mesh-delivery/modules/mesh-delivery-checker/manifest_test.go

package manifest

import (
	"bytes"
	"encoding/json"
	"io/fs"
	"os"
	"path/filepath"
	"reflect"
	"slices"
	"strings"
	"testing"
)

// The controller's manifest reader is mesh-controller internal/catalogue (Manifest, manifest.go: Consumes :521,
// Invokes :590, Streams :613, Reads :659; StreamDeclaration, streams.go), an internal package of another repository.
// These tests decode the manifest strictly into the fields those types name (DisallowUnknownFields) and hold the
// rules of issues 1678 and 1683 (ADR 0453 §4, ADR 0484). The merge gate's module check proves the controller takes the manifest.

type state struct {
	Name    string `json:"name"`
	History int    `json:"history,omitempty"`
}

type artifact struct {
	Name     string   `json:"name"`
	Kind     string   `json:"kind"`
	Language string   `json:"language"`
	System   string   `json:"system"`
	From     string   `json:"from"`
	Binary   string   `json:"binary"`
	Loads    []string `json:"loads"`
}

type stream struct {
	Name   string   `json:"name"`
	Events []string `json:"events"`
}

type manifest struct {
	Streams  []stream `json:"streams"`
	Tools    []string `json:"tools"`
	Module   string   `json:"module"`
	Version  string   `json:"version"`
	Slug     string   `json:"slug"`
	Consumes []string `json:"consumes"`
	State    []state  `json:"state"`
	Reads    []string `json:"reads"`
	Invokes  []string `json:"invokes"`
	Config   map[string]struct {
		Type        string `json:"type"`
		Description string `json:"description"`
		Pattern     string `json:"pattern"`
		Default     string `json:"default"`
	} `json:"config"`
	OwnSecrets   map[string]string `json:"own-secrets"`
	SecretsOwner string            `json:"secrets-owner"`
	Resources    []map[string]any  `json:"resources"`
	Build        struct {
		Artifacts []artifact `json:"artifacts"`
	} `json:"build"`
}

func load(t *testing.T) (manifest, map[string]json.RawMessage) {
	t.Helper()
	raw, err := os.ReadFile("module.json")
	if err != nil {
		t.Fatal(err)
	}
	var m manifest
	dec := json.NewDecoder(bytes.NewReader(raw))
	dec.DisallowUnknownFields()
	if err := dec.Decode(&m); err != nil {
		t.Fatalf("the controller's reader refuses a key this manifest has: %v", err)
	}
	var top map[string]json.RawMessage
	if err := json.Unmarshal(raw, &top); err != nil {
		t.Fatal(err)
	}
	return m, top
}

func sorted(s []string) []string {
	s = slices.Clone(s)
	slices.Sort(s)
	return s
}

func TestManifestDeclarations(t *testing.T) { // 1678/AC1
	m, top := load(t)
	if m.Module != "mesh-delivery-checker" {
		t.Errorf("module = %q", m.Module)
	}
	// delivery.CheckerKeptHistory, CheckerOwedHistory, PreviewsHistory, CheckerVerdictsHistory; the names follow the SDK's buckets.
	if want := []state{{Name: "kept", History: 1}, {Name: "owed", History: 5}, {Name: "previews", History: 5}, {Name: "tries", History: 1}, {Name: "verdicts", History: 5}}; !reflect.DeepEqual(m.State, want) {
		t.Errorf("state = %+v, want %+v", m.State, want)
	}
	if want := []string{"mesh-build-go.steps", "mesh-build-go.toolchains", "mesh-build-node.steps", "mesh-build-node.toolchains",
		"mesh-controller.plans-building", "mesh-delivery-builder.builds", "mesh-delivery-gate.source", "mesh-delivery-indexer.candidates",
		"mesh-delivery-indexer.manifests", "mesh-delivery-indexer.modules", "mesh-delivery-watchman.presence", "node-engine.have"}; !reflect.DeepEqual(sorted(m.Reads), want) {
		t.Errorf("reads = %v, want %v", m.Reads, want)
	}
	if want := []string{"gitea.gitea_commits", "gitea.gitea_compare", "gitea.gitea_get_file", "mesh-build-go.build_go_digest", "mesh-build-go.build_go_fetch", "mesh-build-go.build_go_test", "mesh-build-node.build_node_fetch", "mesh-build-node.build_node_test"}; !reflect.DeepEqual(sorted(m.Invokes), want) {
		t.Errorf("invokes = %v, want only the build modules' fetch, digest and test (no run step before issue 1309, ADR 0484 clause 5) and the forge's two reads for a mesh-sdk pin (clause 9)", m.Invokes)
	}
	// The checker is woken by a build module's report of a toolchain, as the indexer is: the bucket may not exist when it starts.
	if want := []string{"mesh-build-go.toolchain.reported", "mesh-build-node.toolchain.reported"}; !reflect.DeepEqual(sorted(m.Consumes), want) {
		t.Errorf("consumes = %v, want %v", m.Consumes, want)
	}
	if b, ok := m.OwnSecrets["broker"]; !ok || len(m.OwnSecrets) != 1 || b != "${dir:state}/broker" {
		t.Errorf("own-secrets = %v, want exactly broker", m.OwnSecrets)
	}
	if m.SecretsOwner != "mesh-delivery-checker" {
		t.Errorf("secrets-owner = %q", m.SecretsOwner)
	}
	// The checker says each time it wrote a preview or a status, so the indexer's and the forge bridge's watches find the buckets (ADR 0484 clauses 2 and 3).
	if want := []stream{{Name: "checks", Events: []string{"preview.**", "owed.**"}}}; !reflect.DeepEqual(m.Streams, want) {
		t.Errorf("streams = %+v, want %+v", m.Streams, want)
	}
	// The read tools (issue 1686) are served by the tools bundle, not by the checker's process.
	// The try's two tools (ADR 0501 §5) beside them: mesh-controller's try calls them.
	if want := []string{"checker_kept", "checker_previews", "checker_pull", "checker_status", "checker_try", "checker_try_read", "checker_verdicts"}; !reflect.DeepEqual(sorted(m.Tools), want) {
		t.Errorf("tools = %v, want %v", m.Tools, want)
	}
	for _, k := range []string{"logs", "emits", "claims", "provides", "requires", "uses", "defines-seats", "seat", "seats", "bus"} {
		if _, ok := top[k]; ok {
			t.Errorf("the manifest declares %q: the checker has none", k)
		}
	}
}

func TestManifestProcess(t *testing.T) { // 1678/AC1
	m, _ := load(t)
	var procs []map[string]any
	for _, r := range m.Resources {
		if r["type"] == "process" {
			procs = append(procs, r)
		}
		if r["type"] == "tool" || r["type"] == "seat" {
			t.Errorf("resource %v: the checker serves no tool and holds no seat", r)
		}
	}
	if len(procs) != 1 {
		t.Fatalf("%d process resources, want one", len(procs))
	}
	p := procs[0]
	if p["artifact"] != "program" || !reflect.DeepEqual(p["run"], []any{"./mesh-delivery-checker"}) {
		t.Errorf("process = %v", p)
	}
	env, _ := p["env"].(map[string]any)
	// The capacity of each node is the module's setting `capacity` (ADR 0484 clause 12, as the builder's, issue 1661), laid into the
	// settings file the program reads; empty is one step at a time everywhere. The environment holds no capacity.
	if len(env) != 2 || env["MESH_BROKER_FILE"] != "${dir:state}/broker" || env["MESH_CHECKER_SETTINGS"] != "${dir:state}/settings.json" {
		t.Errorf("env = %v", p["env"])
	}
	if !reflect.DeepEqual(p["restart-on"], []any{"settings"}) {
		t.Errorf("restart-on = %v, want the settings file, so a changed capacity reaches the running program", p["restart-on"])
	}
	c, ok := m.Config["capacity"]
	if !ok || len(m.Config) != 1 || c.Type != "string" || c.Default != "" || c.Description == "" {
		t.Errorf("config = %+v, want one string setting, capacity, empty (one step at a time on every node) to start", m.Config)
	}
	var settings map[string]any
	for _, r := range m.Resources {
		if r["id"] == "settings" {
			settings = r
		}
	}
	if settings == nil || settings["type"] != "file" || settings["merge"] != "json" || !reflect.DeepEqual(settings["takes-config"], []any{"capacity"}) || settings["path"] != "${dir:state}/settings.json" {
		t.Errorf("settings resource = %v", settings)
	}
	if raw, err := os.ReadFile("files/settings.json"); err != nil || !strings.Contains(string(raw), `"capacity": ""`) {
		t.Errorf("files/settings.json = %q, %v, want the setting's starting value", raw, err)
	}
	if _, bus := p["bus"]; bus {
		t.Errorf("the process declares a bus: it runs on its own broker credential")
	}
	if len(m.Build.Artifacts) != 3 || m.Build.Artifacts[2].Name != "files" || m.Build.Artifacts[2].Kind != "archive" || m.Build.Artifacts[2].From != "files" {
		t.Fatalf("artifacts = %+v, want the program, the tools and the files", m.Build.Artifacts)
	}
	if a := m.Build.Artifacts[1]; a.Name != "tools" || a.Kind != "bundle" || a.Language != "go" || a.Binary != "mesh-delivery-checker-tools" ||
		!reflect.DeepEqual(a.Loads, []string{"mesh-delivery-checker-tools"}) {
		t.Errorf("tools artifact = %+v", a)
	}
	if st, err := os.Stat(m.Build.Artifacts[1].From); err != nil || !st.IsDir() {
		t.Errorf("the tools' source %s: %v", m.Build.Artifacts[1].From, err)
	}
	a := m.Build.Artifacts[0]
	if st, err := os.Stat(a.From); err != nil || !st.IsDir() || a.Binary != "mesh-delivery-checker" || !strings.HasSuffix(a.From, a.Binary) || a.Kind != "bundle" || a.Language != "go" {
		t.Errorf("artifact = %+v", a)
	}
}

func TestServesNoRequestSubjectAndHoldsNoTicker(t *testing.T) { // 1678/AC6 (ADR 0437 §8: no timer, a wait is a context's bound)
	forbidden := []string{"Subscribe(", "QueueSubscribe", "ChanSubscribe", "time.NewTicker", "time.Tick", "time.NewTimer", "time.AfterFunc", "time.After(", "time.Sleep"}
	var files int
	for _, root := range []string{"cmd", "internal"} {
		err := filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
			if err != nil || d.IsDir() || !strings.HasSuffix(path, ".go") || strings.HasSuffix(path, "_test.go") {
				return err
			}
			files++
			src, err := os.ReadFile(path)
			if err != nil {
				return err
			}
			for _, f := range forbidden {
				if strings.Contains(string(src), f) {
					t.Errorf("%s holds %s: the checker serves no request subject and holds no timer", path, f)
				}
			}
			return nil
		})
		if err != nil {
			t.Fatal(err)
		}
	}
	if files < 1 {
		t.Fatalf("read %d source files, want the program's", files)
	}
}