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/*
* meli - nntp module.
*
* Copyright 2019 Manos Pitsidianakis
*
* This file is part of meli.
*
* meli 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.
*
* meli 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 meli. If not, see <http://www.gnu.org/licenses/>.
*/
use crate::get_conf_val;
use crate::get_path_hash;
use smallvec::SmallVec;
#[macro_use]
mod protocol_parser;
pub use protocol_parser::*;
mod mailbox;
pub use mailbox::*;
mod operations;
pub use operations::*;
mod connection;
pub use connection::*;
use crate::conf::AccountSettings;
use crate::connections::timeout;
use crate::email::*;
use crate::error::{MeliError, Result, ResultIntoMeliError};
use crate::{backends::*, Collection};
use futures::lock::Mutex as FutureMutex;
use futures::stream::Stream;
use std::collections::{hash_map::DefaultHasher, BTreeSet, HashMap, HashSet};
use std::hash::Hasher;
use std::pin::Pin;
use std::str::FromStr;
use std::sync::{Arc, Mutex};
use std::time::{Duration, Instant};
pub type UID = usize;
macro_rules! get_conf_val {
($s:ident[$var:literal]) => {
$s.extra.get($var).ok_or_else(|| {
MeliError::new(format!(
"Configuration error ({}): NNTP connection requires the field `{}` set",
$s.name.as_str(),
$var
))
})
};
($s:ident[$var:literal], $default:expr) => {
$s.extra
.get($var)
.map(|v| {
<_>::from_str(v).map_err(|e| {
MeliError::new(format!(
"Configuration error ({}) NNTP: Invalid value for field `{}`: {}\n{}",
$s.name.as_str(),
$var,
v,
e
))
})
})
.unwrap_or_else(|| Ok($default))
};
}
pub static SUPPORTED_CAPABILITIES: &[&str] = &[
#[cfg(feature = "deflate_compression")]
"COMPRESS DEFLATE",
"VERSION 2",
"NEWNEWS",
"POST",
"OVER",
"OVER MSGID",
"READER",
"STARTTLS",
"HDR",
"AUTHINFO USER",
];
#[derive(Debug, Clone)]
pub struct NntpServerConf {
pub server_hostname: String,
pub server_username: String,
pub server_password: String,
pub server_port: u16,
pub use_starttls: bool,
pub use_tls: bool,
pub require_auth: bool,
pub danger_accept_invalid_certs: bool,
pub extension_use: NntpExtensionUse,
}
type Capabilities = HashSet<String>;
#[derive(Debug)]
pub struct UIDStore {
account_hash: AccountHash,
account_name: Arc<String>,
offline_cache: bool,
capabilities: Arc<Mutex<Capabilities>>,
message_id_index: Arc<Mutex<HashMap<String, EnvelopeHash>>>,
hash_index: Arc<Mutex<HashMap<EnvelopeHash, (UID, MailboxHash)>>>,
uid_index: Arc<Mutex<HashMap<(MailboxHash, UID), EnvelopeHash>>>,
collection: Collection,
mailboxes: Arc<FutureMutex<HashMap<MailboxHash, NntpMailbox>>>,
is_online: Arc<Mutex<(Instant, Result<()>)>>,
event_consumer: BackendEventConsumer,
}
impl UIDStore {
fn new(
account_hash: AccountHash,
account_name: Arc<String>,
event_consumer: BackendEventConsumer,
) -> Self {
UIDStore {
account_hash,
account_name,
event_consumer,
offline_cache: false,
capabilities: Default::default(),
message_id_index: Default::default(),
hash_index: Default::default(),
uid_index: Default::default(),
mailboxes: Arc::new(FutureMutex::new(Default::default())),
collection: Collection::new(),
is_online: Arc::new(Mutex::new((
Instant::now(),
Err(MeliError::new("Account is uninitialised.")),
))),
}
}
}
#[derive(Debug)]
pub struct NntpType {
is_subscribed: Arc<IsSubscribedFn>,
connection: Arc<FutureMutex<NntpConnection>>,
server_conf: NntpServerConf,
uid_store: Arc<UIDStore>,
can_create_flags: Arc<Mutex<bool>>,
}
impl MailBackend for NntpType {
fn capabilities(&self) -> MailBackendCapabilities {
let mut extensions = self
.uid_store
.capabilities
.lock()
.unwrap()
.iter()
.map(|c| {
(
c.to_string(),
MailBackendExtensionStatus::Unsupported { comment: None },
)
})
.collect::<Vec<(String, MailBackendExtensionStatus)>>();
let mut supports_submission = false;
let NntpExtensionUse {
#[cfg(feature = "deflate_compression")]
deflate,
} = self.server_conf.extension_use;
{
for (name, status) in extensions.iter_mut() {
match name.as_str() {
s if s.eq_ignore_ascii_case("POST") => {
supports_submission = true;
*status = MailBackendExtensionStatus::Enabled { comment: None };
}
"COMPRESS DEFLATE" => {
#[cfg(feature = "deflate_compression")]
{
if deflate {
*status = MailBackendExtensionStatus::Enabled { comment: None };
} else {
*status = MailBackendExtensionStatus::Supported {
comment: Some("Disabled by user configuration"),
};
}
}
#[cfg(not(feature = "deflate_compression"))]
{
*status = MailBackendExtensionStatus::Unsupported {
comment: Some("melib not compiled with DEFLATE."),
};
}
}
_ => {
if SUPPORTED_CAPABILITIES.contains(&name.as_str()) {
*status = MailBackendExtensionStatus::Enabled { comment: None };
}
}
}
}
}
extensions.sort_by(|a, b| a.0.cmp(&b.0));
MailBackendCapabilities {
is_async: true,
is_remote: true,
supports_search: false,
extensions: Some(extensions),
supports_tags: false,
supports_submission,
}
}
fn fetch(
&mut self,
mailbox_hash: MailboxHash,
) -> Result<Pin<Box<dyn Stream<Item = Result<Vec<Envelope>>> + Send + 'static>>> {
let mut state = FetchState {
mailbox_hash,
uid_store: self.uid_store.clone(),
connection: self.connection.clone(),
high_low_total: None,
};
Ok(Box::pin(async_stream::try_stream! {
{
let f = &state.uid_store.mailboxes.lock().await[&state.mailbox_hash];
f.exists.lock().unwrap().clear();
f.unseen.lock().unwrap().clear();
};
loop {
if let Some(ret) = state.fetch_envs().await? {
yield ret;
continue;
}
break;
}
}))
}
fn refresh(&mut self, mailbox_hash: MailboxHash) -> ResultFuture<()> {
let uid_store = self.uid_store.clone();
let connection = self.connection.clone();
Ok(Box::pin(async move {
/* To get updates, either issue NEWNEWS if it's supported by the server, and fallback
* to OVER otherwise */
let mbox: NntpMailbox = uid_store.mailboxes.lock().await.get(&mailbox_hash).map(std::clone::Clone::clone).ok_or_else(|| MeliError::new(format!("Mailbox with hash {} not found in NNTP connection, this could possibly be a bug or it was deleted.", mailbox_hash)))?;
let latest_article: Option<crate::UnixTimestamp> =
mbox.latest_article.lock().unwrap().clone();
let (over_msgid_support, newnews_support): (bool, bool) = {
let caps = uid_store.capabilities.lock().unwrap();
(
caps.iter().any(|c| c.eq_ignore_ascii_case("OVER MSGID")),
caps.iter().any(|c| c.eq_ignore_ascii_case("NEWNEWS")),
)
};
let mut res = String::with_capacity(8 * 1024);
let mut conn = timeout(Some(Duration::from_secs(60 * 16)), connection.lock()).await?;
if let Some(mut latest_article) = latest_article {
let timestamp = latest_article - 10 * 60;
let datetime_str =
crate::datetime::timestamp_to_string(timestamp, Some("%Y%m%d %H%M%S"), true);
if newnews_support {
conn.send_command(
format!("NEWNEWS {} {}", &mbox.nntp_path, datetime_str).as_bytes(),
)
.await?;
conn.read_response(&mut res, true, &["230 "]).await?;
let message_ids = {
let message_id_lck = uid_store.message_id_index.lock().unwrap();
res.split_rn()
.skip(1)
.map(|s| s.trim())
.filter(|msg_id| !message_id_lck.contains_key(*msg_id))
.map(str::to_string)
.collect::<Vec<String>>()
};
if message_ids.is_empty() || !over_msgid_support {
return Ok(());
}
let mut env_hash_set: BTreeSet<EnvelopeHash> = Default::default();
for msg_id in message_ids {
conn.send_command(format!("OVER {}", msg_id).as_bytes())
.await?;
conn.read_response(&mut res, true, &["224 "]).await?;
let mut message_id_lck = uid_store.message_id_index.lock().unwrap();
let mut hash_index_lck = uid_store.hash_index.lock().unwrap();
let mut uid_index_lck = uid_store.uid_index.lock().unwrap();
for l in res.split_rn().skip(1) {
let (_, (num, env)) = protocol_parser::over_article(l)?;
env_hash_set.insert(env.hash());
message_id_lck.insert(env.message_id_display().to_string(), env.hash());
hash_index_lck.insert(env.hash(), (num, mailbox_hash));
uid_index_lck.insert((mailbox_hash, num), env.hash());
latest_article = std::cmp::max(latest_article, env.timestamp);
(uid_store.event_consumer)(
uid_store.account_hash,
crate::backends::BackendEvent::Refresh(RefreshEvent {
mailbox_hash,
account_hash: uid_store.account_hash,
kind: RefreshEventKind::Create(Box::new(env)),
}),
);
}
}
{
let f = &uid_store.mailboxes.lock().await[&mailbox_hash];
*f.latest_article.lock().unwrap() = Some(latest_article);
f.exists
.lock()
.unwrap()
.insert_existing_set(env_hash_set.clone());
f.unseen.lock().unwrap().insert_existing_set(env_hash_set);
}
return Ok(());
}
}
//conn.select_group(mailbox_hash, false, &mut res).await?;
Ok(())
}))
}
fn mailboxes(&self) -> ResultFuture<HashMap<MailboxHash, Mailbox>> {
let uid_store = self.uid_store.clone();
let connection = self.connection.clone();
Ok(Box::pin(async move {
NntpType::nntp_mailboxes(&connection).await?;
let mailboxes_lck = uid_store.mailboxes.lock().await;
let ret = mailboxes_lck
.iter()
.map(|(h, f)| (*h, Box::new(Clone::clone(f)) as Mailbox))
.collect();
Ok(ret)
}))
}
fn is_online(&self) -> ResultFuture<()> {
let connection = self.connection.clone();
Ok(Box::pin(async move {
match timeout(Some(Duration::from_secs(60 * 16)), connection.lock()).await {
Ok(mut conn) => {
debug!("is_online");
match debug!(timeout(Some(Duration::from_secs(60 * 16)), conn.connect()).await)
{
Ok(Ok(())) => Ok(()),
Err(err) | Ok(Err(err)) => {
conn.stream = Err(err.clone());
debug!(conn.connect().await)
}
}
}
Err(err) => Err(err),
}
}))
}
fn watch(&self) -> ResultFuture<()> {
Err(MeliError::new("Unimplemented.").set_kind(ErrorKind::NotImplemented))
}
fn operation(&self, env_hash: EnvelopeHash) -> Result<Box<dyn BackendOp>> {
let (uid, mailbox_hash) = if let Some(v) =
self.uid_store.hash_index.lock().unwrap().get(&env_hash)
{
*v
} else {
return Err(MeliError::new(
"Message not found in local cache, it might have been deleted before you requested it."
));
};
Ok(Box::new(NntpOp::new(
uid,
mailbox_hash,
self.connection.clone(),
self.uid_store.clone(),
)))
}
fn save(
&self,
_bytes: Vec<u8>,
_mailbox_hash: MailboxHash,
_flags: Option<Flag>,
) -> ResultFuture<()> {
Err(MeliError::new("NNTP doesn't support saving."))
}
fn copy_messages(
&mut self,
_env_hashes: EnvelopeHashBatch,
_source_mailbox_hash: MailboxHash,
_destination_mailbox_hash: MailboxHash,
_move_: bool,
) -> ResultFuture<()> {
Err(MeliError::new("NNTP doesn't support copying/moving."))
}
fn set_flags(
&mut self,
_env_hashes: EnvelopeHashBatch,
_mailbox_hash: MailboxHash,
_flags: SmallVec<[(std::result::Result<Flag, String>, bool); 8]>,
) -> ResultFuture<()> {
Err(MeliError::new("NNTP doesn't support flags."))
}
fn delete_messages(
&mut self,
_env_hashes: EnvelopeHashBatch,
_mailbox_hash: MailboxHash,
) -> ResultFuture<()> {
Err(MeliError::new("NNTP doesn't support deletion."))
}
fn as_any(&self) -> &dyn Any {
self
}
fn as_any_mut(&mut self) -> &mut dyn Any {
self
}
fn collection(&self) -> Collection {
self.uid_store.collection.clone()
}
fn create_mailbox(
&mut self,
_path: String,
) -> ResultFuture<(MailboxHash, HashMap<MailboxHash, Mailbox>)> {
Err(MeliError::new("Unimplemented."))
}
fn delete_mailbox(
&mut self,
_mailbox_hash: MailboxHash,
) -> ResultFuture<HashMap<MailboxHash, Mailbox>> {
Err(MeliError::new("Unimplemented."))
}
fn set_mailbox_subscription(
&mut self,
_mailbox_hash: MailboxHash,
_new_val: bool,
) -> ResultFuture<()> {
Err(MeliError::new("Unimplemented."))
}
fn rename_mailbox(
&mut self,
_mailbox_hash: MailboxHash,
_new_path: String,
) -> ResultFuture<Mailbox> {
Err(MeliError::new("Unimplemented."))
}
fn set_mailbox_permissions(
&mut self,
_mailbox_hash: MailboxHash,
_val: crate::backends::MailboxPermissions,
) -> ResultFuture<()> {
Err(MeliError::new("Unimplemented."))
}
fn search(
&self,
_query: crate::search::Query,
_mailbox_hash: Option<MailboxHash>,
) -> ResultFuture<SmallVec<[EnvelopeHash; 512]>> {
Err(MeliError::new("Unimplemented."))
}
fn submit(
&self,
bytes: Vec<u8>,
mailbox_hash: Option<MailboxHash>,
_flags: Option<Flag>,
) -> ResultFuture<()> {
let connection = self.connection.clone();
Ok(Box::pin(async move {
match timeout(Some(Duration::from_secs(60 * 16)), connection.lock()).await {
Ok(mut conn) => {
match &conn.stream {
Ok(stream) => {
if !stream.supports_submission {
return Err(MeliError::new("Server prohibits posting."));
}
}
Err(err) => return Err(err.clone()),
}
let mut res = String::with_capacity(8 * 1024);
if let Some(mailbox_hash) = mailbox_hash {
conn.select_group(mailbox_hash, false, &mut res).await?;
}
conn.send_command(b"POST").await?;
conn.read_response(&mut res, false, &["340 "]).await?;
conn.send_multiline_data_block(&bytes).await?;
conn.read_response(&mut res, false, &["240 "]).await?;
Ok(())
}
Err(err) => Err(err),
}
}))
}
}
impl NntpType {
pub fn new(
s: &AccountSettings,
is_subscribed: Box<dyn Fn(&str) -> bool + Send + Sync>,
event_consumer: BackendEventConsumer,
) -> Result<Box<dyn MailBackend>> {
let server_hostname = get_conf_val!(s["server_hostname"])?;
/*let server_username = get_conf_val!(s["server_username"], "")?;
let server_password = if !s.extra.contains_key("server_password_command") {
get_conf_val!(s["server_password"], "")?.to_string()
} else {
let invocation = get_conf_val!(s["server_password_command"])?;
let output = std::process::Command::new("sh")
.args(&["-c", invocation])
.stdin(std::process::Stdio::piped())
.stdout(std::process::Stdio::piped())
.stderr(std::process::Stdio::piped())
.output()?;
if !output.status.success() {
return Err(MeliError::new(format!(
"({}) server_password_command `{}` returned {}: {}",
s.name,
get_conf_val!(s["server_password_command"])?,
output.status,
String::from_utf8_lossy(&output.stderr)
)));
}
std::str::from_utf8(&output.stdout)?.trim_end().to_string()
};
*/
let server_port = get_conf_val!(s["server_port"], 119)?;
let use_tls = get_conf_val!(s["use_tls"], server_port == 563)?;
let use_starttls = use_tls && get_conf_val!(s["use_starttls"], false)?;
let danger_accept_invalid_certs: bool =
get_conf_val!(s["danger_accept_invalid_certs"], false)?;
let require_auth = get_conf_val!(s["require_auth"], false)?;
let server_conf = NntpServerConf {
server_hostname: server_hostname.to_string(),
server_username: if require_auth {
get_conf_val!(s["server_username"])?.to_string()
} else {
get_conf_val!(s["server_username"], String::new())?
},
server_password: if require_auth {
get_conf_val!(s["server_password"])?.to_string()
} else {
get_conf_val!(s["server_password"], String::new())?
},
require_auth,
server_port,
use_tls,
use_starttls,
danger_accept_invalid_certs,
extension_use: NntpExtensionUse {
#[cfg(feature = "deflate_compression")]
deflate: get_conf_val!(s["use_deflate"], false)?,
},
};
let account_hash = {
let mut hasher = DefaultHasher::new();
hasher.write(s.name.as_bytes());
hasher.finish()
};
let account_name = Arc::new(s.name().to_string());
let mut mailboxes = HashMap::default();
for (k, _f) in s.mailboxes.iter() {
let mailbox_hash = get_path_hash!(&k);
mailboxes.insert(
mailbox_hash,
NntpMailbox {
hash: mailbox_hash,
nntp_path: k.to_string(),
high_watermark: Arc::new(Mutex::new(0)),
low_watermark: Arc::new(Mutex::new(0)),
latest_article: Arc::new(Mutex::new(None)),
exists: Default::default(),
unseen: Default::default(),
},
);
}
if mailboxes.is_empty() {
return Err(MeliError::new(format!(
"{} has no newsgroups configured.",
account_name
)));
}
let uid_store: Arc<UIDStore> = Arc::new(UIDStore {
offline_cache: false, //get_conf_val!(s["X_header_caching"], false)?,
mailboxes: Arc::new(FutureMutex::new(mailboxes)),
..UIDStore::new(account_hash, account_name, event_consumer)
});
let connection = NntpConnection::new_connection(&server_conf, uid_store.clone());
Ok(Box::new(NntpType {
server_conf,
is_subscribed: Arc::new(IsSubscribedFn(is_subscribed)),
can_create_flags: Arc::new(Mutex::new(false)),
connection: Arc::new(FutureMutex::new(connection)),
uid_store,
}))
}
pub async fn nntp_mailboxes(connection: &Arc<FutureMutex<NntpConnection>>) -> Result<()> {
let mut res = String::with_capacity(8 * 1024);
let mut conn = connection.lock().await;
let command = {
let mailboxes_lck = conn.uid_store.mailboxes.lock().await;
mailboxes_lck
.values()
.fold("LIST ACTIVE ".to_string(), |mut acc, x| {
if acc.len() != "LIST ACTIVE ".len() {
acc.push(',');
}
acc.push_str(x.name());
acc
})
};
conn.send_command(command.as_bytes()).await?;
conn.read_response(&mut res, true, &["215 "])
.await
.chain_err_summary(|| {
format!(
"Could not get newsgroups {}: expected LIST ACTIVE response but got: {}",
&conn.uid_store.account_name, res
)
})?;
debug!(&res);
let mut mailboxes_lck = conn.uid_store.mailboxes.lock().await;
for l in res.split_rn().skip(1) {
let s = l.split_whitespace().collect::<SmallVec<[&str; 4]>>();
if s.len() != 3 {
continue;
}
let mailbox_hash = get_path_hash!(&s[0]);
mailboxes_lck.entry(mailbox_hash).and_modify(|m| {
*m.high_watermark.lock().unwrap() = usize::from_str(s[1]).unwrap_or(0);
*m.low_watermark.lock().unwrap() = usize::from_str(s[2]).unwrap_or(0);
});
}
Ok(())
}
pub fn validate_config(s: &AccountSettings) -> Result<()> {
let mut keys: HashSet<&'static str> = Default::default();
macro_rules! get_conf_val {
($s:ident[$var:literal]) => {{
keys.insert($var);
$s.extra.get($var).ok_or_else(|| {
MeliError::new(format!(
"Configuration error ({}): NNTP connection requires the field `{}` set",
$s.name.as_str(),
$var
))
})
}};
($s:ident[$var:literal], $default:expr) => {{
keys.insert($var);
$s.extra
.get($var)
.map(|v| {
<_>::from_str(v).map_err(|e| {
MeliError::new(format!(
"Configuration error ({}) NNTP: Invalid value for field `{}`: {}\n{}",
$s.name.as_str(),
$var,
v,
e
))
})
})
.unwrap_or_else(|| Ok($default))
}};
}
get_conf_val!(s["require_auth"], false)?;
get_conf_val!(s["server_hostname"])?;
get_conf_val!(s["server_username"], String::new())?;
if !s.extra.contains_key("server_password_command") {
get_conf_val!(s["server_password"], String::new())?;
} else if s.extra.contains_key("server_password") {
return Err(MeliError::new(format!(
"Configuration error ({}): both server_password and server_password_command are set, cannot choose",
s.name.as_str(),
)));
}
let server_port = get_conf_val!(s["server_port"], 119)?;
let use_tls = get_conf_val!(s["use_tls"], server_port == 563)?;
let use_starttls = get_conf_val!(s["use_starttls"], !(server_port == 563))?;
if !use_tls && use_starttls {
return Err(MeliError::new(format!(
"Configuration error ({}): incompatible use_tls and use_starttls values: use_tls = false, use_starttls = true",
s.name.as_str(),
)));
}
#[cfg(feature = "deflate_compression")]
get_conf_val!(s["use_deflate"], false)?;
#[cfg(not(feature = "deflate_compression"))]
if s.extra.contains_key("use_deflate") {
return Err(MeliError::new(format!(
"Configuration error ({}): setting `use_deflate` is set but this version of meli isn't compiled with DEFLATE support.",
s.name.as_str(),
)));
}
get_conf_val!(s["danger_accept_invalid_certs"], false)?;
let extra_keys = s
.extra
.keys()
.map(String::as_str)
.collect::<HashSet<&str>>();
let diff = extra_keys.difference(&keys).collect::<Vec<&&str>>();
if !diff.is_empty() {
return Err(MeliError::new(format!(
"Configuration error ({}) NNTP: the following flags are set but are not recognized: {:?}.",
s.name.as_str(), diff
)));
}
Ok(())
}
pub fn capabilities(&self) -> Vec<String> {
self.uid_store
.capabilities
.lock()
.unwrap()
.iter()
.cloned()
.collect::<Vec<String>>()
}
}
struct FetchState {
mailbox_hash: MailboxHash,
connection: Arc<FutureMutex<NntpConnection>>,
uid_store: Arc<UIDStore>,
high_low_total: Option<(usize, usize, usize)>,
}
impl FetchState {
async fn fetch_envs(&mut self) -> Result<Option<Vec<Envelope>>> {
let FetchState {
mailbox_hash,
ref connection,
ref uid_store,
ref mut high_low_total,
} = self;
let mailbox_hash = *mailbox_hash;
let mut res = String::with_capacity(8 * 1024);
let mut conn = connection.lock().await;
if high_low_total.is_none() {
conn.select_group(mailbox_hash, true, &mut res).await?;
/*
* Parameters
group Name of newsgroup
number Estimated number of articles in the group
low Reported low water mark
high Reported high water mark
*/
let s = res.split_whitespace().collect::<SmallVec<[&str; 6]>>();
let path = conn.uid_store.mailboxes.lock().await[&mailbox_hash]
.name()
.to_string();
if s.len() != 5 {
return Err(MeliError::new(format!(
"{} Could not select newsgroup {}: expected GROUP response but got: {}",
&uid_store.account_name, path, res
)));
}
let total = usize::from_str(s[1]).unwrap_or(0);
let _low = usize::from_str(s[2]).unwrap_or(0);
let high = usize::from_str(s[3]).unwrap_or(0);
*high_low_total = Some((high, _low, total));
{
let f = &uid_store.mailboxes.lock().await[&mailbox_hash];
f.exists.lock().unwrap().set_not_yet_seen(total);
f.unseen.lock().unwrap().set_not_yet_seen(total);
};
}
let (high, low, _) = high_low_total.unwrap();
if high <= low {
return Ok(None);
}
const CHUNK_SIZE: usize = 50000;
let new_low = std::cmp::max(low, high.saturating_sub(CHUNK_SIZE));
high_low_total.as_mut().unwrap().0 = new_low;
// FIXME: server might not implement OVER capability
conn.send_command(format!("OVER {}-{}", new_low, high).as_bytes())
.await?;
conn.read_response(&mut res, true, command_to_replycodes("OVER"))
.await
.chain_err_summary(|| {
format!(
"{} Could not select newsgroup: expected OVER response but got: {}",
&uid_store.account_name, res
)
})?;
let mut ret = Vec::with_capacity(high - new_low);
//hash_index: Arc<Mutex<HashMap<EnvelopeHash, (UID, MailboxHash)>>>,
//uid_index: Arc<Mutex<HashMap<(MailboxHash, UID), EnvelopeHash>>>,
let mut latest_article: Option<crate::UnixTimestamp> = None;
{
let mut message_id_lck = uid_store.message_id_index.lock().unwrap();
let mut hash_index_lck = uid_store.hash_index.lock().unwrap();
let mut uid_index_lck = uid_store.uid_index.lock().unwrap();
for l in res.split_rn().skip(1) {
let (_, (num, env)) = protocol_parser::over_article(l)?;
message_id_lck.insert(env.message_id_display().to_string(), env.hash());
hash_index_lck.insert(env.hash(), (num, mailbox_hash));
uid_index_lck.insert((mailbox_hash, num), env.hash());
if let Some(ref mut v) = latest_article {
*v = std::cmp::max(*v, env.timestamp);
} else {
latest_article = Some(env.timestamp);
}
ret.push(env);
}
}
{
let hash_set: BTreeSet<EnvelopeHash> = ret.iter().map(|env| env.hash()).collect();
let f = &uid_store.mailboxes.lock().await[&mailbox_hash];
*f.latest_article.lock().unwrap() = latest_article;
f.exists
.lock()
.unwrap()
.insert_existing_set(hash_set.clone());
f.unseen.lock().unwrap().insert_existing_set(hash_set);
};
Ok(Some(ret))
}
}