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+ id 1XBL98-0006EF-Eg; Sun, 27 Jul 2014 10:53:44 +0100\r
+From: Mark Walters <markwalters1009@gmail.com>\r
+To: Austin Clements <amdragon@MIT.EDU>, notmuch@notmuchmail.org\r
+Subject: Re: [PATCH 05/14] lib: Database version 3: Introduce fine-grained\r
+ "features"\r
+In-Reply-To: <1406433173-19169-6-git-send-email-amdragon@mit.edu>\r
+References: <1406433173-19169-1-git-send-email-amdragon@mit.edu>\r
+ <1406433173-19169-6-git-send-email-amdragon@mit.edu>\r
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+Date: Sun, 27 Jul 2014 10:53:25 +0100\r
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+\r
+\r
+On Sun, 27 Jul 2014, Austin Clements <amdragon@MIT.EDU> wrote:\r
+> Previously, our database schema was versioned by a single number.\r
+> Each database schema change had to occur "atomically" in Notmuch's\r
+> development history: before some commit, Notmuch used version N, after\r
+> that commit, it used version N+1. Hence, each new schema version\r
+> could introduce only one change, the task of developing a schema\r
+> change fell on a single person, and it all had to happen and be\r
+> perfect in a single commit series. This made introducing a new schema\r
+> version hard. We've seen only two schema changes in the history of\r
+> Notmuch.\r
+\r
+I like this series as a whole and I am happy with all the patches that I\r
+haven't sent comments on. (Note, however, that I am not very familiar\r
+with the database code.)\r
+\r
+There is one thing which confuses me in this patch:\r
+\r
+>\r
+> This commit introduces database schema version 3; hopefully the last\r
+> schema version we'll need for a while. With this version, we switch\r
+> from a single version number to "features": a set of named,\r
+> independent aspects of the database schema.\r
+>\r
+> Features should make backwards compatibility easier. For many things,\r
+> it should be easy to support databases both with and without a\r
+> feature, which will allow us to make upgrades optional and will enable\r
+> "unstable" features that can be developed and tested over time.\r
+>\r
+> Features also make forwards compatibility easier. The features\r
+> recorded in a database include "compatibility flags," which can\r
+> indicate to an older version of Notmuch when it must support a given\r
+> feature to open the database for read or for write. This lets us\r
+> replace the old vague "I don't recognize this version, so something\r
+> might go wrong, but I promise to try my best" warnings upon opening a\r
+> database with an unknown version with precise errors. If a database\r
+> is safe to open for read/write despite unknown features, an older\r
+> version will know that and issue no message at all. If the database\r
+> is not safe to open for read/write because of unknown features, an\r
+> older version will know that, too, and can tell the user exactly which\r
+> required features it lacks support for.\r
+> ---\r
+> lib/database-private.h | 56 +++++++++++++++\r
+> lib/database.cc | 189 +++++++++++++++++++++++++++++++++++++++++--------\r
+> 2 files changed, 214 insertions(+), 31 deletions(-)\r
+>\r
+> diff --git a/lib/database-private.h b/lib/database-private.h\r
+> index d3e65fd..323b9fe 100644\r
+> --- a/lib/database-private.h\r
+> +++ b/lib/database-private.h\r
+> @@ -46,6 +46,11 @@ struct _notmuch_database {\r
+> int atomic_nesting;\r
+> Xapian::Database *xapian_db;\r
+> \r
+> + /* Bit mask of features used by this database. Features are\r
+> + * named, independent aspects of the database schema. This is a\r
+> + * bitwise-OR of NOTMUCH_FEATURE_* values (below). */\r
+> + unsigned int features;\r
+> +\r
+> unsigned int last_doc_id;\r
+> uint64_t last_thread_id;\r
+> \r
+> @@ -55,6 +60,57 @@ struct _notmuch_database {\r
+> Xapian::ValueRangeProcessor *date_range_processor;\r
+> };\r
+> \r
+> +/* Bit masks for _notmuch_database::features. */\r
+> +enum {\r
+> + /* If set, file names are stored in "file-direntry" terms. If\r
+> + * unset, file names are stored in document data.\r
+> + *\r
+> + * Introduced: version 1. Implementation support: both for read;\r
+> + * required for write. */\r
+> + NOTMUCH_FEATURE_FILE_TERMS = 1 << 0,\r
+> +\r
+> + /* If set, directory timestamps are stored in documents with\r
+> + * XDIRECTORY terms and relative paths. If unset, directory\r
+> + * timestamps are stored in documents with XTIMESTAMP terms and\r
+> + * absolute paths.\r
+> + *\r
+> + * Introduced: version 1. Implementation support: required. */\r
+> + NOTMUCH_FEATURE_DIRECTORY_DOCS = 1 << 1,\r
+> +\r
+> + /* If set, the from, subject, and message-id headers are stored in\r
+> + * message document values. If unset, message documents *may*\r
+> + * have these values, but if the value is empty, it must be\r
+> + * retrieved from the message file.\r
+> + *\r
+> + * Introduced: optional in version 1, required as of version 3.\r
+> + * Implementation support: both.\r
+> + */\r
+> + NOTMUCH_FEATURE_FROM_SUBJECT_ID_VALUES = 1 << 2,\r
+> +\r
+> + /* If set, folder terms are boolean and path terms exist. If\r
+> + * unset, folder terms are probabilistic and stemmed and path\r
+> + * terms do not exist.\r
+> + *\r
+> + * Introduced: version 2. Implementation support: required. */\r
+> + NOTMUCH_FEATURE_BOOL_FOLDER = 1 << 3,\r
+> +};\r
+> +\r
+> +/* Prior to database version 3, features were implied by the database\r
+> + * version number, so hard-code them for earlier versions. */\r
+> +#define NOTMUCH_FEATURES_V0 (0)\r
+> +#define NOTMUCH_FEATURES_V1 (NOTMUCH_FEATURES_V0 | NOTMUCH_FEATURE_FILE_TERMS | \\r
+> + NOTMUCH_FEATURE_DIRECTORY_DOCS)\r
+> +#define NOTMUCH_FEATURES_V2 (NOTMUCH_FEATURES_V1 | NOTMUCH_FEATURE_BOOL_FOLDER)\r
+> +\r
+> +/* Current database features. If any of these are missing from a\r
+> + * database, request an upgrade.\r
+> + * NOTMUCH_FEATURE_FROM_SUBJECT_ID_VALUES is not included because\r
+> + * upgrade doesn't currently introduce the feature (though brand new\r
+> + * databases will have it). */\r
+> +#define NOTMUCH_FEATURES_CURRENT \\r
+> + (NOTMUCH_FEATURE_FILE_TERMS | NOTMUCH_FEATURE_DIRECTORY_DOCS | \\r
+> + NOTMUCH_FEATURE_BOOL_FOLDER)\r
+> +\r
+> /* Return the list of terms from the given iterator matching a prefix.\r
+> * The prefix will be stripped from the strings in the returned list.\r
+> * The list will be allocated using ctx as the talloc context.\r
+> diff --git a/lib/database.cc b/lib/database.cc\r
+> index 45c4260..03eef3e 100644\r
+> --- a/lib/database.cc\r
+> +++ b/lib/database.cc\r
+> @@ -20,6 +20,7 @@\r
+> \r
+> #include "database-private.h"\r
+> #include "parse-time-vrp.h"\r
+> +#include "string-util.h"\r
+> \r
+> #include <iostream>\r
+> \r
+> @@ -42,7 +43,7 @@ typedef struct {\r
+> const char *prefix;\r
+> } prefix_t;\r
+> \r
+> -#define NOTMUCH_DATABASE_VERSION 2\r
+> +#define NOTMUCH_DATABASE_VERSION 3\r
+> \r
+> #define STRINGIFY(s) _SUB_STRINGIFY(s)\r
+> #define _SUB_STRINGIFY(s) #s\r
+> @@ -151,6 +152,17 @@ typedef struct {\r
+> * changes are made to the database (such as by\r
+> * indexing new fields).\r
+> *\r
+> + * features The set of features supported by this\r
+> + * database. This consists of a set of\r
+> + * '\n'-separated lines, where each is a feature\r
+> + * name, a '\t', and compatibility flags. If the\r
+> + * compatibility flags contain 'w', then the\r
+> + * opener must support this feature to safely\r
+> + * write this database. If the compatibility\r
+> + * flags contain 'r', then the opener must\r
+> + * support this feature to read this database.\r
+> + * Introduced in database version 3.\r
+> + *\r
+> * last_thread_id The last thread ID generated. This is stored\r
+> * as a 16-byte hexadecimal ASCII representation\r
+> * of a 64-bit unsigned integer. The first ID\r
+> @@ -226,6 +238,7 @@ static prefix_t PROBABILISTIC_PREFIX[]= {\r
+> { "subject", "XSUBJECT"},\r
+> };\r
+> \r
+> +\r
+> const char *\r
+> _find_prefix (const char *name)\r
+> {\r
+> @@ -251,6 +264,25 @@ _find_prefix (const char *name)\r
+> return "";\r
+> }\r
+> \r
+> +static const struct\r
+> +{\r
+> + /* NOTMUCH_FEATURE_* value. */\r
+> + unsigned int value;\r
+> + /* Feature name as it appears in the database. This name should\r
+> + * be appropriate for displaying to the user if an older version\r
+> + * of notmuch doesn't support this feature. */\r
+> + const char *name;\r
+> + /* Compatibility flags when this feature is declared. */\r
+> + const char *flags;\r
+> +} feature_names[] = {\r
+> + {NOTMUCH_FEATURE_FILE_TERMS, "file terms", "rw"},\r
+> + {NOTMUCH_FEATURE_DIRECTORY_DOCS, "directory documents", "rw"},\r
+> + /* Header values are not required for reading a database because a\r
+> + * reader can just refer to the message file. */\r
+> + {NOTMUCH_FEATURE_FROM_SUBJECT_ID_VALUES, "from/subject/ID values", "w"},\r
+> + {NOTMUCH_FEATURE_BOOL_FOLDER, "boolean folder terms", "rw"},\r
+> +};\r
+> +\r
+> const char *\r
+> notmuch_status_to_string (notmuch_status_t status)\r
+> {\r
+> @@ -591,6 +623,11 @@ notmuch_database_create (const char *path, notmuch_database_t **database)\r
+> ¬much);\r
+> if (status)\r
+> goto DONE;\r
+> +\r
+> + /* Upgrade doesn't add this feature to existing databases, but new\r
+> + * databases have it. */\r
+> + notmuch->features |= NOTMUCH_FEATURE_FROM_SUBJECT_ID_VALUES;\r
+> +\r
+\r
+Does this mean that if the user wants this feature he has to dump,\r
+delete the existing database, and restore? Is that just because no-one\r
+has implemented upgrade for this feature or is it "hard" in some sense?\r
+\r
+A possibly related question: is there likely to be a case where the user\r
+does not want to add/upgrade some feature? Would it be worth having an\r
+explicit upgrade command which let the user choose which features to\r
+upgrade? This is orthogonal to this series: I am just trying to get a\r
+feel for how it will, or could, be used.\r
+\r
+Best wishes\r
+\r
+Mark\r
+\r
+> status = notmuch_database_upgrade (notmuch, NULL, NULL);\r
+> if (status) {\r
+> notmuch_database_close(notmuch);\r
+> @@ -619,6 +656,80 @@ _notmuch_database_ensure_writable (notmuch_database_t *notmuch)\r
+> return NOTMUCH_STATUS_SUCCESS;\r
+> }\r
+> \r
+> +/* Parse a database features string from the given database version.\r
+> + *\r
+> + * For version < 3, this ignores the features string and returns a\r
+> + * hard-coded set of features.\r
+> + *\r
+> + * If there are unrecognized features that are required to open the\r
+> + * database in mode (which should be 'r' or 'w'), return a\r
+> + * comma-separated list of unrecognized but required features in\r
+> + * *incompat_out, which will be allocated from ctx.\r
+> + */\r
+> +static unsigned int\r
+> +_parse_features (const void *ctx, const char *features, unsigned int version,\r
+> + char mode, char **incompat_out)\r
+> +{\r
+> + unsigned int res = 0, namelen, i;\r
+> + size_t llen = 0;\r
+> + const char *flags;\r
+> +\r
+> + /* Prior to database version 3, features were implied by the\r
+> + * version number. */\r
+> + if (version == 0)\r
+> + return NOTMUCH_FEATURES_V0;\r
+> + else if (version == 1)\r
+> + return NOTMUCH_FEATURES_V1;\r
+> + else if (version == 2)\r
+> + return NOTMUCH_FEATURES_V2;\r
+> +\r
+> + /* Parse the features string */\r
+> + while ((features = strtok_len_c (features + llen, "\n", &llen)) != NULL) {\r
+> + flags = strchr (features, '\t');\r
+> + if (! flags || flags > features + llen)\r
+> + continue;\r
+> + namelen = flags - features;\r
+> +\r
+> + for (i = 0; i < ARRAY_SIZE (feature_names); ++i) {\r
+> + if (strlen (feature_names[i].name) == namelen &&\r
+> + strncmp (feature_names[i].name, features, namelen) == 0) {\r
+> + res |= feature_names[i].value;\r
+> + break;\r
+> + }\r
+> + }\r
+> +\r
+> + if (i == ARRAY_SIZE (feature_names)) {\r
+> + /* Unrecognized feature */\r
+> + const char *have = strchr (flags, mode);\r
+> + if (have && have < features + llen) {\r
+> + /* This feature is required to access this database in\r
+> + * 'mode', but we don't understand it. */\r
+> + if (! *incompat_out)\r
+> + *incompat_out = talloc_strdup (ctx, "");\r
+> + *incompat_out = talloc_asprintf_append_buffer (\r
+> + *incompat_out, "%s%.*s", **incompat_out ? ", " : "",\r
+> + namelen, features);\r
+> + }\r
+> + }\r
+> + }\r
+> +\r
+> + return res;\r
+> +}\r
+> +\r
+> +static char *\r
+> +_print_features (const void *ctx, unsigned int features)\r
+> +{\r
+> + unsigned int i;\r
+> + char *res = talloc_strdup (ctx, "");\r
+> +\r
+> + for (i = 0; i < ARRAY_SIZE (feature_names); ++i)\r
+> + if (features & feature_names[i].value)\r
+> + res = talloc_asprintf_append_buffer (\r
+> + res, "%s\t%s\n", feature_names[i].name, feature_names[i].flags);\r
+> +\r
+> + return res;\r
+> +}\r
+> +\r
+> notmuch_status_t\r
+> notmuch_database_open (const char *path,\r
+> notmuch_database_mode_t mode,\r
+> @@ -627,7 +738,7 @@ notmuch_database_open (const char *path,\r
+> notmuch_status_t status = NOTMUCH_STATUS_SUCCESS;\r
+> void *local = talloc_new (NULL);\r
+> notmuch_database_t *notmuch = NULL;\r
+> - char *notmuch_path, *xapian_path;\r
+> + char *notmuch_path, *xapian_path, *incompat_features;\r
+> struct stat st;\r
+> int err;\r
+> unsigned int i, version;\r
+> @@ -686,39 +797,51 @@ notmuch_database_open (const char *path,\r
+> if (mode == NOTMUCH_DATABASE_MODE_READ_WRITE) {\r
+> notmuch->xapian_db = new Xapian::WritableDatabase (xapian_path,\r
+> Xapian::DB_CREATE_OR_OPEN);\r
+> - version = notmuch_database_get_version (notmuch);\r
+> -\r
+> - if (version > NOTMUCH_DATABASE_VERSION) {\r
+> - fprintf (stderr,\r
+> - "Error: Notmuch database at %s\n"\r
+> - " has a newer database format version (%u) than supported by this\n"\r
+> - " version of notmuch (%u). Refusing to open this database in\n"\r
+> - " read-write mode.\n",\r
+> - notmuch_path, version, NOTMUCH_DATABASE_VERSION);\r
+> - notmuch->mode = NOTMUCH_DATABASE_MODE_READ_ONLY;\r
+> - notmuch_database_destroy (notmuch);\r
+> - notmuch = NULL;\r
+> - status = NOTMUCH_STATUS_FILE_ERROR;\r
+> - goto DONE;\r
+> - }\r
+> -\r
+> - if (version < NOTMUCH_DATABASE_VERSION)\r
+> - notmuch->needs_upgrade = TRUE;\r
+> } else {\r
+> notmuch->xapian_db = new Xapian::Database (xapian_path);\r
+> - version = notmuch_database_get_version (notmuch);\r
+> - if (version > NOTMUCH_DATABASE_VERSION)\r
+> - {\r
+> - fprintf (stderr,\r
+> - "Warning: Notmuch database at %s\n"\r
+> - " has a newer database format version (%u) than supported by this\n"\r
+> - " version of notmuch (%u). Some operations may behave incorrectly,\n"\r
+> - " (but the database will not be harmed since it is being opened\n"\r
+> - " in read-only mode).\n",\r
+> - notmuch_path, version, NOTMUCH_DATABASE_VERSION);\r
+> - }\r
+> }\r
+> \r
+> + /* Check version. As of database version 3, we represent\r
+> + * changes in terms of features, so assume a version bump\r
+> + * means a dramatically incompatible change. */\r
+> + version = notmuch_database_get_version (notmuch);\r
+> + if (version > NOTMUCH_DATABASE_VERSION) {\r
+> + fprintf (stderr,\r
+> + "Error: Notmuch database at %s\n"\r
+> + " has a newer database format version (%u) than supported by this\n"\r
+> + " version of notmuch (%u).\n",\r
+> + notmuch_path, version, NOTMUCH_DATABASE_VERSION);\r
+> + notmuch->mode = NOTMUCH_DATABASE_MODE_READ_ONLY;\r
+> + notmuch_database_destroy (notmuch);\r
+> + notmuch = NULL;\r
+> + status = NOTMUCH_STATUS_FILE_ERROR;\r
+> + goto DONE;\r
+> + }\r
+> +\r
+> + /* Check features. */\r
+> + incompat_features = NULL;\r
+> + notmuch->features = _parse_features (\r
+> + local, notmuch->xapian_db->get_metadata ("features").c_str (),\r
+> + version, mode == NOTMUCH_DATABASE_MODE_READ_WRITE ? 'w' : 'r',\r
+> + &incompat_features);\r
+> + if (incompat_features) {\r
+> + fprintf (stderr,\r
+> + "Error: Notmuch database at %s\n"\r
+> + " requires features (%s)\n"\r
+> + " not supported by this version of notmuch.\n",\r
+> + notmuch_path, incompat_features);\r
+> + notmuch->mode = NOTMUCH_DATABASE_MODE_READ_ONLY;\r
+> + notmuch_database_destroy (notmuch);\r
+> + notmuch = NULL;\r
+> + status = NOTMUCH_STATUS_FILE_ERROR;\r
+> + goto DONE;\r
+> + }\r
+> +\r
+> + /* Do we want an upgrade? */\r
+> + if (mode == NOTMUCH_DATABASE_MODE_READ_WRITE &&\r
+> + NOTMUCH_FEATURES_CURRENT & ~notmuch->features)\r
+> + notmuch->needs_upgrade = TRUE;\r
+> +\r
+> notmuch->last_doc_id = notmuch->xapian_db->get_lastdocid ();\r
+> last_thread_id = notmuch->xapian_db->get_metadata ("last_thread_id");\r
+> if (last_thread_id.empty ()) {\r
+> @@ -1077,6 +1200,7 @@ notmuch_database_upgrade (notmuch_database_t *notmuch,\r
+> double progress),\r
+> void *closure)\r
+> {\r
+> + void *local = talloc_new (NULL);\r
+> Xapian::WritableDatabase *db;\r
+> struct sigaction action;\r
+> struct itimerval timerval;\r
+> @@ -1226,6 +1350,8 @@ notmuch_database_upgrade (notmuch_database_t *notmuch,\r
+> notmuch_query_destroy (query);\r
+> }\r
+> \r
+> + notmuch->features |= NOTMUCH_FEATURES_CURRENT;\r
+> + db->set_metadata ("features", _print_features (local, notmuch->features));\r
+> db->set_metadata ("version", STRINGIFY (NOTMUCH_DATABASE_VERSION));\r
+> db->flush ();\r
+> \r
+> @@ -1302,6 +1428,7 @@ notmuch_database_upgrade (notmuch_database_t *notmuch,\r
+> sigaction (SIGALRM, &action, NULL);\r
+> }\r
+> \r
+> + talloc_free (local);\r
+> return NOTMUCH_STATUS_SUCCESS;\r
+> }\r
+> \r
+> -- \r
+> 2.0.0\r
+>\r
+> _______________________________________________\r
+> notmuch mailing list\r
+> notmuch@notmuchmail.org\r
+> http://notmuchmail.org/mailman/listinfo/notmuch\r
projects / notmuch-archives.git / commitdiff