Constant USAGE

pub(crate) const USAGE: &str = "\
OA-Gateway bench — latency and throughput against public gateway APIs

Usage:
  oa-gateway-bench engine   [options]
  oa-gateway-bench loopback [options]
  oa-gateway-bench owp      [options]
  oa-gateway-bench uci      [options]
  oa-gateway-bench ping     [options]

Shared options:
  --duration DUR       How long to publish (default 10s). 200ms, 10s, 1m, or seconds.
  --warmup DUR         Discard latency samples sent in this prefix of --duration (default 1s).
  --rate N             Publishes per second. 0 means as-fast-as-possible (default 0).
  --payload-bytes N    Minimum JSON payload size (default 64).
  --json PATH          Write the same numbers as one JSON object.
  -h, --help           Print this help and exit.

engine options:
  --subscribers N      How many engine subscribers (default 1).
  --capacity N         Delivery channel size passed to Engine::subscribe (default 4096).

owp options:
  --publishers N       WebSocket publishers (default 1).
  --subscribers N      WebSocket subscribers (default 1).
  --xml-baseline       Embedded OWP converts OMS JSON ↔ UCI XML (fixture schema).
  --url URL            Attach to a running gateway instead of starting OWP.
  --ack-latency        Also time PUB → +OK on the publisher socket.

uci options:
  --iterations N       Convert this many times (default 2000).
  --direction DIR      json-to-xml (default) or xml-to-json.

ping options:
  --url URL            Attach to a running gateway instead of starting OWP.

Examples:
  oa-gateway-bench engine --duration 5s --warmup 1s
  oa-gateway-bench engine --capacity 64
  oa-gateway-bench owp --xml-baseline --duration 5s
  oa-gateway-bench owp --url ws://127.0.0.1:9000/
  oa-gateway-bench uci --iterations 2000
  oa-gateway-bench ping --url ws://127.0.0.1:9000/
";

Operator-facing usage text for -h / --help.