summaryrefslogtreecommitdiffstats
path: root/vendor/h2/src/lib.rs
blob: 83014711388b88b751529d10c95f6c6c5025cc18 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
//! An asynchronous, HTTP/2 server and client implementation.
//!
//! This library implements the [HTTP/2] specification. The implementation is
//! asynchronous, using [futures] as the basis for the API. The implementation
//! is also decoupled from TCP or TLS details. The user must handle ALPN and
//! HTTP/1.1 upgrades themselves.
//!
//! # Getting started
//!
//! Add the following to your `Cargo.toml` file:
//!
//! ```toml
//! [dependencies]
//! h2 = "0.3"
//! ```
//!
//! # Layout
//!
//! The crate is split into [`client`] and [`server`] modules. Types that are
//! common to both clients and servers are located at the root of the crate.
//!
//! See module level documentation for more details on how to use `h2`.
//!
//! # Handshake
//!
//! Both the client and the server require a connection to already be in a state
//! ready to start the HTTP/2 handshake. This library does not provide
//! facilities to do this.
//!
//! There are three ways to reach an appropriate state to start the HTTP/2
//! handshake.
//!
//! * Opening an HTTP/1.1 connection and performing an [upgrade].
//! * Opening a connection with TLS and use ALPN to negotiate the protocol.
//! * Open a connection with prior knowledge, i.e. both the client and the
//!   server assume that the connection is immediately ready to start the
//!   HTTP/2 handshake once opened.
//!
//! Once the connection is ready to start the HTTP/2 handshake, it can be
//! passed to [`server::handshake`] or [`client::handshake`]. At this point, the
//! library will start the handshake process, which consists of:
//!
//! * The client sends the connection preface (a predefined sequence of 24
//! octets).
//! * Both the client and the server sending a SETTINGS frame.
//!
//! See the [Starting HTTP/2] in the specification for more details.
//!
//! # Flow control
//!
//! [Flow control] is a fundamental feature of HTTP/2. The `h2` library
//! exposes flow control to the user.
//!
//! An HTTP/2 client or server may not send unlimited data to the peer. When a
//! stream is initiated, both the client and the server are provided with an
//! initial window size for that stream.  A window size is the number of bytes
//! the endpoint can send to the peer. At any point in time, the peer may
//! increase this window size by sending a `WINDOW_UPDATE` frame. Once a client
//! or server has sent data filling the window for a stream, no further data may
//! be sent on that stream until the peer increases the window.
//!
//! There is also a **connection level** window governing data sent across all
//! streams.
//!
//! Managing flow control for inbound data is done through [`FlowControl`].
//! Managing flow control for outbound data is done through [`SendStream`]. See
//! the struct level documentation for those two types for more details.
//!
//! [HTTP/2]: https://http2.github.io/
//! [futures]: https://docs.rs/futures/
//! [`client`]: client/index.html
//! [`server`]: server/index.html
//! [Flow control]: http://httpwg.org/specs/rfc7540.html#FlowControl
//! [`FlowControl`]: struct.FlowControl.html
//! [`SendStream`]: struct.SendStream.html
//! [Starting HTTP/2]: http://httpwg.org/specs/rfc7540.html#starting
//! [upgrade]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism
//! [`server::handshake`]: server/fn.handshake.html
//! [`client::handshake`]: client/fn.handshake.html

#![doc(html_root_url = "https://docs.rs/h2/0.3.19")]
#![deny(missing_debug_implementations, missing_docs)]
#![cfg_attr(test, deny(warnings))]
#![allow(clippy::type_complexity, clippy::manual_range_contains)]

macro_rules! proto_err {
    (conn: $($msg:tt)+) => {
        tracing::debug!("connection error PROTOCOL_ERROR -- {};", format_args!($($msg)+))
    };
    (stream: $($msg:tt)+) => {
        tracing::debug!("stream error PROTOCOL_ERROR -- {};", format_args!($($msg)+))
    };
}

macro_rules! ready {
    ($e:expr) => {
        match $e {
            ::std::task::Poll::Ready(r) => r,
            ::std::task::Poll::Pending => return ::std::task::Poll::Pending,
        }
    };
}

#[cfg_attr(feature = "unstable", allow(missing_docs))]
mod codec;
mod error;
mod hpack;

#[cfg(not(feature = "unstable"))]
mod proto;

#[cfg(feature = "unstable")]
#[allow(missing_docs)]
pub mod proto;

#[cfg(not(feature = "unstable"))]
mod frame;

#[cfg(feature = "unstable")]
#[allow(missing_docs)]
pub mod frame;

pub mod client;
pub mod ext;
pub mod server;
mod share;

#[cfg(fuzzing)]
#[cfg_attr(feature = "unstable", allow(missing_docs))]
pub mod fuzz_bridge;

pub use crate::error::{Error, Reason};
pub use crate::share::{FlowControl, Ping, PingPong, Pong, RecvStream, SendStream, StreamId};

#[cfg(feature = "unstable")]
pub use codec::{Codec, SendError, UserError};