# Sol — Developer Context

## Build & Test

```sh
cargo build --release                              # debug: cargo build
cargo test                                         # unit tests, no external services needed
cargo build --release --target x86_64-unknown-linux-gnu  # cross-compile for production
```

Integration tests (require `.env` with `SOL_MISTRAL_API_KEY`):

```sh
cargo test --test integration_test
```

Docker (multi-stage, vendored deps):

```sh
docker build -t sol .
```

Production build + deploy via sunbeam CLI:

```sh
sunbeam build sol --push --deploy
```

## Private Cargo Registry

`mistralai-client` is published to Sunbeam's private Gitea cargo registry at `src.sunbeam.pt`. The crate is vendored into `vendor/` for Docker builds. Registry config lives in `.cargo/config.toml` (not checked in — generated by Dockerfile and locally via `cargo vendor vendor/`).

## Vendor Workflow

After adding/updating deps:

```sh
cargo vendor vendor/
```

This updates the vendored sources. Commit `vendor/` changes alongside `Cargo.lock`.

## Key Architecture Notes

- **`chat_blocking()` workaround**: The Mistral client's `chat_async` holds a `std::sync::MutexGuard` across `.await`, making the future `!Send`. All chat calls use `chat_blocking()` which runs `client.chat()` via `tokio::task::spawn_blocking`.
- **Transport-agnostic orchestrator**: The `orchestrator` module emits `OrchestratorEvent`s via broadcast channel. It has no knowledge of Matrix or gRPC. Transport bridges subscribe to events and translate to their protocol.
- **Two input paths**: Matrix sync loop and gRPC `CodeAgent` service. Both feed `GenerateRequest` into the orchestrator.
- **Tool dispatch routing**: `ToolSide::Server` tools execute locally in Sol. `ToolSide::Client` tools are relayed to the gRPC client (sunbeam code TUI) via oneshot channels.
- **Conversations API**: `ConversationRegistry` with persistent state (SQLite-backed), agents, function call loop. Enabled via `agents.use_conversations_api`.
- **deno_core sandbox**: `run_script` tool spins up a fresh V8 isolate per invocation with `sol.*` host API bindings. Timeout via V8 isolate termination. Output truncated to 4096 chars.
- **Code indexing**: Tree-sitter symbol extraction (Rust, Python, TypeScript, Go, Java) from Gitea repos and `sunbeam code` IndexSymbols. Stored in OpenSearch `sol_code` index.

## K8s Context

- Namespace: `matrix`
- Deployment: `sol` (Recreate strategy — single replica, SQLite can't share)
- PVC: `sol-data` (1Gi RWO) mounted at `/data` — holds `sol.db` + `matrix-state/`
- ConfigMap: `sol-config` — `sol.toml` + `system_prompt.md` (subPath mounts)
- Secrets: `sol-secrets` via VaultStaticSecret from OpenBao `secret/sol` (5 keys: `matrix-access-token`, `matrix-device-id`, `mistral-api-key`, `gitea-admin-username`, `gitea-admin-password`)
- Vault auth: Sol authenticates to OpenBao via K8s auth (role `sol-agent`, policy `sol-agent`) for storing user impersonation tokens at `secret/sol-tokens/{localpart}/{service}`
- Build target: `x86_64-unknown-linux-gnu` (Scaleway amd64 server)
- Base image: `gcr.io/distroless/cc-debian12:nonroot`

## Source Layout

- `src/main.rs` — startup, component wiring, gRPC server, backfill, agent recreation + sneeze
- `src/sync.rs` — Matrix event handlers, context hint injection for new conversations
- `src/config.rs` — TOML config with serde defaults (8 sections: matrix, opensearch, mistral, behavior, agents, services, vault, grpc)
- `src/context.rs` — `ResponseContext`, `derive_user_id`, `localpart`
- `src/conversations.rs` — `ConversationRegistry` (room→conversation mapping, SQLite-backed, reset_all)
- `src/persistence.rs` — SQLite store (WAL mode, 3 tables: `conversations`, `agents`, `service_users`)
- `src/matrix_utils.rs` — message extraction, reply/edit/thread detection, image download
- `src/time_context.rs` — time utilities
- `src/tokenizer.rs` — token counting
- `src/orchestrator/` — transport-agnostic event-driven pipeline (engine, events, tool dispatch)
- `src/grpc/` — gRPC CodeAgent service (server, session, auth, bridge to orchestrator events)
- `src/brain/` — evaluator (engagement decision), responder (response generation), personality, conversation manager
- `src/agents/` — registry (instructions hash + automatic recreation), definitions (orchestrator + domain agents)
- `src/sdk/` — vault client (K8s auth), token store (Vault-backed), gitea client (PAT auto-provisioning), kratos client
- `src/memory/` — schema, store, extractor
- `src/tools/` — registry + dispatch, search, code_search, room_history, room_info, script, devtools (gitea), identity (kratos), web_search (searxng), research (parallel micro-agents), bridge
- `src/code_index/` — schema, gitea repo walker, tree-sitter symbol extraction, OpenSearch indexer
- `src/breadcrumbs/` — adaptive code context injection (project outline + hybrid search)
- `src/archive/` — schema, indexer
- `proto/code.proto` — gRPC service definition (CodeAgent: Session + ReindexCode)