_TEST_H
 
 #include <primitives/transaction.h>
+#include <univalue.h>
 
 class FooImplementation
 {
 public:
     int add(int a, int b) { return a + b; }
     COutPoint passOutPoint(COutPoint o) { return o; }
+    UniValue passUniValue(UniValue v) { return v; }
 };
 
 void IpcTest();