doc(net): added
This commit is contained in:
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5 changed files with 373 additions and 6 deletions
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@ -15,7 +15,7 @@ file system and network operations.
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The Filesystem module offers a clean abstraction over `std::fs`, the standard
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file system operations. For comprehensive documentation and usage examples,
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please refer to the <https://docs.rs/kxio/latest/kxio/fs/>.
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please refer to <https://docs.rs/kxio/latest/kxio/fs/>.
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### Key Filesystem Features:
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66
src/lib.rs
66
src/lib.rs
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@ -1,4 +1,68 @@
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//
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//! # kxio
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//!
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//! `kxio` is a Rust library that provides injectable `FileSystem` and `Network`
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//! resources to enhance the testability of your code. By abstracting system-level
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//! interactions, `kxio` enables easier mocking and testing of code that relies on
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//! file system and network operations.
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//!
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//! ## Features
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//!
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//! - Filesystem Abstraction
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//! - Network Abstraction
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//! - Enhanced Testability
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//!
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//! ## Filesystem
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//!
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//! The Filesystem module offers a clean abstraction over `std::fs`, the standard
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//! file system operations. For comprehensive documentation and usage examples,
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//! please refer to <https://docs.rs/kxio/latest/kxio/fs/>.
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//!
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//! ### Key Filesystem Features:
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//!
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//! - File reading and writing
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//! - Directory operations
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//! - File metadata access
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//! - Fluent API for operations like `.reader().bytes()`
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//!
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//! ## Network
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//!
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//! The Network module offers a testable interface over the `reqwest` crate. For
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//! comprehensive documentation and usage examples, please refer to
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//! <https://docs.rs/kxio/latest/kxio/net/>
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//!
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//! ## Getting Started
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//!
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//! Add `kxio` to your `Cargo.toml`:
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//!
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//! ```toml
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//! [dependencies]
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//! kxio = "x.y.z"
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//! ```
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//!
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//! ## Usage
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//!
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//! See the example [get.rs](https://git.kemitix.net/kemitix/kxio/src/branch/main/examples/get.rs) for an annotated example on how to use the `kxio` library.
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//! It covers both the `net` and `fs` modules.
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//!
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//! ## Development
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//!
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//! - The project uses [Cargo Mutants](https://crates.io/crates/cargo-mutants) for mutation testing.
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//! - [ForgeJo Actions](https://forgejo.org/docs/next/user/actions/) are used for continuous testing and linting.
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//!
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//! ## Contributing
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//!
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//! Contributions are welcome! Please check our [issue tracker](https://git.kemitix.net/kemitix/kxio/issues) for open tasks or
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//! submit your own ideas.
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//!
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//! ## License
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//!
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//! This project is licensed under the terms specified in the `LICENSE` file in the
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//! repository root.
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//!
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//! ---
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//!
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//! For more information, bug reports, or feature requests, please visit our [repository](https://git.kemitix.net/kemitix/kxio).
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pub mod fs;
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pub mod net;
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mod result;
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142
src/net/mod.rs
142
src/net/mod.rs
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@ -149,6 +149,148 @@
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//!
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//! The module uses a custom [Result] type that wraps `core::result::Result` with the custom [Error] enum,
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//! allowing for specific error handling related to network operations.
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//! Provides a testable interface over the [reqwest] crate.
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//!
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//! ## Overview
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//!
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//! The `net` module provides a testable interface for network operations.
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//! It includes implementations for both real network interactions and mocked network operations for testing purposes.
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//!
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//! ## Key methods and types:
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//!
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//! - [kxio::net::new()][new()]: Creates a new `Net` instance
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//! - [kxio::net::mock()][mock()]: Creates a new `MockNet` instance for use in tests
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//! - [Error]: enum for network-related errors
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//! - [Result]: an alias for `core::result::Result<T, Error>`
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//! - [Net]: struct for real and mocked network operations
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//! - [MockNet]: struct for defining behaviours of mocked network operations
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//!
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//! ## Usage
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//!
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//! Write your program to take a reference to [Net].
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//!
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//! Use the [Net::client] functionto create a [reqwest::RequestBuilder] which you should then pass to the [Net::send] method.
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//! This is rather than building the request and calling its own `send` method, doing so would result in the network request being sent, even under-test.
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//!
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//! ```rust
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//! use kxio::net;
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//! async fn get_example(net: &net::Net) -> net::Result<()> {
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//! let response = net.send(net.client().get("https://example.com")).await?;
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//! ///...
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//! Ok(())
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//! }
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//! ```
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//!
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//! ### Real Network Operations
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//!
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//! In your production code you will want to make real network requests.
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//!
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//! Construct a [Net] using [kxio::net::new()][new()]. Then pass as a reference to your program.
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//!
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//! ```rust
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//! use kxio::net;
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//! # #[tokio::main]
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//! # async fn main() -> net::Result<()> {
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//! let net = net::new();
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//!
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//! get_example(&net).await?;
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//! # Ok(())
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//! # }
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//! # async fn get_example(net: &net::Net) -> net::Result<()> {Ok(())}
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//! ```
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//!
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//! ### Mocked Network Operations
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//!
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//! In your tests you will want to mock your network requests and responses.
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//!
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//! Construct a [MockNet] using [kxio::net::mock()][mock()].
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//!
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//! ```rust
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//! use kxio::net;
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//! let mock_net = net::mock();
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//! ```
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//!
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//! Create a [reqwest::Client] using [MockNet::client()].
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//!
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//! ```rust
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//! # let mock_net = kxio::net::mock();
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//! let client = mock_net.client();
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//! // this is the same as:
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//! let client = reqwest::Client::new();
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//! ```
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//!
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//! Define the expected responses for each request, using the [MockNet::on],
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//! that you expect you program to make during the test. You can choose what each request should be
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//! matched against. The default is to the match when both the Method and Url are the same.
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//!
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//! ```rust
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//! use kxio::net;
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//! use kxio::net::MatchOn;
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//!
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//! # #[tokio::main]
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//! # async fn main() -> net::Result<()> {
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//! # let mock_net = net::mock();
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//! # let client = mock_net.client();
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//! mock_net.on(client.get("https://example.com"))
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//! .match_on(vec![
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//! MatchOn::Url,
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//! MatchOn::Method
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//! ])
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//! .respond_with_body(mock_net.response().status(200).body("Mocked response"))?;
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//! # mock_net.reset();
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//! # Ok(())
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//! # }
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//! ```
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//!
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//! All [MatchOn] options:
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//! - [MatchOn::Method] (default)
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//! - [MatchOn::Url] (default)
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//! - [MatchOn::Headers]
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//! - [MatchOn::Body].
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//!
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//! Once you have defined all your expected responses, convert the [MockNet] into a [Net].
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//!
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//! ```rust
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//! # use kxio::net;
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//! # let mock_net = net::mock();
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//! let net: net::Net = mock_net.into();
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//! // or
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//! # let mock_net = net::mock();
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//! let net = net::Net::from(mock_net);
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//! ```
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//!
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//! Now you can pass a reference to `net` to your program.
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//!
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//! ```rust
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//! # use kxio::net;
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//! # #[tokio::main]
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//! # async fn main() -> net::Result<()> {
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//! # let mock_net = net::mock();
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//! # let net = net::Net::from(mock_net);
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//! get_example(&net).await?;
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//! # Ok(())
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//! # }
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//! # async fn get_example(net: &net::Net) -> net::Result<()> {Ok(())}
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//! ```
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//!
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//! When your test is finished, the [MockNet] will check that all the expected requests were
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//! actually made. If there were any missed, then the test will [panic].
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//!
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//! If you don't want this to happen, then call [MockNet::reset] before your test finishes.
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//! You will need to recover the [MockNet] from the [Net].
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//!
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//! ```rust
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//! # use kxio::net;
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//! # let mock_net = net::mock();
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//! # let net = net::Net::from(mock_net);
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//! let mock_net = kxio::net::MockNet::try_from(net).expect("recover mock");
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//! mock_net.reset();
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//! ````
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//!
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//! ## Error Handling
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//!
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//! The module uses a custom [Result] type that wraps `core::result::Result` with the custom [Error] enum,
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//! allowing for specific error handling related to network operations.
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mod result;
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mod system;
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@ -1,15 +1,32 @@
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//
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use derive_more::derive::From;
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/// Represents a error accessing the network.
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/// The Errors that may occur within [kxio::net][crate::net].
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#[derive(Debug, From, derive_more::Display)]
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pub enum Error {
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/// The Errors that may occur when processing a `Request`.
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///
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/// Note: Errors may include the full URL used to make the `Request`. If the URL
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/// contains sensitive information (e.g. an API key as a query parameter), be
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/// sure to remove it ([`without_url`](reqwest::Error::without_url))
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Reqwest(reqwest::Error),
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/// The Errors that may occur when processing a `Request`.
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///
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/// The cause has been converted to a String.
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Request(String),
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/// There was network request that doesn't match any that were expected
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#[display("Unexpected request: {0}", 0.to_string())]
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UnexpectedMockRequest(reqwest::Request),
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/// There was an error accessing the list of expected requests.
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RwLockLocked,
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/// There was an error making a network request.
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Http(http::Error),
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/// Attempted to extract a [MockNet][super::MockNet] from a [Net][super::Net] that does not contain one.
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NetIsNotAMock,
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}
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impl std::error::Error for Error {}
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}
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}
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/// Represents a success or a failure.
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/// Represents a success or a failure within [kxio::net][crate::net].
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///
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/// Any failure is related to `std::io`, a Path Traversal
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/// (i.e. trying to escape the base of the `FileSystem`),
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@ -5,26 +5,41 @@ use reqwest::Client;
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use super::{Error, Result};
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/// Marker trait used to identify whether a [Net] is mocked or not.
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pub trait NetType {}
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/// Marker struct that indicates that a [Net] is a mock.
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#[derive(Debug)]
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pub struct Mocked;
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impl NetType for Mocked {}
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/// Market struct that indicates that a [Net] is not mocked.
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#[derive(Debug)]
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pub struct Unmocked;
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impl NetType for Unmocked {}
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/// A list of planned requests and responses
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type Plans = Vec<Plan>;
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/// The different ways to match a request.
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#[derive(Debug, PartialEq, Eq)]
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pub enum MatchOn {
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/// The request must have a specific HTTP Request Method.
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Method,
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/// The request must have a specific URL.
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Url,
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/// The request must have a specify HTTP Body.
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Body,
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/// The request must have a specific set of HTTP Headers.
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Headers,
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}
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/// A planned request and the response to return
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///
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/// Contains a list of the criteria that a request must meet before being considered a match.
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#[derive(Debug)]
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struct Plan {
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request: reqwest::Request,
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@ -39,7 +54,7 @@ pub struct Net {
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mock: Option<InnerNet<Mocked>>,
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}
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impl Net {
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// constructors
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/// Creates a new unmocked [Net] for creating real network requests.
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pub(super) const fn new() -> Self {
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Self {
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inner: InnerNet::<Unmocked>::new(),
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}
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}
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/// Creats a new [MockNet] for use in tests.
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pub(super) const fn mock() -> MockNet {
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MockNet {
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inner: InnerNet::<Mocked>::new(),
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}
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}
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impl Net {
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// public interface
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/// Helper to create a default [reqwest::Client].
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///
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/// # Example
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///
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/// ```rust
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/// # use kxio::net::Result;
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/// let net = kxio::net::new();
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/// let client = net.client();
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/// let request = client.get("https://hyper.rs");
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/// ```
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pub fn client(&self) -> reqwest::Client {
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Default::default()
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}
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/// Constructs the Request and sends it to the target URL, returning a
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/// future Response.
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///
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/// # Errors
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///
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/// This method fails if there was an error while sending request,
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/// redirect loop was detected or redirect limit was exhausted.
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///
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/// # Example
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///
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/// ```no_run
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/// # use kxio::net::Result;
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/// # async fn run() -> Result<()> {
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/// let net = kxio::net::new();
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/// let request = net.client().get("https://hyper.rs");
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/// let response = net.send(request).await?;
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/// # Ok(())
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/// # }
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/// ```
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pub async fn send(
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&self,
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request: impl Into<reqwest::RequestBuilder>,
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}
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}
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/// A struct for defining the expected requests and their responses that should be made
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/// during a test.
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///
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/// When the [MockNet] goes out of scope it will verify that all expected requests were consumed,
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/// otherwise it will `panic`.
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///
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/// # Example
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///
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/// ```rust
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/// # use kxio::net::Result;
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/// # fn run() -> Result<()> {
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/// let mock_net = kxio::net::mock();
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/// let client = mock_net.client();
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/// // define an expected requet, and the response that should be returned
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/// mock_net.on(client.get("https://hyper.rs"))
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/// .respond_with_body(mock_net.response().status(200).body("Ok"))?;
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/// let net: kxio::net::Net = mock_net.into();
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/// // use 'net' in your program, by passing it as a reference
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///
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/// // In some rare cases you don't want to assert that all expected requests were made.
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/// // You should recover the `MockNet` from the `Net` and `MockNet::reset` it.
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/// let mock_net = kxio::net::MockNet::try_from(net)?;
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/// mock_net.reset(); // only if explicitly needed
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/// # Ok(())
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/// # }
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/// ```
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#[derive(Debug)]
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pub struct MockNet {
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inner: InnerNet<Mocked>,
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}
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impl MockNet {
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/// Helper to create a default [reqwest::Client].
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///
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/// # Example
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///
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/// ```rust
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/// let mock_net = kxio::net::mock();
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/// let client = mock_net.client();
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/// let request = client.get("https://hyper.rs");
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/// ```
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pub fn client(&self) -> Client {
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Default::default()
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}
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/// Specify an expected request.
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///
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/// # Example
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///
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/// ```rust
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/// # use kxio::net::Result;
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/// # fn run() -> Result<()> {
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/// let mock_net = kxio::net::mock();
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/// let client = mock_net.client();
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/// mock_net.on(client.get("https://hyper.rs"))
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/// .respond_with_body(mock_net.response().status(200).body("Ok"))?;
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/// # Ok(())
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/// # }
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/// ```
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pub fn on(&self, request: impl Into<reqwest::RequestBuilder>) -> OnRequest {
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self.inner.on(request)
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}
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/// Creates a [http::response::Builder] to be extended and returned by a mocked network request.
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pub fn response(&self) -> http::response::Builder {
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Default::default()
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}
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/// Constructs the request and matches it against the expected requests.
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///
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/// The first on it finds where it matches against its criteria will be taken ("consumed") and
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/// its response returned.
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///
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/// The order the expected requests are scanned is the order they were declared. As each
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/// expected request is successfully matched against, it is removed and can't be matched
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/// against again.
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pub async fn send(
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&self,
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request: impl Into<reqwest::RequestBuilder>,
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) -> Result<reqwest::Response> {
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self.inner.send(request).await
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}
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/// Clears all the expected requests and responses from the [MockNet].
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///
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/// When the [MockNet] goes out of scope it will assert that all expected requests and
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/// responses were consumed. If there are any left unconsumed, then it will `panic`.
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///
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/// # Example
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///
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/// ```rust
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/// # use kxio::net::Result;
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/// # fn run() -> Result<()> {
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/// # let mock_net = kxio::net::mock();
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/// # let net: kxio::net::Net = mock_net.into();
|
||||
/// let mock_net = kxio::net::MockNet::try_from(net)?;
|
||||
/// mock_net.reset(); // only if explicitly needed
|
||||
/// # Ok(())
|
||||
/// # }
|
||||
/// ```
|
||||
pub fn reset(&self) -> Result<()> {
|
||||
self.inner.reset()
|
||||
}
|
||||
|
@ -124,6 +246,9 @@ impl From<MockNet> for Net {
|
|||
}
|
||||
}
|
||||
|
||||
/// Part of the inner workings of [Net] and [MockNet].
|
||||
///
|
||||
/// Holds the list of expected requests for [MockNet].
|
||||
#[derive(Debug)]
|
||||
pub struct InnerNet<T: NetType> {
|
||||
_type: PhantomData<T>,
|
||||
|
@ -240,6 +365,7 @@ impl<T: NetType> Drop for InnerNet<T> {
|
|||
}
|
||||
}
|
||||
|
||||
/// Intermediate struct used while declaring an expected request and its response.
|
||||
pub enum OnRequest<'net> {
|
||||
Valid {
|
||||
net: &'net InnerNet<Mocked>,
|
||||
|
@ -249,6 +375,14 @@ pub enum OnRequest<'net> {
|
|||
Error(super::Error),
|
||||
}
|
||||
impl<'net> OnRequest<'net> {
|
||||
/// Specify the criteria that a request should be compared against.
|
||||
///
|
||||
/// Given an candidate request, it will be matched against the current request if it has the
|
||||
/// same HTTP Method and Url by default. i.e. if this method is not called.
|
||||
///
|
||||
/// All criteria must be met for the match to be made.
|
||||
///
|
||||
/// Calling this method replaces the default criteria with the new criteria.
|
||||
pub fn match_on(self, match_on: Vec<MatchOn>) -> Self {
|
||||
if let OnRequest::Valid {
|
||||
net,
|
||||
|
@ -265,6 +399,12 @@ impl<'net> OnRequest<'net> {
|
|||
self
|
||||
}
|
||||
}
|
||||
|
||||
/// Constructs the response to be returned when a request matched the criteria.
|
||||
///
|
||||
/// The response will have an empty HTTP Body.
|
||||
///
|
||||
/// Each request and response can only be matched once each.
|
||||
pub fn respond(self, response: impl Into<http::response::Builder>) -> Result<()> {
|
||||
match self {
|
||||
OnRequest::Valid {
|
||||
|
@ -275,6 +415,10 @@ impl<'net> OnRequest<'net> {
|
|||
OnRequest::Error(error) => Err(error),
|
||||
}
|
||||
}
|
||||
|
||||
/// Constructs the response to be returned when a request matched the criteria.
|
||||
///
|
||||
/// Each request and response can only be matched once each.
|
||||
pub fn respond_with_body<T>(
|
||||
self,
|
||||
body_result: std::result::Result<http::Response<T>, http::Error>,
|
||||
|
|
Loading…
Reference in a new issue