ionic-logging-service
Version:
Logging functionalities for apps built with Ionic framework
177 lines • 19.7 kB
JavaScript
import * as log4javascript from "log4javascript";
import { LogLevelConverter } from "./log-level.converter";
import { LogLevel } from "./log-level.model";
/**
* An appender which stores the log messages in the browser's local storage.
*
* The messages are saved JSON-serialized.
* You have to configure which key is used for storing the messages.
*
* A typical configuration could be:
*
* ```json
* {
* "localStorageKey": "myLogs",
* "maxMessages": 500,
* "threshold": "INFO"
* }
* ```
*/
export class LocalStorageAppender extends log4javascript.Appender {
static { this.maxMessagesDefault = 250; }
static { this.thresholdDefault = "WARN"; }
/**
* Creates a new instance of the appender.
*
* @param configuration configuration for the appender.
*/
constructor(configuration) {
super();
if (!configuration) {
throw new Error("configuration must be not empty");
}
if (!configuration.localStorageKey || configuration.localStorageKey === "") {
throw new Error("localStorageKey must be not empty");
}
this.localStorageKey = configuration.localStorageKey;
// read existing logMessages
this.logMessages = LocalStorageAppender.loadLogMessages(this.localStorageKey);
// process remaining configuration
this.configure({
localStorageKey: configuration.localStorageKey,
maxMessages: configuration.maxMessages || LocalStorageAppender.maxMessagesDefault,
threshold: configuration.threshold || LocalStorageAppender.thresholdDefault,
});
}
/**
* Load log messages from local storage which are stored there under the given key.
*
* @param localStorageKey local storage key
* @return stored messages
*/
static loadLogMessages(localStorageKey) {
let logMessages;
if (!localStorageKey || localStorage.getItem(localStorageKey) === null) {
logMessages = [];
}
else {
logMessages = JSON.parse(localStorage.getItem(localStorageKey));
for (const logMessage of logMessages) {
// timestamps are serialized as strings
logMessage.timeStamp = new Date(logMessage.timeStamp);
}
}
return logMessages;
}
/**
* Remove log messages from local storage which are stored there under the given key.
*
* @param localStorageKey local storage key
*/
static removeLogMessages(localStorageKey) {
localStorage.removeItem(localStorageKey);
}
/**
* Configures the logging depending on the given configuration.
*
* Only the defined properties get overwritten.
* The localStorageKey cannot be modified.
*
* @param configuration configuration data.
*/
configure(configuration) {
if (configuration) {
if (configuration.localStorageKey && configuration.localStorageKey !== this.localStorageKey) {
throw new Error("localStorageKey must not be changed");
}
if (configuration.maxMessages) {
this.setMaxMessages(configuration.maxMessages);
}
if (configuration.threshold) {
const convertedThreshold = LogLevelConverter.levelToLog4Javascript(LogLevelConverter.levelFromString(configuration.threshold));
this.setThreshold(convertedThreshold);
}
}
}
/**
* Appender-specific method to append a log message.
*
* @param loggingEvent event to be appended.
*/
append(loggingEvent) {
// if logMessages is already full, remove oldest element
while (this.logMessages.length >= this.maxMessages) {
this.logMessages.shift();
}
// add event to logMessages
const message = {
level: LogLevel[LogLevelConverter.levelFromLog4Javascript(loggingEvent.level)],
logger: typeof loggingEvent.logger !== "undefined" ? loggingEvent.logger.name : undefined,
message: loggingEvent.messages.slice(1),
methodName: loggingEvent.messages[0],
timeStamp: loggingEvent.timeStamp,
};
this.logMessages.push(message);
// write values to localStorage
localStorage.setItem(this.localStorageKey, JSON.stringify(this.logMessages));
}
/**
* Gets the appender's name.
* Mainly for unit testing purposes.
*
* @return appender's name
*/
toString() {
return "Ionic.Logging.LocalStorageAppender";
}
/**
* Get the key which is used to store the messages in the local storage.
*/
getLocalStorageKey() {
return this.localStorageKey;
}
/**
* Get the maximum number of messages which will be stored in local storage.
*/
getMaxMessages() {
return this.maxMessages;
}
/**
* Set the maximum number of messages which will be stored in local storage.
*
* If the appender stores currently more messages than the new value allows, the oldest messages get removed.
*
* @param value new maximum number
*/
setMaxMessages(value) {
if (this.maxMessages !== value) {
this.maxMessages = value;
if (this.logMessages.length > this.maxMessages) {
// there are too much logMessages for the new value, therefore remove oldest messages
while (this.logMessages.length > this.maxMessages) {
this.logMessages.shift();
}
// write values to localStorage
localStorage.setItem(this.localStorageKey, JSON.stringify(this.logMessages));
}
}
}
/**
* Gets all messages stored in local storage.
* Mainly for unit testing purposes.
*
* @return stored messages
*/
getLogMessages() {
return this.logMessages;
}
/**
* Removes all messages from local storage.
* Mainly for unit testing purposes.
*/
clearLog() {
this.logMessages = [];
localStorage.removeItem(this.localStorageKey);
}
}
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* as log4javascript from \"log4javascript\";\n\nimport { LocalStorageAppenderConfiguration } from \"./local-storage-appender.configuration\";\nimport { LogLevelConverter } from \"./log-level.converter\";\nimport { LogLevel } from \"./log-level.model\";\nimport { LogMessage } from \"./log-message.model\";\n\n/**\n * An appender which stores the log messages in the browser's local storage.\n *\n * The messages are saved JSON-serialized.\n * You have to configure which key is used for storing the messages.\n *\n * A typical configuration could be:\n *\n * ```json\n * {\n *   \"localStorageKey\": \"myLogs\",\n *   \"maxMessages\": 500,\n *   \"threshold\": \"INFO\"\n * }\n * ```\n */\nexport class LocalStorageAppender extends log4javascript.Appender {\n\n\tprivate static maxMessagesDefault = 250;\n\tprivate static thresholdDefault = \"WARN\";\n\n\tprivate maxMessages: number;\n\n\tprivate localStorageKey: string;\n\tprivate logMessages: LogMessage[];\n\n\t/**\n\t * Creates a new instance of the appender.\n\t *\n\t * @param configuration configuration for the appender.\n\t */\n\tconstructor(configuration: LocalStorageAppenderConfiguration) {\n\t\tsuper();\n\n\t\tif (!configuration) {\n\t\t\tthrow new Error(\"configuration must be not empty\");\n\t\t}\n\t\tif (!configuration.localStorageKey || configuration.localStorageKey === \"\") {\n\t\t\tthrow new Error(\"localStorageKey must be not empty\");\n\t\t}\n\t\tthis.localStorageKey = configuration.localStorageKey;\n\n\t\t// read existing logMessages\n\t\tthis.logMessages = LocalStorageAppender.loadLogMessages(this.localStorageKey);\n\n\t\t// process remaining configuration\n\t\tthis.configure({\n\t\t\tlocalStorageKey: configuration.localStorageKey,\n\t\t\tmaxMessages: configuration.maxMessages || LocalStorageAppender.maxMessagesDefault,\n\t\t\tthreshold: configuration.threshold || LocalStorageAppender.thresholdDefault,\n\t\t});\n\t}\n\n\t/**\n\t * Load log messages from local storage which are stored there under the given key.\n\t *\n\t * @param localStorageKey local storage key\n\t * @return stored messages\n\t */\n\tpublic static loadLogMessages(localStorageKey: string): LogMessage[] {\n\t\tlet logMessages: LogMessage[];\n\n\t\tif (!localStorageKey || localStorage.getItem(localStorageKey) === null) {\n\t\t\tlogMessages = [];\n\t\t} else {\n\t\t\tlogMessages = JSON.parse(localStorage.getItem(localStorageKey));\n\t\t\tfor (const logMessage of logMessages) {\n\t\t\t\t// timestamps are serialized as strings\n\t\t\t\tlogMessage.timeStamp = new Date(logMessage.timeStamp);\n\t\t\t}\n\t\t}\n\n\t\treturn logMessages;\n\t}\n\n\t/**\n\t * Remove log messages from local storage which are stored there under the given key.\n\t *\n\t * @param localStorageKey local storage key\n\t */\n\tpublic static removeLogMessages(localStorageKey: string): void {\n\t\tlocalStorage.removeItem(localStorageKey);\n\t}\n\n\t/**\n\t * Configures the logging depending on the given configuration.\n\t *\n\t * Only the defined properties get overwritten.\n\t * The localStorageKey cannot be modified.\n\t *\n\t * @param configuration configuration data.\n\t */\n\tpublic configure(configuration: LocalStorageAppenderConfiguration): void {\n\t\tif (configuration) {\n\t\t\tif (configuration.localStorageKey && configuration.localStorageKey !== this.localStorageKey) {\n\t\t\t\tthrow new Error(\"localStorageKey must not be changed\");\n\t\t\t}\n\t\t\tif (configuration.maxMessages) {\n\t\t\t\tthis.setMaxMessages(configuration.maxMessages);\n\t\t\t}\n\t\t\tif (configuration.threshold) {\n\t\t\t\tconst convertedThreshold = LogLevelConverter.levelToLog4Javascript(\n\t\t\t\t\tLogLevelConverter.levelFromString(configuration.threshold));\n\t\t\t\tthis.setThreshold(convertedThreshold);\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Appender-specific method to append a log message.\n\t *\n\t * @param loggingEvent event to be appended.\n\t */\n\tpublic append(loggingEvent: log4javascript.LoggingEvent): void {\n\t\t// if logMessages is already full, remove oldest element\n\t\twhile (this.logMessages.length >= this.maxMessages) {\n\t\t\tthis.logMessages.shift();\n\t\t}\n\t\t// add event to logMessages\n\t\tconst message: LogMessage = {\n\t\t\tlevel: LogLevel[LogLevelConverter.levelFromLog4Javascript(loggingEvent.level)],\n\t\t\tlogger: typeof loggingEvent.logger !== \"undefined\" ? loggingEvent.logger.name : undefined,\n\t\t\tmessage: loggingEvent.messages.slice(1),\n\t\t\tmethodName: loggingEvent.messages[0],\n\t\t\ttimeStamp: loggingEvent.timeStamp,\n\t\t};\n\t\tthis.logMessages.push(message);\n\n\t\t// write values to localStorage\n\t\tlocalStorage.setItem(this.localStorageKey, JSON.stringify(this.logMessages));\n\t}\n\n\t/**\n\t * Gets the appender's name.\n\t * Mainly for unit testing purposes.\n\t *\n\t * @return appender's name\n\t */\n\tpublic toString(): string {\n\t\treturn \"Ionic.Logging.LocalStorageAppender\";\n\t}\n\n\t/**\n\t * Get the key which is used to store the messages in the local storage.\n\t */\n\tpublic getLocalStorageKey(): string {\n\t\treturn this.localStorageKey;\n\t}\n\n\t/**\n\t * Get the maximum number of messages which will be stored in local storage.\n\t */\n\tpublic getMaxMessages(): number {\n\t\treturn this.maxMessages;\n\t}\n\n\t/**\n\t * Set the maximum number of messages which will be stored in local storage.\n\t *\n\t * If the appender stores currently more messages than the new value allows, the oldest messages get removed.\n\t *\n\t * @param value new maximum number\n\t */\n\tpublic setMaxMessages(value: number): void {\n\t\tif (this.maxMessages !== value) {\n\t\t\tthis.maxMessages = value;\n\n\t\t\tif (this.logMessages.length > this.maxMessages) {\n\t\t\t\t// there are too much logMessages for the new value, therefore remove oldest messages\n\t\t\t\twhile (this.logMessages.length > this.maxMessages) {\n\t\t\t\t\tthis.logMessages.shift();\n\t\t\t\t}\n\n\t\t\t\t// write values to localStorage\n\t\t\t\tlocalStorage.setItem(this.localStorageKey, JSON.stringify(this.logMessages));\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Gets all messages stored in local storage.\n\t * Mainly for unit testing purposes.\n\t *\n\t * @return stored messages\n\t */\n\tpublic getLogMessages(): LogMessage[] {\n\t\treturn this.logMessages;\n\t}\n\n\t/**\n\t * Removes all messages from local storage.\n\t * Mainly for unit testing purposes.\n\t */\n\tpublic clearLog(): void {\n\t\tthis.logMessages = [];\n\t\tlocalStorage.removeItem(this.localStorageKey);\n\t}\n}\n"]}