set up jest for your typescript project and how to import txt files in your unit tests

Getting Started

These instructions will get you setup to use ts-jest in your project. For more detailed documentation, please check online documentation.

	using npm	using yarn
Prerequisites	`npm i -D jest typescript`	`yarn add --dev jest typescript`
Installing	`npm i -D ts-jest @types/jest`	`yarn add --dev ts-jest @types/jest`
Creating config	`npx ts-jest config:init`	`yarn ts-jest config:init`
Running tests	`npm t` or `npx jest`	`yarn test` or `yarn jest`

to import txt file as string, via jest-raw-loader

/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
module.exports = {
  preset: 'ts-jest',
  testEnvironment: 'node',
  "transform": {
    "\\.txt$": "jest-raw-loader"
  }
};

or follow https://nextjs.org/docs/testing if you are using next.js

https://www.npmjs.com/package/jest-raw-loader

https://github.com/kulshekhar/ts-jest

https://jestjs.io/zh-Hans/docs/getting-started

https://jestjs.io/docs/configuration#transform-objectstring-pathtotransformer--pathtotransformer-object

Import txt files as string into your next.js App

import file from './xxx.txt'

Webpack 5 has 'Asset Modules' to allow you to import assets without configuring loaders now.

Next.js use Webpack 5 internally, so we can use 'source assets' to import txt files as strings.

Two steps to let you be able to import a txt file as a string.

custom Webpack config for next.js

        config.module.rules.push({
            test: /\.txt$/i,
            type: 'asset/source'
        })

declare txt as a module for typescript

Wildcard module declarations can be used to cover these cases.

declare module '*.txt' {
  const content: string;
  export default content;
}

example

import t1 from './1.txt'
console.log(t1)

output

event - compiled successfully

离开罪之路的人蒙祝福，

他不去随从恶人的计谋，

他不会站在罪人的道路上，

也不去坐好讥笑人的座位，

他喜爱的是耶和华律法，

昼夜默诵的也是他律法。

The full commit to enabling import txt files in your next.js app

references

Use SODA for REST with OAuth Client Credentials in your Node.js or Web application to CRUD Oracle Autonomous Database

How to Internationalizing your Flutter apps ?

First Reading:

https://flutter.dev/docs/development/accessibility-and-localization/internationalization

Steps:

1. add flutter_localizations dependencies into pubspec.yaml

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter

2. add localizationsDelegates and supportedLocales into MaterialApp

Applocalizations.delegate is your app-specific localization delegate.

will be introduced in next step.

Widget build(BuildContext context) {

    return MaterialApp(
      localizationsDelegates: [
        AppLocalizations.delegate,
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      supportedLocales: [
        const Locale.fromSubtags(languageCode: 'zh'), // generic Chinese 'zh'
        const Locale.fromSubtags(
            languageCode: 'zh',
            scriptCode: 'Hans'), // generic simplified Chinese 'zh_Hans'
        const Locale.fromSubtags(
            languageCode: 'zh',
            scriptCode: 'Hant'), // generic traditional Chinese 'zh_Hant'
        const Locale.fromSubtags(
            languageCode: 'zh',
            scriptCode: 'Hans',
            countryCode: 'CN'), // 'zh_Hans_CN'
        const Locale.fromSubtags(
            languageCode: 'zh',
            scriptCode: 'Hant',
            countryCode: 'TW'), // 'zh_Hant_TW'
        const Locale.fromSubtags(
            languageCode: 'zh',
            scriptCode: 'Hant',
            countryCode: 'HK'), // 'zh_Hant_HK'
        const Locale('en', ''),
      ],

3. Defining your own class for the app's localized resources

import 'package:flutter/material.dart';

import 'app_localizations_delegate.dart';

class AppLocalizations {
  AppLocalizations(this.locale);

  final Locale locale;

  static AppLocalizations of(BuildContext context) {
    return Localizations.of<AppLocalizations>(context, AppLocalizations);
  }

  static Map<String, Map<String, String>> _localizedValues = {
    'zh': {
      'appTitle': '海德堡要理问答',
    },
    'en': {
      'appTitle': 'The Heidelberg Catechism',
    },
  };

  String get appTitle {
    return _localizedValues[locale.languageCode]['appTitle'];
  }

  static const LocalizationsDelegate<AppLocalizations> delegate =
      AppLocalizationsDelegate();
}

import 'package:TheHeidelbergCatechism/i18n/app_localizations.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

class AppLocalizationsDelegate extends LocalizationsDelegate<AppLocalizations> {
  const AppLocalizationsDelegate();

  @override
  bool isSupported(Locale locale) => ['en', 'zh'].contains(locale.languageCode);

  @override
  Future<AppLocalizations> load(Locale locale) {
    print(locale.languageCode);
    return SynchronousFuture<AppLocalizations>(AppLocalizations(locale));
  }

  @override
  bool shouldReload(AppLocalizationsDelegate old) => false;
}

4. Use AppLocalizations

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(AppLocalizations.of(context).appTitle),
      ),

Demo:

How to measure the maximum throughput (TPS - Transactions per Second) that a single website instance(host) can handle via curl tool ?

tps.py, a python script using curl to measure the time per transaction requested to your website

curl --connect-timeout 10 --max-time 10 -o /dev/null -s -w "%{http_code},%{size_download},%{time_appconnect},%{time_connect},%{time_namelookup},%{time_pretransfer},%{time_starttransfer},%{time_total}" -k

#!/usr/bin/python
#-*- coding: UTF-8 -*-

import commands
import getopt
import os
import re
import sys
import thread
import threading
import time

def help(code):
print 'tps.py -A "useragent" -C "cookies" -H "header" -P "period" -T "tps" -U "url" -O "outputdir"'
print 'examples:'
print 'tps.py -U https://www.amazon.com -T 20 -P PT5M'
print 'tps.py -U https://www.amazon.com -T 20 -P PT1H'
sys.exit(code)

def check_args(a, c, h, p, t, u, o):
if u == '':
print 'no URL specified!'
help(2)
if t == '':
print 'no TPS specified!'
help(2)
if p == '':
print 'no PERIOD specified!'
help(2)
cmd = 'curl --connect-timeout 10 --max-time 10 -o /dev/null -s -w "%{http_code},%{size_download},%{time_appconnect},%{time_connect},%{time_namelookup},%{time_pretransfer},%{time_starttransfer},%{time_total}" -k'
if not a == '':
cmd = cmd + " -A \"" + a + "\""
if not c == '':
cmd = cmd + " -b \"" + c + "\""
if not h == '':
cmd = cmd + " -H \"" + h + "\""
cmd = cmd + " " + u
fp = os.getcwd() + '/tps.csv'
if not o == '':
fp = o + "/tps.csv"
tpspt(cmd, t, p, fp)

def tpspt(cmd, t, p, fp):
f = open(fp, 'w+')
if not f:
print "fail to create tps.csv under ", os.getcwd()
sys.exit(1)

m = re.match('^PT(\d+)[MH]$', p)
if not m:
print ' wrong PERIOD pattern!', p , 'not match "PT\d+[MH]"'
help(2)
m = int(m.group(1))
if p[-1] == 'H':
m = m * 60 * 60
else:
m = m * 60
t = float(t)
print "-tps", t, "-period", p, ",", int(m * t), "transactions will be executed!"
print cmd
start = time.time()
wq = []
ths = []
maxm = m
if t < 1:
maxm = int(m*t)
for x in range(0, maxm):
if t < 1:
thargs = [cmd, t, wq, int(x/t) + 1]
th = threading.Timer(int(x/t) + 1, tps, thargs)
else:
thargs = [cmd, t, wq, x + 1]
th = threading.Timer(x + 1, tps, thargs)
th.start()
ths.append(th)
for th in ths:
th.join()
end = time.time()
print "Finish ", int(m * t), "transactions in", int(end - start), "seconds!"
print "Writing results to tps.csv ......"
f.write("id,http_code,size_download,time_appconnect,time_connect,time_namelookup,time_pretransfer,time_starttransfer,time_total")
f.write('\n')
for line in wq:
f.write(line)
f.close()
print "Done! Please check results in", fp

def tps(cmd, t, wq, x):
print "execute", t, "transactions at the ", x, "seconds"
while t > 0:
starttime = time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))
status, output = commands.getstatusoutput(cmd)
# sample output
# http_code,size_download,time_appconnect,time_connect,time_namelookup,time_pretransfer,time_starttransfer,time_total
# 200,79059,0.011196,0.000273,0.000214,0.011224,1.091032,5.055447
cells = output.split(",")
if len(cells) < 8:
print "ERROR!!!", output
continue;
cell0 = cells[0]
if not cell0 == '200':
print "WARNING!!!", cell0, "is not wanted response code!!!"
cell1 = cells[1]
cells = map(lambda x: float(x) * 1000, cells[2:])
cells.insert(0, float(cell1)/1024)
cells.insert(0, int(cell0))
cells = map(lambda x: str(x), cells)
cells.insert(0, starttime)
wq.append(','.join(cells))
wq.append('\n')
t = t - 1;

def main(argv):
useragent = ''
cookie = ''
header = ''
period = ''
tps = ''
url = ''
outputdir = ''

try:
opts, args = getopt.getopt(argv,"hA:C:H:O:P:T:U:",["useragent=","cookie=", "header=", "outputdir=", "period=", "tps=", "url="])
except getopt.GetoptError:
help(1)
for opt, arg in opts:
if opt == '-h':
help(0)
elif opt in ("-A", "--useragent"):
useragent = arg
elif opt in ("-C", "--cookie"):
cookie = arg
elif opt in ("-H", "--header"):
header = arg
elif opt in ("-P", "--period"):
period = arg
elif opt in ("-T", "--tps"):
tps = arg
elif opt in ("-U", "--url"):
url = arg
elif opt in ("-O", "--outputdir"):
outputdir = arg

check_args(useragent, cookie, header, period, tps, url, outputdir)

if __name__ == "__main__":

main(sys.argv[1:])

example usage:

./tps.py -T 10 -P "PT3M" -U https://errong.win 
-tps 10.0 -period PT3M , 1800 transactions will be executed!
curl --connect-timeout 10 --max-time 10 -o /dev/null -s -w "%{http_code},%{size_download},%{time_appconnect},%{time_connect},%{time_namelookup},%{time_pretransfer},%{time_starttransfer},%{time_total}" -k https://errong.win
.......
Finish  1800 transactions in 184 seconds!
Writing results to tps.csv ......
Done! Please check results in tps.csv

TPS Graph

As you can found, errong.win average responding time is about 420ms, not too bad.
TPS

curl -w manual

Make curl display information on stdout after a completed transfer. The format is a string that may contain plain text mixed with any number of variables. The format can be specified as a literal "string", or you can have curl read the format from a file with "@filename" and to tell curl to read the format from stdin you write "@-".
The variables present in the output format will be substituted by the value or text that curl thinks fit, as described below. All variables are specified as %{variable_name} and to output a normal % you just write them as %%. You can output a newline by using \n, a carriage return with \r and a tab space with \t.
NOTE: The %-symbol is a special symbol in the win32-environment, where all occurrences of % must be doubled when using this option.
The variables available are:

content_type
The Content-Type of the requested document, if there was any.
filename_effective
The ultimate filename that curl writes out to. This is only meaningful if curl is told to write to a file with the -O, --remote-name or -o, --output option. It's most useful in combination with the -J, --remote-header-name option.
ftp_entry_path
The initial path curl ended up in when logging on to the remote FTP server.
http_code
The numerical response code that was found in the last retrieved HTTP(S) or FTP(s) transfer.
http_connect
The numerical code that was found in the last response (from a proxy) to a curl CONNECT request. (Added in 7.12.4)
http_version
The http version that was effectively used.
local_ip
The IP address of the local end of the most recently done connection - can be either IPv4 or IPv6 (Added in 7.29.0)
local_port
The local port number of the most recently done connection (Added in 7.29.0)
num_connects
Number of new connects made in the recent transfer. (Added in 7.12.3)
num_redirects
Number of redirects that were followed in the request. (Added in 7.12.3)
proxy_ssl_verify_result
The result of the HTTPS proxy's SSL peer certificate verification that was requested. 0 means the verification was successful. (Added in 7.52.0)
redirect_url
When an HTTP request was made without -L to follow redirects, this variable will show the actual URL a redirect would take you to. (Added in 7.18.2)
remote_ip
The remote IP address of the most recently done connection - can be either IPv4 or IPv6 (Added in 7.29.0)
remote_port
The remote port number of the most recently done connection (Added in 7.29.0)
scheme
The URL scheme (sometimes called protocol) that was effectively used (Added in 7.52.0)
size_download
The total amount of bytes that were downloaded.
size_header
The total amount of bytes of the downloaded headers.
size_request
The total amount of bytes that were sent in the HTTP request.
size_upload
The total amount of bytes that were uploaded.
speed_download
The average download speed that curl measured for the complete download. Bytes per second.
speed_upload
The average upload speed that curl measured for the complete upload. Bytes per second.
ssl_verify_result
The result of the SSL peer certificate verification that was requested. 0 means the verification was successful. (Added in 7.19.0)
time_appconnect
The time, in seconds, it took from the start until the SSL/SSH/etc connect/handshake to the remote host was completed. (Added in 7.19.0)
time_connect
The time, in seconds, it took from the start until the TCP connect to the remote host (or proxy) was completed.
time_namelookup
The time, in seconds, it took from the start until the name resolving was completed.
time_pretransfer
The time, in seconds, it took from the start until the file transfer was just about to begin. This includes all pre-transfer commands and negotiations that are specific to the particular protocol(s) involved.
time_redirect
The time, in seconds, it took for all redirection steps including name lookup, connect, pretransfer and transfer before the final transaction was started. time_redirect shows the complete execution time for multiple redirections. (Added in 7.12.3)
time_starttransfer
The time, in seconds, it took from the start until the first byte was just about to be transferred. This includes time_pretransfer and also the time the server needed to calculate the result.
time_total
The total time, in seconds, that the full operation lasted.
url_effective
The URL that was fetched last. This is most meaningful if you've told curl to follow location

Python : How to run a function "foo" per second and last a few minutes or hours

Scenario

I tried to run a function "foo" every second. I have to do this for a few minutes (say 5).

The function foo () sends 100 HTTP requests (including JSON objects) to the server and prints the JSON response.

In short, I have to issue 100 HTTP requests per second for 5 minutes.

Using threading.Timer

 #!/usr/bin/python import time import thread import threading  def foo():     print time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time())), threading.active_count()  #5 minutes = 5 * 60 = 300 seconds for x in range(0, 300):     t = threading.Timer(x + 1, foo)     t.start()

Expected output

function foo was executed per second and last about 5 minutes

2020-05-14 00:54:49 301 2020-05-14 00:54:50 300 2020-05-14 00:54:51 299 2020-05-14 00:54:52 298 2020-05-14 00:54:53 297 2020-05-14 00:54:54 296 2020-05-14 00:54:55 295 ....... 2020-05-14 00:59:44 6 2020-05-14 00:59:45 5 2020-05-14 00:59:46 4 2020-05-14 00:59:47 3 2020-05-14 00:59:48 2

San Song Daddy :)