extensions/
├── spacedrive-sdk/          # Core SDK library
├── spacedrive-sdk-macros/   # Proc macros for beautiful API
├── test-extension/          # Example extension with beautiful API
└── finance/                 # (Future) First revenue-generating extension

Quick Start

1. Install WASM Target

rustup target add wasm32-unknown-unknown

2. Create Extension

cargo new --lib my-extension
cd my-extension

Cargo.toml:

[lib]
crate-type = ["cdylib"]

[dependencies]
spacedrive-sdk = { path = "../spacedrive-sdk" }
serde = { version = "1.0", features = ["derive"] }

src/lib.rs:

use spacedrive_sdk::prelude::*;
use spacedrive_sdk::{extension, job};

#[extension(
    id = "my-extension",
    name = "My Extension",
    version = "0.1.0"
)]
struct MyExtension;

#[derive(Serialize, Deserialize, Default)]
pub struct MyJobState {
    pub counter: u32,
}

#[job]
fn my_job(ctx: &JobContext, state: &mut MyJobState) -> Result<()> {
    ctx.log("Job starting!");

    state.counter += 1;
    ctx.report_progress(1.0, "Done!");

    Ok(())
}

3. Build

cargo build --target wasm32-unknown-unknown --release
cp target/wasm32-unknown-unknown/release/my_extension.wasm .

4. Create manifest.json

{
  "id": "my-extension",
  "name": "My Extension",
  "version": "0.1.0",
  "wasm_file": "my_extension.wasm",
  "permissions": {
    "methods": ["vdfs.*", "ai.*"],
    "libraries": ["*"]
  }
}

The Beautiful API

Before Macros (Manual FFI):

#[no_mangle]
pub extern "C" fn execute_my_job(
    ctx_ptr: u32, ctx_len: u32,
    state_ptr: u32, state_len: u32
) -> i32 {
    let ctx_json = unsafe { /* 30 lines of pointer manipulation */ };
    let mut state = /* 40 lines of deserialization */;
    // ... business logic buried in boilerplate ...
}

180+ lines, lots of unsafe

After Macros (Beautiful):

#[job]
fn my_job(ctx: &JobContext, state: &mut MyJobState) -> Result<()> {
    // Just write business logic!
    ctx.log("Working...");
    state.counter += 1;
    Ok(())
}

60-80 lines, zero unsafe, pure logic

API Reference

Extension Container

#[extension(
    id = "finance",
    name = "Spacedrive Finance",
    version = "0.1.0"
)]
struct Finance;

Generates:

plugin_init() export
plugin_cleanup() export
Metadata for manifest generation

Job Definition

#[job]
fn email_scan(ctx: &JobContext, state: &mut EmailScanState) -> Result<()> {
    // Progress reporting
    ctx.report_progress(0.5, "Half done");

    // Checkpointing
    ctx.checkpoint(state)?;

    // Interruption handling
    if ctx.check_interrupt() {
        return Err(Error::OperationFailed("Interrupted".into()));
    }

    // Metrics
    ctx.increment_items(1);
    ctx.increment_bytes(1000);

    // Warnings
    ctx.add_warning("Non-fatal issue");

    // Full SDK access
    let entry = ctx.vdfs().create_entry(...)?;
    let ocr = ctx.ai().ocr(&pdf, ...)?;

    Ok(())
}

VDFS Operations

// Create entries
let entry = ctx.vdfs().create_entry(CreateEntry {
    name: "My File".into(),
    path: "path/to/file".into(),
    entry_type: "Document".into(),
    metadata: None,
})?;

// Write sidecars
ctx.vdfs().write_sidecar(entry.id, "metadata.json", data)?;

// Read sidecars
let data = ctx.vdfs().read_sidecar(entry.id, "metadata.json")?;

AI Operations

// OCR
let ocr = ctx.ai().ocr(&pdf_bytes, OcrOptions::default())?;

// Classification
let result = ctx.ai().classify_text(&text, "Extract data")?;

// Embeddings
let embedding = ctx.ai().embed("query text")?;

Credentials

// Store OAuth
ctx.credentials().store("gmail", Credential::oauth2(
    access_token,
    Some(refresh_token),
    3600,
    vec!["https://www.googleapis.com/auth/gmail.readonly".into()]
))?;

// Get (auto-refreshes)
let cred = ctx.credentials().get("gmail")?;

Examples

See extensions/test-extension/ for a complete working example.

Building

All extensions:

cd extensions/test-extension
cargo build --target wasm32-unknown-unknown --release

Documentation

SDK API Vision - Future API improvements
Before/After Comparison - See the transformation
WASM Architecture - Technical details
Platform Revenue Model - Business case

Extension development is now beautiful, safe, and productive. Start building!