feat: add capnp

Signed-off-by: kjuulh <contact@kjuulh.io>

scripts/grpc.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+# Helper script for testing SQ gRPC endpoints with grpcurl.
+# Usage: ./scripts/grpc.sh <command> [args...]
+#
+# Commands:
+#   status [addr]         - Get node status
+#   publish <topic> <msg> - Publish a message
+#   subscribe <topic>     - Subscribe to a topic
+#   topics                - List topics
+
+set -euo pipefail
+
+ADDR="${SQ_ADDR:-127.0.0.1:6060}"
+
+case "${1:-help}" in
+  status)
+    addr="${2:-$ADDR}"
+    grpcurl -plaintext "$addr" sq.v1.StatusService/Status
+    ;;
+  publish)
+    topic="${2:?topic required}"
+    msg="${3:?message required}"
+    grpcurl -plaintext -d "{\"topic\": \"$topic\", \"messages\": [{\"value\": \"$(echo -n "$msg" | base64)\"}]}" \
+      "$ADDR" sq.v1.DataPlaneService/Publish
+    ;;
+  subscribe)
+    topic="${2:?topic required}"
+    grpcurl -plaintext -d "{\"topic\": \"$topic\", \"partition\": 0}" \
+      "$ADDR" sq.v1.DataPlaneService/Subscribe
+    ;;
+  topics)
+    grpcurl -plaintext "$ADDR" sq.v1.ControlPlaneService/ListTopics
+    ;;
+  help|*)
+    echo "Usage: $0 <command> [args...]"
+    echo ""
+    echo "Commands:"
+    echo "  status [addr]         - Get node status"
+    echo "  publish <topic> <msg> - Publish a message"
+    echo "  subscribe <topic>     - Subscribe to a topic"
+    echo "  topics                - List topics"
+    echo ""
+    echo "Environment: SQ_ADDR (default: 127.0.0.1:6060)"
+    ;;
+esac