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docs: add per package README for implementation details (AI generated with human review)
This commit is contained in:
yusing
@@ -1,378 +1,293 @@
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# Idlewatcher
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Idlewatcher manages container lifecycle based on idle timeout. When a container is idle for a configured duration, it can be automatically stopped, paused, or killed. When a request comes in, the container is woken up automatically.
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Manages container lifecycle based on idle timeout, automatically stopping/pausing containers and waking them on request.
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Idlewatcher also serves a small loading page (HTML + JS + CSS) and an SSE endpoint under [`internal/idlewatcher/types/paths.go`](internal/idlewatcher/types/paths.go:1) (prefixed with `/$godoxy/`) to provide wake events to browsers.
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## Overview
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## Architecture Overview
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The `internal/idlewatcher` package implements idle-based container lifecycle management for GoDoxy. When a container is idle for a configured duration, it can be automatically stopped, paused, or killed. When a request arrives, the container is woken up automatically.
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```mermaid
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graph TB
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subgraph Request Flow
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HTTP[HTTP Request] -->|Intercept| W[Watcher]
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Stream[Stream Request] -->|Intercept| W
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end
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### Primary Consumers
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subgraph Wake Process
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W -->|Wake| Wake[Wake Container]
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Wake -->|Check Status| State[Container State]
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Wake -->|Wait Ready| Health[Health Check]
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Wake -->|Events| SSE[SSE Events]
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end
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- **Route layer**: Routes with idlewatcher config integrate with this package to manage container lifecycle
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- **HTTP handlers**: Serve loading pages and SSE events during wake-up
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- **Stream handlers**: Handle stream connections with idle detection
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subgraph Idle Management
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Timer[Idle Timer] -->|Timeout| Stop[Stop Container]
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State -->|Running| Timer
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State -->|Stopped| Timer
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end
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### Non-goals
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subgraph Providers
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Docker[DockerProvider] --> DockerAPI[Docker API]
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Proxmox[ProxmoxProvider] --> ProxmoxAPI[Proxmox API]
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end
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- Does not implement container runtime operations directly (delegates to providers)
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- Does not manage container dependencies beyond wake ordering
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- Does not provide health checking (delegates to `internal/health/monitor`)
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W -->|Uses| Providers
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### Stability
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Internal package with stable public API. Changes to exported types require backward compatibility.
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## Public API
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### Exported Types
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```go
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// Watcher manages lifecycle of a single container
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type Watcher struct {
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// Embedded route helper for proxy/stream/health
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routeHelper
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cfg *types.IdlewatcherConfig
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// Thread-safe state containers
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provider synk.Value[idlewatcher.Provider]
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state synk.Value[*containerState]
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lastReset synk.Value[time.Time]
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// Timers and channels
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idleTicker *time.Ticker
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healthTicker *time.Ticker
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readyNotifyCh chan struct{}
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// SSE event broadcasting (HTTP routes only)
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eventChs *xsync.Map[chan *WakeEvent, struct{}]
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eventHistory []WakeEvent
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}
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```
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## Directory Structure
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```
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idlewatcher/
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├── debug.go # Debug utilities for watcher inspection
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├── errors.go # Error types and conversion
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├── events.go # Wake event types and broadcasting
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├── handle_http.go # HTTP request handling and loading page
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├── handle_http_debug.go # Debug HTTP handler (!production builds)
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├── handle_stream.go # Stream connection handling
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├── health.go # Health monitor implementation + readiness tracking
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├── loading_page.go # Loading page HTML/CSS/JS templates
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├── state.go # Container state management
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├── watcher.go # Core Watcher implementation
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├── provider/ # Container provider implementations
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│ ├── docker.go # Docker container management
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│ └── proxmox.go # Proxmox LXC management
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├── types/
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│ ├── container_status.go # ContainerStatus enum
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│ ├── paths.go # Loading page + SSE paths
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│ ├── provider.go # Provider interface definition
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│ └── waker.go # Waker interface (http + stream + health)
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└── html/
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├── loading_page.html # Loading page template
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├── style.css # Loading page styles
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└── loading.js # Loading page JavaScript
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```go
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// WakeEvent is broadcast via SSE during wake-up
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type WakeEvent struct {
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Type WakeEventType
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Message string
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Timestamp time.Time
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Error string
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}
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```
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## Core Components
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### Exported Functions/Methods
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### Watcher
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```go
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// NewWatcher creates or reuses a watcher for the given route and config
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func NewWatcher(parent task.Parent, r types.Route, cfg *types.IdlewatcherConfig) (*Watcher, error)
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The main component that manages a single container's lifecycle:
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// Wake wakes the container, blocking until ready
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func (w *Watcher) Wake(ctx context.Context) error
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// Start begins the idle watcher loop
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func (w *Watcher) Start(parent task.Parent) gperr.Error
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// ServeHTTP serves the loading page and SSE events
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func (w *Watcher) ServeHTTP(rw http.ResponseWriter, r *http.Request)
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// ListenAndServe handles stream connections with idle detection
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func (w *Watcher) ListenAndServe(ctx context.Context, preDial, onRead nettypes.HookFunc)
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// Key returns the unique key for this watcher
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func (w *Watcher) Key() string
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```
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### Package-level Variables
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```go
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var (
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// watcherMap is a global registry keyed by config.Key()
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watcherMap map[string]*Watcher
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watcherMapMu sync.RWMutex
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// singleFlight prevents duplicate wake calls for the same container
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singleFlight singleflight.Group
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)
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```
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## Architecture
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### Core Components
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```mermaid
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classDiagram
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class Watcher {
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+string Key() string
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+Wake(ctx context.Context) error
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+Start(parent task.Parent) gperr.Error
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+ServeHTTP(rw ResponseWriter, r *Request)
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+ListenAndServe(ctx context.Context, predial, onRead HookFunc)
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-idleTicker: *time.Ticker
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-healthTicker: *time.Ticker
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-state: synk.Value~*containerState~
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-provider: synk.Value~Provider~
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-readyNotifyCh: chan struct{}
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-eventChs: *xsync.Map~chan *WakeEvent, struct{}~
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-eventHistory: []WakeEvent
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-dependsOn: []*dependency
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+Wake(ctx) error
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+Start(parent) gperr.Error
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+ServeHTTP(ResponseWriter, *Request)
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+ListenAndServe(ctx, preDial, onRead)
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+Key() string
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}
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class containerState {
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+status: ContainerStatus
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+ready: bool
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+err: error
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+startedAt: time.Time
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+healthTries: int
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status ContainerStatus
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ready bool
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err error
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startedAt time.Time
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healthTries int
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}
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class dependency {
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+*Watcher
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+waitHealthy: bool
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class idlewatcher.Provider {
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<<interface>>
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+ContainerPause(ctx) error
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+ContainerStart(ctx) error
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+ContainerStop(ctx, signal, timeout) error
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+ContainerStatus(ctx) (ContainerStatus, error)
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+Watch(ctx) (eventCh, errCh)
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}
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Watcher --> containerState : manages
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Watcher --> dependency : depends on
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Watcher --> idlewatcher.Provider : uses
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```
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Package-level helpers:
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- `watcherMap` is a global registry of watchers keyed by [`types.IdlewatcherConfig.Key()`](internal/types/idlewatcher.go:60), guarded by `watcherMapMu`.
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- `singleFlight` is a global `singleflight.Group` keyed by container name to prevent duplicate wake calls.
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### Provider Interface
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Abstraction for different container backends:
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### Component Interactions
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```mermaid
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classDiagram
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class Provider {
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<<interface>>
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+ContainerPause(ctx) error
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+ContainerUnpause(ctx) error
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+ContainerStart(ctx) error
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+ContainerStop(ctx, signal, timeout) error
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+ContainerKill(ctx, signal) error
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+ContainerStatus(ctx) (ContainerStatus, error)
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+Watch(ctx) (eventCh, errCh)
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+Close()
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}
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class DockerProvider {
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+client: *docker.SharedClient
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+watcher: watcher.DockerWatcher
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+containerID: string
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}
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class ProxmoxProvider {
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+*proxmox.Node
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+vmid: int
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+lxcName: string
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+running: bool
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}
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Provider <|-- DockerProvider
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Provider <|-- ProxmoxProvider
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flowchart TD
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A[HTTP Request] --> B{Container Ready?}
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B -->|Yes| C[Proxy Request]
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B -->|No| D[Wake Container]
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D --> E[SingleFlight Check]
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E --> F[Wake Dependencies]
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F --> G[Start Container]
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G --> H[Health Check]
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H -->|Pass| I[Notify Ready]
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I --> J[SSE Event]
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J --> K[Loading Page]
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K --> L[Retry Request]
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```
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### Container Status
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### State Machine
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```mermaid
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stateDiagram-v2
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[*] --> Napping: status=stopped|paused
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[*] --> Napping: Container stopped/paused
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Napping --> Starting: provider start/unpause event
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Starting --> Ready: health check passes
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Starting --> Error: health check error / startup timeout
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Ready --> Napping: idle timeout (pause/stop/kill)
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Ready --> Error: health check error
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Error --> Napping: provider stop/pause event
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Error --> Starting: provider start/unpause event
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```
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Implementation notes:
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- `Starting` is represented by `containerState{status: running, ready: false, startedAt: non-zero}`.
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- `Ready` is represented by `containerState{status: running, ready: true}`.
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- `Error` is represented by `containerState{status: error, err: non-nil}`.
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- State is updated primarily from provider events in [`(*Watcher).watchUntilDestroy()`](internal/idlewatcher/watcher.go:553) and health checks in [`(*Watcher).checkUpdateState()`](internal/idlewatcher/health.go:104).
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## Lifecycle Flow
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### Wake Flow (HTTP)
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```mermaid
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sequenceDiagram
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participant C as Client
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participant W as Watcher
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participant P as Provider
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participant SSE as SSE (/\$godoxy/wake-events)
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C->>W: HTTP Request
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W->>W: resetIdleTimer()
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Note over W: Handles /favicon.ico and /\$godoxy/* assets first
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alt Container already ready
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W->>C: Reverse-proxy upstream (same request)
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else
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W->>W: Wake() (singleflight + deps)
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alt Non-HTML request OR NoLoadingPage=true
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W->>C: 100 Continue
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W->>W: waitForReady() (readyNotifyCh)
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W->>C: Reverse-proxy upstream (same request)
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else HTML + loading page
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W->>C: Serve loading page (HTML)
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C->>SSE: Connect (EventSource)
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Note over SSE: Streams history + live wake events
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C->>W: Retry original request when WakeEventReady
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end
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end
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```
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### Stream Wake Flow
|
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|
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```mermaid
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sequenceDiagram
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participant C as Client
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participant W as Watcher
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C->>W: Connect to stream
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W->>W: preDial hook
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W->>W: wakeFromStream()
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alt Container ready
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W->>W: Pass through
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else
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W->>W: Wake() (singleflight + deps)
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W->>W: waitStarted() (wait for route to be started)
|
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W->>W: waitForReady() (readyNotifyCh)
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W->>C: Stream connected
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end
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```
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### Idle Timeout Flow
|
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|
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```mermaid
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sequenceDiagram
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participant Client as Client
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participant T as Idle Timer
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participant W as Watcher
|
||||
participant P as Provider
|
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participant D as Dependencies
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|
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loop Every request
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Client->>W: HTTP/Stream
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W->>W: resetIdleTimer()
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end
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|
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T->>W: Timeout
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W->>W: stopByMethod()
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alt stop method = pause
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W->>P: ContainerPause()
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else stop method = stop
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W->>P: ContainerStop(signal, timeout)
|
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else kill method = kill
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||||
W->>P: ContainerKill(signal)
|
||||
end
|
||||
P-->>W: Result
|
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W->>D: Stop dependencies
|
||||
D-->>W: Done
|
||||
```
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|
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## Dependency Management
|
||||
|
||||
Watchers can depend on other containers being started first:
|
||||
|
||||
```mermaid
|
||||
graph LR
|
||||
A[App] -->|depends on| B[Database]
|
||||
A -->|depends on| C[Redis]
|
||||
B -->|depends on| D[Cache]
|
||||
```
|
||||
|
||||
```mermaid
|
||||
sequenceDiagram
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participant A as App Watcher
|
||||
participant B as DB Watcher
|
||||
participant P as Provider
|
||||
|
||||
A->>B: Wake()
|
||||
Note over B: SingleFlight prevents<br/>duplicate wake
|
||||
B->>P: ContainerStart()
|
||||
P-->>B: Started
|
||||
B->>B: Wait healthy
|
||||
B-->>A: Ready
|
||||
A->>P: ContainerStart()
|
||||
P-->>A: Started
|
||||
```
|
||||
|
||||
## Event System
|
||||
|
||||
Wake events are broadcast via Server-Sent Events (SSE):
|
||||
|
||||
```mermaid
|
||||
classDiagram
|
||||
class WakeEvent {
|
||||
+Type: WakeEventType
|
||||
+Message: string
|
||||
+Timestamp: time.Time
|
||||
+Error: string
|
||||
+WriteSSE(w io.Writer) error
|
||||
}
|
||||
|
||||
class WakeEventType {
|
||||
<<enumeration>>
|
||||
WakeEventStarting
|
||||
WakeEventWakingDep
|
||||
WakeEventDepReady
|
||||
WakeEventContainerWoke
|
||||
WakeEventWaitingReady
|
||||
WakeEventReady
|
||||
WakeEventError
|
||||
}
|
||||
|
||||
WakeEvent --> WakeEventType
|
||||
```
|
||||
|
||||
Notes:
|
||||
|
||||
- The SSE endpoint is [`idlewatcher.WakeEventsPath`](internal/idlewatcher/types/paths.go:3).
|
||||
- Each SSE subscriber gets a dedicated buffered channel; the watcher also keeps an in-memory `eventHistory` that is sent to new subscribers first.
|
||||
- `eventHistory` is cleared when the container transitions to napping (stop/pause).
|
||||
|
||||
## State Machine
|
||||
|
||||
```mermaid
|
||||
stateDiagram-v2
|
||||
Napping --> Starting: provider start/unpause event
|
||||
Napping --> Starting: Wake() called
|
||||
Starting --> Ready: Health check passes
|
||||
Starting --> Error: Health check fails / startup timeout
|
||||
Error --> Napping: provider stop/pause event
|
||||
Error --> Starting: provider start/unpause event
|
||||
Starting --> Error: Health check fails / timeout
|
||||
|
||||
Ready --> Napping: Idle timeout
|
||||
Ready --> Napping: Manual stop
|
||||
|
||||
note right of Napping
|
||||
Container is stopped or paused
|
||||
Idle timer stopped
|
||||
end note
|
||||
|
||||
note right of Starting
|
||||
Container is running but not ready
|
||||
Health checking active
|
||||
Events broadcasted
|
||||
end note
|
||||
|
||||
note right of Ready
|
||||
Container healthy
|
||||
Idle timer running
|
||||
end note
|
||||
Error --> Starting: Retry wake
|
||||
Error --> Napping: Container stopped externally
|
||||
```
|
||||
|
||||
## Key Files
|
||||
## Configuration Surface
|
||||
|
||||
| File | Purpose |
|
||||
| --------------------- | ----------------------------------------------------- |
|
||||
| `watcher.go` | Core Watcher implementation with lifecycle management |
|
||||
| `handle_http.go` | HTTP interception and loading page serving |
|
||||
| `handle_stream.go` | Stream connection wake handling |
|
||||
| `provider/docker.go` | Docker container operations |
|
||||
| `provider/proxmox.go` | Proxmox LXC container operations |
|
||||
| `state.go` | Container state transitions |
|
||||
| `events.go` | Event broadcasting via SSE |
|
||||
| `health.go` | Health monitor implementation + readiness tracking |
|
||||
Configuration is defined in `types.IdlewatcherConfig`:
|
||||
|
||||
## Configuration
|
||||
```go
|
||||
type IdlewatcherConfig struct {
|
||||
IdlewatcherConfigBase
|
||||
Docker *types.DockerProviderConfig // Exactly one required
|
||||
Proxmox *types.ProxmoxProviderConfig // Exactly one required
|
||||
}
|
||||
|
||||
See [`types.IdlewatcherConfig`](internal/types/idlewatcher.go:27) for configuration options:
|
||||
type IdlewatcherConfigBase struct {
|
||||
IdleTimeout time.Duration // Duration before container is stopped
|
||||
StopMethod types.ContainerMethod // pause, stop, or kill
|
||||
StopSignal types.ContainerSignal // Signal to send
|
||||
StopTimeout int // Timeout in seconds
|
||||
WakeTimeout time.Duration // Max time to wait for wake
|
||||
DependsOn []string // Container dependencies
|
||||
StartEndpoint string // Optional path restriction
|
||||
NoLoadingPage bool // Skip loading page
|
||||
}
|
||||
```
|
||||
|
||||
- `IdleTimeout`: Duration before container is put to sleep
|
||||
- `StopMethod`: pause, stop, or kill
|
||||
- `StopSignal`: Signal to send when stopping
|
||||
- `StopTimeout`: Timeout for stop operation
|
||||
- `WakeTimeout`: Timeout for wake operation
|
||||
- `DependsOn`: List of dependent containers
|
||||
- `StartEndpoint`: Optional HTTP path restriction for wake requests
|
||||
- `NoLoadingPage`: Skip loading page, wait directly
|
||||
### Docker Labels
|
||||
|
||||
Provider config (exactly one must be set):
|
||||
```yaml
|
||||
labels:
|
||||
proxy.idle_timeout: 5m
|
||||
proxy.idle_stop_method: stop
|
||||
proxy.idle_depends_on: database:redis
|
||||
```
|
||||
|
||||
- `Docker`: container id/name + docker connection info
|
||||
- `Proxmox`: `node` + `vmid`
|
||||
### Path Constants
|
||||
|
||||
## Thread Safety
|
||||
```go
|
||||
const (
|
||||
LoadingPagePath = "/$godoxy/loading"
|
||||
WakeEventsPath = "/$godoxy/wake-events"
|
||||
)
|
||||
```
|
||||
|
||||
- Uses `synk.Value` for atomic state updates
|
||||
- Uses `xsync.Map` for SSE subscriber management
|
||||
- Uses `sync.RWMutex` for watcher map (`watcherMapMu`) and SSE event history (`eventHistoryMu`)
|
||||
- Uses `singleflight.Group` to prevent duplicate wake calls
|
||||
## Dependency and Integration Map
|
||||
|
||||
| Dependency | Purpose |
|
||||
| -------------------------------- | --------------------------- |
|
||||
| `internal/health/monitor` | Health checking during wake |
|
||||
| `internal/route/routes` | Route registry lookup |
|
||||
| `internal/docker` | Docker client connection |
|
||||
| `internal/proxmox` | Proxmox LXC management |
|
||||
| `internal/watcher/events` | Container event watching |
|
||||
| `pkg/gperr` | Error handling |
|
||||
| `xsync/v4` | Concurrent maps |
|
||||
| `golang.org/x/sync/singleflight` | Duplicate wake suppression |
|
||||
|
||||
## Observability
|
||||
|
||||
### Logs
|
||||
|
||||
- **INFO**: Wake start, container started, ready notification
|
||||
- **DEBUG**: State transitions, health check details
|
||||
- **ERROR**: Wake failures, health check errors
|
||||
|
||||
Log context includes: `alias`, `key`, `provider`, `method`
|
||||
|
||||
### Metrics
|
||||
|
||||
No metrics exposed directly; health check metrics available via `internal/health/monitor`.
|
||||
|
||||
## Security Considerations
|
||||
|
||||
- Loading page and SSE endpoints are mounted under `/$godoxy/` path
|
||||
- No authentication on loading page; assumes internal network trust
|
||||
- SSE event history may contain container names (visible to connected clients)
|
||||
|
||||
## Failure Modes and Recovery
|
||||
|
||||
| Failure | Behavior | Recovery |
|
||||
| ----------------------------- | -------------------------------------------------- | ------------------------------ |
|
||||
| Wake timeout | Returns error, container remains in current state | Retry wake with longer timeout |
|
||||
| Health check fails repeatedly | Container marked as error, retries on next request | External fix required |
|
||||
| Provider connection lost | SSE disconnects, next request retries wake | Reconnect on next request |
|
||||
| Dependencies fail to start | Wake fails with dependency error | Fix dependency container |
|
||||
|
||||
## Usage Examples
|
||||
|
||||
### Basic HTTP Route with Idlewatcher
|
||||
|
||||
```go
|
||||
route := &route.Route{
|
||||
Alias: "myapp",
|
||||
Idlewatcher: &types.IdlewatcherConfig{
|
||||
IdlewatcherConfigBase: types.IdlewatcherConfigBase{
|
||||
IdleTimeout: 5 * time.Minute,
|
||||
StopMethod: types.ContainerMethodStop,
|
||||
StopTimeout: 30,
|
||||
},
|
||||
Docker: &types.DockerProviderConfig{
|
||||
ContainerID: "abc123",
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
w, err := idlewatcher.NewWatcher(parent, route, route.Idlewatcher)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return w.Start(parent)
|
||||
```
|
||||
|
||||
### Watching Wake Events
|
||||
|
||||
```go
|
||||
// Events are automatically served at /$godoxy/wake-events
|
||||
// Client connects via EventSource:
|
||||
|
||||
const eventSource = new EventSource("/$godoxy/wake-events");
|
||||
eventSource.onmessage = (e) => {
|
||||
const event = JSON.parse(e.data);
|
||||
console.log(`Wake event: ${event.type}`, event.message);
|
||||
};
|
||||
```
|
||||
|
||||
## Testing Notes
|
||||
|
||||
- Unit tests cover state machine transitions
|
||||
- Integration tests with Docker daemon for provider operations
|
||||
- Mock provider for testing wake flow without real containers
|
||||
|
||||
Reference in New Issue
Block a user