@uoa/lambda-tracing/dist/logging.js

Library for logging & distributed tracing in UoA Lambda projects

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const UoaB3Propagator_1 = require("./UoaB3Propagator");
const tracing_1 = require("./tracing");
const UoaLogger_1 = require("./UoaLogger");
const winston = require('winston');
const moment = require('moment');
const path = require('path');
const { trace, context } = require('@opentelemetry/api');
const defaultLogPattern = '%date [%thread] %level %class - [[[%traceId,%spanId,%info]]] %message';
const uoaLogLevels = {
    error: 0,
    warn: 1,
    audit: 2,
    info: 3,
    debug: 4
};
const uoaLoggingFormat = function (callingModule) {
    return winston.format.printf((logInfo) => {
        let logPattern = process.env.loggingPattern ? process.env.loggingPattern : defaultLogPattern;
        const logReplacements = getLogReplacementValues(callingModule, logInfo);
        logReplacements.forEach((value, key) => {
            logPattern = logPattern.replace(key, value);
        });
        return logPattern;
    });
};
function getLogReplacementValues(callingModule, logInfo) {
    const parts = callingModule.filename.substring(0, callingModule.filename.lastIndexOf('.js')).split(path.sep);
    const moduleParts = parts.slice(parts.indexOf('src'));
    let traceId = '-';
    let spanId = '-';
    const currentContext = trace.getSpanContext(context.active());
    if (currentContext) {
        traceId = currentContext.traceId;
        spanId = currentContext.spanId;
    }
    let info = '-';
    const infoHeader = context.active().getValue(UoaB3Propagator_1.B3_INFO_KEY);
    if ((0, tracing_1.getTraceInfoHeader)()) {
        info = (0, tracing_1.getTraceInfoHeader)();
    }
    else if (infoHeader) {
        info = infoHeader.toString();
    }
    let message = '-';
    if (logInfo.message != null) {
        message = logInfo.message;
    }
    const traceIdLength = context.active().getValue(UoaB3Propagator_1.B3_TRACE_ID_LENGTH_KEY);
    let logReplacements = new Map();
    logReplacements.set('%date', moment().toISOString());
    logReplacements.set('%thread', '-');
    logReplacements.set('%level', logInfo.level.toUpperCase());
    logReplacements.set('%class', moduleParts.join('.'));
    logReplacements.set('%traceId', traceId.slice(traceId.length - traceIdLength));
    logReplacements.set('%spanId', spanId);
    logReplacements.set('%info', info);
    logReplacements.set('%message', message.replace(/\n/g, ''));
    return logReplacements;
}
module.exports = function (callingModule) {
    return new UoaLogger_1.UoaLogger({
        levels: uoaLogLevels,
        transports: [
            new winston.transports.Console({
                level: process.env.loggingLevel ? process.env.loggingLevel.toLowerCase() : 'info'
            })
        ],
        format: uoaLoggingFormat(callingModule)
    });
};