feat(cli): run multiple import/export stages over one connection - #2809
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`moq` bridged exactly one broadcast per process, so ingesting two cameras
meant two processes and two connections to the relay. Separate stages with
`--` to bridge several over a single connection and a single Origin:
moq --client-connect https://relay.example.com/anon \
import --broadcast cam1.hang rtmp --listen 0.0.0.0:1935 \
-- import --broadcast cam2.hang rtmp --listen 0.0.0.0:1936
clap can't express a repeated subcommand (a second `import` at the same
level, and an `import` reachable under `rtmp`, which makes the command tree
cyclic and blows the stack when the derive builds it). So `Invocation`
splits argv on `--` before clap sees it: chunk 0 goes to `Cli`, later chunks
to a `no_binary_name` `Stage` parser. Every stage keeps full clap
validation, stage-scoped errors, and its own `--help`.
Stages may run in opposite directions, so one process can ingest and
re-publish without a second connection. That attaches both a publisher and
a subscriber to the same session, which is what a relay already does when
peering; loop prevention is the network's job, since an announcement
carries our origin id as a hop.
`--broadcast` is now also a per-stage flag, falling back to the
process-wide one, so every existing invocation parses unchanged.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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WalkthroughThe CLI now supports multiple import and export stages separated by 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@rs/moq-cli/src/args.rs`:
- Around line 97-114: Update the argument parsing flow around
Cli::try_parse_from and Stage::try_parse_from to detect any empty chunk produced
by a trailing or consecutive “--” before parsing stages, and return a clear
argument error instead of invoking Stage::try_parse_from with an empty chunk.
Preserve normal Cargo separators and non-empty stage parsing behavior.
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doc/bin/cli.mdrs/moq-cli/README.mdrs/moq-cli/src/args.rsrs/moq-cli/src/main.rsrs/moq-native/src/server.rs
…ntrol Review findings from the adversarial pass on #2809. The local (non-Send) pipelines reported completion by sending on a channel after `run()` returned, so a panicking pipeline never reported. Its sender dropped, but a second pipeline still held one, leaving the receiver pending: the process kept running with one broadcast silently gone. Supervise each one through its JoinHandle from the same JoinSet the spawned stages use, so a panic surfaces as an error and completion ends the process either way. Rate control is per-encoder while the bandwidth estimate is per-connection, and each encoder targets 90% of it (rate::Policy::headroom). Two capture stages on one connection therefore aimed at ~180% of the uplink. Refuse the combination until the estimate can be divided among encoders, rather than congesting the link the estimate exists to protect. Server::serve stays private, with a serve_both entry point instead: every public way to serve now attaches at least one direction, so a server that accepts sessions carrying nothing isn't expressible. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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A trailing or doubled `--` left an empty chunk, which reached clap as an empty argv and printed a bare missing-subcommand usage dump carrying the internal `Stage` doc string. Say what's wrong instead. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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`Publish::capture` hands the bandwidth estimate to `video_encode` only when video is enabled, and the audio encoder never reads it. Counting every capture stage therefore refused an invocation that doesn't compete for the estimate at all, like one video capture plus an `import capture --no-video`. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Inline comments:
In `@rs/moq-cli/src/main.rs`:
- Around line 195-222: Update MoqSide::validate to allow --server-tcp-bind and
--server-unix-bind without requiring --server-bind or --client-connect. Change
native server startup to run whenever any native stream listener is configured,
while keeping web::run_web gated by server.bind for its HTTP address.
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- rs/moq-cli/src/args.rs
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clap renders everything past the first line of a struct's doc comment as help body text, so the notes added with the stage parsers showed up under `moq --help` as "The globals plus the first stage. Later stages are [`Stage`]s." Move them to ordinary comments. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Claiming `--` as the stage separator takes it from clap, so it can no longer escape a positional that starts with `-`. The only one it could have escaped is an `import hls` playlist path, which `./-name` covers, so document that rather than making the separator context-sensitive. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Counting only the stages that read the estimate missed the traffic that doesn't. A capture encoder targets a fraction of the connection's estimate, with headroom for its own audio and transport overhead but not for a second publisher, so an RTMP/SRT/HLS/stdin import over the same connection spends what the encoder already claimed. Widen the guard from "one adaptive stage" to "an adaptive stage is the only import"; exports only receive, so they still don't count. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The bandwidth guard ran inside `run_stages`, after `spawn_moq` had already bound QUIC, started the reconnect task, and signalled readiness, so an invocation that was about to be refused still dialed out first. Move it into `Invocation::validate`, which main calls before any of that, keyed on `--client-connect` (which is exactly when an estimate exists). That also puts the rule behind a pure function, so it gets the regression tests it lacked: two video captures, a capture plus a fixed-rate import, an audio-only capture alongside another import, a capture plus exports, and the `--server-bind` equivalents. Verified the table fails when the guard is neutered. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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| // The stage combinations were refused up front by `Invocation::validate`, before | ||
| // anything bound a port or dialed out. | ||
| let bandwidth = spawn_moq(&moq, &net, &origin, Directions::of(&stages), &mut tasks)?; |
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When a stage is rejected by spawn_import or spawn_export, such as import rtc --connect ... --cors-origin ... or an unsupported import --latency-max, this call has already started the reconnect task or synchronously bound the QUIC server socket. These checks previously ran before attaching MoQ, so an invalid command can now briefly contact a relay, occupy a server port, and emit readiness before exiting. Preflight every stage's validation and shared stdin/stdout claims before calling spawn_moq.
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Summary
moqbridged exactly one broadcast per process, so ingesting two cameras meant two processes and two connections to the relay. Stages separated by--now share one connection, one origin id, and one Origin:moq --client-connect https://relay.example.com/anon \ import --broadcast cam1.hang rtmp --listen 0.0.0.0:1935 \ -- import --broadcast cam2.hang rtmp --listen 0.0.0.0:1936clap can't express this grammar: it needs a repeated subcommand at one level and an
importreachable underrtmp, which makes the command tree cyclic. The derive builds that tree eagerly, so it compiles and then overflows the stack.Invocationtherefore splits argv on--before clap sees it, sending chunk 0 toCliand later chunks to ano_binary_nameStageparser. Each stage keeps full validation, stage-scoped errors, and its own--help. Splitting on the literal wordimportinstead would misfire on--broadcast import;--has no such ambiguity, and nothing in moq-cli or moq-native usedtrailing_var_arg/last, so it was free to claim.Stages may run in opposite directions (
import ... -- export ...), so one process can ingest and re-publish without a second connection or a second copy of the media. That attaches a publisher and a subscriber to the same session, which is whatmoq-relay's cluster peering already does; loop prevention stays the network's job, since an announcement carries this process's origin id as a hop.--broadcastis now also a per-stage flag onimport/export, falling back to the process-wide one. Every existing invocation parses unchanged, so no existing doc example broke.What a stage can't do
Refused rather than silently mishandled:
play,transcode,token, anddevicesown the process.--client-connectafter a--is an error, not a silently-ignored flag.import capturewith video) must be the onlyimporton that connection. Rate control targets a fraction of the connection estimate with headroom for its own audio and transport overhead, not for a second publisher, so any other import spends what that encoder already claimed. Exports only receive, so they don't count, and an audio-only--no-videocapture never reads the estimate. Divide the connection bandwidth estimate among concurrent encoders #2815 tracks dividing the estimate so this can be lifted.--takes it from clap as the end-of-options marker. The only positional it could have escaped is animport hlsplaylist path starting with-, so./-playlist.m3u8is documented in--helpand the docs rather than making the separator context-sensitive.Public API changes
moq_native::Server::serve_both(publish, subscribe), the both-directions counterpart ofserve_publish/serve_consume. Additive, so this targetsmain.Server::servestays private, so every public way to serve attaches at least one direction.Invocation/Stage/Command::{name, is_stageable, broadcast}/ImportSource::uses_bandwidthadditions are not a published API.Test plan
just checkandjust testpass (1575 tests).play,capture(the local-pipeline and bandwidth paths are feature-gated).argstests: stage splitting, per-stage vs process-wide--broadcast, root-broadcast default, refusing unstageable verbs, stage-scoped parse errors, globals rejected after--, empty stages from a trailing or doubled--, the./-nameescape, audio-only capture not counting as adaptive, and adebug_asserton the newStagetree.import ... rtmp --listen -- export --broadcast src.hang fmp4produced 19.6s of h264 320x240 + aac that ffprobe decodes, confirming a single session carrying both directions;Review fixes
From the adversarial pass and the bots, each verified against the code first:
run()returned, so a panicking pipeline never reported: its sender dropped, but a second pipeline still held one, leaving the receiver pending while the process ran on with a broadcast silently gone. Now supervised through theirJoinHandlefrom the sameJoinSetthe spawned stages use.uses_bandwidth()to!no_video, sincePublish::captureonly passes the estimate tovideo_encode.servereverted to private withserve_bothadded.--now names the problem instead of dumping a bare missing-subcommand usage; and the stage parsers' doc comments were leaking rustdoc prose (Later stages are [Stage]s.) intomoq --help.Filed rather than fixed here: #2815 (connection-level rate allocation) and #2834 (moq-cli can't run a TCP/UDS-only server, pre-existing on
main).(Written by Opus 5)