// Enhanced Language Features Example
// Demonstrates the new type system, attributes, and namespaces from Phase 1
@trust("hybrid")
@secure
@web
@persistent
@chain("ethereum")
service EnhancedFeatures {
// State variables with new types
users: map<string, any>;
products: vector<any>;
transactions: map<string, bool>;
cache: map<string, any>;
db_connection: string;
web_server: string;
// Events
event UserCreated { user_id: string, name: string };
event ProductAdded { product_id: int, name: string };
event TransactionProcessed { tx_id: string, amount: int };
}
// Enhanced type definitions
struct User {
id: string;
name: string;
email: string;
wallet_address: string;
kyc_status: string;
created_at: int;
}
struct Product {
id: int;
name: string;
price: float;
description: string;
category: string;
in_stock: bool;
}
struct Transaction {
id: string;
from_address: string;
to_address: string;
amount: int;
status: string;
timestamp: int;
}
impl EnhancedFeatures {
// Initialize the service with database and web server
fn initialize() -> Result<Unit, Error> {
// Connect to database
let db_result = database::connect("postgresql://localhost/enhanced_db");
match db_result {
Ok(db) => {
self.db_connection = "connected";
log::info("init", "Database connected successfully");
},
Err(error) => {
log::error("init", format!("Database connection failed: {}", error));
return Err(Error::new("Database connection failed", error));
}
}
// Create web server
let server = web::create_server(8080);
self.web_server = // format!("server_{}", 8080);
log::info("init", "Web server created successfully");
return Ok(Unit);
}
// Create a new user with KYC verification
fn create_user(name: string, email: string, wallet_address: string) -> Result<string, Error> {
// Perform KYC verification
let kyc_result = kyc::verify_identity("securekyc", wallet_address, "basic", {
"name": name,
"email": email
});
if kyc_result.get("status") != "verified" {
return Err(Error::new("KYC verification failed", "User verification incomplete"));
}
// Create user in database
let user_id = "user_" + crypto::hash(name);
let user = {
"id": user_id,
"name": name,
"email": email,
"wallet_address": wallet_address,
"kyc_status": "verified",
"created_at": chain::get_block_timestamp()
};
// Store in database
let insert_result = database::query(self.db_connection,
"INSERT INTO users (id, name, email, wallet_address, kyc_status, created_at) VALUES (?, ?, ?, ?, ?, ?)",
[user["id"], user["name"], user["email"], user["wallet_address"], user["kyc_status"], user["created_at"]]
);
match insert_result {
Ok(_) => {
self.users[user_id] = user;
log::info("create_user", "User created: " + user_id);
return Ok(user_id);
},
Err(error) => {
log::error("create_user", format!("Database error: {}", error));
return Err(Error::new("Database error", error));
}
}
}
// Add a product with web interface
fn add_product(name: string, price: float, description: string, category: string) -> Result<int, Error> {
let product_id = self.products.size() + 1;
let product = {
"id": product_id,
"name": name,
"price": price,
"description": description,
"category": category,
"in_stock": true
};
// Add to database
let insert_result = database::query(self.db_connection,
"INSERT INTO products (id, name, price, description, category, in_stock) VALUES ($1, $2, $3, $4, $5, $6)",
[product.id, product.name, product.price, product.description, product.category, product.in_stock]
);
match insert_result {
Ok(_) => {
self.products.push(product);
self.emit(ProductAdded { product_id: product_id, name: name });
log::info("add_product", format!("Product added: {}", product_id));
return Ok(product_id);
},
Err(error) => {
log::error("add_product", format!("Database error: {}", error));
return Err(Error::new("Database error", error));
}
}
}
// Process a transaction with AML check
fn process_transaction(from_address: string, to_address: string, amount: int) -> Result<string, Error> {
// Perform AML check
let aml_result = aml::perform_check("chainalysis", from_address, "sanctions", {
"amount": amount,
"to_address": to_address
});
if aml_result.get("status") != "passed" {
return Err(Error::new("AML check failed", "Transaction blocked by AML"));
}
// Create transaction
let tx_id = format!("tx_{}", crypto::hash(format!("{}{}{}", from_address, to_address, amount)));
let transaction = Transaction {
id: tx_id.clone(),
from_address: from_address,
to_address: to_address,
amount: amount,
status: "pending",
timestamp: chain::get_block_timestamp(1),
};
// Store in database
let insert_result = database::query(self.db_connection,
"INSERT INTO transactions (id, from_address, to_address, amount, status, timestamp) VALUES ($1, $2, $3, $4, $5, $6)",
[transaction.id, transaction.from_address, transaction.to_address, transaction.amount, transaction.status, transaction.timestamp]
);
match insert_result {
Ok(_) => {
self.transactions.insert(tx_id.clone());
self.emit(TransactionProcessed { tx_id: tx_id.clone(), amount: amount });
log::info("process_transaction", format!("Transaction processed: {}", tx_id));
return Ok(tx_id);
},
Err(error) => {
log::error("process_transaction", format!("Database error: {}", error));
return Err(Error::new("Database error", error));
}
}
}
// Web API endpoint for getting users
fn get_users_api() -> HttpResponse {
let users_result = database::query(self.db_connection, "SELECT * FROM users", []);
match users_result {
Ok(result) => {
let users_data = result.rows;
return web::json_response(users_data);
},
Err(error) => {
log::error("get_users_api", format!("Database error: {}", error));
return web::error_response(500, format!("Database error: {}", error));
}
}
}
// Web API endpoint for creating users
fn create_user_api(request: HttpRequest) -> HttpResponse {
let body = request.body;
let user_data = web::parse_json(body);
let name = user_data.get("name");
let email = user_data.get("email");
let wallet_address = user_data.get("wallet_address");
if name == null || email == null || wallet_address == null {
return web::error_response(400, "Missing required fields");
}
let create_result = self.create_user(name, email, wallet_address);
match create_result {
Ok(user_id) => {
let response_data = {
let mut data = HashMap::new();
data["user_id"] = user_id;
data["status"] = "created";
data
};
return web::json_response(response_data);
},
Err(error) => {
log::error("create_user_api", format!("Error: {}", error));
return web::error_response(500, // format!("Error: {}", error));
}
}
}
// Cache management
fn cache_set(key: string, value: any, ttl: int) {
self.cache.insert(key, value);
log::info("cache", format!("Cached value for key: {}", key));
}
fn cache_get(key: string) -> Option<any> {
if self.cache.contains_key(key) {
return Some(self.cache.get(key));
}
return None;
}
// Get user by ID with caching
fn get_user_by_id(user_id: string) -> Option<User> {
// Check cache first
let cached_user = self.cache_get(format!("user_{}", user_id));
if cached_user != None {
return cached_user;
}
// Query database
let query_result = database::query(self.db_connection,
"SELECT * FROM users WHERE id = $1",
[user_id]
);
match query_result {
Ok(result) => {
if result.rows.length > 0 {
let user_data = result.rows[0];
let user = User::from_row(user_data);
// Cache the result
self.cache_set(format!("user_{}", user_id), user.clone(), 300);
return Some(user);
}
return None;
},
Err(error) => {
log::error("get_user_by_id", format!("Database error: {}", error));
return None;
}
}
}
// Get all products with web rendering
fn get_products_web() -> Html {
let products_result = database::query(self.db_connection, "SELECT * FROM products", []);
match products_result {
Ok(result) => {
let html = web::create_html_element("div", {
let mut attrs = HashMap::new();
attrs["class"] = "products-container";
attrs
});
for product_data in result.rows {
let product = Product::from_row(product_data);
let product_element = web::create_html_element("div", {
let mut attrs = HashMap::new();
attrs["class"] = "product-item";
attrs
});
web::set_text(product_element, product.name + " - $" + product.price);
web::add_child(html, product_element);
}
return html;
},
Err(error) => {
log::error("get_products_web", format!("Database error: {}", error));
return web::create_html_element("div", {
let mut attrs = HashMap::new();
attrs["class"] = "error";
attrs
});
}
}
}
// Get service statistics
fn get_statistics() -> map<string, any> {
let mut stats = HashMap::new();
stats["total_users"] = self.users.size();
stats["total_products"] = self.products.length();
stats["total_transactions"] = self.transactions.size();
stats["cache_size"] = self.cache.size();
stats["db_connected"] = self.db_connection != "";
stats["web_server_running"] = self.web_server != "";
return stats;
}
}
// Main function to demonstrate enhanced features
fn main() {
let service = EnhancedFeatures::new();
// Initialize the service
let init_result = service.initialize();
match init_result {
Ok(_) => log::info("main", "Service initialized successfully"),
Err(error) => {
log::error("main", format!("Initialization failed: {}", error));
return;
}
}
// Create some test data
let user_result = service.create_user("John Doe", "john@example.com", "0x1234567890abcdef");
match user_result {
Ok(user_id) => log::info("main", format!("User created: {}", user_id)),
Err(error) => log::error("main", format!("User creation failed: {}", error)),
}
let product_result = service.add_product("Enhanced Product", 29.99, "A great product", "electronics");
match product_result {
Ok(product_id) => log::info("main", format!("Product added: {}", product_id)),
Err(error) => log::error("main", format!("Product addition failed: {}", error)),
}
let tx_result = service.process_transaction("0x1234567890abcdef", "0xfedcba0987654321", 100);
match tx_result {
Ok(tx_id) => log::info("main", format!("Transaction processed: {}", tx_id)),
Err(error) => log::error("main", format!("Transaction failed: {}", error)),
}
// Get statistics
let stats = service.get_statistics();
log::info("main", format!("Service statistics: {:?}", stats));
log::info("main", "Enhanced language features demonstration completed!");
}