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Diffstat (limited to 'src/db/ProxyDatabasePlugin.cxx')
| -rw-r--r-- | src/db/ProxyDatabasePlugin.cxx | 482 |
1 files changed, 482 insertions, 0 deletions
diff --git a/src/db/ProxyDatabasePlugin.cxx b/src/db/ProxyDatabasePlugin.cxx new file mode 100644 index 000000000..d36cebcfd --- /dev/null +++ b/src/db/ProxyDatabasePlugin.cxx @@ -0,0 +1,482 @@ +/* + * Copyright (C) 2003-2012 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "ProxyDatabasePlugin.hxx" +#include "DatabasePlugin.hxx" +#include "DatabaseSelection.hxx" +#include "gcc.h" + +extern "C" { +#include "db_error.h" +#include "conf.h" +#include "song.h" +#include "tag.h" +} + +#include "directory.h" +#include "playlist_vector.h" + +#undef MPD_DIRECTORY_H +#undef MPD_SONG_H +#include <mpd/client.h> + +#include <cassert> +#include <string> +#include <list> + +class ProxyDatabase : public Database { + std::string host; + unsigned port; + + struct mpd_connection *connection; + struct directory *root; + +public: + static Database *Create(const struct config_param *param, + GError **error_r); + + virtual bool Open(GError **error_r) override; + virtual void Close() override; + virtual struct song *GetSong(const char *uri_utf8, + GError **error_r) const override; + virtual void ReturnSong(struct song *song) const; + + virtual bool Visit(const DatabaseSelection &selection, + VisitDirectory visit_directory, + VisitSong visit_song, + VisitPlaylist visit_playlist, + GError **error_r) const override; + + virtual bool VisitUniqueTags(const DatabaseSelection &selection, + enum tag_type tag_type, + VisitString visit_string, + GError **error_r) const override; + + virtual bool GetStats(const DatabaseSelection &selection, + DatabaseStats &stats, + GError **error_r) const override; + +protected: + bool Configure(const struct config_param *param, GError **error_r); +}; + +G_GNUC_CONST +static inline GQuark +libmpdclient_quark(void) +{ + return g_quark_from_static_string("libmpdclient"); +} + +static constexpr struct { + enum tag_type d; + enum mpd_tag_type s; +} tag_table[] = { + { TAG_ARTIST, MPD_TAG_ARTIST }, + { TAG_ALBUM, MPD_TAG_ALBUM }, + { TAG_ALBUM_ARTIST, MPD_TAG_ALBUM_ARTIST }, + { TAG_TITLE, MPD_TAG_TITLE }, + { TAG_TRACK, MPD_TAG_TRACK }, + { TAG_NAME, MPD_TAG_NAME }, + { TAG_GENRE, MPD_TAG_GENRE }, + { TAG_DATE, MPD_TAG_DATE }, + { TAG_COMPOSER, MPD_TAG_COMPOSER }, + { TAG_PERFORMER, MPD_TAG_PERFORMER }, + { TAG_COMMENT, MPD_TAG_COMMENT }, + { TAG_DISC, MPD_TAG_DISC }, + { TAG_MUSICBRAINZ_ARTISTID, MPD_TAG_MUSICBRAINZ_ARTISTID }, + { TAG_MUSICBRAINZ_ALBUMID, MPD_TAG_MUSICBRAINZ_ALBUMID }, + { TAG_MUSICBRAINZ_ALBUMARTISTID, + MPD_TAG_MUSICBRAINZ_ALBUMARTISTID }, + { TAG_MUSICBRAINZ_TRACKID, MPD_TAG_MUSICBRAINZ_TRACKID }, + { TAG_NUM_OF_ITEM_TYPES, MPD_TAG_COUNT } +}; + +G_GNUC_CONST +static enum mpd_tag_type +Convert(enum tag_type tag_type) +{ + for (auto i = tag_table; i->d != TAG_NUM_OF_ITEM_TYPES; ++i) + if (i->d == tag_type) + return i->s; + + return MPD_TAG_COUNT; +} + +static bool +CheckError(struct mpd_connection *connection, GError **error_r) +{ + const auto error = mpd_connection_get_error(connection); + if (error == MPD_ERROR_SUCCESS) + return true; + + g_set_error_literal(error_r, libmpdclient_quark(), (int)error, + mpd_connection_get_error_message(connection)); + mpd_connection_clear_error(connection); + return false; +} + +Database * +ProxyDatabase::Create(const struct config_param *param, GError **error_r) +{ + ProxyDatabase *db = new ProxyDatabase(); + if (!db->Configure(param, error_r)) { + delete db; + db = NULL; + } + + return db; +} + +bool +ProxyDatabase::Configure(const struct config_param *param, GError **) +{ + host = config_get_block_string(param, "host", ""); + port = config_get_block_unsigned(param, "port", 0); + + return true; +} + +bool +ProxyDatabase::Open(GError **error_r) +{ + connection = mpd_connection_new(host.empty() ? NULL : host.c_str(), + port, 0); + if (connection == NULL) { + g_set_error_literal(error_r, libmpdclient_quark(), + (int)MPD_ERROR_OOM, "Out of memory"); + return false; + } + + if (!CheckError(connection, error_r)) { + mpd_connection_free(connection); + return false; + } + + root = directory_new_root(); + + return true; +} + +void +ProxyDatabase::Close() +{ + assert(connection != nullptr); + + directory_free(root); + mpd_connection_free(connection); +} + +static song * +Convert(const struct mpd_song *song); + +struct song * +ProxyDatabase::GetSong(const char *uri, GError **error_r) const +{ + // TODO: implement + // TODO: auto-reconnect + + if (!mpd_send_list_meta(connection, uri)) { + CheckError(connection, error_r); + return nullptr; + } + + struct mpd_song *song = mpd_recv_song(connection); + struct song *song2 = song != nullptr + ? Convert(song) + : nullptr; + mpd_song_free(song); + if (!mpd_response_finish(connection)) { + if (song2 != nullptr) + song_free(song2); + + CheckError(connection, error_r); + return nullptr; + } + + if (song2 == nullptr) + g_set_error(error_r, db_quark(), DB_NOT_FOUND, + "No such song: %s", uri); + + return song2; +} + +void +ProxyDatabase::ReturnSong(struct song *song) const +{ + assert(song != nullptr); + assert(song_in_database(song)); + assert(song_is_detached(song)); + + song_free(song); +} + +static bool +Visit(struct mpd_connection *connection, const char *uri, + bool recursive, VisitDirectory visit_directory, VisitSong visit_song, + VisitPlaylist visit_playlist, GError **error_r); + +static bool +Visit(struct mpd_connection *connection, + bool recursive, const struct mpd_directory *directory, + VisitDirectory visit_directory, VisitSong visit_song, + VisitPlaylist visit_playlist, GError **error_r) +{ + const char *path = mpd_directory_get_path(directory); + + if (visit_directory) { + struct directory *d = + directory_new(path, &detached_root); + bool success = visit_directory(*d, error_r); + directory_free(d); + if (!success) + return false; + } + + if (recursive && + !Visit(connection, path, recursive, + visit_directory, visit_song, visit_playlist, error_r)) + return false; + + return true; +} + +static void +Copy(struct tag *tag, enum tag_type d_tag, + const struct mpd_song *song, enum mpd_tag_type s_tag) +{ + + for (unsigned i = 0;; ++i) { + const char *value = mpd_song_get_tag(song, s_tag, i); + if (value == NULL) + break; + + tag_add_item(tag, d_tag, value); + } +} + +static song * +Convert(const struct mpd_song *song) +{ + struct song *s = song_detached_new(mpd_song_get_uri(song)); + + s->mtime = mpd_song_get_last_modified(song); + s->start_ms = mpd_song_get_start(song) * 1000; + s->end_ms = mpd_song_get_end(song) * 1000; + + struct tag *tag = tag_new(); + tag->time = mpd_song_get_duration(song); + + tag_begin_add(tag); + for (auto i = tag_table; i->d != TAG_NUM_OF_ITEM_TYPES; ++i) + Copy(tag, i->d, song, i->s); + tag_end_add(tag); + + s->tag = tag; + + return s; +} + +static bool +Visit(const struct mpd_song *song, + VisitSong visit_song, GError **error_r) +{ + if (!visit_song) + return true; + + struct song *s = Convert(song); + bool success = visit_song(*s, error_r); + song_free(s); + + return success; +} + +static bool +Visit(const struct mpd_playlist *playlist, + VisitPlaylist visit_playlist, GError **error_r) +{ + if (!visit_playlist) + return true; + + struct playlist_metadata p; + p.name = g_strdup(mpd_playlist_get_path(playlist)); + p.mtime = mpd_playlist_get_last_modified(playlist); + + bool success = visit_playlist(p, detached_root, error_r); + g_free(p.name); + + return success; +} + +class ProxyEntity { + struct mpd_entity *entity; + +public: + explicit ProxyEntity(struct mpd_entity *_entity) + :entity(_entity) {} + + ProxyEntity(const ProxyEntity &other) = delete; + + ProxyEntity(ProxyEntity &&other) + :entity(other.entity) { + other.entity = nullptr; + } + + ~ProxyEntity() { + if (entity != nullptr) + mpd_entity_free(entity); + } + + ProxyEntity &operator=(const ProxyEntity &other) = delete; + + operator const struct mpd_entity *() const { + return entity; + } +}; + +static std::list<ProxyEntity> +ReceiveEntities(struct mpd_connection *connection) +{ + std::list<ProxyEntity> entities; + struct mpd_entity *entity; + while ((entity = mpd_recv_entity(connection)) != NULL) + entities.push_back(ProxyEntity(entity)); + + mpd_response_finish(connection); + return entities; +} + +static bool +Visit(struct mpd_connection *connection, const char *uri, + bool recursive, VisitDirectory visit_directory, VisitSong visit_song, + VisitPlaylist visit_playlist, GError **error_r) +{ + if (!mpd_send_list_meta(connection, uri)) + return CheckError(connection, error_r); + + std::list<ProxyEntity> entities(ReceiveEntities(connection)); + if (!CheckError(connection, error_r)) + return false; + + for (const auto &entity : entities) { + switch (mpd_entity_get_type(entity)) { + case MPD_ENTITY_TYPE_UNKNOWN: + break; + + case MPD_ENTITY_TYPE_DIRECTORY: + if (!Visit(connection, recursive, + mpd_entity_get_directory(entity), + visit_directory, visit_song, visit_playlist, + error_r)) + return false; + break; + + case MPD_ENTITY_TYPE_SONG: + if (!Visit(mpd_entity_get_song(entity), visit_song, + error_r)) + return false; + break; + + case MPD_ENTITY_TYPE_PLAYLIST: + if (!Visit(mpd_entity_get_playlist(entity), + visit_playlist, error_r)) + return false; + break; + } + } + + return CheckError(connection, error_r); +} + +bool +ProxyDatabase::Visit(const DatabaseSelection &selection, + VisitDirectory visit_directory, + VisitSong visit_song, + VisitPlaylist visit_playlist, + GError **error_r) const +{ + // TODO: match + // TODO: auto-reconnect + + return ::Visit(connection, selection.uri, selection.recursive, + visit_directory, visit_song, visit_playlist, + error_r); +} + +bool +ProxyDatabase::VisitUniqueTags(const DatabaseSelection &selection, + enum tag_type tag_type, + VisitString visit_string, + GError **error_r) const +{ + enum mpd_tag_type tag_type2 = Convert(tag_type); + if (tag_type2 == MPD_TAG_COUNT) { + g_set_error_literal(error_r, libmpdclient_quark(), 0, + "Unsupported tag"); + return false; + } + + if (!mpd_search_db_tags(connection, tag_type2)) + return CheckError(connection, error_r); + + // TODO: match + (void)selection; + + if (!mpd_search_commit(connection)) + return CheckError(connection, error_r); + + bool result = true; + + struct mpd_pair *pair; + while (result && + (pair = mpd_recv_pair_tag(connection, tag_type2)) != nullptr) { + result = visit_string(pair->value, error_r); + mpd_return_pair(connection, pair); + } + + return mpd_response_finish(connection) && + CheckError(connection, error_r) && + result; +} + +bool +ProxyDatabase::GetStats(const DatabaseSelection &selection, + DatabaseStats &stats, GError **error_r) const +{ + // TODO: match + (void)selection; + + struct mpd_stats *stats2 = + mpd_run_stats(connection); + if (stats2 == nullptr) + return CheckError(connection, error_r); + + stats.song_count = mpd_stats_get_number_of_songs(stats2); + stats.total_duration = mpd_stats_get_db_play_time(stats2); + stats.artist_count = mpd_stats_get_number_of_artists(stats2); + stats.album_count = mpd_stats_get_number_of_albums(stats2); + mpd_stats_free(stats2); + + return true; +} + +const DatabasePlugin proxy_db_plugin = { + "proxy", + ProxyDatabase::Create, +}; |