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Uses the infrastructure added by #2828 to enable switching
`TcpListener::accept` to use `&self`.
This also switches `poll_accept` to use `&self`. While doing introduces
a hazard, `poll_*` style functions are considered low-level. Most users
will use the `async fn` variants which are more misuse-resistant.
TcpListener::incoming() is temporarily removed as it has the same
problem as `TcpSocket::by_ref()` and will be implemented later.
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Introduces `StreamExt` trait. This trait will be used to add utility functions
to make working with streams easier. This patch includes two functions:
* `next`: a future returning the item in the stream.
* `map`: transform each item in the stream.
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In an effort to reach API stability, the `tokio` crate is shedding its
_public_ dependencies on crates that are either a) do not provide a
stable (1.0+) release with longevity guarantees or b) match the `tokio`
release cadence. Of course, implementing `std` traits fits the
requirements.
The on exception, for now, is the `Stream` trait found in `futures_core`.
It is expected that this trait will not change much and be moved into `std.
Since Tokio is not yet going reaching 1.0, I feel that it is acceptable to maintain
a dependency on this trait given how foundational it is.
Since the `Stream` implementation is optional, types that are logically
streams provide `async fn next_*` functions to obtain the next value.
Avoiding the `next()` name prevents fn conflicts with `StreamExt::next()`.
Additionally, some misc cleanup is also done:
- `tokio::io::io` -> `tokio::io::util`.
- `delay` -> `delay_until`.
- `Timeout::new` -> `timeout(...)`.
- `signal::ctrl_c()` returns a future instead of a stream.
- `{tcp,unix}::Incoming` is removed (due to lack of `Stream` trait).
- `time::Throttle` is removed (due to lack of `Stream` trait).
- Fix: `mpsc::UnboundedSender::send(&self)` (no more conflict with `Sink` fns).
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Related to #1318, Tokio APIs that are "less stable" are moved into a new
`tokio-util` crate. This crate will mirror `tokio` and provide
additional APIs that may require a greater rate of breaking changes.
As examples require `tokio-util`, they are moved into a separate
crate (`examples`). This has the added advantage of being able to avoid
example only dependencies in the `tokio` crate.
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* chore: Fix examples not working with `cargo run`
## Motivation
PR #991 moved the `tokio` crate to its own subdirectory, but did not
move the `examples` directory into `tokio/examples`. While attempting to
use the examples for testing another change, I noticed that #991 had
broken the ability to use `cargo run`, as the examples were no longer
considered part of a crate that cargo was aware of:
```
tokio on master [$] via 🦀v1.33.0 at ☸️ aks-eliza-dev
➜ cargo run --example chat
error: no example target named `chat`
Did you mean `echo`?
```
## Solution
This branch moves the examples into the `tokio` directory, so cargo is
now once again aware of them:
```
tokio on eliza/fix-examples [$] via 🦀v1.33.0 at ☸️ aks-eliza-dev
➜ cargo run --example chat
Compiling tokio-executor v0.1.7 (/Users/eliza/Code/tokio/tokio-executor)
Compiling tokio-reactor v0.1.9
Compiling tokio-threadpool v0.1.13
Compiling tokio-current-thread v0.1.6
Compiling tokio-timer v0.2.10
Compiling tokio-uds v0.2.5
Compiling tokio-udp v0.1.3
Compiling tokio-tcp v0.1.3
Compiling tokio-fs v0.1.6
Compiling tokio v0.1.18 (/Users/eliza/Code/tokio/tokio)
Finished dev [unoptimized + debuginfo] target(s) in 7.04s
Running `target/debug/examples/chat`
server running on localhost:6142
```
Signed-off-by: Eliza Weisman <eliza@buoyant.io>
Signed-off-by: Eliza Weisman <eliza@buoyant.io>
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Create a new tokio-codec crate with many of the contents of
`tokio_io::codec`.
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