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8193cc3e4c
Rewrite the contacts-cache backend in c++ Store the contacts as metadata in the xapian database, rather than in a separate file. Update the Store to deal with this.
422 lines
12 KiB
C
422 lines
12 KiB
C
/*
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** Copyright (C) 2008-2017 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
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**
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** This program is free software; you can redistribute it and/or modify it
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** under the terms of the GNU General Public License as published by the
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** Free Software Foundation; either version 3, or (at your option) any
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** later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation,
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** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**
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*/
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#ifndef __MU_STORE_H__
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#define __MU_STORE_H__
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#include <glib.h>
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#include <inttypes.h>
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#include <mu-msg.h>
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#include <mu-util.h> /* for MuError, MuError */
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#include <mu-contacts.h>
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G_BEGIN_DECLS
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struct _MuStore;
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typedef struct _MuStore MuStore;
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/* http://article.gmane.org/gmane.comp.search.xapian.general/3656 */
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#define MU_STORE_MAX_TERM_LENGTH (240)
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/**
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* create a new writable Xapian store, a place to store documents
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*
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* @param path the path to the database
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* @param ccachepath path where to cache the contacts information, or NULL
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* @param err to receive error info or NULL. err->code is MuError value
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*
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* @return a new MuStore object with ref count == 1, or NULL in case
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* of error; free with mu_store_unref
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*/
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MuStore* mu_store_new_writable (const char *xpath,
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const char *ccachepath,
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gboolean rebuild, GError **err)
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G_GNUC_MALLOC G_GNUC_WARN_UNUSED_RESULT;
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/**
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* create a new read-only Xapian store, for querying documents
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*
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* @param path the path to the database
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* @param err to receive error info or NULL. err->code is MuError value
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*
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* @return a new MuStore object with ref count == 1, or NULL in case
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* of error; free with mu_store_unref
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*/
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MuStore* mu_store_new_read_only (const char* xpath, GError **err)
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G_GNUC_MALLOC G_GNUC_WARN_UNUSED_RESULT;
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/**
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* increase the reference count for this store with 1
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*
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* @param store a valid store object
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*
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* @return the same store with increased ref count, or NULL in case of
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* error
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*/
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MuStore* mu_store_ref (MuStore *store);
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/**
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* decrease the reference count for this store with 1
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*
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* @param store a valid store object
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*
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* @return NULL
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*/
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MuStore* mu_store_unref (MuStore *store);
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/**
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* we need this when using Xapian::WritableDatabase* from C
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*/
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typedef gpointer XapianWritableDatabase;
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/**
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* get the underlying writable database object for this store; not
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* that this pointer becomes in valid after mu_store_destroy
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*
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* @param store a valid store
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*
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* @return a Xapian::WritableDatabase (you'll need to cast in C++), or
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* NULL in case of error.
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*/
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XapianWritableDatabase* mu_store_get_writable_database (MuStore *store);
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/**
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* we need this when using Xapian::WritableDatabase* from C
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*/
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typedef gpointer XapianDatabase;
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/**
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* get the underlying read-only database object for this store; not that this
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* pointer becomes in valid after mu_store_destroy
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*
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* @param store a valid store
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*
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* @return a Xapian::Database (you'll need to cast in C++), or
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* NULL in case of error.
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*/
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XapianDatabase* mu_store_get_read_only_database (MuStore *store);
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/**
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* set the Xapian batch size for this store. Normally, there's no need
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* to use this function as the default is good enough; however, if you
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* use mu in a very memory-constrained environment, you can set the
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* batchsize to e.g. 1000 at the cost of significant slow-down.
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*
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* @param store a valid store object
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* @param batchsize the new batch size; or 0 to reset to
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* the default batch size
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*/
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void mu_store_set_batch_size (MuStore *store, guint batchsize);
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/**
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* register a char** of email addresses as 'my' addresses, ie. mark
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* message that have these addresses in one of the address fields as
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* 'personal' (e.g., in mu-contacts). calling this function overrides
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* any 'my addresses' that were set before, using this function or
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* through mu_store_new_writable
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*
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* @param store a valid store object
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* @param my_addresses a char** of email addresses
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*/
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void mu_store_set_my_addresses (MuStore *store, const char **my_addresses);
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/**
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* Get the a MuContacts* ptr for this store.
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*
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* @param store a store
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*
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* @return the contacts ptr
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*/
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MuContacts* mu_store_contacts (MuStore *store);
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/**
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* get the numbers of documents in the database
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*
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* @param index a valid MuStore instance
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* @param err to receive error info or NULL. err->code is MuError value
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*
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* @return the number of documents in the database; (unsigned)-1 in
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* case of error
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*/
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unsigned mu_store_count (const MuStore *store, GError **err);
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/**
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* get a version string for the database; it's a const string, which
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* is valid as long MuStore exists and mu_store_version is not called
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* again.
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*
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* @param store a valid MuStore
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*
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* @return the version string or NULL in case of error
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*/
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const char* mu_store_version (const MuStore *store);
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/**
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* try to flush/commit all outstanding work to the database and the contacts
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* cache.
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*
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* @param store a valid xapian store
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*/
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void mu_store_flush (MuStore *store);
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#define MU_STORE_INVALID_DOCID 0
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/**
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* store an email message in the XapianStore
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*
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* @param store a valid store
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* @param msg a valid message
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* @param err receives error information, if any, or NULL
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*
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* @return the docid of the stored message, or 0
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* (MU_STORE_INVALID_DOCID) in case of error
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*/
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unsigned mu_store_add_msg (MuStore *store, MuMsg *msg, GError **err);
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/**
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* update an email message in the XapianStore
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*
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* @param store a valid store
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* @param the docid for the message
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* @param msg a valid message
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* @param err receives error information, if any, or NULL
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*
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* @return the docid of the stored message, or 0
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* (MU_STORE_INVALID_DOCID) in case of error
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*/
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unsigned mu_store_update_msg (MuStore *store, unsigned docid, MuMsg *msg,
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GError **err);
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/**
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* store an email message in the XapianStore; similar to
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* mu_store_store, but instead takes a path as parameter instead of a
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* MuMsg*
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*
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* @param store a valid store
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* @param path full filesystem path to a valid message
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* @param maildir set the maildir (e.g. "/drafts") for this message, or NULL
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* note that you cannot mu_msg_move_msg_to_maildir unless maildir is set.
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* @param err receives error information, if any, or NULL
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*
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* @return the docid of the stored message, or 0
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* (MU_STORE_INVALID_DOCID) in case of error
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*/
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unsigned mu_store_add_path (MuStore *store, const char *path,
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const char* maildir, GError **err);
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/**
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* remove a message from the database based on its path
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*
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* @param store a valid store
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* @param msgpath path of the message (note, this is only used to
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* *identify* the message; a common use of this function is to remove
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* a message from the database, for which there is no message anymore
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* in the filesystem.
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*
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* @return TRUE if it succeeded, FALSE otherwise
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*/
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gboolean mu_store_remove_path (MuStore *store, const char* msgpath);
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/**
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* does a certain message exist in the database already?
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*
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* @param store a store
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* @param path the message path
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* @param err to receive error info or NULL. err->code is MuError value
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*
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* @return TRUE if the message exists, FALSE otherwise
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*/
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gboolean mu_store_contains_message (const MuStore *store, const char* path,
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GError **err);
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/**
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* get the docid for message at path
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*
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* @param store a store
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* @param path the message path
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* @param err to receive error info or NULL. err->code is MuError value
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*
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* @return the docid if the message was found, MU_STORE_INVALID_DOCID (0) otherwise
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* */
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unsigned mu_store_get_docid_for_path (const MuStore *store, const char* path, GError **err);
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/**
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* store a timestamp for a directory
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*
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* @param store a valid store
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* @param msgpath path to a maildir
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* @param stamp a timestamp
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* @param err to receive error info or NULL. err->code is MuError value
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*
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* @return TRUE if setting the timestamp succeeded, FALSE otherwise
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*/
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gboolean mu_store_set_timestamp (MuStore *store, const char* msgpath,
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time_t stamp, GError **err);
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/**
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* get the timestamp for a directory
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*
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* @param store a valid store
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* @param msgpath path to a maildir
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* @param err to receive error info or NULL. err->code is MuError value
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*
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* @return the timestamp, or 0 in case of error
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*/
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time_t mu_store_get_timestamp (const MuStore *store, const char* msgpath,
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GError **err);
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/**
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* check whether this store is read-only
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*
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* @param store a store
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*
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* @return TRUE if the store is read-only, FALSE otherwise (and in
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* case of error)
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*/
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gboolean mu_store_is_read_only (const MuStore *store);
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/**
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* call a function for each document in the database
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*
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* @param self a valid store
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* @param func a callback function to to call for each document
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* @param user_data a user pointer passed to the callback function
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* @param err to receive error info or NULL. err->code is MuError value
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*
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* @return MU_OK if all went well, MU_STOP if the foreach was interrupted,
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* MU_ERROR in case of error
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*/
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typedef MuError (*MuStoreForeachFunc) (const char* path, gpointer user_data);
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MuError mu_store_foreach (MuStore *self, MuStoreForeachFunc func,
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void *user_data, GError **err);
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/**
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* set metadata for this MuStore
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*
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* @param store a store
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* @param key metadata key
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* @param val metadata value
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* @param err to receive error info or NULL. err->code is the MuError value
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*
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* @return TRUE if succeeded, FALSE otherwise
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*/
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gboolean mu_store_set_metadata (MuStore *store, const char *key, const char *val,
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GError **err);
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/**
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* get metadata for this MuStore
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*
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* @param store a store
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* @param key the metadata key
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* @param err to receive error info or NULL. err->code is MuError value
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*
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* @return the value of the metadata (gfree when done with it), or
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* NULL in case of error
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*/
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char* mu_store_get_metadata (const MuStore *store, const char *key, GError **err)
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G_GNUC_WARN_UNUSED_RESULT;
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/**
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" * get the version of the xapian database (ie., the version of the
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* 'schema' we are using). If this version != MU_STORE_SCHEMA_VERSION,
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* it's means we need to a full reindex.
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*
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* @param xpath path to the xapian database
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*
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* @return the version of the database as a newly allocated string
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* (free with g_free); if there is no version yet, it will return NULL
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*/
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gchar* mu_store_database_version (const gchar *xpath) G_GNUC_WARN_UNUSED_RESULT;
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/**
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* check whether the database schema's version is the same as the one
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* that the current mu uses. If they are not the same, we'll need a
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* database rebuild.
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*
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* @param store a MuStore instance
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*
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* @return TRUE if the versions are the same, FALSE otherwise.
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*/
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gboolean mu_store_versions_match (const MuStore *store);
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/**
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* clear the database, ie., remove all of the contents. This is a
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* destructive operation, but the database can be restored be doing a
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* full scan of the maildirs. Also, clear the contacts cache file
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*
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* @param store a MuStore object
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* @param err to receive error info or NULL. err->code is MuError value
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*
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* @return TRUE if the clearing succeeded, FALSE otherwise.
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*/
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gboolean mu_store_clear (MuStore *store, GError **err);
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/**
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* check if the database is locked for writing
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*
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* @param xpath path to a xapian database
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*
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* @return TRUE if it is locked, FALSE otherwise (or in case of error)
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*/
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gboolean mu_store_database_is_locked (const gchar *xpath);
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/**
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* get a specific message, based on its Xapian docid
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*
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* @param self a valid MuQuery instance
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* @param docid the Xapian docid for the wanted message
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* @param err receives error information, or NULL
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*
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* @return a MuMsg instance (use mu_msg_unref when done with it), or
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* NULL in case of error
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*/
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MuMsg* mu_store_get_msg (const MuStore *self, unsigned docid, GError **err)
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G_GNUC_WARN_UNUSED_RESULT;
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G_END_DECLS
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#endif /*__MU_STORE_H__*/
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