mesh-sdk/go/catalogue/endpoint_test.go

package catalogue

import (
	"testing"
)

// aMediaServer is the shape one port number per key cannot express: two endpoints of different kinds.
// A web surface a proxy serves under a subdomain, and a protocol port clients dial directly because
// the client expects that number.
func aMediaServer() Manifest {
	return Manifest{
		Module: "media",
		Listens: []Listening{
			{Name: "web", Port: 80, From: FromMesh, Why: "the app, behind the proxy"},
			{Name: "stream", Port: 32400, From: FromEverywhere, Fixed: true,
				Why: "the client dials this number; the protocol chose it"},
		},
		Contributes: map[string]map[string]any{
			"route": {"label": "media", RouteEndpoint: "web"},
		},
		// Both endpoints are published by its container, which is what lets a machine port be given
		// for either: the mesh moves a port the module publishes, never one it merely listens on.
		Resources: []map[string]any{
			{"id": "server", "type": "container", "name": "media",
				"ports": []any{"80", "32400"}},
		},
	}
}

// **A route names the endpoint it serves.** A route and a listen both carried a port and nothing said
// they were the same thing; now one of them says so.
func TestARouteNamesTheEndpointItServes(t *testing.T) {
	m := aMediaServer()
	if port, ok := EndpointPort(m, "web"); !ok || port != 80 {
		t.Fatalf("the web endpoint resolves to %d (%v), want 80", port, ok)
	}
	if port, ok := EndpointPort(m, "stream"); !ok || port != 32400 {
		t.Fatalf("the stream endpoint resolves to %d (%v), want 32400", port, ok)
	}
	if _, ok := EndpointPort(m, "absent"); ok {
		t.Fatal("an endpoint the module does not declare resolved to a port")
	}
}