input/tidal: parse subStatus in error responses

src/input/plugins/TidalError.hxx

@@ -33,15 +33,25 @@ class TidalError : public std::runtime_error {
 	 */
 	unsigned status;
 
+	/**
+	 * The Tidal-specific "subStatus".  0 if none was found in the
+	 * JSON response.
+	 */
+	unsigned sub_status;
+
 public:
 	template<typename W>
-	TidalError(unsigned _status, W &&_what) noexcept
+	TidalError(unsigned _status, unsigned _sub_status, W &&_what) noexcept
 		:std::runtime_error(std::forward<W>(_what)),
-		 status(_status) {}
+		 status(_status), sub_status(_sub_status) {}
 
 	unsigned GetStatus() const noexcept {
 		return status;
 	}
+
+	unsigned GetSubStatus() const noexcept {
+		return sub_status;
+	}
 };
 
 #endif

src/input/plugins/TidalErrorParser.cxx

@@ -28,7 +28,7 @@ using Wrapper = Yajl::CallbacksWrapper<TidalErrorParser>;
 static constexpr yajl_callbacks tidal_error_parser_callbacks = {
 	nullptr,
 	nullptr,
-	nullptr,
+	Wrapper::Integer,
 	nullptr,
 	nullptr,
 	Wrapper::String,
@@ -62,7 +62,23 @@ TidalErrorParser::OnEnd()
 	else
 		snprintf(what, sizeof(what), "Status %u from Tidal", status);
 
-	throw TidalError(status, what);
+	throw TidalError(status, sub_status, what);
+}
+
+inline bool
+TidalErrorParser::Integer(long long value) noexcept
+{
+	switch (state) {
+	case State::NONE:
+	case State::USER_MESSAGE:
+		break;
+
+	case State::SUB_STATUS:
+		sub_status = value;
+		break;
+	}
+
+	return true;
 }
 
 inline bool
@@ -70,6 +86,7 @@ TidalErrorParser::String(StringView value) noexcept
 {
 	switch (state) {
 	case State::NONE:
+	case State::SUB_STATUS:
 		break;
 
 	case State::USER_MESSAGE:
@@ -85,6 +102,8 @@ TidalErrorParser::MapKey(StringView value) noexcept
 {
 	if (value.Equals("userMessage"))
 		state = State::USER_MESSAGE;
+	else if (value.Equals("subStatus"))
+		state = State::SUB_STATUS;
 	else
 		state = State::NONE;
 

src/input/plugins/TidalErrorParser.hxx

@@ -39,8 +39,11 @@ class TidalErrorParser final : public YajlResponseParser {
 	enum class State {
 		NONE,
 		USER_MESSAGE,
+		SUB_STATUS,
 	} state = State::NONE;
 
+	unsigned sub_status = 0;
+
 	std::string message;
 
 public:
@@ -57,6 +60,7 @@ protected:
 
 public:
 	/* yajl callbacks */
+	bool Integer(long long value) noexcept;
 	bool String(StringView value) noexcept;
 	bool MapKey(StringView value) noexcept;
 	bool EndMap() noexcept;