You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
120 lines
3.3 KiB
120 lines
3.3 KiB
use super::{deserialise, Mastodon, Result};
|
|
use entities::itemsiter::ItemsIter;
|
|
use reqwest::{
|
|
header::{Link, RelationType},
|
|
Response,
|
|
};
|
|
use serde::Deserialize;
|
|
use url::Url;
|
|
|
|
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>,
|
|
}
|
|
|
|
macro_rules! pages {
|
|
($($direction:ident: $fun:ident),*) => {
|
|
|
|
$(
|
|
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.client.get(url)
|
|
.headers(self.mastodon.headers.clone())
|
|
.send()?;
|
|
|
|
let (prev, next) = get_links(&response)?;
|
|
self.next = next;
|
|
self.prev = prev;
|
|
|
|
deserialise(response)
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
impl<'a, T: for<'de> Deserialize<'de>> Page<'a, T> {
|
|
pages! {
|
|
next: next_page,
|
|
prev: prev_page
|
|
}
|
|
|
|
pub 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 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<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>() {
|
|
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))
|
|
}
|
|
|