add best practice guide

docs/best_practice.md

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+# Best Practices Guide
+
+## Core Design Principles
+
+### 1. Single Responsibility
+
+- Each agent should handle one primary function
+- Break complex behaviors into specialized agents
+- Keep message handlers focused and specific
+
+```python
+# Good
+class DataValidator(Worker):
+    async def validate(self, data): pass
+
+
+class DataProcessor(Worker):
+    async def process(self, data): pass
+
+
+# Avoid
+class DataHandler(Worker):
+    async def validate_and_process(self, data): pass
+```
+
+### 2. Message Immutability
+
+- Define messages using dataclasses
+- Never modify received messages
+- Create new instances for changes
+
+```python
+@dataclass(frozen=True)  # Enforces immutability
+class TaskMessage:
+    id: str
+    data: Any
+    timestamp: float = field(default_factory=time.time)
+```
+
+### 3. Event-Driven Architecture
+
+- Use decorators for message handling
+- Implement asynchronous communication
+- Handle events independently
+
+```python
+class EventDrivenAgent(Worker):
+    @on(TaskMessage)
+    async def handle_task(self, msg: TaskMessage):
+        await self.process_task(msg)
+
+    @on_connect("*")
+    async def handle_connection(self, topic: str, agent: AgentDetail):
+        await self.initialize_connection(agent)
+```
+
+## Architecture Patterns
+
+### 1. Layered Communication
+
+```python
+class SystemArchitecture:
+    def __init__(self):
+        self.layers = {
+            'coordination': AdminAgent(),
+            'processing': [WorkerAgent() for _ in range(3)],
+            'storage': StorageAgent()
+        }
+```
+
+### 2. State Management
+
+```python
+class StatefulAgent(Worker):
+    def __init__(self):
+        self.state = AgentState.IDLE
+        self._transitions = {
+            AgentState.IDLE: [AgentState.PROCESSING],
+            AgentState.PROCESSING: [AgentState.COMPLETED, AgentState.ERROR]
+        }
+
+    async def transition(self, new_state: AgentState):
+        if new_state in self._transitions[self.state]:
+            self.state = new_state
+```
+
+### 3. Resource Management
+
+```python
+class ResourceAwareAgent(Worker):
+    async def __aenter__(self):
+        await self.initialize_resources()
+        return self
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        await self.cleanup_resources()
+```
+
+## Error Handling and Resilience
+
+### 1. Graceful Error Recovery
+
+```python
+class ResilientAgent(Worker):
+    async def execute_with_retry(self, task, max_retries=3):
+        for attempt in range(max_retries):
+            try:
+                return await self.process(task)
+            except Exception as e:
+                if attempt == max_retries - 1:
+                    await self.handle_failure(task, e)
+                await asyncio.sleep(2 ** attempt)
+```
+
+### 2. Circuit Breaking
+
+```python
+class CircuitBreaker:
+    def __init__(self, failure_threshold=5, reset_timeout=60):
+        self.failures = 0
+        self.threshold = failure_threshold
+        self.reset_timeout = reset_timeout
+        self.state = 'closed'
+
+    async def call(self, func, *args):
+        if self.state == 'open':
+            raise CircuitBreakerOpen()
+
+        try:
+            result = await func(*args)
+            self.failures = 0
+            return result
+        except Exception:
+            self.failures += 1
+            if self.failures >= self.threshold:
+                self.state = 'open'
+                asyncio.create_task(self.reset_timer())
+            raise
+```
+
+## Performance Optimization
+
+### 1. Message Batching
+
+```python
+class BatchProcessor(Worker):
+    def __init__(self, batch_size=100):
+        self.batch = []
+        self.batch_size = batch_size
+
+    async def process(self, item):
+        self.batch.append(item)
+        if len(self.batch) >= self.batch_size:
+            await self.process_batch(self.batch)
+            self.batch = []
+```
+
+### 2. Resource Pooling
+
+```python
+class ResourcePool:
+    def __init__(self, pool_size):
+        self.pool = asyncio.Queue(pool_size)
+        self.semaphore = asyncio.Semaphore(pool_size)
+
+    async def acquire(self):
+        async with self.semaphore:
+            return await self.pool.get()
+
+    async def release(self, resource):
+        await self.pool.put(resource)
+```
+
+## Security Best Practices
+
+### 1. Message Authentication
+
+```python
+class SecureAgent(Worker):
+    def authenticate_message(self, message, signature):
+        return hmac.verify(
+            message.content,
+            signature,
+            self.secret_key
+        )
+```
+
+### 2. Access Control
+
+```python
+class SecureWorker(Worker):
+    async def on_message(self, agent: AgentDetail, data: bytes, time: int):
+        if not self.authorize_peer(agent.id):
+            logger.warning(f"Unauthorized message from {agent.id}")
+            return
+        await self.process_message(data)
+```
+
+## Monitoring and Observability
+
+### 1. Structured Logging
+
+```python
+class ObservableAgent(Worker):
+    async def log_event(self, event_type, **kwargs):
+        logger.info(
+            f"{event_type}",
+            agent_id=self.id,
+            timestamp=time.time(),
+            **kwargs
+        )
+```
+
+### 2. Metrics Collection
+
+```python
+class MetricsCollector:
+    def __init__(self):
+        self.metrics = {
+            'messages_processed': Counter(),
+            'processing_time': Histogram(),
+            'error_rate': Gauge()
+        }
+
+    async def record(self, metric, value):
+        self.metrics[metric].record(value)
+```
+
+## Implementation Guidelines
+
+### 1. Message Design
+
+- Include metadata for tracking
+- Add validation methods
+- Use clear naming conventions
+
+```python
+@dataclass
+class Message:
+    id: str = field(default_factory=uuid.uuid4)
+    timestamp: float = field(default_factory=time.time)
+    payload: Any
+    metadata: Dict = field(default_factory=dict)
+
+    def validate(self) -> bool:
+        return bool(self.payload)
+```
+
+### 2. Communication Patterns
+
+- Use broadcast for system-wide messages
+- Direct messages for point-to-point
+- Topic-based for selective communication
+
+```python
+class CommunicationPatterns:
+    async def broadcast_update(self, update):
+        await self.broadcast_message(update)
+
+    async def direct_message(self, peer_id, message):
+        await self.send_message(peer_id, message)
+
+    async def topic_message(self, topic, message):
+        await self.publish(topic, message)
+```
+
+### 3. State Transitions
+
+- Define clear state machines
+- Validate transitions
+- Log state changes
+
+```python
+class WorkflowAgent(Worker):
+    async def transition_state(self, new_state):
+        if new_state not in self.valid_transitions[self.current_state]:
+            raise InvalidTransition(f"{self.current_state} -> {new_state}")
+
+        self.current_state = new_state
+        await self.log_event("state_change", new_state=new_state)
+```
+
+## Common Pitfalls
+
+1. Race Conditions
+
+- Use synchronization primitives
+- Implement proper locking
+- Handle concurrent access
+
+2. Memory Leaks
+
+- Clean up resources properly
+- Implement context managers
+- Monitor memory usage
+
+3. Message Overflow
+
+- Implement backpressure
+- Use flow control
+- Handle queue limits
+
+4. Error Propagation
+
+- Define error boundaries
+- Implement recovery strategies
+- Log error contexts
+
+## Best Practices Checklist
+
+### Design
+
+- [ ] Single responsibility per agent
+- [ ] Clear message contracts
+- [ ] Proper state management
+- [ ] Error handling strategy
+
+### Implementation
+
+- [ ] Immutable messages
+- [ ] Resource cleanup
+- [ ] Proper logging
+- [ ] Security measures
+
+### Operation
+
+- [ ] Monitoring setup
+- [ ] Performance metrics
+- [ ] Error tracking
+- [ ] Resource monitoring
+
+## Deployment Considerations
+
+### Configuration
+
+```python
+class ConfigurableAgent(Worker):
+    def __init__(self, config_path: str):
+        self.config = self.load_config(config_path)
+        self.validate_config()
+```
+
+### Resource Limits
+
+```python
+class ResourceLimits:
+    def __init__(self):
+        self.max_connections = int(os.getenv('MAX_CONNECTIONS', 100))
+        self.message_timeout = int(os.getenv('MESSAGE_TIMEOUT', 30))
+```
+
+### Health Checks
+
+```python
+class HealthCheck(Worker):
+    async def check_health(self):
+        return {
+            'status': 'healthy',
+            'connections': len(self.connections),
+            'message_rate': self.message_counter.rate()
+        }
+```