aft: Add documentation of free_status_items().

[paraslash.git] / aft.c

diff --git a/aft.c b/aft.c
index 8969e7ac207ac935a83e4a212ee07d09e7317bc1..0544091bdba4e5054b120e24322504f56e38df4f 100644 (file)
--- a/aft.c
+++ b/aft.c
@@ -42,6 +42,7 @@ struct ls_data {
  */
 static struct osl_table *audio_file_table; /* NULL if table not open */
 static struct osl_row *current_aft_row; /* NULL if no audio file open */
+static unsigned char current_hash[HASH_SIZE]; /* only used on sighup */
 
 static char *status_items;
 static char *parser_friendly_status_items;
@@ -982,6 +983,17 @@ out:
        WRITE_STATUS_ITEM(pb, SI_file_size, "%ld\n", statbuf.st_size / 1024);
 }
 
+/**
+ * Deallocate and invalidate the status item strings.
+ *
+ * This needs to be a public function so that afs.c can call it on shutdown.
+ */
+void free_status_items(void)
+{
+       freep(&status_items);
+       freep(&parser_friendly_status_items);
+}
+
 static int make_status_items(void)
 {
        const struct lls_command *cmd = SERVER_CMD_CMD_PTR(LS);
@@ -991,6 +1003,7 @@ static int make_status_items(void)
        time_t current_time;
        int ret;
 
+       free_status_items();
        if (!status_item_ls_data.path) /* no audio file open */
                return 0;
        ret = lls_parse(ARRAY_SIZE(argv), argv, cmd, &opts.lpr, NULL);
@@ -1000,23 +1013,20 @@ static int make_status_items(void)
        if (ret < 0)
                goto out;
        make_inode_status_items(&pb);
-       free(status_items);
        status_items = pb.buf;
 
        memset(&pb, 0, sizeof(pb));
        pb.max_size = shm_get_shmmax() - 1;
        pb.flags = PBF_SIZE_PREFIX;
        ret = print_list_item(&status_item_ls_data, &opts, &pb, current_time);
-       if (ret < 0) {
-               free(status_items);
-               status_items = NULL;
-               return ret;
-       }
+       if (ret < 0)
+               goto out;
        make_inode_status_items(&pb);
-       free(parser_friendly_status_items);
        parser_friendly_status_items = pb.buf;
        ret = 1;
 out:
+       if (ret < 0)
+               free_status_items();
        lls_free_parse_result(opts.lpr, cmd);
        return ret;
 }
@@ -2475,28 +2485,30 @@ int aft_check_attributes(uint64_t att_mask, struct para_buffer *pb)
        return audio_file_loop(&acad, check_atts_of_audio_file);
 }
 
-/**
- * Close the audio file table.
- *
- * \param flags Usual flags that are passed to osl_close_table().
- *
- * \sa \ref osl_close_table().
+/*
+ * This sets audio_file_table to NULL, but leaves current_aft_row unmodified,
+ * though stale (pointing to unmapped memory). If the table is being closed
+ * because we received SIGHUP, the table will be reopened after the config file
+ * has been reloaded. We remember the hash of the current audio file here so
+ * that aft_open() can initialize current_aft_row by looking up the saved hash.
  */
 static void aft_close(void)
 {
+       int ret;
+       unsigned char *p;
+
+       if (current_aft_row) {
+               ret = get_hash_of_row(current_aft_row, &p);
+               if (ret < 0) {
+                       PARA_WARNING_LOG("hash lookup failure\n");
+                       current_aft_row = NULL;
+               } else
+                       memcpy(current_hash, p, HASH_SIZE);
+       }
        osl_close_table(audio_file_table, OSL_MARK_CLEAN);
        audio_file_table = NULL;
 }
 
-/**
- * Open the audio file table.
- *
- * \param dir The database directory.
- *
- * \return Standard.
- *
- * \sa \ref osl_open_table().
- */
 static int aft_open(const char *dir)
 {
        int ret;
@@ -2507,7 +2519,20 @@ static int aft_open(const char *dir)
                unsigned num;
                osl_get_num_rows(audio_file_table, &num);
                PARA_INFO_LOG("audio file table contains %u files\n", num);
-               return ret;
+               if (!current_aft_row) {
+                       PARA_DEBUG_LOG("no current aft row\n");
+                       return 1;
+               }
+               /* SIGHUP case, update current_aft_row */
+               ret = aft_get_row_of_hash(current_hash, &current_aft_row);
+               if (ret < 0) { /* not fatal */
+                       PARA_WARNING_LOG("current hash lookup failure: %s\n",
+                               para_strerror(-ret));
+                       current_aft_row = NULL;
+                       return 1;
+               }
+               PARA_NOTICE_LOG("current audio file hash lookup: success\n");
+               return 1;
        }
        PARA_NOTICE_LOG("failed to open audio file table\n");
        audio_file_table = NULL;
@@ -2563,6 +2588,16 @@ static int aft_event_handler(enum afs_events event, struct para_buffer *pb,
                status_item_ls_data.afsi.last_played = old_last_played;
                make_status_items();
                return 1;
+       } case AUDIO_FILE_RENAME: {
+               char *path;
+               if (data != current_aft_row)
+                       return 0;
+               ret = get_audio_file_path_of_row(current_aft_row, &path);
+               if (ret < 0)
+                       return ret;
+               status_item_ls_data.path = path;
+               make_status_items();
+               return 1;
        } case AFHI_CHANGE: {
                if (data != current_aft_row)
                        return 0;
@@ -2571,6 +2606,10 @@ static int aft_event_handler(enum afs_events event, struct para_buffer *pb,
                        return ret;
                make_status_items();
                return 1;
+       } case AUDIO_FILE_REMOVE: {
+               if (data == current_aft_row)
+                       current_aft_row = NULL;
+               return 0;
        }
        case BLOB_RENAME:
        case BLOB_REMOVE: