X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=afs.c;h=445d5871097b79cdcd14170c2a1f59998354dc98;hp=06b4132acde340d16500a321e756dac57221fc6c;hb=HEAD;hpb=462a71176aa847494a1a26826768b5fa52994f54

diff --git a/afs.c b/afs.c
index 06b4132a..445d5871 100644
--- a/afs.c
+++ b/afs.c
@@ -100,7 +100,7 @@ extern uint32_t afs_socket_cookie;
  */
 struct callback_query {
 	/** The function to be called. */
-	afs_callback *handler;
+	afs_callback *cb;
 	/** The number of bytes of the query */
 	size_t query_size;
 };
@@ -191,7 +191,7 @@ int send_callback_request(afs_callback *f, struct osl_object *query,
 	if (ret < 0)
 		goto out;
 	cq = query_shm;
-	cq->handler = f;
+	cq->cb = f;
 	cq->query_size = query_shm_size - sizeof(*cq);
 
 	if (query)
@@ -437,18 +437,18 @@ static int activate_mood_or_playlist(const char *arg, struct para_buffer *pb)
 	int ret;
 	char *msg;
 
-	if (!arg) {
-		ret = mood_switch(NULL, &msg);
+	if (!arg) { /* load dummy mood */
+		ret = mood_load(NULL, NULL, &msg);
 		mode = PLAY_MODE_MOOD;
 	} else if (!strncmp(arg, "p/", 2)) {
-		ret = playlist_open(arg + 2, &msg);
+		ret = playlist_load(arg + 2, NULL, &msg);
 		mode = PLAY_MODE_PLAYLIST;
 	} else if (!strncmp(arg, "m/", 2)) {
-		ret = mood_switch(arg + 2, &msg);
+		ret = mood_load(arg + 2, NULL, &msg);
 		mode = PLAY_MODE_MOOD;
 	} else {
 		ret = -ERRNO_TO_PARA_ERROR(EINVAL);
-		msg = make_message("%s: parse error", arg);
+		msg = make_message("%s: parse error\n", arg);
 	}
 	if (pb)
 		para_printf(pb, "%s", msg);
@@ -525,63 +525,12 @@ static void flush_and_free_pb(struct para_buffer *pb)
 	free(pb->buf);
 }
 
-static int com_select_callback(struct afs_callback_arg *aca)
-{
-	const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
-	const char *arg;
-	int ret;
-
-	ret = lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr);
-	assert(ret >= 0);
-	arg = lls_input(0, aca->lpr);
-	ret = clear_score_table();
-	if (ret < 0) {
-		para_printf(&aca->pbout, "could not clear score table\n");
-		goto free_lpr;
-	}
-	if (current_play_mode == PLAY_MODE_MOOD)
-		close_current_mood();
-	else
-		playlist_close();
-	ret = activate_mood_or_playlist(arg, &aca->pbout);
-	if (ret >= 0)
-		goto free_lpr;
-	/* ignore subsequent errors (but log them) */
-	if (current_mop && strcmp(current_mop, arg) != 0) {
-		int ret2;
-		para_printf(&aca->pbout, "switching back to %s\n", current_mop);
-		ret2 = activate_mood_or_playlist(current_mop, &aca->pbout);
-		if (ret2 >= 0)
-			goto free_lpr;
-		para_printf(&aca->pbout, "could not reactivate %s: %s\n",
-			current_mop, para_strerror(-ret2));
-	}
-	activate_mood_or_playlist(NULL, &aca->pbout);
-free_lpr:
-	lls_free_parse_result(aca->lpr, cmd);
-	return ret;
-}
-
-static int com_select(struct command_context *cc, struct lls_parse_result *lpr)
-{
-	const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
-	char *errctx;
-	int ret = lls(lls_check_arg_count(lpr, 1, 1, &errctx));
-
-	if (ret < 0) {
-		send_errctx(cc, errctx);
-		return ret;
-	}
-	return send_lls_callback_request(com_select_callback, cmd, lpr, cc);
-}
-EXPORT_SERVER_CMD_HANDLER(select);
-
 static void init_admissible_files(const char *arg)
 {
 	int ret = activate_mood_or_playlist(arg, NULL);
 	if (ret < 0) {
-		PARA_WARNING_LOG("could not activate %s: %s\n", arg,
-			para_strerror(-ret));
+		PARA_WARNING_LOG("could not activate %s: %s\n", arg?
+			arg : "dummy", para_strerror(-ret));
 		if (arg)
 			activate_mood_or_playlist(NULL, NULL);
 	}
@@ -631,17 +580,6 @@ static void get_database_dir(void)
 	PARA_INFO_LOG("afs_database dir %s\n", database_dir);
 }
 
-static int make_database_dir(void)
-{
-	int ret;
-
-	get_database_dir();
-	ret = para_mkdir(database_dir, 0777);
-	if (ret >= 0 || ret == -ERRNO_TO_PARA_ERROR(EEXIST))
-		return 1;
-	return ret;
-}
-
 static int open_afs_tables(void)
 {
 	int i, ret;
@@ -779,6 +717,43 @@ err:
 	return ret;
 }
 
+/**
+ * Format and send an error message to the command handler.
+ *
+ * To pass an error message from the callback of an afs command to the client,
+ * this function should be called. It formats the message into a buffer which
+ * is passed as a shared memory area to the command handler from where it
+ * propagates to the client.
+ *
+ * The message will be tagged with the ERROR_LOG sideband designator so that
+ * the client writes it to its stderr stream rather than to stdout as with
+ * aca->pbout. In analogy to the default Unix semantics of stderr, the message
+ * is sent without buffering.
+ *
+ * If sending the error message fails, an error is logged on the server side,
+ * but no other action is taken.
+ *
+ * \param aca Used to obtain the fd to send the shmid to.
+ * \param fmt Usual format string.
+ */
+__printf_2_3 void afs_error(const struct afs_callback_arg *aca,
+		const char *fmt,...)
+{
+	va_list argp;
+	char *msg;
+	unsigned n;
+	int ret;
+
+	va_start(argp, fmt);
+	n = xvasprintf(&msg, fmt, argp);
+	va_end(argp);
+	ret = pass_buffer_as_shm(aca->fd, SBD_ERROR_LOG, msg, n + 1);
+	if (ret < 0)
+		PARA_ERROR_LOG("Could not send %s: %s\n", msg,
+			para_strerror(-ret));
+	free(msg);
+}
+
 static int call_callback(int fd, int query_shmid)
 {
 	void *query_shm;
@@ -798,7 +773,7 @@ static int call_callback(int fd, int query_shmid)
 		.fd = fd,
 		.band = SBD_OUTPUT
 	};
-	ret = cq->handler(&aca);
+	ret = cq->cb(&aca);
 	ret2 = shm_detach(query_shm);
 	if (ret2 < 0) {
 		if (ret < 0) /* ignore (but log) detach error */
@@ -976,7 +951,8 @@ __noreturn void afs_init(int socket_fd)
 	}
 	ret = schedule(&s);
 	sched_shutdown(&s);
-	close_current_mood();
+	mood_unload(NULL);
+	playlist_unload(NULL);
 out_close:
 	close_afs_tables();
 out:
@@ -989,6 +965,57 @@ out:
 	exit(EXIT_FAILURE);
 }
 
+static int com_select_callback(struct afs_callback_arg *aca)
+{
+	const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
+	const char *arg;
+	int ret;
+	struct para_buffer *pbout;
+
+	ret = lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr);
+	assert(ret >= 0);
+	arg = lls_input(0, aca->lpr);
+	pbout = SERVER_CMD_OPT_GIVEN(SELECT, VERBOSE, aca->lpr)?
+		&aca->pbout : NULL;
+	score_clear();
+	if (current_play_mode == PLAY_MODE_MOOD)
+		mood_unload(NULL);
+	else
+		playlist_unload(NULL);
+	ret = activate_mood_or_playlist(arg, pbout);
+	if (ret >= 0)
+		goto free_lpr;
+	/* ignore subsequent errors (but log them) */
+	if (current_mop && strcmp(current_mop, arg) != 0) {
+		int ret2;
+		afs_error(aca, "switching back to %s\n", current_mop);
+		ret2 = activate_mood_or_playlist(current_mop, pbout);
+		if (ret2 >= 0)
+			goto free_lpr;
+		afs_error(aca, "could not reactivate %s: %s\n", current_mop,
+			para_strerror(-ret2));
+	}
+	activate_mood_or_playlist(NULL, pbout);
+free_lpr:
+	lls_free_parse_result(aca->lpr, cmd);
+	return ret;
+}
+
+static int com_select(struct command_context *cc, struct lls_parse_result *lpr)
+{
+	const struct lls_command *cmd = SERVER_CMD_CMD_PTR(SELECT);
+	char *errctx;
+	int ret = lls(lls_check_arg_count(lpr, 1, 1, &errctx));
+
+	if (ret < 0) {
+		send_errctx(cc, errctx);
+		return ret;
+	}
+	ret = send_lls_callback_request(com_select_callback, cmd, lpr, cc);
+	return ret == osl(-E_OSL_RB_KEY_NOT_FOUND)? -E_BAD_MOP : ret;
+}
+EXPORT_SERVER_CMD_HANDLER(select);
+
 static int com_init_callback(struct afs_callback_arg *aca)
 {
 	uint32_t table_mask = *(uint32_t *)aca->query.data;
@@ -1005,8 +1032,7 @@ static int com_init_callback(struct afs_callback_arg *aca)
 			continue;
 		ret = t->ops->create(database_dir);
 		if (ret < 0) {
-			para_printf(&aca->pbout, "cannot create table %s\n",
-				t->name);
+			afs_error(aca, "cannot create table %s\n", t->name);
 			goto out;
 		}
 		para_printf(&aca->pbout, "successfully created %s table\n",
@@ -1014,7 +1040,7 @@ static int com_init_callback(struct afs_callback_arg *aca)
 	}
 	ret = open_afs_tables();
 	if (ret < 0)
-		para_printf(&aca->pbout, "cannot open afs tables: %s\n",
+		afs_error(aca, "cannot open afs tables: %s\n",
 			para_strerror(-ret));
 out:
 	return ret;
@@ -1028,7 +1054,8 @@ static int com_init(struct command_context *cc, struct lls_parse_result *lpr)
 		.size = sizeof(table_mask)};
 	unsigned num_inputs = lls_num_inputs(lpr);
 
-	ret = make_database_dir();
+	get_database_dir();
+	ret = para_mkdir(database_dir);
 	if (ret < 0)
 		return ret;
 	if (num_inputs > 0) {