Log: new logging library API

Prepare to migrate away from GLib.  Currently, we're still using GLib
as a backend.

src/playlist/AsxPlaylistPlugin.cxx

@@ -25,14 +25,15 @@
 #include "Song.hxx"
 #include "tag/Tag.hxx"
 #include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
 
 #include <glib.h>
 
 #include <assert.h>
 #include <string.h>
 
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "asx"
+static constexpr Domain asx_domain("asx");
 
 /**
  * This is the state object for the GLib XML parser.
@@ -224,7 +225,7 @@ asx_open_stream(struct input_stream *is)
 		if (nbytes == 0) {
 			if (error2.IsDefined()) {
 				g_markup_parse_context_free(context);
-				g_warning("%s", error2.GetMessage());
+				LogError(error2);
 				return NULL;
 			}
 
@@ -234,7 +235,8 @@ asx_open_stream(struct input_stream *is)
 		success = g_markup_parse_context_parse(context, buffer, nbytes,
 						       &error);
 		if (!success) {
-			g_warning("XML parser failed: %s", error->message);
+			FormatErrno(asx_domain,
+				    "XML parser failed: %s", error->message);
 			g_error_free(error);
 			g_markup_parse_context_free(context);
 			return NULL;
@@ -243,7 +245,8 @@ asx_open_stream(struct input_stream *is)
 
 	success = g_markup_parse_context_end_parse(context, &error);
 	if (!success) {
-		g_warning("XML parser failed: %s", error->message);
+		FormatErrno(asx_domain,
+			    "XML parser failed: %s", error->message);
 		g_error_free(error);
 		g_markup_parse_context_free(context);
 		return NULL;

src/playlist/CuePlaylistPlugin.cxx

@@ -29,9 +29,6 @@
 #include <assert.h>
 #include <string.h>
 
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "cue"
-
 class CuePlaylist final : public SongEnumerator {
 	struct input_stream *is;
 	TextInputStream tis;

src/playlist/DespotifyPlaylistPlugin.cxx

@@ -24,13 +24,12 @@
 #include "MemorySongEnumerator.hxx"
 #include "tag/Tag.hxx"
 #include "Song.hxx"
+#include "Log.hxx"
 
 extern "C" {
 #include <despotify.h>
 }
 
-#include <glib.h>
-
 #include <string.h>
 #include <stdlib.h>
 
@@ -48,7 +47,8 @@ add_song(std::forward_list<SongPointer> &songs, struct ds_track *track)
 
 	if (despotify_track_to_uri(track, ds_uri) != ds_uri) {
 		/* Should never really fail, but let's be sure */
-		g_debug("Can't add track %s\n", track->title);
+		FormatDebug(despotify_domain,
+			    "Can't add track %s", track->title);
 		return;
 	}
 
@@ -99,7 +99,7 @@ despotify_playlist_open_uri(const char *url,
 	ds_link *link =
 		despotify_link_from_uri(url + strlen(despotify_playlist_plugin.schemes[0]) + 3);
 	if (link == nullptr) {
-		g_debug("Can't find %s\n", url);
+		FormatDebug(despotify_domain, "Can't find %s\n", url);
 		return nullptr;
 	}
 

src/playlist/EmbeddedCuePlaylistPlugin.cxx

@@ -39,9 +39,6 @@
 #include <assert.h>
 #include <string.h>
 
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "cue"
-
 class EmbeddedCuePlaylist final : public SongEnumerator {
 public:
 	/**

src/playlist/PlsPlaylistPlugin.cxx

@@ -25,11 +25,15 @@
 #include "Song.hxx"
 #include "tag/Tag.hxx"
 #include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
 
 #include <glib.h>
 
 #include <string>
 
+static constexpr Domain pls_domain("pls");
+
 static void
 pls_parser(GKeyFile *keyfile, std::forward_list<SongPointer> &songs)
 {
@@ -40,7 +44,8 @@ pls_parser(GKeyFile *keyfile, std::forward_list<SongPointer> &songs)
 	int num_entries = g_key_file_get_integer(keyfile, "playlist",
 						 "NumberOfEntries", &error);
 	if (error) {
-		g_debug("Invalid PLS file: '%s'", error->message);
+		FormatError(pls_domain,
+			    "Invalid PLS file: '%s'", error->message);
 		g_error_free(error);
 		error = NULL;
 
@@ -59,7 +64,8 @@ pls_parser(GKeyFile *keyfile, std::forward_list<SongPointer> &songs)
 		value = g_key_file_get_string(keyfile, "playlist", key,
 					      &error);
 		if(error) {
-			g_debug("Invalid PLS entry %s: '%s'",key, error->message);
+			FormatError(pls_domain, "Invalid PLS entry %s: '%s'",
+				    key, error->message);
 			g_error_free(error);
 			g_free(key);
 			return;
@@ -118,7 +124,7 @@ pls_open_stream(struct input_stream *is)
 		nbytes = is->LockRead(buffer, sizeof(buffer), error2);
 		if (nbytes == 0) {
 			if (error2.IsDefined()) {
-				g_warning("%s", error2.GetMessage());
+				LogError(error2);
 				return NULL;
 			}
 
@@ -130,7 +136,7 @@ pls_open_stream(struct input_stream *is)
 	} while (kf_data.length() < 65536);
 
 	if (kf_data.empty()) {
-		g_warning("KeyFile parser failed: No Data");
+		LogWarning(pls_domain, "KeyFile parser failed: No Data");
 		return NULL;
 	}
 
@@ -140,7 +146,8 @@ pls_open_stream(struct input_stream *is)
 					    G_KEY_FILE_NONE, &error);
 
 	if (!success) {
-		g_warning("KeyFile parser failed: %s", error->message);
+		FormatError(pls_domain,
+			    "KeyFile parser failed: %s", error->message);
 		g_error_free(error);
 		g_key_file_free(keyfile);
 		return NULL;

src/playlist/RssPlaylistPlugin.cxx

@@ -25,14 +25,15 @@
 #include "Song.hxx"
 #include "tag/Tag.hxx"
 #include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
 
 #include <glib.h>
 
 #include <assert.h>
 #include <string.h>
 
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "rss"
+static constexpr Domain rss_domain("rss");
 
 /**
  * This is the state object for the GLib XML parser.
@@ -221,7 +222,7 @@ rss_open_stream(struct input_stream *is)
 		if (nbytes == 0) {
 			if (error2.IsDefined()) {
 				g_markup_parse_context_free(context);
-				g_warning("%s", error2.GetMessage());
+				LogError(error2);
 				return NULL;
 			}
 
@@ -231,7 +232,8 @@ rss_open_stream(struct input_stream *is)
 		success = g_markup_parse_context_parse(context, buffer, nbytes,
 						       &error);
 		if (!success) {
-			g_warning("XML parser failed: %s", error->message);
+			FormatError(rss_domain,
+				    "XML parser failed: %s", error->message);
 			g_error_free(error);
 			g_markup_parse_context_free(context);
 			return NULL;
@@ -240,7 +242,8 @@ rss_open_stream(struct input_stream *is)
 
 	success = g_markup_parse_context_end_parse(context, &error);
 	if (!success) {
-		g_warning("XML parser failed: %s", error->message);
+		FormatError(rss_domain,
+			    "XML parser failed: %s", error->message);
 		g_error_free(error);
 		g_markup_parse_context_free(context);
 		return NULL;

src/playlist/SoundCloudPlaylistPlugin.cxx

@@ -26,6 +26,8 @@
 #include "Song.hxx"
 #include "tag/Tag.hxx"
 #include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
 
 #include <glib.h>
 #include <yajl/yajl_parse.h>
@@ -36,13 +38,16 @@ static struct {
 	char *apikey;
 } soundcloud_config;
 
+static constexpr Domain soundcloud_domain("soundcloud");
+
 static bool
 soundcloud_init(const config_param &param)
 {
 	soundcloud_config.apikey = param.DupBlockString("apikey");
 	if (soundcloud_config.apikey == NULL) {
-		g_debug("disabling the soundcloud playlist plugin "
-			"because API key is not set");
+		LogDebug(soundcloud_domain,
+			 "disabling the soundcloud playlist plugin "
+			 "because API key is not set");
 		return false;
 	}
 
@@ -254,7 +259,7 @@ soundcloud_parse_json(const char *url, yajl_handle hand,
 							error);
 	if (input_stream == NULL) {
 		if (error.IsDefined())
-			g_warning("%s", error.GetMessage());
+			LogError(error);
 		return -1;
 	}
 
@@ -269,7 +274,7 @@ soundcloud_parse_json(const char *url, yajl_handle hand,
 			input_stream->Read(buffer, sizeof(buffer), error);
 		if (nbytes == 0) {
 			if (error.IsDefined())
-				g_warning("%s", error.GetMessage());
+				LogError(error);
 
 			if (input_stream->IsEOF()) {
 				done = true;
@@ -296,7 +301,7 @@ soundcloud_parse_json(const char *url, yajl_handle hand,
 		    )
 		{
 			unsigned char *str = yajl_get_error(hand, 1, ubuffer, nbytes);
-			g_warning("%s", str);
+			LogError(soundcloud_domain, (const char *)str);
 			yajl_free_error(hand, str);
 			break;
 		}
@@ -341,7 +346,9 @@ soundcloud_open_uri(const char *uri, Mutex &mutex, Cond &cond)
 	rest = p;
 
 	if (strcmp(scheme, "soundcloud") != 0) {
-		g_warning("incompatible scheme for soundcloud plugin: %s", scheme);
+		FormatWarning(soundcloud_domain,
+			      "incompatible scheme for soundcloud plugin: %s",
+			      scheme);
 		g_free(s);
 		return NULL;
 	}
@@ -361,7 +368,7 @@ soundcloud_open_uri(const char *uri, Mutex &mutex, Cond &cond)
 	g_free(s);
 
 	if (u == NULL) {
-		g_warning("unknown soundcloud URI");
+		LogWarning(soundcloud_domain, "unknown soundcloud URI");
 		return NULL;
 	}
 

src/playlist/XspfPlaylistPlugin.cxx

@@ -24,14 +24,15 @@
 #include "InputStream.hxx"
 #include "tag/Tag.hxx"
 #include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
 
 #include <glib.h>
 
 #include <assert.h>
 #include <string.h>
 
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "xspf"
+static constexpr Domain xspf_domain("xspf");
 
 /**
  * This is the state object for the GLib XML parser.
@@ -240,7 +241,7 @@ xspf_open_stream(struct input_stream *is)
 		if (nbytes == 0) {
 			if (error2.IsDefined()) {
 				g_markup_parse_context_free(context);
-				g_warning("%s", error2.GetMessage());
+				LogError(error2);
 				return NULL;
 			}
 
@@ -250,7 +251,8 @@ xspf_open_stream(struct input_stream *is)
 		success = g_markup_parse_context_parse(context, buffer, nbytes,
 						       &error);
 		if (!success) {
-			g_warning("XML parser failed: %s", error->message);
+			FormatError(xspf_domain,
+				    "XML parser failed: %s", error->message);
 			g_error_free(error);
 			g_markup_parse_context_free(context);
 			return NULL;
@@ -259,7 +261,8 @@ xspf_open_stream(struct input_stream *is)
 
 	success = g_markup_parse_context_end_parse(context, &error);
 	if (!success) {
-		g_warning("XML parser failed: %s", error->message);
+		FormatError(xspf_domain,
+			    "XML parser failed: %s", error->message);
 		g_error_free(error);
 		g_markup_parse_context_free(context);
 		return NULL;