Let a bundle write a key with its own time to live and hear its expiry, so pulses, settles and bounds expire on the bus through the runtime (issue 1952)

go/state_test.go

@@ -3,6 +3,8 @@ package stdio
 import (
 	"bufio"
 	"encoding/json"
+	"errors"
+	"fmt"
 	"io"
 	"strings"
 	"testing"
@@ -33,6 +35,12 @@ func TestABundleKeepsAndWatchesStateThroughTheRuntime(t *testing.T) {
 				return State("servers").Put(a["key"].(string), a["value"])
 			}},
 			{Name: "recall", Run: func(a map[string]any) (any, error) { return State("servers").Get(a["key"].(string)) }},
+			{Name: "pulse", Run: func(a map[string]any) (any, error) {
+				if a["create"] == true {
+					return State("servers").CreateTTL(a["key"].(string), 1, 90*time.Second)
+				}
+				return State("servers").PutTTL(a["key"].(string), 1, 90*time.Second)
+			}},
 		}, inR, outW)
 	}()
 	lines := bufio.NewScanner(outR)
@@ -87,6 +95,15 @@ func TestABundleKeepsAndWatchesStateThroughTheRuntime(t *testing.T) {
 	if err := <-watched; err != nil {
 		t.Fatal(err)
 	}
+	// 1952 (the runtime's per-key time to live, mesh-tools 1583fa85): an expiry is handed over as its own operation.
+	send(map[string]any{"jsonrpc": "2.0", "id": 49, "method": "mesh/state", "params": map[string]any{"watch": watch["id"],
+		"change": map[string]any{"state": "servers", "key": "all.gone", "op": OpExpire}}})
+	if r := next(); r["id"] != float64(49) || r["error"] != nil {
+		t.Fatalf("an expiry was answered %v", r)
+	}
+	if s := <-seen; s != "expire all.gone " {
+		t.Fatalf("handled %q", s)
+	}
 	// A change for a watch this bundle never asked for is refused.
 	send(map[string]any{"jsonrpc": "2.0", "id": 51, "method": "mesh/state", "params": map[string]any{"watch": "bundle-999",
 		"change": map[string]any{"key": "x", "op": "put"}}})
@@ -105,6 +122,32 @@ func TestABundleKeepsAndWatchesStateThroughTheRuntime(t *testing.T) {
 	if r := next(); r["id"] != float64(2) || r["result"].(map[string]any)["content"].([]any)[0].(map[string]any)["text"] != "9" {
 		t.Fatalf("the put answered %v", r)
 	}
+	// PutTTL and CreateTTL ask the runtime's put and create with the key's time to live in whole seconds; a create the
+	// runtime refuses as changed (-32010) is ErrChanged.
+	for i, create := range []bool{false, true} {
+		send(map[string]any{"jsonrpc": "2.0", "id": 20 + i, "method": "tools/call", "params": map[string]any{"name": "pulse",
+			"arguments": map[string]any{"key": "pulse.S1", "create": create}}})
+		asked := next()
+		p := asked["params"].(map[string]any)
+		want := map[bool]string{false: "mesh/state.put", true: "mesh/state.create"}[create]
+		if asked["method"] != want || p["ttl_seconds"] != float64(90) || p["key"] != "pulse.S1" {
+			t.Fatalf("asked %v", asked)
+		}
+		if create {
+			send(map[string]any{"jsonrpc": "2.0", "id": asked["id"], "error": map[string]any{"code": CodeChanged, "message": "exists"}})
+			if r := next(); r["id"] != float64(21) || !strings.Contains(fmt.Sprint(r), "exists") {
+				t.Fatalf("a refused create answered %v", r)
+			}
+			continue
+		}
+		send(map[string]any{"jsonrpc": "2.0", "id": asked["id"], "result": map[string]any{"revision": 4}})
+		if r := next(); r["id"] != float64(20) {
+			t.Fatalf("the put answered %v", r)
+		}
+	}
+	if !errors.Is(&refused{code: CodeChanged, message: "x"}, ErrChanged) {
+		t.Fatal("a refusal coded -32010 is not ErrChanged")
+	}
 	// Get of a key with no value is nil.
 	send(map[string]any{"jsonrpc": "2.0", "id": 3, "method": "tools/call", "params": map[string]any{"name": "recall",
 		"arguments": map[string]any{"key": "nothing"}}})