mesh-host/internal/compose/resolution/several_contributions_test.go

package resolution

import (
	"encoding/json"
	"testing"

	mcat "git.novox.be/novox/mesh-sdk/go/catalogue"
)

const twoRoutes = `{"module":"minio","version":"1","requires":["route"],
  "contributes":{"route":{"api":{"label":"files-api","port":9000},"console":{"label":"files","port":9001}}}}`

func minimalRouteProxy() mcat.Manifest {
	return mcat.Manifest{Module: "route-proxy", Version: "1",
		Provides: mcat.FromAnywhere("route"),
		Receives: map[string]string{"route": "/var/lib/route-proxy/routes/mesh.json"},
	}
}

func TestAModuleWithTwoRoutesGivesTheProviderTwoContributions(t *testing.T) {
	minio, err := decodeForTest([]byte(twoRoutes))
	if err != nil {
		t.Fatal(err)
	}
	got, err := Resolve(shelf(minimalRouteProxy(), minio), []string{"route-proxy", "minio"}, workstation(), mcat.World{})
	if err != nil {
		t.Fatal(err)
	}
	out, err := Declaration(got, mcat.Rendering{})
	if err != nil {
		t.Fatal(err)
	}
	var given []mcat.Contribution
	for _, r := range out {
		if r["path"] != "/var/lib/route-proxy/routes/mesh.json" {
			continue
		}
		var parsed struct {
			Given []mcat.Contribution `json:"given"`
		}
		if err := json.Unmarshal([]byte(r["content"].(string)), &parsed); err != nil {
			t.Fatal(err)
		}
		given = parsed.Given
	}
	if len(given) != 2 {
		t.Fatalf("two named routes from one module are two contributions: %+v", given)
	}
	byPort := map[float64]string{}
	for _, g := range given {
		if g.From != "minio" {
			t.Fatalf("both contributions are minio's: %+v", g)
		}
		port, _ := g.Values["port"].(float64)
		label, _ := g.Values["label"].(string)
		byPort[port] = label
	}
	if byPort[9000] != "files-api" || byPort[9001] != "files" {
		t.Fatalf("the two routes did not both survive: %+v", given)
	}
}

// A module with the ordinary, single-contribution shape resolves exactly as it did before —
// ContributesMany being empty must change nothing about it.
func TestASingleRouteStillResolvesTheOrdinaryWay(t *testing.T) {
	got, err := Resolve(shelf(proxy(), published("board", "board", 8080)), []string{"board"}, workstation(), mcat.World{})
	if err != nil {
		t.Fatal(err)
	}
	given := received(t, mustDeclare(t, got))
	if len(given) != 1 || given[0].From != "board" {
		t.Fatalf("the plain shape regressed: %+v", given)
	}
}

// ContributionsFrom is what mints the ONE pair credential a requiring module is granted
// (cmd/mesh-controller/plan.go's grantsFor) — a separate path from Declaration()'s raw file, and
// the one the two-routes test above never exercised. Where a module contributes several times,
// there is no single "the" value: settling to whichever sorts first would both misrepresent the
// grant and collide with that same contribution's own entry from contributions(), which is
// exactly the duplicate a live plan against minio surfaced (files-api appearing once with a
// credential, once without, while files got neither).
func TestContributionsFromHasNoSingleValueWhenAModuleContributesSeveralTimes(t *testing.T) {
	minio, err := decodeForTest([]byte(twoRoutes))
	if err != nil {
		t.Fatal(err)
	}
	got, err := Resolve(shelf(minimalRouteProxy(), minio), []string{"route-proxy", "minio"}, workstation(), mcat.World{})
	if err != nil {
		t.Fatal(err)
	}
	values, asks, err := ContributionsFrom(got, "route", "minio", nil)
	if err != nil {
		t.Fatal(err)
	}
	if !asks {
		t.Fatal("minio still requires route, so it still asks")
	}
	if len(values) != 0 {
		t.Fatalf("no single value represents two contributions, got %+v", values)
	}
}

// The ordinary, single-contribution case is unchanged: exactly one match still settles to it.
func TestContributionsFromReturnsTheOneValueForAnOrdinaryContribution(t *testing.T) {
	got, err := Resolve(shelf(proxy(), published("board", "board", 8080)), []string{"board"}, workstation(), mcat.World{})
	if err != nil {
		t.Fatal(err)
	}
	values, asks, err := ContributionsFrom(got, "reverse-proxy", "board", nil)
	if err != nil {
		t.Fatal(err)
	}
	if !asks || values["host"] != "board" {
		t.Fatalf("the ordinary single contribution should still settle to its own value: %+v", values)
	}
}