chore: Add postgres dependency for server to startup

deploy/docker/fs/opt/appsmith/run-java.sh

@@ -16,6 +16,93 @@ cd "/opt/appsmith/server/$mode"
 declare -a extra_args
 proxy_configured=0
 
+waitForPostgresAvailability() {
+  if [ -z "$DB_HOST" ]; then
+    tlog "PostgreSQL host name is empty. Check env variables. Error. Exiting java setup"
+    exit 2
+  else
+
+    MAX_RETRIES=50
+    RETRYSECONDS=10
+    retry_count=0
+    while true; do
+      pg_isready -h "${DB_HOST}" -p "${DB_PORT}"
+      status=$?
+
+      case $status in
+      0)
+        echo "PostgreSQL host '${DB_HOST}' is ready."
+        break
+        ;;
+      1)
+        echo "PostgreSQL host '${DB_HOST}' is rejecting connections (e.g., due to being in recovery mode or not accepting connections eg. connections maxed out)."
+        ;;
+      2)
+        echo "PostgreSQL host '${DB_HOST}' is not responding or running."
+        ;;
+      3)
+        echo "The connection check failed (e.g., due to network issues or incorrect parameters)."
+        ;;
+      *)
+        echo "pg_isready exited with unexpected status code: $status"
+        break
+        ;;
+      esac
+
+      retry_count=$((retry_count + 1))
+      if [ $retry_count -le $MAX_RETRIES ]; then
+        tlog "PostgreSQL connection failed. Retrying attempt $retry_count/$MAX_RETRIES in $RETRYSECONDS seconds..."
+        sleep $RETRYSECONDS
+      else
+        tlog "Exceeded maximum retry attempts ($MAX_RETRIES). Exiting."
+        # use exit code 2 to indicate that the script failed to connect to postgres and supervisor conf is set not to restart the program for 2.
+        exit 2
+      fi
+
+    done
+  fi
+}
+
+# for PostgreSQL, we use APPSMITH_DB_URL=postgresql://username:password@postgresserver:5432/dbname
+# Args:
+#     conn_string (string): PostgreSQL connection string
+# Returns:
+#     None
+# Example:
+#     postgres syntax
+#       "postgresql://user:password@localhost:5432/appsmith"
+#       "postgresql://user:password@localhost/appsmith"
+#       "postgresql://user@localhost:5432/appsmith"
+#       "postgresql://user@localhost/appsmith"
+extract_postgres_db_params() {
+  local conn_string=$1
+
+  # Use node to parse the URI and extract components
+  IFS=' ' read -r USER PASSWORD HOST PORT DB <<<$(node -e "
+    const connectionString = process.argv[1];
+    const pgUri = connectionString.startsWith(\"postgresql://\")
+      ? connectionString
+      : 'http://' + connectionString; //Prepend a fake scheme for URL parsing
+    const url = require('url');
+    const parsedUrl = new url.URL(pgUri);
+
+    // Extract the pathname and remove the leading '/'
+    const db = parsedUrl.pathname.substring(1);
+
+    // Default the port to 5432 if it's empty
+    const port = parsedUrl.port || '5432';
+
+    console.log(\`\${parsedUrl.username || '-'} \${parsedUrl.password || '-'} \${parsedUrl.hostname} \${port} \${db}\`);
+  " "$conn_string")
+
+  # Now, set the environment variables
+  export DB_USER="$USER"
+  export DB_PASSWORD="$PASSWORD"
+  export DB_HOST="$HOST"
+  export DB_PORT="$PORT"
+  export DB_NAME="$DB"
+}
+
 match-proxy-url() {
   # Examples:
   #   http://proxy.example.com:8080/
@@ -29,6 +116,12 @@ match-proxy-url() {
   [[ -n $proxy_host ]]
 }
 
+# Extract the database parameters from the APPSMITH_DB_URL and wait for the database to be available
+if [[ "$mode" == "pg" ]]; then
+  extract_postgres_db_params "$APPSMITH_DB_URL"
+  waitForPostgresAvailability
+fi
+
 if match-proxy-url "${HTTP_PROXY-}"; then
   extra_args+=(-Dhttp.proxyHost="$proxy_host" -Dhttp.proxyPort="$proxy_port")
   if [[ -n $proxy_user ]]; then