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lib: refactor notmuch_database_add_message header parsing

Browse source 
This function is large and hard to understand and modify. Start to
break it down into meaningful pieces.
This commit is contained in:
David Bremner 2017-06-04 09:32:27 -03:00
parent 2f94b3090c
commit 4fdabd636e
3 changed files with 101 additions and 50 deletions
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54
lib/add-message.cc
View file

@ -468,7 +468,7 @@ notmuch_database_add_message (notmuch_database_t *notmuch,
notmuch_private_status_t private_status;
notmuch_bool_t is_ghost = FALSE, is_new = FALSE;
const char *date, *header;
const char *date;
const char *from, *to, *subject;
char *message_id = NULL;
@ -489,57 +489,12 @@ notmuch_database_add_message (notmuch_database_t *notmuch,
if (ret)
goto DONE;
/* Parse message up front to get better error status. */
ret = _notmuch_message_file_parse (message_file);
ret = _notmuch_message_file_get_headers (message_file,
&from, &subject, &to, &date,
&message_id);
if (ret)
goto DONE;
/* Before we do any real work, (especially before doing a
* potential SHA-1 computation on the entire file's contents),
* let's make sure that what we're looking at looks like an
* actual email message.
*/
from = _notmuch_message_file_get_header (message_file, "from");
subject = _notmuch_message_file_get_header (message_file, "subject");
to = _notmuch_message_file_get_header (message_file, "to");
if ((from == NULL || *from == '\0') &&
(subject == NULL || *subject == '\0') &&
(to == NULL || *to == '\0')) {
ret = NOTMUCH_STATUS_FILE_NOT_EMAIL;
goto DONE;
}
/* Now that we're sure it's mail, the first order of business
* is to find a message ID (or else create one ourselves).
*/
header = _notmuch_message_file_get_header (message_file, "message-id");
if (header && *header != '\0') {
message_id = _parse_message_id (message_file, header, NULL);
/* So the header value isn't RFC-compliant, but it's
* better than no message-id at all.
*/
if (message_id == NULL)
message_id = talloc_strdup (message_file, header);
}
if (message_id == NULL ) {
/* No message-id at all, let's generate one by taking a
* hash over the file's contents.
*/
char *sha1 = _notmuch_sha1_of_file (filename);
/* If that failed too, something is really wrong. Give up. */
if (sha1 == NULL) {
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
message_id = talloc_asprintf (message_file, "notmuch-sha1-%s", sha1);
free (sha1);
}
try {
/* Now that we have a message ID, we get a message object,
* (which may or may not reference an existing document in the
@ -579,7 +534,6 @@ notmuch_database_add_message (notmuch_database_t *notmuch,
if (ret)
goto DONE;
date = _notmuch_message_file_get_header (message_file, "date");
_notmuch_message_set_header_values (message, date, from, subject);
ret = _notmuch_message_index_file (message, message_file);

86
lib/message-file.c
View file

@ -92,6 +92,12 @@ _notmuch_message_file_open (notmuch_database_t *notmuch,
return _notmuch_message_file_open_ctx (notmuch, NULL, filename);
}
const char *
_notmuch_message_file_get_filename (notmuch_message_file_t *message_file)
{
return message_file->filename;
}
void
_notmuch_message_file_close (notmuch_message_file_t *message)
{
@ -345,3 +351,83 @@ _notmuch_message_file_get_header (notmuch_message_file_t *message,
return decoded;
}
notmuch_status_t
_notmuch_message_file_get_headers (notmuch_message_file_t *message_file,
const char **from_out,
const char **subject_out,
const char **to_out,
const char **date_out,
char **message_id_out)
{
notmuch_status_t ret;
const char *header;
const char *from, *to, *subject, *date;
char *message_id = NULL;
/* Parse message up front to get better error status. */
ret = _notmuch_message_file_parse (message_file);
if (ret)
goto DONE;
/* Before we do any real work, (especially before doing a
* potential SHA-1 computation on the entire file's contents),
* let's make sure that what we're looking at looks like an
* actual email message.
*/
from = _notmuch_message_file_get_header (message_file, "from");
subject = _notmuch_message_file_get_header (message_file, "subject");
to = _notmuch_message_file_get_header (message_file, "to");
date = _notmuch_message_file_get_header (message_file, "date");
if ((from == NULL || *from == '\0') &&
(subject == NULL || *subject == '\0') &&
(to == NULL || *to == '\0')) {
ret = NOTMUCH_STATUS_FILE_NOT_EMAIL;
goto DONE;
}
/* Now that we're sure it's mail, the first order of business
* is to find a message ID (or else create one ourselves).
*/
header = _notmuch_message_file_get_header (message_file, "message-id");
if (header && *header != '\0') {
message_id = _notmuch_message_id_parse (message_file, header, NULL);
/* So the header value isn't RFC-compliant, but it's
* better than no message-id at all.
*/
if (message_id == NULL)
message_id = talloc_strdup (message_file, header);
}
if (message_id == NULL ) {
/* No message-id at all, let's generate one by taking a
* hash over the file's contents.
*/
char *sha1 = _notmuch_sha1_of_file (_notmuch_message_file_get_filename (message_file));
/* If that failed too, something is really wrong. Give up. */
if (sha1 == NULL) {
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
message_id = talloc_asprintf (message_file, "notmuch-sha1-%s", sha1);
free (sha1);
}
DONE:
if (ret == NOTMUCH_STATUS_SUCCESS) {
if (from_out)
*from_out = from;
if (subject_out)
*subject_out = subject;
if (to_out)
*to_out = to;
if (date_out)
*date_out = date;
if (message_id_out)
*message_id_out = message_id;
}
return ret;
}

11
lib/notmuch-private.h
View file

@ -425,6 +425,17 @@ const char *
_notmuch_message_file_get_header (notmuch_message_file_t *message,
const char *header);
notmuch_status_t
_notmuch_message_file_get_headers (notmuch_message_file_t *message_file,
const char **from_out,
const char **subject_out,
const char **to_out,
const char **date_out,
char **message_id_out);
const char *
_notmuch_message_file_get_filename (notmuch_message_file_t *message);
/* index.cc */
notmuch_status_t