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metric l_rgw_pubsub_push_pending

in http, it's implemented here

with amqp

check function send

• case ack_level == ack_level_t::None -> increase then decrease
• case y, increase before line amqp::publish_with_confirm (L216), decrease after check rc < 0
• case y false, increase before amqp::publish_with_confirm (L228), decrease after amqp::publish_with_confirm (???)

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hello world

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import socket
from redis.client import Redis
from redis.connection import Connection, ConnectionPool
from redis._compat import iteritems


class ProxyConnection(Connection):
    def __init__(self, host='localhost', port=6379, db=0, password=None,
                 socket_timeout=None, socket_connect_timeout=None,
                 socket_keepalive=False, socket_keepalive_options=None,

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• Make an install directory somewhere convenient and switch to it

mkdir -p ~/.local/share/authy
cd ~/.local/share/authy

• Fetch the current Authy snap

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from cryptography import x509
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.x509.oid import NameOID
import datetime
import uuid
one_day = datetime.timedelta(1, 0, 0)
private_key = rsa.generate_private_key(
    public_exponent=65537,

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Smart Caps Lock: Remap to Control AND Escape (Linux, Mac, Windows)

把 Caps Lock 變成智慧的 Control 以及 Escape ：

• 單獨輕按一下就是 Escape 。
• 若按下時同時按著其他鍵，就會是 Control 。

這應該是 Vim 和 Emacs 的最佳解了！(Emacs? Bash 的快捷鍵就是 Emacs 系列的)

• Send Escape if you tap Caps Lock alone.

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Ubuntu Common Packages

$ sudo apt update
$ sudo apt upgrade
$ sudo apt install -y  git build-essential \
    tmux htop nload \
    sysstat iotop dstat \
    tcptraceroute net-tools wget \
 curl dnstop bash-completion \

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ssh-keygen -a 101 -t ed25519 -f ~/.ssh/id_ed25519 -C "[email protected]"

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How to setup Let's Encrypt for Nginx on Ubuntu 18.04 (including IPv6, HTTP/2 and A+ SLL rating)

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Virtual hosts

Let's say you want to host domains first.com and second.com.

Create folders for their files:

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[Desktop Entry]
Categories=Development;
Comment=Supercharge your API workflow
Exec="/home/hauthorn/Programs/Postman/Postman"
Icon=/home/hauthorn/Programs/Postman/app/resources/app/assets/icon.png
Name=Postman
Terminal=false
Type=Application
Version=1.0