com.genexus.cloud.serverless.aws.handler.LambdaFunctionConfigurationHelper Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of gxawsserverless Show documentation

Core classes for the runtime used by Java and Android apps generated with GeneXus

There is a newer version: 4.6.8

package com.genexus.cloud.serverless.aws.handler;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.genexus.cloud.serverless.exception.FunctionConfigurationException;
import com.genexus.diagnostics.core.ILogger;
import com.genexus.specific.java.LogManager;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;

public class LambdaFunctionConfigurationHelper {
	private static ILogger logger = LogManager.initialize(".", LambdaFunctionConfiguration.class);
	private static String ENTRY_POINT_CLASS_NAME_VAR = "GX_MAIN_CLASS_NAME";
	private static String FUNCTION_CONFIG_PATH = "gx-awslambda-function.json";

	public static LambdaFunctionConfiguration getFunctionConfiguration() throws FunctionConfigurationException {
		File configFile = new File(FUNCTION_CONFIG_PATH);
		LambdaFunctionConfiguration config = null;

		if (configFile.exists()) {
			try {
				String jsonConfig = new String(Files.readAllBytes(Paths.get(FUNCTION_CONFIG_PATH)));
				config = new ObjectMapper().readValue(jsonConfig, LambdaFunctionConfiguration.class);
			} catch (IOException e) {
				logger.error(String.format("Invalid lambda function configuration file: %s. Please check json content.", FUNCTION_CONFIG_PATH), e);
			}
		}
		if (config == null) {
			config = new LambdaFunctionConfiguration();
		}

		if (System.getenv(ENTRY_POINT_CLASS_NAME_VAR) != null) {
			config.setEntryPointClassName(System.getenv(ENTRY_POINT_CLASS_NAME_VAR));
		}

		if (!config.isValidConfiguration()) {
			throw new FunctionConfigurationException(String.format("Please check function configuration. Either file '%s' should be present, or '%s' Environment Variable must be defined", FUNCTION_CONFIG_PATH, ENTRY_POINT_CLASS_NAME_VAR));
		}
		return config;
	}

}