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|
use super::{deserialise, Mastodon, Result};
use crate::entities::itemsiter::ItemsIter;
use hyper_old_types::header::{parsing, Link, RelationType};
use reqwest::{blocking::Response, header::LINK};
use serde::Deserialize;
use url::Url;
macro_rules! pages {
($($direction:ident: $fun:ident),*) => {
$(
doc_comment::doc_comment!(concat!(
"Method to retrieve the ", stringify!($direction), " page of results"),
pub fn $fun(&mut self) -> Result<Option<Vec<T>>> {
let url = match self.$direction.take() {
Some(s) => s,
None => return Ok(None),
};
let response = self.mastodon.send(
self.mastodon.client.get(url)
)?;
let (prev, next) = get_links(&response)?;
self.next = next;
self.prev = prev;
deserialise(response)
});
)*
}
}
/// Owned version of the `Page` struct in this module. Allows this to be more
/// easily stored for later use
///
/// # Example
///
/// ```no_run
/// # extern crate elefren;
/// # use elefren::Mastodon;
/// # use elefren::page::OwnedPage;
/// # use elefren::entities::status::Status;
/// # use std::cell::RefCell;
/// # use elefren::prelude::*;
/// # fn main() -> Result<(), elefren::Error> {
/// # let data = Data {
/// # base: "".into(),
/// # client_id: "".into(),
/// # client_secret: "".into(),
/// # redirect: "".into(),
/// # token: "".into(),
/// # };
/// struct HomeTimeline {
/// client: Mastodon,
/// page: RefCell<Option<OwnedPage<Status>>>,
/// }
/// let client = Mastodon::from(data);
/// let home = client.get_home_timeline()?.into_owned();
/// let tl = HomeTimeline {
/// client,
/// page: RefCell::new(Some(home)),
/// };
/// # Ok(())
/// # }
/// ```
#[derive(Debug, Clone)]
pub struct OwnedPage<T: for<'de> Deserialize<'de>> {
mastodon: Mastodon,
next: Option<Url>,
prev: Option<Url>,
/// Initial set of items
pub initial_items: Vec<T>,
}
impl<T: for<'de> Deserialize<'de>> OwnedPage<T> {
pages! {
next: next_page,
prev: prev_page
}
}
impl<'a, T: for<'de> Deserialize<'de>> From<Page<'a, T>> for OwnedPage<T> {
fn from(page: Page<'a, T>) -> OwnedPage<T> {
OwnedPage {
mastodon: page.mastodon.clone(),
next: page.next,
prev: page.prev,
initial_items: page.initial_items,
}
}
}
/// Represents a single page of API results
#[derive(Debug, Clone)]
pub struct Page<'a, T: for<'de> Deserialize<'de>> {
mastodon: &'a Mastodon,
next: Option<Url>,
prev: Option<Url>,
/// Initial set of items
pub initial_items: Vec<T>,
}
impl<'a, T: for<'de> Deserialize<'de>> Page<'a, T> {
pages! {
next: next_page,
prev: prev_page
}
pub(crate) fn new(mastodon: &'a Mastodon, response: Response) -> Result<Self> {
let (prev, next) = get_links(&response)?;
Ok(Page {
initial_items: deserialise(response)?,
next,
prev,
mastodon,
})
}
}
impl<'a, T: Clone + for<'de> Deserialize<'de>> Page<'a, T> {
/// Returns an owned version of this struct that doesn't borrow the client
/// that created it
///
/// # Example
///
/// ```no_run
/// # extern crate elefren;
/// # use elefren::Mastodon;
/// # use elefren::page::OwnedPage;
/// # use elefren::entities::status::Status;
/// # use std::cell::RefCell;
/// # use elefren::prelude::*;
/// # fn main() -> Result<(), elefren::Error> {
/// # let data = Data {
/// # base: "".into(),
/// # client_id: "".into(),
/// # client_secret: "".into(),
/// # redirect: "".into(),
/// # token: "".into(),
/// # };
/// struct HomeTimeline {
/// client: Mastodon,
/// page: RefCell<Option<OwnedPage<Status>>>,
/// }
/// let client = Mastodon::from(data);
/// let home = client.get_home_timeline()?.into_owned();
/// let tl = HomeTimeline {
/// client,
/// page: RefCell::new(Some(home)),
/// };
/// # Ok(())
/// # }
/// ```
pub fn into_owned(self) -> OwnedPage<T> {
OwnedPage::from(self)
}
/// Returns an iterator that provides a stream of `T`s
///
/// This abstracts away the process of iterating over each item in a page,
/// then making an http call, then iterating over each item in the new
/// page, etc. The iterator provides a stream of `T`s, calling
/// `self.next_page()`
/// when necessary to get
/// more of them, until
/// there are no more items.
///
/// # Example
///
/// ```no_run
/// # extern crate elefren;
/// # use std::error::Error;
/// use elefren::prelude::*;
/// # fn main() -> Result<(), Box<dyn Error>> {
/// # let data = Data {
/// # base: "".into(),
/// # client_id: "".into(),
/// # client_secret: "".into(),
/// # redirect: "".into(),
/// # token: "".into(),
/// # };
/// let mastodon = Mastodon::from(data);
/// let req = StatusesRequest::new();
/// let resp = mastodon.statuses("some-id", req)?;
/// for status in resp.items_iter() {
/// // do something with status
/// }
/// # Ok(())
/// # }
/// ```
pub fn items_iter(self) -> impl Iterator<Item = T> + 'a
where
T: 'a,
{
ItemsIter::new(self)
}
}
fn get_links(response: &Response) -> Result<(Option<Url>, Option<Url>)> {
let mut prev = None;
let mut next = None;
if let Some(link_header) = response.headers().get(LINK) {
let link_header = link_header.to_str()?;
let link_header = link_header.as_bytes();
let link_header: Link = parsing::from_raw_str(&link_header)?;
for value in link_header.values() {
if let Some(relations) = value.rel() {
if relations.contains(&RelationType::Next) {
next = Some(Url::parse(value.link())?);
}
if relations.contains(&RelationType::Prev) {
prev = Some(Url::parse(value.link())?);
}
}
}
}
Ok((prev, next))
}
|
