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sync: refactor to action architecture

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this makes for an easy --dry-run implementation
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FliegendeWurst 2022-02-13 15:22:16 +01:00 committed by Arne Keller
parent 1f2d329549
commit 6d277d588a
2 changed files with 369 additions and 188 deletions
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219
inboxid-sync/src/lib.rs Normal file
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@ -0,0 +1,219 @@
use std::{collections::HashMap, borrow::Cow, fmt::Display};
use anyhow::Context;
use imap::types::{Flag, NameAttribute};
use itertools::Itertools;
use maildir::Maildir;
use inboxid_lib::*;
use mailparse::parse_header;
use rusqlite::{Row, params, types::FromSql};
pub static TRASH: NameAttribute = NameAttribute::Custom(Cow::Borrowed("\\Trash"));
pub enum SyncAction {
TrashRemote(String, MaildirID),
TrashLocal(String, MaildirID),
DeleteRemote(String, MaildirID),
DeleteLocal(String, MaildirID),
UpdateFlags(String, Vec<(MaildirID, Vec<Flag<'static>>, String)>),
Hardlink(String, Vec<(MaildirID, String, Vec<Flag<'static>>)>),
Fetch(String, Vec<MaildirID>),
RemoveStale(HashMap<String, Vec<(u32, u32, u64)>>)
}
impl SyncAction {
pub fn mailbox(&self) -> Option<&str> {
match self {
TrashRemote(mailbox, _) => Some(mailbox),
TrashLocal(mailbox, _) => Some(mailbox),
DeleteRemote(mailbox, _) => Some(mailbox),
DeleteLocal(mailbox, _) => Some(mailbox),
UpdateFlags(mailbox, _) => Some(mailbox),
Hardlink(mailbox, _) => Some(mailbox),
Fetch(mailbox, _) => Some(mailbox),
RemoveStale(_) => None,
}
}
}
use SyncAction::*;
impl Display for SyncAction {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
TrashRemote(mailbox, id) => write!(f, "thrash remotely: {}/{}\n", mailbox, id)?,
TrashLocal(mailbox, id) => write!(f, "thrash locally: {}/{}\n", mailbox, id)?,
DeleteRemote(mailbox, id) => write!(f, "delete remotely: {}/{}\n", mailbox, id)?,
DeleteLocal(mailbox, id) => write!(f, "delete locally: {}/{}\n", mailbox, id)?,
UpdateFlags(mailbox, _) => write!(f, "updating flags of mail in {}\n", mailbox)?,
Hardlink(mailbox, id) => write!(f, "hardlink from local: {}/{:?}\n", mailbox, id)?,
Fetch(mailbox, id) => write!(f, "fetch: {}/{:?}", mailbox, id)?,
RemoveStale(map) => write!(f, "remove stale mail: {:?}", map)?,
}
Ok(())
}
}
pub fn compute_sync_actions(
host: &str,
user: &str,
password: &str,
port: u16,
mailboxes: &[String]
) -> Result<(Vec<SyncAction>, HashMap<String, HashMap<String, (u32, u32, MaildirID, Vec<Flag<'static>>)>>)> {
let mut actions = Vec::new();
let mut db = get_db()?;
let mut imap_session = connect(host, port, user, password)?;
println!("getting capabilities..");
let caps = imap_session.capabilities()?;
println!("capabilities: {}", caps.iter().map(|x| format!("{:?}", x)).join(" "));
let mut names = Vec::new();
let list = imap_session.list(None, Some("*"))?;
for x in list.iter() {
println!("{:?}", x);
names.push(x);
}
let mut remote = HashMap::new();
for &name in &names {
let mailbox = name.name();
// if the user specified some mailboxes, only process those
if !mailboxes.is_empty() && !mailboxes.iter().any(|x| x == mailbox) {
continue;
}
println!("indexing {}", mailbox);
let resp = imap_session.examine(mailbox)?;
let uid_validity = resp.uid_validity.unwrap();
let mut mails = HashMap::new();
let messages = imap_session.uid_fetch("1:*", "(FLAGS BODY[HEADER.FIELDS (MESSAGE-ID)])")?;
for m in messages.iter() {
let id = MaildirID::new(uid_validity, m.uid.unwrap());
let flags = m.flags();
if flags.contains(&Flag::Deleted) {
continue;
}
let header = m.header().unwrap();
let mut message_id = parse_header(header).map(|x| x.0.get_value()).unwrap_or_default();
if message_id.is_empty() {
message_id = fallback_mid(mailbox, id);
}
let flags = flags.iter().map(|x| remove_cow(x)).collect_vec();
mails.insert(message_id, (id.uid_validity, id.uid, id, flags));
}
remote.insert(mailbox.to_string(), mails);
}
// start a transaction to fully simulate fetching behaviour (drop changes afterwards)
let tx = db.transaction()?;
let mut have_mail = tx.prepare("SELECT mailbox, uid, flags FROM mail WHERE message_id = ?")?;
let mut delete_mail = tx.prepare("DELETE FROM mail WHERE mailbox = ? AND uid = ?")?;
let mut all_mail = tx.prepare("SELECT uid, message_id, flags FROM mail WHERE mailbox = ?")?;
let mut save_mail = tx.prepare("INSERT INTO mail VALUES (?,?,?,?)")?;
let mut maildirs: HashMap<String, Maildir> = names.iter().map(|&x| (x.name().to_owned(), get_maildir(x.name()).unwrap())).collect();
let mut printed_trash_warning = false;
let trash_dir = names.iter().filter(|x| x.attributes().iter().any(|x| *x == TRASH)).map(|x| x.name()).next();
let mut to_remove: HashMap<String, _> = HashMap::new();
for &name in &names {
let mailbox = name.name();
// if the user specified some mailboxes, only process those
if !mailboxes.is_empty() && !mailboxes.iter().any(|x| x == mailbox) {
continue;
}
let is_trash = name.attributes().iter().any(|x| *x == TRASH);
let remote_mails = remote.get_mut(mailbox).unwrap();
println!("selecting {}", mailbox);
imap_session.select(mailbox).context("select failed")?;
let all_mails = all_mail.query_map(params![mailbox], map3rows::<i64, String, String>)?;
for x in all_mails {
let (uid, mid, flags) = x?;
let uid: MaildirID = uid.into();
if flags.contains(TRASHED) && !is_trash {
if let Some(_) = trash_dir {
println!("trashing: {}/{}", mailbox, uid);
if remote_mails.contains_key(&mid) {
actions.push(TrashRemote(mailbox.to_owned(), uid));
} else {
actions.push(TrashLocal(mailbox.to_owned(), uid));
}
delete_mail.execute(params![mailbox, uid])?;
} else if !printed_trash_warning {
println!("Warning: unable to trash mail, no trash folder found!");
printed_trash_warning = true;
}
} else if flags.contains(DELETE) {
println!("deleting: {}/{}", mailbox, uid);
if remote_mails.contains_key(&mid) {
actions.push(DeleteRemote(mailbox.to_owned(), uid));
} else {
actions.push(DeleteLocal(mailbox.to_owned(), uid));
}
delete_mail.execute(params![mailbox, uid])?;
}
}
let mut to_flag = Vec::new();
let mut to_fetch = Vec::new();
let mut to_hardlink = Vec::new();
for (message_id, entry) in remote_mails.iter_mut() {
let (uid1, uid2, full_uid, remote_flags) = entry;
let local = have_mail.query_map(params![message_id], map3rows::<String, MaildirID, String>)?.map(|x| x.unwrap()).collect_vec();
if let Some((_, full_uid, flags)) = local.iter().filter(|x| x.0 == mailbox && x.1 == *full_uid).next() {
to_flag.push((*full_uid, remote_flags.clone(), flags.clone()));
continue;
}
if !local.is_empty() {
let (_, _, flags) = &local[0];
let new_uid = MaildirID::new(*uid1, *uid2);
to_hardlink.push((new_uid, message_id.clone(), remote_flags.clone()));
save_mail.execute(params![mailbox, new_uid.to_i64(), message_id, flags])?;
} else if !is_trash { // do not fetch trashed mail
println!("fetching {:?} {:?} as it is not in {:?}", uid2, message_id, local);
let new_uid = MaildirID::new(*uid1, *uid2);
to_fetch.push(new_uid);
}
}
if !to_flag.is_empty() {
actions.push(UpdateFlags(mailbox.to_string(), to_flag));
}
if !to_hardlink.is_empty() {
actions.push(Hardlink(mailbox.to_string(), to_hardlink));
}
if !to_fetch.is_empty() {
actions.push(Fetch(mailbox.to_string(), to_fetch));
}
let mails = all_mail.query_map(params![mailbox], |row|
Ok((load_i64(row.get::<_, i64>(0)?), row.get::<_, String>(1)?)))?
.map(|x| x.unwrap()).collect_vec();
let mut removed = Vec::new();
for (uid, message_id) in mails {
let uid1 = (uid >> 32) as u32;
let uid2 = ((uid << 32) >> 32) as u32;
if !remote_mails.contains_key(&message_id) && !message_id.ends_with("@no-message-id>") {
removed.push((uid1, uid2, uid));
}
}
if !removed.is_empty() {
to_remove.insert(mailbox.to_string(), removed);
}
}
actions.push(RemoveStale(to_remove));
// be nice to the server and log out
imap_session.logout()?;
Ok((actions, remote))
}
pub fn map3rows<A: FromSql, B: FromSql, C: FromSql>(row: &Row) -> rusqlite::Result<(A, B, C)> {
let a = row.get::<_, A>(0)?;
let b = row.get::<_, B>(1)?;
let c = row.get::<_, C>(2)?;
Ok((a, b, c))
}

294
inboxid-sync/src/main.rs
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@ -1,25 +1,27 @@
use std::{borrow::Cow, collections::HashMap, env};
use std::{env, collections::HashMap};
use anyhow::Context;
use imap::types::{Flag, NameAttribute};
use imap::types::Flag;
use itertools::Itertools;
use maildir::Maildir;
use inboxid_lib::*;
use mailparse::{parse_header, parse_headers};
use rusqlite::{Row, params, types::FromSql};
const TRASH: NameAttribute = NameAttribute::Custom(Cow::Borrowed("\\Trash"));
use inboxid_sync::*;
use inboxid_sync::SyncAction::*;
use maildir::Maildir;
use mailparse::parse_headers;
use rusqlite::params;
fn main() -> Result<()> {
let host = env::var("MAILHOST").expect("missing envvar MAILHOST");
let user = env::var("MAILUSER").expect("missing envvar MAILUSER");
let password = env::var("MAILPASSWORD").expect("missing envvar MAILPASSWORD");
let port = 993;
let args = env::args().skip(1).collect_vec();
let args = args.iter().map(|x| &**x).collect_vec();
let mut args = env::args().skip(1).peekable();
let dry_run = args.peek().map(|x| x == "--dry-run").unwrap_or(false);
sync(&host, &user, &password, port, &args)
let args = args.collect_vec();
sync(&host, &user, &password, port, &args, dry_run)
}
fn sync(
@ -27,8 +29,17 @@ fn sync(
user: &str,
password: &str,
port: u16,
mailboxes: &[&str]
mailboxes: &[String],
dry_run: bool
) -> Result<()> {
let (actions, remote) = compute_sync_actions(host, user, password, port, mailboxes)?;
if dry_run {
for action in actions {
println!("{}", action);
}
return Ok(());
}
// perform actions
let db = get_db()?;
let mut imap_session = connect(host, port, user, password)?;
println!("getting capabilities..");
@ -41,41 +52,13 @@ fn sync(
println!("{:?}", x);
names.push(x);
}
let mut remote = HashMap::new();
for &name in &names {
let mailbox = name.name();
// if the user specified some mailboxes, only process those
if !mailboxes.is_empty() && !mailboxes.contains(&mailbox) {
continue;
}
println!("indexing {}", mailbox);
let resp = imap_session.examine(mailbox)?;
let uid_validity = resp.uid_validity.unwrap();
let mut mails = HashMap::new();
let messages = imap_session.uid_fetch("1:*", "(FLAGS BODY[HEADER.FIELDS (MESSAGE-ID)])")?;
for m in messages.iter() {
let id = MaildirID::new(uid_validity, m.uid.unwrap());
let flags = m.flags();
if flags.contains(&Flag::Deleted) {
continue;
}
let header = m.header().unwrap();
let mut message_id = parse_header(header).map(|x| x.0.get_value()).unwrap_or_default();
if message_id.is_empty() {
message_id = fallback_mid(mailbox, id);
}
let flags = flags.iter().map(|x| remove_cow(x)).collect_vec();
mails.insert(message_id, (id.uid_validity, id.uid, id, flags));
}
remote.insert(mailbox, mails);
let trash_dir = names.iter().filter(|x| x.attributes().iter().any(|x| *x == TRASH)).map(|x| x.name()).next();
if trash_dir.is_none() {
println!("Warning: unable to trash mail, no trash folder found!");
}
let mut have_mail = db.prepare("SELECT mailbox, uid, flags FROM mail WHERE message_id = ?")?;
let mut delete_mail = db.prepare("DELETE FROM mail WHERE mailbox = ? AND uid = ?")?;
let mut all_mail = db.prepare("SELECT uid, message_id, flags FROM mail WHERE mailbox = ?")?;
let mut save_mail = db.prepare("INSERT INTO mail VALUES (?,?,?,?)")?;
let mut maildirs: HashMap<String, Maildir> = names.iter().map(|&x| (x.name().to_owned(), get_maildir(x.name()).unwrap())).collect();
macro_rules! ensure_mailbox {
@ -86,110 +69,108 @@ fn sync(
&maildirs[$name]
}}
}
let mut printed_trash_warning = false;
let trash_dir = names.iter().filter(|x| x.attributes().iter().any(|x| *x == TRASH)).map(|x| x.name()).next();
let mut to_remove: HashMap<&str, _> = HashMap::new();
for &name in &names {
let mailbox = name.name();
// if the user specified some mailboxes, only process those
if !mailboxes.is_empty() && !mailboxes.contains(&mailbox) {
continue;
}
let is_trash = name.attributes().iter().any(|x| *x == TRASH);
let remote_mails = remote.get_mut(mailbox).unwrap();
println!("selecting {}", mailbox);
imap_session.select(mailbox).context("select failed")?;
let all_mails = all_mail.query_map(params![mailbox], map3rows::<i64, String, String>)?;
let mut deleted_some = false;
for x in all_mails {
let (uid, mid, flags) = x?;
let uid: MaildirID = uid.into();
if flags.contains(TRASHED) && !is_trash {
if let Some(trash_dir) = trash_dir {
println!("trashing: {}/{}", mailbox, uid);
if remote_mails.contains_key(&mid) {
imap_session.uid_mv(uid.to_imap(), trash_dir)?;
} else {
println!("Warning: only trashing locally!");
}
let gone = ensure_mailbox!(".gone");
let uid_name = uid.to_string();
let _ = maildir_cp(&maildirs[mailbox], gone, &uid_name, &uid_name, "", true);
maildirs[mailbox].delete(&uid_name)?;
delete_mail.execute(params![mailbox, uid])?;
} else if !printed_trash_warning {
println!("Warning: unable to trash mail, no trash folder found!");
printed_trash_warning = true;
}
} else if flags.contains(DELETE) {
println!("deleting: {}/{}", mailbox, uid);
if remote_mails.contains_key(&mid) {
imap_session.uid_store(uid.to_imap(), "+FLAGS.SILENT (\\Deleted)")?;
} else {
println!("Warning: only deleting locally!");
}
remote_mails.remove(&mid);
delete_mail.execute(params![mailbox, uid])?;
maildirs[mailbox].delete(&uid.to_string())?;
deleted_some = true;
}
}
if deleted_some {
let mut selection = None;
for action in actions {
let mut uid_valid = None;
if let Some(mailbox) = action.mailbox() {
if selection.is_none() || selection.as_ref().unwrap() != mailbox {
if selection.is_some() {
println!("expunging..");
imap_session.expunge().context("expunge failed")?;
}
let mut to_fetch = Vec::new();
for (message_id, entry) in remote_mails.iter_mut() {
let (uid1, uid2, full_uid, remote_flags) = entry;
let local = have_mail.query_map(params![message_id], map3rows::<String, MaildirID, String>)?.map(|x| x.unwrap()).collect_vec();
macro_rules! update_flags {
($id:expr, $flags:expr) => {
let local_s = $flags.contains('S');
let local_u = $flags.contains(UNREAD);
let remote_s = remote_flags.contains(&Flag::Seen);
if local_s && !remote_s {
println!("setting Seen flag on {}/{}", mailbox, $id.uid);
imap_session.uid_store($id.to_imap(), "+FLAGS.SILENT (\\Seen)")?;
remote_flags.push(Flag::Seen);
} else if local_u && remote_s {
println!("removing Seen flag on {}/{}", mailbox, $id.uid);
imap_session.uid_store($id.to_imap(), "-FLAGS.SILENT (\\Seen)")?;
remote_flags.remove(remote_flags.iter().position(|x| x == &Flag::Seen).unwrap());
println!("selecting {}", mailbox);
uid_valid = imap_session.select(mailbox).context("select failed")?.uid_validity;
selection = Some(mailbox.to_string());
}
}
}
if let Some((_, full_uid, flags)) = local.iter().filter(|x| x.0 == mailbox && x.1 == *full_uid).next() {
update_flags!(full_uid, flags);
macro_rules! check_valid {
($uid_validity:expr) => {
if uid_valid.is_none() || $uid_validity != uid_valid.unwrap() {
println!("Warning: uid validity value changed, unable to process action!");
continue;
}
if !local.is_empty() {
}
}
macro_rules! update_flags {
($mailbox:expr, $id:expr, $remote_flags:expr, $flags:expr) => {
let local_s = $flags.contains('S');
let local_u = $flags.contains(UNREAD);
let remote_s = $remote_flags.contains(&Flag::Seen);
if local_s && !remote_s {
println!("setting Seen flag on {}/{}", $mailbox, $id.uid);
imap_session.uid_store($id.to_imap(), "+FLAGS.SILENT (\\Seen)")?;
$remote_flags.push(Flag::Seen);
} else if local_u && remote_s {
println!("removing Seen flag on {}/{}", $mailbox, $id.uid);
imap_session.uid_store($id.to_imap(), "-FLAGS.SILENT (\\Seen)")?;
$remote_flags.remove($remote_flags.iter().position(|x| x == &Flag::Seen).unwrap());
}
}
}
match action {
TrashRemote(mailbox, id) => {
check_valid!(id.uid_validity);
if let Some(trash_dir) = trash_dir {
println!("trashing: {}/{}", mailbox, id.uid);
imap_session.uid_mv(id.to_imap(), trash_dir)?;
let gone = ensure_mailbox!(".gone");
let uid_name = id.to_string();
let _ = maildir_cp(&maildirs[&mailbox], gone, &uid_name, &uid_name, "", true);
maildirs[&mailbox].delete(&uid_name)?;
delete_mail.execute(params![mailbox, id])?;
}
},
TrashLocal(mailbox, id) => {
check_valid!(id.uid_validity);
println!("trashing: {}/{}", mailbox, id.uid);
let gone = ensure_mailbox!(".gone");
let uid_name = id.to_string();
let _ = maildir_cp(&maildirs[&mailbox], gone, &uid_name, &uid_name, "", true);
maildirs[&mailbox].delete(&uid_name)?;
delete_mail.execute(params![mailbox, id])?;
},
DeleteRemote(mailbox, id) => {
imap_session.uid_store(id.to_imap(), "+FLAGS.SILENT (\\Deleted)")?;
delete_mail.execute(params![mailbox, id])?;
maildirs[&mailbox].delete(&id.to_string())?;
},
DeleteLocal(mailbox, id) => {
delete_mail.execute(params![mailbox, id])?;
maildirs[&mailbox].delete(&id.to_string())?;
},
UpdateFlags(mailbox, mut ids) => {
for (id, remote_flags, flags) in &mut ids {
check_valid!(id.uid_validity);
update_flags!(mailbox, id, remote_flags, flags);
}
},
Hardlink(mailbox, mut ids) => {
for (new_uid, message_id, remote_flags) in &mut ids {
check_valid!(new_uid.uid_validity);
let local = have_mail.query_map(params![&*message_id], map3rows::<String, MaildirID, String>)?.map(|x| x.unwrap()).collect_vec();
let (inbox, full_uid, flags) = &local[0];
let local_id = full_uid.to_string();
let new_uid = MaildirID::new(*uid1, *uid2);
let new_id = new_uid.to_string();
// hardlink mail
let maildir1 = ensure_mailbox!(inbox.as_str());
let maildir2 = &maildirs[mailbox];
let maildir2 = &maildirs[&mailbox];
println!("hardlinking: {}/{} -> {}/{}", inbox, local_id, mailbox, new_id);
maildir_cp(maildir1, maildir2, &local_id, &new_id, flags, false)?;
save_mail.execute(params![mailbox, new_uid.to_i64(), message_id, flags])?;
update_flags!(new_uid, flags);
} else if !is_trash { // do not fetch trashed mail
println!("fetching {:?} {:?} as it is not in {:?}", uid2, message_id, local);
to_fetch.push(uid2);
save_mail.execute(params![mailbox, &*new_uid, &*message_id, flags])?;
update_flags!(mailbox, new_uid, remote_flags, flags);
}
}
if !to_fetch.is_empty() {
let resp = imap_session.examine(mailbox)?;
let uid_validity = resp.uid_validity.unwrap();
let maildir = &maildirs[mailbox];
},
Fetch(mailbox, to_fetch) => {
let maildir = ensure_mailbox!(&mailbox);
check_valid!(to_fetch[0].uid_validity);
let fetch_range = to_fetch.into_iter().map(|x| x.to_string()).join(",");
let fetch_range = to_fetch.into_iter().map(|x| x.uid.to_string()).join(",");
let fetch = imap_session.uid_fetch(fetch_range, "RFC822")?;
for mail in fetch.iter() {
println!("fetching: {}/{}", mailbox, mail.uid.unwrap());
let id = MaildirID::new(uid_validity, mail.uid.unwrap());
let id = MaildirID::new(uid_valid.unwrap(), mail.uid.unwrap());
let id_name = id.to_string();
if !maildir.exists(&id_name) {
let mail_data = mail.body().unwrap_or_default();
@ -197,14 +178,32 @@ fn sync(
maildir.store_cur_with_id_flags(&id_name, &flags, mail_data)?;
let headers = parse_headers(&mail_data)?.0;
let message_id = headers.message_id(mailbox, id);
let message_id = headers.message_id(&mailbox, id);
save_mail.execute(params![mailbox, id.to_i64(), message_id, flags])?;
} else {
println!("warning: DB outdated, downloaded mail again");
}
}
},
RemoveStale(to_remove) => {
for mailbox in to_remove.keys() {
for &(uid1, uid2, uid) in &to_remove[&*mailbox] {
let uid_name = gen_id(uid1, uid2);
println!("removing: {}/{}", mailbox, uid_name);
let gone = ensure_mailbox!(".gone");
let maildir = &maildirs[&*mailbox];
// hardlink should only fail if the mail was already deleted
let _ = maildir_cp(maildir, gone, &uid_name, &uid_name, "", true);
maildir.delete(&uid_name)?;
delete_mail.execute(params![mailbox, store_i64(uid)])?;
}
let maildir = &maildirs[mailbox];
}
},
}
}
// final flag update
for (mailbox, remote_mails) in remote {
let maildir = ensure_mailbox!(&mailbox);
for message_id in remote_mails.keys() {
let (uid1, uid2, _, ref flags) = remote_mails[message_id];
let id = gen_id(uid1, uid2);
@ -214,43 +213,6 @@ fn sync(
Maildir::normalize_flags(&f)
});
}
let mails = all_mail.query_map(params![mailbox], |row|
Ok((load_i64(row.get::<_, i64>(0)?), row.get::<_, String>(1)?)))?
.map(|x| x.unwrap()).collect_vec();
let mut removed = Vec::new();
for (uid, message_id) in mails {
let uid1 = (uid >> 32) as u32;
let uid2 = ((uid << 32) >> 32) as u32;
if !remote_mails.contains_key(&message_id) && !message_id.ends_with("@no-message-id>") {
removed.push((uid1, uid2, uid));
}
}
if !removed.is_empty() {
to_remove.insert(mailbox, removed);
}
}
for &mailbox in to_remove.keys() {
for &(uid1, uid2, uid) in &to_remove[mailbox] {
let uid_name = gen_id(uid1, uid2);
println!("removing: {}/{}", mailbox, uid_name);
let gone = ensure_mailbox!(".gone");
let maildir = &maildirs[mailbox];
// hardlink should only fail if the mail was already deleted
let _ = maildir_cp(maildir, gone, &uid_name, &uid_name, "", true);
maildir.delete(&uid_name)?;
delete_mail.execute(params![mailbox, store_i64(uid)])?;
}
}
// be nice to the server and log out
imap_session.logout()?;
Ok(())
}
pub fn map3rows<A: FromSql, B: FromSql, C: FromSql>(row: &Row) -> rusqlite::Result<(A, B, C)> {
let a = row.get::<_, A>(0)?;
let b = row.get::<_, B>(1)?;
let c = row.get::<_, C>(2)?;
Ok((a, b, c))
}