Struct egg_mode::user::UserSearch

#[must_use = "search iterators are lazy and do nothing unless consumed"]
pub struct UserSearch<'a> {
    pub page_num: i32,
    pub page_size: i32,
    // some fields omitted
}

Represents an active user search.

This struct is returned by search and is meant to be used as a Stream. That means all the Stream adaptors are available:

use futures::Stream;

core.run(egg_mode::user::search("rustlang", &token, &handle).take(10).for_each(|resp| {
    println!("{}", resp.screen_name);
    Ok(())
})).unwrap();

You can even collect the results, letting you get one set of rate-limit information for the entire search setup:

use futures::Stream;
use egg_mode::Response;
use egg_mode::user::TwitterUser;
use egg_mode::error::Error;

// Because Streams don't have a FromIterator adaptor, we load all the responses first, then
// collect them into the final Vec
let names: Result<Response<Vec<TwitterUser>>, Error> =
    core.run(egg_mode::user::search("rustlang", &token, &handle).take(10).collect())
        .map(|resp| resp.into_iter().collect());

UserSearch has a couple adaptors of its own that you can use before consuming it. with_page_size will let you set how many users are pulled in with a single network call, and start_at_page lets you start your search at a specific page. Calling either of these after starting iteration will clear any current results.

The Stream implementation yields Response<TwitterUser> on a successful iteration, and Error for errors, so network errors, rate-limit errors and other issues are passed directly through in poll(). The Stream implementation will allow you to poll again after an error to re-initiate the late network call; this way, you can wait for your network connection to return or for your rate limit to refresh and try again from the same position.

Manual paging

The Stream implementation works by loading in a page of results (with size set by default or by with_page_size/the page_size field) when it's polled, and serving the individual elements from that locally-cached page until it runs out. This can be nice, but it also means that your only warning that something involves a network call is that the stream returns Ok(Async::NotReady), by which time the network call has already started. If you want to know that ahead of time, that's where the call() method comes in. By using call(), you can get a page of results directly from Twitter. With that you can iterate over the results and page forward and backward as needed:

let mut search = egg_mode::user::search("rustlang", &token, &handle).with_page_size(20);
let resp = core.run(search.call()).unwrap();

for user in resp.response {
   println!("{} (@{})", user.name, user.screen_name);
}

search.page_num += 1;
let resp = core.run(search.call()).unwrap();

for user in resp.response {
   println!("{} (@{})", user.name, user.screen_name);
}

Fields

page_num: i32

The current page of results being returned, starting at 1.

page_size: i32

The number of user records per page of results. Defaults to 10, maximum of 20.

Methods

impl<'a> UserSearch<'a>

fn with_page_size(self, page_size: i32) -> Self

Sets the page size used for the search query.

Calling this will invalidate any current search results, making the next call to next() perform a network call.

fn start_at_page(self, page_num: i32) -> Self

Sets the starting page number for the search query.

The search method begins numbering pages at 1. Calling this will invalidate any current search results, making the next call to next() perform a network call.

fn call(&self) -> FutureResponse<'a, Vec<TwitterUser>>

Performs the search for the current page of results.

This will automatically be called if you use the UserSearch as an iterator. This method is made public for convenience if you want to manage the pagination yourself. Remember to change page_num between calls.

Trait Implementations

impl<'a> Stream for UserSearch<'a>

type Item = Response<TwitterUser>

The type of item this stream will yield on success.

type Error = Error

The type of error this stream may generate.

fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error>

Attempt to pull out the next value of this stream, returning None if the stream is finished.

fn wait(self) -> Wait<Self>

Creates an iterator which blocks the current thread until each item of this stream is resolved.

fn into_future(self) -> StreamFuture<Self>

Converts this stream into a Future.

fn map<U, F>(self, f: F) -> Map<Self, F> where
    F: FnMut(Self::Item) -> U, 

Converts a stream of type T to a stream of type U.

fn map_err<U, F>(self, f: F) -> MapErr<Self, F> where
    F: FnMut(Self::Error) -> U, 

Converts a stream of error type T to a stream of error type U.

fn filter<F>(self, f: F) -> Filter<Self, F> where
    F: FnMut(&Self::Item) -> bool, 

Filters the values produced by this stream according to the provided predicate.

fn filter_map<F, B>(self, f: F) -> FilterMap<Self, F> where
    F: FnMut(Self::Item) -> Option<B>, 

Filters the values produced by this stream while simultaneously mapping them to a different type.

fn then<F, U>(self, f: F) -> Then<Self, F, U> where
    F: FnMut(Result<Self::Item, Self::Error>) -> U,
    U: IntoFuture, 

Chain on a computation for when a value is ready, passing the resulting item to the provided closure f.

fn and_then<F, U>(self, f: F) -> AndThen<Self, F, U> where
    F: FnMut(Self::Item) -> U,
    U: IntoFuture<Error = Self::Error>, 

Chain on a computation for when a value is ready, passing the successful results to the provided closure f.

fn or_else<F, U>(self, f: F) -> OrElse<Self, F, U> where
    F: FnMut(Self::Error) -> U,
    U: IntoFuture<Item = Self::Item>, 

Chain on a computation for when an error happens, passing the erroneous result to the provided closure f.

fn collect(self) -> Collect<Self>

Collect all of the values of this stream into a vector, returning a future representing the result of that computation.

fn concat2(self) -> Concat2<Self> where
    Self::Item: Extend<<Self::Item as IntoIterator>::Item>,
    Self::Item: IntoIterator,
    Self::Item: Default, 

Concatenate all results of a stream into a single extendable destination, returning a future representing the end result.

fn concat(self) -> Concat<Self> where
    Self::Item: Extend<<Self::Item as IntoIterator>::Item>,
    Self::Item: IntoIterator, 

Deprecated since 0.1.14

: please use Stream::concat2 instead

Concatenate all results of a stream into a single extendable destination, returning a future representing the end result.

fn fold<F, T, Fut>(self, init: T, f: F) -> Fold<Self, F, Fut, T> where
    F: FnMut(T, Self::Item) -> Fut,
    Fut: IntoFuture<Item = T>,
    Self::Error: From<<Fut as IntoFuture>::Error>, 

Execute an accumulating computation over a stream, collecting all the values into one final result.

fn flatten(self) -> Flatten<Self> where
    Self::Item: Stream,
    <Self::Item as Stream>::Error: From<Self::Error>, 

Flattens a stream of streams into just one continuous stream.

fn skip_while<P, R>(self, pred: P) -> SkipWhile<Self, P, R> where
    P: FnMut(&Self::Item) -> R,
    R: IntoFuture<Item = bool, Error = Self::Error>, 

Skip elements on this stream while the predicate provided resolves to true.

fn take_while<P, R>(self, pred: P) -> TakeWhile<Self, P, R> where
    P: FnMut(&Self::Item) -> R,
    R: IntoFuture<Item = bool, Error = Self::Error>, 

Take elements from this stream while the predicate provided resolves to true.

fn for_each<F, U>(self, f: F) -> ForEach<Self, F, U> where
    F: FnMut(Self::Item) -> U,
    U: IntoFuture<Item = (), Error = Self::Error>, 

Runs this stream to completion, executing the provided closure for each element on the stream.

fn from_err<E>(self) -> FromErr<Self, E> where
    E: From<Self::Error>, 

Map this stream's error to any error implementing From for this stream's Error, returning a new stream.

fn take(self, amt: u64) -> Take<Self>

Creates a new stream of at most amt items of the underlying stream.

fn skip(self, amt: u64) -> Skip<Self>

Creates a new stream which skips amt items of the underlying stream.

fn fuse(self) -> Fuse<Self>

Fuse a stream such that poll will never again be called once it has finished.

fn by_ref(&mut self) -> &mut Self

Borrows a stream, rather than consuming it.

fn catch_unwind(self) -> CatchUnwind<Self> where
    Self: UnwindSafe, 

Catches unwinding panics while polling the stream.

fn buffered(self, amt: usize) -> Buffered<Self> where
    Self::Item: IntoFuture,
    <Self::Item as IntoFuture>::Error == Self::Error, 

An adaptor for creating a buffered list of pending futures.

fn buffer_unordered(self, amt: usize) -> BufferUnordered<Self> where
    Self::Item: IntoFuture,
    <Self::Item as IntoFuture>::Error == Self::Error, 

An adaptor for creating a buffered list of pending futures (unordered).

fn merge<S>(self, other: S) -> Merge<Self, S> where
    S: Stream<Error = Self::Error>, 

Deprecated

: functionality provided by select now

An adapter for merging the output of two streams.

fn zip<S>(self, other: S) -> Zip<Self, S> where
    S: Stream<Error = Self::Error>, 

An adapter for zipping two streams together.

fn chain<S>(self, other: S) -> Chain<Self, S> where
    S: Stream<Item = Self::Item, Error = Self::Error>, 

Adapter for chaining two stream.

fn peekable(self) -> Peekable<Self>

Creates a new stream which exposes a peek method.

fn chunks(self, capacity: usize) -> Chunks<Self>

An adaptor for chunking up items of the stream inside a vector.

fn select<S>(self, other: S) -> Select<Self, S> where
    S: Stream<Item = Self::Item, Error = Self::Error>, 

Creates a stream that selects the next element from either this stream or the provided one, whichever is ready first.

fn forward<S>(self, sink: S) -> Forward<Self, S> where
    S: Sink<SinkItem = Self::Item>,
    Self::Error: From<<S as Sink>::SinkError>, 

A future that completes after the given stream has been fully processed into the sink, including flushing.

fn split(self) -> (SplitSink<Self>, SplitStream<Self>) where
    Self: Sink, 

Splits this Stream + Sink object into separate Stream and Sink objects.

fn inspect<F>(self, f: F) -> Inspect<Self, F> where
    F: FnMut(&Self::Item) -> (), 

Do something with each item of this stream, afterwards passing it on.