astralis/examples/PathRouting.vala

using Astralis;
using Invercargill;
using Invercargill.DataStructures;

/**
 * PathRouting Example
 * 
 * Demonstrates path component parsing and routing in Astralis.
 * Uses the Router's named segment feature for dynamic routing.
 */

// Root handler - shows available endpoints
class RootHandler : Object, RouteHandler {
    public async HttpResult handle_route(HttpContext http_context, RouteContext route_context) throws Error {
        return new HttpStringResult("""Welcome to the Path Routing Example!

Available endpoints:
  GET /                           - This message
  GET /hello                      - Simple greeting
  GET /hello/{name}               - Greeting with name
  GET /users                      - List all users
  GET /users/{id}                 - Get user by ID
  GET /users/{id}/posts           - Get posts for a user
  GET /api/v1/status              - API status
  GET /api/v1/items/{id}          - Get item by ID
  GET /files/{category}/{name}    - Get file by category and name
  GET /pathinfo                   - Path information demo
""");
    }
}

// Simple hello handler
class HelloHandler : Object, RouteHandler {
    public async HttpResult handle_route(HttpContext http_context, RouteContext route_context) throws Error {
        return new HttpStringResult("Hello, World!");
    }
}

// Hello with name handler - uses named segment
class HelloNameHandler : Object, RouteHandler {
    public async HttpResult handle_route(HttpContext http_context, RouteContext route_context) throws Error {
        var name = route_context.get_segment("name");
        return new HttpStringResult(@"Hello, $name!");
    }
}

// Users list handler
class UsersHandler : Object, RouteHandler {
    public async HttpResult handle_route(HttpContext http_context, RouteContext route_context) throws Error {
        var users = new Series<User>();
        users.add(new User(1, "Alice", "alice@example.com"));
        users.add(new User(2, "Bob", "bob@example.com"));
        users.add(new User(3, "Charlie", "charlie@example.com"));
        
        var json_parts = new Series<string>();
        json_parts.add(@"{ \"users\": [");
        
        bool first = true;
        users.to_immutable_buffer().iterate((user) => {
            if (!first) json_parts.add(", ");
            json_parts.add(user.to_json());
            first = false;
        });
        
        json_parts.add("] }");
        
        var json_string = json_parts.to_immutable_buffer()
            .aggregate<string>("", (acc, s) => acc + s);
        
        return new HttpStringResult(json_string)
            .set_header("Content-Type", "application/json");
    }
}

// User by ID handler - uses named segment
class UserByIdHandler : Object, RouteHandler {
    public async HttpResult handle_route(HttpContext http_context, RouteContext route_context) throws Error {
        var id_str = route_context.get_segment("id");
        var id = int.parse(id_str);
        
        // Simulated user lookup
        var users = new Series<User>();
        users.add(new User(1, "Alice", "alice@example.com"));
        users.add(new User(2, "Bob", "bob@example.com"));
        users.add(new User(3, "Charlie", "charlie@example.com"));
        
        var user = users.to_immutable_buffer()
            .first_or_default(u => u.id == id);
        
        if (user == null) {
            return new HttpStringResult(@"{ \"error\": \"User not found\" }")
                .set_header("Content-Type", "application/json");
        }
        
        return new HttpStringResult(user.to_json())
            .set_header("Content-Type", "application/json");
    }
}

// User posts handler - uses named segment
class UserPostsHandler : Object, RouteHandler {
    public async HttpResult handle_route(HttpContext http_context, RouteContext route_context) throws Error {
        var id_str = route_context.get_segment("id");
        var id = int.parse(id_str);
        
        // Simulated posts for user
        var posts = new Series<Post>();
        posts.add(new Post(101, id, "First Post", "This is my first post"));
        posts.add(new Post(102, id, "Second Post", "This is my second post"));
        
        var json_parts = new Series<string>();
        json_parts.add(@"{ \"user_id\": $id, \"posts\": [");
        
        bool first = true;
        posts.to_immutable_buffer().iterate((post) => {
            if (!first) json_parts.add(", ");
            json_parts.add(post.to_json());
            first = false;
        });
        
        json_parts.add("] }");
        
        var json_string = json_parts.to_immutable_buffer()
            .aggregate<string>("", (acc, s) => acc + s);
        
        return new HttpStringResult(json_string)
            .set_header("Content-Type", "application/json");
    }
}

// API status handler
class ApiStatusHandler : Object, RouteHandler {
    public async HttpResult handle_route(HttpContext http_context, RouteContext route_context) throws Error {
        var status = new Dictionary<string, string>();
        status.set("status", "operational");
        status.set("version", "1.0.0");
        status.set("timestamp", new DateTime.now_local().format_iso8601());
        
        var json_parts = new Series<string>();
        json_parts.add("{ ");
        
        bool first = true;
        status.to_immutable_buffer().iterate((kv) => {
            if (!first) json_parts.add(", ");
            json_parts.add(@"\"$(kv.key)\": \"$(kv.value)\"");
            first = false;
        });
        
        json_parts.add(" }");
        
        var json_string = json_parts.to_immutable_buffer()
            .aggregate<string>("", (acc, s) => acc + s);
        
        return new HttpStringResult(json_string)
            .set_header("Content-Type", "application/json");
    }
}

// API item handler - uses named segment
class ApiItemHandler : Object, RouteHandler {
    public async HttpResult handle_route(HttpContext http_context, RouteContext route_context) throws Error {
        var id_str = route_context.get_segment("id");
        var id = int.parse(id_str);
        
        var items = new Dictionary<int, Item>();
        items.set(1, new Item(1, "Widget", "A useful widget", 9.99));
        items.set(2, new Item(2, "Gadget", "A fancy gadget", 19.99));
        items.set(3, new Item(3, "Doohickey", "A mysterious doohickey", 29.99));
        
        Item? item = null;
        if (items.try_get(id, out item)) {
            return new HttpStringResult(item.to_json())
                .set_header("Content-Type", "application/json");
        }
        
        return new HttpStringResult(@"{ \"error\": \"Item not found\" }")
            .set_header("Content-Type", "application/json");
    }
}

// Files handler - uses two named segments
class FilesHandler : Object, RouteHandler {
    public async HttpResult handle_route(HttpContext http_context, RouteContext route_context) throws Error {
        var category = route_context.get_segment("category");
        var name = route_context.get_segment("name");
        
        // Simulated file lookup
        var files = new Dictionary<string, Dictionary<string, ExampleFile>>();
        var docs = new Dictionary<string, ExampleFile>();
        docs.set("readme.txt", new ExampleFile("readme.txt", "docs", "This is the readme file"));
        docs.set("guide.pdf", new ExampleFile("guide.pdf", "docs", "User guide"));
        
        var images = new Dictionary<string, ExampleFile>();
        images.set("logo.png", new ExampleFile("logo.png", "images", "Company logo"));
        images.set("banner.jpg", new ExampleFile("banner.jpg", "images", "Website banner"));
        
        files.set("docs", docs);
        files.set("images", images);
        
        Dictionary<string, ExampleFile>? category_files = null;
        if (files.try_get(category, out category_files)) {
            ExampleFile? file = null;
            if (category_files.try_get(name, out file)) {
                return new HttpStringResult(file.to_json())
                    .set_header("Content-Type", "application/json");
            }
        }
        
        return new HttpStringResult(@"{ \"error\": \"File not found in category '$category'\" }")
            .set_header("Content-Type", "application/json");
    }
}

// Path info handler
class PathInfoHandler : Object, RouteHandler {
    public async HttpResult handle_route(HttpContext http_context, RouteContext route_context) throws Error {
        var parts = new Series<string>();
        parts.add("Path Information:\n");
        parts.add(@"  Raw path: $(http_context.request.raw_path)\n");
        parts.add(@"  Path components: $(http_context.request.path_components.count())\n");
        parts.add("\n  Components:\n");
        
        http_context.request.path_components
            .with_positions()
            .iterate((pair) => {
                parts.add(@"    [$((int)pair.position)]: $(pair.item)\n");
            });
        
        parts.add(@"\n  Query string: $(http_context.request.query_string)\n");
        
        // Show named segments from route context
        parts.add("\n  Named segments:\n");
        route_context.named_segments.to_immutable_buffer()
            .iterate((kv) => {
                parts.add(@"    $(kv.key): $(kv.value)\n");
            });
        
        var result = parts.to_immutable_buffer()
            .aggregate<string>("", (acc, s) => acc + s);
        
        return new HttpStringResult(result);
    }
}

void main() {
    var router = new Router();
    var server = new Server(8082, router);
    
    // Register routes with named segments
    router.get("/", new RootHandler());
    router.get("/hello", new HelloHandler());
    router.get("/hello/{name}", new HelloNameHandler());
    router.get("/users", new UsersHandler());
    router.get("/users/{id}", new UserByIdHandler());
    router.get("/users/{id}/posts", new UserPostsHandler());
    router.get("/api/v1/status", new ApiStatusHandler());
    router.get("/api/v1/items/{id}", new ApiItemHandler());
    router.get("/files/{category}/{name}", new FilesHandler());
    router.get("/pathinfo", new PathInfoHandler());
    
    print("Path Routing Example Server running on port 8082\n");
    print("Try these endpoints:\n");
    print("  - http://localhost:8082/\n");
    print("  - http://localhost:8082/hello\n");
    print("  - http://localhost:8082/hello/Alice\n");
    print("  - http://localhost:8082/users\n");
    print("  - http://localhost:8082/users/1\n");
    print("  - http://localhost:8082/users/1/posts\n");
    print("  - http://localhost:8082/api/v1/status\n");
    print("  - http://localhost:8082/api/v1/items/2\n");
    print("  - http://localhost:8082/files/docs/readme.txt\n");
    print("  - http://localhost:8082/pathinfo?test=1\n");
    
    server.run();
}

// Helper classes for the example
class User {
    public int id { get; private set; }
    public string name { get; private set; }
    public string email { get; private set; }
    
    public User(int id, string name, string email) {
        this.id = id;
        this.name = name;
        this.email = email;
    }
    
    public string to_json() {
        return @"{ \"id\": $id, \"name\": \"$name\", \"email\": \"$email\" }";
    }
}

class Post {
    public int id { get; private set; }
    public int user_id { get; private set; }
    public string title { get; private set; }
    public string content { get; private set; }
    
    public Post(int id, int user_id, string title, string content) {
        this.id = id;
        this.user_id = user_id;
        this.title = title;
        this.content = content;
    }
    
    public string to_json() {
        return @"{ \"id\": $id, \"user_id\": $user_id, \"title\": \"$title\", \"content\": \"$content\" }";
    }
}

class Item {
    public int id { get; private set; }
    public string name { get; private set; }
    public string description { get; private set; }
    public double price { get; private set; }
    
    public Item(int id, string name, string description, double price) {
        this.id = id;
        this.name = name;
        this.description = description;
        this.price = price;
    }
    
    public string to_json() {
        return @"{ \"id\": $id, \"name\": \"$name\", \"description\": \"$description\", \"price\": $price }";
    }
}

class ExampleFile {
    public string name { get; private set; }
    public string category { get; private set; }
    public string description { get; private set; }
    
    public ExampleFile(string name, string category, string description) {
        this.name = name;
        this.category = category;
        this.description = description;
    }
    
    public string to_json() {
        return @"{ \"name\": \"$name\", \"category\": \"$category\", \"description\": \"$description\" }";
    }
}