118 lines
3 KiB
JavaScript
118 lines
3 KiB
JavaScript
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'use strict';
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const _ = require('lodash');
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const assert = require('assert');
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const Env = require('../Env');
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const IdGenerator = require('../IdGenerator');
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const LevelsContainer = require('../levels-container');
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const LogContext = require('./LogContext');
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const normalizeComponent = require('../common').normalizeComponent;
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const consts = require('../constants');
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const ListLog = require('../formats/ListLog');
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const Trace = require('../formats/Trace');
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const CFLog = require('../formats/CFLog');
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class AppContext {
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constructor(options) {
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this._options = processOptions(options);
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this._env = new Env();
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this._idGen = new IdGenerator();
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this._levels = new LevelsContainer();
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this._formatters = initFormatters(this);
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this._customFieldNames = [];
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enableRuntimeLevelChanging(this);
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}
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setCustomFields(fields) {
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assert(_.isArray(fields), 'Fields argument should be an array');
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this._customFieldNames = fields || [];
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}
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_containsCustomField(obj) {
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if (!obj) {
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return null;
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}
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return this._customFieldNames.some((prop) => {
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return obj.hasOwnProperty(prop);
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});
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}
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_filterCustomFields(obj) {
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if (!obj) {
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return null;
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}
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return this._customFieldNames.reduce((p, c) => {
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if (obj.hasOwnProperty(c)) {
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p[c] = typeof obj[c] === 'string' ? obj[c] : JSON.stringify(obj[c]);
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}
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return p;
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}, {});
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}
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createLogContext(options) {
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return new LogContext(this, options);
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}
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setLevel(component, level) {
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this._levels.set(normalizeComponent(component), level);
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}
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unsetLevel(component) {
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this._levels.unset(normalizeComponent(component));
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}
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}
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function processOptions(options) {
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assert(options === undefined || _.isObject(options), 'Expected an object for application-wide options (if provided)');
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options = options || {};
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assert(options.csnComponent === undefined || _.isString(options.csnComponent), '"csnComponent" (if provided) should be a string');
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return options;
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}
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function initFormatters(ctx) {
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const env = ctx._env;
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if (env.runsOnCF) {
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var log = new CFLog(env);
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var trace = new CFLog(env);
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} else {
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log = new ListLog(env);
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trace = new Trace(env);
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}
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return { log, trace };
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}
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function enableRuntimeLevelChanging(ctx) {
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const runtimeMessaging = loadXSRuntimeMessaging(ctx);
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if (!runtimeMessaging) {
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return;
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}
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const rtConn = runtimeMessaging.getRuntimeConnection();
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rtConn.on('ready', () => {
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const consumer = rtConn.consumer('SetLoggingLevel');
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consumer.on('handleDelivery', (component, level) => {
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if (level) {
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ctx.setLevel(component, level);
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} else {
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ctx.unsetLevel(component);
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}
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});
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ctx._consumer = consumer;
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});
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rtConn.unref();
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ctx._rtConn = rtConn;
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}
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function loadXSRuntimeMessaging(ctx) {
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try {
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return require('sap_xsrt_messaging');
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} catch (exc) {
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ctx.createLogContext({ id: '' }).getLogger(consts.LIB_CATEGORY).warning('Dynamic log level switching not available');
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}
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}
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module.exports = AppContext;
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