mesh-sdk/go/packages_list_test.go

package stdio

import (
	"encoding/json"
	"go/ast"
	"go/parser"
	"go/token"
	"io/fs"
	"path/filepath"
	"reflect"
	"slices"
	"strconv"
	"strings"
	"testing"

	"git.novox.be/novox/mesh-sdk/go/buscalls"
)

// meshSDKPackages is every package mesh-sdk holds (novox/hq ADR 0593 §1): what every module shares, the value shapes
// and names more than one part reads, and the seat contracts it holds until they move into SDK modules (issue 167).
// Logic only some modules need is its owner module's package. A package added here is a decision to say in the pull
// request: does every module share it, or is it a shape more than one part reads?
var meshSDKPackages = []string{
	".", "announce", "announcetest", "asker", "asks", "buildstep", "buscalls", "buscompose", "busretry", "calladdress", "catalogue",
	"composer", "declaration", "delivery", "forgekey", "handacts", "health", "internal/beside", "kvlimit", "membership",
	"objectlink", "outward", "overlay", "pernode", "process", "provider", "provider/harness", "provisions",
	"sdkversion", "seal", "testbus",
}

// computesNot are the functions whose computation is one owner's alone (ADR 0593 §2, §7): the indexer computes a
// fingerprint, its named tree and a package's version; the node-engine composes.
var computesNot = []string{"SourceFingerprint", "SourceFingerprint2", "NamedTree", "MeshPackagesOf", "PackageVersionsOf",
	"OtherPackages", "Compose", "CompositionsShadow", "JudgeMove", "Run"}

// composesNot are the methods of the composition, the node-engine's alone since its rules moved there (ADR 0593 §7):
// mesh-sdk renders no declaration and refuses no composition.
var composesNot = []string{"Resolution.Compose", "Resolution.Declaration", "Resolution.Rules", "Resolution.LeftOut"}

// ADR 0593 §1's check: mesh-sdk holds exactly the packages it keeps, and none of them computes what one owner alone
// computes.
func TestMeshSDKHoldsOnlyWhatEveryModuleShares(t *testing.T) {
	var found []string
	err := filepath.WalkDir(".", func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() {
			if n := d.Name(); n == "testdata" || (strings.HasPrefix(n, ".") && path != ".") {
				return filepath.SkipDir
			}
			return nil
		}
		if !strings.HasSuffix(path, ".go") || strings.HasSuffix(path, "_test.go") {
			return nil
		}
		dir := filepath.ToSlash(filepath.Dir(path))
		if !slices.Contains(found, dir) {
			found = append(found, dir)
		}
		file, err := parser.ParseFile(token.NewFileSet(), path, nil, parser.SkipObjectResolution)
		if err != nil {
			return err
		}
		// 1966/AC5: the calls package imports nothing of mesh-sdk but the catalogue's types, so a change here rebuilds
		// only its importers (ADR 0595 §9).
		if dir == "buscalls" {
			for _, imp := range file.Imports {
				p, _ := strconv.Unquote(imp.Path.Value)
				if strings.HasPrefix(p, sdkModule) && p != sdkModule+"/catalogue" {
					t.Errorf("%s imports %s: the calls package imports nothing of mesh-sdk but catalogue (ADR 0595 §9)", path, p)
				}
			}
		}
		for _, decl := range file.Decls {
			fn, ok := decl.(*ast.FuncDecl)
			if !ok {
				continue
			}
			if fn.Recv == nil && slices.Contains(computesNot, fn.Name.Name) {
				t.Errorf("%s: %s computes what its owner alone computes (ADR 0593 §2, §7)", path, fn.Name.Name)
			}
			if fn.Recv != nil {
				recv := fn.Recv.List[0].Type
				if star, isStar := recv.(*ast.StarExpr); isStar {
					recv = star.X
				}
				if id, isID := recv.(*ast.Ident); isID && slices.Contains(composesNot, id.Name+"."+fn.Name.Name) {
					t.Errorf("%s: %s.%s composes, which the node-engine alone does (ADR 0593 §7)", path, id.Name, fn.Name.Name)
				}
			}
		}
		return nil
	})
	if err != nil {
		t.Fatal(err)
	}
	slices.Sort(found)
	for _, dir := range found {
		if !slices.Contains(meshSDKPackages, dir) {
			t.Errorf("mesh-sdk holds the package %s, which it does not keep (ADR 0593 §1): it is its owner module's package", dir)
		}
	}
	for _, want := range meshSDKPackages {
		if !slices.Contains(found, want) {
			t.Errorf("mesh-sdk's list keeps %s, which is gone: take it off the list", want)
		}
	}

	// 1966/AC5: the call an apply names is the id the tool runner hands under `_meta`'s mesh/call.
	if buscalls.MetaCall != "mesh/call" {
		t.Errorf("the tool call's id is handed under %q, not mesh/call", buscalls.MetaCall)
	}
	// 1966/AC5: an index's key is its fields' values, then the instance's path, joined by "."; its entry names the
	// instance and the sequence.
	for _, c := range []struct {
		fields   []string
		instance string
		want     string
	}{
		{[]string{"17950", "volvo"}, "listing/a17", "17950.volvo.listing.a17"},
		// A value holding "." and one that does not meet in no key.
		{[]string{"a.b"}, "c", "a=2Eb.c"},
		{[]string{"a"}, "b/c", "a.b.c"},
		// A title with spaces is a token the bus takes; "=" itself is encoded.
		{[]string{"How it is checked", "x=y"}, "decision/0290", "How=20it=20is=20checked.x=3Dy.decision.0290"},
	} {
		k := buscalls.IndexKey(c.fields, c.instance)
		if k != c.want {
			t.Errorf("the index key of %q and %q is %q, want %q", c.fields, c.instance, k, c.want)
		}
		for _, token := range strings.Split(k, ".") {
			if token == "" || strings.ContainsAny(token, " *>\t") {
				t.Errorf("the index key %q holds a token the bus refuses: %q", k, token)
			}
		}
	}
	if buscalls.IndexKey([]string{"a.b"}, "c") == buscalls.IndexKey([]string{"a"}, "b/c") {
		t.Error("two different index keys meet")
	}
	entry, _ := json.Marshal(buscalls.IndexEntry{Instance: "listing/a17", Sequence: 3})
	if string(entry) != `{"instance":"listing/a17","sequence":3}` {
		t.Errorf("an index entry is %s", entry)
	}
	// 1966/AC5: an apply naming the tool call it serves, and its answer with the state behind, round-trip.
	for _, c := range []struct {
		name     string
		in, back any
	}{
		{"apply", &buscalls.ApplyRequest{Ledger: "records", Instance: "decision/0290", Operation: "submit",
			Body: json.RawMessage(`{"why":"x"}`), Call: "call-17"}, &buscalls.ApplyRequest{}},
		{"applied", &buscalls.Applied{Taken: true, Sequence: 5, StateBehind: true}, &buscalls.Applied{}},
	} {
		raw, err := json.Marshal(c.in)
		if err != nil {
			t.Fatal(err)
		}
		if err := json.Unmarshal(raw, c.back); err != nil || !reflect.DeepEqual(c.in, c.back) {
			t.Errorf("%s read back as %+v from %s (%v)", c.name, c.back, raw, err)
		}
	}
}

// sdkModule is mesh-sdk's Go module path.
const sdkModule = "git.novox.be/novox/mesh-sdk/go"