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//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015-2020 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
use std::sync::Mutex;
use std::sync::Arc;
use std::path::Path;
use anyhow::Result;
use anyhow::Error;
use notmuch_rs::Database;
use notmuch_rs::DatabaseMode;
use libimagerror::errors::Error as ErrorMsg;
#[derive(Debug)]
pub struct NotmuchConnection {
db: Arc<Mutex<Database>>,
open: bool,
}
impl Drop for NotmuchConnection {
fn drop(&mut self) {
if self.open {
let _ = self.db
.lock()
.map_err(|e| error!("Failed to get lock for connection to close notmuch database: {:?}", e))
.unwrap() // will panic.
.close()
.map_err(|e| error!("Could not close notmuch database: {:?}", e));
}
}
}
impl NotmuchConnection {
pub fn open<P>(p: P) -> Result<Self>
where P: AsRef<Path>
{
Database::open(&p, DatabaseMode::ReadOnly)
.map(Mutex::new)
.map(Arc::new)
.map(|db| {
NotmuchConnection {
db,
open: true,
}
})
.map_err(Error::from)
}
/// Close the connection
///
/// # Note
///
/// Use this function. If you don't, the destructor will close the connection and this might
/// panic!(), so be advised to use this non-panicing function to close the connection.
///
pub fn close(mut self) -> Result<()> {
self.db
.lock()
.map_err(|_| ErrorMsg::LockError)
.map_err(Error::from)
.and_then(|db| db.close().map_err(Error::from))?;
self.open = false;
Ok(())
}
pub(crate) fn execute<F, T>(&self, f: F) -> Result<T>
where F: FnOnce(&Database) -> Result<T>
{
self.db
.lock()
.map_err(|_| ErrorMsg::LockError)
.map_err(Error::from)
.and_then(|lock| f(&lock))
}
pub(crate) fn execute_atomic<F, T>(&self, f: F) -> Result<T>
where F: FnOnce(&Database) -> Result<T>
{
self.db
.lock()
.map_err(|_| ErrorMsg::LockError)
.map_err(Error::from)
.and_then(|lock| {
lock.begin_atomic()?;
let r = f(&lock);
lock.end_atomic()?;
r
})
}
}
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