From 0f0ed437d93d0dc2ff817351f288dc9b959a43b8 Mon Sep 17 00:00:00 2001
From: Helmut Merz <helmutm@cy55.de>
Date: Sat, 3 Jun 2023 14:49:35 +0200
Subject: [PATCH] work in progress: use go routines for app (and testing)

---
 common/common.go     | 56 +++++++++++++++++++++++++++++++++++++-------
 scopes.go            | 35 +++++++++++++++++++++++++++
 testing/testing.go   | 19 ++++++++++++++-
 tests/scopes_test.go |  8 +++++++
 4 files changed, 109 insertions(+), 9 deletions(-)

diff --git a/common/common.go b/common/common.go
index 78eeb81..22ab41c 100644
--- a/common/common.go
+++ b/common/common.go
@@ -1,5 +1,7 @@
 package common
 
+import "sync"
+
 type Config interface {
 	Name() string
 	Starter() StartFct
@@ -7,6 +9,8 @@ type Config interface {
 	Add(Config)
 }
 
+type Message interface{}
+
 type Services map[string]Context
 
 type ContextState interface{}
@@ -18,6 +22,9 @@ type Context interface {
 	ChildContext(Config) Context
 	State() ContextState
 	WithState(ContextState) Context
+	Mailbox() chan Message
+	Done() chan struct{}
+	WaitGroup() *sync.WaitGroup
 }
 
 type StartFct = func(Context)
@@ -29,6 +36,7 @@ type context struct {
 	parent   Context
 	children []Context
 	state    ContextState
+	mailbox  chan Message
 }
 
 func (ctx *context) Config() Config {
@@ -59,10 +67,23 @@ func (ctx *context) WithState(state ContextState) Context {
 	return ctx
 }
 
+func (ctx *context) Mailbox() chan Message {
+	return ctx.mailbox
+}
+
+func (ctx *context) WaitGroup() *sync.WaitGroup {
+	return ctx.parent.WaitGroup()
+}
+
+func (ctx *context) Done() chan struct{} {
+	return ctx.parent.Done()
+}
+
 func makeCtx(cfg Config, parent Context) *context {
 	return &context{
-		cfg:    cfg,
-		parent: parent,
+		cfg:     cfg,
+		parent:  parent,
+		mailbox: make(chan Message, 10),
 	}
 }
 
@@ -70,7 +91,9 @@ func makeCtx(cfg Config, parent Context) *context {
 
 type appContext struct {
 	*context
-	services Services
+	services  Services
+	waitgroup *sync.WaitGroup
+	doneCh    chan struct{}
 }
 
 func (ctx *appContext) ChildContext(cfg Config) Context {
@@ -84,9 +107,26 @@ func (ctx *appContext) Services() Services {
 	return ctx.services
 }
 
-func AppContext(cfg Config) Context {
-	return &appContext{
-		context:  makeCtx(cfg, nil),
-		services: Services{},
-	}
+func (ctx *appContext) WithState(state ContextState) Context {
+	ctx.state = state
+	return ctx
+}
+
+func (ctx *appContext) WaitGroup() *sync.WaitGroup {
+	return ctx.waitgroup
+}
+
+func (ctx *appContext) Done() chan struct{} {
+	return ctx.doneCh
+}
+
+func AppContext(cfg Config) Context {
+	ctx := &appContext{
+		context:   makeCtx(cfg, nil),
+		services:  Services{},
+		waitgroup: &sync.WaitGroup{},
+		doneCh:    make(chan struct{}),
+	}
+	ctx.services[cfg.Name()] = ctx
+	return ctx
 }
diff --git a/scopes.go b/scopes.go
index 7a27e0f..b864a4c 100644
--- a/scopes.go
+++ b/scopes.go
@@ -1,6 +1,11 @@
 package scopes
 
 import (
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+
 	"git.sr.ht/~cco/go-scopes/common"
 	"git.sr.ht/~cco/go-scopes/config"
 )
@@ -15,7 +20,37 @@ func Start(ctx common.Context) {
 	for _, cfg := range ctx.Config().Children() {
 		cctx := ctx.ChildContext(cfg)
 		cfg.Starter()(cctx)
+		fmt.Println(cfg.Name(), " started")
 	}
+	fmt.Println("running ", ctx.WaitGroup())
+	defer func() {
+		close(ctx.Done())
+		ctx.WaitGroup().Wait()
+		fmt.Println("finishing ", ctx.WaitGroup())
+		//ctx.LogDebug("Dispatcher exited", m.Map{})
+	}()
+	sig := make(chan os.Signal, 1)
+	signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
+	for step(ctx, sig) {
+	}
+}
+
+func step(ctx common.Context, sig <-chan os.Signal) bool {
+	select {
+	case <-sig:
+		fmt.Println("interrupted")
+		//ctx.LogInfo("Dispatcher interrupted", m.Map{})
+		return false
+	case msg := <-ctx.Mailbox():
+		fmt.Println("message", msg)
+		//ctx.LogDebug("dispatcherStep", m.Map{"msg": msg})
+		if msg == "quit" {
+			//ctx.LogInfo("Dispatcher stopped", m.Map{})
+			return false
+		}
+		//ctx.HandleMsg(&msg)
+	}
+	return true
 }
 
 // definitions
diff --git a/testing/testing.go b/testing/testing.go
index 826c7d4..87510fd 100644
--- a/testing/testing.go
+++ b/testing/testing.go
@@ -3,15 +3,22 @@
 package testing
 
 import (
+	"fmt"
 	"regexp"
 	"testing"
+	"time"
 
 	"git.sr.ht/~cco/go-scopes"
 	"git.sr.ht/~cco/go-scopes/common"
 )
 
 func Start(ctx common.Context) {
-	scopes.Start(ctx)
+	ctx.WaitGroup().Add(1)
+	go func() {
+		scopes.Start(ctx)
+		ctx.WaitGroup().Done()
+	}()
+	time.Sleep(100 * time.Millisecond)
 }
 
 // definitions
@@ -41,6 +48,16 @@ func SetUpApp(tbase *testing.T, cfg common.Config) *T {
 	return t
 }
 
+func (t *T) TearDownApp() {
+	// give actors time to recieve all messages:
+	time.Sleep(100 * time.Millisecond)
+	//t.Check()
+	t.Ctx.Services()["testing"].Mailbox() <- "quit"
+	fmt.Println("teardown ", t.Ctx.WaitGroup())
+	//t.Ctx.WaitGroup().Wait()
+	//t.AssertNoUncheckedMessages()
+}
+
 // testing methods
 
 func (t *T) Run(name string, f func(*T)) bool {
diff --git a/tests/scopes_test.go b/tests/scopes_test.go
index 4adedf6..97ed977 100644
--- a/tests/scopes_test.go
+++ b/tests/scopes_test.go
@@ -1,6 +1,7 @@
 package scopes_test
 
 import (
+	"fmt"
 	tbase "testing"
 
 	"git.sr.ht/~cco/go-scopes"
@@ -10,7 +11,14 @@ import (
 
 func TestConfig(tb *tbase.T) {
 	t := testing.SetUpApp(tb, etc.Config())
+	t.Run("testing", TestingTest)
 	t.Run("config", ConfigTest)
+	t.TearDownApp()
+}
+
+func TestingTest(t *testing.T) {
+	ctx := t.Ctx
+	fmt.Println(ctx.Services())
 }
 
 func ConfigTest(t *testing.T) {