feat(enclave): add ping function for echoing input messages

example/index.html

@@ -40,6 +40,12 @@
       <button onclick="runAllTests()" style="margin-left: 1rem;">Run All Tests</button>
     </div>
 
+    <div class="card">
+      <h2>ping(message)</h2>
+      <input type="text" id="ping-msg" value="hello from browser" placeholder="Message to echo">
+      <button onclick="testPing()">Run</button>
+    </div>
+
     <div class="card">
       <h2>generate(credential)</h2>
       <input type="text" id="credential" value="dGVzdC1jcmVkZW50aWFs" placeholder="Base64 credential">

example/main.js

@@ -40,6 +40,26 @@ async function init() {
   }
 }
 
+window.testPing = async function() {
+  if (!enclave) return log(LogLevel.ERR, 'ping', 'Plugin not loaded');
+  
+  const message = document.getElementById('ping-msg').value || 'hello';
+  log(LogLevel.INFO, 'ping', `message="${message}"`);
+  
+  try {
+    const result = await enclave.ping(message);
+    if (result.success) {
+      log(LogLevel.OK, 'ping', `echo="${result.echo}"`, result);
+    } else {
+      log(LogLevel.ERR, 'ping', result.message, result);
+    }
+    return result;
+  } catch (err) {
+    log(LogLevel.ERR, 'ping', err?.message || String(err));
+    throw err;
+  }
+};
+
 window.testGenerate = async function() {
   if (!enclave) return log(LogLevel.ERR, 'generate', 'Plugin not loaded');
   
@@ -137,6 +157,7 @@ window.runAllTests = async function() {
   log(LogLevel.INFO, null, '=== Running all tests ===');
   
   try {
+    await testPing();
     await testGenerate();
     await testLoad();
     await testExec();

go.mod

@@ -2,4 +2,11 @@ module enclave
 
 go 1.25.5
 
-require github.com/extism/go-pdk v1.1.3 // indirect
+require github.com/extism/go-pdk v1.1.3
+
+require (
+	github.com/ncruces/go-sqlite3 v0.30.4 // indirect
+	github.com/ncruces/julianday v1.0.0 // indirect
+	github.com/tetratelabs/wazero v1.11.0 // indirect
+	golang.org/x/sys v0.39.0 // indirect
+)

go.sum

@@ -1,2 +1,10 @@
 github.com/extism/go-pdk v1.1.3 h1:hfViMPWrqjN6u67cIYRALZTZLk/enSPpNKa+rZ9X2SQ=
 github.com/extism/go-pdk v1.1.3/go.mod h1:Gz+LIU/YCKnKXhgge8yo5Yu1F/lbv7KtKFkiCSzW/P4=
+github.com/ncruces/go-sqlite3 v0.30.4 h1:j9hEoOL7f9ZoXl8uqXVniaq1VNwlWAXihZbTvhqPPjA=
+github.com/ncruces/go-sqlite3 v0.30.4/go.mod h1:7WR20VSC5IZusKhUdiR9y1NsUqnZgqIYCmKKoMEYg68=
+github.com/ncruces/julianday v1.0.0 h1:fH0OKwa7NWvniGQtxdJRxAgkBMolni2BjDHaWTxqt7M=
+github.com/ncruces/julianday v1.0.0/go.mod h1:Dusn2KvZrrovOMJuOt0TNXL6tB7U2E8kvza5fFc9G7g=
+github.com/tetratelabs/wazero v1.11.0 h1:+gKemEuKCTevU4d7ZTzlsvgd1uaToIDtlQlmNbwqYhA=
+github.com/tetratelabs/wazero v1.11.0/go.mod h1:eV28rsN8Q+xwjogd7f4/Pp4xFxO7uOGbLcD/LzB1wiU=
+golang.org/x/sys v0.39.0 h1:CvCKL8MeisomCi6qNZ+wbb0DN9E5AATixKsvNtMoMFk=
+golang.org/x/sys v0.39.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=

main.go

@@ -108,6 +108,47 @@ var enclave = &Enclave{}
 
 func main() {}
 
+// PingInput represents the input for the ping function
+type PingInput struct {
+	Message string `json:"message"`
+}
+
+// PingOutput represents the output of the ping function
+type PingOutput struct {
+	Success bool   `json:"success"`
+	Message string `json:"message"`
+	Echo    string `json:"echo"`
+}
+
+//go:wasmexport ping
+func ping() int32 {
+	pdk.Log(pdk.LogInfo, "ping: received request")
+
+	var input PingInput
+	if err := pdk.InputJSON(&input); err != nil {
+		output := PingOutput{
+			Success: false,
+			Message: fmt.Sprintf("failed to parse input: %s", err),
+		}
+		pdk.OutputJSON(output)
+		return 0
+	}
+
+	output := PingOutput{
+		Success: true,
+		Message: "pong",
+		Echo:    input.Message,
+	}
+
+	if err := pdk.OutputJSON(output); err != nil {
+		pdk.Log(pdk.LogError, fmt.Sprintf("ping: failed to output: %s", err))
+		return 1
+	}
+
+	pdk.Log(pdk.LogInfo, fmt.Sprintf("ping: responded with echo=%s", input.Message))
+	return 0
+}
+
 //go:wasmexport generate
 func generate() int32 {
 	pdk.Log(pdk.LogInfo, "generate: starting database initialization")

src/enclave.ts

@@ -157,6 +157,18 @@ export class Enclave {
     return output;
   }
 
+  async ping(message: string = 'hello'): Promise<{ success: boolean; message: string; echo: string }> {
+    this.log(`ping: sending "${message}"`);
+
+    const input = JSON.stringify({ message });
+    const result = await this.plugin.call('ping', input);
+    if (!result) throw new Error('ping: plugin returned no output');
+    const output = result.json() as { success: boolean; message: string; echo: string };
+
+    this.log(`ping: received ${output.success ? 'pong' : 'error'}`);
+    return output;
+  }
+
   /**
    * Reset plugin state
    */