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use std::fmt;
use serde::de::{Deserialize, Deserializer, Error, MapAccess, Visitor};
use serde_value::Value;
use types::*;
/// This object represents an incoming update.
#[derive(Debug, Clone, PartialEq, PartialOrd)]
pub struct Update {
/// The update‘s unique identifier. Update identifiers start from a certain
/// positive number and increase sequentially.
pub id: Integer,
/// Kind of the incoming update.
pub kind: UpdateKind,
}
/// Kind of the incoming update.
#[derive(Debug, Clone, PartialEq, PartialOrd)]
pub enum UpdateKind {
/// New incoming message of any kind — text, photo, sticker, etc.
Message(Message),
/// New version of a message that is known to the bot and was edited
EditedMessage(Message),
/// New incoming channel post of any kind — text, photo, sticker, etc.
ChannelPost(ChannelPost),
/// New version of a channel post that is known to the bot and was edited
EditedChannelPost(ChannelPost),
// InlineQuery(InlineQuery),
// ChosenInlineResult(ChosenInlineResult),
CallbackQuery(CallbackQuery),
#[doc(hidden)]
Error(String),
#[doc(hidden)]
Unknown,
}
impl<'de> Deserialize<'de> for Update {
fn deserialize<D>(deserializer: D) -> Result<Update, D::Error>
where
D: Deserializer<'de>,
{
#[derive(Deserialize)]
#[serde(field_identifier, rename_all = "snake_case")]
enum Field {
UpdateId,
Message,
EditedMessage,
ChannelPost,
EditedChannelPost,
CallbackQuery,
}
struct UpdateVisitor;
impl<'de> Visitor<'de> for UpdateVisitor {
type Value = Update;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("Update")
}
fn visit_map<V>(self, mut map: V) -> Result<Self::Value, V::Error>
where
V: MapAccess<'de>,
{
let mut update_id = None;
let mut error: Option<V::Error> = None;
macro_rules! match_fields {
($(($variant:ident, $name:ident));*; ) => {{
$(
let mut $name = None;
)*
while let Some(key) = map.next_key()? {
match key {
Field::UpdateId => {
if update_id.is_some() {
return Err(Error::duplicate_field("update_id"));
}
update_id = Some(map.next_value()?)
},
$(
Field::$variant => {
if $name.is_some() {
return Err(Error::duplicate_field(stringify!($name)));
}
let value = map.next_value::<Value>()?;
match value.deserialize_into() {
Ok(value) => $name = Some(value),
Err(err) => error = Some(Error::custom(err)),
}
}
)*
}
}
let update_id = update_id.ok_or_else(|| Error::missing_field("update_id"))?;
if let Some(err) = error {
return Ok(Update {
id: update_id,
kind: UpdateKind::Error(format!("{}", err))
})
}
$(
if let Some(val) = $name {
return Ok(Update {
id: update_id,
kind: UpdateKind::$variant(val),
})
}
)*
return Ok(Update {
id: update_id,
kind: UpdateKind::Unknown,
})
}};
}
match_fields!(
(Message, message);
(EditedMessage, edited_message);
(ChannelPost, channel_post);
(EditedChannelPost, edited_channel_post);
(CallbackQuery, callback_query);
)
}
}
const FIELDS: &[&str] = &[
"update_id",
"message",
"edited_message",
"channel_post",
"edited_channel_post",
"callback_query",
];
deserializer.deserialize_struct("Duration", FIELDS, UpdateVisitor)
}
}