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