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notmuch/lib/database.cc
Austin Clements 1cdb96d3c4 lib: Add a ghost messages database feature 
This will be implemented over the next several patches.  The feature
is not yet "enabled" (this does not add it to
NOTMUCH_FEATURES_CURRENT).
2014-10-25 19:25:54 +02:00

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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 http://www.gnu.org/licenses/ .
*
* Author: Carl Worth <cworth@cworth.org>
*/
#include "database-private.h"
#include "parse-time-vrp.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;
} prefix_t;
#define NOTMUCH_DATABASE_VERSION 3
#define STRINGIFY(s) _SUB_STRINGIFY(s)
#define _SUB_STRINGIFY(s) #s
/* Here's the current schema for our database (for NOTMUCH_DATABASE_VERSION):
*
* We currently have two different types of documents (mail 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.
*
* 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
*
* 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.
*
* 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.
*
* 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:
*
* http://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 prefix_t BOOLEAN_PREFIX_INTERNAL[] = {
{ "type", "T" },
{ "reference", "XREFERENCE" },
{ "replyto", "XREPLYTO" },
{ "directory", "XDIRECTORY" },
{ "file-direntry", "XFDIRENTRY" },
{ "directory-direntry", "XDDIRENTRY" },
};
static prefix_t BOOLEAN_PREFIX_EXTERNAL[] = {
{ "thread", "G" },
{ "tag", "K" },
{ "is", "K" },
{ "id", "Q" },
{ "path", "P" },
/*
* Without the ":", since this is a multi-letter prefix, Xapian
* will add a colon itself if the first letter of the path is
* upper-case ASCII. Including the ":" forces there to always be a
* colon, which keeps our own logic simpler.
*/
{ "folder", "XFOLDER:" },
};
static prefix_t PROBABILISTIC_PREFIX[]= {
{ "from", "XFROM" },
{ "to", "XTO" },
{ "attachment", "XATTACHMENT" },
{ "subject", "XSUBJECT"},
};
const char *
_find_prefix (const char *name)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE (BOOLEAN_PREFIX_INTERNAL); i++) {
if (strcmp (name, BOOLEAN_PREFIX_INTERNAL[i].name) == 0)
return BOOLEAN_PREFIX_INTERNAL[i].prefix;
}
for (i = 0; i < ARRAY_SIZE (BOOLEAN_PREFIX_EXTERNAL); i++) {
if (strcmp (name, BOOLEAN_PREFIX_EXTERNAL[i].name) == 0)
return BOOLEAN_PREFIX_EXTERNAL[i].prefix;
}
for (i = 0; i < ARRAY_SIZE (PROBABILISTIC_PREFIX); i++) {
if (strcmp (name, PROBABILISTIC_PREFIX[i].name) == 0)
return PROBABILISTIC_PREFIX[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"},
};
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";
default:
case NOTMUCH_STATUS_LAST_STATUS:
return "Unknown error status value";
}
}
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);
}
static void
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;
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) {
fprintf (stderr, "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;
}
}
/* Advance 'str' past any whitespace or RFC 822 comments. A comment is
* a (potentially nested) parenthesized sequence with '\' used to
* escape any character (including parentheses).
*
* If the sequence to be skipped continues to the end of the string,
* then 'str' will be left pointing at the final terminating '\0'
* character.
*/
static void
skip_space_and_comments (const char **str)
{
const char *s;
s = *str;
while (*s && (isspace (*s) || *s == '(')) {
while (*s && isspace (*s))
s++;
if (*s == '(') {
int nesting = 1;
s++;
while (*s && nesting) {
if (*s == '(') {
nesting++;
} else if (*s == ')') {
nesting--;
} else if (*s == '\\') {
if (*(s+1))
s++;
}
s++;
}
}
}
*str = s;
}
/* Parse an RFC 822 message-id, discarding whitespace, any RFC 822
* comments, and the '<' and '>' delimiters.
*
* If not NULL, then *next will be made to point to the first character
* not parsed, (possibly pointing to the final '\0' terminator.
*
* Returns a newly talloc'ed string belonging to 'ctx'.
*
* Returns NULL if there is any error parsing the message-id. */
static char *
_parse_message_id (void *ctx, const char *message_id, const char **next)
{
const char *s, *end;
char *result;
if (message_id == NULL || *message_id == '\0')
return NULL;
s = message_id;
skip_space_and_comments (&s);
/* Skip any unstructured text as well. */
while (*s && *s != '<')
s++;
if (*s == '<') {
s++;
} else {
if (next)
*next = s;
return NULL;
}
skip_space_and_comments (&s);
end = s;
while (*end && *end != '>')
end++;
if (next) {
if (*end)
*next = end + 1;
else
*next = end;
}
if (end > s && *end == '>')
end--;
if (end <= s)
return NULL;
result = talloc_strndup (ctx, s, end - s + 1);
/* Finally, collapse any whitespace that is within the message-id
* itself. */
{
char *r;
int len;
for (r = result, len = strlen (r); *r; r++, len--)
if (*r == ' ' || *r == '\t')
memmove (r, r+1, len);
}
return result;
}
/* Parse a References header value, putting a (talloc'ed under 'ctx')
* copy of each referenced message-id into 'hash'.
*
* We explicitly avoid including any reference identical to
* 'message_id' in the result (to avoid mass confusion when a single
* message references itself cyclically---and yes, mail messages are
* not infrequent in the wild that do this---don't ask me why).
*
* Return the last reference parsed, if it is not equal to message_id.
*/
static char *
parse_references (void *ctx,
const char *message_id,
GHashTable *hash,
const char *refs)
{
char *ref, *last_ref = NULL;
if (refs == NULL || *refs == '\0')
return NULL;
while (*refs) {
ref = _parse_message_id (ctx, refs, &refs);
if (ref && strcmp (ref, message_id)) {
g_hash_table_insert (hash, ref, NULL);
last_ref = ref;
}
}
/* The return value of this function is used to add a parent
* reference to the database. We should avoid making a message
* its own parent, thus the above check.
*/
return last_ref;
}
notmuch_status_t
notmuch_database_create (const char *path, notmuch_database_t **database)
{
notmuch_status_t status = NOTMUCH_STATUS_SUCCESS;
notmuch_database_t *notmuch = NULL;
char *notmuch_path = NULL;
struct stat st;
int err;
if (path == NULL) {
fprintf (stderr, "Error: Cannot create a database for a NULL path.\n");
status = NOTMUCH_STATUS_NULL_POINTER;
goto DONE;
}
err = stat (path, &st);
if (err) {
fprintf (stderr, "Error: Cannot create database at %s: %s.\n",
path, strerror (errno));
status = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
if (! S_ISDIR (st.st_mode)) {
fprintf (stderr, "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) {
fprintf (stderr, "Error: Cannot create directory %s: %s.\n",
notmuch_path, strerror (errno));
status = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
status = notmuch_database_open (path,
NOTMUCH_DATABASE_MODE_READ_WRITE,
&notmuch);
if (status)
goto DONE;
/* Upgrade doesn't add this feature to existing databases, but new
* databases have it. */
notmuch->features |= NOTMUCH_FEATURE_FROM_SUBJECT_ID_VALUES;
status = notmuch_database_upgrade (notmuch, NULL, NULL);
if (status) {
notmuch_database_close(notmuch);
notmuch = NULL;
}
DONE:
if (notmuch_path)
talloc_free (notmuch_path);
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) {
fprintf (stderr, "Cannot write to a read-only database.\n");
return NOTMUCH_STATUS_READ_ONLY_DATABASE;
}
return NOTMUCH_STATUS_SUCCESS;
}
/* 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)
{
notmuch_status_t status = NOTMUCH_STATUS_SUCCESS;
void *local = talloc_new (NULL);
notmuch_database_t *notmuch = NULL;
char *notmuch_path, *xapian_path, *incompat_features;
struct stat st;
int err;
unsigned int i, version;
static int initialized = 0;
if (path == NULL) {
fprintf (stderr, "Error: Cannot open a database for a NULL path.\n");
status = NOTMUCH_STATUS_NULL_POINTER;
goto DONE;
}
if (! (notmuch_path = talloc_asprintf (local, "%s/%s", path, ".notmuch"))) {
fprintf (stderr, "Out of memory\n");
status = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
err = stat (notmuch_path, &st);
if (err) {
fprintf (stderr, "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"))) {
fprintf (stderr, "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->path = talloc_strdup (notmuch, path);
if (notmuch->path[strlen (notmuch->path) - 1] == '/')
notmuch->path[strlen (notmuch->path) - 1] = '\0';
notmuch->mode = mode;
notmuch->atomic_nesting = 0;
try {
string last_thread_id;
if (mode == NOTMUCH_DATABASE_MODE_READ_WRITE) {
notmuch->xapian_db = new Xapian::WritableDatabase (xapian_path,
Xapian::DB_CREATE_OR_OPEN);
} 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) {
fprintf (stderr,
"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) {
fprintf (stderr,
"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);
}
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->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);
for (i = 0; i < ARRAY_SIZE (BOOLEAN_PREFIX_EXTERNAL); i++) {
prefix_t *prefix = &BOOLEAN_PREFIX_EXTERNAL[i];
notmuch->query_parser->add_boolean_prefix (prefix->name,
prefix->prefix);
}
for (i = 0; i < ARRAY_SIZE (PROBABILISTIC_PREFIX); i++) {
prefix_t *prefix = &PROBABILISTIC_PREFIX[i];
notmuch->query_parser->add_prefix (prefix->name, prefix->prefix);
}
} catch (const Xapian::Error &error) {
fprintf (stderr, "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 (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) {
fprintf (stderr, "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;
return status;
}
#if HAVE_XAPIAN_COMPACT
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;
local = talloc_new (NULL);
if (! local)
return NOTMUCH_STATUS_OUT_OF_MEMORY;
ret = notmuch_database_open (path, NOTMUCH_DATABASE_MODE_READ_WRITE, &notmuch);
if (ret) {
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) {
fprintf (stderr, "Path already exists: %s\n", backup_path);
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
if (errno != ENOENT) {
fprintf (stderr, "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) {
fprintf (stderr, "Error while compacting: %s\n", error.get_msg().c_str());
ret = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
goto DONE;
}
if (rename (xapian_path, backup_path)) {
fprintf (stderr, "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)) {
fprintf (stderr, "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)) {
fprintf (stderr, "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;
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;
}
#else
notmuch_status_t
notmuch_database_compact (unused (const char *path),
unused (const char *backup_path),
unused (notmuch_compact_status_cb_t status_cb),
unused (void *closure))
{
fprintf (stderr, "notmuch was compiled against a xapian version lacking compaction support.\n");
return NOTMUCH_STATUS_UNSUPPORTED_OPERATION;
}
#endif
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;
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) {
/* Setup 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_query_t *query = notmuch_query_create (notmuch, "");
total += notmuch_query_count_messages (query);
notmuch_query_destroy (query);
}
if (new_features & NOTMUCH_FEATURE_DIRECTORY_DOCS) {
t_end = db->allterms_end ("XTIMESTAMP");
for (t = db->allterms_begin ("XTIMESTAMP"); 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_query_t *query = notmuch_query_create (notmuch, "");
notmuch_messages_t *messages;
notmuch_message_t *message;
char *filename;
for (messages = notmuch_query_search_messages (query);
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);
_notmuch_message_sync (message);
notmuch_message_destroy (message);
count++;
}
notmuch_query_destroy (query);
}
/* 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;
}
}
db->set_metadata ("features", _print_features (local, notmuch->features));
db->set_metadata ("version", STRINGIFY (NOTMUCH_DATABASE_VERSION));
db->commit_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);
}
talloc_free (local);
return NOTMUCH_STATUS_SUCCESS;
}
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;
try {
(static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db))->begin_transaction (false);
} catch (const Xapian::Error &error) {
fprintf (stderr, "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->flush ();
} catch (const Xapian::Error &error) {
fprintf (stderr, "A Xapian exception occurred committing 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;
}
/* 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) {
if (*slash != '/')
break;
--slash;
}
/* Then, find a slash. */
while (slash != path) {
if (*slash == '/')
break;
if (basename)
*basename = slash;
--slash;
}
/* Finally, skip multiple slashes. */
while (slash != path) {
if (*slash != '/')
break;
--slash;
}
if (slash == path) {
if (directory)
*directory = talloc_strdup (ctx, "");
if (basename)
*basename = path;
} else {
if (directory)
*directory = talloc_strndup (ctx, path, slash - path + 1);
}
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) {
fprintf (stderr, "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;
}
static const char *
_notmuch_database_generate_thread_id (notmuch_database_t *notmuch)
{
/* 16 bytes (+ terminator) for hexadecimal representation of
* a 64-bit integer. */
static char thread_id[17];
Xapian::WritableDatabase *db;
db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
notmuch->last_thread_id++;
sprintf (thread_id, "%016" PRIx64, notmuch->last_thread_id);
db->set_metadata ("last_thread_id", thread_id);
return thread_id;
}
static char *
_get_metadata_thread_id_key (void *ctx, const char *message_id)
{
if (strlen (message_id) > NOTMUCH_MESSAGE_ID_MAX)
message_id = _notmuch_message_id_compressed (ctx, message_id);
return talloc_asprintf (ctx, NOTMUCH_METADATA_THREAD_ID_PREFIX "%s",
message_id);
}
/* Find the thread ID to which the message with 'message_id' belongs.
*
* Note: 'thread_id_ret' must not be NULL!
* On success '*thread_id_ret' is set to a newly talloced string belonging to
* 'ctx'.
*
* Note: If there is no message in the database with the given
* 'message_id' then a new thread_id will be allocated for this
* message and stored in the database metadata, (where this same
* thread ID can be looked up if the message is added to the database
* later).
*/
static notmuch_status_t
_resolve_message_id_to_thread_id (notmuch_database_t *notmuch,
void *ctx,
const char *message_id,
const char **thread_id_ret)
{
notmuch_status_t status;
notmuch_message_t *message;
string thread_id_string;
char *metadata_key;
Xapian::WritableDatabase *db;
status = notmuch_database_find_message (notmuch, message_id, &message);
if (status)
return status;
if (message) {
*thread_id_ret = talloc_steal (ctx,
notmuch_message_get_thread_id (message));
notmuch_message_destroy (message);
return NOTMUCH_STATUS_SUCCESS;
}
/* Message has not been seen yet.
*
* We may have seen a reference to it already, in which case, we
* can return the thread ID stored in the metadata. Otherwise, we
* generate a new thread ID and store it there.
*/
db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
metadata_key = _get_metadata_thread_id_key (ctx, message_id);
thread_id_string = notmuch->xapian_db->get_metadata (metadata_key);
if (thread_id_string.empty()) {
*thread_id_ret = talloc_strdup (ctx,
_notmuch_database_generate_thread_id (notmuch));
db->set_metadata (metadata_key, *thread_id_ret);
} else {
*thread_id_ret = talloc_strdup (ctx, thread_id_string.c_str());
}
talloc_free (metadata_key);
return NOTMUCH_STATUS_SUCCESS;
}
static notmuch_status_t
_merge_threads (notmuch_database_t *notmuch,
const char *winner_thread_id,
const char *loser_thread_id)
{
Xapian::PostingIterator loser, loser_end;
notmuch_message_t *message = NULL;
notmuch_private_status_t private_status;
notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
find_doc_ids (notmuch, "thread", loser_thread_id, &loser, &loser_end);
for ( ; loser != loser_end; loser++) {
message = _notmuch_message_create (notmuch, notmuch,
*loser, &private_status);
if (message == NULL) {
ret = COERCE_STATUS (private_status,
"Cannot find document for doc_id from query");
goto DONE;
}
_notmuch_message_remove_term (message, "thread", loser_thread_id);
_notmuch_message_add_term (message, "thread", winner_thread_id);
_notmuch_message_sync (message);
notmuch_message_destroy (message);
message = NULL;
}
DONE:
if (message)
notmuch_message_destroy (message);
return ret;
}
static void
_my_talloc_free_for_g_hash (void *ptr)
{
talloc_free (ptr);
}
static notmuch_status_t
_notmuch_database_link_message_to_parents (notmuch_database_t *notmuch,
notmuch_message_t *message,
notmuch_message_file_t *message_file,
const char **thread_id)
{
GHashTable *parents = NULL;
const char *refs, *in_reply_to, *in_reply_to_message_id;
const char *last_ref_message_id, *this_message_id;
GList *l, *keys = NULL;
notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
parents = g_hash_table_new_full (g_str_hash, g_str_equal,
_my_talloc_free_for_g_hash, NULL);
this_message_id = notmuch_message_get_message_id (message);
refs = _notmuch_message_file_get_header (message_file, "references");
last_ref_message_id = parse_references (message,
this_message_id,
parents, refs);
in_reply_to = _notmuch_message_file_get_header (message_file, "in-reply-to");
in_reply_to_message_id = parse_references (message,
this_message_id,
parents, in_reply_to);
/* For the parent of this message, use the last message ID of the
* References header, if available. If not, fall back to the
* first message ID in the In-Reply-To header. */
if (last_ref_message_id) {
_notmuch_message_add_term (message, "replyto",
last_ref_message_id);
} else if (in_reply_to_message_id) {
_notmuch_message_add_term (message, "replyto",
in_reply_to_message_id);
}
keys = g_hash_table_get_keys (parents);
for (l = keys; l; l = l->next) {
char *parent_message_id;
const char *parent_thread_id = NULL;
parent_message_id = (char *) l->data;
_notmuch_message_add_term (message, "reference",
parent_message_id);
ret = _resolve_message_id_to_thread_id (notmuch,
message,
parent_message_id,
&parent_thread_id);
if (ret)
goto DONE;
if (*thread_id == NULL) {
*thread_id = talloc_strdup (message, parent_thread_id);
_notmuch_message_add_term (message, "thread", *thread_id);
} else if (strcmp (*thread_id, parent_thread_id)) {
ret = _merge_threads (notmuch, *thread_id, parent_thread_id);
if (ret)
goto DONE;
}
}
DONE:
if (keys)
g_list_free (keys);
if (parents)
g_hash_table_unref (parents);
return ret;
}
static notmuch_status_t
_notmuch_database_link_message_to_children (notmuch_database_t *notmuch,
notmuch_message_t *message,
const char **thread_id)
{
const char *message_id = notmuch_message_get_message_id (message);
Xapian::PostingIterator child, children_end;
notmuch_message_t *child_message = NULL;
const char *child_thread_id;
notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
notmuch_private_status_t private_status;
find_doc_ids (notmuch, "reference", message_id, &child, &children_end);
for ( ; child != children_end; child++) {
child_message = _notmuch_message_create (message, notmuch,
*child, &private_status);
if (child_message == NULL) {
ret = COERCE_STATUS (private_status,
"Cannot find document for doc_id from query");
goto DONE;
}
child_thread_id = notmuch_message_get_thread_id (child_message);
if (*thread_id == NULL) {
*thread_id = talloc_strdup (message, child_thread_id);
_notmuch_message_add_term (message, "thread", *thread_id);
} else if (strcmp (*thread_id, child_thread_id)) {
_notmuch_message_remove_term (child_message, "reference",
message_id);
_notmuch_message_sync (child_message);
ret = _merge_threads (notmuch, *thread_id, child_thread_id);
if (ret)
goto DONE;
}
notmuch_message_destroy (child_message);
child_message = NULL;
}
DONE:
if (child_message)
notmuch_message_destroy (child_message);
return ret;
}
/* Fetch and clear the stored thread_id for message, or NULL if none. */
static char *
_consume_metadata_thread_id (void *ctx, notmuch_database_t *notmuch,
notmuch_message_t *message)
{
const char *message_id;
string stored_id;
char *metadata_key;
message_id = notmuch_message_get_message_id (message);
metadata_key = _get_metadata_thread_id_key (ctx, message_id);
/* Check if we have already seen related messages to this one.
* If we have then use the thread_id that we stored at that time.
*/
stored_id = notmuch->xapian_db->get_metadata (metadata_key);
if (stored_id.empty ()) {
return NULL;
} else {
Xapian::WritableDatabase *db;
db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
/* Clear the metadata for this message ID. We don't need it
* anymore. */
db->set_metadata (metadata_key, "");
return talloc_strdup (ctx, stored_id.c_str ());
}
}
/* Given a (mostly empty) 'message' and its corresponding
* 'message_file' link it to existing threads in the database.
*
* The first check is in the metadata of the database to see if we
* have pre-allocated a thread_id in advance for this message, (which
* would have happened if a message was previously added that
* referenced this one).
*
* Second, we look at 'message_file' and its link-relevant headers
* (References and In-Reply-To) for message IDs.
*
* Finally, we look in the database for existing message that
* reference 'message'.
*
* In all cases, we assign to the current message the first thread_id
* found (through either parent or child). We will also merge any
* existing, distinct threads where this message belongs to both,
* (which is not uncommon when messages are processed out of order).
*
* Finally, if no thread ID has been found through parent or child, we
* call _notmuch_message_generate_thread_id to generate a new thread
* ID. This should only happen for new, top-level messages, (no
* References or In-Reply-To header in this message, and no previously
* added message refers to this message).
*/
static notmuch_status_t
_notmuch_database_link_message (notmuch_database_t *notmuch,
notmuch_message_t *message,
notmuch_message_file_t *message_file)
{
void *local = talloc_new (NULL);
notmuch_status_t status;
const char *thread_id;
/* Check if the message already had a thread ID */
thread_id = _consume_metadata_thread_id (local, notmuch, message);
if (thread_id)
_notmuch_message_add_term (message, "thread", thread_id);
status = _notmuch_database_link_message_to_parents (notmuch, message,
message_file,
&thread_id);
if (status)
goto DONE;
status = _notmuch_database_link_message_to_children (notmuch, message,
&thread_id);
if (status)
goto DONE;
/* If not part of any existing thread, generate a new thread ID. */
if (thread_id == NULL) {
thread_id = _notmuch_database_generate_thread_id (notmuch);
_notmuch_message_add_term (message, "thread", thread_id);
}
DONE:
talloc_free (local);
return status;
}
notmuch_status_t
notmuch_database_add_message (notmuch_database_t *notmuch,
const char *filename,
notmuch_message_t **message_ret)
{
notmuch_message_file_t *message_file;
notmuch_message_t *message = NULL;
notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS, ret2;
notmuch_private_status_t private_status;
const char *date, *header;
const char *from, *to, *subject;
char *message_id = NULL;
if (message_ret)
*message_ret = NULL;
ret = _notmuch_database_ensure_writable (notmuch);
if (ret)
return ret;
message_file = _notmuch_message_file_open (filename);
if (message_file == NULL)
return NOTMUCH_STATUS_FILE_ERROR;
/* Adding a message may change many documents. Do this all
* atomically. */
ret = notmuch_database_begin_atomic (notmuch);
if (ret)
goto DONE;
/* Parse message up front to get better error status. */
ret = _notmuch_message_file_parse (message_file);
if (ret)
goto DONE;
try {
/* Before we do any real work, (especially before doing a
* potential SHA-1 computation on the entire file's contents),
* let's make sure that what we're looking at looks like an
* actual email message.
*/
from = _notmuch_message_file_get_header (message_file, "from");
subject = _notmuch_message_file_get_header (message_file, "subject");
to = _notmuch_message_file_get_header (message_file, "to");
if ((from == NULL || *from == '\0') &&
(subject == NULL || *subject == '\0') &&
(to == NULL || *to == '\0'))
{
ret = NOTMUCH_STATUS_FILE_NOT_EMAIL;
goto DONE;
}
/* Now that we're sure it's mail, the first order of business
* is to find a message ID (or else create one ourselves). */
header = _notmuch_message_file_get_header (message_file, "message-id");
if (header && *header != '\0') {
message_id = _parse_message_id (message_file, header, NULL);
/* So the header value isn't RFC-compliant, but it's
* better than no message-id at all. */
if (message_id == NULL)
message_id = talloc_strdup (message_file, header);
}
if (message_id == NULL ) {
/* No message-id at all, let's generate one by taking a
* hash over the file's contents. */
char *sha1 = _notmuch_sha1_of_file (filename);
/* If that failed too, something is really wrong. Give up. */
if (sha1 == NULL) {
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
message_id = talloc_asprintf (message_file,
"notmuch-sha1-%s", sha1);
free (sha1);
}
/* Now that we have a message ID, we get a message object,
* (which may or may not reference an existing document in the
* database). */
message = _notmuch_message_create_for_message_id (notmuch,
message_id,
&private_status);
talloc_free (message_id);
if (message == NULL) {
ret = COERCE_STATUS (private_status,
"Unexpected status value from _notmuch_message_create_for_message_id");
goto DONE;
}
_notmuch_message_add_filename (message, filename);
/* Is this a newly created message object? */
if (private_status == NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND) {
_notmuch_message_add_term (message, "type", "mail");
ret = _notmuch_database_link_message (notmuch, message,
message_file);
if (ret)
goto DONE;
date = _notmuch_message_file_get_header (message_file, "date");
_notmuch_message_set_header_values (message, date, from, subject);
ret = _notmuch_message_index_file (message, message_file);
if (ret)
goto DONE;
} else {
ret = NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID;
}
_notmuch_message_sync (message);
} catch (const Xapian::Error &error) {
fprintf (stderr, "A Xapian exception occurred adding message: %s.\n",
error.get_msg().c_str());
notmuch->exception_reported = TRUE;
ret = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
goto DONE;
}
DONE:
if (message) {
if ((ret == NOTMUCH_STATUS_SUCCESS ||
ret == NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID) && message_ret)
*message_ret = message;
else
notmuch_message_destroy (message);
}
if (message_file)
_notmuch_message_file_close (message_file);
ret2 = notmuch_database_end_atomic (notmuch);
if ((ret == NOTMUCH_STATUS_SUCCESS ||
ret == NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID) &&
ret2 != NOTMUCH_STATUS_SUCCESS)
ret = ret2;
return ret;
}
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) {
fprintf (stderr, "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) {
fprintf (stderr, "A Xapian exception occurred getting tags: %s.\n",
error.get_msg().c_str());
db->exception_reported = TRUE;
return NULL;
}
}
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