http-body 1.1.0

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4

[[package]]
name = "bytes"
version = "1.12.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fc652a48c352aef3ea3aed32080501cf3ef6ed5da78602a020c991775b0aff04"

[[package]]
name = "http"
version = "1.5.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "918d3568bebf352712bc2ef3d46a8bcf1a75b373be6539de198e9105cbbf9ce0"
dependencies = [
 "bytes",
 "itoa",
]

[[package]]
name = "http-body"
version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ca2a8f2913ee65f60facd6a5905613afaa448497a0230cc41ce022d93290bc2c"
dependencies = [
 "bytes",
 "http",
]

[[package]]
name = "itoa"
version = "1.0.18"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"

[[package]]
name = "sample-http-body"
version = "1.0.0"
dependencies = [
 "http-body",
]

[package]
name = "sample-http-body"
version = "1.0.0"
edition = "2021"
publish = false

[dependencies]
http-body = "=1.1.0"

[[bin]]
name = "contract"
path = "test/contract.rs"

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:cargo/http-body@1.1.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/http-body@1.1.0

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:a345483312a22493333d0588232ed788676f93d795bf3d2c7a8e1676e1888871","contract":["Frame encapsulates body data frames with inspection and transformation capabilities","SizeHint computes lower, upper, and exact bounds and supports addition","Body trait streams data frames and signals completion on String instances","Body trait is implemented for Boxed and mutable reference body wrappers"],"goal":"verify pkg:cargo/http-body@1.1.0","kind":"HOW","packages":["pkg:cargo/http-body@1.1.0"],"schemaVersion":1},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","distro":"alpine","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/http-body@1.1.0"],"schemaVersion":1,"subject":"pkg:cargo/http-body@1.1.0","verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify pkg:cargo/http-body@1.1.0",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/http-body@1.1.0"
  ]
}

//! Clean-room verification sample for http-body.

pub use http_body::*;

use http_body::{Body, Frame, SizeHint};
use std::pin::Pin;
use std::task::{Context, Poll, RawWaker, RawWakerVTable, Waker};

static DUMMY_VTABLE: RawWakerVTable = RawWakerVTable::new(
    |_| RawWaker::new(std::ptr::null(), &DUMMY_VTABLE),
    |_| {},
    |_| {},
    |_| {},
);

fn dummy_context() -> (Waker, Context<'static>) {
    let raw = RawWaker::new(std::ptr::null(), &DUMMY_VTABLE);
    let waker = unsafe { Waker::from_raw(raw) };
    let cx = Context::from_waker(unsafe { &*(&waker as *const Waker) });
    (waker, cx)
}

fn main() {
    let (_waker, mut cx) = dummy_context();

    // 1. Frame encapsulates body data frames with inspection and transformation capabilities
    let data_frame = Frame::data("contract payload");
    assert!(data_frame.is_data());
    assert!(!data_frame.is_trailers());
    assert_eq!(data_frame.data_ref(), Some(&"contract payload"));

    let mapped = data_frame.map_data(|s| s.len());
    assert!(mapped.is_data());
    assert_eq!(mapped.into_data().ok(), Some(16));

    // 2. SizeHint computes lower, upper, and exact bounds and supports addition
    let default_hint = SizeHint::default();
    assert_eq!(default_hint.lower(), 0);
    assert_eq!(default_hint.upper(), None);
    assert_eq!(default_hint.exact(), None);

    let exact_hint = SizeHint::with_exact(1024);
    assert_eq!(exact_hint.lower(), 1024);
    assert_eq!(exact_hint.upper(), Some(1024));
    assert_eq!(exact_hint.exact(), Some(1024));

    let mut range_hint = SizeHint::new();
    range_hint.set_lower(100);
    range_hint.set_upper(500);
    assert_eq!(range_hint.lower(), 100);
    assert_eq!(range_hint.upper(), Some(500));
    assert_eq!(range_hint.exact(), None);

    let sum_hint = exact_hint + range_hint;
    assert_eq!(sum_hint.lower(), 1124);
    assert_eq!(sum_hint.upper(), Some(1524));
    assert_eq!(sum_hint.exact(), None);

    // 3. Body trait streams data frames and signals completion on String instances
    let mut string_body = String::from("stream chunk");
    assert_eq!(string_body.size_hint().exact(), Some(12));
    assert!(!string_body.is_end_stream());

    let first_poll = Pin::new(&mut string_body).poll_frame(&mut cx);
    match first_poll {
        Poll::Ready(Some(Ok(frame))) => {
            assert!(frame.is_data());
            let data = frame.into_data().ok().expect("valid data frame");
            assert_eq!(&data[..], b"stream chunk");
        }
        other => panic!("expected Ready(Some(Ok(frame))), got {:?}", other),
    }

    assert!(string_body.is_end_stream());
    let second_poll = Pin::new(&mut string_body).poll_frame(&mut cx);
    assert!(matches!(second_poll, Poll::Ready(None)));

    // 4. Body trait is implemented for Boxed and mutable reference body wrappers
    let mut boxed_body: Box<String> = Box::new(String::from("boxed payload"));
    assert_eq!(boxed_body.size_hint().exact(), Some(13));
    assert!(!boxed_body.is_end_stream());

    let mut ref_body = &mut boxed_body;
    let poll_ref = Pin::new(&mut ref_body).poll_frame(&mut cx);
    match poll_ref {
        Poll::Ready(Some(Ok(frame))) => {
            assert!(frame.is_data());
            let data = frame.into_data().ok().expect("valid data frame");
            assert_eq!(&data[..], b"boxed payload");
        }
        other => panic!("expected Ready(Some(Ok(frame))), got {:?}", other),
    }
    assert!(ref_body.is_end_stream());

    println!("All http-body contract assertions passed.");
}