Add logging for the VST3 plugin

src/common/logging/vst3.cpp

@@ -16,4 +16,28 @@
 
 #include "vst3.h"
 
+#include <sstream>
+
+// TODO: Reconsider the output format
+// TODO: Maybe think of an alterantive that's a little less boilerplaty
+
 Vst3Logger::Vst3Logger(Logger& generic_logger) : logger(generic_logger) {}
+
+void Vst3Logger::log_request(bool is_host_vst, const WantsConfiguration&) {
+    if (BOOST_UNLIKELY(logger.verbosity >= Logger::Verbosity::most_events)) {
+        std::ostringstream message;
+        message << get_log_prefix(is_host_vst)
+                << " >> Requesting <Configuration>";
+
+        log(message.str());
+    }
+}
+
+void Vst3Logger::log_response(bool is_host_vst, const Configuration&) {
+    if (BOOST_UNLIKELY(logger.verbosity >= Logger::Verbosity::most_events)) {
+        std::ostringstream message;
+        message << get_log_prefix(is_host_vst) << "    <Configuration>";
+
+        log(message.str());
+    }
+}

src/common/logging/vst3.h

@@ -16,6 +16,7 @@
 
 #pragma once
 
+#include "../serialization/vst3.h"
 #include "common.h"
 
 /**
@@ -37,7 +38,24 @@ class Vst3Logger {
      */
     inline void log_trace(const std::string& message) { logger.log(message); }
 
-    // TODO: Logging interface for VST3 plugins
+    // For every object we send using `Vst3MessageHandler` we have overloads
+    // that print information about the request and the response. The boolean
+    // flag here indicates whether the request was initiated on the host side
+    // (what we'll call a control message).
+
+    void log_request(bool is_host_vst, const WantsConfiguration&);
+
+    void log_response(bool is_host_vst, const Configuration&);
 
     Logger& logger;
+
+   private:
+    /**
+     * Get the `host -> vst` or `vst -> host` prefix based on the boolean flag
+     * we pass to every logging function so we don't have to repeat it
+     * everywhere.
+     */
+    inline std::string get_log_prefix(bool is_host_vst) {
+        return is_host_vst ? "[host -> vst]" : "[vst -> host]";
+    }
 };