rust-okx 0.1.0

Async Rust client for the OKX v5 REST API
Documentation 
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

//! The HTTP transport abstraction.
//!
//! [`Transport`] is intentionally minimal: it knows nothing about OKX
//! authentication, endpoints, or response envelopes. It only sends a fully
//! built [`http::Request`] and returns the raw [`http::Response`]. This keeps
//! custom and mock implementations trivial, and lets cross-cutting concerns
//! (retries, logging, rate limiting) be added as wrapper types instead of new
//! trait methods.
//!
//! The trait uses return-position `impl Future` (no `async_trait`), so calling
//! it incurs no boxing or dynamic dispatch — the [`OkxClient`](crate::OkxClient)
//! is generic over `T: Transport`.

use std::future::Future;

use bytes::Bytes;

#[cfg(feature = "reqwest")]
mod reqwest_impl;
#[cfg(feature = "reqwest")]
pub use reqwest_impl::ReqwestTransport;

/// The default transport type used as the `OkxClient<T>` type parameter.
///
/// When the `reqwest` feature is enabled this is [`ReqwestTransport`]. Otherwise
/// it is a placeholder that does not implement [`Transport`]; you must then
/// supply your own transport via [`OkxClient::with_transport`](crate::OkxClient::with_transport).
#[cfg(feature = "reqwest")]
pub type DefaultTransport = ReqwestTransport;

/// See [`DefaultTransport`].
#[cfg(not(feature = "reqwest"))]
pub type DefaultTransport = UnconfiguredTransport;

/// Placeholder used as the default `OkxClient` transport when no built-in
/// transport feature is enabled. It does not implement [`Transport`].
#[cfg(not(feature = "reqwest"))]
#[derive(Debug, Clone, Copy, Default)]
pub struct UnconfiguredTransport;

/// An opaque transport-layer error.
///
/// The concrete source error (e.g. `reqwest::Error`) is boxed so it does not
/// leak into this crate's public API.
#[derive(Debug, thiserror::Error)]
#[error("{0}")]
pub struct TransportError(Box<dyn std::error::Error + Send + Sync>);

impl TransportError {
    /// Wrap any boxable error as a [`TransportError`].
    pub fn new(error: impl Into<Box<dyn std::error::Error + Send + Sync>>) -> Self {
        Self(error.into())
    }

    /// Create a [`TransportError`] from a message string.
    pub fn message(message: impl Into<String>) -> Self {
        Self(message.into().into())
    }
}

/// Sends HTTP requests on behalf of the client.
///
/// Implementors receive a complete request (URL, method, headers, and body
/// already set, including authentication headers) and return the raw response.
///
/// # Example
///
/// ```
/// use bytes::Bytes;
/// use rust_okx::{Transport, TransportError};
///
/// #[derive(Clone)]
/// struct AlwaysOk;
///
/// impl Transport for AlwaysOk {
///     fn send(
///         &self,
///         _request: http::Request<Bytes>,
///     ) -> impl std::future::Future<Output = Result<http::Response<Bytes>, TransportError>> + Send
///     {
///         async move {
///             Ok(http::Response::builder()
///                 .status(200)
///                 .body(Bytes::from_static(b"{\"code\":\"0\",\"msg\":\"\",\"data\":[]}"))
///                 .unwrap())
///         }
///     }
/// }
/// ```
pub trait Transport: Send + Sync {
    /// Send a request and return the response.
    fn send(
        &self,
        request: http::Request<Bytes>,
    ) -> impl Future<Output = Result<http::Response<Bytes>, TransportError>> + Send;
}