Merge pull request #6425 from yorickvP/fix-6424

Add custom to_json and from_json functions for ExperimentalFeature

src/libutil/experimental-features.cc

@@ -58,4 +58,18 @@ std::ostream & operator <<(std::ostream & str, const ExperimentalFeature & featu
     return str << showExperimentalFeature(feature);
 }
 
+void to_json(nlohmann::json& j, const ExperimentalFeature& feature) {
+    j = showExperimentalFeature(feature);
+}
+
+void from_json(const nlohmann::json& j, ExperimentalFeature& feature) {
+    const std::string input = j;
+    const auto parsed = parseExperimentalFeature(input);
+
+    if (parsed.has_value())
+        feature = *parsed;
+    else
+        throw Error("Unknown experimental feature '%s' in JSON input", input);
+}
+
 }

src/libutil/experimental-features.hh

@@ -51,4 +51,11 @@ public:
     MissingExperimentalFeature(ExperimentalFeature);
 };
 
+/**
+ * Semi-magic conversion to and from json.
+ * See the nlohmann/json readme for more details.
+ */
+void to_json(nlohmann::json&, const ExperimentalFeature&);
+void from_json(const nlohmann::json&, ExperimentalFeature&);
+
 }