feat(engine): run modules through Detect/Plan/Apply/Verify with DAG + skip-on-failure

This commit is contained in:
MDietermann
2026-04-13 19:49:52 +02:00
parent 37761e017e
commit 94c7084ec3
2 changed files with 335 additions and 0 deletions

189
internal/engine/engine.go Normal file
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@@ -0,0 +1,189 @@
package engine
import (
"context"
"errors"
"fmt"
"sort"
"github.com/MDietermann/ArduinoArchSetup/internal/module"
)
// RunOptions controls a single engine run.
type RunOptions struct {
Selected []string // module IDs to run; empty = all
DryRun bool // Detect + Plan only, no Apply/Verify
HaltOnError bool // stop at first failure instead of continuing siblings
Reporter module.Reporter
}
// ModuleStatus is the terminal state of a module within a run.
type ModuleStatus string
const (
StatusSucceeded ModuleStatus = "succeeded"
StatusFailed ModuleStatus = "failed"
StatusSkipped ModuleStatus = "skipped"
StatusPlanned ModuleStatus = "planned" // dry-run only
)
// ModuleResult captures what happened for one module.
type ModuleResult struct {
ID string
Status ModuleStatus
Plan module.Plan
Err error
}
// Summary aggregates results.
type Summary struct {
Results []ModuleResult
}
// Counts returns (succeeded, failed, skipped).
func (s Summary) Counts() (int, int, int) {
var ok, fail, skip int
for _, r := range s.Results {
switch r.Status {
case StatusSucceeded, StatusPlanned:
ok++
case StatusFailed:
fail++
case StatusSkipped:
skip++
}
}
return ok, fail, skip
}
// Run drives the selected modules through the four phases in DAG order.
// Parallelism is intentionally omitted in this foundation; a later plan
// will introduce it. Sequential execution is a correct baseline.
func Run(ctx context.Context, reg *module.Registry, opts RunOptions) (Summary, error) {
mods, err := resolveSelection(reg, opts.Selected)
if err != nil {
return Summary{}, err
}
metas := make([]module.Meta, 0, len(mods))
for _, m := range mods {
metas = append(metas, m.Meta())
}
order, err := TopoSort(metas)
if err != nil {
return Summary{}, fmt.Errorf("module graph: %w", err)
}
byID := make(map[string]module.Module, len(mods))
for _, m := range mods {
byID[m.Meta().ID] = m
}
results := make(map[string]*ModuleResult, len(mods))
failed := make(map[string]bool)
skipped := make(map[string]bool)
for _, id := range order {
if skipped[id] {
results[id] = &ModuleResult{ID: id, Status: StatusSkipped, Err: errors.New("skipped: upstream failed")}
continue
}
m := byID[id]
res := &ModuleResult{ID: id}
results[id] = res
state, err := m.Detect(ctx)
if err != nil {
res.Status = StatusFailed
res.Err = fmt.Errorf("detect: %w", err)
markFailed(metas, id, failed, skipped)
if opts.HaltOnError {
break
}
continue
}
plan, err := m.Plan(ctx, state)
if err != nil {
res.Status = StatusFailed
res.Err = fmt.Errorf("plan: %w", err)
markFailed(metas, id, failed, skipped)
if opts.HaltOnError {
break
}
continue
}
res.Plan = plan
if opts.DryRun {
res.Status = StatusPlanned
continue
}
if err := m.Apply(ctx, plan, opts.Reporter); err != nil {
res.Status = StatusFailed
res.Err = fmt.Errorf("apply: %w", err)
markFailed(metas, id, failed, skipped)
if opts.HaltOnError {
break
}
continue
}
if err := m.Verify(ctx); err != nil {
res.Status = StatusFailed
res.Err = fmt.Errorf("verify: %w", err)
markFailed(metas, id, failed, skipped)
if opts.HaltOnError {
break
}
continue
}
res.Status = StatusSucceeded
}
summary := Summary{}
// Emit results in topo order for stable output.
ids := make([]string, 0, len(results))
for id := range results {
ids = append(ids, id)
}
sort.SliceStable(ids, func(i, j int) bool {
return indexOf(order, ids[i]) < indexOf(order, ids[j])
})
for _, id := range ids {
summary.Results = append(summary.Results, *results[id])
}
return summary, nil
}
func resolveSelection(reg *module.Registry, selected []string) ([]module.Module, error) {
all := reg.All()
if len(selected) == 0 {
return all, nil
}
out := make([]module.Module, 0, len(selected))
for _, id := range selected {
m, ok := reg.Get(id)
if !ok {
return nil, fmt.Errorf("unknown module %q", id)
}
out = append(out, m)
}
return out, nil
}
func markFailed(metas []module.Meta, id string, failed, skipped map[string]bool) {
failed[id] = true
for d := range Descendants(metas, id) {
skipped[d] = true
}
}
func indexOf(s []string, v string) int {
for i, x := range s {
if x == v {
return i
}
}
return -1
}

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package engine
import (
"context"
"errors"
"testing"
"github.com/MDietermann/ArduinoArchSetup/internal/module"
)
// scriptedModule lets tests control what each phase returns.
type scriptedModule struct {
id string
deps []string
detect func() (module.State, error)
plan func() (module.Plan, error)
apply func() error
verify func() error
}
func (s scriptedModule) Meta() module.Meta { return module.Meta{ID: s.id, Name: s.id, Deps: s.deps} }
func (s scriptedModule) Detect(ctx context.Context) (module.State, error) {
if s.detect != nil {
return s.detect()
}
return nil, nil
}
func (s scriptedModule) Plan(ctx context.Context, _ module.State) (module.Plan, error) {
if s.plan != nil {
return s.plan()
}
return module.Plan{}, nil
}
func (s scriptedModule) Apply(ctx context.Context, _ module.Plan, _ module.Reporter) error {
if s.apply != nil {
return s.apply()
}
return nil
}
func (s scriptedModule) Verify(ctx context.Context) error {
if s.verify != nil {
return s.verify()
}
return nil
}
func newReg(t *testing.T, mods ...module.Module) *module.Registry {
t.Helper()
r := module.NewRegistry()
for _, m := range mods {
if err := r.Register(m); err != nil {
t.Fatal(err)
}
}
return r
}
func TestRunAllSucceed(t *testing.T) {
reg := newReg(t,
scriptedModule{id: "a"},
scriptedModule{id: "b", deps: []string{"a"}},
)
sum, err := Run(context.Background(), reg, RunOptions{Reporter: NewBufferedReporter()})
if err != nil {
t.Fatal(err)
}
ok, fail, skip := sum.Counts()
if ok != 2 || fail != 0 || skip != 0 {
t.Fatalf("counts = (%d,%d,%d)", ok, fail, skip)
}
if sum.Results[0].ID != "a" || sum.Results[1].ID != "b" {
t.Fatalf("order = %v", sum.Results)
}
}
func TestRunDryRunDoesNotApply(t *testing.T) {
applied := false
reg := newReg(t, scriptedModule{
id: "a",
apply: func() error { applied = true; return nil },
})
sum, err := Run(context.Background(), reg, RunOptions{DryRun: true, Reporter: NewBufferedReporter()})
if err != nil {
t.Fatal(err)
}
if applied {
t.Fatal("Apply was called during dry-run")
}
if sum.Results[0].Status != StatusPlanned {
t.Fatalf("status = %v", sum.Results[0].Status)
}
}
func TestRunFailureSkipsDescendantsContinuesSiblings(t *testing.T) {
reg := newReg(t,
scriptedModule{id: "root"},
scriptedModule{id: "fails", deps: []string{"root"}, apply: func() error { return errors.New("boom") }},
scriptedModule{id: "child", deps: []string{"fails"}},
scriptedModule{id: "sibling", deps: []string{"root"}},
)
sum, err := Run(context.Background(), reg, RunOptions{Reporter: NewBufferedReporter()})
if err != nil {
t.Fatal(err)
}
status := map[string]ModuleStatus{}
for _, r := range sum.Results {
status[r.ID] = r.Status
}
if status["root"] != StatusSucceeded {
t.Errorf("root = %v", status["root"])
}
if status["fails"] != StatusFailed {
t.Errorf("fails = %v", status["fails"])
}
if status["child"] != StatusSkipped {
t.Errorf("child = %v", status["child"])
}
if status["sibling"] != StatusSucceeded {
t.Errorf("sibling = %v (should have run)", status["sibling"])
}
}
func TestRunHaltOnError(t *testing.T) {
reg := newReg(t,
scriptedModule{id: "a", apply: func() error { return errors.New("nope") }},
scriptedModule{id: "b"}, // independent
)
sum, err := Run(context.Background(), reg, RunOptions{HaltOnError: true, Reporter: NewBufferedReporter()})
if err != nil {
t.Fatal(err)
}
// "b" should not appear in results because we halted before reaching it.
for _, r := range sum.Results {
if r.ID == "b" {
t.Fatalf("b was run despite HaltOnError")
}
}
}
func TestRunUnknownModule(t *testing.T) {
reg := module.NewRegistry()
_, err := Run(context.Background(), reg, RunOptions{Selected: []string{"ghost"}})
if err == nil {
t.Fatal("expected error for unknown module")
}
}