add example

examples/connection-per-vu.js

@@ -0,0 +1,34 @@
+import Amqp from 'k6/x/amqp'
+import exec from 'k6/execution'
+
+export const options = {
+  vus: 10,
+  duration: '30s',
+}
+
+const url = "amqp://guest:guest@localhost:5672/"
+const connIds = new Map()
+
+function getConnectionId (vuId) {
+  if (!connIds.has(vuId)) {
+    const connectionId = Amqp.start({ connection_url: url })
+    connIds.set(vuId, connectionId)
+    return connectionId
+  }
+  return connIds.get(vuId)
+}
+
+export default function () {
+  console.log("K6 amqp extension enabled, version: " + Amqp.version)
+
+  const connectionId = getConnectionId(exec.vu.idInInstance)
+  const queueName = 'K6 queue'
+
+  Amqp.publish({
+    connection_id: connectionId,
+    queue_name: queueName,
+    exchange: '',
+    content_type: 'text/plain',
+    body: 'Ping from k6'
+  })
+}