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@moecorp/moelog-sidecar

v0.0.2-alpha.1

Published

El canal sidecar de MoeLog: protocolo, transporte, daemon y CLI. Compartido por todos los SDK de servidor.

Vulnerabilities

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Links

Git

Maintainers

sebastian_asprinosebastian_asprino

Keywords

observabilityloggingerrorsmonitoringsidecarmoelog

Readme

@moecorp/moelog-sidecar

The sidecar channel of MoeLog: protocol, transport, daemon and CLI.

Do not install this directly. It comes as a dependency of @moecorp/moelog-node and @moecorp/moelog-bun.

What it is

It holds both ends of the channel: the client the SDK uses and the process that listens.

Your app does no networking. It writes NDJSON to a unix socket and returns. A separate process — launched detached, outliving the app — persists, retries and forwards to the server.

That is what makes it possible to report three things no in-process SDK can:

  • that the app died from a SIGKILL or a kernel OOM (reporting it would require being alive),
  • that its event loop is blocked (reporting it would require the very loop that is blocked),
  • that the app never even started.

Measured with the server switched off: emitting five errors cost the app 0.62 ms, and all five arrived on their own once it reconnected.

CLI

Installing either SDK makes the moelog binary available:

moelog run -- bun run index.ts   # supervise: the only way to see "it never started"
moelog status                    # sidecar status and upstream queue
moelog tail -n 20                # latest events
moelog alerts -n 20              # crashes, blocks, failed startups
moelog stop

The sidecar is one single process, shared by every runtime: it owns a socket, and two different versions fighting over it would be an expensive bug to debug.

License

AGPL-3.0-only.

Note that this SDK is imported into your application, so the AGPL's copyleft reaches further here than it would for a server-only project. If that is a problem for your use case, open an issue: a permissive license for the SDKs with AGPL kept for the server is under consideration.