65 lines
2.6 KiB
Markdown
65 lines
2.6 KiB
Markdown
# Sausage
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You can see how the sausage is made.
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Sausage is a system of actors that you grow by talking to it. Every actor is a
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WASI program (a `.wasm` file) with stdin and stdout. Actors send each other
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newline-delimited JSON messages through a broker. The agent is an actor too:
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it does inference over HTTP, writes new actors, and can change its own code.
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Inspired by [Jiti](https://ghuntley.com/lisp/), but with WASM instead of a
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Lisp image.
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## Quick start
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```sh
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nix develop
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cargo build --release
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export SAUSAGE_API_TOKEN=... # or type it at the prompt
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./target/release/sausage init world --api openai-responses \
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--base-url https://api.example.com --model some-model
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./target/release/sausage run world
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```
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`init` builds the agent (the first build takes a few minutes) and writes its
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configuration to `world/private/agent/data/config.json`. The source contains
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no endpoint and no token.
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In the console:
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```text
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hello → text to the agent
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@notes {"type":"add","text":"milk"} → a JSON message to an actor
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@agent what actors exist? → text to an actor
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/deploy notes examples/notes → build with cargo, then spawn or upgrade
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/list → list actors
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/quit
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```
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## Concepts
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- **Actor**: a `wasi:cli/command` program. It reads messages on stdin and
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writes messages on stdout. Logs go to stderr.
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- **Message**: `{"id", "from", "reply_to"?, "body"}` on stdin;
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`{"to"?, "id"?, "reply_to"?, "body"}` on stdout. No `to` = publish to
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subscribers. There is no request/response: a reply is a new message with
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`reply_to`. Delivery is at most once.
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- **Broker**: routes messages, owns mailboxes, and runs actors. It accepts
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only `.wasm` files: `spawn`, `upgrade`, `rollback`, `stop`, `start`,
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`remove`, `subscribe`, `unsubscribe`, `list`.
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- **cargo**: the built-in Rust compiler actor. `build` a source folder, get a
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`.wasm` path back. Other actors can add other languages.
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- **Filesystem** of each actor:
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- `/data`: private state
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- `/public`: its public files
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- `/actor/<id>/{public,source,status.json,stderr.log}`: every actor, read-only
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A write becomes visible when the writer closes the file (commit on close).
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- **Upgrade**: the broker tests the candidate on a copy of `/data` and
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`/public` (transcripts in `source/tests/*.jsonl`). Then it holds new
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messages, stops the old version, starts the new one, and delivers the held
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messages. A new version that crashes 3 times in 30 seconds is rolled back.
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See [DECISIONS.md](DECISIONS.md) for every design decision and
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[SPIKE.md](SPIKE.md) for the spike results.
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