11 unstable releases (3 breaking)

0.4.3	Jan 11, 2024
0.4.2	Dec 30, 2023
0.4.0	Nov 4, 2023
0.3.2	Oct 9, 2023
0.1.1	Jun 27, 2022

#103 in HTTP server

180 downloads per month
Used in applin

MIT/Apache

205KB
5K SLoC

Servlin

A modular HTTP server library in Rust.

Features

forbid(unsafe_code)
Threaded request handlers:
FnOnce(Request) -> Response + 'static + Clone + Send + Sync
Uses async code internally for excellent performance under load
JSON
Server-Sent Events (SSE)
Saves large request bodies to temp files
Sends 100-Continue
Limits number of threads and connections
Modular: roll your own logging, write custom versions of internal methods, etc.
No macros or complicated type params
Good test coverage (63%)

Limitations

New, not proven in production.
To do:
- Request timeouts
- chunked transfer-encoding for request bodies
- gzip
- brotli
- TLS
- automatically getting TLS certs via ACME
- Drop idle connections when approaching connection limit.
- Denial-of-Service mitigation: source throttling, minimum throughput
- Complete functional test suite
- Missing load tests
- Disk space usage limits

Examples

Complete examples: examples/.

Simple example:

use serde::Deserialize;
use serde_json::json;
use servlin::{
    socket_addr_127_0_0_1,
    Error,
    HttpServerBuilder,
    Request,
    Response
};
use servlin::log::log_request_and_response;
use servlin::reexport::{safina_executor, safina_timer};
use std::sync::Arc;
use temp_dir::TempDir;

struct State {}

fn hello(_state: Arc<State>, req: Request) -> Result<Response, Error> {
    #[derive(Deserialize)]
    struct Input {
        name: String,
    }
    let input: Input = req.json()?;
    Ok(Response::json(200, json!({"message": format!("Hello, {}!", input.name)}))
    .unwrap())
}

fn handle_req(state: Arc<State>, req: Request) -> Result<Response, Error> {
    match (req.method(), req.url().path()) {
        ("GET", "/ping") => Ok(Response::text(200, "ok")),
        ("POST", "/hello") => hello(state, req),
        _ => Ok(Response::text(404, "Not found")),
    }
}

let state = Arc::new(State {});
let request_handler = move |req: Request| {
    log_request_and_response(req, |req| handle_req(state, req)).unwrap()
};
let cache_dir = TempDir::new().unwrap();
safina_timer::start_timer_thread();
let executor = safina_executor::Executor::new(1, 9).unwrap();
executor.block_on(
    HttpServerBuilder::new()
        .listen_addr(socket_addr_127_0_0_1(8271))
        .max_conns(1000)
        .small_body_len(64 * 1024)
        .receive_large_bodies(cache_dir.path())
        .spawn_and_join(request_handler)
).unwrap();

Cargo Geiger Safety Report


Metric output format: x/y
    x = unsafe code used by the build
    y = total unsafe code found in the crate

Symbols: 
    🔒  = No `unsafe` usage found, declares #![forbid(unsafe_code)]
    ❓  = No `unsafe` usage found, missing #![forbid(unsafe_code)]
    ☢️  = `unsafe` usage found

Functions  Expressions  Impls  Traits  Methods  Dependency

0/0        0/0          0/0    0/0     0/0      🔒  servlin 0.4.0
0/0        0/4          0/0    0/0     0/2      ❓  ├── async-fs 1.6.0
0/4        0/230        0/40   0/0     0/12     ❓  │   ├── async-lock 2.8.0
0/0        0/116        0/8    0/0     0/0      ❓  │   │   └── event-listener 2.5.3
0/0        0/28         0/4    0/0     0/0      ❓  │   ├── blocking 1.3.1
0/0        0/0          0/0    0/0     0/0      🔒  │   │   ├── async-channel 1.9.0
0/0        0/168        0/2    0/0     0/1      ❓  │   │   │   ├── concurrent-queue 2.2.0
0/4        0/94         0/16   0/0     0/3      ❓  │   │   │   │   └── crossbeam-utils 0.8.16
0/0        0/0          0/0    0/0     0/0      ❓  │   │   │   │       └── cfg-if 1.0.0
0/0        0/116        0/8    0/0     0/0      ❓  │   │   │   ├── event-listener 2.5.3
0/0        0/37         0/2    0/0     0/0      ❓  │   │   │   └── futures-core 0.3.28
0/4        0/230        0/40   0/0     0/12     ❓  │   │   ├── async-lock 2.8.0
0/1        0/858        0/4    0/0     0/12     ❓  │   │   ├── async-task 4.4.0
0/0        0/33         0/2    0/0     0/0      ❓  │   │   ├── atomic-waker 1.1.1
0/0        0/0          0/0    0/0     0/0      🔒  │   │   ├── fastrand 1.9.0
0/0        0/0          0/0    0/0     0/0      ❓  │   │   ├── futures-lite 1.13.0
0/0        0/0          0/0    0/0     0/0      🔒  │   │   │   ├── fastrand 1.9.0
0/0        0/37         0/2    0/0     0/0      ❓  │   │   │   ├── futures-core 0.3.28
0/0        0/0          0/0    0/0     0/0      ❓  │   │   │   ├── futures-io 0.3.28
0/41       0/2501       0/2    0/0     0/147    ❓  │   │   │   ├── memchr 2.6.3
0/2        0/20         0/1    0/0     0/0      ❓  │   │   │   │   └── log 0.4.20
0/0        0/5          0/0    0/0     0/0      ❓  │   │   │   │       └── serde 1.0.188
0/0        0/0          0/0    0/0     0/0      ❓  │   │   │   │           └── serde_derive 1.0.188
0/0        0/15         0/0    0/0     0/3      ❓  │   │   │   │               ├── proc-macro2 1.0.67
0/0        0/4          0/0    0/0     0/0      ❓  │   │   │   │               │   └── unicode-ident 1.0.12
0/0        0/0          0/0    0/0     0/0      ❓  │   │   │   │               ├── quote 1.0.33
0/0        0/15         0/0    0/0     0/3      ❓  │   │   │   │               │   └── proc-macro2 1.0.67
0/0        0/79         0/3    0/0     0/2      ❓  │   │   │   │               └── syn 2.0.37
0/0        0/15         0/0    0/0     0/3      ❓  │   │   │   │                   ├── proc-macro2 1.0.67
0/0        0/0          0/0    0/0     0/0      ❓  │   │   │   │                   ├── quote 1.0.33
0/0        0/4          0/0    0/0     0/0      ❓  │   │   │   │                   └── unicode-ident 1.0.12
0/0        0/0          0/0    0/0     0/0      🔒  │   │   │   ├── parking 2.1.0
0/0        0/191        0/0    0/0     0/2      ❓  │   │   │   ├── pin-project-lite 0.2.13
0/0        0/21         0/0    0/0     0/4      ❓  │   │   │   └── waker-fn 1.1.0
0/2        0/20         0/1    0/0     0/0      ❓  │   │   └── log 0.4.20
0/0        0/0          0/0    0/0     0/0      ❓  │   └── futures-lite 1.13.0
                                                       │   [build-dependencies]
0/0        0/0          0/0    0/0     0/0      ❓  │   └── autocfg 1.1.0
0/0        0/0          0/0    0/0     0/0      🔒  ├── async-net 1.7.0
                                                       │   [build-dependencies]
0/0        0/0          0/0    0/0     0/0      ❓  │   └── autocfg 1.1.0
0/0        0/4          0/0    0/0     0/0      ❓  │   ├── async-io 1.13.0
0/4        0/230        0/40   0/0     0/12     ❓  │   │   ├── async-lock 2.8.0
0/0        0/0          0/0    0/0     0/0      ❓  │   │   ├── cfg-if 1.0.0
0/0        0/168        0/2    0/0     0/1      ❓  │   │   ├── concurrent-queue 2.2.0
0/0        0/0          0/0    0/0     0/0      ❓  │   │   ├── futures-lite 1.13.0
0/2        0/20         0/1    0/0     0/0      ❓  │   │   ├── log 0.4.20
0/0        0/0          0/0    0/0     0/0      🔒  │   │   ├── parking 2.1.0
0/1        0/250        0/16   0/4     0/5      ❓  │   │   ├── polling 2.8.0
                                                       │   │   │   [build-dependencies]
0/0        0/0          0/0    0/0     0/0      ❓  │   │   │   └── autocfg 1.1.0
0/0        0/0          0/0    0/0     0/0      ❓  │   │   │   ├── cfg-if 1.0.0
0/60       0/502        0/2    0/0     0/50     ❓  │   │   │   ├── libc 0.2.148
0/2        0/20         0/1    0/0     0/0      ❓  │   │   │   └── log 0.4.20
0/371      0/6690       0/2    0/0     0/22     ❓  │   │   ├── rustix 0.37.23
                                                       │   │   │   [build-dependencies]
0/1        0/232        0/2    0/0     0/4      ❓  │   │   │   └── cc 1.0.83
0/60       0/502        0/2    0/0     0/50     ❓  │   │   │       └── libc 0.2.148
0/0        0/0          0/0    0/0     0/0      ❓  │   │   │   ├── bitflags 1.3.2
0/0        0/100        0/0    0/0     0/0      ❓  │   │   │   ├── errno 0.3.3
0/60       0/502        0/2    0/0     0/50     ❓  │   │   │   │   └── libc 0.2.148
0/0        0/666        0/36   0/2     0/14     ❓  │   │   │   ├── io-lifetimes 1.0.11
0/60       0/502        0/2    0/0     0/50     ❓  │   │   │   │   ├── libc 0.2.148
0/6        0/673        0/4    0/0     0/4      ❓  │   │   │   │   └── socket2 0.4.9
0/60       0/502        0/2    0/0     0/50     ❓  │   │   │   │       └── libc 0.2.148
0/0        0/7          0/0    0/0     0/0      ❓  │   │   │   ├── itoa 1.0.9
0/60       0/502        0/2    0/0     0/50     ❓  │   │   │   └── libc 0.2.148
0/0        0/24         0/0    0/0     0/3      ❓  │   │   ├── slab 0.4.9
                                                       │   │   │   [build-dependencies]
0/0        0/0          0/0    0/0     0/0      ❓  │   │   │   └── autocfg 1.1.0
0/0        0/5          0/0    0/0     0/0      ❓  │   │   │   └── serde 1.0.188
0/6        0/673        0/4    0/0     0/4      ❓  │   │   ├── socket2 0.4.9
0/0        0/21         0/0    0/0     0/4      ❓  │   │   └── waker-fn 1.1.0
                                                       │   │   [build-dependencies]
0/0        0/0          0/0    0/0     0/0      ❓  │   │   └── autocfg 1.1.0
0/0        0/28         0/4    0/0     0/0      ❓  │   ├── blocking 1.3.1
0/0        0/0          0/0    0/0     0/0      ❓  │   └── futures-lite 1.13.0
0/0        0/0          0/0    0/0     0/0      🔒  ├── fixed-buffer 0.5.0
0/0        0/0          0/0    0/0     0/0      ❓  │   └── futures-io 0.3.28
0/0        0/0          0/0    0/0     0/0      ❓  ├── futures-io 0.3.28
0/0        0/0          0/0    0/0     0/0      ❓  ├── futures-lite 1.13.0
0/0        0/0          0/0    0/0     0/0      ❓  ├── include_dir 0.7.3
0/0        0/0          0/0    0/0     0/0      ❓  │   └── include_dir_macros 0.7.3
0/0        0/15         0/0    0/0     0/3      ❓  │       ├── proc-macro2 1.0.67
0/0        0/0          0/0    0/0     0/0      ❓  │       └── quote 1.0.33
0/0        0/121        0/9    0/0     0/4      ❓  ├── once_cell 1.18.0
0/0        0/0          0/0    0/0     0/0      🔒  ├── permit 0.2.1
0/0        0/32         0/0    0/0     0/0      ❓  ├── rand 0.8.5
0/60       0/502        0/2    0/0     0/50     ❓  │   ├── libc 0.2.148
0/2        0/20         0/1    0/0     0/0      ❓  │   ├── log 0.4.20
0/0        0/0          0/0    0/0     0/0      ❓  │   ├── rand_chacha 0.3.1
0/2        0/712        0/0    0/0     0/25     ❓  │   │   ├── ppv-lite86 0.2.17
0/0        0/2          0/0    0/0     0/0      ❓  │   │   ├── rand_core 0.6.4
0/7        0/228        0/1    0/0     0/3      ❓  │   │   │   ├── getrandom 0.2.10
0/0        0/0          0/0    0/0     0/0      ❓  │   │   │   │   ├── cfg-if 1.0.0
0/60       0/502        0/2    0/0     0/50     ❓  │   │   │   │   └── libc 0.2.148
0/0        0/5          0/0    0/0     0/0      ❓  │   │   │   └── serde 1.0.188
0/0        0/5          0/0    0/0     0/0      ❓  │   │   └── serde 1.0.188
0/0        0/2          0/0    0/0     0/0      ❓  │   ├── rand_core 0.6.4
0/0        0/5          0/0    0/0     0/0      ❓  │   └── serde 1.0.188
0/0        0/0          0/0    0/0     0/0      🔒  ├── safe-regex 0.2.5
0/0        0/0          0/0    0/0     0/0      🔒  │   └── safe-regex-macro 0.2.5
0/0        0/0          0/0    0/0     0/0      🔒  │       ├── safe-proc-macro2 1.0.67
0/0        0/4          0/0    0/0     0/0      ❓  │       │   └── unicode-ident 1.0.12
0/0        0/0          0/0    0/0     0/0      🔒  │       └── safe-regex-compiler 0.2.5
0/0        0/0          0/0    0/0     0/0      🔒  │           ├── safe-proc-macro2 1.0.67
0/0        0/0          0/0    0/0     0/0      🔒  │           └── safe-quote 1.0.15
0/0        0/0          0/0    0/0     0/0      🔒  │               └── safe-proc-macro2 1.0.67
0/0        0/0          0/0    0/0     0/0      🔒  ├── safina-executor 0.3.3
0/0        0/0          0/0    0/0     0/0      🔒  │   ├── safina-sync 0.2.4
0/0        0/0          0/0    0/0     0/0      🔒  │   └── safina-threadpool 0.2.4
0/0        0/0          0/0    0/0     0/0      🔒  ├── safina-sync 0.2.4
0/0        0/0          0/0    0/0     0/0      🔒  ├── safina-timer 0.1.11
0/0        0/121        0/9    0/0     0/4      ❓  │   └── once_cell 1.18.0
0/0        0/5          0/0    0/0     0/0      ❓  ├── serde 1.0.188
0/0        0/7          0/0    0/0     0/0      ❓  ├── serde_json 1.0.107
0/0        0/7          0/0    0/0     0/0      ❓  │   ├── itoa 1.0.9
0/9        0/715        0/0    0/0     0/2      ❓  │   ├── ryu 1.0.15
0/0        0/5          0/0    0/0     0/0      ❓  │   └── serde 1.0.188
0/0        0/0          0/0    0/0     0/0      🔒  ├── serde_urlencoded 0.7.1
0/0        0/2          0/0    0/0     0/0      ❓  │   ├── form_urlencoded 1.2.0
0/0        0/8          0/0    0/0     0/0      ❓  │   │   └── percent-encoding 2.3.0
0/0        0/7          0/0    0/0     0/0      ❓  │   ├── itoa 1.0.9
0/9        0/715        0/0    0/0     0/2      ❓  │   ├── ryu 1.0.15
0/0        0/5          0/0    0/0     0/0      ❓  │   └── serde 1.0.188
0/0        0/0          0/0    0/0     0/0      🔒  ├── temp-dir 0.1.11
0/0        0/0          0/0    0/0     0/0      🔒  ├── temp-file 0.1.7
0/0        0/0          0/0    0/0     0/0      ❓  └── url 2.4.1
0/0        0/2          0/0    0/0     0/0      ❓      ├── form_urlencoded 1.2.0
0/0        0/0          0/0    0/0     0/0      ❓      ├── idna 0.4.0
0/0        0/5          0/0    0/0     0/0      ❓      │   ├── unicode-bidi 0.3.13
0/0        0/5          0/0    0/0     0/0      ❓      │   │   └── serde 1.0.188
0/0        0/20         0/0    0/0     0/0      ❓      │   └── unicode-normalization 0.1.22
0/0        0/0          0/0    0/0     0/0      🔒      │       └── tinyvec 1.6.0
0/0        0/5          0/0    0/0     0/0      ❓      │           ├── serde 1.0.188
0/0        0/0          0/0    0/0     0/0      🔒      │           └── tinyvec_macros 0.1.1
0/0        0/8          0/0    0/0     0/0      ❓      ├── percent-encoding 2.3.0
0/0        0/5          0/0    0/0     0/0      ❓      └── serde 1.0.188

0/509      0/15404      0/156  0/6     0/324

Alternatives

See rust-webserver-comparison.md.

Changelog

v0.4.3 - Implement From<Cow<'_, str>> and From<&Path> for TagValue.
v0.4.2 - Implement Seek for BodyReader.
v0.4.1
- Add Request::opt_json.
- Implement From<LoggerStoppedError> for Error.
v0.4.0
- Changed Response::json to return Result<Response, Error>.
- Changed log_request_and_response to return Result.
- Added Response::unprocessable_entity_422.
v0.3.2 - Fix bug in Response::include_dir redirects.
v0.3.1
- Add Response::redirect_301
- Response::include_dir to redirect from /somedir to /somedir/ so relative URLs will work.
v0.3.0 - Changed Response::include_dir to take &Request and look for index.html in dirs.
v0.2.0
- Added:
  - log_request_and_response and other logging tooling
  - Response::ok_200()
  - Response::unauthorized_401()
  - Response::forbidden_403()
  - Response::internal_server_errror_500()
  - Response::not_implemented_501()
  - Response::service_unavailable_503()
  - EventSender::is_connected()
  - PORT_env()
- Removed print_log_response and RequestBody::length_is_known
- Changed RequestBody::len and is_empty to return Option.
- Bugfixes
v0.1.1 - Add EventSender::unconnected.
v0.1.0 - Rename library to Servlin.

TO DO

Fix limitations above
Support HEAD responses that have Content-Length set and no body.
Add a server-wide limit on upload body size.
Limit disk usage for caching uploads.
Update rust-webserver-comparison.md
- Add missing data
- Add other servers from https://www.arewewebyet.org/topics/frameworks/
- Rearrange
- Generate geiger reports for each web server

License: MIT OR Apache-2.0

Dependencies

~6–18MB
~249K SLoC