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lib: Rename set/get_timestamp to set/get_directory_mtime.

Browse source 
I've been suitably scolded by Keith for doing a premature
generalization that ended up just making the documentation more
convoluted. Fix that.
This commit is contained in:
Carl Worth 2009-12-17 14:33:34 -08:00
parent ba12bf1f26
commit 50ae83a17f
3 changed files with 66 additions and 71 deletions
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80
lib/database.cc
View file

@ -37,7 +37,7 @@ typedef struct {
/* Here's the current schema for our database:
*
* We currently have two different types of documents: mail and timestamps.
* We currently have two different types of documents: mail and directory.
*
* Mail document
* -------------
@ -75,21 +75,19 @@ typedef struct {
* user in searching. But the database doesn't really care itself
* about any of these.
*
* Timestamp document
* Directory document
* ------------------
* A timestamp document is used by a client of the notmuch library to
* A directory document is used by a client of the notmuch library to
* maintain data necessary to allow for efficient polling of mail
* directories. The notmuch library does no interpretation of
* timestamps, but merely allows the user to store and retrieve
* timestamps as name/value pairs.
* directories.
*
* The timestamp document is indexed with a single prefixed term:
* The directory document is indexed with a single prefixed term:
*
* timestamp: The user's key value (likely a directory name)
* directory: The directory path (an absolute path)
*
* and has a single value:
*
* TIMESTAMP: The time_t value from the user.
* TIMESTAMP: The mtime of the directory (at last scan)
*/
/* With these prefix values we follow the conventions published here:
@ -111,7 +109,8 @@ prefix_t BOOLEAN_PREFIX_INTERNAL[] = {
{ "type", "T" },
{ "reference", "XREFERENCE" },
{ "replyto", "XREPLYTO" },
{ "timestamp", "XTIMESTAMP" },
/* XXX: Need a flag day to rename XTIMESTAMP. */
{ "directory", "XTIMESTAMP" },
};
prefix_t BOOLEAN_PREFIX_EXTERNAL[] = {
@ -561,30 +560,29 @@ notmuch_database_get_path (notmuch_database_t *notmuch)
}
static notmuch_private_status_t
find_timestamp_document (notmuch_database_t *notmuch, const char *db_key,
find_directory_document (notmuch_database_t *notmuch, const char *db_path,
Xapian::Document *doc, unsigned int *doc_id)
{
return find_unique_document (notmuch, "timestamp", db_key, doc, doc_id);
return find_unique_document (notmuch, "directory", db_path, doc, doc_id);
}
/* We allow the user to use arbitrarily long keys for timestamps,
* (they're for filesystem paths after all, which have no limit we
* know about). But we have a term-length limit. So if we exceed that,
* we'll use the SHA-1 of the user's key as the actual key for
* constructing a database term.
/* We allow the user to use arbitrarily long paths for directories. But
* we have a term-length limit. So if we exceed that, we'll use the
* SHA-1 of the path for the database term.
*
* Caution: This function returns a newly allocated string which the
* caller should free() when finished.
* Note: This function may return the original value of 'path'. If it
* does not, then the caller is responsible to free() the returned
* value.
*/
static char *
timestamp_db_key (const char *key)
static const char *
directory_db_path (const char *path)
{
int term_len = strlen (_find_prefix ("timestamp")) + strlen (key);
int term_len = strlen (_find_prefix ("directory")) + strlen (path);
if (term_len > NOTMUCH_TERM_MAX)
return notmuch_sha1_of_string (key);
return notmuch_sha1_of_string (path);
else
return strdup (key);
return path;
}
/* Given a legal 'path' for the database, return the relative path.
@ -622,15 +620,16 @@ _notmuch_database_relative_path (notmuch_database_t *notmuch,
}
notmuch_status_t
notmuch_database_set_timestamp (notmuch_database_t *notmuch,
const char *key, time_t timestamp)
notmuch_database_set_directory_mtime (notmuch_database_t *notmuch,
const char *path,
time_t mtime)
{
Xapian::Document doc;
Xapian::WritableDatabase *db;
unsigned int doc_id;
notmuch_private_status_t status;
notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
char *db_key = NULL;
const char *db_path = NULL;
if (notmuch->mode == NOTMUCH_DATABASE_MODE_READ_ONLY) {
fprintf (stderr, "Attempted to update a read-only database.\n");
@ -638,17 +637,17 @@ notmuch_database_set_timestamp (notmuch_database_t *notmuch,
}
db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
db_key = timestamp_db_key (key);
db_path = directory_db_path (path);
try {
status = find_timestamp_document (notmuch, db_key, &doc, &doc_id);
status = find_directory_document (notmuch, db_path, &doc, &doc_id);
doc.add_value (NOTMUCH_VALUE_TIMESTAMP,
Xapian::sortable_serialise (timestamp));
Xapian::sortable_serialise (mtime));
if (status == NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND) {
char *term = talloc_asprintf (NULL, "%s%s",
_find_prefix ("timestamp"), db_key);
_find_prefix ("directory"), db_path);
doc.add_term (term);
talloc_free (term);
@ -658,31 +657,32 @@ notmuch_database_set_timestamp (notmuch_database_t *notmuch,
}
} catch (const Xapian::Error &error) {
fprintf (stderr, "A Xapian exception occurred setting timestamp: %s.\n",
fprintf (stderr, "A Xapian exception occurred setting directory mtime: %s.\n",
error.get_msg().c_str());
notmuch->exception_reported = TRUE;
ret = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
}
if (db_key)
free (db_key);
if (db_path != path)
free ((char *) db_path);
return ret;
}
time_t
notmuch_database_get_timestamp (notmuch_database_t *notmuch, const char *key)
notmuch_database_get_directory_mtime (notmuch_database_t *notmuch,
const char *path)
{
Xapian::Document doc;
unsigned int doc_id;
notmuch_private_status_t status;
char *db_key = NULL;
const char *db_path = NULL;
time_t ret = 0;
db_key = timestamp_db_key (key);
db_path = directory_db_path (path);
try {
status = find_timestamp_document (notmuch, db_key, &doc, &doc_id);
status = find_directory_document (notmuch, db_path, &doc, &doc_id);
if (status == NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND)
goto DONE;
@ -694,8 +694,8 @@ notmuch_database_get_timestamp (notmuch_database_t *notmuch, const char *key)
}
DONE:
if (db_key)
free (db_key);
if (db_path != path)
free ((char *) db_path);
return ret;
}

53
lib/notmuch.h
View file

@ -178,56 +178,51 @@ notmuch_database_close (notmuch_database_t *database);
const char *
notmuch_database_get_path (notmuch_database_t *database);
/* Store a timestamp within the database.
/* Store an mtime within the database for 'path'.
*
* The Notmuch database will not interpret this key nor the timestamp
* values at all. It will merely store them together and return the
* timestamp when notmuch_database_get_timestamp is called with the
* same value for 'key'.
*
* The intention is for the caller to use the timestamp to allow
* efficient identification of new messages to be added to the
* database. The recommended usage is as follows:
* The intention is for the caller to use the mtime to allow efficient
* identification of new messages to be added to the database. The
* recommended usage is as follows:
*
* o Read the mtime of a directory from the filesystem
*
* o Call add_message for all mail files in the directory
*
* o Call notmuch_database_set_timestamp with the path of the
* directory as 'key' and the originally read mtime as 'value'.
* o Call notmuch_database_set_directory_mtime
*
* Then, when wanting to check for updates to the directory in the
* future, the client can call notmuch_database_get_timestamp and know
* that it only needs to add files if the mtime of the directory and
* files are newer than the stored timestamp.
* future, the client can call notmuch_database_get_directory_mtime
* and know that it only needs to add files if the mtime of the
* directory and files are newer than the stored timestamp.
*
* Note: The notmuch_database_get_timestamp function does not allow
* the caller to distinguish a timestamp of 0 from a non-existent
* timestamp. So don't store a timestamp of 0 unless you are
* comfortable with that.
* Note: The notmuch_database_get_directory_mtime function does not
* allow the caller to distinguish a timestamp of 0 from a
* non-existent timestamp. So don't store a timestamp of 0 unless you
* are comfortable with that.
*
* Return value:
*
* NOTMUCH_STATUS_SUCCESS: Timestamp successfully stored in database.
* NOTMUCH_STATUS_SUCCESS: mtime successfully stored in database.
*
* NOTMUCH_STATUS_XAPIAN_EXCEPTION: A Xapian exception
* occurred. Timestamp not stored.
* occurred, mtime not stored.
*/
notmuch_status_t
notmuch_database_set_timestamp (notmuch_database_t *database,
const char *key, time_t timestamp);
notmuch_database_set_directory_mtime (notmuch_database_t *database,
const char *path,
time_t mtime);
/* Retrieve a timestamp from the database.
/* Retrieve the mtime from the database for 'path'.
*
* Returns the timestamp value previously stored by calling
* notmuch_database_set_timestamp with the same value for 'key'.
* Returns the mtime value previously stored by calling
* notmuch_database_set_directory_mtime with the same 'path'.
*
* Returns 0 if no timestamp is stored for 'key' or if any error
* occurred querying the database.
* Returns 0 if no mtime is stored for 'path' or if any error occurred
* querying the database.
*/
time_t
notmuch_database_get_timestamp (notmuch_database_t *database,
const char *key);
notmuch_database_get_directory_mtime (notmuch_database_t *database,
const char *path);
/* Add a new message to the given notmuch database.
*

4
notmuch-new.c
View file

@ -146,7 +146,7 @@ add_files_recursive (notmuch_database_t *notmuch,
path_mtime = st->st_mtime;
path_dbtime = notmuch_database_get_timestamp (notmuch, path);
path_dbtime = notmuch_database_get_directory_mtime (notmuch, path);
num_entries = scandir (path, &namelist, 0, ino_cmp);
if (num_entries == -1) {
@ -277,7 +277,7 @@ add_files_recursive (notmuch_database_t *notmuch,
next = NULL;
}
status = notmuch_database_set_timestamp (notmuch, path, path_mtime);
status = notmuch_database_set_directory_mtime (notmuch, path, path_mtime);
if (status && ret == NOTMUCH_STATUS_SUCCESS)
ret = status;