rkik

Developer Guide

This guide describes the project architecture and contribution workflow, we are highly open to any contribution !!

Project Architecture

RKIK is a Rust CLI with a reusable library.

• CLI entrypoint: src/bin/rkik.rs (clap parsing, text/JSON rendering, color control, continuous modes).
• Library: src/lib.rs re-exports the public API and organizes modules:
  • adapters/: DNS resolver and NTP client (rsntp).
  • domain/ntp.rs: Target, ProbeResult (derive Serialize under the json feature).
  • services/query.rs: pub async fn query_one(...) -> Result<ProbeResult, RkikError>.
  • services/compare.rs: pub async fn compare_many(...) -> Result<Vec<ProbeResult>, RkikError> (parallel via futures::join_all).
  • fmt/json.rs, fmt/text.rs: serialization and terminal rendering (not used by the library’s public API).
  • stats/: min/max/avg rollups.
  • sync/ (feature sync): system time application (Unix only).
• Runtime: multi-threaded tokio.

Principles

• No CLI deps in the public API (no clap, console, or process::exit in library functions).
• Errors: thiserror + Result<_, RkikError>.
• Tracing: tracing::instrument on I/O boundaries.

Code Layout

src/
  bin/rkik.rs        # CLI (flags, colors, formats, loops)
  lib.rs             # API re-exports
  adapters/          # DNS + rsntp
  domain/            # domain types (ProbeResult, Target, ...)
  services/          # query_one / compare_many
  fmt/               # text/json output (CLI-side)
  stats/             # Stats
  sync/              # 'sync' feature (Unix)

Async mode

• --compare is asynchronous and runs all queries in parallel via join_all.
• One-shot queries are exposed as async via query_one.
• Timeout is passed as a Duration parameter.

Environment

rustup install stable
rustup default stable
cargo build --release

Tests

• Library (tests/v1_lib.rs) — tokio::test (+ --features network-tests to talk to real NTP servers).
• CLI (tests/v1_cli.rs) — assert_cmd/predicates.
• Lint/format:

  cargo fmt --all -- --check
  cargo clippy --all-targets --all-features -D warnings
  

CI/CD

• Multi-OS test/build workflow (Linux/macOS/Windows): cargo test, fmt, clippy.
• Release: .deb, .rpm, binaries; cargo publish (source-only).

Contribution

1. Fork + feature branch.
2. Preserve the library/CLI split and the async design.
3. Keep cargo fmt and clippy clean.
4. Submit a PR referencing the relevant issue.

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