wasm_sandbox/runtime/
component.rs

1//! WebAssembly Component Model implementation
2//! 
3//! This module provides support for the WebAssembly Component Model,
4//! which enables more complex and type-safe interactions between host and guest.
5//! 
6//! The Component Model allows for:
7//! - Interface-driven development
8//! - Multi-language component authoring
9//! - Structured data exchange
10//! - Explicit imports and exports
11
12use std::sync::Arc;
13use std::path::Path;
14use uuid::Uuid;
15
16use wasmtime::component::{Component, Instance, Linker};
17use wasmtime::{Engine, Store};
18
19use crate::error::{Error, Result};
20use crate::runtime::{WasmModule, WasmInstance, WasmRuntime, WasmFunctionCaller, WasmInstanceState, ModuleId, RuntimeConfig, RuntimeMetrics};
21use crate::security::{Capabilities, ResourceLimits};
22
23/// A WebAssembly Component Module
24pub struct ComponentModule {
25    /// Unique identifier for this module
26    id: ModuleId,
27    
28    /// The compiled component
29    component: Component,
30    
31    /// Component name if available
32    name: Option<String>,
33    
34    /// Component metadata
35    metadata: serde_json::Value,
36}
37
38impl ComponentModule {
39    /// Create a new Component Module from WebAssembly bytes
40    pub fn new(engine: &Engine, bytes: &[u8]) -> Result<Self> {
41        let component = Component::new(engine, bytes)
42            .map_err(|e| Error::ModuleLoad { message: e.to_string() })?;
43            
44        Ok(Self {
45            id: ModuleId::new(),
46            component,
47            name: None,
48            metadata: serde_json::Value::Null,
49        })
50    }
51    
52    /// Get the component
53    pub fn component(&self) -> &Component {
54        &self.component
55    }
56    
57    /// Set component name
58    pub fn with_name(mut self, name: impl Into<String>) -> Self {
59        self.name = Some(name.into());
60        self
61    }
62    
63    /// Set component metadata
64    pub fn with_metadata(mut self, metadata: serde_json::Value) -> Self {
65        self.metadata = metadata;
66        self
67    }
68}
69
70impl WasmModule for ComponentModule {
71    fn id(&self) -> ModuleId {
72        self.id
73    }
74    
75    fn name(&self) -> Option<&str> {
76        self.name.as_deref()
77    }
78    
79    fn size(&self) -> usize {
80        // Components don't expose raw size easily, return 0 for now
81        0
82    }
83    
84    fn exports(&self) -> Vec<String> {
85        // Component exports would need to be introspected
86        // For now return empty vector
87        Vec::new()
88    }
89    
90    fn clone_module(&self) -> Box<dyn WasmModule> {
91        Box::new(ComponentModule {
92            id: self.id,
93            component: self.component.clone(),
94            name: self.name.clone(),
95            metadata: self.metadata.clone(),
96        })
97    }
98    
99    fn as_any(&self) -> &dyn std::any::Any {
100        self
101    }
102}
103
104/// A WebAssembly Component Instance
105pub struct ComponentInstance<T: 'static> {
106    /// Unique identifier for this instance
107    #[allow(dead_code)]
108    id: Uuid,
109    
110    /// The module this instance was created from
111    #[allow(dead_code)]
112    module_id: Uuid,
113    
114    /// The wasmtime component instance
115    instance: Instance,
116    
117    /// Store containing the instance
118    store: Store<T>,
119    
120    /// Instance capabilities
121    #[allow(dead_code)]
122    capabilities: Capabilities,
123    
124    /// Resource limits
125    #[allow(dead_code)]
126    resource_limits: ResourceLimits,
127}
128
129impl<T: Send + 'static> ComponentInstance<T> {
130    /// Create a new Component Instance
131    pub fn new(
132        module: &ComponentModule, 
133        mut store: Store<T>,
134        linker: &Linker<T>,
135        capabilities: Capabilities,
136        resource_limits: ResourceLimits
137    ) -> Result<Self> {
138        let instance = linker.instantiate(&mut store, &module.component)
139            .map_err(|e| Error::InstanceCreation { reason: e.to_string(), instance_id: None })?;
140            
141        Ok(Self {
142            id: Uuid::new_v4(),
143            module_id: module.id.as_uuid(),
144            instance,
145            store,
146            capabilities,
147            resource_limits,
148        })
149    }
150    
151    /// Get a reference to the store
152    pub fn store(&self) -> &Store<T> {
153        &self.store
154    }
155    
156    /// Get a mutable reference to the store
157    pub fn store_mut(&mut self) -> &mut Store<T> {
158        &mut self.store
159    }
160    
161    /// Get a reference to the instance
162    pub fn instance(&self) -> &Instance {
163        &self.instance
164    }
165}
166
167impl<T: Send + Sync + 'static> WasmInstance for ComponentInstance<T> {
168    fn state(&self) -> WasmInstanceState {
169        WasmInstanceState::Running // Components are always running if created
170    }
171    
172    fn memory_usage(&self) -> usize {
173        // Component memory usage would need specific wasmtime API calls
174        0
175    }
176    
177    fn fuel_usage(&self) -> Option<u64> {
178        // Fuel tracking would need to be implemented in store config
179        None
180    }
181    
182    fn reset_fuel(&self) -> Result<()> {
183        // Would need store.set_fuel() call
184        Ok(())
185    }
186    
187    fn add_fuel(&self, _fuel: u64) -> Result<()> {
188        // Would need store.add_fuel() call
189        Ok(())
190    }
191    
192    unsafe fn memory_ptr(&self) -> Result<*mut u8> {
193        // Direct memory access for components would be complex
194        Err(Error::UnsupportedOperation { message: "Direct memory access not supported for components".to_string() })
195    }
196    
197    fn memory_size(&self) -> usize {
198        // Component memory size would need specific API
199        0
200    }
201    
202    fn function_caller(&self) -> Box<dyn WasmFunctionCaller> {
203        Box::new(ComponentFunctionCaller {})
204    }
205    
206    fn call_simple_function(&self, _function_name: &str, _params: &[i32]) -> Result<i32> {
207        // Component function calling is different from core modules
208        Err(Error::UnsupportedOperation { message: "Simple function calls not supported for components".to_string() })
209    }
210}
211
212/// Function caller implementation for WebAssembly Components
213pub struct ComponentFunctionCaller {}
214
215impl WasmFunctionCaller for ComponentFunctionCaller {
216    fn call_function_json(
217        &self,
218        _function_name: &str,
219        _params_json: &str,
220    ) -> Result<String> {
221        Err(Error::UnsupportedOperation { message: "Component function calling not yet implemented".to_string() })
222    }
223    
224    fn call_function_msgpack(
225        &self,
226        _function_name: &str,
227        _params_msgpack: &[u8],
228    ) -> Result<Vec<u8>> {
229        Err(Error::UnsupportedOperation { message: "Component function calling not yet implemented".to_string() })
230    }
231    
232    fn as_any(&self) -> &dyn std::any::Any {
233        self
234    }
235}
236
237/// Component Model runtime manager
238pub struct ComponentRuntime {
239    /// Wasmtime engine
240    engine: Engine,
241    
242    /// Default capabilities for new instances
243    #[allow(dead_code)]
244    default_capabilities: Capabilities,
245    
246    /// Default resource limits for new instances
247    #[allow(dead_code)]
248    default_resource_limits: ResourceLimits,
249}
250
251impl ComponentRuntime {
252    /// Create a new Component Model runtime
253    pub fn new(
254        default_capabilities: Capabilities,
255        default_resource_limits: ResourceLimits,
256    ) -> Result<Self> {
257        let mut config = wasmtime::Config::new();
258        
259        // Configure for component model support
260        config.wasm_component_model(true);
261        
262        // Apply other security settings
263        if default_resource_limits.memory.max_memory_pages > 0 {
264            config.max_wasm_stack(default_resource_limits.memory.max_memory_pages as usize * 65536);
265        }
266        
267        let engine = Engine::new(&config)
268            .map_err(|e| Error::RuntimeInitialization { message: e.to_string() })?;
269            
270        Ok(Self {
271            engine,
272            default_capabilities,
273            default_resource_limits,
274        })
275    }
276    
277    /// Create a new component module from bytes
278    pub fn create_component_module(&self, bytes: &[u8]) -> Result<ComponentModule> {
279        ComponentModule::new(&self.engine, bytes)
280    }
281    
282    /// Create a new component module from a file
283    pub fn create_component_module_from_file(&self, path: impl AsRef<Path>) -> Result<ComponentModule> {
284        let bytes = std::fs::read(path)
285            .map_err(|e| Error::IoError { message: e.to_string() })?;
286        self.create_component_module(&bytes)
287    }
288    
289    /// Create a default store for components
290    pub fn create_store<T>(&self, data: T) -> Store<T> {
291        Store::new(&self.engine, data)
292    }
293    
294    /// Create a default linker for components
295    pub fn create_linker<T>(&self) -> Linker<T> {
296        Linker::new(&self.engine)
297    }
298}
299
300impl WasmRuntime for ComponentRuntime {
301    fn initialize(&mut self, _config: RuntimeConfig) -> Result<()> {
302        // Component runtime initialization would configure the engine
303        Ok(())
304    }
305    
306    fn load_module(&self, bytes: &[u8]) -> Result<Box<dyn WasmModule>> {
307        let module = self.create_component_module(bytes)?;
308        Ok(Box::new(module))
309    }
310    
311    fn get_module(&self, _id: ModuleId) -> Result<Arc<dyn WasmModule>> {
312        // Would need to store modules in a map to retrieve by ID
313        Err(Error::UnsupportedOperation { message: "Module retrieval not implemented for components yet".to_string() })
314    }
315    
316    fn get_module_ids(&self) -> Vec<ModuleId> {
317        // Would return IDs from stored modules
318        Vec::new()
319    }
320    
321    fn create_instance(
322        &self, 
323        _module: &dyn WasmModule, 
324        _resources: ResourceLimits,
325        _capabilities: Capabilities,
326    ) -> Result<Box<dyn WasmInstance>> {
327        Err(Error::UnsupportedOperation { message: "Instance creation interface not implemented for components yet".to_string() })
328    }
329    
330    fn get_metrics(&self) -> RuntimeMetrics {
331        RuntimeMetrics {
332            compiled_modules: 0,
333            active_instances: 0,
334            total_memory_usage: 0,
335            peak_memory_usage: 0,
336            fuel_consumption_rate: None,
337            cache_hit_rate: None,
338            last_compilation_time_ms: None,
339        }
340    }
341    
342    fn shutdown(&self) -> Result<()> {
343        // Component runtime shutdown
344        Ok(())
345    }
346}
wasm_sandbox/runtime/component.rs

wasm_sandbox/runtime/
component.rs
