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use std::iter::FromIterator;
use std::vec;
use futures::future::{self, Either, Loop, Future};
use new_tokio_smtp::{Cmd, Connection, ConnectionConfig, SetupTls};
use new_tokio_smtp::send_mail::{self as smtp};
use mail_common::MailType;
use mail_common::encoder::EncodingBuffer;
use mail::Context;
use mail::error::MailError;
use ::resolve_all::ResolveAll;
use ::request::MailRequest;
use ::error::{MailSendError, TransportError};
/// Result of encoding a mail.
pub type EncodeMailResult = Result<smtp::MailEnvelop, MailError>;
/// Creates a `Future` which encodes all mails.
///
/// To encode the mails this function turns every `MailRequest` into mails with
/// envelope data, then creates a `Future` resolving when the mail is ready to
/// be encoded and chain this result by offloading the actual encoding of each
/// mail to a thread pool. Lastly all of these `Future`s are polled in parallel
/// by the returned `Future`.
///
/// # Error
///
/// The `Future` will never error, but it will resolve to a vector of results
/// representing the encoding result for each mail in the input separately.
pub fn encode_mails(
requests: impl IntoIterator<Item=MailRequest>,
ctx: impl Context
//TODO[futures/v>=0.2 | rust/! type]: use Never or !
) -> impl Future<Item=Vec<EncodeMailResult>, Error=()> + Send
{
let pending = requests
.into_iter()
.map(|request| {
let (mail, envelop_data) =
match request.into_mail_with_envelop() {
Ok(pair) => pair,
Err(e) => return Either::A(future::err(e.into()))
};
let _ctx = ctx.clone();
let fut = mail
.into_encodeable_mail(ctx.clone())
.and_then(move |enc_mail| _ctx.offload_fn(move || {
let (mail_type, requirement) =
if envelop_data.needs_smtputf8() {
(MailType::Internationalized, smtp::EncodingRequirement::Smtputf8)
} else {
(MailType::Ascii, smtp::EncodingRequirement::None)
};
let mut buffer = EncodingBuffer::new(mail_type);
enc_mail.encode(&mut buffer)?;
let vec_buffer: Vec<_> = buffer.into();
let smtp_mail = smtp::Mail::new(requirement, vec_buffer);
Ok(smtp::MailEnvelop::from((smtp_mail, envelop_data)))
}));
Either::B(fut)
});
ResolveAll::from_iter(pending)
}
/// Results of sending an encoded mail.
pub type SendMailResult = Result<(), MailSendError>;
/// Sends all encoded mails through the given `Connection`.
///
/// This method accepts an iterator of `EncodedMailResult`'s as it's
/// meant to be chained with `encode_mails`.
///
/// # Error
///
/// The returned `Future` resolves to a vector of results, one for each mail
/// sent.
///
/// If a transport error happens (e.g. an I/O error) a tuple consisting of
/// the `Error`, the already sent mails and and iterator of the remaining mails is
/// returned.
pub fn send_encoded_mails<I>(con: Connection, mails: I)
-> impl Future<
Item=(Connection, Vec<SendMailResult>),
Error=(TransportError, Vec<SendMailResult>, I::IntoIter)>
where I: IntoIterator<Item=EncodeMailResult>, I::IntoIter: 'static
{
let iter = mails.into_iter();
let results = Vec::new();
let fut = future::loop_fn((con, iter, results), |(con, mut iter, mut results)| match iter.next() {
None => Either::A(future::ok(Loop::Break((con, results)))),
Some(Err(err)) => {
results.push(Err(MailSendError::from(err)));
Either::A(future::ok(Loop::Continue((con, iter, results))))
},
Some(Ok(envelop)) => Either::B(con
.send_mail(envelop)
.then(move |res| match res {
Ok((con, logic_result)) => {
results.push(logic_result.map_err(|(_idx, err)| MailSendError::from(err)));
Ok(Loop::Continue((con, iter, results)))
},
Err(err) => {
Err((TransportError::Io(err), results, iter))
}
}))
});
fut
}
/// Send mails _to a specific mail server_.
///
/// This encodes the mails, opens a connection, sends the mails over and
/// closes the connection again.
///
/// While this uses the `To` field of a mail to determine the SMTP receiver it
/// does not resolve the server based on the mail address domain. This means
/// it's best suited for sending to a Mail Submission Agent (MSA), but less for
/// sending to a Mail Exchanger (MX).
///
/// Automatically handling `Bcc`/`Cc` is _not yet_ implemented.
pub fn send_mails(
config: ConnectionConfig<impl Cmd, impl SetupTls>,
requests: impl IntoIterator<Item=MailRequest>,
ctx: impl Context)
-> impl Future<
Item=Vec<SendMailResult>,
Error=(TransportError, Vec<SendMailResult>, vec::IntoIter<EncodeMailResult>)>
{
let fut = encode_mails(requests, ctx)
.map_err(|_| unreachable!())
.and_then(|mails| {
if mails.iter().all(|r| r.is_err()) {
let send_skipped = mails
.into_iter()
.map(|result| match result {
Ok(_) => unreachable!(),
Err(err) => Err(MailSendError::Mail(err))
})
.collect();
Either::A(future::ok(send_skipped))
} else {
let fut = Connection
::connect(config)
.then(|result| match result {
Err(err) => Either::A(future::err((TransportError::Connecting(err), Vec::new(), mails.into_iter()))),
Ok(con) => Either::B(send_encoded_mails(con, mails))
})
.and_then(|(con, results)| con.quit().then(|_| Ok(results)));
Either::B(fut)
}
});
fut
}
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