celerix-store

celerix-store is a lightweight, low-latency Key-Value (KV) data store designed for the Celerix suite of applications. It provides a "Liquid Data" experience, allowing applications to seamlessly transition between local-first embedded storage and a networked, shared service without changing application logic.

What it does

• Unified State Management: Stores configuration and state at the Persona -> App -> Key level.
• Dual-Mode Operation: Works as an embedded Go library (zero-dependency) or a standalone TLS-encrypted daemon.
• Transparent Discovery: The SDK automatically detects whether to run locally or connect to a remote server.
• End-to-End Security: Includes a "Vault" layer for client-side AES-GCM encryption and automatic TLS for network traffic.
• Thread-Safe & Crash-Resilient: Uses deep-copy persistence and atomic file renames to ensure data integrity.
• Advanced Querying: Supports cross-persona moves, global indexing, and batch app dumps.

Architecture: In-Memory with File-System Sync

celerix-store is an in-memory first data store.

• Performance: All read operations are served directly from RAM, providing microsecond latency.
• Persistence: Every write operation is synchronously applied to the in-memory state and asynchronously flushed to a 1:1 JSON file on disk.
• Reliability: Uses atomic "write-then-rename" operations for the filesystem to prevent data corruption during crashes or power failures.

Documentation

• Usage Guide: Detailed guide on library usage, patterns, and best practices.

Installation

go get github.com/celerix-dev/celerix-store

Data Hierarchy

Data is organized in a three-tier hierarchy:

1. Persona: The top-level owner (e.g., a user or system identity). Data is persisted in persona.json files.
2. App: A namespace for a specific application or service.
3. Key: The specific configuration or state key.

Usage Modes

1. Embedded Mode (Library)

Best for local-first applications or when running without infrastructure. Data is stored in local JSON files.

import "github.com/celerix-dev/celerix-store/pkg/sdk"

func main() {
    // If CELERIX_STORE_ADDR is NOT set, it defaults to Embedded mode.
    store, _ := sdk.New("./data") 

    // Basic usage
    store.Set("persona1", "my-app", "theme", "dark")
    val, _ := store.Get("persona1", "my-app", "theme")
}

2. Remote Mode (Shared Service)

Multiple services can share state via the celerix-stored daemon.

Deploy with Docker Compose

services:
  celerix-store:
    image: ghcr.io/celerix-dev/celerix-store:latest
    ports: ["7001:7001"]
    volumes: ["./data:/app/data"]

  my-service:
    image: my-service-image
    environment:
      - CELERIX_STORE_ADDR=celerix-store:7001

In your code, sdk.New("./data") will automatically detect the address and connect via TLS.

SDK Advanced Features

App Scopes

Instead of passing IDs every time, use a scope:

app := store.App("persona1", "my-app")
app.Set("volume", 80)

The Vault (Encrypted Storage)

For sensitive data (API keys, tokens), use the Vault scope which performs client-side encryption:

masterKey := []byte("a-very-secret-32-byte-long-key!!") // Must be 32 bytes
vault := app.Vault(masterKey)

// Data is encrypted BEFORE being sent to the store
vault.Set("api_token", "super-secret-value")

// Data is decrypted locally
token, _ := vault.Get("api_token")

Developer Reference

Core Interfaces & Types (pkg/sdk)

Celerix Store follows the Interface Segregation Principle. Use the smallest interface your application needs:

• KVReader: Basic Get operations.
• KVWriter: Set and Delete operations.
• AppEnumeration: Discovering personas and apps.
• BatchExporter: Bulk data retrieval (DumpApp, GetAppStore).
• GlobalSearcher: Finding keys across all personas (GetGlobal).
• Orchestrator: High-level operations (Move).
• CelerixStore: The full composite interface.

The CelerixStore Interface

Any storage implementation (Embedded or Client) satisfies this:

type CelerixStore interface {
    KVReader
    KVWriter
    AppEnumeration
    BatchExporter
    GlobalSearcher
    Orchestrator

    // Scoping
    App(personaID, appID string) AppScope
}

Shared Schemas (pkg/schema)

Common data structures used across the Celerix ecosystem (e.g., UserRecord, AuditLog) are available in pkg/schema to ensure data consistency between different services.

CLI & Tooling

Celerix CLI

go run cmd/celerix/main.go LIST_PERSONAS
go run cmd/celerix/main.go SET mypersona myapp mykey '{"foo": "bar"}'

Standard Tools

TLS is enabled by default. Use openssl for raw testing:

echo "LIST_PERSONAS" | openssl s_client -connect localhost:7001 -quiet

Environment Variables

• CELERIX_STORE_ADDR: Remote daemon address (e.g., localhost:7001). Used by the SDK and CLI.
• CELERIX_PORT: Port the daemon listens on (default: 7001).
• CELERIX_DATA_DIR: Directory where JSON files are stored (default: ./data).
• CELERIX_DISABLE_TLS: Set to true to revert to plain TCP.

License

This project is licensed under the MIT License - see the LICENSE file for details.