107 lines
3.0 KiB
Plaintext
107 lines
3.0 KiB
Plaintext
"use strict";
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const format = require("date-manip/dist/format");
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const isWhatType = require("is-what-type");
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const compilePattern = require("./compilePattern.js");
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const formatMessage = require("./formatMessage.js");
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const pad = require("./pad.js");
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function literalConverter(text) {
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return () => text;
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}
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function dateConverter(dateFormat = "ISO") {
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return (event) => {
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return format(event.timestamp, dateFormat);
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};
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}
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function levelConverter(minWidth = 0, alignLeft = true) {
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return (event) => {
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return pad(event.levelName, minWidth, alignLeft);
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};
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}
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function loggerConverter(minWidth = 0, alignLeft = true) {
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return (event) => {
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const { loggerName } = event;
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return pad(loggerName, minWidth, alignLeft);
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};
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}
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function messageConverter(minWidth = 0, maxLength = 0, alignLeft = true) {
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return (event) => {
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return formatMessage(event.message, (msg) => {
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if (maxLength > 0 && msg.length > maxLength) {
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msg = `${msg.substring(0, maxLength)}...`;
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}
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return pad(msg, minWidth, alignLeft);
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});
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};
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}
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function threadConverter() {
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return () => {
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return `PID:${process.pid}`;
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};
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}
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function mdcConverter(key, minWidth = 0, alignLeft = true) {
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return (event) => {
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const value = event.context[key] || "";
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return pad(String(value), minWidth, alignLeft);
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};
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}
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class PatternLayout {
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/**
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* Constructor (构造函数)
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* @param pattern Pattern string (模版字符串)
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*/
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constructor(pattern = "[%d{YYYY-MM-DD HH:mm:ss.SSSZ}] %p %c - %m", createConverter) {
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this.converters = compilePattern(
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pattern,
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(specifier, alignLeft, minWidth, maxLength, format2) => {
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if (isWhatType.isFunction(createConverter)) {
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const converter = createConverter(
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specifier,
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alignLeft,
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minWidth,
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maxLength,
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format2
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);
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if (isWhatType.isFunction(converter)) {
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return converter;
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}
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}
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switch (specifier.toLowerCase()) {
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case "%":
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return literalConverter("%");
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case "d":
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return dateConverter(format2);
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case "p":
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return levelConverter(minWidth, alignLeft);
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case "c":
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return loggerConverter(minWidth, alignLeft);
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case "m":
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return messageConverter(minWidth, maxLength, alignLeft);
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case "t":
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return threadConverter();
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case "x":
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return mdcConverter(format2 || "", minWidth, alignLeft);
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default:
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return literalConverter(`%${specifier}`);
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}
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},
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literalConverter
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);
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}
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/**
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* Add a converter (添加转换器)
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* @param fn Converter function (转换器函数)
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*/
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use(fn) {
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this.converters.push(fn);
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return this;
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}
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/**
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* Format a log event (格式化日志事件)
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* @param event Log event (日志事件)
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*/
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format(event) {
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return this.converters.map((converter) => converter(event)).join("");
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}
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}
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module.exports = PatternLayout;
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