From a6ff67a4da25d1b850b1d09df9f389b2a12229c9 Mon Sep 17 00:00:00 2001
From: GoJang <lf2.net0919@gmail.com>
Date: Fri, 8 Aug 2025 15:45:01 +0800
Subject: [PATCH] feat: enhance multi-container deployment support
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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This commit adds support for running multiple MicroOCPPSimulator instances
on the same host with runtime configuration capabilities:

## Key Features

### Runtime API Configuration
- Added entrypoint script for dynamic API_ROOT configuration at container startup
- Frontend now supports window.API_ROOT for runtime API endpoint configuration
- Maintains backward compatibility with existing environment variable approach

### Environment-based Charger Configuration
- Added CHARGER_ID and CHARGER_KEY environment variable support
- Allows different charging station identities for multi-container scenarios
- Falls back to default values for single-instance compatibility
- Added runtime logging for configuration debugging

### Container Enhancements
- Modified Dockerfile to support runtime configuration through entrypoint script
- Improved container structure for multi-instance deployment
- Enhanced deployment flexibility while preserving existing functionality

## Benefits
- Enables easy testing of multiple charging station simulators
- Supports scalability testing with multiple concurrent instances
- Maintains full backward compatibility with existing deployments
- Facilitates complex OCPP network simulation scenarios

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 Dockerfile    | 12 +++++++++---
 entrypoint.sh | 21 +++++++++++++++++++++
 src/main.cpp  | 14 ++++++++++++--
 webapp-src    |  2 +-
 4 files changed, 43 insertions(+), 6 deletions(-)
 create mode 100644 entrypoint.sh

diff --git a/Dockerfile b/Dockerfile
index d90093e..58d3e9c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,8 +22,14 @@ RUN cmake --build ./build -j 16 --target mo_simulator -j 16
 # Grant execute permissions to the shell script
 RUN chmod +x /MicroOcppSimulator/build/mo_simulator
 
-# Expose port 8000
-EXPOSE 8000
+# Copy pre-built frontend public folder for runtime API configuration
+COPY public /public
+
+# Copy entrypoint script for runtime environment setup
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
 
-# Run the shell script inside the container
+ENTRYPOINT ["/entrypoint.sh"]
 CMD ["./build/mo_simulator"]
+
+EXPOSE 8000
diff --git a/entrypoint.sh b/entrypoint.sh
new file mode 100644
index 0000000..0b71a34
--- /dev/null
+++ b/entrypoint.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+set -e
+
+# Runtime API endpoint configuration
+TARGET_FILE="./public/bundle.html.gz"
+TEMP_HTML="/tmp/bundle.html"
+
+if [ -z "$API_ROOT" ]; then
+  echo "[warn] API_ROOT environment variable not detected, frontend will use {{API_ROOT}} placeholder"
+else
+  echo "[info] Runtime replacement: {{API_ROOT}} → $API_ROOT"
+  # Decompress to temporary file
+  gzip -d -c "$TARGET_FILE" > "$TEMP_HTML"
+  # Replace all placeholders
+  sed -i "s|{{API_ROOT}}|$API_ROOT|g" "$TEMP_HTML"
+  # Recompress back to original path
+  gzip -9 -c "$TEMP_HTML" > "$TARGET_FILE"
+fi
+
+# Start the C++ simulator
+exec "./build/mo_simulator"
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 0e945fd..56f2aec 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -101,10 +101,20 @@ void load_ocpp_version(std::shared_ptr<MicroOcpp::FilesystemAdapter> filesystem)
 }
 
 void app_setup(MicroOcpp::Connection& connection, std::shared_ptr<MicroOcpp::FilesystemAdapter> filesystem) {
+    // Configure charger credentials from environment variables or use defaults
+    const char *envId = std::getenv("CHARGER_ID");
+    const char *envKey = std::getenv("CHARGER_KEY");
+    std::string chargerId = envId ? envId : "MicroOcpp Simulator";
+    std::string chargerKey = envKey ? envKey : "MicroOcpp";
+    
+    // Log runtime configuration values for debugging
+    std::cout << "[INFO] Charger ID: " << chargerId << std::endl;
+    std::cout << "[INFO] Charger Key: " << chargerKey << std::endl;
+
     mocpp_initialize(connection,
             g_isOcpp201 ?
-                ChargerCredentials::v201("MicroOcpp Simulator", "MicroOcpp") :
-                ChargerCredentials("MicroOcpp Simulator", "MicroOcpp"),
+                ChargerCredentials::v201(chargerId.c_str(), chargerKey.c_str()) :
+                ChargerCredentials(chargerId.c_str(), chargerKey.c_str()),
             filesystem,
             false,
             g_isOcpp201 ?
diff --git a/webapp-src b/webapp-src
index 015a0e8..0775451 160000
--- a/webapp-src
+++ b/webapp-src
@@ -1 +1 @@
-Subproject commit 015a0e816ca4fc617e67acdbe7d067688d6b3939
+Subproject commit 07754510f369e2a71d76b86ad8ee4525458db687