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lib: Internal support for querying and creating ghost messages

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This updates the message abstraction to support ghost messages: it
adds a message flag that distinguishes regular messages from ghost
messages, and an internal function for initializing a newly created
(blank) message as a ghost message.
This commit is contained in:
Austin Clements 2014-10-23 08:30:36 -04:00 committed by David Bremner
parent d99491f274
commit bc9c50602d
3 changed files with 62 additions and 3 deletions
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52
lib/message.cc
View file

@ -39,6 +39,9 @@ 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;
Xapian::Document doc;
Xapian::termcount termpos;
@ -99,6 +102,7 @@ _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 +196,7 @@ _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:
*
@ -305,6 +309,7 @@ _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 +342,25 @@ _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 +391,11 @@ _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);
@ -869,6 +894,10 @@ notmuch_bool_t
notmuch_message_get_flag (notmuch_message_t *message,
notmuch_message_flag_t 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);
}
@ -880,6 +909,7 @@ notmuch_message_set_flag (notmuch_message_t *message,
NOTMUCH_SET_BIT (&message->flags, flag);
else
NOTMUCH_CLEAR_BIT (&message->flags, flag);
NOTMUCH_SET_BIT (&message->lazy_flags, flag);
}
time_t
@ -989,6 +1019,24 @@ _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.

4
lib/notmuch-private.h
View file

@ -308,6 +308,10 @@ _notmuch_message_sync (notmuch_message_t *message);
notmuch_status_t
_notmuch_message_delete (notmuch_message_t *message);
notmuch_private_status_t
_notmuch_message_initialize_ghost (notmuch_message_t *message,
const char *thread_id);
void
_notmuch_message_close (notmuch_message_t *message);

9
lib/notmuch.h
View file

@ -1221,7 +1221,14 @@ notmuch_message_get_filenames (notmuch_message_t *message);
*/
typedef enum _notmuch_message_flag {
NOTMUCH_MESSAGE_FLAG_MATCH,
NOTMUCH_MESSAGE_FLAG_EXCLUDED
NOTMUCH_MESSAGE_FLAG_EXCLUDED,
/* This message is a "ghost message", meaning it has no filenames
* or content, but we know it exists because it was referenced by
* some other message. A ghost message has only a message ID and
* thread ID.
*/
NOTMUCH_MESSAGE_FLAG_GHOST,
} notmuch_message_flag_t;
/**