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+From: Austin Clements <amdragon@MIT.EDU>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH 05/14] lib: Database version 3: Introduce fine-grained\r
+ "features"\r
+Date: Sat, 26 Jul 2014 23:52:44 -0400\r
+Message-Id: <1406433173-19169-6-git-send-email-amdragon@mit.edu>\r
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+\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
+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
+ 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
projects / notmuch-archives.git / commitdiff