mpmunasinghe commented on a change in pull request #1: Adding initial sources for Ballerina runtime URL: https://github.com/apache/incubator-openwhisk-runtime-ballerina/pull/1#discussion_r204620060
########## File path: ballerina/proxy/src/main/java/org/ballerinalang/openwhisk/runtime/BallerinaProxy.java ########## @@ -0,0 +1,243 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.ballerinalang.openwhisk.runtime; + +import com.google.gson.JsonObject; +import org.ballerinalang.BLangProgramLoader; +import org.ballerinalang.logging.BLogManager; +import org.ballerinalang.model.values.BJSON; +import org.ballerinalang.model.values.BValue; +import org.ballerinalang.util.codegen.ProgramFile; +import org.ballerinalang.util.exceptions.BLangRuntimeException; +import org.ballerinalang.util.exceptions.ProgramFileFormatException; +import org.ballerinalang.util.program.BLangFunctions; +import org.wso2.msf4j.Request; + +import java.io.ByteArrayInputStream; +import java.io.IOException; +import java.io.InputStream; +import java.lang.reflect.Field; +import java.nio.charset.StandardCharsets; +import java.util.Collections; +import java.util.HashMap; +import java.util.Map; +import java.util.Optional; +import java.util.logging.LogManager; +import javax.ws.rs.POST; +import javax.ws.rs.Path; +import javax.ws.rs.core.Context; +import javax.ws.rs.core.HttpHeaders; +import javax.ws.rs.core.Response; + +/** + * OpenWhisk Ballerina Runtime Proxy Service + * Exposes /init and /run resources + */ +@Path("/") public class BallerinaProxy { + private ProgramFile programFile; + private String mainFunction = Constants.FUNCTION_CALLABLE_NAME; + + @POST + @Path("init") + public Response init(@Context Request request) throws IOException { + Optional<ProgramFile> optionalValue = Optional.ofNullable(programFile); + + // Check whether init being called before + if (optionalValue.isPresent()) { + System.err.println(Constants.INIT_ONCE_ERROR); + return buildResponse(Response.Status.BAD_GATEWAY, Constants.RESPONSE_ERROR, Constants.INIT_ONCE_ERROR); + } + + InputStream balxIs = null; + try { + ((BLogManager) LogManager.getLogManager()).loadUserProvidedLogConfiguration(); + JsonObject payload = BalxLoader.requestToJson(request); + + if (payload.size() == 0) { + return buildResponse(Response.Status.INTERNAL_SERVER_ERROR, Constants.RESPONSE_ERROR, + Constants.FAILED_TO_LOCATE_BINARY); + + } + + JsonObject requestElements = payload.getAsJsonObject(Constants.JSON_VALUE); + Boolean isBinary = requestElements.get(Constants.BINARY).getAsBoolean(); + String main = requestElements.get(Constants.FUNCTION_MAIN).getAsString(); + + if (!Constants.FUNCTION_MAIN.equals(main)) { + mainFunction = main; + } + + // Check for binary value. .balx should be received with the binary parameter + if (isBinary) { + String base64Balx = requestElements.get(Constants.CODE).getAsString(); + + balxIs = new ByteArrayInputStream(base64Balx.getBytes(StandardCharsets.UTF_8)); + + java.nio.file.Path destinationPath = BalxLoader.saveBase64EncodedFile(balxIs); + + programFile = BLangProgramLoader.read(destinationPath); + + return buildResponse(Response.Status.OK, Constants.RESPONSE_SUCCESS, Constants.INIT_SUCCESS); + } else { + return buildResponse(Response.Status.INTERNAL_SERVER_ERROR, Constants.RESPONSE_ERROR, + Constants.FAILED_TO_LOCATE_BINARY); + } + } catch (ProgramFileFormatException | BLangRuntimeException e) { + return buildResponse(Response.Status.INTERNAL_SERVER_ERROR, Constants.RESPONSE_ERROR, + Constants.FAILED_TO_LOCATE_BINARY); + } catch (IOException e) { + return buildResponse(Response.Status.INTERNAL_SERVER_ERROR, Constants.RESPONSE_ERROR, + Constants.MISSING_MAIN_ERROR); + } finally { + if (balxIs != null) { + balxIs.close(); + } + } + } + + @POST + @Path("run") + public Response run(@Context Request request) { + Optional<ProgramFile> optionalValue = Optional.ofNullable(programFile); + JsonObject requestElements; + BValue[] result; + + // Check whether init function has success and the program file is set + if (!optionalValue.isPresent()) { + return buildRunResponse(Response.Status.BAD_REQUEST, Constants.RESPONSE_ERROR, + Constants.FUNCTION_NOT_INITIALIZED); + } + + requestElements = BalxLoader.requestToJson(request); + + if (requestElements.size() == 0 || requestElements.getAsJsonObject(Constants.JSON_VALUE) == null) { + return buildRunResponse(Response.Status.BAD_REQUEST, Constants.RESPONSE_ERROR, + Constants.INVALID_INPUT_PARAMS); + } + + //Preparing input parameters + BValue bJson = new BJSON(requestElements.getAsJsonObject(Constants.JSON_VALUE).toString()); + BValue[] parameters = new BValue[1]; + parameters[0] = bJson; + + //Setting up runtime environment variables + augmentEnv(requestElements); + + //Invoking the program file + try { + programFile = BalxLoader.initProgramFile(programFile); + result = BLangFunctions + .invokeEntrypointCallable(programFile, programFile.getEntryPkgName(), mainFunction, parameters); + } catch (Exception e) { + return buildRunResponse(Response.Status.BAD_REQUEST, Constants.RESPONSE_ERROR, + Constants.FUNCTION_RUN_FAILURE); + } + + //Preparing function response + StringBuilder response = new StringBuilder(); + for (BValue bValue : result) { + if ("json".equals(bValue.getType().toString())) { Review comment: bValue is defined as json hence it is expected to Return the type String as json. 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