| /* |
| * 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. |
| */ |
| |
| /* eslint-disable strict */ |
| |
| // agent that forwards invocations to the developer's computer by storing them in the |
| // activation db using simple "echo.js" actions (_wskdebug_invoked & _wskdebug_completed), |
| // and polling the activation db for those |
| |
| const openwhisk = require('openwhisk'); |
| |
| const activationListFilterOnlyBasename = false; |
| |
| function outOfTime(deadline) { |
| // stop 10 seconds before timeout, to have enough buffer |
| return (Date.now() >= ((deadline || process.env.__OW_DEADLINE) - 10*1000)); |
| } |
| |
| async function sleep(millis) { |
| return new Promise(resolve => setTimeout(resolve, millis)); |
| } |
| |
| function removePrefix(str, prefix) { |
| if (str.startsWith(prefix)) { |
| return str.substring(prefix.length); |
| } |
| return str; |
| } |
| |
| function actionName() { |
| return removePrefix(process.env.__OW_ACTION_NAME, `/${process.env.__OW_NAMESPACE}/`); |
| } |
| |
| async function newActivation(args) { |
| args.$activationId = process.env.__OW_ACTIVATION_ID; |
| await openwhisk().actions.invoke({ |
| name: `${actionName()}_wskdebug_invoked`, |
| params: args |
| }); |
| return args.$activationId; |
| } |
| |
| async function pollActivations(actionName, onActivation, onLoop) { |
| const wsk = openwhisk(); |
| |
| const since = Date.now(); |
| |
| while (true) { |
| |
| let name = actionName; |
| if (activationListFilterOnlyBasename) { |
| if (actionName.includes("/")) { |
| name = actionName.substring(actionName.lastIndexOf("/") + 1); |
| } |
| } |
| |
| const activations = await wsk.activations.list({ |
| name: name, |
| since: since, |
| docs: true // include results |
| }); |
| |
| for (const a of activations) { |
| const result = onActivation(a); |
| if (result) { |
| return result; |
| } |
| } |
| |
| await sleep(1000); |
| |
| onLoop(); |
| } |
| } |
| |
| async function waitForCompletion(activationId) { |
| return pollActivations( |
| `${actionName()}_wskdebug_completed`, |
| a => { |
| // find the one with the $activationId we are waiting on |
| if (a.response && a.response.result && |
| a.response.result.$activationId === activationId) { |
| const result = a.response.result; |
| delete result.$activationId; |
| return result; |
| } |
| }, |
| () => { |
| if (outOfTime()) { |
| throw new Error(`Debugger did not complete activation within timeout.`); |
| } |
| } |
| ); |
| } |
| |
| // Note: this function is duplicated by all agents |
| function hit(args, condition) { |
| if (condition) { |
| console.log("arguments:", args); |
| console.log("evaluating hit condition: ", condition); |
| // eslint-disable-next-line no-with |
| with (args) { // lgtm [js/with-statement] |
| try { |
| // eslint-disable-next-line no-eval |
| return eval(condition); |
| } catch (e) { |
| console.log("failed to eval condition:", e); |
| // be safe: do not hit if error in condition |
| return false; |
| } |
| } |
| } else { |
| // no condition => always hit |
| return true; |
| } |
| } |
| |
| async function doMain(args) { |
| // normal activation: make activation available to debugger |
| console.log("activation"); |
| |
| if (hit(args, args.$condition)) { |
| console.log("passing on to debugger"); |
| const id = await newActivation(args); |
| return waitForCompletion( id ); |
| |
| } else { |
| console.log("condition evaluated to false, executing original action"); |
| return openwhisk().actions.invoke({ |
| name: `${process.env.__OW_ACTION_NAME}_wskdebug_original`, |
| params: args, |
| blocking: true, |
| result: true |
| }); |
| } |
| } |
| |
| // OpenWhisk does not like raw exceptions, the error object should be the string message only |
| // eslint-disable-next-line no-unused-vars |
| async function main(args) { |
| try { |
| return await doMain(args); |
| } catch (e) { |
| console.log("Exception:", e); |
| return Promise.reject({ error: e.message, code: e.code}); |
| } |
| } |