From: Austin Clements Date: Mon, 13 Oct 2014 06:20:02 +0000 (+2000) Subject: [WIP PATCH 3/4] lib: API to retrieve database revision and UUID X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=fe60530e5eb35a51a23e790c9fcdc8745aea7a84;p=notmuch-archives.git [WIP PATCH 3/4] lib: API to retrieve database revision and UUID --- diff --git a/64/97e1a3986b6a46c97a9aff7b712392fbe60342 b/64/97e1a3986b6a46c97a9aff7b712392fbe60342 new file mode 100644 index 000000000..fc5bdc2dc --- /dev/null +++ b/64/97e1a3986b6a46c97a9aff7b712392fbe60342 @@ -0,0 +1,157 @@ +Return-Path: +X-Original-To: notmuch@notmuchmail.org +Delivered-To: notmuch@notmuchmail.org +Received: from localhost (localhost [127.0.0.1]) + by olra.theworths.org (Postfix) with ESMTP id 11A88431FC4 + for ; Sun, 12 Oct 2014 23:20:23 -0700 (PDT) +X-Virus-Scanned: Debian amavisd-new at olra.theworths.org +X-Spam-Flag: NO +X-Spam-Score: -2.3 +X-Spam-Level: +X-Spam-Status: No, score=-2.3 tagged_above=-999 required=5 + tests=[RCVD_IN_DNSWL_MED=-2.3] autolearn=disabled +Received: from olra.theworths.org ([127.0.0.1]) + by localhost (olra.theworths.org [127.0.0.1]) (amavisd-new, port 10024) + with ESMTP id CpgXZeBr3HDH for ; 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+ Mon, 13 Oct 2014 02:20:07 -0400 +Received: from amthrax by drake.dyndns.org with local (Exim 4.84) + (envelope-from ) + id 1XdYzF-0000UG-AX; Mon, 13 Oct 2014 02:20:05 -0400 +From: Austin Clements +To: notmuch@notmuchmail.org +Subject: [WIP PATCH 3/4] lib: API to retrieve database revision and UUID +Date: Mon, 13 Oct 2014 02:20:02 -0400 +Message-Id: <1413181203-1676-4-git-send-email-aclements@csail.mit.edu> +X-Mailer: git-send-email 2.1.0 +In-Reply-To: <1413181203-1676-1-git-send-email-aclements@csail.mit.edu> +References: <1413181203-1676-1-git-send-email-aclements@csail.mit.edu> +X-Brightmail-Tracker: + H4sIAAAAAAAAA+NgFtrEIsWRmVeSWpSXmKPExsUixCmqrSudbx1i0LxW3OL6zZnMDowez1bd + Yg5gjOKySUnNySxLLdK3S+DK2LrhClPBDbGKFe9eMTUwzhLqYuTkkBAwkbj5ejkzhC0mceHe + erYuRi4OIYHZTBK/jl9hhHA2Mkp03N7OClIlJLCcSeLU/1KIxBJGiRuvNjKBJNgE9CVWrJ0E + ViQiIC2x8+5sIJuDg1lAV6K5XRkkLCzgIfFlZwcLiM0ioCpx8GwDO4jNK+Am0TJ9A9QVchIb + dv9nBLE5BdwlLk48ywyx103iWNs1lgmM/AsYGVYxyqbkVunmJmbmFKcm6xYnJ+blpRbpWujl + ZpbopaaUbmIEBQ27i+oOxgmHlA4xCnAwKvHwWvyxChFiTSwrrsw9xCjJwaQkyhuQZh0ixJeU + n1KZkVicEV9UmpNafIhRgoNZSYT3rQ1QjjclsbIqtSgfJiXNwaIkzrvpB1+IkEB6Yklqdmpq + QWoRTFaGg0NJgvdENlCjYFFqempFWmZOCUKaiYMTZDgP0HApkBre4oLE3OLMdIj8KUZFKXHe + q1lACQGQREZpHlwvLKpfMYoDvSLMGwjSzgNMCHDdr4AGMwENPtplDjK4JBEhJdXAuNzSssXr + yr7yQLf2qf94DQ+8u+OVp/Mquudx78J/7cpbPuvcVbX+WbT8IKtN+azDXzbIrLfnen7WYsOP + TZecX/ZHz/WZfHHpZptQhY8SR+Ysjz1yJNv48H0V/RM7NJe+/+sTLfOYYYfuV9mA/UVRf1M5 + n+9UCrllfdsoiG1yWsv96bG5hxvlHJRYijMSDbWYi4oTAVlYbiLFAgAA +Cc: Austin Clements +X-BeenThere: notmuch@notmuchmail.org +X-Mailman-Version: 2.1.13 +Precedence: list +List-Id: "Use and development of the notmuch mail system." + +List-Unsubscribe: , + +List-Archive: +List-Post: +List-Help: +List-Subscribe: , + +X-List-Received-Date: Mon, 13 Oct 2014 06:20:23 -0000 + +This exposes the committed database revision to library users along +with a UUID that can be used to detect when revision numbers are no +longer comparable (e.g., because the database has been replaced). +--- + lib/database-private.h | 1 + + lib/database.cc | 11 +++++++++++ + lib/notmuch.h | 18 ++++++++++++++++++ + 3 files changed, 30 insertions(+) + +diff --git a/lib/database-private.h b/lib/database-private.h +index 465065d..0977229 100644 +--- a/lib/database-private.h ++++ b/lib/database-private.h +@@ -157,6 +157,7 @@ struct _notmuch_database { + * under a higher revision number, which can be generated with + * notmuch_database_new_revision. */ + unsigned long revision; ++ const char *uuid; + + Xapian::QueryParser *query_parser; + Xapian::TermGenerator *term_gen; +diff --git a/lib/database.cc b/lib/database.cc +index 45d32ab..9bec170 100644 +--- a/lib/database.cc ++++ b/lib/database.cc +@@ -905,6 +905,8 @@ notmuch_database_open (const char *path, + notmuch->revision = 0; + else + notmuch->revision = Xapian::sortable_unserialise (last_mod); ++ notmuch->uuid = talloc_strdup ( ++ notmuch, notmuch->xapian_db->get_uuid ().c_str ()); + + notmuch->query_parser = new Xapian::QueryParser; + notmuch->term_gen = new Xapian::TermGenerator; +@@ -1562,6 +1564,15 @@ DONE: + return NOTMUCH_STATUS_SUCCESS; + } + ++unsigned long ++notmuch_database_get_revisison (notmuch_database_t *notmuch, ++ const char **uuid) ++{ ++ if (*uuid) ++ *uuid = notmuch->uuid; ++ return notmuch->revision; ++} ++ + /* 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. +diff --git a/lib/notmuch.h b/lib/notmuch.h +index 92594b9..898f7b9 100644 +--- a/lib/notmuch.h ++++ b/lib/notmuch.h +@@ -433,6 +433,24 @@ notmuch_status_t + notmuch_database_end_atomic (notmuch_database_t *notmuch); + + /** ++ * Return the committed database revision and UUID. ++ * ++ * The database revision number increases monotonically with each ++ * commit to the database. Hence, all messages and message changes ++ * committed to the database (that is, visible to readers) have a last ++ * modification revision <= the committed database revision. Any ++ * messages committed in the future will be assigned a modification ++ * revision > the committed database revision. ++ * ++ * The UUID is a NUL-terminated opaque string that uniquely identifies ++ * this database. Two revision numbers are only comparable if they ++ * have the same database UUID. ++ */ ++unsigned long ++notmuch_database_get_revisison (notmuch_database_t *notmuch, ++ const char **uuid); ++ ++/** + * Retrieve a directory object from the database for 'path'. + * + * Here, 'path' should be a path relative to the path of 'database' +-- +2.1.0 +