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notmuch/lib/database.cc
David Bremner 2717ff96a7 lib: drop comment about only indexing one file. 
Although the situation is complicated by the value fields (which are
taken from a single file), this comment is now more false than true.
2019-03-31 11:59:46 -03:00

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/* database.cc - The database interfaces of the notmuch mail library
*
* Copyright © 2009 Carl Worth
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see https://www.gnu.org/licenses/ .
*
* Author: Carl Worth <cworth@cworth.org>
*/
#include "database-private.h"
#include "parse-time-vrp.h"
#include "query-fp.h"
#include "thread-fp.h"
#include "regexp-fields.h"
#include "string-util.h"
#include <iostream>
#include <sys/time.h>
#include <sys/stat.h>
#include <signal.h>
#include <ftw.h>
#include <glib.h> /* g_free, GPtrArray, GHashTable */
#include <glib-object.h> /* g_type_init */
#include <gmime/gmime.h> /* g_mime_init */
using namespace std;
#define ARRAY_SIZE(arr) (sizeof (arr) / sizeof (arr[0]))
typedef struct {
const char *name;
const char *prefix;
notmuch_field_flag_t flags;
} prefix_t;
#define NOTMUCH_DATABASE_VERSION 3
#define STRINGIFY(s) _SUB_STRINGIFY(s)
#define _SUB_STRINGIFY(s) #s
#if HAVE_XAPIAN_DB_RETRY_LOCK
#define DB_ACTION (Xapian::DB_CREATE_OR_OPEN | Xapian::DB_RETRY_LOCK)
#else
#define DB_ACTION Xapian::DB_CREATE_OR_OPEN
#endif
/* Here's the current schema for our database (for NOTMUCH_DATABASE_VERSION):
*
* We currently have three different types of documents (mail, ghost,
* and directory) and also some metadata.
*
* Mail document
* -------------
* A mail document is associated with a particular email message. It
* is stored in one or more files on disk and is uniquely identified
* by its "id" field (which is generally the message ID). It is
* indexed with the following prefixed terms which the database uses
* to construct threads, etc.:
*
* Single terms of given prefix:
*
* type: mail
*
* id: Unique ID of mail. This is from the Message-ID header
* if present and not too long (see NOTMUCH_MESSAGE_ID_MAX).
* If it's present and too long, then we use
* "notmuch-sha1-<sha1_sum_of_message_id>".
* If this header is not present, we use
* "notmuch-sha1-<sha1_sum_of_entire_file>".
*
* thread: The ID of the thread to which the mail belongs
*
* replyto: The ID from the In-Reply-To header of the mail (if any).
*
* Multiple terms of given prefix:
*
* reference: All message IDs from In-Reply-To and References
* headers in the message.
*
* tag: Any tags associated with this message by the user.
*
* file-direntry: A colon-separated pair of values
* (INTEGER:STRING), where INTEGER is the
* document ID of a directory document, and
* STRING is the name of a file within that
* directory for this mail message.
*
* property: Has a property with key=value
* FIXME: if no = is present, should match on any value
*
* A mail document also has four values:
*
* TIMESTAMP: The time_t value corresponding to the message's
* Date header.
*
* MESSAGE_ID: The unique ID of the mail mess (see "id" above)
*
* FROM: The value of the "From" header
*
* SUBJECT: The value of the "Subject" header
*
* LAST_MOD: The revision number as of the last tag or
* filename change.
*
* In addition, terms from the content of the message are added with
* "from", "to", "attachment", and "subject" prefixes for use by the
* user in searching. Similarly, terms from the path of the mail
* message are added with "folder" and "path" prefixes. But the
* database doesn't really care itself about any of these.
*
* The data portion of a mail document is empty.
*
* Ghost mail document [if NOTMUCH_FEATURE_GHOSTS]
* -----------------------------------------------
* A ghost mail document is like a mail document, but where we don't
* have the message content. These are used to track thread reference
* information for messages we haven't received.
*
* A ghost mail document has type: ghost; id and thread fields that
* are identical to the mail document fields; and a MESSAGE_ID value.
*
* Directory document
* ------------------
* A directory document is used by a client of the notmuch library to
* maintain data necessary to allow for efficient polling of mail
* directories.
*
* All directory documents contain one term:
*
* directory: The directory path (relative to the database path)
* Or the SHA1 sum of the directory path (if the
* path itself is too long to fit in a Xapian
* term).
*
* And all directory documents for directories other than top-level
* directories also contain the following term:
*
* directory-direntry: A colon-separated pair of values
* (INTEGER:STRING), where INTEGER is the
* document ID of the parent directory
* document, and STRING is the name of this
* directory within that parent.
*
* All directory documents have a single value:
*
* TIMESTAMP: The mtime of the directory (at last scan)
*
* The data portion of a directory document contains the path of the
* directory (relative to the database path).
*
* Database metadata
* -----------------
* Xapian allows us to store arbitrary name-value pairs as
* "metadata". We currently use the following metadata names with the
* given meanings:
*
* version The database schema version, (which is distinct
* from both the notmuch package version (see
* notmuch --version) and the libnotmuch library
* version. The version is stored as an base-10
* ASCII integer. The initial database version
* was 1, (though a schema existed before that
* were no "version" database value existed at
* all). Successive versions are allocated as
* changes are made to the database (such as by
* indexing new fields).
*
* features The set of features supported by this
* database. This consists of a set of
* '\n'-separated lines, where each is a feature
* name, a '\t', and compatibility flags. If the
* compatibility flags contain 'w', then the
* opener must support this feature to safely
* write this database. If the compatibility
* flags contain 'r', then the opener must
* support this feature to read this database.
* Introduced in database version 3.
*
* last_thread_id The last thread ID generated. This is stored
* as a 16-byte hexadecimal ASCII representation
* of a 64-bit unsigned integer. The first ID
* generated is 1 and the value will be
* incremented for each thread ID.
*
* C* metadata keys starting with C indicate
* configuration data. It can be managed with the
* n_database_*config* API. There is a convention
* of hierarchical keys separated by '.' (e.g.
* query.notmuch stores the value for the named
* query 'notmuch'), but it is not enforced by the
* API.
*
* Obsolete metadata
* -----------------
*
* If ! NOTMUCH_FEATURE_GHOSTS, there are no ghost mail documents.
* Instead, the database has the following additional database
* metadata:
*
* thread_id_* A pre-allocated thread ID for a particular
* message. This is actually an arbitrarily large
* family of metadata name. Any particular name is
* formed by concatenating "thread_id_" with a message
* ID (or the SHA1 sum of a message ID if it is very
* long---see description of 'id' in the mail
* document). The value stored is a thread ID.
*
* These thread ID metadata values are stored
* whenever a message references a parent message
* that does not yet exist in the database. A
* thread ID will be allocated and stored, and if
* the message is later added, the stored thread
* ID will be used (and the metadata value will
* be cleared).
*
* Even before a message is added, it's
* pre-allocated thread ID is useful so that all
* descendant messages that reference this common
* parent can be recognized as belonging to the
* same thread.
*/
/* With these prefix values we follow the conventions published here:
*
* https://xapian.org/docs/omega/termprefixes.html
*
* as much as makes sense. Note that I took some liberty in matching
* the reserved prefix values to notmuch concepts, (for example, 'G'
* is documented as "newsGroup (or similar entity - e.g. a web forum
* name)", for which I think the thread is the closest analogue in
* notmuch. This in spite of the fact that we will eventually be
* storing mailing-list messages where 'G' for "mailing list name"
* might be even a closer analogue. I'm treating the single-character
* prefixes preferentially for core notmuch concepts (which will be
* nearly universal to all mail messages).
*/
static const
prefix_t prefix_table[] = {
/* name term prefix flags */
{ "type", "T", NOTMUCH_FIELD_NO_FLAGS },
{ "reference", "XREFERENCE", NOTMUCH_FIELD_NO_FLAGS },
{ "replyto", "XREPLYTO", NOTMUCH_FIELD_NO_FLAGS },
{ "directory", "XDIRECTORY", NOTMUCH_FIELD_NO_FLAGS },
{ "file-direntry", "XFDIRENTRY", NOTMUCH_FIELD_NO_FLAGS },
{ "directory-direntry", "XDDIRENTRY", NOTMUCH_FIELD_NO_FLAGS },
{ "thread", "G", NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROCESSOR },
{ "tag", "K", NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROCESSOR },
{ "is", "K", NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROCESSOR },
{ "id", "Q", NOTMUCH_FIELD_EXTERNAL },
{ "mid", "Q", NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROCESSOR },
{ "path", "P", NOTMUCH_FIELD_EXTERNAL|
NOTMUCH_FIELD_PROCESSOR },
{ "property", "XPROPERTY", NOTMUCH_FIELD_EXTERNAL },
/*
* Unconditionally add ':' to reduce potential ambiguity with
* overlapping prefixes and/or terms that start with capital
* letters. See Xapian document termprefixes.html for related
* discussion.
*/
{ "folder", "XFOLDER:", NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROCESSOR },
#if HAVE_XAPIAN_FIELD_PROCESSOR
{ "date", NULL, NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROCESSOR },
{ "query", NULL, NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROCESSOR },
#endif
{ "from", "XFROM", NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROBABILISTIC |
NOTMUCH_FIELD_PROCESSOR },
{ "to", "XTO", NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROBABILISTIC },
{ "attachment", "XATTACHMENT", NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROBABILISTIC },
{ "mimetype", "XMIMETYPE", NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROBABILISTIC },
{ "subject", "XSUBJECT", NOTMUCH_FIELD_EXTERNAL |
NOTMUCH_FIELD_PROBABILISTIC |
NOTMUCH_FIELD_PROCESSOR},
};
static void
_setup_query_field_default (const prefix_t *prefix, notmuch_database_t *notmuch)
{
if (prefix->flags & NOTMUCH_FIELD_PROBABILISTIC)
notmuch->query_parser->add_prefix (prefix->name, prefix->prefix);
else
notmuch->query_parser->add_boolean_prefix (prefix->name, prefix->prefix);
}
#if HAVE_XAPIAN_FIELD_PROCESSOR
static void
_setup_query_field (const prefix_t *prefix, notmuch_database_t *notmuch)
{
if (prefix->flags & NOTMUCH_FIELD_PROCESSOR) {
Xapian::FieldProcessor *fp;
if (STRNCMP_LITERAL (prefix->name, "date") == 0)
fp = (new DateFieldProcessor())->release ();
else if (STRNCMP_LITERAL(prefix->name, "query") == 0)
fp = (new QueryFieldProcessor (*notmuch->query_parser, notmuch))->release ();
else if (STRNCMP_LITERAL(prefix->name, "thread") == 0)
fp = (new ThreadFieldProcessor (*notmuch->query_parser, notmuch))->release ();
else
fp = (new RegexpFieldProcessor (prefix->name, prefix->flags,
*notmuch->query_parser, notmuch))->release ();
/* we treat all field-processor fields as boolean in order to get the raw input */
notmuch->query_parser->add_boolean_prefix (prefix->name, fp);
} else {
_setup_query_field_default (prefix, notmuch);
}
}
#else
static inline void
_setup_query_field (const prefix_t *prefix, notmuch_database_t *notmuch)
{
_setup_query_field_default (prefix, notmuch);
}
#endif
const char *
_find_prefix (const char *name)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE (prefix_table); i++) {
if (strcmp (name, prefix_table[i].name) == 0)
return prefix_table[i].prefix;
}
INTERNAL_ERROR ("No prefix exists for '%s'\n", name);
return "";
}
static const struct {
/* NOTMUCH_FEATURE_* value. */
_notmuch_features value;
/* Feature name as it appears in the database. This name should
* be appropriate for displaying to the user if an older version
* of notmuch doesn't support this feature. */
const char *name;
/* Compatibility flags when this feature is declared. */
const char *flags;
} feature_names[] = {
{ NOTMUCH_FEATURE_FILE_TERMS,
"multiple paths per message", "rw" },
{ NOTMUCH_FEATURE_DIRECTORY_DOCS,
"relative directory paths", "rw" },
/* Header values are not required for reading a database because a
* reader can just refer to the message file. */
{ NOTMUCH_FEATURE_FROM_SUBJECT_ID_VALUES,
"from/subject/message-ID in database", "w" },
{ NOTMUCH_FEATURE_BOOL_FOLDER,
"exact folder:/path: search", "rw" },
{ NOTMUCH_FEATURE_GHOSTS,
"mail documents for missing messages", "w"},
/* Knowledge of the index mime-types are not required for reading
* a database because a reader will just be unable to query
* them. */
{ NOTMUCH_FEATURE_INDEXED_MIMETYPES,
"indexed MIME types", "w"},
{ NOTMUCH_FEATURE_LAST_MOD,
"modification tracking", "w"},
};
const char *
notmuch_status_to_string (notmuch_status_t status)
{
switch (status) {
case NOTMUCH_STATUS_SUCCESS:
return "No error occurred";
case NOTMUCH_STATUS_OUT_OF_MEMORY:
return "Out of memory";
case NOTMUCH_STATUS_READ_ONLY_DATABASE:
return "Attempt to write to a read-only database";
case NOTMUCH_STATUS_XAPIAN_EXCEPTION:
return "A Xapian exception occurred";
case NOTMUCH_STATUS_FILE_ERROR:
return "Something went wrong trying to read or write a file";
case NOTMUCH_STATUS_FILE_NOT_EMAIL:
return "File is not an email";
case NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID:
return "Message ID is identical to a message in database";
case NOTMUCH_STATUS_NULL_POINTER:
return "Erroneous NULL pointer";
case NOTMUCH_STATUS_TAG_TOO_LONG:
return "Tag value is too long (exceeds NOTMUCH_TAG_MAX)";
case NOTMUCH_STATUS_UNBALANCED_FREEZE_THAW:
return "Unbalanced number of calls to notmuch_message_freeze/thaw";
case NOTMUCH_STATUS_UNBALANCED_ATOMIC:
return "Unbalanced number of calls to notmuch_database_begin_atomic/end_atomic";
case NOTMUCH_STATUS_UNSUPPORTED_OPERATION:
return "Unsupported operation";
case NOTMUCH_STATUS_UPGRADE_REQUIRED:
return "Operation requires a database upgrade";
case NOTMUCH_STATUS_PATH_ERROR:
return "Path supplied is illegal for this function";
case NOTMUCH_STATUS_MALFORMED_CRYPTO_PROTOCOL:
return "Crypto protocol missing, malformed, or unintelligible";
case NOTMUCH_STATUS_FAILED_CRYPTO_CONTEXT_CREATION:
return "Crypto engine initialization failure";
case NOTMUCH_STATUS_UNKNOWN_CRYPTO_PROTOCOL:
return "Unknown crypto protocol";
default:
case NOTMUCH_STATUS_LAST_STATUS:
return "Unknown error status value";
}
}
void
_notmuch_database_log (notmuch_database_t *notmuch,
const char *format,
...)
{
va_list va_args;
va_start (va_args, format);
if (notmuch->status_string)
talloc_free (notmuch->status_string);
notmuch->status_string = talloc_vasprintf (notmuch, format, va_args);
va_end (va_args);
}
void
_notmuch_database_log_append (notmuch_database_t *notmuch,
const char *format,
...)
{
va_list va_args;
va_start (va_args, format);
if (notmuch->status_string)
notmuch->status_string = talloc_vasprintf_append (notmuch->status_string, format, va_args);
else
notmuch->status_string = talloc_vasprintf (notmuch, format, va_args);
va_end (va_args);
}
static void
find_doc_ids_for_term (notmuch_database_t *notmuch,
const char *term,
Xapian::PostingIterator *begin,
Xapian::PostingIterator *end)
{
*begin = notmuch->xapian_db->postlist_begin (term);
*end = notmuch->xapian_db->postlist_end (term);
}
void
_notmuch_database_find_doc_ids (notmuch_database_t *notmuch,
const char *prefix_name,
const char *value,
Xapian::PostingIterator *begin,
Xapian::PostingIterator *end)
{
char *term;
term = talloc_asprintf (notmuch, "%s%s",
_find_prefix (prefix_name), value);
find_doc_ids_for_term (notmuch, term, begin, end);
talloc_free (term);
}
notmuch_private_status_t
_notmuch_database_find_unique_doc_id (notmuch_database_t *notmuch,
const char *prefix_name,
const char *value,
unsigned int *doc_id)
{
Xapian::PostingIterator i, end;
_notmuch_database_find_doc_ids (notmuch, prefix_name, value, &i, &end);
if (i == end) {
*doc_id = 0;
return NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND;
}
*doc_id = *i;
#if DEBUG_DATABASE_SANITY
i++;
if (i != end)
INTERNAL_ERROR ("Term %s:%s is not unique as expected.\n",
prefix_name, value);
#endif
return NOTMUCH_PRIVATE_STATUS_SUCCESS;
}
static Xapian::Document
find_document_for_doc_id (notmuch_database_t *notmuch, unsigned doc_id)
{
return notmuch->xapian_db->get_document (doc_id);
}
/* Generate a compressed version of 'message_id' of the form:
*
* notmuch-sha1-<sha1_sum_of_message_id>
*/
char *
_notmuch_message_id_compressed (void *ctx, const char *message_id)
{
char *sha1, *compressed;
sha1 = _notmuch_sha1_of_string (message_id);
compressed = talloc_asprintf (ctx, "notmuch-sha1-%s", sha1);
free (sha1);
return compressed;
}
notmuch_status_t
notmuch_database_find_message (notmuch_database_t *notmuch,
const char *message_id,
notmuch_message_t **message_ret)
{
notmuch_private_status_t status;
unsigned int doc_id;
if (message_ret == NULL)
return NOTMUCH_STATUS_NULL_POINTER;
if (strlen (message_id) > NOTMUCH_MESSAGE_ID_MAX)
message_id = _notmuch_message_id_compressed (notmuch, message_id);
try {
status = _notmuch_database_find_unique_doc_id (notmuch, "id",
message_id, &doc_id);
if (status == NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND)
*message_ret = NULL;
else {
*message_ret = _notmuch_message_create (notmuch, notmuch, doc_id,
NULL);
if (*message_ret == NULL)
return NOTMUCH_STATUS_OUT_OF_MEMORY;
}
return NOTMUCH_STATUS_SUCCESS;
} catch (const Xapian::Error &error) {
_notmuch_database_log (notmuch, "A Xapian exception occurred finding message: %s.\n",
error.get_msg().c_str());
notmuch->exception_reported = true;
*message_ret = NULL;
return NOTMUCH_STATUS_XAPIAN_EXCEPTION;
}
}
notmuch_status_t
notmuch_database_create (const char *path, notmuch_database_t **database)
{
char *status_string = NULL;
notmuch_status_t status;
status = notmuch_database_create_verbose (path, database,
&status_string);
if (status_string) {
fputs (status_string, stderr);
free (status_string);
}
return status;
}
notmuch_status_t
notmuch_database_create_verbose (const char *path,
notmuch_database_t **database,
char **status_string)
{
notmuch_status_t status = NOTMUCH_STATUS_SUCCESS;
notmuch_database_t *notmuch = NULL;
char *notmuch_path = NULL;
char *message = NULL;
struct stat st;
int err;
if (path == NULL) {
message = strdup ("Error: Cannot create a database for a NULL path.\n");
status = NOTMUCH_STATUS_NULL_POINTER;
goto DONE;
}
if (path[0] != '/') {
message = strdup ("Error: Database path must be absolute.\n");
status = NOTMUCH_STATUS_PATH_ERROR;
goto DONE;
}
err = stat (path, &st);
if (err) {
IGNORE_RESULT (asprintf (&message, "Error: Cannot create database at %s: %s.\n",
path, strerror (errno)));
status = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
if (! S_ISDIR (st.st_mode)) {
IGNORE_RESULT (asprintf (&message, "Error: Cannot create database at %s: "
"Not a directory.\n",
path));
status = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
notmuch_path = talloc_asprintf (NULL, "%s/%s", path, ".notmuch");
err = mkdir (notmuch_path, 0755);
if (err) {
IGNORE_RESULT (asprintf (&message, "Error: Cannot create directory %s: %s.\n",
notmuch_path, strerror (errno)));
status = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
status = notmuch_database_open_verbose (path,
NOTMUCH_DATABASE_MODE_READ_WRITE,
&notmuch, &message);
if (status)
goto DONE;
/* Upgrade doesn't add these feature to existing databases, but
* new databases have them. */
notmuch->features |= NOTMUCH_FEATURE_FROM_SUBJECT_ID_VALUES;
notmuch->features |= NOTMUCH_FEATURE_INDEXED_MIMETYPES;
status = notmuch_database_upgrade (notmuch, NULL, NULL);
if (status) {
notmuch_database_close(notmuch);
notmuch = NULL;
}
DONE:
if (notmuch_path)
talloc_free (notmuch_path);
if (message) {
if (status_string)
*status_string = message;
else
free (message);
}
if (database)
*database = notmuch;
else
talloc_free (notmuch);
return status;
}
notmuch_status_t
_notmuch_database_ensure_writable (notmuch_database_t *notmuch)
{
if (notmuch->mode == NOTMUCH_DATABASE_MODE_READ_ONLY) {
_notmuch_database_log (notmuch, "Cannot write to a read-only database.\n");
return NOTMUCH_STATUS_READ_ONLY_DATABASE;
}
return NOTMUCH_STATUS_SUCCESS;
}
/* Allocate a revision number for the next change. */
unsigned long
_notmuch_database_new_revision (notmuch_database_t *notmuch)
{
unsigned long new_revision = notmuch->revision + 1;
/* If we're in an atomic section, hold off on updating the
* committed revision number until we commit the atomic section.
*/
if (notmuch->atomic_nesting)
notmuch->atomic_dirty = true;
else
notmuch->revision = new_revision;
return new_revision;
}
/* Parse a database features string from the given database version.
* Returns the feature bit set.
*
* For version < 3, this ignores the features string and returns a
* hard-coded set of features.
*
* If there are unrecognized features that are required to open the
* database in mode (which should be 'r' or 'w'), return a
* comma-separated list of unrecognized but required features in
* *incompat_out suitable for presenting to the user. *incompat_out
* will be allocated from ctx.
*/
static _notmuch_features
_parse_features (const void *ctx, const char *features, unsigned int version,
char mode, char **incompat_out)
{
_notmuch_features res = static_cast<_notmuch_features>(0);
unsigned int namelen, i;
size_t llen = 0;
const char *flags;
/* Prior to database version 3, features were implied by the
* version number. */
if (version == 0)
return NOTMUCH_FEATURES_V0;
else if (version == 1)
return NOTMUCH_FEATURES_V1;
else if (version == 2)
return NOTMUCH_FEATURES_V2;
/* Parse the features string */
while ((features = strtok_len_c (features + llen, "\n", &llen)) != NULL) {
flags = strchr (features, '\t');
if (! flags || flags > features + llen)
continue;
namelen = flags - features;
for (i = 0; i < ARRAY_SIZE (feature_names); ++i) {
if (strlen (feature_names[i].name) == namelen &&
strncmp (feature_names[i].name, features, namelen) == 0) {
res |= feature_names[i].value;
break;
}
}
if (i == ARRAY_SIZE (feature_names) && incompat_out) {
/* Unrecognized feature */
const char *have = strchr (flags, mode);
if (have && have < features + llen) {
/* This feature is required to access this database in
* 'mode', but we don't understand it. */
if (! *incompat_out)
*incompat_out = talloc_strdup (ctx, "");
*incompat_out = talloc_asprintf_append_buffer (
*incompat_out, "%s%.*s", **incompat_out ? ", " : "",
namelen, features);
}
}
}
return res;
}
static char *
_print_features (const void *ctx, unsigned int features)
{
unsigned int i;
char *res = talloc_strdup (ctx, "");
for (i = 0; i < ARRAY_SIZE (feature_names); ++i)
if (features & feature_names[i].value)
res = talloc_asprintf_append_buffer (
res, "%s\t%s\n", feature_names[i].name, feature_names[i].flags);
return res;
}
notmuch_status_t
notmuch_database_open (const char *path,
notmuch_database_mode_t mode,
notmuch_database_t **database)
{
char *status_string = NULL;
notmuch_status_t status;
status = notmuch_database_open_verbose (path, mode, database,
&status_string);
if (status_string) {
fputs (status_string, stderr);
free (status_string);
}
return status;
}
notmuch_status_t
notmuch_database_open_verbose (const char *path,
notmuch_database_mode_t mode,
notmuch_database_t **database,
char **status_string)
{
notmuch_status_t status = NOTMUCH_STATUS_SUCCESS;
void *local = talloc_new (NULL);
notmuch_database_t *notmuch = NULL;
char *notmuch_path, *xapian_path, *incompat_features;
char *message = NULL;
struct stat st;
int err;
unsigned int i, version;
static int initialized = 0;
if (path == NULL) {
message = strdup ("Error: Cannot open a database for a NULL path.\n");
status = NOTMUCH_STATUS_NULL_POINTER;
goto DONE;
}
if (path[0] != '/') {
message = strdup ("Error: Database path must be absolute.\n");
status = NOTMUCH_STATUS_PATH_ERROR;
goto DONE;
}
if (! (notmuch_path = talloc_asprintf (local, "%s/%s", path, ".notmuch"))) {
message = strdup ("Out of memory\n");
status = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
err = stat (notmuch_path, &st);
if (err) {
IGNORE_RESULT (asprintf (&message, "Error opening database at %s: %s\n",
notmuch_path, strerror (errno)));
status = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
if (! (xapian_path = talloc_asprintf (local, "%s/%s", notmuch_path, "xapian"))) {
message = strdup ("Out of memory\n");
status = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
/* Initialize the GLib type system and threads */
#if !GLIB_CHECK_VERSION(2, 35, 1)
g_type_init ();
#endif
/* Initialize gmime */
if (! initialized) {
g_mime_init (GMIME_ENABLE_RFC2047_WORKAROUNDS);
initialized = 1;
}
notmuch = talloc_zero (NULL, notmuch_database_t);
notmuch->exception_reported = false;
notmuch->status_string = NULL;
notmuch->path = talloc_strdup (notmuch, path);
strip_trailing(notmuch->path, '/');
notmuch->mode = mode;
notmuch->atomic_nesting = 0;
notmuch->view = 1;
try {
string last_thread_id;
string last_mod;
if (mode == NOTMUCH_DATABASE_MODE_READ_WRITE) {
notmuch->xapian_db = new Xapian::WritableDatabase (xapian_path,
DB_ACTION);
} else {
notmuch->xapian_db = new Xapian::Database (xapian_path);
}
/* Check version. As of database version 3, we represent
* changes in terms of features, so assume a version bump
* means a dramatically incompatible change. */
version = notmuch_database_get_version (notmuch);
if (version > NOTMUCH_DATABASE_VERSION) {
IGNORE_RESULT (asprintf (&message,
"Error: Notmuch database at %s\n"
" has a newer database format version (%u) than supported by this\n"
" version of notmuch (%u).\n",
notmuch_path, version, NOTMUCH_DATABASE_VERSION));
notmuch->mode = NOTMUCH_DATABASE_MODE_READ_ONLY;
notmuch_database_destroy (notmuch);
notmuch = NULL;
status = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
/* Check features. */
incompat_features = NULL;
notmuch->features = _parse_features (
local, notmuch->xapian_db->get_metadata ("features").c_str (),
version, mode == NOTMUCH_DATABASE_MODE_READ_WRITE ? 'w' : 'r',
&incompat_features);
if (incompat_features) {
IGNORE_RESULT (asprintf (&message,
"Error: Notmuch database at %s\n"
" requires features (%s)\n"
" not supported by this version of notmuch.\n",
notmuch_path, incompat_features));
notmuch->mode = NOTMUCH_DATABASE_MODE_READ_ONLY;
notmuch_database_destroy (notmuch);
notmuch = NULL;
status = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
notmuch->last_doc_id = notmuch->xapian_db->get_lastdocid ();
last_thread_id = notmuch->xapian_db->get_metadata ("last_thread_id");
if (last_thread_id.empty ()) {
notmuch->last_thread_id = 0;
} else {
const char *str;
char *end;
str = last_thread_id.c_str ();
notmuch->last_thread_id = strtoull (str, &end, 16);
if (*end != '\0')
INTERNAL_ERROR ("Malformed database last_thread_id: %s", str);
}
/* Get current highest revision number. */
last_mod = notmuch->xapian_db->get_value_upper_bound (
NOTMUCH_VALUE_LAST_MOD);
if (last_mod.empty ())
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;
notmuch->term_gen->set_stemmer (Xapian::Stem ("english"));
notmuch->value_range_processor = new Xapian::NumberValueRangeProcessor (NOTMUCH_VALUE_TIMESTAMP);
notmuch->date_range_processor = new ParseTimeValueRangeProcessor (NOTMUCH_VALUE_TIMESTAMP);
notmuch->last_mod_range_processor = new Xapian::NumberValueRangeProcessor (NOTMUCH_VALUE_LAST_MOD, "lastmod:");
notmuch->query_parser->set_default_op (Xapian::Query::OP_AND);
notmuch->query_parser->set_database (*notmuch->xapian_db);
notmuch->query_parser->set_stemmer (Xapian::Stem ("english"));
notmuch->query_parser->set_stemming_strategy (Xapian::QueryParser::STEM_SOME);
notmuch->query_parser->add_valuerangeprocessor (notmuch->value_range_processor);
notmuch->query_parser->add_valuerangeprocessor (notmuch->date_range_processor);
notmuch->query_parser->add_valuerangeprocessor (notmuch->last_mod_range_processor);
for (i = 0; i < ARRAY_SIZE (prefix_table); i++) {
const prefix_t *prefix = &prefix_table[i];
if (prefix->flags & NOTMUCH_FIELD_EXTERNAL) {
_setup_query_field (prefix, notmuch);
}
}
} catch (const Xapian::Error &error) {
IGNORE_RESULT (asprintf (&message, "A Xapian exception occurred opening database: %s\n",
error.get_msg().c_str()));
notmuch_database_destroy (notmuch);
notmuch = NULL;
status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
}
DONE:
talloc_free (local);
if (message) {
if (status_string)
*status_string = message;
else
free (message);
}
if (database)
*database = notmuch;
else
talloc_free (notmuch);
return status;
}
notmuch_status_t
notmuch_database_close (notmuch_database_t *notmuch)
{
notmuch_status_t status = NOTMUCH_STATUS_SUCCESS;
/* Many Xapian objects (and thus notmuch objects) hold references to
* the database, so merely deleting the database may not suffice to
* close it. Thus, we explicitly close it here. */
if (notmuch->xapian_db != NULL) {
try {
/* If there's an outstanding transaction, it's unclear if
* closing the Xapian database commits everything up to
* that transaction, or may discard committed (but
* unflushed) transactions. To be certain, explicitly
* cancel any outstanding transaction before closing. */
if (notmuch->mode == NOTMUCH_DATABASE_MODE_READ_WRITE &&
notmuch->atomic_nesting)
(static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db))
->cancel_transaction ();
/* Close the database. This implicitly flushes
* outstanding changes. */
notmuch->xapian_db->close();
} catch (const Xapian::Error &error) {
status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
if (! notmuch->exception_reported) {
_notmuch_database_log (notmuch, "Error: A Xapian exception occurred closing database: %s\n",
error.get_msg().c_str());
}
}
}
delete notmuch->term_gen;
notmuch->term_gen = NULL;
delete notmuch->query_parser;
notmuch->query_parser = NULL;
delete notmuch->xapian_db;
notmuch->xapian_db = NULL;
delete notmuch->value_range_processor;
notmuch->value_range_processor = NULL;
delete notmuch->date_range_processor;
notmuch->date_range_processor = NULL;
delete notmuch->last_mod_range_processor;
notmuch->last_mod_range_processor = NULL;
return status;
}
notmuch_status_t
_notmuch_database_reopen (notmuch_database_t *notmuch)
{
if (notmuch->mode != NOTMUCH_DATABASE_MODE_READ_ONLY)
return NOTMUCH_STATUS_UNSUPPORTED_OPERATION;
try {
notmuch->xapian_db->reopen ();
} catch (const Xapian::Error &error) {
if (! notmuch->exception_reported) {
_notmuch_database_log (notmuch, "Error: A Xapian exception reopening database: %s\n",
error.get_msg ().c_str ());
notmuch->exception_reported = true;
}
return NOTMUCH_STATUS_XAPIAN_EXCEPTION;
}
notmuch->view++;
return NOTMUCH_STATUS_SUCCESS;
}
static int
unlink_cb (const char *path,
unused (const struct stat *sb),
unused (int type),
unused (struct FTW *ftw))
{
return remove (path);
}
static int
rmtree (const char *path)
{
return nftw (path, unlink_cb, 64, FTW_DEPTH | FTW_PHYS);
}
class NotmuchCompactor : public Xapian::Compactor
{
notmuch_compact_status_cb_t status_cb;
void *status_closure;
public:
NotmuchCompactor(notmuch_compact_status_cb_t cb, void *closure) :
status_cb (cb), status_closure (closure) { }
virtual void
set_status (const std::string &table, const std::string &status)
{
char *msg;
if (status_cb == NULL)
return;
if (status.length () == 0)
msg = talloc_asprintf (NULL, "compacting table %s", table.c_str());
else
msg = talloc_asprintf (NULL, " %s", status.c_str());
if (msg == NULL) {
return;
}
status_cb (msg, status_closure);
talloc_free (msg);
}
};
/* Compacts the given database, optionally saving the original database
* in backup_path. Additionally, a callback function can be provided to
* give the user feedback on the progress of the (likely long-lived)
* compaction process.
*
* The backup path must point to a directory on the same volume as the
* original database. Passing a NULL backup_path will result in the
* uncompacted database being deleted after compaction has finished.
* Note that the database write lock will be held during the
* compaction process to protect data integrity.
*/
notmuch_status_t
notmuch_database_compact (const char *path,
const char *backup_path,
notmuch_compact_status_cb_t status_cb,
void *closure)
{
void *local;
char *notmuch_path, *xapian_path, *compact_xapian_path;
notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
notmuch_database_t *notmuch = NULL;
struct stat statbuf;
bool keep_backup;
char *message = NULL;
local = talloc_new (NULL);
if (! local)
return NOTMUCH_STATUS_OUT_OF_MEMORY;
ret = notmuch_database_open_verbose (path,
NOTMUCH_DATABASE_MODE_READ_WRITE,
&notmuch,
&message);
if (ret) {
if (status_cb) status_cb (message, closure);
goto DONE;
}
if (! (notmuch_path = talloc_asprintf (local, "%s/%s", path, ".notmuch"))) {
ret = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
if (! (xapian_path = talloc_asprintf (local, "%s/%s", notmuch_path, "xapian"))) {
ret = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
if (! (compact_xapian_path = talloc_asprintf (local, "%s.compact", xapian_path))) {
ret = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
if (backup_path == NULL) {
if (! (backup_path = talloc_asprintf (local, "%s.old", xapian_path))) {
ret = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
keep_backup = false;
}
else {
keep_backup = true;
}
if (stat (backup_path, &statbuf) != -1) {
_notmuch_database_log (notmuch, "Path already exists: %s\n", backup_path);
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
if (errno != ENOENT) {
_notmuch_database_log (notmuch, "Unknown error while stat()ing path: %s\n",
strerror (errno));
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
/* Unconditionally attempt to remove old work-in-progress database (if
* any). This is "protected" by database lock. If this fails due to write
* errors (etc), the following code will fail and provide error message.
*/
(void) rmtree (compact_xapian_path);
try {
NotmuchCompactor compactor (status_cb, closure);
compactor.set_renumber (false);
compactor.add_source (xapian_path);
compactor.set_destdir (compact_xapian_path);
compactor.compact ();
} catch (const Xapian::Error &error) {
_notmuch_database_log (notmuch, "Error while compacting: %s\n", error.get_msg().c_str());
ret = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
goto DONE;
}
if (rename (xapian_path, backup_path)) {
_notmuch_database_log (notmuch, "Error moving %s to %s: %s\n",
xapian_path, backup_path, strerror (errno));
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
if (rename (compact_xapian_path, xapian_path)) {
_notmuch_database_log (notmuch, "Error moving %s to %s: %s\n",
compact_xapian_path, xapian_path, strerror (errno));
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
if (! keep_backup) {
if (rmtree (backup_path)) {
_notmuch_database_log (notmuch, "Error removing old database %s: %s\n",
backup_path, strerror (errno));
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
}
DONE:
if (notmuch) {
notmuch_status_t ret2;
const char *str = notmuch_database_status_string (notmuch);
if (status_cb && str)
status_cb (str, closure);
ret2 = notmuch_database_destroy (notmuch);
/* don't clobber previous error status */
if (ret == NOTMUCH_STATUS_SUCCESS && ret2 != NOTMUCH_STATUS_SUCCESS)
ret = ret2;
}
talloc_free (local);
return ret;
}
notmuch_status_t
notmuch_database_destroy (notmuch_database_t *notmuch)
{
notmuch_status_t status;
status = notmuch_database_close (notmuch);
talloc_free (notmuch);
return status;
}
const char *
notmuch_database_get_path (notmuch_database_t *notmuch)
{
return notmuch->path;
}
unsigned int
notmuch_database_get_version (notmuch_database_t *notmuch)
{
unsigned int version;
string version_string;
const char *str;
char *end;
version_string = notmuch->xapian_db->get_metadata ("version");
if (version_string.empty ())
return 0;
str = version_string.c_str ();
if (str == NULL || *str == '\0')
return 0;
version = strtoul (str, &end, 10);
if (*end != '\0')
INTERNAL_ERROR ("Malformed database version: %s", str);
return version;
}
notmuch_bool_t
notmuch_database_needs_upgrade (notmuch_database_t *notmuch)
{
return notmuch->mode == NOTMUCH_DATABASE_MODE_READ_WRITE &&
((NOTMUCH_FEATURES_CURRENT & ~notmuch->features) ||
(notmuch_database_get_version (notmuch) < NOTMUCH_DATABASE_VERSION));
}
static volatile sig_atomic_t do_progress_notify = 0;
static void
handle_sigalrm (unused (int signal))
{
do_progress_notify = 1;
}
/* Upgrade the current database.
*
* After opening a database in read-write mode, the client should
* check if an upgrade is needed (notmuch_database_needs_upgrade) and
* if so, upgrade with this function before making any modifications.
*
* The optional progress_notify callback can be used by the caller to
* provide progress indication to the user. If non-NULL it will be
* called periodically with 'count' as the number of messages upgraded
* so far and 'total' the overall number of messages that will be
* converted.
*/
notmuch_status_t
notmuch_database_upgrade (notmuch_database_t *notmuch,
void (*progress_notify) (void *closure,
double progress),
void *closure)
{
void *local = talloc_new (NULL);
Xapian::TermIterator t, t_end;
Xapian::WritableDatabase *db;
struct sigaction action;
struct itimerval timerval;
bool timer_is_active = false;
enum _notmuch_features target_features, new_features;
notmuch_status_t status;
notmuch_private_status_t private_status;
notmuch_query_t *query = NULL;
unsigned int count = 0, total = 0;
status = _notmuch_database_ensure_writable (notmuch);
if (status)
return status;
db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
target_features = notmuch->features | NOTMUCH_FEATURES_CURRENT;
new_features = NOTMUCH_FEATURES_CURRENT & ~notmuch->features;
if (! notmuch_database_needs_upgrade (notmuch))
return NOTMUCH_STATUS_SUCCESS;
if (progress_notify) {
/* Set up our handler for SIGALRM */
memset (&action, 0, sizeof (struct sigaction));
action.sa_handler = handle_sigalrm;
sigemptyset (&action.sa_mask);
action.sa_flags = SA_RESTART;
sigaction (SIGALRM, &action, NULL);
/* Then start a timer to send SIGALRM once per second. */
timerval.it_interval.tv_sec = 1;
timerval.it_interval.tv_usec = 0;
timerval.it_value.tv_sec = 1;
timerval.it_value.tv_usec = 0;
setitimer (ITIMER_REAL, &timerval, NULL);
timer_is_active = true;
}
/* Figure out how much total work we need to do. */
if (new_features &
(NOTMUCH_FEATURE_FILE_TERMS | NOTMUCH_FEATURE_BOOL_FOLDER |
NOTMUCH_FEATURE_LAST_MOD)) {
query = notmuch_query_create (notmuch, "");
unsigned msg_count;
status = notmuch_query_count_messages (query, &msg_count);
if (status)
goto DONE;
total += msg_count;
notmuch_query_destroy (query);
query = NULL;
}
if (new_features & NOTMUCH_FEATURE_DIRECTORY_DOCS) {
t_end = db->allterms_end ("XTIMESTAMP");
for (t = db->allterms_begin ("XTIMESTAMP"); t != t_end; t++)
++total;
}
if (new_features & NOTMUCH_FEATURE_GHOSTS) {
/* The ghost message upgrade converts all thread_id_*
* metadata values into ghost message documents. */
t_end = db->metadata_keys_end ("thread_id_");
for (t = db->metadata_keys_begin ("thread_id_"); t != t_end; ++t)
++total;
}
/* Perform the upgrade in a transaction. */
db->begin_transaction (true);
/* Set the target features so we write out changes in the desired
* format. */
notmuch->features = target_features;
/* Perform per-message upgrades. */
if (new_features &
(NOTMUCH_FEATURE_FILE_TERMS | NOTMUCH_FEATURE_BOOL_FOLDER |
NOTMUCH_FEATURE_LAST_MOD)) {
notmuch_messages_t *messages;
notmuch_message_t *message;
char *filename;
query = notmuch_query_create (notmuch, "");
status = notmuch_query_search_messages (query, &messages);
if (status)
goto DONE;
for (;
notmuch_messages_valid (messages);
notmuch_messages_move_to_next (messages))
{
if (do_progress_notify) {
progress_notify (closure, (double) count / total);
do_progress_notify = 0;
}
message = notmuch_messages_get (messages);
/* Before version 1, each message document had its
* filename in the data field. Copy that into the new
* format by calling notmuch_message_add_filename.
*/
if (new_features & NOTMUCH_FEATURE_FILE_TERMS) {
filename = _notmuch_message_talloc_copy_data (message);
if (filename && *filename != '\0') {
_notmuch_message_add_filename (message, filename);
_notmuch_message_clear_data (message);
}
talloc_free (filename);
}
/* Prior to version 2, the "folder:" prefix was
* probabilistic and stemmed. Change it to the current
* boolean prefix. Add "path:" prefixes while at it.
*/
if (new_features & NOTMUCH_FEATURE_BOOL_FOLDER)
_notmuch_message_upgrade_folder (message);
/* Prior to NOTMUCH_FEATURE_LAST_MOD, messages did not
* track modification revisions. Give all messages the
* next available revision; since we just started tracking
* revisions for this database, that will be 1.
*/
if (new_features & NOTMUCH_FEATURE_LAST_MOD)
_notmuch_message_upgrade_last_mod (message);
_notmuch_message_sync (message);
notmuch_message_destroy (message);
count++;
}
notmuch_query_destroy (query);
query = NULL;
}
/* Perform per-directory upgrades. */
/* Before version 1 we stored directory timestamps in
* XTIMESTAMP documents instead of the current XDIRECTORY
* documents. So copy those as well. */
if (new_features & NOTMUCH_FEATURE_DIRECTORY_DOCS) {
t_end = notmuch->xapian_db->allterms_end ("XTIMESTAMP");
for (t = notmuch->xapian_db->allterms_begin ("XTIMESTAMP");
t != t_end;
t++)
{
Xapian::PostingIterator p, p_end;
std::string term = *t;
p_end = notmuch->xapian_db->postlist_end (term);
for (p = notmuch->xapian_db->postlist_begin (term);
p != p_end;
p++)
{
Xapian::Document document;
time_t mtime;
notmuch_directory_t *directory;
if (do_progress_notify) {
progress_notify (closure, (double) count / total);
do_progress_notify = 0;
}
document = find_document_for_doc_id (notmuch, *p);
mtime = Xapian::sortable_unserialise (
document.get_value (NOTMUCH_VALUE_TIMESTAMP));
directory = _notmuch_directory_create (notmuch, term.c_str() + 10,
NOTMUCH_FIND_CREATE, &status);
notmuch_directory_set_mtime (directory, mtime);
notmuch_directory_destroy (directory);
db->delete_document (*p);
}
++count;
}
}
/* Perform metadata upgrades. */
/* Prior to NOTMUCH_FEATURE_GHOSTS, thread IDs for missing
* messages were stored as database metadata. Change these to
* ghost messages.
*/
if (new_features & NOTMUCH_FEATURE_GHOSTS) {
notmuch_message_t *message;
std::string message_id, thread_id;
t_end = db->metadata_keys_end (NOTMUCH_METADATA_THREAD_ID_PREFIX);
for (t = db->metadata_keys_begin (NOTMUCH_METADATA_THREAD_ID_PREFIX);
t != t_end; ++t) {
if (do_progress_notify) {
progress_notify (closure, (double) count / total);
do_progress_notify = 0;
}
message_id = (*t).substr (
strlen (NOTMUCH_METADATA_THREAD_ID_PREFIX));
thread_id = db->get_metadata (*t);
/* Create ghost message */
message = _notmuch_message_create_for_message_id (
notmuch, message_id.c_str (), &private_status);
if (private_status == NOTMUCH_PRIVATE_STATUS_SUCCESS) {
/* Document already exists; ignore the stored thread ID */
} else if (private_status ==
NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND) {
private_status = _notmuch_message_initialize_ghost (
message, thread_id.c_str ());
if (! private_status)
_notmuch_message_sync (message);
}
if (private_status) {
_notmuch_database_log (notmuch,
"Upgrade failed while creating ghost messages.\n");
status = COERCE_STATUS (private_status, "Unexpected status from _notmuch_message_initialize_ghost");
goto DONE;
}
/* Clear saved metadata thread ID */
db->set_metadata (*t, "");
++count;
}
}
status = NOTMUCH_STATUS_SUCCESS;
db->set_metadata ("features", _print_features (local, notmuch->features));
db->set_metadata ("version", STRINGIFY (NOTMUCH_DATABASE_VERSION));
DONE:
if (status == NOTMUCH_STATUS_SUCCESS)
db->commit_transaction ();
else
db->cancel_transaction ();
if (timer_is_active) {
/* Now stop the timer. */
timerval.it_interval.tv_sec = 0;
timerval.it_interval.tv_usec = 0;
timerval.it_value.tv_sec = 0;
timerval.it_value.tv_usec = 0;
setitimer (ITIMER_REAL, &timerval, NULL);
/* And disable the signal handler. */
action.sa_handler = SIG_IGN;
sigaction (SIGALRM, &action, NULL);
}
if (query)
notmuch_query_destroy (query);
talloc_free (local);
return status;
}
notmuch_status_t
notmuch_database_begin_atomic (notmuch_database_t *notmuch)
{
if (notmuch->mode == NOTMUCH_DATABASE_MODE_READ_ONLY ||
notmuch->atomic_nesting > 0)
goto DONE;
if (notmuch_database_needs_upgrade (notmuch))
return NOTMUCH_STATUS_UPGRADE_REQUIRED;
try {
(static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db))->begin_transaction (false);
} catch (const Xapian::Error &error) {
_notmuch_database_log (notmuch, "A Xapian exception occurred beginning transaction: %s.\n",
error.get_msg().c_str());
notmuch->exception_reported = true;
return NOTMUCH_STATUS_XAPIAN_EXCEPTION;
}
DONE:
notmuch->atomic_nesting++;
return NOTMUCH_STATUS_SUCCESS;
}
notmuch_status_t
notmuch_database_end_atomic (notmuch_database_t *notmuch)
{
Xapian::WritableDatabase *db;
if (notmuch->atomic_nesting == 0)
return NOTMUCH_STATUS_UNBALANCED_ATOMIC;
if (notmuch->mode == NOTMUCH_DATABASE_MODE_READ_ONLY ||
notmuch->atomic_nesting > 1)
goto DONE;
db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
try {
db->commit_transaction ();
/* This is a hack for testing. Xapian never flushes on a
* non-flushed commit, even if the flush threshold is 1.
* However, we rely on flushing to test atomicity. */
const char *thresh = getenv ("XAPIAN_FLUSH_THRESHOLD");
if (thresh && atoi (thresh) == 1)
db->commit ();
} catch (const Xapian::Error &error) {
_notmuch_database_log (notmuch, "A Xapian exception occurred committing transaction: %s.\n",
error.get_msg().c_str());
notmuch->exception_reported = true;
return NOTMUCH_STATUS_XAPIAN_EXCEPTION;
}
if (notmuch->atomic_dirty) {
++notmuch->revision;
notmuch->atomic_dirty = false;
}
DONE:
notmuch->atomic_nesting--;
return NOTMUCH_STATUS_SUCCESS;
}
unsigned long
notmuch_database_get_revision (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.
*
* Note: This function may return the original value of 'path'. If it
* does not, then the caller is responsible to free() the returned
* value.
*/
const char *
_notmuch_database_get_directory_db_path (const char *path)
{
int term_len = strlen (_find_prefix ("directory")) + strlen (path);
if (term_len > NOTMUCH_TERM_MAX)
return _notmuch_sha1_of_string (path);
else
return path;
}
/* Given a path, split it into two parts: the directory part is all
* components except for the last, and the basename is that last
* component. Getting the return-value for either part is optional
* (the caller can pass NULL).
*
* The original 'path' can represent either a regular file or a
* directory---the splitting will be carried out in the same way in
* either case. Trailing slashes on 'path' will be ignored, and any
* cases of multiple '/' characters appearing in series will be
* treated as a single '/'.
*
* Allocation (if any) will have 'ctx' as the talloc owner. But
* pointers will be returned within the original path string whenever
* possible.
*
* Note: If 'path' is non-empty and contains no non-trailing slash,
* (that is, consists of a filename with no parent directory), then
* the directory returned will be an empty string. However, if 'path'
* is an empty string, then both directory and basename will be
* returned as NULL.
*/
notmuch_status_t
_notmuch_database_split_path (void *ctx,
const char *path,
const char **directory,
const char **basename)
{
const char *slash;
if (path == NULL || *path == '\0') {
if (directory)
*directory = NULL;
if (basename)
*basename = NULL;
return NOTMUCH_STATUS_SUCCESS;
}
/* Find the last slash (not counting a trailing slash), if any. */
slash = path + strlen (path) - 1;
/* First, skip trailing slashes. */
while (slash != path && *slash == '/')
--slash;
/* Then, find a slash. */
while (slash != path && *slash != '/') {
if (basename)
*basename = slash;
--slash;
}
/* Finally, skip multiple slashes. */
while (slash != path && *(slash - 1) == '/')
--slash;
if (slash == path) {
if (directory)
*directory = talloc_strdup (ctx, "");
if (basename)
*basename = path;
} else {
if (directory)
*directory = talloc_strndup (ctx, path, slash - path);
}
return NOTMUCH_STATUS_SUCCESS;
}
/* Find the document ID of the specified directory.
*
* If (flags & NOTMUCH_FIND_CREATE), a new directory document will be
* created if one does not exist for 'path'. Otherwise, if the
* directory document does not exist, this sets *directory_id to
* ((unsigned int)-1) and returns NOTMUCH_STATUS_SUCCESS.
*/
notmuch_status_t
_notmuch_database_find_directory_id (notmuch_database_t *notmuch,
const char *path,
notmuch_find_flags_t flags,
unsigned int *directory_id)
{
notmuch_directory_t *directory;
notmuch_status_t status;
if (path == NULL) {
*directory_id = 0;
return NOTMUCH_STATUS_SUCCESS;
}
directory = _notmuch_directory_create (notmuch, path, flags, &status);
if (status || !directory) {
*directory_id = -1;
return status;
}
*directory_id = _notmuch_directory_get_document_id (directory);
notmuch_directory_destroy (directory);
return NOTMUCH_STATUS_SUCCESS;
}
const char *
_notmuch_database_get_directory_path (void *ctx,
notmuch_database_t *notmuch,
unsigned int doc_id)
{
Xapian::Document document;
document = find_document_for_doc_id (notmuch, doc_id);
return talloc_strdup (ctx, document.get_data ().c_str ());
}
/* Given a legal 'filename' for the database, (either relative to
* database path or absolute with initial components identical to
* database path), return a new string (with 'ctx' as the talloc
* owner) suitable for use as a direntry term value.
*
* If (flags & NOTMUCH_FIND_CREATE), the necessary directory documents
* will be created in the database as needed. Otherwise, if the
* necessary directory documents do not exist, this sets
* *direntry to NULL and returns NOTMUCH_STATUS_SUCCESS.
*/
notmuch_status_t
_notmuch_database_filename_to_direntry (void *ctx,
notmuch_database_t *notmuch,
const char *filename,
notmuch_find_flags_t flags,
char **direntry)
{
const char *relative, *directory, *basename;
Xapian::docid directory_id;
notmuch_status_t status;
relative = _notmuch_database_relative_path (notmuch, filename);
status = _notmuch_database_split_path (ctx, relative,
&directory, &basename);
if (status)
return status;
status = _notmuch_database_find_directory_id (notmuch, directory, flags,
&directory_id);
if (status || directory_id == (unsigned int)-1) {
*direntry = NULL;
return status;
}
*direntry = talloc_asprintf (ctx, "%u:%s", directory_id, basename);
return NOTMUCH_STATUS_SUCCESS;
}
/* Given a legal 'path' for the database, return the relative path.
*
* The return value will be a pointer to the original path contents,
* and will be either the original string (if 'path' was relative) or
* a portion of the string (if path was absolute and begins with the
* database path).
*/
const char *
_notmuch_database_relative_path (notmuch_database_t *notmuch,
const char *path)
{
const char *db_path, *relative;
unsigned int db_path_len;
db_path = notmuch_database_get_path (notmuch);
db_path_len = strlen (db_path);
relative = path;
if (*relative == '/') {
while (*relative == '/' && *(relative+1) == '/')
relative++;
if (strncmp (relative, db_path, db_path_len) == 0)
{
relative += db_path_len;
while (*relative == '/')
relative++;
}
}
return relative;
}
notmuch_status_t
notmuch_database_get_directory (notmuch_database_t *notmuch,
const char *path,
notmuch_directory_t **directory)
{
notmuch_status_t status;
if (directory == NULL)
return NOTMUCH_STATUS_NULL_POINTER;
*directory = NULL;
try {
*directory = _notmuch_directory_create (notmuch, path,
NOTMUCH_FIND_LOOKUP, &status);
} catch (const Xapian::Error &error) {
_notmuch_database_log (notmuch, "A Xapian exception occurred getting directory: %s.\n",
error.get_msg().c_str());
notmuch->exception_reported = true;
status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
}
return status;
}
/* Allocate a document ID that satisfies the following criteria:
*
* 1. The ID does not exist for any document in the Xapian database
*
* 2. The ID was not previously returned from this function
*
* 3. The ID is the smallest integer satisfying (1) and (2)
*
* This function will trigger an internal error if these constraints
* cannot all be satisfied, (that is, the pool of available document
* IDs has been exhausted).
*/
unsigned int
_notmuch_database_generate_doc_id (notmuch_database_t *notmuch)
{
assert (notmuch->last_doc_id >= notmuch->xapian_db->get_lastdocid ());
notmuch->last_doc_id++;
if (notmuch->last_doc_id == 0)
INTERNAL_ERROR ("Xapian document IDs are exhausted.\n");
return notmuch->last_doc_id;
}
notmuch_status_t
notmuch_database_remove_message (notmuch_database_t *notmuch,
const char *filename)
{
notmuch_status_t status;
notmuch_message_t *message;
status = notmuch_database_find_message_by_filename (notmuch, filename,
&message);
if (status == NOTMUCH_STATUS_SUCCESS && message) {
status = _notmuch_message_remove_filename (message, filename);
if (status == NOTMUCH_STATUS_SUCCESS)
_notmuch_message_delete (message);
else if (status == NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID)
_notmuch_message_sync (message);
notmuch_message_destroy (message);
}
return status;
}
notmuch_status_t
notmuch_database_find_message_by_filename (notmuch_database_t *notmuch,
const char *filename,
notmuch_message_t **message_ret)
{
void *local;
const char *prefix = _find_prefix ("file-direntry");
char *direntry, *term;
Xapian::PostingIterator i, end;
notmuch_status_t status;
if (message_ret == NULL)
return NOTMUCH_STATUS_NULL_POINTER;
if (! (notmuch->features & NOTMUCH_FEATURE_FILE_TERMS))
return NOTMUCH_STATUS_UPGRADE_REQUIRED;
/* return NULL on any failure */
*message_ret = NULL;
local = talloc_new (notmuch);
try {
status = _notmuch_database_filename_to_direntry (
local, notmuch, filename, NOTMUCH_FIND_LOOKUP, &direntry);
if (status || !direntry)
goto DONE;
term = talloc_asprintf (local, "%s%s", prefix, direntry);
find_doc_ids_for_term (notmuch, term, &i, &end);
if (i != end) {
notmuch_private_status_t private_status;
*message_ret = _notmuch_message_create (notmuch, notmuch, *i,
&private_status);
if (*message_ret == NULL)
status = NOTMUCH_STATUS_OUT_OF_MEMORY;
}
} catch (const Xapian::Error &error) {
_notmuch_database_log (notmuch, "Error: A Xapian exception occurred finding message by filename: %s\n",
error.get_msg().c_str());
notmuch->exception_reported = true;
status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
}
DONE:
talloc_free (local);
if (status && *message_ret) {
notmuch_message_destroy (*message_ret);
*message_ret = NULL;
}
return status;
}
notmuch_string_list_t *
_notmuch_database_get_terms_with_prefix (void *ctx, Xapian::TermIterator &i,
Xapian::TermIterator &end,
const char *prefix)
{
int prefix_len = strlen (prefix);
notmuch_string_list_t *list;
list = _notmuch_string_list_create (ctx);
if (unlikely (list == NULL))
return NULL;
for (i.skip_to (prefix); i != end; i++) {
/* Terminate loop at first term without desired prefix. */
if (strncmp ((*i).c_str (), prefix, prefix_len))
break;
_notmuch_string_list_append (list, (*i).c_str () + prefix_len);
}
return list;
}
notmuch_tags_t *
notmuch_database_get_all_tags (notmuch_database_t *db)
{
Xapian::TermIterator i, end;
notmuch_string_list_t *tags;
try {
i = db->xapian_db->allterms_begin();
end = db->xapian_db->allterms_end();
tags = _notmuch_database_get_terms_with_prefix (db, i, end,
_find_prefix ("tag"));
_notmuch_string_list_sort (tags);
return _notmuch_tags_create (db, tags);
} catch (const Xapian::Error &error) {
_notmuch_database_log (db, "A Xapian exception occurred getting tags: %s.\n",
error.get_msg().c_str());
db->exception_reported = true;
return NULL;
}
}
const char *
notmuch_database_status_string (const notmuch_database_t *notmuch)
{
return notmuch->status_string;
}
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