aitbc/tests/contract_tests/test_blockchain_rpc_contract.py

"""
Contract tests for AITBC blockchain RPC interactions.
Tests verify that the blockchain RPC API maintains expected contracts and behaviors.
"""

import pytest
import httpx
from typing import Dict, Any, Optional
from unittest.mock import Mock, patch, AsyncMock


class BlockchainRPCContract:
    """
    Contract definition for blockchain RPC API.
    Defines expected behavior and response formats.
    """

    BASE_URL = "http://localhost:8006"
    
    # Expected response structures
    BLOCK_RESPONSE_SCHEMA = {
        "height": int,
        "hash": str,
        "parent_hash": str,
        "timestamp": int,
        "transactions": list
    }
    
    TRANSACTION_RESPONSE_SCHEMA = {
        "hash": str,
        "from": str,
        "to": str,
        "value": str,
        "nonce": int,
        "gas": int
    }
    
    ACCOUNT_RESPONSE_SCHEMA = {
        "address": str,
        "balance": int,
        "nonce": int
    }
    
    STATUS_RESPONSE_SCHEMA = {
        "syncing": bool,
        "current_block": int,
        "highest_block": int,
        "peers": int
    }


@pytest.mark.contract
class TestBlockchainRPCContracts:
    """Contract tests for blockchain RPC endpoints"""

    @pytest.fixture
    def client(self):
        """HTTP client for blockchain RPC"""
        return httpx.Client(timeout=30.0)

    @pytest.fixture
    def rpc_url(self):
        """Blockchain RPC base URL"""
        return BlockchainRPCContract.BASE_URL

    def test_get_block_contract(self, client, rpc_url):
        """
        Test contract for getting a block by height.
        
        Contract:
        - GET /rpc/blocks/{height} should return block data
        - Response should contain required fields: height, hash, parent_hash, timestamp, transactions
        - Height should be a non-negative integer
        - Hash should be a valid hex string
        """
        try:
            response = client.get(f"{rpc_url}/rpc/blocks/0")
            
            # Contract: Should return 200 for valid block height
            assert response.status_code in (200, 404), f"Expected 200 or 404, got {response.status_code}"
            
            if response.status_code == 200:
                data = response.json()
                
                # Contract: Response should be a dictionary
                assert isinstance(data, dict), "Response should be a dictionary"
                
                # Contract: Should contain required fields
                required_fields = ["height", "hash", "timestamp"]
                for field in required_fields:
                    assert field in data, f"Missing required field: {field}"
                
                # Contract: Height should be integer
                assert isinstance(data["height"], int), "Height should be an integer"
                assert data["height"] >= 0, "Height should be non-negative"
                
                # Contract: Hash should be hex string
                assert isinstance(data["hash"], str), "Hash should be a string"
                assert data["hash"].startswith("0x"), "Hash should start with 0x"
                
        except httpx.ConnectError:
            pytest.skip("Blockchain RPC not available")

    def test_get_head_block_contract(self, client, rpc_url):
        """
        Test contract for getting the head block.
        
        Contract:
        - GET /rpc/head should return current head block
        - Response should contain height and hash
        - Head block should be the highest known block
        """
        try:
            response = client.get(f"{rpc_url}/rpc/head")
            
            # Contract: Should return 200
            assert response.status_code in (200, 404), f"Expected 200 or 404, got {response.status_code}"
            
            if response.status_code == 200:
                data = response.json()
                
                # Contract: Should contain height and hash
                assert "height" in data, "Missing height field"
                assert "hash" in data, "Missing hash field"
                
                # Contract: Height should be non-negative
                assert data["height"] >= 0, "Height should be non-negative"
                
        except httpx.ConnectError:
            pytest.skip("Blockchain RPC not available")

    def test_get_transaction_contract(self, client, rpc_url):
        """
        Test contract for getting a transaction by hash.
        
        Contract:
        - GET /rpc/transaction/{hash} should return transaction data
        - Response should contain: hash, from, to, value, nonce
        - Transaction hash should match request
        """
        try:
            # Use a sample transaction hash (this may not exist)
            sample_hash = "0x" + "a" * 64
            response = client.get(f"{rpc_url}/rpc/transaction/{sample_hash}")
            
            # Contract: Should return 200 if found, 404 if not found
            assert response.status_code in (200, 404), f"Expected 200 or 404, got {response.status_code}"
            
            if response.status_code == 200:
                data = response.json()
                
                # Contract: Should contain transaction fields
                assert "hash" in data, "Missing hash field"
                assert data["hash"] == sample_hash, "Transaction hash should match request"
                
        except httpx.ConnectError:
            pytest.skip("Blockchain RPC not available")

    def test_get_account_balance_contract(self, client, rpc_url):
        """
        Test contract for getting account balance.
        
        Contract:
        - GET /rpc/account/{address} should return account data
        - Response should contain: address, balance, nonce
        - Address should match request
        - Balance should be non-negative integer
        """
        try:
            # Use a sample address
            sample_address = "0x" + "a" * 40
            response = client.get(f"{rpc_url}/rpc/account/{sample_address}")
            
            # Contract: Should return 200 or 404
            assert response.status_code in (200, 404), f"Expected 200 or 404, got {response.status_code}"
            
            if response.status_code == 200:
                data = response.json()
                
                # Contract: Should contain account fields
                assert "address" in data, "Missing address field"
                assert data["address"] == sample_address, "Address should match request"
                
                # Contract: Balance should be non-negative
                if "balance" in data:
                    assert isinstance(data["balance"], (int, str)), "Balance should be integer or string"
                
        except httpx.ConnectError:
            pytest.skip("Blockchain RPC not available")

    def test_send_transaction_contract(self, client, rpc_url):
        """
        Test contract for sending a transaction.
        
        Contract:
        - POST /rpc/sendTx should accept transaction payload
        - Response should contain transaction hash if successful
        - Should return error if transaction is invalid
        """
        try:
            # Create a sample transaction payload
            tx_payload = {
                "from": "0x" + "a" * 40,
                "to": "0x" + "b" * 40,
                "value": "1000000000000000000",  # 1 ETH in wei
                "nonce": 0,
                "gas": 21000
            }
            
            response = client.post(f"{rpc_url}/rpc/sendTx", json=tx_payload)
            
            # Contract: Should return 200, 400, or 500
            assert response.status_code in (200, 400, 500), f"Unexpected status code: {response.status_code}"
            
            if response.status_code == 200:
                data = response.json()
                # Contract: Should contain transaction hash on success
                assert "hash" in data or "tx_hash" in data, "Missing transaction hash in response"
                
        except httpx.ConnectError:
            pytest.skip("Blockchain RPC not available")

    def test_get_peers_contract(self, client, rpc_url):
        """
        Test contract for getting network peers.
        
        Contract:
        - GET /rpc/peers should return peer information
        - Response should be a list of peers
        - Each peer should have at least an ID or address
        """
        try:
            response = client.get(f"{rpc_url}/rpc/peers")
            
            # Contract: Should return 200
            assert response.status_code in (200, 404), f"Expected 200 or 404, got {response.status_code}"
            
            if response.status_code == 200:
                data = response.json()
                
                # Contract: Response should be a list
                assert isinstance(data, (list, dict)), "Response should be a list or dict"
                
                if isinstance(data, list) and data:
                    # Contract: Each peer should have identifier
                    peer = data[0]
                    assert isinstance(peer, dict), "Peer should be a dictionary"
                    assert len(peer) > 0, "Peer should have at least one field"
                
        except httpx.ConnectError:
            pytest.skip("Blockchain RPC not available")

    def test_get_status_contract(self, client, rpc_url):
        """
        Test contract for getting node status.
        
        Contract:
        - GET /rpc/status should return node status
        - Response should contain: syncing status, current block, highest block
        - Current block should not exceed highest block
        """
        try:
            response = client.get(f"{rpc_url}/rpc/status")
            
            # Contract: Should return 200
            assert response.status_code in (200, 404), f"Expected 200 or 404, got {response.status_code}"
            
            if response.status_code == 200:
                data = response.json()
                
                # Contract: Should contain status fields
                assert isinstance(data, dict), "Response should be a dictionary"
                
                # Contract: If syncing info present, validate it
                if "syncing" in data:
                    assert isinstance(data["syncing"], bool), "Syncing should be boolean"
                
                if "current_block" in data and "highest_block" in data:
                    assert data["current_block"] <= data["highest_block"], \
                        "Current block should not exceed highest block"
                
        except httpx.ConnectError:
            pytest.skip("Blockchain RPC not available")

    def test_rpc_response_format_contract(self, client, rpc_url):
        """
        Test contract for RPC response format.
        
        Contract:
        - All RPC responses should be JSON
        - Content-Type should be application/json
        - Response should be parseable as JSON
        """
        try:
            # Test multiple endpoints
            endpoints = [
                "/rpc/head",
                "/rpc/status",
                "/rpc/peers"
            ]
            
            for endpoint in endpoints:
                response = client.get(f"{rpc_url}{endpoint}")
                
                if response.status_code == 200:
                    # Contract: Should have JSON content type
                    assert "application/json" in response.headers.get("content-type", ""), \
                        f"{endpoint} should return JSON content type"
                    
                    # Contract: Should be parseable as JSON
                    try:
                        response.json()
                    except Exception as e:
                        pytest.fail(f"{endpoint} response should be valid JSON: {e}")
                
        except httpx.ConnectError:
            pytest.skip("Blockchain RPC not available")

    def test_rpc_error_handling_contract(self, client, rpc_url):
        """
        Test contract for RPC error handling.
        
        Contract:
        - Invalid endpoints should return 404
        - Invalid requests should return 400
        - Server errors should return 500
        - Error responses should contain error message
        """
        try:
            # Test invalid endpoint
            response = client.get(f"{rpc_url}/rpc/invalid_endpoint")
            assert response.status_code == 404, "Invalid endpoint should return 404"
            
            # Test invalid method
            response = client.post(f"{rpc_url}/rpc/head")
            assert response.status_code in (405, 404), "Invalid method should return 405 or 404"
            
        except httpx.ConnectError:
            pytest.skip("Blockchain RPC not available")


@pytest.mark.contract
class TestBlockchainRPCTimeouts:
    """Contract tests for RPC timeout behavior"""

    @pytest.fixture
    def slow_client(self):
        """HTTP client with short timeout for testing"""
        return httpx.Client(timeout=1.0)

    def test_rpc_timeout_contract(self, slow_client, rpc_url):
        """
        Test contract for RPC timeout handling.
        
        Contract:
        - Requests should respect timeout settings
        - Timeout should raise appropriate exception
        - Client should handle timeouts gracefully
        """
        try:
            # This should timeout if the endpoint is slow
            response = slow_client.get(f"{rpc_url}/rpc/head")
            # If it doesn't timeout, that's also valid
            assert response.status_code in (200, 404)
            
        except httpx.TimeoutException:
            # Contract: Timeout should raise TimeoutException
            pass  # Expected behavior
        except httpx.ConnectError:
            pytest.skip("Blockchain RPC not available")