From c22c033e730aecce2c00228a1e65df217156b414 Mon Sep 17 00:00:00 2001
From: Nik Afiq <nik.afiq98@ymail.com>
Date: Sat, 23 Aug 2025 13:46:23 +0900
Subject: [PATCH] Added spanner emulator as DB

---
 Makefile                | 19 +++++++++++++++++++
 ddl/schema.sql          |  7 +++++++
 docker-compose.yml      | 23 +++++++++++++++++++++++
 scripts/spanner-init.sh | 30 ++++++++++++++++++++++++++++++
 4 files changed, 79 insertions(+)
 mode change 100644 => 100755 scripts/spanner-init.sh

diff --git a/Makefile b/Makefile
index e69de29..43e3fdc 100644
--- a/Makefile
+++ b/Makefile
@@ -0,0 +1,19 @@
+.PHONY: up down down-volume logs ps
+
+up:
+	docker compose up -d spanner
+
+init:
+	docker compose up -d spanner-init
+
+down:
+	docker compose down
+
+down-volume:
+	docker compose down -v
+
+ps:
+	docker compose ps
+
+logs:
+	docker compose logs -f
\ No newline at end of file
diff --git a/ddl/schema.sql b/ddl/schema.sql
index e69de29..b88c43c 100644
--- a/ddl/schema.sql
+++ b/ddl/schema.sql
@@ -0,0 +1,7 @@
+CREATE TABLE item_stock (
+  id STRING(36) NOT NULL DEFAULT (GENERATE_UUID()),
+  name STRING(100),
+  amount INT64,
+  price NUMERIC,
+  sales_amount INT64
+) PRIMARY KEY (id);
\ No newline at end of file
diff --git a/docker-compose.yml b/docker-compose.yml
index e69de29..6d24dd1 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -0,0 +1,23 @@
+services:
+  spanner:
+    image: gcr.io/cloud-spanner-emulator/emulator:latest
+    container_name: spanner-emulator
+    ports:
+      - "9010:9010"   # gRPC
+      - "9020:9020"   # REST
+
+  spanner-init:
+    image: google/cloud-sdk:slim
+    container_name: spanner-init
+    depends_on:
+      - spanner
+    env_file:
+      - .env
+    environment:
+      # Tell gcloud/client libs to talk to the emulator inside the network
+      - SPANNER_EMULATOR_HOST=spanner:9010
+    volumes:
+      - ./scripts/spanner-init.sh:/work/spanner-init.sh:ro
+      - ./ddl:/work/ddl:ro
+    working_dir: /work
+    entrypoint: [ "bash", "/work/spanner-init.sh" ]
\ No newline at end of file
diff --git a/scripts/spanner-init.sh b/scripts/spanner-init.sh
old mode 100644
new mode 100755
index e69de29..8e73bb1
--- a/scripts/spanner-init.sh
+++ b/scripts/spanner-init.sh
@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+: "${SPANNER_PROJECT:?}"
+: "${SPANNER_INSTANCE:?}"
+: "${SPANNER_DATABASE:?}"
+
+# 1) Wait for emulator gRPC port (inside compose network it's "spanner:9010")
+for _ in $(seq 1 60); do
+  (echo >/dev/tcp/spanner/9010) >/dev/null 2>&1 && break
+  sleep 1
+done
+
+# 2) Point gcloud to the emulator (disable real IAM)
+export SPANNER_EMULATOR_HOST=spanner:9010
+gcloud config set auth/disable_credentials true >/dev/null
+gcloud config set core/project "${SPANNER_PROJECT}" >/dev/null
+gcloud config set api_endpoint_overrides/spanner http://spanner:9020/ >/dev/null
+
+# 3) Create instance & database (idempotent)
+gcloud spanner instances create "${SPANNER_INSTANCE}" \
+  --config=emulator-config --nodes=1 --description="Dev" >/dev/null 2>&1 || true
+
+gcloud spanner databases create "${SPANNER_DATABASE}" \
+  --instance="${SPANNER_INSTANCE}" >/dev/null 2>&1 || true
+
+# 4) Apply DDL
+gcloud spanner databases ddl update "${SPANNER_DATABASE}" \
+  --instance="${SPANNER_INSTANCE}" \
+  --ddl-file="/work/ddl/schema.sql" >/dev/null
\ No newline at end of file