X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=lib%2Fmessage.cc;h=8d72ea22207b56b00cb600dfb3b68258374ba076;hp=38bc92914163bc92441ee05f8aede64a65d3efca;hb=07b6220a5595bf4556e636709220121d6405e9e9;hpb=f5db7ad7d243785c274a99734c681e69d13313d0

diff --git a/lib/message.cc b/lib/message.cc
index 38bc9291..8d72ea22 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -39,6 +39,12 @@ struct visible _notmuch_message {
     notmuch_message_file_t *message_file;
     notmuch_message_list_t *replies;
     unsigned long flags;
+    /* For flags that are initialized on-demand, lazy_flags indicates
+     * if each flag has been initialized. */
+    unsigned long lazy_flags;
+
+    /* Message document modified since last sync */
+    notmuch_bool_t modified;
 
     Xapian::Document doc;
     Xapian::termcount termpos;
@@ -99,6 +105,7 @@ _notmuch_message_create_for_document (const void *talloc_owner,
 
     message->frozen = 0;
     message->flags = 0;
+    message->lazy_flags = 0;
 
     /* Each of these will be lazily created as needed. */
     message->message_id = NULL;
@@ -192,7 +199,7 @@ _notmuch_message_create (const void *talloc_owner,
  *
  *     There is already a document with message ID 'message_id' in the
  *     database. The returned message can be used to query/modify the
- *     document.
+ *     document. The message may be a ghost message.
  *
  *   NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND:
  *
@@ -248,7 +255,7 @@ _notmuch_message_create_for_message_id (notmuch_database_t *notmuch,
 
 	doc_id = _notmuch_database_generate_doc_id (notmuch);
     } catch (const Xapian::Error &error) {
-	fprintf (stderr, "A Xapian exception occurred creating message: %s\n",
+	_notmuch_database_log(_notmuch_message_database (message), "A Xapian exception occurred creating message: %s\n",
 		 error.get_msg().c_str());
 	notmuch->exception_reported = TRUE;
 	*status_ret = NOTMUCH_PRIVATE_STATUS_XAPIAN_EXCEPTION;
@@ -279,7 +286,7 @@ _notmuch_message_get_term (notmuch_message_t *message,
     if (i == end)
 	return NULL;
 
-    std::string term = *i;
+    const std::string &term = *i;
     if (strncmp (term.c_str(), prefix, prefix_len))
 	return NULL;
 
@@ -305,6 +312,7 @@ _notmuch_message_ensure_metadata (notmuch_message_t *message)
     const char *thread_prefix = _find_prefix ("thread"),
 	*tag_prefix = _find_prefix ("tag"),
 	*id_prefix = _find_prefix ("id"),
+	*type_prefix = _find_prefix ("type"),
 	*filename_prefix = _find_prefix ("file-direntry"),
 	*replyto_prefix = _find_prefix ("replyto");
 
@@ -337,10 +345,25 @@ _notmuch_message_ensure_metadata (notmuch_message_t *message)
 	message->message_id =
 	    _notmuch_message_get_term (message, i, end, id_prefix);
 
+    /* Get document type */
+    assert (strcmp (id_prefix, type_prefix) < 0);
+    if (! NOTMUCH_TEST_BIT (message->lazy_flags, NOTMUCH_MESSAGE_FLAG_GHOST)) {
+	i.skip_to (type_prefix);
+	/* "T" is the prefix "type" fields.  See
+	 * BOOLEAN_PREFIX_INTERNAL. */
+	if (*i == "Tmail")
+	    NOTMUCH_CLEAR_BIT (&message->flags, NOTMUCH_MESSAGE_FLAG_GHOST);
+	else if (*i == "Tghost")
+	    NOTMUCH_SET_BIT (&message->flags, NOTMUCH_MESSAGE_FLAG_GHOST);
+	else
+	    INTERNAL_ERROR ("Message without type term");
+	NOTMUCH_SET_BIT (&message->lazy_flags, NOTMUCH_MESSAGE_FLAG_GHOST);
+    }
+
     /* Get filename list.  Here we get only the terms.  We lazily
      * expand them to full file names when needed in
      * _notmuch_message_ensure_filename_list. */
-    assert (strcmp (id_prefix, filename_prefix) < 0);
+    assert (strcmp (type_prefix, filename_prefix) < 0);
     if (!message->filename_term_list && !message->filename_list)
 	message->filename_term_list =
 	    _notmuch_database_get_terms_with_prefix (message, i, end,
@@ -371,6 +394,11 @@ _notmuch_message_invalidate_metadata (notmuch_message_t *message,
 	message->tag_list = NULL;
     }
 
+    if (strcmp ("type", prefix_name) == 0) {
+	NOTMUCH_CLEAR_BIT (&message->flags, NOTMUCH_MESSAGE_FLAG_GHOST);
+	NOTMUCH_CLEAR_BIT (&message->lazy_flags, NOTMUCH_MESSAGE_FLAG_GHOST);
+    }
+
     if (strcmp ("file-direntry", prefix_name) == 0) {
 	talloc_free (message->filename_term_list);
 	talloc_free (message->filename_list);
@@ -412,7 +440,8 @@ _notmuch_message_ensure_message_file (notmuch_message_t *message)
     if (unlikely (filename == NULL))
 	return;
 
-    message->message_file = _notmuch_message_file_open_ctx (message, filename);
+    message->message_file = _notmuch_message_file_open_ctx (
+	_notmuch_message_database (message), message, filename);
 }
 
 const char *
@@ -442,7 +471,7 @@ notmuch_message_get_header (notmuch_message_t *message, const char *header)
 		return talloc_strdup (message, value.c_str ());
 
 	} catch (Xapian::Error &error) {
-	    fprintf (stderr, "A Xapian exception occurred when reading header: %s\n",
+	    _notmuch_database_log(_notmuch_message_database (message), "A Xapian exception occurred when reading header: %s\n",
 		     error.get_msg().c_str());
 	    message->notmuch->exception_reported = TRUE;
 	    return NULL;
@@ -513,6 +542,7 @@ _notmuch_message_remove_terms (notmuch_message_t *message, const char *prefix)
 
 	try {
 	    message->doc.remove_term ((*i));
+	    message->modified = TRUE;
 	} catch (const Xapian::InvalidArgumentError) {
 	    /* Ignore failure to remove non-existent term. */
 	}
@@ -616,15 +646,16 @@ _notmuch_message_add_directory_terms (void *ctx, notmuch_message_t *message)
 	unsigned int directory_id;
 	const char *direntry, *directory;
 	char *colon;
+	const std::string &term = *i;
 
 	/* Terminate loop at first term without desired prefix. */
-	if (strncmp ((*i).c_str (), direntry_prefix, direntry_prefix_len))
+	if (strncmp (term.c_str (), direntry_prefix, direntry_prefix_len))
 	    break;
 
 	/* Indicate that there are filenames remaining. */
 	status = NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID;
 
-	direntry = (*i).c_str ();
+	direntry = term.c_str ();
 	direntry += direntry_prefix_len;
 
 	directory_id = strtol (direntry, &colon, 10);
@@ -697,7 +728,7 @@ _notmuch_message_add_filename (notmuch_message_t *message,
  * Note: This function does not remove a document from the database,
  * even if the specified filename is the only filename for this
  * message. For that functionality, see
- * _notmuch_database_remove_message. */
+ * notmuch_database_remove_message. */
 notmuch_status_t
 _notmuch_message_remove_filename (notmuch_message_t *message,
 				  const char *filename)
@@ -766,6 +797,7 @@ void
 _notmuch_message_clear_data (notmuch_message_t *message)
 {
     message->doc.set_data ("");
+    message->modified = TRUE;
 }
 
 static void
@@ -869,7 +901,11 @@ notmuch_bool_t
 notmuch_message_get_flag (notmuch_message_t *message,
 			  notmuch_message_flag_t flag)
 {
-    return message->flags & (1 << flag);
+    if (flag == NOTMUCH_MESSAGE_FLAG_GHOST &&
+	! NOTMUCH_TEST_BIT (message->lazy_flags, flag))
+	_notmuch_message_ensure_metadata (message);
+
+    return NOTMUCH_TEST_BIT (message->flags, flag);
 }
 
 void
@@ -877,9 +913,10 @@ notmuch_message_set_flag (notmuch_message_t *message,
 			  notmuch_message_flag_t flag, notmuch_bool_t enable)
 {
     if (enable)
-	message->flags |= (1 << flag);
+	NOTMUCH_SET_BIT (&message->flags, flag);
     else
-	message->flags &= ~(1 << flag);
+	NOTMUCH_CLEAR_BIT (&message->flags, flag);
+    NOTMUCH_SET_BIT (&message->lazy_flags, flag);
 }
 
 time_t
@@ -890,7 +927,7 @@ notmuch_message_get_date (notmuch_message_t *message)
     try {
 	value = message->doc.get_value (NOTMUCH_VALUE_TIMESTAMP);
     } catch (Xapian::Error &error) {
-	fprintf (stderr, "A Xapian exception occurred when reading date: %s\n",
+	_notmuch_database_log(_notmuch_message_database (message), "A Xapian exception occurred when reading date: %s\n",
 		 error.get_msg().c_str());
 	message->notmuch->exception_reported = TRUE;
 	return 0;
@@ -958,6 +995,17 @@ _notmuch_message_set_header_values (notmuch_message_t *message,
 			    Xapian::sortable_serialise (time_value));
     message->doc.add_value (NOTMUCH_VALUE_FROM, from);
     message->doc.add_value (NOTMUCH_VALUE_SUBJECT, subject);
+    message->modified = TRUE;
+}
+
+/* Upgrade a message to support NOTMUCH_FEATURE_LAST_MOD.  The caller
+ * must call _notmuch_message_sync. */
+void
+_notmuch_message_upgrade_last_mod (notmuch_message_t *message)
+{
+    /* _notmuch_message_sync will update the last modification
+     * revision; we just have to ask it to. */
+    message->modified = TRUE;
 }
 
 /* Synchronize changes made to message->doc out into the database. */
@@ -969,8 +1017,24 @@ _notmuch_message_sync (notmuch_message_t *message)
     if (message->notmuch->mode == NOTMUCH_DATABASE_MODE_READ_ONLY)
 	return;
 
+    if (! message->modified)
+	return;
+
+    /* Update the last modification of this message. */
+    if (message->notmuch->features & NOTMUCH_FEATURE_LAST_MOD)
+	/* sortable_serialise gives a reasonably compact encoding,
+	 * which directly translates to reduced IO when scanning the
+	 * value stream.  Since it's built for doubles, we only get 53
+	 * effective bits, but that's still enough for the database to
+	 * last a few centuries at 1 million revisions per second. */
+	message->doc.add_value (NOTMUCH_VALUE_LAST_MOD,
+				Xapian::sortable_serialise (
+				    _notmuch_database_new_revision (
+					message->notmuch)));
+
     db = static_cast <Xapian::WritableDatabase *> (message->notmuch->xapian_db);
     db->replace_document (message->doc_id, message->doc);
+    message->modified = FALSE;
 }
 
 /* Delete a message document from the database. */
@@ -989,6 +1053,24 @@ _notmuch_message_delete (notmuch_message_t *message)
     return NOTMUCH_STATUS_SUCCESS;
 }
 
+/* Transform a blank message into a ghost message.  The caller must
+ * _notmuch_message_sync the message. */
+notmuch_private_status_t
+_notmuch_message_initialize_ghost (notmuch_message_t *message,
+				   const char *thread_id)
+{
+    notmuch_private_status_t status;
+
+    status = _notmuch_message_add_term (message, "type", "ghost");
+    if (status)
+	return status;
+    status = _notmuch_message_add_term (message, "thread", thread_id);
+    if (status)
+	return status;
+
+    return NOTMUCH_PRIVATE_STATUS_SUCCESS;
+}
+
 /* Ensure that 'message' is not holding any file object open. Future
  * calls to various functions will still automatically open the
  * message file as needed.
@@ -1027,6 +1109,7 @@ _notmuch_message_add_term (notmuch_message_t *message,
 	return NOTMUCH_PRIVATE_STATUS_TERM_TOO_LONG;
 
     message->doc.add_term (term, 0);
+    message->modified = TRUE;
 
     talloc_free (term);
 
@@ -1095,8 +1178,9 @@ _notmuch_message_remove_term (notmuch_message_t *message,
 
     try {
 	message->doc.remove_term (term);
+	message->modified = TRUE;
     } catch (const Xapian::InvalidArgumentError) {
-	/* We'll let the philosopher's try to wrestle with the
+	/* We'll let the philosophers try to wrestle with the
 	 * question of whether failing to remove that which was not
 	 * there in the first place is failure. For us, we'll silently
 	 * consider it all good. */
@@ -1577,3 +1661,9 @@ notmuch_message_destroy (notmuch_message_t *message)
 {
     talloc_free (message);
 }
+
+notmuch_database_t *
+_notmuch_message_database (notmuch_message_t *message)
+{
+    return message->notmuch;
+}