Instalation

browsesync is based on node/js platform so npm install -g browser-sync

Default running

browser-sync start --server

in my case to go fast i got an alias in my bashrc

alias bserve='browser-sync start --server' then to run for me is

$ bserve --file * -w

GIT most used comands

GIT log and info

set alias into .bashrc vimlog

alias gitlog='git log --all --oneline --graph'

to see diferences betwen branches write .. betwen branches

git diff branch_a..branch_b

GIT Commit

when I sure git commit -m -a "message" when not it allows check the diferences git add -p

GIT branch

create a branch called features git checkout -b features merge into branch into master git checkout master to go to master and the git merge features. if there is confilcs resolve or file to file editing one by one or use git mergetool it opens a nice tool based in vimlo git checkout --theirs or git checkout --ours in case you wan take iether feture or master

GIT rebase

Use rebase when you want get all the master o shared repo to you personal branch

Testing With Gradle

Gradle has Junit out of the box, the reporting is not still so fancy as maven but it has the same functionality

Gradle JUnit 5

testCompile('org.junit.jupiter:junit-jupiter-api:5.2.0')
testCompile('org.junit.jupiter:junit-jupiter-params:5.2.0')
testRuntime('org.junit.jupiter:junit-jupiter-engine:5.2.0')

to run the test just execute gradle test but if you wish and specific test ie the whole class is still posssible with gradle test --tests org.jordiesc.BlogTest

Update Ubuntu certificates

• create a directory into /usr/local/share/ca-certificates mkdir new directory

• copy the certificate directory file *.crt give permsissions and chmod 644 for the files

• sudo update-ca-certificates

Get the certificates chain from the server

openssl s_client -connect HOST:PORTNUMBER -showcerts save the files as crt.

Threading in Python

Very very similar to Java but with less code. 

import threading

import datetime

import time

DELAY = 10

def hacertrabajo():

timeinit = datetime.datetime.now()

print("se inicia "+str(timeinit))

time.sleep(10)

print("se finaliza "+ str(datetime.datetime.now()) + "en "+str(datetime.datetime.now()-timeinit))

th1 = threading.Thread(target=hacertrabajo,name="th-1")

th2 = threading.Thread(target=hacertrabajo,name="th-2")

th1.start()

th2.start()

print("no se espera")

if you execute the prgoram you will see that the output "no se espear" is writtein even without having finisthed both threads.

PS C:\Users\jordi\Documents\python\multithread> python multi.py
se inicia 2018-02-26 22:02:26.326352
start th1
se inicia 2018-02-26 22:02:26.328306
start th2
no se espera
se finaliza 2018-02-26 22:02:36.328301en 0:00:10.001949
se finaliza 2018-02-26 22:02:36.330257en 0:00:10.001951

to wait implement the call join(seconds) where seconds are the timeout , the time point the time when the control will arive to point join

import threading

import datetime

import time

DELAY = 10

def hacertrabajo():

timeinit = datetime.datetime.now()

print("se inicia "+str(timeinit))

time.sleep(10)

print("se finaliza "+ str(datetime.datetime.now()) + "en "+str(datetime.datetime.now()-timeinit))

th1 = threading.Thread(target=hacertrabajo,name="th-1")

th2 = threading.Thread(target=hacertrabajo,name="th-2")

th1.start()

th2.start()

timeinit = datetime.datetime.now()

th1.join(5)

print("se finaliza th1 "+ str(datetime.datetime.now()) + "en "+str(datetime.datetime.now()-timeinit))

th2.join(11)

print("se finaliza th2"+ str(datetime.datetime.now()) + "en "+str(datetime.datetime.now()-timeinit))

Da el resultado siguiente.

PS C:\Users\jordi\Documents\python\multithread> python multi.py
se inicia 2018-02-26 22:22:31.651966
se inicia 2018-02-26 22:22:31.652945
se finaliza th1 2018-02-26 22:22:36.653236en 0:00:05.000291
se finaliza 2018-02-26 22:22:41.653288en 0:00:10.001322
se finaliza 2018-02-26 22:22:41.654265en 0:00:10.001320
se finaliza th22018-02-26 22:22:41.655247en 0:00:10.002302
PS C:\Users\jordi\Documents\python\multithread>

Tal y como indica la documentacion lo normal de join() seria despues hacer algo con el thread como

PlyGround with Python 1

how easy is python and sqlite3

import sqlite3

import datetime

def createDataBase():

conn = sqlite3.connect('control.db')

c = conn.cursor()

c.execute('create table control( nombre TEXT, fechaini timestamp, fechafin timestamp)')

c.close()

def pupulateDataBase():

conn = sqlite3.connect('control.db')

c = conn.cursor()

c.execute('insert into control values (?,?,?)',('registro 1',datetime.datetime.now(),datetime.datetime.now()))

conn.commit()

conn.close()

def pupulateDataBaseWhitNull():

conn = sqlite3.connect('control.db')

c = conn.cursor()

c.execute('insert into control values (?,?,?)',('registro 1',datetime.datetime.now(),None))

conn.commit()

conn.close()

def fetchDataBase():

conn = sqlite3.connect('control.db')

c = conn.cursor()

for row in c.execute('SELECT * FROM control'):

print(row)

createDataBase()

pupulateDataBase()

pupulateDataBaseWhitNull()

fetchDataBase()

(test) C:\Users\jordi\jordi\workspaces\python\test>python testsqlite.py
('registro 1', '2018-02-17 10:48:47.235088', '2018-02-17 10:48:47.235088')
('registro 1', '2018-02-17 10:48:47.354523', None)

LightWeight Python Envirotment with Visual Studio 

Create a virtualenv with virtualenv and later activate it running the activate script.

Open the VSC and creaate a fill called .env with the variable PYTHONPATH pointing to the site-packages where the virualenv located all the libraries already download by PIP.

PYTHONPATH=C:\Users\jordi\jordi\workspaces\python\test\Lib\site-packages

Little’s law

number of threads = (Requests/sec) X (ResponseTime in secs)

ssh keys

From my laptop I will create the keys and I will expose this key to the server I want to connect using keys. Additionally we get rid of passwords , even for my user as sudo user.

jordi@LAPTOP-ELFAQNCG MINGW64 ~/.ssh

$ ssh-keygen -t rsa

Generating public/private rsa key pair.

Enter file in which to save the key (/c/Users/jordi/.ssh/id_rsa):

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /c/Users/jordi/.ssh/id_rsa.

Your public key has been saved in /c/Users/jordi/.ssh/id_rsa.pub.

The key fingerprint is:

SHA256:ljvEge2a/MwKp8OK73ai27v7zRFiPyPmMxJCpw0nJLU jordi@LAPTOP-ELFAQNCG

The key's randomart image is:

+---[RSA 2048]----+

| ..              |

|.. .   o         |

|o E   . o        |

| + o   o o       |

|. B o . S        |

|...o + * .       |

| . o+ X o        |

| o+o*B B .       |

|+*OX+++.+        |

+----[SHA256]-----+

jordi@LAPTOP-ELFAQNCG MINGW64 ~/.ssh

$ ssh-copy-id jordi@localhost

/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/c/Users/jordi/.ssh/id_rsa.pub"

/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed

/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys

no such identity: /c/Users/jordi/.ssh/keys/id_rsa.pub: No such file or directory

jordi@localhost's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'jordi@localhost'"

and check to make sure that only the key(s) you wanted were added

jordi@LAPTOP-ELFAQNCG MINGW64 ~/.ssh

$ cat config

Host localhost

 Hostname localhost

 IdentityFile ~/.ssh/id_rsa

.

jordi@LAPTOP-ELFAQNCG MINGW64 ~/.ssh

$ ssh localhost

Last login: Sat Feb  3 17:27:47 2018 from gateway

[jordi@localhost ~]$

At centos to avoid password for instance to avoid pas to do sudo

/etc/ssh/sshd_config

PasswordAuthentication no

addl to the bototn

 sudo visudo

jordi ALL=(ALL) NOPASSWD: ALL

RAD in java

Some tools to rapidly create a java/groovy application  or RAD applications 

Jeddict

Grails

Spring Roo

JHipster