198 lines
5.7 KiB
Markdown
198 lines
5.7 KiB
Markdown
# Multi-Project
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[← Docs index](./README.md)
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Fusion can coordinate multiple repositories from one installation, with shared visibility and global concurrency control.
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## Why Use Multi-Project Mode?
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Use multi-project mode when you need to:
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- Operate many repos from one dashboard/CLI
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- Standardize settings and workflows across projects
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- Monitor global activity and system-wide execution capacity
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## Central Database Architecture
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Multi-project metadata is stored in:
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`~/.fusion/fusion-central.db`
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Core tables:
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- `projects`
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- `projectHealth`
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- `centralActivityLog`
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- `globalConcurrency`
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- `nodes`
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- `peerNodes`
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- `settingsSyncState`
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- `__meta`
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Per-project task data remains in each repo’s `.fusion/fusion.db`.
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Peer/mesh coordination spans core + engine:
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- `NodeDiscovery` and `NodeConnection` in `@fusion/core` handle discovery and remote node connectivity/auth.
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- `PeerExchangeService` in `@fusion/engine` coordinates node-to-node sync/exchange workflows.
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## Registering and Managing Projects
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```bash
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fn project add my-app /path/to/app
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fn project list
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fn project show my-app
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fn project set-default my-app
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fn project detect
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fn project remove my-app --force
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```
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## `--project` Flag and Resolution
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You can target a project explicitly:
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```bash
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fn task list --project my-app
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fn task create "Fix oauth callback" --project my-app
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```
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Resolution order without `--project`:
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1. explicit flag
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2. default project
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3. current-directory auto-detection
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## Project Health Tracking
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Central health tracking keeps mutable project metrics, including:
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- active task counts
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- in-flight agent counts
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- project status (`initializing`, `active`, `paused`, `errored`)
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## Global Concurrency Management
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A singleton central record enforces system-wide limits so one project cannot monopolize all execution slots.
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## Isolation Modes
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Projects can run with:
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- **`in-process`** (default): low overhead, shared process
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- **`child-process`**: stronger isolation with independent process boundary
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## Node Routing
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Multi-project deployments use two related node fields at different layers:
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1. **Project runtime placement** (`projects.nodeId` in `~/.fusion/fusion-central.db`)
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- Decides where a project runtime is hosted in multi-project orchestration.
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2. **Task dispatch default** (`defaultNodeId` in project settings)
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- Decides where tasks route when they do not have a per-task override.
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These fields are intentionally distinct.
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### Runtime placement (`projects.nodeId`)
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`ProjectManager` uses project registration data plus isolation mode to pick runtime type:
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- `isolationMode: "child-process"` → always `ChildProcessRuntime`
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- `isolationMode: "in-process"` + remote `projects.nodeId` → `RemoteNodeRuntime`
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- `isolationMode: "in-process"` + local/unset/missing node assignment → `InProcessRuntime`
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So `projects.nodeId` is a **project host-node assignment**, not a per-task override.
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### Task routing defaults (`defaultNodeId` + `Task.nodeId`)
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Within a project runtime, effective task routing resolves as:
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1. task override (`Task.nodeId`)
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2. project default (`defaultNodeId`)
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3. local execution
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This allows each project to maintain independent routing behavior even when managed from one central registry.
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### Unavailable node policy in multi-project context
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`unavailableNodePolicy` is project-scoped and can be set differently per project (`block` or `fallback-local`).
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Current behavior: scheduler dispatch records effective node/source for each task, but health-based block/fallback enforcement is not yet applied in the scheduler dispatch path.
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### Example: different node defaults per project
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- **Project A** (`projects.nodeId` assigned to remote host): runtime executes via `RemoteNodeRuntime`; `defaultNodeId=edge-a` routes unpinned tasks to edge-a.
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- **Project B** (`projects.nodeId` unset): runtime stays local `InProcessRuntime`; `defaultNodeId=edge-b` still marks its task dispatch default independently.
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See also:
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- [Settings Reference → Node Routing settings](./settings-reference.md#node-routing-settings-project-scope)
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- [Task Management → Node Routing](./task-management.md#node-routing)
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- [Architecture → Task Routing Architecture](./architecture.md#task-routing-architecture)
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## Auto-Migration from Single-Project
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On first run after upgrade:
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- Existing project databases are detected
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- Projects are registered into central DB automatically
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- Existing single-project workflows continue working
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Migration is idempotent and designed to avoid repeated re-registration.
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## Rollback Procedure
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If central registry behavior needs to be reverted:
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1. Delete `~/.fusion/fusion-central.db`
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2. Keep using per-project `.fusion/fusion.db` data
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3. Fusion falls back to legacy/single-project behavior
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4. Re-register projects later with `fn init` / `fn project add`
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## Runtime Architecture
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### ProjectRuntime interface
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Each project runtime supports start/stop/status/metrics and access to scheduler/task store (for in-process mode).
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### HybridExecutor
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HybridExecutor orchestrates all project runtimes and forwards project-attributed events.
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### IPC Protocol (child-process mode)
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Host → worker commands include:
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- `START_RUNTIME`
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- `STOP_RUNTIME`
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- `GET_STATUS`
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- `GET_METRICS`
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- `GET_TASK_STORE`
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- `GET_SCHEDULER`
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- `PING`
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Worker → host events include:
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- `TASK_CREATED`
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- `TASK_MOVED`
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- `TASK_UPDATED`
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- `ERROR_EVENT`
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- `HEALTH_CHANGED`
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## HybridExecutor Diagram
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```mermaid
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flowchart TD
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HE[HybridExecutor]
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PM[Project Manager]
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CC[CentralCore]
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HE --> PM
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HE --> CC
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PM --> A[Project A Runtime\n(in-process)]
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PM --> B[Project B Runtime\n(child-process)]
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PM --> C[Project C Runtime\n(in-process)]
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B --> IPC[IPC Worker Channel]
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```
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See also: [Architecture](./architecture.md), [CLI Reference](./cli-reference.md), and [Missions](./missions.md).
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