502 lines
26 KiB
JavaScript
502 lines
26 KiB
JavaScript
exports.newFileStorage = function newFileStorage(processIndex, host, port) {
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const ip = require("ip");
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const MODULE_NAME = 'FileStorage'
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const MAX_RETRY = 10
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const FAST_RETRY_TIME_IN_MILISECONDS = 500
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const SLOW_RETRY_TIME_IN_MILISECONDS = 2000
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let thisObject = {
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asyncGetTextFile: asyncGetTextFile,
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asyncCreateTextFile: asyncCreateTextFile,
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getTextFile: getTextFile,
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createTextFile: createTextFile,
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deleteTextFile: deleteTextFile
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}
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let logger
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if (TS.projects.foundations.globals.loggerVariables.VARIABLES_BY_PROCESS_INDEX_MAP.get(processIndex).BOT_MAIN_LOOP_LOGGER_MODULE_OBJECT === undefined) { // Dummy logger
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logger = {}
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function write() {
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}
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logger.write = write
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} else {
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logger = TS.projects.foundations.globals.loggerVariables.VARIABLES_BY_PROCESS_INDEX_MAP.get(processIndex).BOT_MAIN_LOOP_LOGGER_MODULE_OBJECT
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}
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return thisObject
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async function asyncGetTextFile(filePath, noRetry, canUsePrevious) {
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/* This function allows its caller to work with async / await instead of callbacks */
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let promise = new Promise((resolve, reject) => {
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getTextFile(filePath, onFileRead, noRetry, canUsePrevious)
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function onFileRead(err, text) {
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let response = {
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err: err,
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text: text
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}
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resolve(response)
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}
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})
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return promise
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}
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async function asyncCreateTextFile(filePath, fileContent, keepPrevious, noTemp) {
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/* This function allows its caller to work with async / await instead of callbacks */
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let promise = new Promise((resolve, reject) => {
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createTextFile(filePath, fileContent, onFileWriten, keepPrevious, noTemp)
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function onFileWriten(err) {
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let response = {
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err: err
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}
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resolve(response)
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}
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})
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return promise
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}
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function getTextFile(filePath, callBackFunction, noRetry, canUsePrevious) {
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let currentRetryGetTextFile = 0
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recursiveGetTextFile(filePath, callBackFunction, noRetry, canUsePrevious)
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function recursiveGetTextFile(filePath, callBackFunction, noRetry, canUsePrevious) {
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let fileDoesNotExist = false
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/* Choose path for either bots or data */
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let fileLocation
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let mustBeJason
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if (filePath.indexOf("/bots/") > 0) {
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fileLocation = global.env.PATH_TO_PROJECTS + '/' + filePath
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mustBeJason = false
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} else {
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fileLocation = global.env.PATH_TO_DATA_STORAGE + '/' + filePath
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mustBeJason = true
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}
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try {
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logger.write(MODULE_NAME, '[INFO] FileStorage -> getTextFile -> fileLocation: ' + fileLocation)
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/* Here we actually reaad the file. */
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if (host === undefined || host === 'localhost' || host === ip.address() || host === '127.0.0.1') {
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/* We read the file from the local file system. */
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const fs = require('fs')
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fs.readFile(fileLocation, onFileRead)
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} else {
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/* We read the file via a web server over http */
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getFileViaHTTP(fileLocation, onFileRead, callBackFunction)
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}
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function onFileRead(err, text) {
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let retryTimeToUse = FAST_RETRY_TIME_IN_MILISECONDS
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if (currentRetryGetTextFile > MAX_RETRY - 2) {
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retryTimeToUse = SLOW_RETRY_TIME_IN_MILISECONDS
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}
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if (err) {
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if (err.code === 'ENOENT') { // since files are deleted before being replaced, it can happen that it does not exist and after a retry it does.
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if (noRetry === true) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> File does not exist. Not Retrying. ')
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let customResponse = {
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result: TS.projects.foundations.globals.standardResponses.CUSTOM_FAIL_RESPONSE.result,
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message: 'File does not exist.'
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}
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callBackFunction(customResponse)
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return
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}
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fileDoesNotExist = true
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> File does not exist. Retrying. ')
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setTimeout(retry, retryTimeToUse)
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return
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}
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> Error reading file -> err = ' + err.stack)
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> Error reading file -> filePath = ' + filePath)
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> Error reading file -> err = ' + err.stack)
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setTimeout(retry, retryTimeToUse)
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return
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}
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/*
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It might happen that we try to read a file just at the moment it is being written by another process. It that case we might get
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an empty file. If we are not allowed to use the Previous version of the file in this case, then we will retry to read it again
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a little bit later.
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*/
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if (text.toString() === "" && canUsePrevious !== true) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> Read and Empty File -> filePath = ' + filePath)
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setTimeout(retry, retryTimeToUse)
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return
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}
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if (mustBeJason === false) {
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/* In this case there is nothing else to check. */
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_OK_RESPONSE, text.toString())
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return
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}
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/*
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We are going to check if the file is a valir JSON object
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*/
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try {
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let jsonCheck = JSON.parse(text.toString())
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/* The file was correctly read and could be parsed. */
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_OK_RESPONSE, text.toString())
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return
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} catch (err) {
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if (canUsePrevious === true) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> Could read the file, but could not parse it as it is not a valid JSON. Will try to read the PREVIOUS version instead. -> file = ' + fileLocation)
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if (host === undefined || host === 'localhost' || host === ip.address() || host === '127.0.0.1') {
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/* We read the file from the local file system. */
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const fs = require('fs')
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fs.readFile(fileLocation + '.Previous.json', onPreviousFileRead)
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} else {
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/* We read the file via a web server over http */
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getFileViaHTTP(fileLocation + '.Previous.json', onPreviousFileRead, callBackFunction)
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}
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function onPreviousFileRead(err, text) {
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if (err) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> canUsePrevious -> Could not read the Previous file either. Giving up.')
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> canUsePrevious -> err = ' + err.stack)
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_FAIL_RESPONSE)
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return
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}
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/* Returning the previous file */
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_OK_RESPONSE, text.toString())
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return
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}
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} else {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> Could read the file, but could not parse it as it is not a valid JSON.')
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> err = ' + err.stack)
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> onFileRead -> text.toString() = ' + text.toString())
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setTimeout(retry, retryTimeToUse)
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return
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}
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}
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}
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} catch (err) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> Error reading file -> file = ' + fileLocation)
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> Error reading file -> err = ' + err.stack)
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retry()
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}
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function retry() {
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if (currentRetryGetTextFile < MAX_RETRY) {
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currentRetryGetTextFile++
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logger.write(MODULE_NAME, '[INFO] FileStorage -> getTextFile -> retry -> Will try to read the file again -> Retry #: ' + currentRetryGetTextFile)
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recursiveGetTextFile(filePath, callBackFunction, noRetry, canUsePrevious)
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} else {
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currentRetryGetTextFile = 0
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if (fileDoesNotExist === true) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> getTextFile -> retry -> Max retries reached reading a file. File Not Found.')
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let customResponse = {
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result: TS.projects.foundations.globals.standardResponses.CUSTOM_FAIL_RESPONSE.result,
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message: 'File does not exist.'
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}
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callBackFunction(customResponse)
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return
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} else {
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logger.write(MODULE_NAME, '[ERROR] FileStorage -> getTextFile -> retry -> Max retries reached reading a file. Giving up.')
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logger.write(MODULE_NAME, '[ERROR] FileStorage -> getTextFile -> retry -> file = ' + fileLocation)
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_FAIL_RESPONSE)
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return
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}
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}
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}
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}
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}
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function createTextFile(filePath, fileContent, callBackFunction, keepPrevious, noTemp) {
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let currentRetryWriteTextFile = 0
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recursiveCreateTextFile(filePath, fileContent, callBackFunction, keepPrevious, noTemp)
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function recursiveCreateTextFile(filePath, fileContent, callBackFunction, keepPrevious, noTemp) {
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/* Choose path for either logs or data */
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let fileLocation
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if (filePath.indexOf("/Logs/") > 0) {
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fileLocation = global.env.PATH_TO_LOG_FILES + '/' + filePath
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} else {
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fileLocation = global.env.PATH_TO_DATA_STORAGE + '/' + filePath
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}
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try {
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logger.write(MODULE_NAME, '[INFO] FileStorage -> createTextFile -> fileLocation: ' + fileLocation)
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/* If necesary a folder or folders are created before writing the file to disk. */
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TS.projects.foundations.utilities.miscellaneousFunctions.mkDirByPathSync(fileLocation)
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/*
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Here we write the file with a temporary name so as to avoid dirty read from other processes.
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Then we delete the original file, if exists, and finally we rename the temporary into the original name.
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*/
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const fs = require('fs')
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if (noTemp === true) {
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fs.writeFile(fileLocation, fileContent, onFileWriten)
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} else {
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fs.writeFile(fileLocation + '.tmp', fileContent, onFileWriten)
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}
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function onFileWriten(err) {
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let retryTimeToUse = FAST_RETRY_TIME_IN_MILISECONDS
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if (currentRetryWriteTextFile > MAX_RETRY - 2) {
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retryTimeToUse = SLOW_RETRY_TIME_IN_MILISECONDS
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}
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if (err) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> Error writing file -> file = ' + fileLocation + '.tmp')
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> Error writing file -> err = ' + err.stack)
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setTimeout(retry, retryTimeToUse)
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} else {
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if (noTemp === true) {
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_OK_RESPONSE)
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return
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}
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if (keepPrevious === true) {
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/*
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In some cases, we are going to keep a copy of the previous version of the file being written. This will be usefull to recover from crashes
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when the file written gets corrupted for any reason.
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*/
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fs.unlink(fileLocation + '.Previous.json', onUnlinked)
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function onUnlinked(err) {
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let code = ''
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if (err) {
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code = err.code
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}
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if (code !== '' && code !== 'ENOENT') {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> onUnlinked -> Error deleting file -> file = ' + fileLocation + '.Previous.json')
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> onUnlinked -> Error deleting file -> err = ' + err.stack)
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setTimeout(retry, retryTimeToUse)
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return
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}
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/* Rename de Original into Previous */
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fs.rename(fileLocation, fileLocation + '.Previous.json', onOriginalRenamed)
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function onOriginalRenamed(err) {
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let code = ''
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if (err) {
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code = err.code
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}
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if (code !== '' && code !== 'ENOENT') { // Unless the file does not exists we do this...
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> onUnlinked -> onOriginalRenamed -> Error renaming original file -> file = ' + fileLocation)
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> onUnlinked -> onOriginalRenamed -> Error renaming original file -> err = ' + err.stack)
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setTimeout(retry, retryTimeToUse)
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return
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}
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/* Rename de Temp into Original */
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fs.rename(fileLocation + '.tmp', fileLocation, onTempRenamed)
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function onTempRenamed(err) {
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if (err) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> onUnlinked -> onOriginalRenamed -> onTempRenamed -> Error renaming temp file -> file = ' + fileLocation + '.tmp')
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> onUnlinked -> onOriginalRenamed -> onTempRenamed -> Error renaming temp file -> err = ' + err.stack)
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setTimeout(retry, retryTimeToUse)
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} else {
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_OK_RESPONSE)
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}
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}
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}
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}
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} else {
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/* In this case, there is no need to keep a copy of the file being replaced, so we just delete and that's it. */
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fs.unlink(fileLocation, onUnlinked)
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function onUnlinked(err) {
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let code = ''
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if (err) {
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code = err.code
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}
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if (code !== '' && code !== 'ENOENT') {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> onUnlinked -> Error deleting file -> file = ' + fileLocation)
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> onUnlinked -> Error deleting file -> err = ' + err.stack)
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setTimeout(retry, retryTimeToUse)
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return
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}
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/* Rename de Temp into Original */
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fs.rename(fileLocation + '.tmp', fileLocation, onTempRenamed)
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function onTempRenamed(err) {
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if (err) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> onUnlinked -> onOriginalRenamed -> onTempRenamed -> Error renaming temp file -> file = ' + fileLocation + '.tmp')
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> onFileWriten -> onUnlinked -> onOriginalRenamed -> onTempRenamed -> Error renaming temp file -> err = ' + err.stack)
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setTimeout(retry, retryTimeToUse)
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} else {
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_OK_RESPONSE)
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}
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}
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}
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}
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}
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}
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} catch (err) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> Error writing file -> file = ' + fileLocation)
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logger.write(MODULE_NAME, '[WARN] FileStorage -> createTextFile -> Error writing file -> err = ' + err.stack)
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retry()
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}
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function retry() {
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if (currentRetryWriteTextFile < MAX_RETRY) {
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currentRetryWriteTextFile++
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logger.write(MODULE_NAME, '[INFO] FileStorage -> createTextFile -> retry -> Will try to write the file again -> Retry #: ' + currentRetryWriteTextFile)
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recursiveCreateTextFile(filePath, fileContent, callBackFunction, keepPrevious)
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} else {
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currentRetryWriteTextFile = 0
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logger.write(MODULE_NAME, '[ERROR] FileStorage -> createTextFile -> retry -> Max retries reached writing a file. Giving up.')
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logger.write(MODULE_NAME, '[ERROR] FileStorage -> createTextFile -> retry -> file = ' + fileLocation)
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_FAIL_RESPONSE)
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}
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}
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}
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}
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function deleteTextFile(filePath, callBackFunction) {
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let currentRetryDeleteTextFile = 0
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recursiveDeleteTextFile(filePath, callBackFunction)
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function recursiveDeleteTextFile(filePath, callBackFunction) {
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logger.write(MODULE_NAME, '[INFO] FileStorage -> deleteTextFile -> Entering Function.')
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/* Choose path for either logs or data */
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let fileLocation
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if (filePath.indexOf("/Logs/") > 0) {
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fileLocation = global.env.PATH_TO_LOG_FILES + '/' + filePath
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} else {
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fileLocation = global.env.PATH_TO_DATA_STORAGE + '/' + filePath
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}
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try {
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logger.write(MODULE_NAME, '[INFO] FileStorage -> deleteTextFile -> fileLocation: ' + fileLocation)
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const fs = require('fs')
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fs.unlink(fileLocation, onUnlinked)
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function onUnlinked(err) {
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let retryTimeToUse = FAST_RETRY_TIME_IN_MILISECONDS
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if (currentRetryDeleteTextFile > MAX_RETRY - 2) {
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retryTimeToUse = SLOW_RETRY_TIME_IN_MILISECONDS
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}
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if (err) {
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if (callBackFunction !== undefined) {
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_FAIL_RESPONSE)
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}
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} else {
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setTimeout(retry, retryTimeToUse)
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}
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}
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} catch (err) {
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logger.write(MODULE_NAME, '[WARN] FileStorage -> deleteTextFile -> Error writing file -> file = ' + fileLocation)
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logger.write(MODULE_NAME, '[WARN] FileStorage -> deleteTextFile -> Error writing file -> err = ' + err.stack)
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if (callBackFunction !== undefined) {
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_FAIL_RESPONSE)
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}
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}
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function retry() {
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if (currentRetryDeleteTextFile < MAX_RETRY) {
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currentRetryDeleteTextFile++
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logger.write(MODULE_NAME, '[INFO] FileStorage -> deleteTextFile -> retry -> Will try to delete the file again -> Retry #: ' + currentRetryDeleteTextFile)
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recursiveDeleteTextFile(filePath, callBackFunction)
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} else {
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currentRetryDeleteTextFile = 0
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logger.write(MODULE_NAME, '[ERROR] FileStorage -> deleteTextFile -> retry -> Max retries reached deleting a file. Giving up.')
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logger.write(MODULE_NAME, '[ERROR] FileStorage -> deleteTextFile -> retry -> file = ' + fileLocation)
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if (callBackFunction !== undefined) {
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callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_OK_RESPONSE)
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}
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}
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}
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}
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}
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function getFileViaHTTP(filePath, callback, callBackFunction) {
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try {
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/* The filePath received is the one that is needed to fetch data from with fs. To do it via http we need to remove the prefix that includes this: ./Data-Storage/ */
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filePath = filePath.substring(15, filePath.length)
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let http = require('http');
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let url = 'http://' + host +
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':' + port +
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'/Storage/' +
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filePath
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logger.write(MODULE_NAME, '[INFO] FileStorage -> getFileViaHTTP -> url = ' + url)
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let request = http.get(url, onResponse);
|
|
|
|
request.on('error', function (err) {
|
|
logger.write(MODULE_NAME, "[ERROR] getFileViaHTTP -> onError -> err = " + err.stack);
|
|
logger.write(MODULE_NAME, "[ERROR] getFileViaHTTP -> onError -> Failed to fetch file via HTTP. Will retry later. ");
|
|
callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_RETRY_RESPONSE);
|
|
})
|
|
|
|
function onResponse(response) {
|
|
|
|
try {
|
|
const chunks = []
|
|
|
|
response.on('data', onMessegesArrived)
|
|
response.on('end', onEnd)
|
|
|
|
function onMessegesArrived(chunk) {
|
|
chunks.push(chunk)
|
|
}
|
|
|
|
function onEnd() {
|
|
let fileContent = Buffer.concat(chunks).toString('utf8')
|
|
let err = null
|
|
if (fileContent.indexOf('does not exist') >= 0) {
|
|
err = {
|
|
code: "ENOENT" // This is how fs would have returned upon this situation.
|
|
}
|
|
fileContent = undefined
|
|
}
|
|
callback(err, fileContent)
|
|
}
|
|
} catch (err) {
|
|
logger.write(MODULE_NAME, "[ERROR] getFileViaHTTP -> onResponse -> err = " + err.stack);
|
|
logger.write(MODULE_NAME, "[ERROR] getFileViaHTTP -> onResponse -> Failed to fetch file via HTTP. Will retry later. ");
|
|
callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_RETRY_RESPONSE);
|
|
}
|
|
}
|
|
} catch (err) {
|
|
logger.write(MODULE_NAME, "[ERROR] getFileViaHTTP -> err = " + err.stack);
|
|
logger.write(MODULE_NAME, "[ERROR] getFileViaHTTP -> Failed to fetch file via HTTP. Will retry later. ");
|
|
callBackFunction(TS.projects.foundations.globals.standardResponses.DEFAULT_RETRY_RESPONSE);
|
|
}
|
|
}
|
|
}
|