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notmuch/lib/database.cc
Yuri Volchkov cec4a87539 database: move striping of trailing '/' into helper function 
Stripping trailing character is not that uncommon
operation. Particularly, the next patch has to perform it as
well. Lets move it to the separate function to avoid code duplication.

Also the new function has a little improvement: if the character to
strip is repeated several times in the end of a string, function
strips them all.

Signed-off-by: Yuri Volchkov <yuri.volchkov@gmail.com>
2017-08-22 18:47:51 -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 "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 (though only one has its
* content indexed) 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 },
{ "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
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";
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;
notmuch_bool_t 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;
notmuch_bool_t 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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