alef 0.25.3

Opinionated polyglot binding generator for Rust libraries
Documentation 
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{#- Swift app harness for server-pattern e2e tests

   This harness executable is spawned as a subprocess by the test suite's
   setUp() and runs the SUT app, registering handlers per fixture. It loads
   all fixtures, creates handlers that return expected responses, and serves
   on a configured port.

   Context variables (passed from Swift codegen):
   - fixtures_json: raw JSON string with all fixtures (auto-serialized)
   - host: binding host (e.g., "127.0.0.1")
   - port: binding port (e.g., 8009)
#}
// swift-format-ignore-file
import Foundation
#if canImport(FoundationNetworking)
import FoundationNetworking
#endif

{{ imports }}

// Load fixtures from the JSON payload.
// The fixtures dict contains per-fixture data with handler route, method, body_schema, etc.
// Split JSON across multiple lines to work around Swift compiler limits on large string literals.
{% set json = fixtures_json %}
{% set chunk_size = 30000 %}
let _FIXTURES_JSON = """
{%- for i in range((json|length + chunk_size - 1) // chunk_size) %}
{{ json[i*chunk_size:(i+1)*chunk_size] }}
{%- endfor %}
"""

guard let _fixturesData = _FIXTURES_JSON.data(using: .utf8),
      let _fixtures = try? JSONSerialization.jsonObject(with: _fixturesData) as? [String: [String: Any]] else {
    print("Failed to parse fixtures JSON")
    exit(1)
}

// Create the app.
let app = {{ app_class }}()

// Register a handler for each fixture using convenience methods.
for (fixtureId, fixtureDict) in _fixtures {
    guard let http = fixtureDict["http"] as? [String: Any] else {
        continue
    }

    guard let handler = http["handler"] as? [String: Any] else {
        continue
    }

    let route = handler["route"] as? String ?? "/"
    let methodStr = (handler["method"] as? String ?? "GET").lowercased()
    let expected = http["expected_response"] as? [String: Any] ?? [:]

    // Extract expected response values.
    let expectedStatus = expected["status_code"] as? Int ?? 200
    let expectedBody = expected["body"]
    let expectedHeaders = expected["headers"] as? [String: String] ?? [:]

    let fullRoute = "/fixtures/\(fixtureId)\(route)"

    // Create handler that returns the expected response.
    let handler_fn: (String) -> String = { _ in
        let responseDict: [String: Any] = [
            "status_code": expectedStatus,
            "{{ response_body_field }}": expectedBody as Any,
            "headers": expectedHeaders
        ]
        if let responseData = try? JSONSerialization.data(withJSONObject: responseDict, options: []),
           let responseStr = String(data: responseData, encoding: .utf8) {
            return responseStr
        }
        return "{}"
    }

    // Register the route with the handler using the convenience method for the HTTP verb.
    do {
        switch methodStr {
        case "get":     try app.get(handler_fn, path: fullRoute)
        case "post":    try app.post(handler_fn, path: fullRoute)
        case "put":     try app.put(handler_fn, path: fullRoute)
        case "patch":   try app.patch(handler_fn, path: fullRoute)
        case "delete":  try app.delete(handler_fn, path: fullRoute)
        case "head":    try app.head(handler_fn, path: fullRoute)
        case "options": try app.options(handler_fn, path: fullRoute)
        default: continue
        }
    } catch {
        print("Failed to register route \(fullRoute): \(error)")
        continue
    }
}

// Configure and start the server.
try app.config(host: "{{ host }}", port: {{ port }})
print("Harness listening on {{ host }}:{{ port }}")
fflush(stdout)
try app.run()