Show HN: Golang AMQP Fluent Interface
Fluent AMQP
Library that provides fluent and easy wrapper over streadway-amqp API. Adds such features like:
- Reconnectiong. Will restore all defined infrastructure
- Non-blocking processing of messages
- Optional auto-requeue (with delay)
- Signing and verifiying messages by public/private pair
Signing and verification
Hash algorithm (x509) SHA512 with RSA, sign - SHA512.
The signer (producer) should use private key to sign content of message body and message id.
The validator (consumer) should use public certificate to validate content of message and message id against signature and should drops invalid or duplicated messages.
The sign should be put to a header (X-Signature by default: see DefaultSignatureHeader constant in godoc) as binary object (not hex or base64 encoded).
DATA = BYTES(ID) ... BYTES(BODY) # SIGN via PKCS#1 v1.5 SIGN_HEADER_BODY = SIGN_SHA512(PRIVATE_KEY, DATA) Default message
Message by default has:
- Delivery type - persistent
- Time - current time in UTC
Templates
amqp-recv supports templating output -o template. Template content read from STDIN.
Root template object is a amqp.Delivery with functions from Sprig plus additional methods like:
asText- converts bytes to string
- Basic example:
Print same as -o plain.
echo '' | amqp-recv -o template ... - Notification to telegram
Use combination of basic CLI utils and templates.
TOKEN="xxxyyyy" # BotFather token for Telegram (see here: https://t.me/BotFather) CHAT_ID="1234567" # Target Telegram chat ID (find yours: https://t.me/MyTelegramID_bot) QUEUE="notification" # queue name should be defined if persistent required EXCHANGE="amqp.topic" # source of notification TYPE="topic" # exchange type TOPIC="#" # specify subject that will be sent over telegram (# - everything) while true; do echo -n -e 'Subject: \n\n' | amqp-recv -o template -Q $QUEUE -e $EXCHANGE -k $TYPE "$TOPIC" > message.txt curl -f -X POST --data "text=$(cat message.txt)" --data "chat_id=${CHAT_ID}" "https://api.telegram.org/bot${TOKEN}/sendMessage" || exit 1 done
Command line utilities
- amqp-exec - CGI like daemon to listen message and run executable (and send reply)
- amqp-recv - Receive message from AMQP (like
catcommand) - amqp-send - Send message to AMQP (like
wallcommand)
Installation
from Hacker News https://ift.tt/36AHF3N