Add a dave_set_log_sink function (#9)

Author: KubaZ2

include/libdavec.h

@@ -24,13 +24,13 @@ typedef struct DaveCommitProcessingResult {
     void *roster_update;
 } DaveCommitProcessingResult;
 
-typedef void (*DaveMlsFailureCallback)(const char*, const char*);
-
-typedef void (*DaveProtocolVersionChangedCallback)(void);
-
-LIBDAVEC_EXPORT extern const int DAVE_INIT_TRANSITION_ID;
-
-LIBDAVEC_EXPORT extern const int DAVE_DISABLED_VERSION;
+typedef enum DaveLoggingSeverity {
+    VERBOSE,
+    INFO,
+    WARNING,
+    ERROR,
+    NONE,
+} DaveLoggingSeverity;
 
 typedef enum DaveMediaType : uint8_t {
     AUDIO,
@@ -47,6 +47,18 @@ typedef enum DaveCodec : uint8_t {
     AV1
 } DaveCodec;
 
+typedef void (*DaveLogSink)(DaveLoggingSeverity severity, const char *file, int line, const char *message);
+
+typedef void (*DaveMlsFailureCallback)(const char*, const char*);
+
+typedef void (*DaveProtocolVersionChangedCallback)(void);
+
+LIBDAVEC_EXPORT extern const int DAVE_INIT_TRANSITION_ID;
+
+LIBDAVEC_EXPORT extern const int DAVE_DISABLED_VERSION;
+
+LIBDAVEC_EXPORT void dave_set_log_sink(DaveLogSink sink);
+
 LIBDAVEC_EXPORT uint16_t dave_max_supported_protocol_version(void);
 
 LIBDAVEC_EXPORT void* dave_session_create(const char *context, const char *auth_session_id, DaveMlsFailureCallback mls_failure_callback);

src/libdavec.cpp

@@ -37,6 +37,21 @@ const int DAVE_INIT_TRANSITION_ID = discord::dave::kInitTransitionId;
 
 const int DAVE_DISABLED_VERSION = discord::dave::kDisabledVersion;
 
+void dave_set_log_sink(DaveLogSink sink) {
+    static std::atomic<DaveLogSink> log_sink = nullptr;
+    
+    log_sink.store(sink);
+
+    if (sink) {
+        discord::dave::SetLogSink([](discord::dave::LoggingSeverity severity, const char *file, int line, const std::string &message) {
+            auto stored = log_sink.load();
+            if (stored)
+                stored((DaveLoggingSeverity)severity, file, line, message.c_str());
+        });
+    } else
+        discord::dave::SetLogSink(nullptr);
+}
+
 uint16_t dave_max_supported_protocol_version(void) {
     return discord::dave::MaxSupportedProtocolVersion();
 }