mutation proof of concept

client can now send mutations and server properly executes them
TODO: implement query execution, add auth, add storage

context.go

@@ -10,9 +10,11 @@ type AuthCtx struct {
 type QueryCtx struct {
 	DB      *gorm.DB
 	AuthCtx *AuthCtx
+	Params  map[string]interface{}
 }
 
 type MutationCtx struct {
 	DB      *gorm.DB
 	AuthCtx *AuthCtx
+	Params  map[string]interface{}
 }

engine.go

@@ -1,7 +1,6 @@
 package tether
 
 import (
-	"encoding/json"
 	"log/slog"
 	"net/http"
 
@@ -53,17 +52,32 @@ func (e *Engine) OnDisconnect(clientID string) error {
 	return nil
 }
 
+func (e *Engine) ExecuteQuery(query string) (interface{}, error) {
+	/*
+		TODO: implement the logic to execute the query
+		Steps needed:
+		1. Check which tables updated
+		2. Get the queries that rely on the tables
+		3. Get the subscriptions that need updating
+		4. Calculate hash for every query
+		5. Send the updated queries if hash changed
+	*/
+	return nil, nil
+}
+
+func (e *Engine) ExecuteMutation(mutation string, params map[string]interface{}) (interface{}, error) {
+	result := e.mutations[mutation](&MutationCtx{DB: e.db, AuthCtx: &AuthCtx{UserID: "", IsLoggedIn: true}, Params: params})
+	return result, nil
+}
+
 func (e *Engine) OnReceiveMessage(clientID string, msg map[string]interface{}) error {
 	slog.Debug("Received message", "from", clientID, "message", msg)
-	message, err := json.Marshal(map[string]interface{}{
-		"type":     "query",
-		"location": msg["query"],
-		"data":     "test",
-	})
-	if err != nil {
-		slog.Error("Failed to marshal message", "error", err)
-		return err
+	switch msg["type"] {
+	case "query":
+		query := msg["location"].(string) + "?" + msg["params"].(string)
+		e.tracker.SubscribeToQuery(clientID, query)
+	case "mutation":
+		e.ExecuteMutation(msg["location"].(string), msg["params"].(map[string]interface{}))
 	}
-	e.tracker.SendMessage(clientID, message)
 	return nil
 }

example/client/index.ts

@@ -1,8 +1,21 @@
 import { TetherClient } from "tether-ts";
+import { createInterface } from "node:readline/promises";
 
 const client = new TetherClient();
 client.connect("ws://localhost:8080/tether");
 
-client.subscribe("messages", (message) => {
+client.subscribe("messages", { room: "1" }, (message) => {
 	console.log("Received message", message);
 });
+
+const rl = createInterface({
+  input: process.stdin,
+  output: process.stdout,
+});
+
+while (true) {
+  const message = await rl.question("Enter a message");
+  if (message) {
+    client.sendMutation("createMessage", { room: "1", message: message });
+  }
+}

example/client/package-lock.json

@@ -10,12 +10,47 @@
       "license": "ISC",
       "dependencies": {
         "tether-ts": "github:wisplite/tether-ts"
+      },
+      "devDependencies": {
+        "@types/node": "^22.0.0",
+        "typescript": "^5.0.0"
+      }
+    },
+    "node_modules/@types/node": {
+      "version": "22.19.17",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.19.17.tgz",
+      "integrity": "sha512-wGdMcf+vPYM6jikpS/qhg6WiqSV/OhG+jeeHT/KlVqxYfD40iYJf9/AE1uQxVWFvU7MipKRkRv8NSHiCGgPr8Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.21.0"
       }
     },
     "node_modules/tether-ts": {
       "version": "1.0.3",
-      "resolved": "git+ssh://git@github.com/wisplite/tether-ts.git#5202a7f844be4ad7f3a463352fe366c4718a2749",
+      "resolved": "git+ssh://git@github.com/wisplite/tether-ts.git#8945de00ece92ce1e939a3ff70c5312f80e56dda",
       "license": "ISC"
+    },
+    "node_modules/typescript": {
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "6.21.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
+      "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
+      "dev": true,
+      "license": "MIT"
     }
   }
 }

example/client/package.json

@@ -11,5 +11,9 @@
   },
   "dependencies": {
     "tether-ts": "github:wisplite/tether-ts"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "typescript": "^5.0.0"
   }
 }

example/client/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "strict": true,
+    "skipLibCheck": true,
+    "noEmit": true,
+    "types": ["node"]
+  },
+  "include": ["*.ts"]
+}

example/main.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 
 	"github.com/glebarez/sqlite"
+	"github.com/google/uuid"
 	"github.com/wisplite/tether"
 	"gorm.io/gorm"
 )
@@ -16,11 +17,11 @@ type User struct {
 }
 
 type Messages struct {
-	ID         string `gorm:"primaryKey"`
-	Message    string
-	SenderID   string
-	ReceiverID string
-	CreatedAt  time.Time
+	ID        string `gorm:"primaryKey"`
+	Message   string
+	SenderID  string
+	RoomID    string
+	CreatedAt time.Time
 }
 
 func main() {
@@ -42,6 +43,11 @@ func main() {
 		return nil
 	})
 
+	engine.RegisterMutation("createMessage", func(ctx *tether.MutationCtx) error {
+		ctx.DB.Create(&Messages{ID: uuid.NewString(), Message: ctx.Params["message"].(string), SenderID: ctx.AuthCtx.UserID, RoomID: ctx.Params["room"].(string)})
+		return nil
+	})
+
 	http.HandleFunc("/tether", engine.Handle)
 	http.ListenAndServe(":8080", nil)
 }

reactivity/tracker.go

@@ -32,25 +32,25 @@ func (t *Tracker) Untrack(c *Client) {
 	delete(t.clients, c.ID)
 }
 
-func (t *Tracker) SubscribeToQuery(clientID string, queryHash string) {
+func (t *Tracker) SubscribeToQuery(clientID string, query string) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
-	if t.subscriptions[queryHash] == nil {
-		t.subscriptions[queryHash] = make(map[string]bool)
+	if t.subscriptions[query] == nil {
+		t.subscriptions[query] = make(map[string]bool)
 	}
-	t.subscriptions[queryHash][clientID] = true
+	t.subscriptions[query][clientID] = true
 }
 
-func (t *Tracker) UnsubscribeFromQuery(clientID string, queryHash string) {
+func (t *Tracker) UnsubscribeFromQuery(clientID string, query string) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
-	delete(t.subscriptions[queryHash], clientID)
+	delete(t.subscriptions[query], clientID)
 }
 
-func (t *Tracker) GetQuerySubscriptions(queryHash string) []string {
+func (t *Tracker) GetQuerySubscriptions(query string) []string {
 	t.mu.RLock()
 	defer t.mu.RUnlock()
-	subscriptions := t.subscriptions[queryHash]
+	subscriptions := t.subscriptions[query]
 	subscriptionIDs := make([]string, 0, len(subscriptions))
 	for clientID := range subscriptions {
 		subscriptionIDs = append(subscriptionIDs, clientID)