mirror of https://git.meli.delivery/meli/meli
melib/nntp: add support for storing read status locally
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/*
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* meli - nntp module.
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*
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* Copyright 2023 Manos Pitsidianakis
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*
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* This file is part of meli.
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*
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* meli is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* meli 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 meli. If not, see <http://www.gnu.org/licenses/>.
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*/
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//! Store article seen/read flags in an sqlite3 database, since NNTP has no
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//! concept of server-side flag bookkeeping.
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pub use inner::*;
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#[cfg(feature = "sqlite3")]
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mod inner {
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use crate::{
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backends::nntp::UID,
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email::Flag,
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utils::sqlite3::{self, Connection, DatabaseDescription},
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EnvelopeHash, MailboxHash, Result,
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};
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pub const DB_DESCRIPTION: DatabaseDescription = DatabaseDescription {
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name: "nntp_store.db",
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init_script: Some(
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"PRAGMA foreign_keys = true;
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PRAGMA encoding = 'UTF-8';
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CREATE TABLE IF NOT EXISTS article (
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hash INTEGER NOT NULL,
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mailbox_hash INTEGER NOT NULL,
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uid INTEGER NOT NULL,
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flags INTEGER NOT NULL DEFAULT 0,
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tags TEXT,
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PRIMARY KEY (mailbox_hash, uid)
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);
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CREATE INDEX IF NOT EXISTS article_uid_idx ON article(mailbox_hash, uid);
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CREATE INDEX IF NOT EXISTS article_idx ON article(hash);",
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),
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version: 1,
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};
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#[derive(Debug)]
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pub struct Store {
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connection: Connection,
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}
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impl Store {
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pub fn new(id: &str) -> Result<Self> {
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Ok(Self {
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connection: sqlite3::open_or_create_db(&DB_DESCRIPTION, Some(id))?,
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})
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}
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pub fn set_flags(
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&self,
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envelope_hash: EnvelopeHash,
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mailbox_hash: MailboxHash,
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uid: UID,
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new_value: Flag,
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) -> Result<()> {
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self.connection.execute(
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"INSERT OR REPLACE INTO article(hash, mailbox_hash, uid, flags) VALUES (?, ?, ?, \
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?)",
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sqlite3::params![&envelope_hash, &mailbox_hash, &uid, &new_value.bits()],
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)?;
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Ok(())
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}
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pub fn flags(
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&self,
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envelope_hash: EnvelopeHash,
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mailbox_hash: MailboxHash,
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uid: UID,
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) -> Result<Flag> {
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self.connection.execute(
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"INSERT OR IGNORE INTO article(hash,mailbox_hash,uid,flags) VALUES(?1,?2,?3,0);",
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sqlite3::params![&envelope_hash, &mailbox_hash, &uid],
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)?;
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let mut stmt = self.connection.prepare(
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"SELECT flags FROM article WHERE hash = ?1 AND mailbox_hash = ?2 AND uid = ?3;",
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)?;
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Ok(Flag::from_bits({
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stmt.query_row(
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sqlite3::params![&envelope_hash, &mailbox_hash, &uid],
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|row| {
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let flag: u8 = row.get(0)?;
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Ok(flag)
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},
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)?
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})
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.unwrap_or_default())
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}
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}
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}
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#[cfg(not(feature = "sqlite3"))]
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mod inner {
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use crate::{
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backends::nntp::UID, email::Flag, EnvelopeHash, Error, ErrorKind, MailboxHash, Result,
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};
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#[derive(Debug)]
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pub struct Store;
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impl Store {
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pub fn new(_: &str) -> Result<Self> {
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Ok(Self)
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}
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pub fn set_flags(&self, _: EnvelopeHash, _: MailboxHash, _: UID, _: Flag) -> Result<()> {
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Ok(())
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}
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pub fn flags(&self, _: EnvelopeHash, _: MailboxHash, _: UID) -> Result<Flag> {
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Err(Error::new(
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"NNTP store flag cache accessed but this copy of melib isn't built with sqlite3 \
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support. This is a bug and should be reported.",
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)
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.set_kind(ErrorKind::Bug))
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}
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}
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}
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