* TODO: Licensing
*/
+#include <stdio.h>
#include <stdint.h>
#include <glib.h>
#include <string.h>
return id;
}
+gchar *bluesky_cloudlog_id_to_string(BlueSkyCloudID id)
+{
+ char buf[sizeof(BlueSkyCloudID) * 2 + 1];
+ buf[0] = '\0';
+
+ for (int i = 0; i < sizeof(BlueSkyCloudID); i++) {
+ sprintf(&buf[2*i], "%02x", (uint8_t)(id.bytes[i]));
+ }
+
+ return g_strdup(buf);
+}
+
+BlueSkyCloudID bluesky_cloudlog_id_from_string(const gchar *idstr)
+{
+ BlueSkyCloudID id;
+ memset(&id, 0, sizeof(id));
+ for (int i = 0; i < 2*sizeof(BlueSkyCloudID); i++) {
+ char c = idstr[i];
+ if (c == '\0') {
+ g_warning("Short cloud id: %s\n", idstr);
+ break;
+ }
+ int val = 0;
+ if (c >= '0' && c <= '9')
+ val = c - '0';
+ else if (c >= 'a' && c <= 'f')
+ val = c - 'a' + 10;
+ else
+ g_warning("Bad character in cloud id: %s\n", idstr);
+ id.bytes[i / 2] += val << (i % 2 ? 0 : 4);
+ }
+ return id;
+}
+
gboolean bluesky_cloudlog_equal(gconstpointer a, gconstpointer b)
{
BlueSkyCloudID *id1 = (BlueSkyCloudID *)a, *id2 = (BlueSkyCloudID *)b;
{
BlueSkyCloudLog *log = g_new0(BlueSkyCloudLog, 1);
+ log->lock = g_mutex_new();
+ log->cond = g_cond_new();
log->fs = fs;
log->type = LOGTYPE_UNKNOWN;
log->id = bluesky_cloudlog_new_id();
+ log->pointers = g_array_new(FALSE, TRUE, sizeof(BlueSkyCloudID));
g_atomic_int_set(&log->refcount, 1);
return log;
void bluesky_cloudlog_ref(BlueSkyCloudLog *log)
{
+ if (log == NULL)
+ return;
+
g_atomic_int_inc(&log->refcount);
}
void bluesky_cloudlog_unref(BlueSkyCloudLog *log)
{
+ if (log == NULL)
+ return;
+
if (g_atomic_int_dec_and_test(&log->refcount)) {
g_print("Cloud log refcount dropped to zero.\n");
}
}
/* Start a write of the object to the local log. */
-BlueSkyLogItem *bluesky_cloudlog_sync(BlueSkyCloudLog *log)
+void bluesky_cloudlog_sync(BlueSkyCloudLog *log)
{
- BlueSkyLogItem *log_item = bluesky_log_item_new();
- log_item->key = g_strdup("cloudlog");
- log_item->data = log->data;
- bluesky_string_ref(log->data);
- bluesky_log_item_submit(log_item, log->fs->log);
- return log_item;
+ bluesky_log_item_submit(log, log->fs->log);
}
/* Add the given entry to the global hash table containing cloud log entries.
g_hash_table_insert(log->fs->locations, &log->id, log);
g_mutex_unlock(log->fs->lock);
}
+
+struct log_header {
+ char magic[4];
+ uint32_t size;
+ BlueSkyCloudID id;
+ uint32_t pointer_count;
+} __attribute__((packed));
+
+struct logref {
+ BlueSkyCloudID id;
+ BlueSkyCloudPointer location;
+} __attribute__((packed));
+
+struct log_footer {
+ char refmagic[4];
+ struct logref refs[0];
+};
+
+BlueSkyCloudPointer bluesky_cloudlog_serialize(BlueSkyCloudLog *log,
+ BlueSkyCloudLogState *state)
+{
+ if (log->location_flags & CLOUDLOG_CLOUD) {
+ return log->location;
+ }
+
+ g_print("Flushing object %s to cloud...\n",
+ bluesky_cloudlog_id_to_string(log->id));
+
+ for (int i = 0; i < log->pointers->len; i++) {
+ BlueSkyCloudID id = g_array_index(log->pointers, BlueSkyCloudID, i);
+ g_print(" ...checking reference %s...\n",
+ bluesky_cloudlog_id_to_string(id));
+ g_mutex_lock(log->fs->lock);
+ BlueSkyCloudLog *log2
+ = (BlueSkyCloudLog *)g_hash_table_lookup(log->fs->locations, &id);
+ // TODO: refcount
+ g_mutex_unlock(log->fs->lock);
+ g_assert(log2 != NULL);
+ bluesky_cloudlog_serialize(log2, state);
+ }
+
+ g_assert(log->data != NULL);
+
+ log->location = state->location;
+ log->location.offset = state->data->len;
+ log->location.size
+ = sizeof(struct log_header) + sizeof(BlueSkyCloudID) * 0
+ + log->data->len;
+
+ struct log_header header;
+ memcpy(header.magic, "AgI ", 4);
+ header.size = GUINT32_TO_LE(log->location.size);
+ header.id = log->id;
+ header.pointer_count = GUINT32_TO_LE(0);
+
+ g_string_append_len(state->data, (const char *)&header, sizeof(header));
+ g_string_append_len(state->data, log->data->data, log->data->len);
+
+ log->location_flags |= CLOUDLOG_CLOUD;
+
+ return log->location;
+}
+
+static void find_inodes(gpointer key, gpointer value, gpointer user_data)
+{
+ BlueSkyCloudLogState *state = (BlueSkyCloudLogState *)user_data;
+ BlueSkyCloudLog *item = (BlueSkyCloudLog *)value;
+
+ if (item->type != LOGTYPE_INODE)
+ return;
+
+ bluesky_cloudlog_ref(item);
+ state->inode_list = g_list_prepend(state->inode_list, item);
+}
+
+void bluesky_cloudlog_write_log(BlueSkyFS *fs)
+{
+ BlueSkyCloudLogState *state = fs->log_state;
+ if (state->data == NULL)
+ state->data = g_string_new("");
+
+ g_mutex_lock(fs->lock);
+ g_hash_table_foreach(fs->locations, find_inodes, state);
+ g_mutex_unlock(fs->lock);
+
+ while (state->inode_list != NULL) {
+ BlueSkyCloudLog *log = (BlueSkyCloudLog *)state->inode_list->data;
+ bluesky_cloudlog_serialize(log, state);
+ state->inode_list = g_list_delete_link(state->inode_list,
+ state->inode_list);
+ }
+
+ if (state->data->len > 0) {
+ g_print("Serialized %zd bytes of data to cloud\n", state->data->len);
+
+ BlueSkyStoreAsync *async = bluesky_store_async_new(fs->store);
+ async->op = STORE_OP_PUT;
+ async->key = g_strdup_printf("log-%08d-%08d",
+ state->location.directory,
+ state->location.sequence);
+ async->data = bluesky_string_new_from_gstring(state->data);
+ bluesky_store_async_submit(async);
+ bluesky_store_async_wait(async);
+ bluesky_store_async_unref(async);
+
+ state->location.sequence++;
+ state->location.offset = 0;
+ }
+
+ state->data = NULL;
+}
+
+/* Ensure that a cloud log item is loaded in memory, and if not read it in.
+ * TODO: Make asynchronous, and make this also fetch from the cloud. Right now
+ * we only read from the log. Log item must be locked. */
+void bluesky_cloudlog_fetch(BlueSkyCloudLog *log)
+{
+ if (log->data != NULL)
+ return;
+
+ g_print("Re-mapping log entry %d/%d/%d...\n",
+ log->log_seq, log->log_offset, log->log_size);
+
+ g_assert(log->location_flags & CLOUDLOG_JOURNAL);
+
+ log->data = bluesky_log_map_object(log->fs->log, log->log_seq,
+ log->log_offset, log->log_size);
+
+ g_cond_broadcast(log->cond);
+}
projects / bluesky.git / blobdiff